![Linus Torvalds](/assets/img/avatar_default.png)
- Fix a regression in leds-gpio introduced by a recent commit that inadvertently changed the name of one of the properties used by the driver (Fabio Estevam). - Fix a regression in the ACPI backlight driver introduced by a recent fix that missed one special case that had to be taken into account (Aaron Lu). - Drop the level of some new kernel messages from the ACPI core introduced by a recent commit to KERN_DEBUG which they should have used from the start and drop some other unuseful KERN_ERR messages printed by ACPI (Rafael J Wysocki). - Revert an incorrect commit modifying the cpupower tool (Prarit Bhargava). - Fix two regressions introduced by recent commits in the OPP library and clean up some existing minor issues in that code (Viresh Kumar). - Continue to replace CONFIG_PM_RUNTIME with CONFIG_PM throughout the tree (or drop it where that can be done) in order to make it possible to eliminate CONFIG_PM_RUNTIME (Rafael J Wysocki, Ulf Hansson, Ludovic Desroches). There will be one more "CONFIG_PM_RUNTIME removal" batch after this one, because some new uses of it have been introduced during the current merge window, but that should be sufficient to finally get rid of it. - Make the ACPI EC driver more robust against race conditions related to GPE handler installation failures (Lv Zheng). - Prevent the ACPI device PM core code from attempting to disable GPEs that it has not enabled which confuses ACPICA and makes it report errors unnecessarily (Rafael J Wysocki). - Add a "force" command line switch to the intel_pstate driver to make it possible to override the blacklisting of some systems in that driver if needed (Ethan Zhao). - Improve intel_pstate code documentation and add a MAINTAINERS entry for it (Kristen Carlson Accardi). - Make the ACPI fan driver create cooling device interfaces witn names that reflect the IDs of the ACPI device objects they are associated with, except for "generic" ACPI fans (PNP ID "PNP0C0B"). That's necessary for user space thermal management tools to be able to connect the fans with the parts of the system they are supposed to be cooling properly. From Srinivas Pandruvada. / -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAABCAAGBQJUk0IDAAoJEILEb/54YlRx7fgP/3+yF/0TnEW93j2ALDAQFiLF tSv2A2vQC8vtMJjjWx0z/HqPh86gfaReEFZmUJD/Q/e2LXEnxNZJ+QMjcekPVkDM mTvcIMc2MR8vOA/oMkgxeaKregrrx7RkCfojd+NWZhVukkjl+mvBHgAnYjXRL+NZ unDWGlbHG97vq/3kGjPYhDS00nxHblw8NHFBu5HL5RxwABdWoeZJITwqxXWyuPLw nlqNWlOxmwvtSbw2VMKz0uof1nFHyQLykYsMG0ZsyayCRdWUZYkEqmE7GGpCLkLu D6yfmlpen6ccIOsEAae0eXBt50IFY9Tihk5lovx1mZmci2SNRg29BqMI105wIn0u 8b8Ej7MNHp7yMxRpB5WfU90p/y7ioJns9guFZxY0CKaRnrI2+BLt3RscMi3MPI06 Cu2/WkSSa09fhDPA+pk+VDYsmWgyVawigesNmMP5/cvYO/yYywVRjOuO1k77qQGp 4dSpFYEHfpxinejZnVZOk2V9MkvSLoSMux6wPV0xM0IE1iD0ulVpHjTJrwp80ph4 +bfUFVr/vrD1y7EKbf1PD363ZKvJhWhvQWDgETsM1vgLf21PfWO7C2kflIAsWsdQ 1ukD5nCBRlP4K73hG7bdM6kRztXhUdR0SHg85/t0KB/ExiVqtcXIzB60D0G1lENd QlKbq3O4lim1WGuhazQY =5fo2 -----END PGP SIGNATURE----- Merge tag 'pm+acpi-3.19-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull more ACPI and power management updates from Rafael Wysocki: "These are regression fixes (leds-gpio, ACPI backlight driver, operating performance points library, ACPI device enumeration messages, cpupower tool), other bug fixes (ACPI EC driver, ACPI device PM), some cleanups in the operating performance points (OPP) framework, continuation of CONFIG_PM_RUNTIME elimination, a couple of minor intel_pstate driver changes, a new MAINTAINERS entry for it and an ACPI fan driver change needed for better support of thermal management in user space. Specifics: - Fix a regression in leds-gpio introduced by a recent commit that inadvertently changed the name of one of the properties used by the driver (Fabio Estevam). - Fix a regression in the ACPI backlight driver introduced by a recent fix that missed one special case that had to be taken into account (Aaron Lu). - Drop the level of some new kernel messages from the ACPI core introduced by a recent commit to KERN_DEBUG which they should have used from the start and drop some other unuseful KERN_ERR messages printed by ACPI (Rafael J Wysocki). - Revert an incorrect commit modifying the cpupower tool (Prarit Bhargava). - Fix two regressions introduced by recent commits in the OPP library and clean up some existing minor issues in that code (Viresh Kumar). - Continue to replace CONFIG_PM_RUNTIME with CONFIG_PM throughout the tree (or drop it where that can be done) in order to make it possible to eliminate CONFIG_PM_RUNTIME (Rafael J Wysocki, Ulf Hansson, Ludovic Desroches). There will be one more "CONFIG_PM_RUNTIME removal" batch after this one, because some new uses of it have been introduced during the current merge window, but that should be sufficient to finally get rid of it. - Make the ACPI EC driver more robust against race conditions related to GPE handler installation failures (Lv Zheng). - Prevent the ACPI device PM core code from attempting to disable GPEs that it has not enabled which confuses ACPICA and makes it report errors unnecessarily (Rafael J Wysocki). - Add a "force" command line switch to the intel_pstate driver to make it possible to override the blacklisting of some systems in that driver if needed (Ethan Zhao). - Improve intel_pstate code documentation and add a MAINTAINERS entry for it (Kristen Carlson Accardi). - Make the ACPI fan driver create cooling device interfaces witn names that reflect the IDs of the ACPI device objects they are associated with, except for "generic" ACPI fans (PNP ID "PNP0C0B"). That's necessary for user space thermal management tools to be able to connect the fans with the parts of the system they are supposed to be cooling properly. From Srinivas Pandruvada" * tag 'pm+acpi-3.19-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (32 commits) MAINTAINERS: add entry for intel_pstate ACPI / video: update the skip case for acpi_video_device_in_dod() power / PM: Eliminate CONFIG_PM_RUNTIME NFC / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM SCSI / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM ACPI / EC: Fix unexpected ec_remove_handlers() invocations Revert "tools: cpupower: fix return checks for sysfs_get_idlestate_count()" tracing / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM x86 / PM: Replace CONFIG_PM_RUNTIME in io_apic.c PM: Remove the SET_PM_RUNTIME_PM_OPS() macro mmc: atmel-mci: use SET_RUNTIME_PM_OPS() macro PM / Kconfig: Replace PM_RUNTIME with PM in dependencies ARM / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM sound / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM phy / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM video / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM tty / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM spi: Replace CONFIG_PM_RUNTIME with CONFIG_PM ACPI / PM: Do not disable wakeup GPEs that have not been enabled ACPI / utils: Drop error messages from acpi_evaluate_reference() ...
304 lines
7.6 KiB
C
304 lines
7.6 KiB
C
/*
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* LEDs driver for GPIOs
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*
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* Copyright (C) 2007 8D Technologies inc.
