From patchwork Thu Mar 23 17:21:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ye Xiang X-Patchwork-Id: 667087 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 13AF4C6FD1C for ; Thu, 23 Mar 2023 17:21:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231706AbjCWRVU (ORCPT ); Thu, 23 Mar 2023 13:21:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52764 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230498AbjCWRVT (ORCPT ); Thu, 23 Mar 2023 13:21:19 -0400 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 417422798D; Thu, 23 Mar 2023 10:21:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1679592076; x=1711128076; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=8PJQkWjd6bysvWhi0/7qCf/gddQZxemPfecDuH+awF0=; b=FKZfV8hsHOktrvqYnrsVmDFsLAGkD15PZFHxQGyeHXkdhrcdAC+iUfLu 7Zp1pG5Qts8zgEYfPuL5iIitZqtJ7vA7PU8j8dp7vvK3IqigwDsbUfk39 o+ZAbNBIs/k02OmwPLAnD7Ta+axEgCB9d2NFF77c2rTz9eTMom3uekq3y /mefdE0ifdG2ilAv2Qq7ppsTSdqTVni1WwqHqKDyH9oLarqgT5jtYJCDT JoOdskJAX9o/v8eQjuCIkQ34khjsVg/BYdqBFHlbfyKKBsRuEAz+qY89C pwVh21g2mabjAgh2uHJwCOvVuZP+//XQ6ABNtIJlMs7OToIYVTdsASGNf g==; X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="425840183" X-IronPort-AV: E=Sophos;i="5.98,285,1673942400"; d="scan'208";a="425840183" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Mar 2023 10:21:15 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="712748282" X-IronPort-AV: E=Sophos;i="5.98,285,1673942400"; d="scan'208";a="712748282" Received: from ye-nuc7i7dnhe.sh.intel.com ([10.239.154.52]) by orsmga008.jf.intel.com with ESMTP; 23 Mar 2023 10:21:09 -0700 From: Ye Xiang To: Greg Kroah-Hartman , Arnd Bergmann , Matthias Kaehlcke , Lee Jones , Wolfram Sang , Tyrone Ting , Mark Brown , Linus Walleij , Bartosz Golaszewski , linux-usb@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-gpio@vger.kernel.org Cc: srinivas.pandruvada@intel.com, heikki.krogerus@linux.intel.com, andriy.shevchenko@linux.intel.com, sakari.ailus@linux.intel.com, zhifeng.wang@intel.com, wentong.wu@intel.com, lixu.zhang@intel.com, Ye Xiang Subject: [PATCH v6 1/6] usb: Add support for Intel LJCA device Date: Fri, 24 Mar 2023 01:21:08 +0800 Message-Id: <20230323172113.1231050-2-xiang.ye@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230323172113.1231050-1-xiang.ye@intel.com> References: <20230323172113.1231050-1-xiang.ye@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org This patch implements the USB part of Intel USB-I2C/GPIO/SPI adapter device named "La Jolla Cove Adapter" (LJCA). The communication between the various LJCA module drivers and the hardware will be muxed/demuxed by this driver. Three modules ( I2C, GPIO, and SPI) are supported currently. Each sub-module of LJCA device is identified by type field within the LJCA message header. The minimum code in ASL that covers this board is Scope (\_SB.PCI0.DWC3.RHUB.HS01) { Device (GPIO) { Name (_ADR, Zero) Name (_STA, 0x0F) } Device (I2C) { Name (_ADR, One) Name (_STA, 0x0F) } Device (SPI) { Name (_ADR, 0x02) Name (_STA, 0x0F) } } Signed-off-by: Ye Xiang --- drivers/usb/misc/Kconfig | 13 + drivers/usb/misc/Makefile | 1 + drivers/usb/misc/ljca.c | 965 ++++++++++++++++++++++++++++++++++++++ include/linux/usb/ljca.h | 29 ++ 4 files changed, 1008 insertions(+) create mode 100644 drivers/usb/misc/ljca.c create mode 100644 include/linux/usb/ljca.h diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig index a5f7652db7da..74ee39d02e69 100644 --- a/drivers/usb/misc/Kconfig +++ b/drivers/usb/misc/Kconfig @@ -273,6 +273,19 @@ config USB_LINK_LAYER_TEST Layer Test Device. Say Y only when you want to conduct USB Super Speed Link Layer Test for host controllers. +config USB_LJCA + tristate "Intel La Jolla Cove Adapter support" + select AUXILIARY_BUS + depends on USB + help + This adds support for Intel La Jolla Cove USB-I2C/SPI/GPIO + Master Adapter (LJCA). Additional drivers such as I2C_LJCA, + GPIO_LJCA and SPI_LJCA must be enabled in order to use the + functionality of the device. + + This driver can also be built as a module. If so, the module + will be called ljca. + config USB_CHAOSKEY tristate "ChaosKey random number generator driver support" depends on HW_RANDOM diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile index 93581baec3a8..6f6adfbe17e0 100644 --- a/drivers/usb/misc/Makefile +++ b/drivers/usb/misc/Makefile @@ -29,6 +29,7 @@ obj-$(CONFIG_USB_HUB_USB251XB) += usb251xb.o obj-$(CONFIG_USB_HSIC_USB3503) += usb3503.o obj-$(CONFIG_USB_HSIC_USB4604) += usb4604.o obj-$(CONFIG_USB_CHAOSKEY) += chaoskey.o +obj-$(CONFIG_USB_LJCA) += ljca.o obj-$(CONFIG_USB_SISUSBVGA) += sisusbvga/ obj-$(CONFIG_USB_LINK_LAYER_TEST) += lvstest.o diff --git a/drivers/usb/misc/ljca.c b/drivers/usb/misc/ljca.c new file mode 100644 index 000000000000..3e4f85f453dd --- /dev/null +++ b/drivers/usb/misc/ljca.c @@ -0,0 +1,965 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Intel La Jolla Cove Adapter USB driver + * + * Copyright (c) 2023, Intel Corporation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +enum ljca_acpi_match_adr { + LJCA_ACPI_MATCH_GPIO, + LJCA_ACPI_MATCH_I2C1, + LJCA_ACPI_MATCH_I2C2, + LJCA_ACPI_MATCH_SPI1, + LJCA_ACPI_MATCH_SPI2, + LJCA_ACPI_MATCH_MAX, +}; + +struct ljca_msg { + u8 type; + u8 cmd; + u8 flags; + u8 len; + u8 data[]; +} __packed; + +struct fw_version { + u8 major; + u8 minor; + __le16 patch; + __le16 build; +} __packed; + +/** + * enum ljca_stub_type - Stub type supported by LJCA. + * @LJCA_MNG_STUB: Provides Management messages. + * @LJCA_DIAG_STUB: provides Diagnose messages. + * @LJCA_GPIO_STUB: provides GPIO functionality. + * @LJCA_I2C_STUB: provides I2C functionality. + * @LJCA_SPI_STUB: provides SPI functionality. + */ +enum ljca_stub_type { + LJCA_MNG_STUB = 1, + LJCA_DIAG_STUB, + LJCA_GPIO_STUB, + LJCA_I2C_STUB, + LJCA_SPI_STUB, +}; + +/* command Flags */ +#define LJCA_ACK_FLAG BIT(0) +#define LJCA_RESP_FLAG BIT(1) +#define LJCA_CMPL_FLAG BIT(2) + +/* MNG stub commands */ +enum ljca_mng_cmd { + LJCA_MNG_GET_VERSION = 1, + LJCA_MNG_RESET_NOTIFY, + LJCA_MNG_RESET, + LJCA_MNG_ENUM_GPIO, + LJCA_MNG_ENUM_I2C, + LJCA_MNG_POWER_STATE_CHANGE, + LJCA_MNG_SET_DFU_MODE, + LJCA_MNG_ENUM_SPI, +}; + +/* DIAG commands */ +enum ljca_diag_cmd { + LJCA_DIAG_GET_STATE = 1, + LJCA_DIAG_GET_STATISTIC, + LJCA_DIAG_SET_TRACE_LEVEL, + LJCA_DIAG_SET_ECHO_MODE, + LJCA_DIAG_GET_FW_LOG, + LJCA_DIAG_GET_FW_COREDUMP, + LJCA_DIAG_TRIGGER_WDT, + LJCA_DIAG_TRIGGER_FAULT, + LJCA_DIAG_FEED_WDT, + LJCA_DIAG_GET_SECURE_STATE, +}; + +struct ljca_i2c_ctr_info { + u8 id; + u8 capacity; + u8 intr_pin; +} __packed; + +struct ljca_i2c_descriptor { + u8 num; + struct ljca_i2c_ctr_info info[]; +} __packed; + +struct ljca_spi_ctr_info { + u8 id; + u8 capacity; +} __packed; + +struct ljca_spi_descriptor { + u8 num; + struct ljca_spi_ctr_info info[]; +} __packed; + +struct ljca_bank_descriptor { + u8 bank_id; + u8 pin_num; + + /* 1 bit for each gpio, 1 means valid */ + u32 valid_pins; +} __packed; + +struct ljca_gpio_descriptor { + u8 pins_per_bank; + u8 bank_num; + struct ljca_bank_descriptor bank_desc[]; +} __packed; + +#define LJCA_MAX_PACKET_SIZE 64 +#define LJCA_MAX_PAYLOAD_SIZE (LJCA_MAX_PACKET_SIZE - sizeof(struct ljca_msg)) +#define LJCA_USB_WRITE_TIMEOUT_MS 200 +#define LJCA_USB_WRITE_ACK_TIMEOUT_MS 500 +#define LJCA_USB_ENUM_STUB_TIMEOUT_MS 20 + +struct ljca_event_cb_entry { + ljca_event_cb_t notify; + void *context; +}; + +struct ljca_dev { + struct usb_device *udev; + struct usb_interface *intf; + u8 in_ep; /* the address of the bulk in endpoint */ + u8 out_ep; /* the address of the bulk out endpoint */ + + /* the urb/buffer for read */ + struct urb *in_urb; + unsigned char *ibuf; + size_t ibuf_len; + + /* mutex to protect all fields in this structure */ + struct mutex mutex; + bool started; + struct list_head stubs_list; + + /* to wait for an ongoing write ack */ + wait_queue_head_t ack_wq; + + struct auxiliary_device auxdevs[LJCA_ACPI_MATCH_MAX]; + int auxdev_count; +}; + +struct ljca { + u8 type; + struct ljca_dev *dev; +}; + +struct ljca_stub_packet { + unsigned int *ibuf_len; + u8 *ibuf; +}; + +struct ljca_stub { + struct list_head list; + struct usb_interface *intf; + struct ljca_stub_packet ipacket; + u8 type; + + /* for identify ack */ + bool acked; + int cur_cmd; + + struct ljca_event_cb_entry event_entry; + /* lock to protect event_entry */ + spinlock_t event_cb_lock; + + struct ljca ljca; + unsigned long priv[]; +}; + +static inline void *ljca_priv(struct ljca_stub *stub) +{ + return stub->priv; +} + +static bool ljca_validate(struct ljca_msg *header, u32 data_len) +{ + return header->len + sizeof(*header) == data_len; +} + +static struct ljca_stub *ljca_stub_alloc(struct ljca_dev *dev, u8 type, int priv_size) +{ + struct ljca_stub *stub; + + stub = kzalloc(struct_size(stub, priv, priv_size), GFP_KERNEL); + if (!stub) + return ERR_PTR(-ENOMEM); + + stub->type = type; + stub->intf = usb_get_intf(dev->intf); + stub->ljca.dev = dev; + stub->ljca.type = stub->type; + spin_lock_init(&stub->event_cb_lock); + list_add_tail(&stub->list, &dev->stubs_list); + + return stub; +} + +static void ljca_stub_destroy(struct ljca_stub *stub) +{ + usb_put_intf(stub->intf); + list_del_init(&stub->list); + kfree(stub); +} + +static void ljca_stub_cleanup(struct ljca_dev *dev) +{ + struct ljca_stub *stub, *next; + + list_for_each_entry_safe(stub, next, &dev->stubs_list, list) { + ljca_stub_destroy(stub); + } +} + +static struct ljca_stub *ljca_stub_find(struct ljca_dev *dev, u8 type) +{ + struct ljca_stub *stub; + + list_for_each_entry(stub, &dev->stubs_list, list) { + if (stub->type == type) + return stub; + } + + dev_err(&dev->intf->dev, "USB stub not found, type:%d\n", type); + + return ERR_PTR(-ENODEV); +} + +static void ljca_stub_notify(struct ljca_stub *stub, u8 cmd, const void *evt_data, int len) +{ + unsigned long flags; + + spin_lock_irqsave(&stub->event_cb_lock, flags); + if (stub->event_entry.notify && stub->event_entry.context) + stub->event_entry.notify(stub->event_entry.context, cmd, evt_data, len); + spin_unlock_irqrestore(&stub->event_cb_lock, flags); +} + +static int ljca_parse(struct ljca_dev *dev, struct ljca_msg *header) +{ + struct ljca_stub *stub; + + stub = ljca_stub_find(dev, header->type); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + if (!