From patchwork Thu Apr 8 10:36:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pho Tran X-Patchwork-Id: 417937 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AFB35C433ED for ; Thu, 8 Apr 2021 10:36:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 66DCC61165 for ; Thu, 8 Apr 2021 10:36:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229803AbhDHKg2 (ORCPT ); Thu, 8 Apr 2021 06:36:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56970 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229517AbhDHKg2 (ORCPT ); Thu, 8 Apr 2021 06:36:28 -0400 Received: from mail-pf1-x42c.google.com (mail-pf1-x42c.google.com [IPv6:2607:f8b0:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D8CFEC061760; Thu, 8 Apr 2021 03:36:15 -0700 (PDT) Received: by mail-pf1-x42c.google.com with SMTP id g15so1501459pfq.3; Thu, 08 Apr 2021 03:36:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=r54a73bdhXR6ZgNUrTkowOviMUc7mQo3RVtvTIuikUA=; b=HwOplOxSrB12Al/VhaGKaN3DJRO+1rLCtwJo8I1vRWZxWt1fYf3OVrE/wB3aA6j3cu qQq2jrlT2MU60vv1EHk2TMZr8ZlwD7I9dBEvAbH1ZnwXOSoRP+ie9GyatKPnQTJFcuBk 9rwa5PK8GA30lVbr3+8FleHh1zfhPrdsWLMrY5xzjNk7zRexn9vcyzZQjbv7ASZ25NTq yrnzEV4vpob5DN2zOL1MuuPqru+cesn6ouoqRn5WJtc4+/bXhe9mXcGBfiBw7wFeQred ZIBx/JtaD7pkcAFEfc5dzEFlLtZfyauOaZwvth28/YMvB7WslnwwGxOr/wNd1HCuoOdJ fSFg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=r54a73bdhXR6ZgNUrTkowOviMUc7mQo3RVtvTIuikUA=; b=LNU0tXNVcvhWS+tMjb1atUIjUhjvFn7TGS0Qa1S8VZDMsBYkf8ctpAB8Jebqo4DmDj esL6q43AMNRerXLo+oW0kuCcMzGotdFbIAQBdB2fKTS+kRTH7RGS7muXJcqldGm7byFb IYccCfq55thCTS3q5VujuObAmYP9UyeRkoNW6P9YIdcJ7tw4nfvGyqXeOJMHSc2N6nQL zawsKSONwi3hXexlidQPe8H3ZkETRbJQn1WwhNN7S7L1Xrhjtk3PjGR3qc7gLWNOQ2tH prkbmUeZIqV68mt4dTUS8KZURVDnGnvZZTTsCx/sNu46hvv6Y4q14EZv5nu8CRFydil2 +hAw== X-Gm-Message-State: AOAM532OEva+Osl+ogtHqbUBqEZ8nYP0tjXy9CHpyrB5wPvgpd4OeVMH 2C7P13umaHj5SLPj/bjUJ/Y= X-Google-Smtp-Source: ABdhPJxN1LMffVZUopo7TACJzRsAouIuOH+eROiPk8DkV1W0FYnTBOH95pmF9sgyJM928VFeCEPl7g== X-Received: by 2002:a63:2213:: with SMTP id i19mr7533549pgi.242.1617878175291; Thu, 08 Apr 2021 03:36:15 -0700 (PDT) Received: from localhost.localdomain ([27.67.21.149]) by smtp.gmail.com with ESMTPSA id c129sm24898403pfb.141.2021.04.08.03.36.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Apr 2021 03:36:14 -0700 (PDT) From: Pho Tran To: johan@kernel.org, gregkh@linuxfoundation.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Hung.Nguyen@silabs.com, Tung.Pham@silabs.com, Pho Tran Subject: [PATCH v9] USB: serial: cp210x: Add support for GPIOs on CP2108 Date: Thu, 8 Apr 2021 17:36:07 +0700 Message-Id: <20210408103607.2077-1-photranvan0712@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Pho Tran Similar to other CP210x devices, GPIO interfaces (gpiochip) should be supported for CP2108. CP2108 has 4 serial interfaces but only 1 set of GPIO pins are shared to all of those interfaces. So, just need to initialize GPIOs of CP2108 with only one interface (I use interface 0). It means just only 1 gpiochip device file will be created for CP2108. CP2108 has 16 GPIOs, So data types of several variables need to be is u16 instead of u8(in struct cp210x_serial_private). This doesn't affect other CP210x devices. Because CP2108 has 16 GPIO pins, the parameter passed by cp210x functions will be different from other CP210x devices. So need to check part number of the device to use correct data format before sending commands to devices. Like CP2104, CP2108 have GPIO pins with configurable options. Therefore, should be mask all pins which are not in GPIO mode in cp2108_gpio_init() function. Signed-off-by: Pho Tran --- 04/08/2021: Patch v8 Fixed build warning reported by kernel test robot with ARCH=i386 04/05/2021: Patch v7 Modified commit message follow Greg's comment. 