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* Raphael Assenat <raph@8d.com>
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* Copyright (C) 2008 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/kernel.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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struct gpio_led_data {
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struct led_classdev cdev;
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struct gpio_desc *gpiod;
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struct work_struct work;
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u8 new_level;
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u8 can_sleep;
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u8 blinking;
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int (*platform_gpio_blink_set)(struct gpio_desc *desc, int state,
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unsigned long *delay_on, unsigned long *delay_off);
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};
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static void gpio_led_work(struct work_struct *work)
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{
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struct gpio_led_data *led_dat =
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container_of(work, struct gpio_led_data, work);
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if (led_dat->blinking) {
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led_dat->platform_gpio_blink_set(led_dat->gpiod,
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led_dat->new_level, NULL, NULL);
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led_dat->blinking = 0;
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} else
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gpiod_set_value_cansleep(led_dat->gpiod, led_dat->new_level);
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}
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static void gpio_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct gpio_led_data *led_dat =
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container_of(led_cdev, struct gpio_led_data, cdev);
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int level;
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if (value == LED_OFF)
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level = 0;
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else
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level = 1;
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/* Setting GPIOs with I2C/etc requires a task context, and we don't
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* seem to have a reliable way to know if we're already in one; so
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* let's just assume the worst.
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*/
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if (led_dat->can_sleep) {
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led_dat->new_level = level;
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schedule_work(&led_dat->work);
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} else {
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if (led_dat->blinking) {
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led_dat->platform_gpio_blink_set(led_dat->gpiod, level,
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NULL, NULL);
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led_dat->blinking = 0;
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} else
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gpiod_set_value(led_dat->gpiod, level);
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}
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}
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static int gpio_blink_set(struct led_classdev *led_cdev,
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unsigned long *delay_on, unsigned long *delay_off)
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{
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struct gpio_led_data *led_dat =
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container_of(led_cdev, struct gpio_led_data, cdev);
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led_dat->blinking = 1;
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return led_dat->platform_gpio_blink_set(led_dat->gpiod, GPIO_LED_BLINK,
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delay_on, delay_off);
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}
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static int create_gpio_led(const struct gpio_led *template,
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struct gpio_led_data *led_dat, struct device *parent,
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int (*blink_set)(struct gpio_desc *, int, unsigned long *,
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unsigned long *))
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{
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int ret, state;
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led_dat->gpiod = template->gpiod;
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if (!led_dat->gpiod) {
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/*
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* This is the legacy code path for platform code that
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* still uses GPIO numbers. Ultimately we would like to get
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* rid of this block completely.
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*/
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unsigned long flags = 0;
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/* skip leds that aren't available */
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if (!gpio_is_valid(template->gpio)) {
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dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n",
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template->gpio, template->name);
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return 0;
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}
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if (template->active_low)
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flags |= GPIOF_ACTIVE_LOW;
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ret = devm_gpio_request_one(parent, template->gpio, flags,
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template->name);
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if (ret < 0)
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return ret;
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led_dat->gpiod = gpio_to_desc(template->gpio);
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if (IS_ERR(led_dat->gpiod))
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return PTR_ERR(led_dat->gpiod);
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}
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led_dat->cdev.name = template->name;
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led_dat->cdev.default_trigger = template->default_trigger;
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led_dat->can_sleep = gpiod_cansleep(led_dat->gpiod);
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led_dat->blinking = 0;
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if (blink_set) {
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led_dat->platform_gpio_blink_set = blink_set;
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led_dat->cdev.blink_set = gpio_blink_set;
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}
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led_dat->cdev.brightness_set = gpio_led_set;
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if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
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state = !!gpiod_get_value_cansleep(led_dat->gpiod);
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else
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state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
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led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
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if (!template->retain_state_suspended)
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led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
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ret = gpiod_direction_output(led_dat->gpiod, state);
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if (ret < 0)
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return ret;
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INIT_WORK(&led_dat->work, gpio_led_work);
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return led_classdev_register(parent, &led_dat->cdev);
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}
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static void delete_gpio_led(struct gpio_led_data *led)
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{