(header->flags & LJCA_ACK_FLAG)) { + ljca_stub_notify(stub, header->cmd, header->data, header->len); + return 0; + } + + if (stub->cur_cmd != header->cmd) { + dev_err(&dev->intf->dev, "header and stub current command mismatch (%x vs %x)\n", + header->cmd, stub->cur_cmd); + return -EINVAL; + } + + if (stub->ipacket.ibuf && stub->ipacket.ibuf_len) { + unsigned int newlen; + + newlen = min_t(unsigned int, header->len, *stub->ipacket.ibuf_len); + + *stub->ipacket.ibuf_len = newlen; + memcpy(stub->ipacket.ibuf, header->data, newlen); + } + + stub->acked = true; + wake_up(&dev->ack_wq); + + return 0; +} + +static int ljca_stub_write(struct ljca_stub *stub, u8 cmd, const void *obuf, unsigned int obuf_len, + void *ibuf, unsigned int *ibuf_len, bool wait_ack, unsigned long timeout) +{ + struct ljca_dev *dev = usb_get_intfdata(stub->intf); + u8 flags = LJCA_CMPL_FLAG; + struct ljca_msg *header; + unsigned int msg_len = sizeof(*header) + obuf_len; + int actual; + int ret; + + if (msg_len > LJCA_MAX_PACKET_SIZE) + return -EINVAL; + + if (wait_ack) + flags |= LJCA_ACK_FLAG; + + header = kmalloc(msg_len, GFP_KERNEL); + if (!header) + return -ENOMEM; + + header->type = stub->type; + header->cmd = cmd; + header->flags = flags; + header->len = obuf_len; + + if (obuf) + memcpy(header->data, obuf, obuf_len); + + dev_dbg(&dev->intf->dev, "send: type:%d cmd:%d flags:%d len:%d\n", header->type, + header->cmd, header->flags, header->len); + + usb_autopm_get_interface(dev->intf); + if (!dev->started) { + kfree(header); + ret = -ENODEV; + goto error_put; + } + + mutex_lock(&dev->mutex); + stub->cur_cmd = cmd; + stub->ipacket.ibuf = ibuf; + stub->ipacket.ibuf_len = ibuf_len; + stub->acked = false; + ret = usb_bulk_msg(interface_to_usbdev(dev->intf), + usb_sndbulkpipe(interface_to_usbdev(dev->intf), dev->out_ep), header, + msg_len, &actual, LJCA_USB_WRITE_TIMEOUT_MS); + kfree(header); + if (ret) { + dev_err(&dev->intf->dev, "bridge write failed ret:%d\n", ret); + goto error_unlock; + } + + if (actual != msg_len) { + dev_err(&dev->intf->dev, "bridge write length mismatch (%d vs %d)\n", msg_len, + actual); + ret = -EINVAL; + goto error_unlock; + } + + if (wait_ack) { + ret = wait_event_timeout(dev->ack_wq, stub->acked, msecs_to_jiffies(timeout)); + if (!ret) { + dev_err(&dev->intf->dev, "acked wait timeout\n"); + ret = -ETIMEDOUT; + goto error_unlock; + } + } + + ret = 0; +error_unlock: + stub->ipacket.ibuf = NULL; + stub->ipacket.ibuf_len = NULL; + mutex_unlock(&dev->mutex); +error_put: + usb_autopm_put_interface(dev->intf); + + return ret; +} + +static int ljca_transfer_internal(struct ljca *ljca, u8 cmd, const void *obuf, + unsigned int obuf_len, void *ibuf, unsigned int *ibuf_len, + bool wait_ack) +{ + struct ljca_stub *stub; + + stub = ljca_stub_find(ljca->dev, ljca->type); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + return ljca_stub_write(stub, cmd, obuf, obuf_len, ibuf, ibuf_len, wait_ack, + LJCA_USB_WRITE_ACK_TIMEOUT_MS); +} + +static void ljca_read_complete(struct urb *urb) +{ + struct ljca_msg *header = urb->transfer_buffer; + struct ljca_dev *dev = urb->context; + int len = urb->actual_length; + int ret; + + WARN_ON_ONCE(!dev); + WARN_ON_ONCE(!header); + + if (urb->status) { + /* sync/async unlink faults aren't errors */ + if (urb->status == -ENOENT || urb->status == -ECONNRESET || + urb->status == -ESHUTDOWN) + return; + + dev_err(&dev->intf->dev, "read bulk urb transfer failed: %d\n", urb->status); + goto resubmit; + } + + dev_dbg(&dev->intf->dev, "receive: type:%d cmd:%d flags:%d len:%d\n", header->type, + header->cmd, header->flags, header->len); + + if (!ljca_validate(header, len)) { + dev_err(&dev->intf->dev, "data not correct header->len:%d payload_len:%d\n ", + header->len, len); + goto resubmit; + } + + ret = ljca_parse(dev, header); + if (ret) + dev_err(&dev->intf->dev, "failed to parse data: ret:%d type:%d len:%d\n", ret, + header->type, header->len); + +resubmit: + ret = usb_submit_urb(urb, GFP_ATOMIC); + if (ret) + dev_err(&dev->intf->dev, "failed submitting read urb, error %d\n", ret); +} + +static int ljca_start(struct ljca_dev *dev) +{ + int ret; + + usb_fill_bulk_urb(dev->in_urb, interface_to_usbdev(dev->intf), + usb_rcvbulkpipe(interface_to_usbdev(dev->intf), dev->in_ep), dev->ibuf, + dev->ibuf_len, ljca_read_complete, dev); + + ret = usb_submit_urb(dev->in_urb, GFP_KERNEL); + if (ret) { + dev_err(&dev->intf->dev, "failed submitting read urb, error %d\n", ret); + return ret; + } + + mutex_lock(&dev->mutex); + dev->started = true; + mutex_unlock(&dev->mutex); + + return 0; +} + +struct ljca_mng_priv { + u32 reset_id; +}; + +static int ljca_mng_reset_handshake(struct ljca_stub *stub) +{ + struct ljca_mng_priv *priv; + __le32 reset_id; + __le32 reset_id_ret = 0; + unsigned int ilen = sizeof(__le32); + int ret; + + priv = ljca_priv(stub); + reset_id = cpu_to_le32(priv->reset_id++); + ret = ljca_stub_write(stub, LJCA_MNG_RESET_NOTIFY, &reset_id, sizeof(reset_id), + &reset_id_ret, &ilen, true, LJCA_USB_WRITE_ACK_TIMEOUT_MS); + if (ret) + return ret; + + if (ilen != sizeof(reset_id_ret) || reset_id_ret != reset_id) { + dev_err(&stub->intf->dev, "mng reset notify failed reset_id:%u/%u\n", + le32_to_cpu(reset_id_ret), le32_to_cpu(reset_id)); + return -EINVAL; + } + + return 0; +} + +static void ljca_aux_release(struct device *dev) {} + +static int ljca_add_aux_dev(struct ljca_dev *dev, char *name, unsigned int id, unsigned int adr, + void *data) +{ + struct auxiliary_device *auxdev; + struct acpi_device *parent; + struct acpi_device *adev = NULL; + int ret; + + if (dev->auxdev_count >= ARRAY_SIZE(dev->auxdevs)) + return -EINVAL; + + auxdev = &dev->auxdevs[dev->auxdev_count]; + auxdev->name = name; + auxdev->id = id; + auxdev->dev.platform_data = data; + auxdev->dev.parent = &dev->intf->dev; + auxdev->dev.release = ljca_aux_release; + + ret = auxiliary_device_init(auxdev); + if (ret) + return ret; + + /* new auxiliary device bind to acpi device */ + parent = ACPI_COMPANION(&dev->intf->dev); + adev = acpi_find_child_device(parent, adr, false); + ACPI_COMPANION_SET(&auxdev->dev, adev ?: parent); + + ret = auxiliary_device_add(auxdev); + if (ret) { + dev_err(&dev->intf->dev, "failed to add auxiliary dev %s.%d\n", name, id); + auxiliary_device_uninit(auxdev); + return ret; + } + + dev->auxdev_count++; + + return 0; +} + +static void ljca_cleanup_aux_dev(struct ljca_dev *dev) +{ + int i; + + for (i = 0; i < dev->auxdev_count; i++) { + auxiliary_device_delete(&dev->auxdevs[i]); + auxiliary_device_uninit(&dev->auxdevs[i]); + } +} + +static int ljca_gpio_stub_init(struct ljca_dev *dev, struct ljca_gpio_descriptor *desc) +{ + u32 valid_pin[LJCA_MAX_GPIO_NUM / BITS_PER_TYPE(u32)]; + struct ljca_gpio_info *gpio_info; + struct ljca_stub *stub; + int gpio_num; + int i; + int ret; + + gpio_num = desc->pins_per_bank * desc->bank_num; + if (gpio_num > LJCA_MAX_GPIO_NUM) + return -EINVAL; + + stub = ljca_stub_alloc(dev, LJCA_GPIO_STUB, sizeof(*gpio_info)); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + gpio_info = ljca_priv(stub); + gpio_info->ljca = &stub->ljca; + gpio_info->num = gpio_num; + + for (i = 0; i < desc->bank_num; i++) + valid_pin[i] = desc->bank_desc[i].valid_pins; + + bitmap_from_arr32(gpio_info->valid_pin_map, valid_pin, gpio_num); + + ret = ljca_add_aux_dev(dev, "ljca-gpio", 0, LJCA_ACPI_MATCH_GPIO, gpio_info); + if (ret) + ljca_stub_destroy(stub); + + return ret; +} + +static int ljca_mng_enum_gpio(struct ljca_stub *stub) +{ + struct ljca_dev *dev = usb_get_intfdata(stub->intf); + char buf[LJCA_MAX_PAYLOAD_SIZE]; + struct ljca_gpio_descriptor *desc; + unsigned int len = LJCA_MAX_PAYLOAD_SIZE; + int ret; + + ret = ljca_stub_write(stub, LJCA_MNG_ENUM_GPIO, NULL, 0, buf, &len, true, + LJCA_USB_ENUM_STUB_TIMEOUT_MS); + if (ret) + return ret; + + desc = (struct ljca_gpio_descriptor *)buf; + if (len != struct_size(desc, bank_desc, desc->bank_num)) { + dev_err(&stub->intf->dev, "GPIO enumeration failed, len:%u bank_num:%u\n", len, + desc->bank_num); + return -EINVAL; + } + + return ljca_gpio_stub_init(dev, desc); +} + +static int ljca_i2c_stub_init(struct ljca_dev *dev, struct ljca_i2c_descriptor *desc) +{ + struct ljca_i2c_info *i2c_info; + struct ljca_stub *stub; + int ret; + int i; + + stub = ljca_stub_alloc(dev, LJCA_I2C_STUB, size_mul(desc->num, sizeof(*i2c_info))); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + i2c_info = ljca_priv(stub); + + for (i = 0; i < desc->num; i++) { + i2c_info[i].ljca = &stub->ljca; + i2c_info[i].id = desc->info[i].id; + i2c_info[i].capacity = desc->info[i].capacity; + i2c_info[i].intr_pin = desc->info[i].intr_pin; + + ret = ljca_add_aux_dev(dev, "ljca-i2c", i, LJCA_ACPI_MATCH_I2C1 + i, + &i2c_info[i]); + if (ret) { + ljca_stub_destroy(stub); + return ret; + } + } + + return 0; +} + +static int ljca_mng_enum_i2c(struct ljca_stub *stub) +{ + struct ljca_dev *dev = usb_get_intfdata(stub->intf); + char buf[LJCA_MAX_PAYLOAD_SIZE]; + struct ljca_i2c_descriptor *desc; + unsigned int len = LJCA_MAX_PAYLOAD_SIZE; + int ret; + + ret = ljca_stub_write(stub, LJCA_MNG_ENUM_I2C, NULL, 0, buf, &len, true, + LJCA_USB_ENUM_STUB_TIMEOUT_MS); + if (ret) { + dev_err(&stub->intf->dev, "I2C enumeration failed, ret:%d len:%u\n", ret, len); + return ret; + } + + desc = (struct ljca_i2c_descriptor *)buf; + return ljca_i2c_stub_init(dev, desc); +} + +static int ljca_spi_stub_init(struct ljca_dev *dev, struct ljca_spi_descriptor *desc) +{ + struct ljca_spi_info *spi_info; + struct ljca_stub *stub; + int i; + int ret; + + stub = ljca_stub_alloc(dev, LJCA_SPI_STUB, size_mul(desc->num, sizeof(*spi_info))); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + spi_info = ljca_priv(stub); + for (i = 0; i < desc->num; i++) { + spi_info[i].ljca = &stub->ljca; + spi_info[i].id = desc->info[i].id; + spi_info[i].capacity = desc->info[i].capacity; + + ret = ljca_add_aux_dev(dev, "ljca-spi", i, LJCA_ACPI_MATCH_SPI1 + i, + &spi_info[i]); + if (ret) { + ljca_stub_destroy(stub); + return ret; + } + } + + return 0; +} + +static int ljca_mng_enum_spi(struct ljca_stub *stub) +{ + struct ljca_dev *dev = usb_get_intfdata(stub->intf); + char buf[LJCA_MAX_PAYLOAD_SIZE]; + struct ljca_spi_descriptor *desc; + unsigned int len = LJCA_MAX_PAYLOAD_SIZE; + int ret; + + ret = ljca_stub_write(stub, LJCA_MNG_ENUM_SPI, NULL, 0, buf, &len, true, + LJCA_USB_ENUM_STUB_TIMEOUT_MS); + if (ret) { + dev_err(&stub->intf->dev, "SPI enumeration failed, ret:%d len:%d\n", ret, len); + return ret; + } + + desc = (struct ljca_spi_descriptor *)buf; + return ljca_spi_stub_init(dev, desc); +} + +static int ljca_mng_get_version(struct ljca_stub *stub, char *buf) +{ + struct fw_version version = {}; + unsigned int len = sizeof(version); + int ret; + + ret = ljca_stub_write(stub, LJCA_MNG_GET_VERSION, NULL, 0, &version, &len, true, + LJCA_USB_WRITE_ACK_TIMEOUT_MS); + if (ret) + return ret; + + if (len != sizeof(version)) { + dev_err(&stub->intf->dev, "get version failed, len:%d\n", len); + return -EINVAL; + } + + return sysfs_emit(buf, "%d.