From patchwork Fri Dec 2 22:47:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Allen Webb X-Patchwork-Id: 630580 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 3638EC4321E for ; Fri, 2 Dec 2022 22:48:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234912AbiLBWsM (ORCPT ); Fri, 2 Dec 2022 17:48:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43838 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234913AbiLBWsL (ORCPT ); Fri, 2 Dec 2022 17:48:11 -0500 Received: from mail-il1-x14a.google.com (mail-il1-x14a.google.com [IPv6:2607:f8b0:4864:20::14a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 83DF2A7A8A for ; Fri, 2 Dec 2022 14:48:08 -0800 (PST) Received: by mail-il1-x14a.google.com with SMTP id i7-20020a056e021b0700b003033a763270so5398641ilv.19 for ; Fri, 02 Dec 2022 14:48:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=GZkL2mzVFhVdShj7BdixsMt9iJ1crReLgzm32R5ZX4A=; b=eTxd1if7I2PlmTTqNfma8EthWz1pu5SyQ/Trbnp3mDe+8QjCa+w7N7/qQuwYTnsYAe xDm+pjLN/1+uOxoghtWda8DcBxyEZZ/atuAYO34dgOBsPLtC6uYVLdF8v6lfDn8YUvRJ Q8X0p3Vmr26UD6VFov0sxjtaGZJLlMcfRzUrzvIM95S9T+oKE51PiQZvrxkIh/pZjQuS 98sVQ9xr4bPQqwBExHo9uR+GzT86VRV0bhmd+lWqvWWSPrWN/NbIpw+dltxWTe709qzj ib9y2Y9oe43/FDrWFq6s8HTOZd+ibhul981XarIZoHGTjjjU/K3+9Lw2xh+rnZjtpaXf 0fYQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=GZkL2mzVFhVdShj7BdixsMt9iJ1crReLgzm32R5ZX4A=; b=mi9BoUUyJsowfr/hEKwtbRTFXqoGCdfBo9loCOkZTxRhZ4gWV69JOxyMqb2ZJ62L7C sGqAfgGZ48GN0krjIk2LgNZ82MnvGVSxbSseC1HmLu4Lc9fSoN9m3OsPr3/Ln7zoKMTK dkiYcXLoxzOlE/tDllLpiytacDBYjSzPZsfDu1cfhFywlgj/PINGoMy9kUDInC9ghz+D 5E9SwMzERlwfvy64/70uTdz7u/n0Gbqj2Z0LPYiqfiu6yzJlZrvu7tzZHHOB7e+DYSzt c2gjxLqXi58fNM/RUKyAZbmCX/K6Ax7ksNEQ89xAM30+HsgaDrrXmTmFYDN3GbIn34kV zvdw== X-Gm-Message-State: ANoB5pmuQy3GpNM7pjh7mrUDSgnXYua9lVV/nKzNc+N5hnQCdsD7zEhl 1rmH/1zoQV/0ENt5zi75/3ea+TZOaklGXeU= X-Google-Smtp-Source: AA0mqf4CUEbp5f3KOGSPXC6yqYWsYvWS7F4SXJGXcppDhUu8bi4voAssmnRsRF4p1fkxFN+LhhnRUF4J3/qbJmk= X-Received: from allenwebb.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:12e8]) (user=allenwebb job=sendgmr) by 2002:a05:6602:408b:b0:6bb:f9be:3691 with SMTP id bl11-20020a056602408b00b006bbf9be3691mr31961743iob.123.1670021288075; Fri, 02 Dec 2022 14:48:08 -0800 (PST) Date: Fri, 2 Dec 2022 16:47:44 -0600 In-Reply-To: <20221202224744.1447448-1-allenwebb@google.com> Mime-Version: 1.0 References: <20221202224540.1446952-1-allenwebb@google.com> <20221202224744.1447448-1-allenwebb@google.com> X-Mailer: git-send-email 2.39.0.rc0.267.gcb52ba06e7-goog Message-ID: <20221202224744.1447448-5-allenwebb@google.com> Subject: [PATCH v6 5/5] drivers: Implement module modaliases for USB From: Allen Webb To: "linux-modules@vger.kernel.org" , "linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" Cc: Luis Chamberlain , Greg Kroah-Hartman , "Rafael J. Wysocki" , Allen Webb Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Add the per-subsystem logic needed to print match-based modaliases to the USB subsystem, so the modalias sysfs attribute for modules will function for modules that register USB drivers. Signed-off-by: Allen Webb --- drivers/base/Makefile | 2 +- drivers/base/base.h | 8 + drivers/base/mod_devicetable.c | 257 +++++++++++++++++++++++++++++++++ drivers/usb/core/driver.c | 2 + 4 files changed, 268 insertions(+), 1 deletion(-) create mode 100644 drivers/base/mod_devicetable.c diff --git a/drivers/base/Makefile b/drivers/base/Makefile index 83217d243c25b..924d46ae987f4 100644 --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -15,7 +15,7 @@ obj-y += firmware_loader/ obj-$(CONFIG_NUMA) += node.o obj-$(CONFIG_MEMORY_HOTPLUG) += memory.o ifeq ($(CONFIG_SYSFS),y) -obj-$(CONFIG_MODULES) += module.o +obj-$(CONFIG_MODULES) += mod_devicetable.o module.o endif obj-$(CONFIG_SYS_HYPERVISOR) += hypervisor.o obj-$(CONFIG_REGMAP) += regmap/ diff --git a/drivers/base/base.h b/drivers/base/base.h index b902d1ecc247f..fec56271104fa 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -173,6 +173,14 @@ static inline void module_add_driver(struct module *mod, static inline void module_remove_driver(struct device_driver *drv) { } #endif +#if defined(CONFIG_SYSFS) && defined(CONFIG_MODULES) +ssize_t usb_drv_to_modalias(struct device_driver *drv, char *buf, + size_t count); +#else +static inline ssize_t usb_drv_to_modalias(struct device_driver *drv, char *buf, + size_t count) { return -EINVAL; } +#endif + #ifdef CONFIG_DEVTMPFS extern int devtmpfs_init(void); #else diff --git a/drivers/base/mod_devicetable.c b/drivers/base/mod_devicetable.c new file mode 100644 index 0000000000000..d7f198aad430f --- /dev/null +++ b/drivers/base/mod_devicetable.c @@ -0,0 +1,257 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * mod_devicetable.c - helpers for displaying modaliases through sysfs. + * + * This borrows a lot from file2alias.c + */ + +#include +#include +#include + +#include "base.h" +#include "../usb/core/usb.h" + +/* Helper macro to add a modalias field to the string buffer associated with + * a match id. + * + * Note that: + * + len should be a ssize_t and is modified in the macro + * + sep should be a string literal and is concatenated as part of a format + * string + * + field is the struct field of the match id + */ +#define ADD(buf, count, len, sep, cond, field) \ +do { \ + char *buf_ = buf; \ + size_t count_ = count; \ + if (cond) \ + (len) += scnprintf(&buf_[len], \ + count_ - (len), \ + sizeof(field) == 1 ? (sep "%02X") : \ + sizeof(field) == 2 ? (sep "%04X") : \ + sizeof(field) == 4 ? (sep "%08X") : "", \ + (field)); \ + else \ + (len) += scnprintf(&buf_[len], count_ - (len), (sep "*")); \ +} while (0) + +#ifdef CONFIG_USB +/* USB related modaliases can be split because of device number matching, so + * this function handles individual modaliases for one segment of the range. + */ +static ssize_t usb_id_to_modalias(const struct usb_device_id *id, + unsigned int bcdDevice_initial, + int bcdDevice_initial_digits, + unsigned char range_lo, + unsigned char range_hi, + unsigned char max, const char *mod_name, + char *buf, size_t count) +{ + ssize_t len = 0; + + ADD(buf, count, len, "alias usb:v", + id->match_flags & USB_DEVICE_ID_MATCH_VENDOR, id->idVendor); + ADD(buf, count, len, "p", id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT, + id->idProduct); + + len += scnprintf(&buf[len], count - len, "d"); + if (bcdDevice_initial_digits) + len += scnprintf(&buf[len], count - len, "%0*X", + bcdDevice_initial_digits, bcdDevice_initial); + if (range_lo == range_hi) { + len += scnprintf(&buf[len], count - len, "%X", range_lo); + } else if (range_lo > 0 || range_hi < max) { + if (range_lo > 0x9 || range_hi < 0xA) { + len += scnprintf(&buf[len], count - len, "[%X-%X]", + range_lo, range_hi); + } else { + len += scnprintf(&buf[len], count - len, + range_lo < 0x9 ? "[%X-9" : "[%X", + range_lo); + len += scnprintf(&buf[len], count - len, + range_hi > 0xA ? "A-%X]" : "%X]", + range_hi); + } + } + if (bcdDevice_initial_digits < (sizeof(id->bcdDevice_lo) * 2 - 1)) + len += scnprintf(&buf[len], count - len, "*"); + + ADD(buf, count, len, "dc", + id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS, id->bDeviceClass); + ADD(buf, count, len, "dsc", + id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS, + id->bDeviceSubClass); + ADD(buf, count, len, "dp", + id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL, + id->bDeviceProtocol); + ADD(buf, count, len, "ic", + id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS, + id->bInterfaceClass); + ADD(buf, count, len, "isc", + id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS, + id->bInterfaceSubClass); + ADD(buf, count, len, "ip", + id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL, + id->bInterfaceProtocol); + ADD(buf, count, len, "in", + id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER, + id->bInterfaceNumber); + + len += scnprintf(&buf[len], count - len, " %s\n", mod_name); + return len; +} + +/* Handles increment/decrement of BCD formatted integers */ +/* Returns the previous value, so it works like i++ or i-- */ +static unsigned int incbcd(unsigned int *bcd, + int inc, + unsigned char max, + size_t chars) +{ + unsigned int init = *bcd, i, j; + unsigned long long c, dec = 0, div; + + /* If bcd is not in BCD format, just increment */ + if (max > 0x9) { + *bcd += inc; + return init; + } + + /* Convert BCD to Decimal */ + for (i = 0 ; i < chars ; i++) { + c = (*bcd >> (i << 2)) & 0xf; + c = c > 9 ? 