leds: add LED driver for Big Network series LEDs (24467832) · Commits · e / devices / android_kernel_fairphone_FP3

arch/arm/mach-kirkwood/include/mach/leds-netxbig.h

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		/*
		* arch/arm/mach-kirkwood/include/mach/leds-netxbig.h
		*
		* Platform data structure for netxbig LED driver
		*
		* This file is licensed under the terms of the GNU General Public
		* License version 2. This program is licensed "as is" without any
		* warranty of any kind, whether express or implied.
		*/

		#ifndef __MACH_LEDS_NETXBIG_H
		#define __MACH_LEDS_NETXBIG_H

		struct netxbig_gpio_ext {
		unsigned *addr;
		int num_addr;
		unsigned *data;
		int num_data;
		unsigned enable;
		};

		enum netxbig_led_mode {
		NETXBIG_LED_OFF,
		NETXBIG_LED_ON,
		NETXBIG_LED_SATA,
		NETXBIG_LED_TIMER1,
		NETXBIG_LED_TIMER2,
		NETXBIG_LED_MODE_NUM,
		};

		#define NETXBIG_LED_INVALID_MODE NETXBIG_LED_MODE_NUM

		struct netxbig_led_timer {
		unsigned long delay_on;
		unsigned long delay_off;
		enum netxbig_led_mode mode;
		};

		struct netxbig_led {
		const char *name;
		const char *default_trigger;
		int mode_addr;
		int *mode_val;
		int bright_addr;
		};

		struct netxbig_led_platform_data {
		struct netxbig_gpio_ext *gpio_ext;
		struct netxbig_led_timer *timer;
		int num_timer;
		struct netxbig_led *leds;
		int num_leds;
		};

		#endif /* __MACH_LEDS_NETXBIG_H */

drivers/leds/Kconfig

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		@@ -311,6 +311,15 @@ config LEDS_NS2
		Network Space v2 board (and parents). This include Internet Space v2,
		Network Space (Max) v2 and d2 Network v2 boards.

		config LEDS_NETXBIG
		tristate "LED support for Big Network series LEDs"
		depends on MACH_NET2BIG_V2 \|\| MACH_NET5BIG_V2
		default y
		help
		This option enable support for LEDs found on the LaCie 2Big
		and 5Big Network v2 boards. The LEDs are wired to a CPLD and are
		controlled through a GPIO extension bus.

		config LEDS_TRIGGERS
		bool "LED Trigger support"
		help

drivers/leds/Makefile

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		@@ -38,6 +38,7 @@ obj-$(CONFIG_LEDS_ADP5520) += leds-adp5520.o
		obj-$(CONFIG_LEDS_DELL_NETBOOKS) += dell-led.o
		obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o
		obj-$(CONFIG_LEDS_NS2) += leds-ns2.o
		obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o

		# LED SPI Drivers
		obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o

drivers/leds/leds-netxbig.c

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		/*
		* leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs
		*
		* Copyright (C) 2010 LaCie
		*
		* Author: Simon Guinot <sguinot@lacie.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*/

		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/irq.h>
		#include <linux/slab.h>
		#include <linux/spinlock.h>
		#include <linux/platform_device.h>
		#include <linux/gpio.h>
		#include <linux/leds.h>
		#include <mach/leds-netxbig.h>

		/*
		* GPIO extension bus.
		*/

		static DEFINE_SPINLOCK(gpio_ext_lock);

		static void gpio_ext_set_addr(struct netxbig_gpio_ext *gpio_ext, int addr)
		{
		int pin;

		for (pin = 0; pin < gpio_ext->num_addr; pin++)
		gpio_set_value(gpio_ext->addr[pin], (addr >> pin) & 1);
		}

		static void gpio_ext_set_data(struct netxbig_gpio_ext *gpio_ext, int data)
		{
		int pin;

		for (pin = 0; pin < gpio_ext->num_data; pin++)
		gpio_set_value(gpio_ext->data[pin], (data >> pin) & 1);
		}