%d.%d.%d\n", version.major, version.minor, + le16_to_cpu(version.patch), le16_to_cpu(version.build)); +} + +static inline int ljca_mng_set_dfu_mode(struct ljca_stub *stub) +{ + return ljca_stub_write(stub, LJCA_MNG_SET_DFU_MODE, NULL, 0, NULL, NULL, true, + LJCA_USB_WRITE_ACK_TIMEOUT_MS); +} + +static int ljca_mng_link(struct ljca_dev *dev, struct ljca_stub *stub) +{ + int ret; + + ret = ljca_mng_reset_handshake(stub); + if (ret) + return ret; + + /* try to enum all the stubs */ + ret = ljca_mng_enum_gpio(stub); + if (ret) + dev_warn(&dev->intf->dev, "GPIO function does not support yet\n"); + + ret = ljca_mng_enum_i2c(stub); + if (ret) + dev_warn(&dev->intf->dev, "I2C function does not support yet\n"); + + ret = ljca_mng_enum_spi(stub); + if (ret) + dev_warn(&dev->intf->dev, "SPI function does not support yet\n"); + + return 0; +} + +static int ljca_mng_init(struct ljca_dev *dev) +{ + struct ljca_stub *stub; + struct ljca_mng_priv *priv; + int ret; + + stub = ljca_stub_alloc(dev, LJCA_MNG_STUB, sizeof(*priv)); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + priv = ljca_priv(stub); + if (!priv) + return -ENOMEM; + + priv->reset_id = 0; + + ret = ljca_mng_link(dev, stub); + if (ret) + dev_err(&dev->intf->dev, "mng stub link failed, ret:%d\n", ret); + + return ret; +} + +static inline int ljca_diag_set_trace_level(struct ljca_stub *stub, u8 level) +{ + return ljca_stub_write(stub, LJCA_DIAG_SET_TRACE_LEVEL, &level, sizeof(level), NULL, NULL, + true, LJCA_USB_WRITE_ACK_TIMEOUT_MS); +} + +static int ljca_diag_init(struct ljca_dev *dev) +{ + struct ljca_stub *stub; + + stub = ljca_stub_alloc(dev, LJCA_DIAG_STUB, 0); + + return PTR_ERR_OR_ZERO(stub); +} + +static void ljca_delete(struct ljca_dev *dev) +{ + mutex_destroy(&dev->mutex); + usb_free_urb(dev->in_urb); + usb_put_intf(dev->intf); +} + +static int ljca_init(struct ljca_dev *dev) +{ + mutex_init(&dev->mutex); + init_waitqueue_head(&dev->ack_wq); + INIT_LIST_HEAD(&dev->stubs_list); + + return 0; +} + +static void ljca_stop(struct ljca_dev *dev) +{ + mutex_lock(&dev->mutex); + dev->started = false; + mutex_unlock(&dev->mutex); + usb_kill_urb(dev->in_urb); +} + +static ssize_t ljca_enable_dfu_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct usb_interface *intf = to_usb_interface(dev); + struct ljca_dev *ljca_dev = usb_get_intfdata(intf); + struct ljca_stub *mng_stub = ljca_stub_find(ljca_dev, LJCA_MNG_STUB); + bool enable; + int ret; + + ret = kstrtobool(buf, &enable); + if (ret) + return ret; + + if (enable) { + ret = ljca_mng_set_dfu_mode(mng_stub); + if (ret) + return ret; + } + + return count; +} +static DEVICE_ATTR_WO(ljca_enable_dfu); + +static ssize_t ljca_trace_level_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct usb_interface *intf = to_usb_interface(dev); + struct ljca_dev *ljca_dev = usb_get_intfdata(intf); + struct ljca_stub *diag_stub = ljca_stub_find(ljca_dev, LJCA_DIAG_STUB); + u8 level; + int ret; + + if (kstrtou8(buf, 0, &level)) + return -EINVAL; + + ret = ljca_diag_set_trace_level(diag_stub, level); + if (ret) + return ret; + + return count; +} +static DEVICE_ATTR_WO(ljca_trace_level); + +static ssize_t ljca_version_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct usb_interface *intf = to_usb_interface(dev); + struct ljca_dev *ljca_dev = usb_get_intfdata(intf); + struct ljca_stub *stub = ljca_stub_find(ljca_dev, LJCA_MNG_STUB); + + return ljca_mng_get_version(stub, buf); +} +static DEVICE_ATTR_RO(ljca_version); + +static struct attribute *ljca_attrs[] = { + &dev_attr_ljca_version.attr, + &dev_attr_ljca_enable_dfu.attr, + &dev_attr_ljca_trace_level.attr, + NULL +}; +ATTRIBUTE_GROUPS(ljca); + +static int ljca_probe(struct usb_interface *intf, const struct usb_device_id *id) +{ + struct ljca_dev *dev; + struct usb_endpoint_descriptor *bulk_in, *bulk_out; + int ret; + + /* allocate memory for our device state and initialize it */ + dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL); + if (!dev) + return -ENOMEM; + + ljca_init(dev); + dev->intf = usb_get_intf(intf); + + /* set up the endpoint information use only the first bulk-in and bulk-out endpoints */ + ret = usb_find_common_endpoints(intf->cur_altsetting, &bulk_in, &bulk_out, NULL, NULL); + if (ret) { + dev_err(&intf->dev, "could not find both bulk-in and bulk-out endpoints\n"); + goto error; + } + + dev->ibuf_len = usb_endpoint_maxp(bulk_in); + dev->in_ep = bulk_in->bEndpointAddress; + dev->ibuf = devm_kzalloc(&intf->dev, dev->ibuf_len, GFP_KERNEL); + if (!dev->ibuf) { + ret = -ENOMEM; + goto error; + } + + dev->in_urb = usb_alloc_urb(0, GFP_KERNEL); + if (!dev->in_urb) { + ret = -ENOMEM; + goto error; + } + + dev->out_ep = bulk_out->bEndpointAddress; + /* save our data pointer in this intf device */ + usb_set_intfdata(intf, dev); + ret = ljca_start(dev); + if (ret) { + dev_err(&intf->dev, "bridge read start failed ret %d\n", ret); + goto error; + } + + ret = ljca_mng_init(dev); + if (ret) { + dev_err(&intf->dev, "register mng stub failed ret %d\n", ret); + goto error_stop; + } + + ret = ljca_diag_init(dev); + if (ret) { + dev_err(&intf->dev, "register diag stub failed ret %d\n", ret); + goto error_stop; + } + + usb_enable_autosuspend(interface_to_usbdev(dev->intf)); + return 0; +error_stop: + ljca_stop(dev); + ljca_cleanup_aux_dev(dev); + ljca_stub_cleanup(dev); +error: + dev_err(&intf->dev, "LJCA USB device init failed\n"); + ljca_delete(dev); + + return ret; +} + +static void ljca_disconnect(struct usb_interface *intf) +{ + struct ljca_dev *dev = usb_get_intfdata(intf); + + ljca_stop(dev); + ljca_cleanup_aux_dev(dev); + ljca_stub_cleanup(dev); + ljca_delete(dev); +} + +static int ljca_suspend(struct usb_interface *intf, pm_message_t message) +{ + struct ljca_dev *dev = usb_get_intfdata(intf); + + ljca_stop(dev); + + return 0; +} + +static int ljca_resume(struct usb_interface *intf) +{ + struct ljca_dev *dev = usb_get_intfdata(intf); + + return ljca_start(dev); +} + +static const struct usb_device_id ljca_table[] = { + {USB_DEVICE(0x8086, 0x0b63)}, + {} +}; +MODULE_DEVICE_TABLE(usb, ljca_table); + +static struct usb_driver ljca_driver = { + .name = "ljca", + .probe = ljca_probe, + .disconnect = ljca_disconnect, + .suspend = ljca_suspend, + .resume = ljca_resume, + .id_table = ljca_table, + .dev_groups = ljca_groups, + .supports_autosuspend = 1, +}; +module_usb_driver(ljca_driver); + +MODULE_AUTHOR("Ye Xiang "); +MODULE_AUTHOR("Wang Zhifeng "); +MODULE_AUTHOR("Zhang Lixu "); +MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/usb/ljca.h b/include/linux/usb/ljca.h new file mode 100644 index 000000000000..057f18c5b17a --- /dev/null +++ b/include/linux/usb/ljca.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef _LINUX_USB_LJCA_H_ +#define _LINUX_USB_LJCA_H_ + +#include + +struct ljca; + +#define LJCA_MAX_GPIO_NUM 64 +struct ljca_gpio_info { + struct ljca *ljca; + unsigned int num; + DECLARE_BITMAP(valid_pin_map, LJCA_MAX_GPIO_NUM); +}; + +struct ljca_i2c_info { + struct ljca *ljca; + u8 id; + u8 capacity; + u8 intr_pin; +}; + +struct ljca_spi_info { + struct ljca *ljca; + u8 id; + u8 capacity; +}; + +#endif From patchwork Thu Mar 23 17:21:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ye Xiang X-Patchwork-Id: 666375 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 30F48C761AF for ; Thu, 23 Mar 2023 17:21:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231797AbjCWRVd (ORCPT ); Thu, 23 Mar 2023 13:21:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53212 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231756AbjCWRV3 (ORCPT ); Thu, 23 Mar 2023 13:21:29 -0400 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A088B2914B; 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a="712748291" X-IronPort-AV: E=Sophos;i="5.98,285,1673942400"; d="scan'208";a="712748291" Received: from ye-nuc7i7dnhe.sh.intel.com ([10.239.154.52]) by orsmga008.jf.intel.com with ESMTP; 23 Mar 2023 10:21:16 -0700 From: Ye Xiang To: Greg Kroah-Hartman , Arnd Bergmann , Matthias Kaehlcke , Lee Jones , Wolfram Sang , Tyrone Ting , Mark Brown , Linus Walleij , Bartosz Golaszewski , linux-usb@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-gpio@vger.kernel.org Cc: srinivas.pandruvada@intel.com, heikki.krogerus@linux.intel.com, andriy.shevchenko@linux.intel.com, sakari.ailus@linux.intel.com, zhifeng.wang@intel.com, wentong.wu@intel.com, lixu.zhang@intel.com, Ye Xiang Subject: [PATCH v6 2/6] usb: ljca: Add transport interfaces for sub-module drivers Date: Fri, 24 Mar 2023 01:21:09 +0800 Message-Id: <20230323172113.1231050-3-xiang.ye@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230323172113.1231050-1-xiang.ye@intel.com> References: <20230323172113.1231050-1-xiang.ye@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org This patch adds the transport interfaces for various LJCA sub-module drivers to communicate with LJCA hardware. The sub-module of LJCA can use ljca_transfer() to issue a transfer between host and hardware. And ljca_register_event_cb is exported to LJCA sub-module drivers for hardware event subscription. Signed-off-by: Ye Xiang --- drivers/usb/misc/ljca.c | 47 ++++++++++++++++++++++++++++ include/linux/usb/ljca.h | 66 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 113 insertions(+) diff --git a/drivers/usb/misc/ljca.c b/drivers/usb/misc/ljca.c index 3e4f85f453dd..7b874b82f1da 100644 --- a/drivers/usb/misc/ljca.c +++ b/drivers/usb/misc/ljca.c @@ -380,6 +380,53 @@ static int ljca_transfer_internal(struct ljca *ljca, u8 cmd, const void *obuf, LJCA_USB_WRITE_ACK_TIMEOUT_MS); } +int ljca_transfer(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len, void *ibuf, + unsigned int *ibuf_len) +{ + return ljca_transfer_internal(ljca, cmd, obuf, obuf_len, ibuf, ibuf_len, true); +} +EXPORT_SYMBOL_NS_GPL(ljca_transfer, LJCA); + +int ljca_transfer_noack(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len) +{ + return ljca_transfer_internal(ljca, cmd, obuf, obuf_len, NULL, NULL, false); +} +EXPORT_SYMBOL_NS_GPL(ljca_transfer_noack, LJCA); + +int ljca_register_event_cb(struct ljca *ljca, ljca_event_cb_t event_cb, void *context) +{ + struct ljca_stub *stub; + unsigned long flags; + + stub = ljca_stub_find(ljca->dev, ljca->type); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + spin_lock_irqsave(&stub->event_cb_lock, flags); + stub->event_entry.notify = event_cb; + stub->event_entry.context = context; + spin_unlock_irqrestore(&stub->event_cb_lock, flags); + + return 0; +} +EXPORT_SYMBOL_NS_GPL(ljca_register_event_cb, LJCA); + +void ljca_unregister_event_cb(struct ljca *ljca) +{ + struct ljca_stub *stub; + unsigned long flags; + + stub = ljca_stub_find(ljca->dev, ljca->type); + if (IS_ERR(stub)) + return; + + spin_lock_irqsave(&stub->event_cb_lock, flags); + stub->event_entry.notify = NULL; + stub->event_entry.context = NULL; + spin_unlock_irqrestore(&stub->event_cb_lock, flags); +} +EXPORT_SYMBOL_NS_GPL(ljca_unregister_event_cb, LJCA); + static void ljca_read_complete(struct urb *urb) { struct ljca_msg *header = urb->transfer_buffer; diff --git a/include/linux/usb/ljca.h b/include/linux/usb/ljca.h index 057f18c5b17a..9ae3ea242294 100644 --- a/include/linux/usb/ljca.h +++ b/include/linux/usb/ljca.h @@ -26,4 +26,70 @@ struct ljca_spi_info { u8 capacity; }; +/** + * typedef ljca_event_cb_t - event callback function signature + * + * @context: the execution context of who registered this callback + * @cmd: the command from device for this event + * @evt_data: the event data payload + * @len: the event data payload length + * + * The callback function is called in interrupt context and the data payload is + * only valid during the call. If the user needs later access of the data, it + * must copy it. + */ +typedef void (*ljca_event_cb_t)(void *context, u8 cmd, const void *evt_data, int len); + +/** + * ljca_register_event_cb - register a callback function to receive events + * + * @ljca: ljca device handle + * @event_cb: callback function + * @context: execution context of event callback + * + * Return: 0 in case of success, negative value in case of error + */ +int ljca_register_event_cb(struct ljca *ljca, ljca_event_cb_t event_cb, void *context); + +/** + * ljca_unregister_event_cb - unregister the callback function for an event + * + * @ljca: ljca device handle + */ +void ljca_unregister_event_cb(struct ljca *ljca); + +/** + * ljca_transfer - issue a LJCA command and wait for a response and the + * associated data + * + * @ljca: ljca device handle + * @cmd: the command to be sent to the device + * @obuf: the buffer to be sent to the device; it can be NULL if the user + * doesn't need to transmit data with this command + * @obuf_len: the size of the buffer to be sent to the device; it should + * be 0 when obuf is NULL + * @ibuf: any data associated with the response will be copied here; it can be + * NULL if the user doesn't need the response data + * @ibuf_len: must be initialized to the input buffer size; it will be modified + * to indicate the actual data transferred; it shouldn't be NULL as well + * when ibuf isn't NULL + * + * Return: 0 for success, negative value for errors + */ +int ljca_transfer(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len, + void *ibuf, unsigned int *ibuf_len); + +/** + * ljca_transfer_noack - issue a LJCA command without a response + * + * @ljca: ljca device handle + * @cmd: the command to be sent to the device + * @obuf: the buffer to be sent to the device; it can be NULL if the user + * doesn't need to transmit data with this command + * @obuf_len: the size of the buffer to be sent to the device + * + * Return: 0 for success, negative value for errors + */ +int ljca_transfer_noack(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len); + #endif From patchwork Thu Mar 23 17:21:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ye Xiang X-Patchwork-Id: 667086 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76402C761AF for ; Thu, 23 Mar 2023 17:21:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231841AbjCWRVm (ORCPT ); Thu, 23 Mar 2023 13:21:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53692 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229508AbjCWRVi (ORCPT ); Thu, 23 Mar 2023 13:21:38 -0400 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E7AA9274BF; Thu, 23 Mar 2023 10:21:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1679592089; x=1711128089; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=JOjP3peX0ZEQlt5bUy6rekVF3QLzY7oGXCu8avzeStM=; b=RTuMT+c3vJv0PUd3N4w7xuXwjRQSnfXa6Hm0RZ3TE81DcUF2/pE3G4zV sC+47LMmIr5gDUExxbCAcM4KTqlmompBpoWCQvd3Ku1FNkquf/dHAMv9X +j7WdPcTm5BNeNg3yjQrHBB1NqQO80dK6SBh1dd/dLY3cU1ZYAl2a3dlO dlBSwsbm8Pmi6HtK71bVCutp51dYC7w90JgW9RKI/yGZ/pcrxHmD51QUh +Wq5X9i5GfaHGJ9XUFZ3HmL4U8qB5Y4odJzCFg4mox2UOob/XTMWvjX6n GUBnk8ZCVUBaQebUZX8kcku5nHYC70QJSp83jSZRmrgnAFjE8br0dGmpN A==; X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="425840253" X-IronPort-AV: E=Sophos;i="5.98,285,1673942400"; d="scan'208";a="425840253" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Mar 2023 10:21:28 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="712748305" X-IronPort-AV: E=Sophos;i="5.98,285,1673942400"; d="scan'208";a="712748305" Received: from ye-nuc7i7dnhe.sh.intel.com ([10.239.154.52]) by orsmga008.jf.intel.com with ESMTP; 23 Mar 2023 10:21:23 -0700 From: Ye Xiang To: Greg Kroah-Hartman , Arnd Bergmann , Matthias Kaehlcke , Lee Jones , Wolfram Sang , Tyrone Ting , Mark Brown , Linus Walleij , Bartosz Golaszewski , linux-usb@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-gpio@vger.kernel.org Cc: srinivas.pandruvada@intel.com, heikki.krogerus@linux.intel.com, andriy.shevchenko@linux.intel.com, sakari.ailus@linux.intel.com, zhifeng.wang@intel.com, wentong.wu@intel.com, lixu.zhang@intel.com, Ye Xiang Subject: [PATCH v6 3/6] Documentation: Add ABI doc for attributes of LJCA device Date: Fri, 24 Mar 2023 01:21:10 +0800 Message-Id: <20230323172113.1231050-4-xiang.ye@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230323172113.1231050-1-xiang.ye@intel.com> References: <20230323172113.1231050-1-xiang.ye@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Add sysfs attributes Documentation entries for LJCA device Signed-off-by: Ye Xiang --- .../ABI/testing/sysfs-bus-usb-devices-ljca | 36 +++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-usb-devices-ljca diff --git a/Documentation/ABI/testing/sysfs-bus-usb-devices-ljca b/Documentation/ABI/testing/sysfs-bus-usb-devices-ljca new file mode 100644 index 000000000000..16eecaf870e2 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-usb-devices-ljca @@ -0,0 +1,36 @@ +What: /sys/bus/usb/.../ljca_version +Date: July 2023 +KernelVersion: 6.4 +Contact: Ye Xiang +Description: + Provides the current firmware version of LJCA device. + The format is Major.Minor.Patch.Build, where + Major, Minor, Patch, and Build are decimal numbers. + For example: 1.0.0.256 + +What: /sys/bus/usb/.../ljca_enable_dfu +Date: July 2023 +KernelVersion: 6.4 +Contact: Ye Xiang +Description: + Writing 1 to this file to force the LJCA device into DFU + mode so the firmware can be updated. After firmware + updating has been done, the device will back to normal + working mode. + +What: /sys/bus/usb/.../ljca_trace_level +Date: July 2023 +KernelVersion: 6.4 +Contact: Ye Xiang +Description: + Writing N to this file to set firmware log level of LJCA + device. The log can be printed to another computer through + UART ports in LJCA device. Valid values: + + == ========== + 0 LEVEL_ERROR + 1 LEVEL_WARNING + 2 LEVEL_INFO + 3 LEVEL_DEBUG + 4 LEVEL_OFF + == ========== From patchwork Thu Mar 23 17:21:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ye Xiang X-Patchwork-Id: 666374 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 854B1C74A5B for ; Thu, 23 Mar 2023 17:21:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231822AbjCWRVx (ORCPT ); Thu, 23 Mar 2023 13:21:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54264 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231514AbjCWRVv (ORCPT ); Thu, 23 Mar 2023 13:21:51 -0400 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 399E726872; Thu, 23 Mar 2023 10:21:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1679592094; x=1711128094; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=pfNde6z+2cqHWv6I5Y4iW05TPTnuZZbsgTrL8zP8cIY=; b=HW9+RcEhD8c1tlcS5pIhoy59C//50p38QHeJ632dT0QPB4pCPWDdCbkM fkMWe5ekb+W1QjVv77JqTi8gPwtqJPpY46L6srP+RqOQs+lNwrOnk54mZ 0DQvgAgDpvm52TQlP2HwTbzS5o7/ufxJrcNXFwIlobHOsNNKYMk2vqgXo r3wLfJyhvNETyRJ4mA6oWPNvNqrqUV6mlIqWWVmNRmYhx3vASzTHP6BkD pgf32icDM9JlgsOxeMR626QMFdgWankZDrHJMRuZpO+YDE4SOUQ0pKfqG