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led_classdev_unregister(&led->cdev);
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cancel_work_sync(&led->work);
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}
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struct gpio_leds_priv {
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int num_leds;
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struct gpio_led_data leds[];
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};
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static inline int sizeof_gpio_leds_priv(int num_leds)
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{
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return sizeof(struct gpio_leds_priv) +
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(sizeof(struct gpio_led_data) * num_leds);
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}
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static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct fwnode_handle *child;
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struct gpio_leds_priv *priv;
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int count, ret;
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struct device_node *np;
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count = device_get_child_node_count(dev);
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if (!count)
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return ERR_PTR(-ENODEV);
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priv = devm_kzalloc(dev, sizeof_gpio_leds_priv(count), GFP_KERNEL);
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if (!priv)
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return ERR_PTR(-ENOMEM);
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device_for_each_child_node(dev, child) {
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struct gpio_led led = {};
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const char *state = NULL;
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led.gpiod = devm_get_gpiod_from_child(dev, child);
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if (IS_ERR(led.gpiod)) {
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fwnode_handle_put(child);
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goto err;
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}
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np = of_node(child);
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if (fwnode_property_present(child, "label")) {
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fwnode_property_read_string(child, "label", &led.name);
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} else {
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if (IS_ENABLED(CONFIG_OF) && !led.name && np)
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led.name = np->name;
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if (!led.name)
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return ERR_PTR(-EINVAL);
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}
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fwnode_property_read_string(child, "linux,default-trigger",
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&led.default_trigger);
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if (!fwnode_property_read_string(child, "default-state",
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&state)) {
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if (!strcmp(state, "keep"))
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led.default_state = LEDS_GPIO_DEFSTATE_KEEP;
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else if (!strcmp(state, "on"))
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led.default_state = LEDS_GPIO_DEFSTATE_ON;
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else
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led.default_state = LEDS_GPIO_DEFSTATE_OFF;
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}
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if (fwnode_property_present(child, "retain-state-suspended"))
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led.retain_state_suspended = 1;
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ret = create_gpio_led(&led, &priv->leds[priv->num_leds++],
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dev, NULL);
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if (ret < 0) {
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fwnode_handle_put(child);
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goto err;
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}
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}
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return priv;
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err:
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for (count = priv->num_leds - 2; count >= 0; count--)
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delete_gpio_led(&priv->leds[count]);
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return ERR_PTR(-ENODEV);
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}
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static const struct of_device_id of_gpio_leds_match[] = {
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{ .compatible = "gpio-leds", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_gpio_leds_match);
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static int gpio_led_probe(struct platform_device *pdev)
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{
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struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
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struct gpio_leds_priv *priv;
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int i, ret = 0;
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if (pdata && pdata->num_leds) {
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priv = devm_kzalloc(&pdev->dev,
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sizeof_gpio_leds_priv(pdata->num_leds),
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GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->num_leds = pdata->num_leds;
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for (i = 0; i < priv->num_leds; i++) {
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ret = create_gpio_led(&pdata->leds[i],
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&priv->leds[i],
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&pdev->dev, pdata->gpio_blink_set);
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if (ret < 0) {
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/* On failure: unwind the led creations */
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for (i = i - 1; i >= 0; i--)
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delete_gpio_led(&priv->leds[i]);
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return ret;
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}
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}
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} else {
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priv = gpio_leds_create(pdev);
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if (IS_ERR(priv))
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return PTR_ERR(priv);
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}
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platform_set_drvdata(pdev, priv);
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return 0;
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}
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static int gpio_led_remove(struct platform_device *pdev)
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{
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struct gpio_leds_priv *priv = platform_get_drvdata(pdev);
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int i;
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for (i = 0; i < priv->num_leds; i++)
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delete_gpio_led(&priv->leds[i]);
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return 0;
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}
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static struct platform_driver gpio_led_driver = {
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.probe = gpio_led_probe,
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.remove = gpio_led_remove,
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.driver = {
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.name = "leds-gpio",
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.of_match_table = of_gpio_leds_match,
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},
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};
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module_platform_driver(gpio_led_driver);
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MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
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MODULE_DESCRIPTION("GPIO LED driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:leds-gpio");
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