04/05/2021: Patch v6 Fixed build warning reported by kernel test robot with ARCH=x86_64 03/15/2021: Patch v5 Modified code according to comment of Johan: 1. Unified the handling of CP2108 and other types and take care about endianness. 2. Used suitable types data for variable. 3. Fixed cp2108_gpio_init and add more detail on commit message and comment. 4. Dropped some of the ones that don't add any value. 03/12/2021: Patch v4 used git send-mail instead of send patch by manual follow the instructions of Johan Hovold . 03/05/2021: Patch v3 modified format and contents of changelog follow feedback from Johan Hovold . 03/04/2021: Patch v2 modified format patch as comment from Johan Hovold : 1. Break commit message lines at 80 cols 2. Use kernel u8 and u16 instead of the c99 ones. 03/01/2021: Initialed submission of patch "Make the CP210x driver work with GPIOs of CP2108.". drivers/usb/serial/cp210x.c | 254 +++++++++++++++++++++++++++++++----- 1 file changed, 220 insertions(+), 34 deletions(-) diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c index 7bec1e730b20..3812aac2b015 100644 --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -245,9 +245,9 @@ struct cp210x_serial_private { #ifdef CONFIG_GPIOLIB struct gpio_chip gc; bool gpio_registered; - u8 gpio_pushpull; - u8 gpio_altfunc; - u8 gpio_input; + u16 gpio_pushpull; + u16 gpio_altfunc; + u16 gpio_input; #endif u8 partnum; speed_t min_speed; @@ -399,6 +399,18 @@ static struct usb_serial_driver * const serial_drivers[] = { #define CP210X_PARTNUM_CP2102N_QFN20 0x22 #define CP210X_PARTNUM_UNKNOWN 0xFF +/* + * CP2108 Define bit locations for EnhancedFxn_IFCx + * Refer to https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf + * for more information. + */ +#define EF_IFC_GPIO_TXLED 0x01 +#define EF_IFC_GPIO_RXLED 0x02 +#define EF_IFC_GPIO_RS485 0x04 +#define EF_IFC_GPIO_RS485_LOGIC 0x08 +#define EF_IFC_GPIO_CLOCK 0x10 +#define EF_IFC_DYNAMIC_SUSPEND 0x40 + /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ struct cp210x_comm_status { __le32 ulErrors; @@ -500,6 +512,45 @@ struct cp210x_single_port_config { u8 device_cfg; } __packed; +/* + * Quad Port Config definitions + * Refer to https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf + * for more information. + * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes + * on a CP2108 chip. + * CP2108 Quad Port State structure(used in Quad Port Config structure) + */ +struct cp210x_quad_port_state { + __le16 gpio_mode_PB0; + __le16 gpio_mode_PB1; + __le16 gpio_mode_PB2; + __le16 gpio_mode_PB3; + __le16 gpio_mode_PB4; + + + __le16 gpio_lowpower_PB0; + __le16 gpio_lowpower_PB1; + __le16 gpio_lowpower_PB2; + __le16 gpio_lowpower_PB3; + __le16 gpio_lowpower_PB4; + + __le16 gpio_latch_PB0; + __le16 gpio_latch_PB1; + __le16 gpio_latch_PB2; + __le16 gpio_latch_PB3; + __le16 gpio_latch_PB4; +}; + +// Cp2108 Quad Port Config structure +struct cp210x_quad_port_config { + struct cp210x_quad_port_state reset_state; + struct cp210x_quad_port_state suspend_state; + u8 ipdelay_IFC[4]; + u8 enhancedfxn_IFC[4]; + u8 enhancedfxn_device; + u8 extclkfreq[4]; +} __packed; + /* GPIO modes */ #define CP210X_SCI_GPIO_MODE_OFFSET 9 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) @@ -510,6 +561,9 @@ struct cp210x_single_port_config { #define CP210X_GPIO_MODE_OFFSET 8 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) +#define CP2108_GPIO_MODE_OFFSET 0 +#define CP2108_GPIO_MODE_MASK GENMASK(15, 