I5JTvNH6D2HyGxkXF649hg1Jj3Tl/jowvcknnPHGof6sZhtnue+q3yJvy A==; X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="425840271" X-IronPort-AV: E=Sophos;i="5.98,285,1673942400"; d="scan'208";a="425840271" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Mar 2023 10:21:34 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="712748318" X-IronPort-AV: E=Sophos;i="5.98,285,1673942400"; d="scan'208";a="712748318" Received: from ye-nuc7i7dnhe.sh.intel.com ([10.239.154.52]) by orsmga008.jf.intel.com with ESMTP; 23 Mar 2023 10:21:28 -0700 From: Ye Xiang To: Greg Kroah-Hartman , Arnd Bergmann , Matthias Kaehlcke , Lee Jones , Wolfram Sang , Tyrone Ting , Mark Brown , Linus Walleij , Bartosz Golaszewski , linux-usb@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-gpio@vger.kernel.org Cc: srinivas.pandruvada@intel.com, heikki.krogerus@linux.intel.com, andriy.shevchenko@linux.intel.com, sakari.ailus@linux.intel.com, zhifeng.wang@intel.com, wentong.wu@intel.com, lixu.zhang@intel.com, Ye Xiang Subject: [PATCH v6 4/6] gpio: Add support for Intel LJCA USB GPIO driver Date: Fri, 24 Mar 2023 01:21:11 +0800 Message-Id: <20230323172113.1231050-5-xiang.ye@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230323172113.1231050-1-xiang.ye@intel.com> References: <20230323172113.1231050-1-xiang.ye@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org This patch implements the GPIO function of Intel USB-I2C/GPIO/SPI adapter device named "La Jolla Cove Adapter" (LJCA). It communicate with LJCA GPIO module with specific protocol through interfaces exported by LJCA USB driver. Signed-off-by: Ye Xiang --- drivers/gpio/Kconfig | 12 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-ljca.c | 458 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 471 insertions(+) create mode 100644 drivers/gpio/gpio-ljca.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 13be729710f2..70c57b3ccb22 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1253,6 +1253,18 @@ config GPIO_KEMPLD This driver can also be built as a module. If so, the module will be called gpio-kempld. +config GPIO_LJCA + tristate "INTEL La Jolla Cove Adapter GPIO support" + depends on USB_LJCA + select GPIOLIB_IRQCHIP + default USB_LJCA + help + Select this option to enable GPIO driver for the INTEL + La Jolla Cove Adapter (LJCA) board. + + This driver can also be built as a module. If so, the module + will be called gpio-ljca. + config GPIO_LP3943 tristate "TI/National Semiconductor LP3943 GPIO expander" depends on MFD_LP3943 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index c048ba003367..eb59524d18c0 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -77,6 +77,7 @@ obj-$(CONFIG_GPIO_IXP4XX) += gpio-ixp4xx.o obj-$(CONFIG_GPIO_JANZ_TTL) += gpio-janz-ttl.o obj-$(CONFIG_GPIO_KEMPLD) += gpio-kempld.o obj-$(CONFIG_GPIO_LATCH) += gpio-latch.o +obj-$(CONFIG_GPIO_LJCA) += gpio-ljca.o obj-$(CONFIG_GPIO_LOGICVC) += gpio-logicvc.o obj-$(CONFIG_GPIO_LOONGSON1) += gpio-loongson1.o obj-$(CONFIG_GPIO_LOONGSON) += gpio-loongson.o diff --git a/drivers/gpio/gpio-ljca.c b/drivers/gpio/gpio-ljca.c new file mode 100644 index 000000000000..09a9f06397a5 --- /dev/null +++ b/drivers/gpio/gpio-ljca.c @@ -0,0 +1,458 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Intel La Jolla Cove Adapter USB-GPIO driver + * + * Copyright (c) 2023, Intel Corporation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* GPIO commands */ +#define LJCA_GPIO_CONFIG 1 +#define LJCA_GPIO_READ 2 +#define LJCA_GPIO_WRITE 3 +#define LJCA_GPIO_INT_EVENT 4 +#define LJCA_GPIO_INT_MASK 5 +#define LJCA_GPIO_INT_UNMASK 6 + +#define LJCA_GPIO_CONF_DISABLE BIT(0) +#define LJCA_GPIO_CONF_INPUT BIT(1) +#define LJCA_GPIO_CONF_OUTPUT BIT(2) +#define LJCA_GPIO_CONF_PULLUP BIT(3) +#define LJCA_GPIO_CONF_PULLDOWN BIT(4) +#define LJCA_GPIO_CONF_DEFAULT BIT(5) +#define LJCA_GPIO_CONF_INTERRUPT BIT(6) +#define LJCA_GPIO_INT_TYPE BIT(7) + +#define LJCA_GPIO_CONF_EDGE FIELD_PREP(LJCA_GPIO_INT_TYPE, 1) +#define LJCA_GPIO_CONF_LEVEL FIELD_PREP(LJCA_GPIO_INT_TYPE, 0) + +/* Intentional overlap with PULLUP / PULLDOWN */ +#define LJCA_GPIO_CONF_SET BIT(3) +#define LJCA_GPIO_CONF_CLR BIT(4) + +struct gpio_op { + u8 index; + u8 value; +} __packed; + +struct gpio_packet { + u8 num; + struct gpio_op item[]; +} __packed; + +#define LJCA_GPIO_BUF_SIZE 60 +struct ljca_gpio_dev { + struct auxiliary_device *auxdev; + struct gpio_chip gc; + struct ljca_gpio_info *gpio_info; + DECLARE_BITMAP(unmasked_irqs, LJCA_MAX_GPIO_NUM); + DECLARE_BITMAP(enabled_irqs, LJCA_MAX_GPIO_NUM); + DECLARE_BITMAP(reenable_irqs, LJCA_MAX_GPIO_NUM); + u8 *connect_mode; + /* mutex to protect irq bus */ + struct mutex irq_lock; + struct work_struct work; + /* lock to protect package transfer to Hardware */ + struct mutex trans_lock; + + u8 obuf[LJCA_GPIO_BUF_SIZE]; + u8 ibuf[LJCA_GPIO_BUF_SIZE]; +}; + +static int gpio_config(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id, u8 config) +{ + struct gpio_packet *packet = (struct gpio_packet *)ljca_gpio->obuf; + int ret; + + mutex_lock(&ljca_gpio->trans_lock); + packet->item[0].index = gpio_id; + packet->item[0].value = config | ljca_gpio->connect_mode[gpio_id]; + packet->num = 1; + + ret = ljca_transfer(ljca_gpio->gpio_info->ljca, LJCA_GPIO_CONFIG, packet, + struct_size(packet, item, packet->num), NULL, NULL); + mutex_unlock(&ljca_gpio->trans_lock); + return ret; +} + +static int ljca_gpio_read(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id) +{ + struct gpio_packet *packet = (struct gpio_packet *)ljca_gpio->obuf; + struct gpio_packet *ack_packet = (struct gpio_packet *)ljca_gpio->ibuf; + unsigned int ibuf_len = LJCA_GPIO_BUF_SIZE; + int ret; + + mutex_lock(&ljca_gpio->trans_lock); + packet->num = 1; + packet->item[0].index = gpio_id; + ret = ljca_transfer(ljca_gpio->gpio_info->ljca, LJCA_GPIO_READ, packet, + struct_size(packet, item, packet->num), ljca_gpio->ibuf, &ibuf_len); + if (ret) + goto out_unlock; + + if (!ibuf_len || ack_packet->num != packet->num) { + dev_err(&ljca_gpio->auxdev->dev, "failed gpio_id:%u %u", gpio_id, ack_packet->num); + ret = -EIO; + } + +out_unlock: + mutex_unlock(&ljca_gpio->trans_lock); + if (ret) + return ret; + return ack_packet->item[0].value > 0; +} + +static int ljca_gpio_write(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id, + int value) +{ + struct gpio_packet *packet = (struct gpio_packet *)ljca_gpio->obuf; + int ret; + + mutex_lock(&ljca_gpio->trans_lock); + packet->num = 1; + packet->item[0].index = gpio_id; + packet->item[0].value = value & 1; + + ret = ljca_transfer(ljca_gpio->gpio_info->ljca, LJCA_GPIO_WRITE, packet, + struct_size(packet, item, packet->num), NULL, NULL); + mutex_unlock(&ljca_gpio->trans_lock); + + return ret; +} + +static int ljca_gpio_get_value(struct gpio_chip *chip, unsigned int offset) +{ + struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip); + + return ljca_gpio_read(ljca_gpio, offset); +} + +static void ljca_gpio_set_value(struct gpio_chip *chip, unsigned int offset, + int val) +{ + struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip); + int ret; + + ret = ljca_gpio_write(ljca_gpio, offset, val); + if (ret) + dev_err(chip->parent, "offset:%u val:%d set value failed %d\n", offset, val, ret); +} + +static int ljca_gpio_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip); + u8 config = LJCA_GPIO_CONF_INPUT | LJCA_GPIO_CONF_CLR; + + return gpio_config(ljca_gpio, offset, config); +} + +static int ljca_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, int val) +{ + struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip); + u8 config = LJCA_GPIO_CONF_OUTPUT | LJCA_GPIO_CONF_CLR; + int ret; + + ret = gpio_config(ljca_gpio, offset, config); + if (ret) + return ret; + + ljca_gpio_set_value(chip, offset, val); + + return 0; +} + +static int ljca_gpio_set_config(struct gpio_chip *chip, unsigned int offset, + unsigned long config) +{ + struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip); + + ljca_gpio->connect_mode[offset] = 0; + switch (pinconf_to_config_param(config)) { + case PIN_CONFIG_BIAS_PULL_UP: + ljca_gpio->connect_mode[offset] |= LJCA_GPIO_CONF_PULLUP; + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + ljca_gpio->connect_mode[offset] |= LJCA_GPIO_CONF_PULLDOWN; + break; + case PIN_CONFIG_DRIVE_PUSH_PULL: + case PIN_CONFIG_PERSIST_STATE: + break; + default: + return -ENOTSUPP; + } + + return 0; +} + +static int ljca_gpio_init_valid_mask(struct gpio_chip *chip, unsigned long *valid_mask, + unsigned int ngpios) +{ + struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(chip); + + WARN_ON_ONCE(ngpios != ljca_gpio->gpio_info->num); + bitmap_copy(valid_mask, ljca_gpio->gpio_info->valid_pin_map, ngpios); + + return 0; +} + +static void ljca_gpio_irq_init_valid_mask(struct gpio_chip *chip, unsigned long *valid_mask, + unsigned int ngpios) +{ + ljca_gpio_init_valid_mask(chip, valid_mask, ngpios); +} + +static int ljca_enable_irq(struct ljca_gpio_dev *ljca_gpio, int gpio_id, bool enable) +{ + struct gpio_packet *packet = (struct gpio_packet *)ljca_gpio->obuf; + int ret; + + mutex_lock(&ljca_gpio->trans_lock); + packet->num = 1; + packet->item[0].index = gpio_id; + packet->item[0].value = 0; + + ret = ljca_transfer(ljca_gpio->gpio_info->ljca, + enable ? LJCA_GPIO_INT_UNMASK : LJCA_GPIO_INT_MASK, packet, + struct_size(packet, item, packet->num), NULL, NULL); + mutex_unlock(&ljca_gpio->trans_lock); + + return ret; +} + +static void ljca_gpio_async(struct work_struct *work) +{ + struct ljca_gpio_dev *ljca_gpio = container_of(work, struct ljca_gpio_dev, work); + int gpio_id; + int unmasked; + + for_each_set_bit(gpio_id, ljca_gpio->reenable_irqs, ljca_gpio->gc.ngpio) { + clear_bit(gpio_id, ljca_gpio->reenable_irqs); + unmasked = test_bit(gpio_id, ljca_gpio->unmasked_irqs); + if (unmasked) + ljca_enable_irq(ljca_gpio, gpio_id, true); + } +} + +static void ljca_gpio_event_cb(void *context, u8 cmd, const void *evt_data, int len) +{ + const