9 : c; /* force to bcd just in case */ + for (j = 0 ; j < i ; j++) + c = c * 10; + dec += c; + } + + /* Do our increment/decrement */ + dec += inc; + *bcd = 0; + + /* Convert back to BCD */ + for (i = 0 ; i < chars ; i++) { + for (c = 1, j = 0 ; j < i ; j++) + c = c * 10; + div = dec; + (void)do_div(div, c); /* div = div / c */ + c = do_div(div, 10); /* c = div % 10; div = div / 10 */ + *bcd += c << (i << 2); + } + return init; +} + +/* Print the modaliases for the specified struct usb_device_id. */ +static ssize_t usb_id_to_modalias_multi(const struct usb_device_id *id, + const char *mod_name, char *buf, + size_t count) +{ + ssize_t len = 0; + unsigned int devlo, devhi; + unsigned char chi, clo, max; + int ndigits; + + devlo = id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO ? + id->bcdDevice_lo : 0x0U; + devhi = id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI ? + id->bcdDevice_hi : ~0x0U; + + /* Figure out if this entry is in bcd or hex format */ + max = 0x9; /* Default to decimal format */ + for (ndigits = 0 ; ndigits < sizeof(id->bcdDevice_lo) * 2 ; ndigits++) { + clo = (devlo >> (ndigits << 2)) & 0xf; + chi = ((devhi > 0x9999 ? 0x9999 : devhi) >> + (ndigits << 2)) & 0xf; + if (clo > max || chi > max) { + max = 0xf; + break; + } + } + + /* + * Some modules (visor) have empty slots as placeholder for + * run-time specification that results in catch-all alias + */ + if (!(id->idVendor || id->idProduct || id->bDeviceClass || + id->bInterfaceClass)) + return len; + + /* Convert numeric bcdDevice range into fnmatch-able pattern(s) */ + for (ndigits = sizeof(id->bcdDevice_lo) * 2 - 1; devlo <= devhi; + ndigits--) { + clo = devlo & 0xf; + chi = devhi & 0xf; + /* If we are in bcd mode, truncate if necessary */ + if (chi > max) + chi = max; + devlo >>= 4; + devhi >>= 4; + + if (devlo == devhi || !ndigits) { + len += usb_id_to_modalias(id, devlo, ndigits, clo, chi, + max, mod_name, buf + len, + count - len); + break; + } + + if (clo > 0x0) + len += usb_id_to_modalias(id, + incbcd(&devlo, 1, max, + sizeof(id->bcdDevice_lo) * 2), + ndigits, clo, max, max, mod_name, buf + len, + count - len); + + if (chi < max) + len += usb_id_to_modalias(id, + incbcd(&devhi, -1, max, + sizeof(id->bcdDevice_lo) * 2), + ndigits, 0x0, chi, max, mod_name, buf + len, + count - len); + } + return len; +} + +/* Print the modaliases for the given driver assumed to be an usb_driver or + * usb_device_driver. + * + * "alias" is prepended and the module name is appended to each modalias to + * match the format in modules.aliases. + * + * The modaliases will be written out to @buf with @count being the maximum + * bytes to write. The return value is a negative errno on error or the number + * of bytes written to @buf on success. + */ +ssize_t usb_drv_to_modalias(struct device_driver *drv, char *buf, + size_t count) +{ + ssize_t len = 0; + const struct usb_device_id *id; + const char *mod_name; + + if (drv->bus != &usb_bus_type) + return -EINVAL; + + if (drv->owner) + mod_name = drv->owner->name; + else + mod_name = drv->mod_name; + + if (is_usb_device_driver(drv)) + id = to_usb_device_driver(drv)->id_table; + else + id = to_usb_driver(drv)->id_table; + if (!id) + return len; + + for (; id->match_flags; id++) { + len += usb_id_to_modalias_multi(id, mod_name, buf + len, + count - len); + } + return len; +} +#else +inline ssize_t usb_drv_to_modalias(struct device_driver *drv, char *buf, + size_t count){ return 0; } +#endif diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 7e7e119c253fb..fdbc197b64c9c 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -32,6 +32,7 @@ #include #include +#include "../../base/base.h" #include "usb.h" @@ -2030,4 +2031,5 @@ struct bus_type usb_bus_type = { .match = usb_device_match, .uevent = usb_uevent, .need_parent_lock = true, + .drv_to_modalias = usb_drv_to_modalias, };