0) + /* CP2105 port configuration values */ #define CP2105_GPIO0_TXLED_MODE BIT(0) #define CP2105_GPIO1_RXLED_MODE BIT(1) @@ -526,12 +580,31 @@ struct cp210x_single_port_config { #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 -/* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ -struct cp210x_gpio_write { +/* + * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these + * 0x04 bytes on CP2108. + */ +struct cp210x_16gpios_write { + __le16 mask; + __le16 state; +}; + +/* + * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these + * 0x02 bytes on CP2102N, Cp2103, Cp2104 and CP2105. + */ +struct cp210x_8gpios_write { u8 mask; u8 state; }; +//Struct cp210x_gpio_write include devices have both of 8 gpios and 16 gpios. +struct cp210x_gpio_write { + struct cp210x_8gpios_write cp210x_8gpios; + struct cp210x_16gpios_write cp210x_16gpios; +}; + + /* * Helper to get interface number when we only have struct usb_serial. */ @@ -1298,21 +1371,46 @@ static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) struct cp210x_serial_private *priv = usb_get_serial_data(serial); u8 req_type = REQTYPE_DEVICE_TO_HOST; int result; - u8 buf; - - if (priv->partnum == CP210X_PARTNUM_CP2105) - req_type = REQTYPE_INTERFACE_TO_HOST; + u16 buf; + __le16 wbuf; result = usb_autopm_get_interface(serial->interface); if (result) return result; - - result = cp210x_read_vendor_block(serial, req_type, - CP210X_READ_LATCH, &buf, sizeof(buf)); - usb_autopm_put_interface(serial->interface); +/* + * This function will be read latch value of gpio and storage to buf(16bit) + * where bit 0 is GPIO0, bit 1 is GPIO1, etc. Up to GPIOn where n is + * total number of GPIO pins the interface supports. + * Interfaces on CP2102N supports 7 GPIOs + * Interfaces on CP2103 amd CP2104 supports 4 GPIOs + * Enhanced interfaces on CP2105 support 3 GPIOs + * Standard interfaces on CP2105 support 4 GPIOs + * Interfaces on CP2108 supports 16 GPIOs + */ + switch (priv->partnum) { + /* + * Request type to Read_Latch of CP2105 and Cp2108 + * is 0xc1 + */ + case CP210X_PARTNUM_CP2108: + req_type = REQTYPE_INTERFACE_TO_HOST; + result = cp210x_read_vendor_block(serial, req_type, + CP210X_READ_LATCH, &wbuf, sizeof(__le16)); + break; + case CP210X_PARTNUM_CP2105: + req_type = REQTYPE_INTERFACE_TO_HOST; + result = cp210x_read_vendor_block(serial, req_type, + CP210X_READ_LATCH, &wbuf, sizeof(u8)); + break; + default: + result = cp210x_read_vendor_block(serial, req_type, + CP210X_READ_LATCH, &wbuf, sizeof(u8)); + break; + } if (result < 0) return result; - + buf = le16_to_cpu(wbuf); + usb_autopm_put_interface(serial->interface); return !!(buf & BIT(gpio)); } @@ -1321,37 +1419,49 @@ static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) struct usb_serial *serial = gpiochip_get_data(gc); struct cp210x_serial_private *priv = usb_get_serial_data(serial); struct cp210x_gpio_write buf; + u16 wIndex; int result; - if (value == 1) - buf.state = BIT(gpio); - else - buf.state = 0; - - buf.mask = BIT(gpio); + if (value == 1) { + buf.cp210x_8gpios.state = BIT(gpio); + buf.cp210x_16gpios.state = cpu_to_le16(BIT(gpio)); + } else { + buf.cp210x_8gpios.state = 0; + buf.cp210x_16gpios.state = 0; + } + buf.cp210x_8gpios.mask = BIT(gpio); + buf.cp210x_16gpios.mask = cpu_to_le16(BIT(gpio)); result = usb_autopm_get_interface(serial->interface); if (result) goto out; - if (priv->partnum == CP210X_PARTNUM_CP2105) { + switch (priv->partnum) { + case CP210X_PARTNUM_CP2108: result = cp210x_write_vendor_block(serial, - REQTYPE_HOST_TO_INTERFACE, - CP210X_WRITE_LATCH, &buf, - sizeof(buf)); - } else { - u16 wIndex = buf.state << 8 | buf.mask; - + REQTYPE_HOST_TO_INTERFACE, + CP210X_WRITE_LATCH, &buf.cp210x_16gpios, + sizeof(buf.cp210x_16gpios)); + break; + case CP210X_PARTNUM_CP2105: + result = cp210x_write_vendor_block(serial, + REQTYPE_HOST_TO_INTERFACE, + CP210X_WRITE_LATCH, &buf.cp210x_8gpios, + sizeof(buf.cp210x_8gpios)); + break; + default: + wIndex = buf.cp210x_8gpios.state << 8 | buf.cp210x_8gpios.mask; result = usb_control_msg(serial->dev, - usb_sndctrlpipe(serial->dev, 0), - CP210X_VENDOR_SPECIFIC, - REQTYPE_HOST_TO_DEVICE, - CP210X_WRITE_LATCH, - wIndex, - NULL, 0, USB_CTRL_SET_TIMEOUT); + usb_sndctrlpipe(serial->dev, 0), + CP210X_VENDOR_SPECIFIC, + REQTYPE_HOST_TO_DEVICE, + CP210X_WRITE_LATCH, + wIndex, + NULL, 0, USB_CTRL_SET_TIMEOUT); + break; } - usb_autopm_put_interface(serial->interface); + out: if (result < 0) { dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", @@ -1420,6 +1530,73 @@ static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, return -ENOTSUPP; } +static int cp2108_gpio_init(struct usb_serial *serial) +{ + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + struct cp210x_quad_port_config config; + u16 gpio_latch; + u16 temp; + int result; + u8 i; + + result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, + CP210X_GET_PORTCONFIG, &config, + sizeof(config)); + if (result < 0) + return result; + priv->gc.ngpio = 16; + temp = le16_to_cpu(config.reset_state.gpio_mode_PB1); + priv->gpio_pushpull = (temp & CP2108_GPIO_MODE_MASK) >> CP2108_GPIO_MODE_OFFSET; + temp = le16_to_cpu(config.reset_state.gpio_latch_PB1); + gpio_latch = (temp & CP2108_GPIO_MODE_MASK) >> CP2108_GPIO_MODE_OFFSET; + /* + * Mark all pins which are not in GPIO mode + * Refer to table 9.1: GPIO Mode alternate Functions on CP2108 datasheet: + * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf + * Alternate Functions of GPIO0 to GPIO3 is determine by enhancedfxn_IFC[0] + * and the same for other pins, enhancedfxn_IFC[1]: GPIO4 to GPIO7, + * enhancedfxn_IFC[2]: GPIO8 to GPIO11, enhancedfxn_IFC[3]: GPIO12 to GPIO15. + */ + for (i = 0; i < 4; i++) { + switch (config.enhancedfxn_IFC[i]) { + case EF_IFC_GPIO_TXLED: + priv->gpio_altfunc |= BIT(i * 4); + break; + case EF_IFC_GPIO_RXLED: + priv->gpio_altfunc |= BIT((i * 4) + 1); + break; + case EF_IFC_GPIO_RS485_LOGIC: + case EF_IFC_GPIO_RS485: + priv->gpio_altfunc |= BIT((i * 4) + 2); + break; + case EF_IFC_GPIO_CLOCK: + priv->gpio_altfunc |= BIT((i * 4) + 3); + break; + case EF_IFC_DYNAMIC_SUSPEND: + priv->gpio_altfunc |= BIT(i * 4); + priv->gpio_altfunc |= BIT((i * 4) + 1); + priv->gpio_altfunc |= BIT((i * 4) + 2); + priv->gpio_altfunc |= BIT((i * 4) + 3); + break; + } + } + /* + * Like CP2102N, CP2108 has also no strict input and output pin + * modes. + * Do the same input mode emulation as CP2102N. + */ + for (i = 0; i < priv->gc.ngpio; ++i) { + /* + * Set direction to "input" iff pin is open-drain and reset + * value is 1. + */ + if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) + priv->gpio_input |= BIT(i); + } + + return 0; +} + /* * This function is for configuring GPIO using shared pins, where other signals * are made unavailable by configuring the use of GPIO. This is believed to be @@ -1649,6 +1826,15 @@ static int cp210x_gpio_init(struct usb_serial *serial) case CP210X_PARTNUM_CP2102N_QFN20: result = cp2102n_gpioconf_init(serial); break; + case CP210X_PARTNUM_CP2108: + /* + * The GPIOs are not tied to any specific port so onlu register + * once for interface 0. + */ + if (cp210x_interface_num(serial) != 0) + return 0; + result = cp2108_gpio_init(serial); + break; default: return 0; }