struct gpio_packet *packet = evt_data; + struct ljca_gpio_dev *ljca_gpio = context; + int i; + int irq; + + if (cmd != LJCA_GPIO_INT_EVENT) + return; + + for (i = 0; i < packet->num; i++) { + irq = irq_find_mapping(ljca_gpio->gc.irq.domain, packet->item[i].index); + if (!irq) { + dev_err(ljca_gpio->gc.parent, "gpio_id %u does not mapped to IRQ yet\n", + packet->item[i].index); + return; + } + + generic_handle_domain_irq(ljca_gpio->gc.irq.domain, irq); + set_bit(packet->item[i].index, ljca_gpio->reenable_irqs); + } + + schedule_work(&ljca_gpio->work); +} + +static void ljca_irq_unmask(struct irq_data *irqd) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd); + struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc); + int gpio_id = irqd_to_hwirq(irqd); + + gpiochip_enable_irq(gc, gpio_id); + set_bit(gpio_id, ljca_gpio->unmasked_irqs); +} + +static void ljca_irq_mask(struct irq_data *irqd) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd); + struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc); + int gpio_id = irqd_to_hwirq(irqd); + + clear_bit(gpio_id, ljca_gpio->unmasked_irqs); + gpiochip_disable_irq(gc, gpio_id); +} + +static int ljca_irq_set_type(struct irq_data *irqd, unsigned int type) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd); + struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc); + int gpio_id = irqd_to_hwirq(irqd); + + ljca_gpio->connect_mode[gpio_id] = LJCA_GPIO_CONF_INTERRUPT; + switch (type) { + case IRQ_TYPE_LEVEL_HIGH: + ljca_gpio->connect_mode[gpio_id] |= (LJCA_GPIO_CONF_LEVEL | LJCA_GPIO_CONF_PULLUP); + break; + case IRQ_TYPE_LEVEL_LOW: + ljca_gpio->connect_mode[gpio_id] |= (LJCA_GPIO_CONF_LEVEL | LJCA_GPIO_CONF_PULLDOWN); + break; + case IRQ_TYPE_EDGE_BOTH: + break; + case IRQ_TYPE_EDGE_RISING: + ljca_gpio->connect_mode[gpio_id] |= (LJCA_GPIO_CONF_EDGE | LJCA_GPIO_CONF_PULLUP); + break; + case IRQ_TYPE_EDGE_FALLING: + ljca_gpio->connect_mode[gpio_id] |= (LJCA_GPIO_CONF_EDGE | LJCA_GPIO_CONF_PULLDOWN); + break; + default: + return -EINVAL; + } + + return 0; +} + +static void ljca_irq_bus_lock(struct irq_data *irqd) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd); + struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc); + + mutex_lock(&ljca_gpio->irq_lock); +} + +static void ljca_irq_bus_unlock(struct irq_data *irqd) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd); + struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc); + int gpio_id = irqd_to_hwirq(irqd); + int enabled; + int unmasked; + + enabled = test_bit(gpio_id, ljca_gpio->enabled_irqs); + unmasked = test_bit(gpio_id, ljca_gpio->unmasked_irqs); + + if (enabled != unmasked) { + if (unmasked) { + gpio_config(ljca_gpio, gpio_id, 0); + ljca_enable_irq(ljca_gpio, gpio_id, true); + set_bit(gpio_id, ljca_gpio->enabled_irqs); + } else { + ljca_enable_irq(ljca_gpio, gpio_id, false); + clear_bit(gpio_id, ljca_gpio->enabled_irqs); + } + } + + mutex_unlock(&ljca_gpio->irq_lock); +} + +static const struct irq_chip ljca_gpio_irqchip = { + .name = "ljca-irq", + .irq_mask = ljca_irq_mask, + .irq_unmask = ljca_irq_unmask, + .irq_set_type = ljca_irq_set_type, + .irq_bus_lock = ljca_irq_bus_lock, + .irq_bus_sync_unlock = ljca_irq_bus_unlock, + .flags = IRQCHIP_IMMUTABLE, + GPIOCHIP_IRQ_RESOURCE_HELPERS, +}; + +static int ljca_gpio_probe(struct auxiliary_device *auxdev, + const struct auxiliary_device_id *aux_dev_id) +{ + struct ljca_gpio_dev *ljca_gpio; + struct gpio_irq_chip *girq; + int ret; + + ljca_gpio = devm_kzalloc(&auxdev->dev, sizeof(*ljca_gpio), GFP_KERNEL); + if (!ljca_gpio) + return -ENOMEM; + + ljca_gpio->gpio_info = dev_get_platdata(&auxdev->dev); + ljca_gpio->connect_mode = devm_kcalloc(&auxdev->dev, ljca_gpio->gpio_info->num, + sizeof(*ljca_gpio->connect_mode), GFP_KERNEL); + if (!ljca_gpio->connect_mode) + return -ENOMEM; + + mutex_init(&ljca_gpio->irq_lock); + mutex_init(&ljca_gpio->trans_lock); + ljca_gpio->auxdev = auxdev; + ljca_gpio->gc.direction_input = ljca_gpio_direction_input; + ljca_gpio->gc.direction_output = ljca_gpio_direction_output; + ljca_gpio->gc.get = ljca_gpio_get_value; + ljca_gpio->gc.set = ljca_gpio_set_value; + ljca_gpio->gc.set_config = ljca_gpio_set_config; + ljca_gpio->gc.init_valid_mask = ljca_gpio_init_valid_mask; + ljca_gpio->gc.can_sleep = true; + ljca_gpio->gc.parent = &auxdev->dev; + + ljca_gpio->gc.base = -1; + ljca_gpio->gc.ngpio = ljca_gpio->gpio_info->num; + ljca_gpio->gc.label = ACPI_COMPANION(&auxdev->dev) ? + acpi_dev_name(ACPI_COMPANION(&auxdev->dev)) : + dev_name(&auxdev->dev); + ljca_gpio->gc.owner = THIS_MODULE; + + auxiliary_set_drvdata(auxdev, ljca_gpio); + ljca_register_event_cb(ljca_gpio->gpio_info->ljca, ljca_gpio_event_cb, ljca_gpio); + + girq = &ljca_gpio->gc.irq; + gpio_irq_chip_set_chip(girq, &ljca_gpio_irqchip); + girq->parent_handler = NULL; + girq->num_parents = 0; + girq->parents = NULL; + girq->default_type = IRQ_TYPE_NONE; + girq->handler = handle_simple_irq; + girq->init_valid_mask = ljca_gpio_irq_init_valid_mask; + + INIT_WORK(&ljca_gpio->work, ljca_gpio_async); + ret = gpiochip_add_data(&ljca_gpio->gc, ljca_gpio); + if (ret) { + ljca_unregister_event_cb(ljca_gpio->gpio_info->ljca); + mutex_destroy(&ljca_gpio->irq_lock); + mutex_destroy(&ljca_gpio->trans_lock); + } + + return ret; +} + +static void ljca_gpio_remove(struct auxiliary_device *auxdev) +{ + struct ljca_gpio_dev *ljca_gpio = auxiliary_get_drvdata(auxdev); + + gpiochip_remove(&ljca_gpio->gc); + ljca_unregister_event_cb(ljca_gpio->gpio_info->ljca); + cancel_work_sync(&ljca_gpio->work); + mutex_destroy(&ljca_gpio->irq_lock); + mutex_destroy(&ljca_gpio->trans_lock); +} + +#define LJCA_GPIO_DRV_NAME "ljca.ljca-gpio" +static const struct auxiliary_device_id ljca_gpio_id_table[] = { + { LJCA_GPIO_DRV_NAME, 0 }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(auxiliary, ljca_gpio_id_table); + +static struct auxiliary_driver ljca_gpio_driver = { + .probe = ljca_gpio_probe, + .remove = ljca_gpio_remove, + .id_table = ljca_gpio_id_table, +}; +module_auxiliary_driver(ljca_gpio_driver); + +MODULE_AUTHOR("Ye Xiang "); +MODULE_AUTHOR("Wang Zhifeng "); +MODULE_AUTHOR("Zhang Lixu "); +MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB-GPIO driver"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(LJCA); From patchwork Thu Mar 23 17:21:12 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ye Xiang X-Patchwork-Id: 667085 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 71FA0C6FD1C for ; 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X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="425840315" X-IronPort-AV: E=Sophos;i="5.98,285,1673942400"; d="scan'208";a="425840315" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Mar 2023 10:21:41 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="712748337" X-IronPort-AV: E=Sophos;i="5.98,285,1673942400"; d="scan'208";a="712748337" Received: from ye-nuc7i7dnhe.sh.intel.com ([10.239.154.52]) by orsmga008.jf.intel.com with ESMTP; 23 Mar 2023 10:21:36 -0700 From: Ye Xiang To: Greg Kroah-Hartman , Arnd Bergmann , Matthias Kaehlcke , Lee Jones , Wolfram Sang , Tyrone Ting , Mark Brown , Linus Walleij , Bartosz Golaszewski , linux-usb@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-gpio@vger.kernel.org Cc: srinivas.pandruvada@intel.com, heikki.krogerus@linux.intel.com, andriy.shevchenko@linux.intel.com, sakari.ailus@linux.intel.com, zhifeng.wang@intel.com, wentong.wu@intel.com, lixu.zhang@intel.com, Ye Xiang Subject: [PATCH v6 5/6] i2c: Add support for Intel LJCA USB I2C driver Date: Fri, 24 Mar 2023 01:21:12 +0800 Message-Id: <20230323172113.1231050-6-xiang.ye@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230323172113.1231050-1-xiang.ye@intel.com> References: <20230323172113.1231050-1-xiang.ye@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org This patch implements the I2C function of Intel USB-I2C/GPIO/SPI adapter device named "La Jolla Cove Adapter" (LJCA). It communicate with LJCA I2c module with specific protocol through interfaces exported by LJCA USB driver. Signed-off-by: Ye Xiang --- drivers/i2c/busses/Kconfig | 11 ++ drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-ljca.c | 355 ++++++++++++++++++++++++++++++++++ 3 files changed, 367 insertions(+) create mode 100644 drivers/i2c/busses/i2c-ljca.c diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 25eb4e8fd22f..37fed62797a9 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -1261,6 +1261,17 @@ config I2C_DLN2 This driver can also be built as a module. If so, the module will be called i2c-dln2. +config I2C_LJCA + tristate "I2C functionality of Intel La Jolla Cove Adapter" + depends on USB_LJCA + default USB_LJCA + help + If you say yes to this option, I2C functionality support of Intel + La Jolla Cove Adapter (LJCA) will be included. + + This driver can also be built as a module. If so, the module + will be called i2c-ljca. + config I2C_CP2615 tristate "Silicon Labs CP2615 USB sound card and I2C adapter" depends on USB diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index af56fe2c75c0..4af5b06ef288 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -133,6 +133,7 @@ obj-$(CONFIG_I2C_GXP) += i2c-gxp.o # External I2C/SMBus adapter drivers obj-$(CONFIG_I2C_DIOLAN_U2C) += i2c-diolan-u2c.o obj-$(CONFIG_I2C_DLN2) += i2c-dln2.o +obj-$(CONFIG_I2C_LJCA) += i2c-ljca.o obj-$(CONFIG_I2C_CP2615) += i2c-cp2615.o obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o obj-$(CONFIG_I2C_PCI1XXXX) += i2c-mchp-pci1xxxx.o diff --git a/drivers/i2c/busses/i2c-ljca.c b/drivers/i2c/busses/i2c-ljca.c new file mode 100644 index 000000000000..de80aa88adb9 --- /dev/null +++ b/drivers/i2c/busses/i2c-ljca.c @@ -0,0 +1,355 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Intel La Jolla Cove Adapter USB-I2C driver + * + * Copyright (c) 2023, Intel Corporation. + */ + +#include +#include +#include +#include +#include +#include +#include + +/* I2C commands */ +enum ljca_i2c_cmd { + LJCA_I2C_INIT = 1, + LJCA_I2C_XFER, + LJCA_I2C_START, + LJCA_I2C_STOP, + LJCA_I2C_READ, + LJCA_I2C_WRITE, +}; + +enum ljca_xfer_type { + LJCA_I2C_READ_XFER_TYPE, + LJCA_I2C_WRITE_XFER_TYPE, +}; + +/* I2C r/w Flags */ +#define LJCA_I2C_SLAVE_TRANSFER_WRITE (0) +#define LJCA_I2C_SLAVE_TRANSFER_READ (1) + +/* I2C init flags */ +#define LJCA_I2C_INIT_FLAG_MODE BIT(0) +#define LJCA_I2C_INIT_FLAG_MODE_POLLING FIELD_PREP(LJCA_I2C_INIT_FLAG_MODE, 0) +#define LJCA_I2C_INIT_FLAG_MODE_INTERRUPT FIELD_PREP(LJCA_I2C_INIT_FLAG_MODE, 1) + +#define LJCA_I2C_INIT_FLAG_ADDR_16BIT BIT(0) + +#define LJCA_I2C_INIT_FLAG_FREQ GENMASK(2, 1) +#define LJCA_I2C_INIT_FLAG_FREQ_100K FIELD_PREP(LJCA_I2C_INIT_FLAG_FREQ, 0) +#define LJCA_I2C_INIT_FLAG_FREQ_400K FIELD_PREP(LJCA_I2C_INIT_FLAG_FREQ, 1) +#define LJCA_I2C_INIT_FLAG_FREQ_1M FIELD_PREP(LJCA_I2C_INIT_FLAG_FREQ, 2) + +/* I2C Transfer */ +struct i2c_xfer { + u8 id; + u8 slave; + u16 flag; /* speed, 8/16bit addr, addr increase, etc */ + u16 addr; + u16 len; + u8 data[]; +} __packed; + +/* I2C raw commands: Init/Start/Read/Write/Stop */ +struct i2c_rw_packet { + u8 id; + __le16 len; + u8 data[]; +} __packed; + +#define LJCA_I2C_BUF_SIZE 60 +#define LJCA_I2C_MAX_XFER_SIZE (LJCA_I2C_BUF_SIZE - sizeof(struct i2c_rw_packet)) + +struct ljca_i2c_dev { + struct auxiliary_device *auxdev; + struct ljca_i2c_info *i2c_info; + struct i2c_adapter adap; + + u8 obuf[LJCA_I2C_BUF_SIZE]; + u8 ibuf[LJCA_I2C_BUF_SIZE]; +}; + +static u8 ljca_i2c_format_slave_addr(u8 slave_addr, u8 type) +{ + return (slave_addr << 1) | (type == LJCA_I2C_READ_XFER_TYPE) ? + LJCA_I2C_SLAVE_TRANSFER_READ : + LJCA_I2C_SLAVE_TRANSFER_WRITE; +} + +static int ljca_i2c_init(struct ljca_i2c_dev *ljca_i2c, u8 id) +{ + struct i2c_rw_packet *w_packet = (struct i2c_rw_packet *)ljca_i2c->obuf; + + memset(w_packet, 0, sizeof(*w_packet)); + w_packet->id = id; + w_packet->data[0] = LJCA_I2C_INIT_FLAG_FREQ_400K; + w_packet->len = cpu_to_le16(sizeof(*w_packet->data)); + + return ljca_transfer(ljca_i2c->i2c_info->ljca, LJCA_I2C_INIT, w_packet, + struct_size(w_packet, data, 1), NULL, NULL); +} + +static int ljca_i2c_start(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr, enum ljca_xfer_type type) +{ + struct i2c_rw_packet *w_packet = (struct i2c_rw_packet *)ljca_i2c->obuf; + struct i2c_rw_packet *r_packet = (struct i2c_rw_packet *)ljca_i2c->ibuf; + unsigned int ibuf_len = LJCA_I2C_BUF_SIZE; + int ret; + s16 rp_len; + + memset(w_packet, 0, sizeof(*w_packet)); + w_packet->id = ljca_i2c->i2c_info->id; + w_packet->data[0] = ljca_i2c_format_slave_addr(slave_addr, type); + w_packet->len = cpu_to_le16(sizeof(*w_packet->data)); + + ret = ljca_transfer(ljca_i2c->i2c_info->ljca, LJCA_I2C_START, w_packet, + struct_size(w_packet, data, 1), r_packet, &ibuf_len); + if (ret) + return ret; + + if (ibuf_len < sizeof(*r_packet)) + return -EIO; + + rp_len = le16_to_cpu(r_packet->len); + if (rp_len < 0 || r_packet->id != w_packet->id) { + dev_err(&ljca_i2c->adap.dev, "i2c start failed len:%d id:%d %d\n", rp_len, + r_packet->id, w_packet->id); + return -EIO; + } + + return 0; +} + +static int ljca_i2c_stop(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr) +{ + struct i2c_rw_packet *w_packet = (struct i2c_rw_packet *)ljca_i2c->obuf; + struct i2c_rw_packet *r_packet = (struct i2c_rw_packet *)ljca_i2c->ibuf; + unsigned int ibuf_len = LJCA_I2C_BUF_SIZE; + int ret; + s16 rp_len; + + memset(w_packet, 0, sizeof(*w_packet)); + w_packet->id = ljca_i2c->i2c_info->id; + w_packet->data[0] = 0; + w_packet->len = cpu_to_le16(sizeof(*w_packet->data)); + + ret = ljca_transfer(ljca_i2c->i2c_info->ljca, LJCA_I2C_STOP, w_packet, + struct_size(w_packet, data, 1), r_packet, &ibuf_len); + if (ret) + return ret; + + if (ibuf_len < sizeof(*r_packet)) + return -EIO; + + rp_len = le16_to_cpu(r_packet->len); + if (rp_len < 0 || r_packet->id != w_packet->id) { + dev_err(&ljca_i2c->adap.dev, "i2c stop failed len:%d id:%d %d\n", rp_len, + r_packet->id, w_packet->id); + return -EIO; + } + + return 0; +} + +static int ljca_i2c_pure_read(struct ljca_i2c_dev *ljca_i2c, u8 *data, u8 len) +{ + struct i2c_rw_packet *w_packet = (struct i2c_rw_packet *)ljca_i2c->obuf; + struct i2c_rw_packet *r_packet = (struct i2c_rw_packet *)ljca_i2c->ibuf; + unsigned int ibuf_len = LJCA_I2C_BUF_SIZE; + int ret; + s16 rp_len; + + if (len > LJCA_I2C_MAX_XFER_SIZE) + return -EINVAL; + + memset(w_packet, 0, sizeof(*w_packet)); + w_packet->id = ljca_i2c->i2c_info->id; + w_packet->len = cpu_to_le16(len); + w_packet->data[0] = 0; + + ret = ljca_transfer(ljca_i2c->i2c_info->ljca, LJCA_I2C_READ, w_packet, + struct_size(w_packet, data, 1), r_packet, &ibuf_len); + if (ret) + return ret; + + if (ibuf_len < sizeof(*r_packet)) + return -EIO; + + rp_len = le16_to_cpu(r_packet->len); + if (rp_len != len || r_packet->id != w_packet->id) { + dev_err(&ljca_i2c->adap.dev, "i2c raw read failed len:%d id:%d %d\n", rp_len, + r_packet->id, w_packet->id); + return -EIO; + } + + memcpy(data, r_packet->data, len); + + return 0; +} + +static int ljca_i2c_read(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr, u8 *data, + u8 len) +{ + int ret; + + ret = ljca_i2c_start(ljca_i2c, slave_addr, LJCA_I2C_READ_XFER_TYPE); + if (ret) + goto out_stop; + + ret = ljca_i2c_pure_read(ljca_i2c, data, len); + +out_stop: + ljca_i2c_stop(ljca_i2c, slave_addr); + + return ret; +} + +static int ljca_i2c_pure_write(struct ljca_i2c_dev *ljca_i2c, u8 *data, u8 len) +{ + struct i2c_rw_packet *w_packet = (struct i2c_rw_packet *)ljca_i2c->obuf; + struct i2c_rw_packet *r_packet = (struct i2c_rw_packet *)ljca_i2c->ibuf; + unsigned int ibuf_len = LJCA_I2C_BUF_SIZE; + s16 rplen; + int ret; + + if (len > LJCA_I2C_MAX_XFER_SIZE) + return -EINVAL; + + memset(w_packet, 0, sizeof(*w_packet)); + w_packet->id = ljca_i2c->i2c_info->id; + w_packet->len = cpu_to_le16(len); + memcpy(w_packet->data, data, len); + + ret = ljca_transfer(ljca_i2c->i2c_info->ljca, LJCA_I2C_WRITE, w_packet, + struct_size(w_packet, data, len), r_packet, &ibuf_len); + if (ret) + return ret; + + if (ibuf_len < sizeof(*r_packet)) + return -EIO; + + rplen = le16_to_cpu(r_packet->len); + if (rplen != len || r_packet->id != w_packet->id) { + dev_err(&ljca_i2c->adap.dev, "i2c write failed len:%d id:%d/%d\n", rplen, + r_packet->id, w_packet->id); + return -EIO; + } + + return 0; +} + +static int ljca_i2c_write(struct ljca_i2c_dev *ljca_i2c, u8 slave_addr, u8 *data, u8 len) +{ + int ret; + + if (!data) + return -EINVAL; + + ret = ljca_i2c_start(ljca_i2c, slave_addr, LJCA_I2C_WRITE_XFER_TYPE); + if (ret) + goto out_stop; + + ret = ljca_i2c_pure_write(ljca_i2c, data, len); + +out_stop: + ljca_i2c_stop(ljca_i2c, slave_addr); + + return ret; +} + +static int ljca_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msg, int num) +{ + struct ljca_i2c_dev *ljca_i2c; + struct i2c_msg *cur_msg; + int i, ret; + + ljca_i2c = i2c_get_adapdata(adapter); + if (!ljca_i2c) + return -EINVAL; + + for (i = 0; i < num; i++) { + cur_msg = &msg[i]; + if (cur_msg->flags & I2C_M_RD) + ret = ljca_i2c_read(ljca_i2c, cur_msg->addr, cur_msg->buf, cur_msg->len); + else + ret = ljca_i2c_write(ljca_i2c, cur_msg->addr, cur_msg->buf, cur_msg->len); + + if (ret) + return ret; + } + + return num; +} + +static u32 ljca_i2c_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; +} + +static const struct i2c_adapter_quirks ljca_i2c_quirks = { + .max_read_len = LJCA_I2C_MAX_XFER_SIZE, + .max_write_len = LJCA_I2C_MAX_XFER_SIZE, +}; + +static const struct i2c_algorithm ljca_i2c_algo = { + .master_xfer = ljca_i2c_xfer, + .functionality = ljca_i2c_func, +}; + +static int ljca_i2c_probe(struct auxiliary_device *auxdev, + const struct auxiliary_device_id *aux_dev_id) +{ + struct ljca_i2c_dev *ljca_i2c; + int ret; + + ljca_i2c = devm_kzalloc(&auxdev->dev, sizeof(*ljca_i2c), GFP_KERNEL); + if (!ljca_i2c) + return -ENOMEM; + + ljca_i2c->auxdev = auxdev; + ljca_i2c->i2c_info = dev_get_platdata(&auxdev->dev); + ljca_i2c->adap.owner = THIS_MODULE; + ljca_i2c->adap.class = I2C_CLASS_HWMON; + ljca_i2c->adap.algo = &ljca_i2c_algo; + ljca_i2c->adap.quirks = &ljca_i2c_quirks; + ljca_i2c->adap.dev.parent = &auxdev->dev; + device_set_node(&ljca_i2c->adap.dev, dev_fwnode(&auxdev->dev)); + i2c_set_adapdata(&ljca_i2c->adap, ljca_i2c); + snprintf(ljca_i2c->adap.name, sizeof(ljca_i2c->adap.name), "%s-%s-%d", + dev_name(&auxdev->dev), dev_name(auxdev->dev.parent), + ljca_i2c->i2c_info->id); + + auxiliary_set_drvdata(auxdev, ljca_i2c); + + ret = ljca_i2c_init(ljca_i2c, ljca_i2c->i2c_info->id); + if (ret) { + dev_err(&auxdev->dev, "i2c init failed id:%d\n", ljca_i2c->i2c_info->id); + return -EIO; + } + + return devm_i2c_add_adapter(&auxdev->dev, &ljca_i2c->adap); +} + +#define LJCA_I2C_DRV_NAME "ljca.ljca-i2c" +static const struct auxiliary_device_id ljca_i2c_id_table[] = { + { LJCA_I2C_DRV_NAME, 0 }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(auxiliary, ljca_i2c_id_table); + +static struct auxiliary_driver ljca_i2c_driver = { + .probe = ljca_i2c_probe, + .id_table = ljca_i2c_id_table, +}; +module_auxiliary_driver(ljca_i2c_driver); + +MODULE_AUTHOR("Ye Xiang "); +MODULE_AUTHOR("Wang Zhifeng "); +MODULE_AUTHOR("Zhang Lixu "); +MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB-I2C driver"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(LJCA); From patchwork Thu Mar 23 17:21:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ye Xiang X-Patchwork-Id: 666373 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B8D6C76196 for ; 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X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="425840357" X-IronPort-AV: E=Sophos;i="5.98,285,1673942400"; d="scan'208";a="425840357" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Mar 2023 10:21:48 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="712748349" X-IronPort-AV: E=Sophos;i="5.98,285,1673942400"; d="scan'208";a="712748349" Received: from ye-nuc7i7dnhe.sh.intel.com ([10.239.154.52]) by orsmga008.jf.intel.com with ESMTP; 23 Mar 2023 10:21:42 -0700 From: Ye Xiang To: Greg Kroah-Hartman , Arnd Bergmann , Matthias Kaehlcke , Lee Jones , Wolfram Sang , Tyrone Ting , Mark Brown , Linus Walleij , Bartosz Golaszewski , linux-usb@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-gpio@vger.kernel.org Cc: srinivas.pandruvada@intel.com, heikki.krogerus@linux.intel.com, andriy.shevchenko@linux.intel.com, sakari.ailus@linux.intel.com, zhifeng.wang@intel.com, wentong.wu@intel.com, lixu.zhang@intel.com, Ye Xiang Subject: [PATCH v6 6/6] spi: Add support for Intel LJCA USB SPI driver Date: Fri, 24 Mar 2023 01:21:13 +0800 Message-Id: <20230323172113.1231050-7-xiang.ye@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230323172113.1231050-1-xiang.ye@intel.com> References: <20230323172113.1231050-1-xiang.ye@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org This patch implements the SPI function of Intel USB-I2C/GPIO/SPI adapter device named "La Jolla Cove Adapter" (LJCA). It communicate with LJCA SPI module with specific protocol through interfaces exported by LJCA USB driver. Signed-off-by: Ye Xiang --- drivers/spi/Kconfig | 11 ++ drivers/spi/Makefile | 1 + drivers/spi/spi-ljca.c | 289 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 301 insertions(+) create mode 100644 drivers/spi/spi-ljca.c diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 47bbba04fe3a..c3de4e20531f 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -404,6 +404,17 @@ config SPI_HISI_SFC_V3XX This enables support for HiSilicon v3xx SPI NOR flash controller found in hi16xx chipsets. +config SPI_LJCA + tristate "Intel La Jolla Cove Adapter SPI support" + depends on USB_LJCA + default USB_LJCA + help + Select this option to enable SPI driver for the Intel + La Jolla Cove Adapter (LJCA) board. + + This driver can also be built as a module. If so, the module + will be called spi-ljca. + config SPI_NXP_FLEXSPI tristate "NXP Flex SPI controller" depends on ARCH_LAYERSCAPE || HAS_IOMEM diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index d87cf75bee6a..0d0cc1b0fb9b 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -69,6 +69,7 @@ obj-$(CONFIG_SPI_INTEL_PCI) += spi-intel-pci.o obj-$(CONFIG_SPI_INTEL_PLATFORM) += spi-intel-platform.o obj-$(CONFIG_SPI_LANTIQ_SSC) += spi-lantiq-ssc.o obj-$(CONFIG_SPI_JCORE) += spi-jcore.o +obj-$(CONFIG_SPI_LJCA) += spi-ljca.o obj-$(CONFIG_SPI_LM70_LLP) += spi-lm70llp.o obj-$(CONFIG_SPI_LP8841_RTC) += spi-lp8841-rtc.o obj-$(CONFIG_SPI_MESON_SPICC) += spi-meson-spicc.o diff --git a/drivers/spi/spi-ljca.c b/drivers/spi/spi-ljca.c new file mode 100644 index 000000000000..1d925e8c7156 --- /dev/null +++ b/drivers/spi/spi-ljca.c @@ -0,0 +1,289 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Intel La Jolla Cove Adapter USB-SPI driver + * + * Copyright (c) 2023, Intel Corporation. + */ + +#include +#include +#include +#include +#include +#include +#include + +/* SPI commands */ +enum ljca_spi_cmd { + LJCA_SPI_INIT = 1, + LJCA_SPI_READ, + LJCA_SPI_WRITE, + LJCA_SPI_WRITEREAD, + LJCA_SPI_DEINIT, +}; + +#define LJCA_SPI_BUS_MAX_HZ 48000000 +enum { + LJCA_SPI_BUS_SPEED_24M, + LJCA_SPI_BUS_SPEED_12M, + LJCA_SPI_BUS_SPEED_8M, + LJCA_SPI_BUS_SPEED_6M, + LJCA_SPI_BUS_SPEED_4_8M, /*4.8MHz*/ + LJCA_SPI_BUS_SPEED_MIN = LJCA_SPI_BUS_SPEED_4_8M, +}; + +enum { + LJCA_SPI_CLOCK_LOW_POLARITY, + LJCA_SPI_CLOCK_HIGH_POLARITY, +}; + +enum { + LJCA_SPI_CLOCK_FIRST_PHASE, + LJCA_SPI_CLOCK_SECOND_PHASE, +}; + +#define LJCA_SPI_BUF_SIZE 60 +#define LJCA_SPI_MAX_XFER_SIZE (LJCA_SPI_BUF_SIZE - sizeof(struct spi_xfer_packet)) + +#define LJCA_SPI_CLK_MODE_POLARITY BIT(0) +#define LJCA_SPI_CLK_MODE_PHASE BIT(1) + +struct spi_init_packet { + u8 index; + u8 speed; + u8 mode; +} __packed; + +#define LJCA_SPI_XFER_INDICATOR_ID GENMASK(5, 0) +#define LJCA_SPI_XFER_INDICATOR_CMPL BIT(6) +#define LJCA_SPI_XFER_INDICATOR_INDEX BIT(7) + +struct spi_xfer_packet { + u8 indicator; + s8 len; + u8 data[]; +} __packed; + +struct ljca_spi_dev { + struct auxiliary_device *auxdev; + struct spi_controller *controller; + struct ljca_spi_info *spi_info; + u8 speed; + u8 mode; + + u8 obuf[LJCA_SPI_BUF_SIZE]; + u8 ibuf[LJCA_SPI_BUF_SIZE]; +}; + +static int ljca_spi_read_write(struct ljca_spi_dev *ljca_spi, const u8 *w_data, u8 *r_data, int len, + int id, int complete, int cmd) +{ + struct spi_xfer_packet *w_packet = (struct spi_xfer_packet *)ljca_spi->obuf; + struct spi_xfer_packet *r_packet = (struct spi_xfer_packet *)ljca_spi->ibuf; + unsigned int ibuf_len = LJCA_SPI_BUF_SIZE; + int ret; + + w_packet->indicator = FIELD_PREP(LJCA_SPI_XFER_INDICATOR_ID, id) | + FIELD_PREP(LJCA_SPI_XFER_INDICATOR_CMPL, complete) | + FIELD_PREP(LJCA_SPI_XFER_INDICATOR_INDEX, + ljca_spi->spi_info->id); + + if (cmd == LJCA_SPI_READ) { + w_packet->len = sizeof(u16); + *(__le16 *)&w_packet->data[0] = cpu_to_le16(len); + } else { + w_packet->len = len; + memcpy(w_packet->data, w_data, len); + } + + ret = ljca_transfer(ljca_spi->spi_info->ljca, cmd, w_packet, + struct_size(w_packet, data, w_packet->len), r_packet, &ibuf_len); + if (ret) + return ret; + + if (ibuf_len < sizeof(*r_packet) || r_packet->len <= 0) + return -EIO; + + if (r_data) + memcpy(r_data, r_packet->data, r_packet->len); + + return 0; +} + +static int ljca_spi_init(struct ljca_spi_dev *ljca_spi, u8 div, u8 mode) +{ + struct spi_init_packet w_packet = {}; + int ret; + + if (ljca_spi->mode == mode && ljca_spi->speed == div) + return 0; + + w_packet.mode = FIELD_PREP(LJCA_SPI_CLK_MODE_POLARITY, + (mode & SPI_CPOL) ? LJCA_SPI_CLOCK_HIGH_POLARITY : + LJCA_SPI_CLOCK_LOW_POLARITY) | + FIELD_PREP(LJCA_SPI_CLK_MODE_PHASE, + (mode & SPI_CPHA) ? LJCA_SPI_CLOCK_SECOND_PHASE : + LJCA_SPI_CLOCK_FIRST_PHASE); + + w_packet.index = ljca_spi->spi_info->id; + w_packet.speed = div; + ret = ljca_transfer(ljca_spi->spi_info->ljca, LJCA_SPI_INIT, &w_packet, + sizeof(w_packet), NULL, NULL); + if (ret) + return ret; + + ljca_spi->mode = mode; + ljca_spi->speed = div; + + return 0; +} + +static int ljca_spi_deinit(struct ljca_spi_dev *ljca_spi) +{ + struct spi_init_packet w_packet = {}; + + w_packet.index = ljca_spi->spi_info->id; + return ljca_transfer(ljca_spi->spi_info->ljca, LJCA_SPI_DEINIT, &w_packet, sizeof(w_packet), + NULL, NULL); +} + +static inline int ljca_spi_transfer(struct ljca_spi_dev *ljca_spi, const u8 *tx_data, u8 *rx_data, + u16 len) +{ + int remaining = len; + int offset = 0; + int cur_len; + int complete; + int i; + int cmd; + int ret; + + if (tx_data && rx_data) + cmd = LJCA_SPI_WRITEREAD; + else if (tx_data) + cmd = LJCA_SPI_WRITE; + else if (rx_data) + cmd = LJCA_SPI_READ; + else + return -EINVAL; + + for (i = 0; remaining > 0; i++) { + cur_len = min_t(unsigned int, remaining, LJCA_SPI_MAX_XFER_SIZE); + complete = (cur_len == remaining); + + ret = ljca_spi_read_write(ljca_spi, + tx_data ? tx_data + offset : NULL, + rx_data ? rx_data + offset : NULL, + cur_len, i, complete, cmd); + if (ret) + return ret; + + offset += cur_len; + remaining -= cur_len; + } + + return 0; +} + +static int ljca_spi_transfer_one(struct spi_controller *controller, struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct ljca_spi_dev *ljca_spi = spi_controller_get_devdata(controller); + int ret; + u8 div; + + div = min_t(u8, LJCA_SPI_BUS_SPEED_MIN, + DIV_ROUND_UP(controller->max_speed_hz, xfer->speed_hz) / 2 - 1); + ret = ljca_spi_init(ljca_spi, div, spi->mode); + if (ret) { + dev_err(&ljca_spi->auxdev->dev, "cannot initialize transfer ret %d\n", ret); + return ret; + } + + ret = ljca_spi_transfer(ljca_spi, xfer->tx_buf, xfer->rx_buf, xfer->len); + if (ret) + dev_err(&ljca_spi->auxdev->dev, "ljca spi transfer failed!\n"); + + return ret; +} + +static int ljca_spi_probe(struct auxiliary_device *auxdev, + const struct auxiliary_device_id *aux_dev_id) +{ + struct spi_controller *controller; + struct ljca_spi_dev *ljca_spi; + int ret; + + controller = devm_spi_alloc_master(&auxdev->dev, sizeof(*ljca_spi)); + if (!controller) + return -ENOMEM; + + auxiliary_set_drvdata(auxdev, controller); + ljca_spi = spi_controller_get_devdata(controller); + + ljca_spi->spi_info = dev_get_platdata(&auxdev->dev); + ljca_spi->controller = controller; + ljca_spi->auxdev = auxdev; + device_set_node(&ljca_spi->controller->dev, dev_fwnode(&auxdev->dev)); + + controller->bus_num = -1; + controller->mode_bits = SPI_CPHA | SPI_CPOL; + controller->transfer_one = ljca_spi_transfer_one; + controller->auto_runtime_pm = false; + controller->max_speed_hz = LJCA_SPI_BUS_MAX_HZ; + + ret = spi_register_controller(controller); + if (ret) + dev_err(&auxdev->dev, "Failed to register controller\n"); + + return ret; +} + +static void ljca_spi_dev_remove(struct auxiliary_device *auxdev) +{ + struct spi_controller *controller = auxiliary_get_drvdata(auxdev); + struct ljca_spi_dev *ljca_spi = spi_controller_get_devdata(controller); + + spi_unregister_controller(controller); + ljca_spi_deinit(ljca_spi); +} + +static int ljca_spi_dev_suspend(struct device *dev) +{ + struct spi_controller *controller = dev_get_drvdata(dev); + + return spi_controller_suspend(controller); +} + +static int ljca_spi_dev_resume(struct device *dev) +{ + struct spi_controller *controller = dev_get_drvdata(dev); + + return spi_controller_resume(controller); +} + +static const struct dev_pm_ops ljca_spi_pm = { + SYSTEM_SLEEP_PM_OPS(ljca_spi_dev_suspend, ljca_spi_dev_resume) +}; + +#define LJCA_SPI_DRV_NAME "ljca.ljca-spi" +static const struct auxiliary_device_id ljca_spi_id_table[] = { + { LJCA_SPI_DRV_NAME, 0 }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(auxiliary, ljca_spi_id_table); + +static struct auxiliary_driver ljca_spi_driver = { + .driver.pm = &ljca_spi_pm, + .probe = ljca_spi_probe, + .remove = ljca_spi_dev_remove, + .id_table = ljca_spi_id_table, +}; +module_auxiliary_driver(ljca_spi_driver); + +MODULE_AUTHOR("Ye Xiang "); +MODULE_AUTHOR("Wang Zhifeng "); +MODULE_AUTHOR("Zhang Lixu "); +MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB-SPI driver"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(LJCA);