		static void gpio_ext_enable_select(struct netxbig_gpio_ext *gpio_ext)
		{
		/* Enable select is done on the raising edge. */
		gpio_set_value(gpio_ext->enable, 0);
		gpio_set_value(gpio_ext->enable, 1);
		}

		static void gpio_ext_set_value(struct netxbig_gpio_ext *gpio_ext,
		int addr, int value)
		{
		unsigned long flags;

		spin_lock_irqsave(&gpio_ext_lock, flags);
		gpio_ext_set_addr(gpio_ext, addr);
		gpio_ext_set_data(gpio_ext, value);
		gpio_ext_enable_select(gpio_ext);
		spin_unlock_irqrestore(&gpio_ext_lock, flags);
		}

		static int __devinit gpio_ext_init(struct netxbig_gpio_ext *gpio_ext)
		{
		int err;
		int i;

		if (unlikely(!gpio_ext))
		return -EINVAL;

		/* Configure address GPIOs. */
		for (i = 0; i < gpio_ext->num_addr; i++) {
		err = gpio_request(gpio_ext->addr[i], "GPIO extension addr");
		if (err)
		goto err_free_addr;
		err = gpio_direction_output(gpio_ext->addr[i], 0);
		if (err) {
		gpio_free(gpio_ext->addr[i]);
		goto err_free_addr;
		}
		}
		/* Configure data GPIOs. */
		for (i = 0; i < gpio_ext->num_data; i++) {
		err = gpio_request(gpio_ext->data[i], "GPIO extension data");
		if (err)
		goto err_free_data;
		err = gpio_direction_output(gpio_ext->data[i], 0);
		if (err) {
		gpio_free(gpio_ext->data[i]);
		goto err_free_data;
		}
		}
		/* Configure "enable select" GPIO. */
		err = gpio_request(gpio_ext->enable, "GPIO extension enable");
		if (err)
		goto err_free_data;
		err = gpio_direction_output(gpio_ext->enable, 0);
		if (err) {
		gpio_free(gpio_ext->enable);
		goto err_free_data;
		}

		return 0;

		err_free_data:
		for (i = i - 1; i >= 0; i--)
		gpio_free(gpio_ext->data[i]);
		i = gpio_ext->num_addr;
		err_free_addr:
		for (i = i - 1; i >= 0; i--)
		gpio_free(gpio_ext->addr[i]);

		return err;
		}

		static void __devexit gpio_ext_free(struct netxbig_gpio_ext *gpio_ext)
		{
		int i;

		gpio_free(gpio_ext->enable);
		for (i = gpio_ext->num_addr - 1; i >= 0; i--)
		gpio_free(gpio_ext->addr[i]);
		for (i = gpio_ext->num_data - 1; i >= 0; i--)
		gpio_free(gpio_ext->data[i]);
		}

		/*
		* Class LED driver.
		*/

		struct netxbig_led_data {
		struct netxbig_gpio_ext *gpio_ext;
		struct led_classdev cdev;
		int mode_addr;
		int *mode_val;
		int bright_addr;
		int bright_max;
		struct netxbig_led_timer *timer;
		int num_timer;
		enum netxbig_led_mode mode;
		int sata;
		spinlock_t lock;
		};

		static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode,
		unsigned long delay_on,
		unsigned long delay_off,
		struct netxbig_led_timer *timer,
		int num_timer)
		{
		int i;

		for (i = 0; i < num_timer; i++) {
		if (timer[i].delay_on == delay_on &&
		timer[i].delay_off == delay_off) {
		*mode = timer[i].mode;
		return 0;
		}
		}
		return -EINVAL;
		}

		static int netxbig_led_blink_set(struct led_classdev *led_cdev,
		unsigned long *delay_on,
		unsigned long *delay_off)
		{
		struct netxbig_led_data *led_dat =
		container_of(led_cdev, struct netxbig_led_data, cdev);
		enum netxbig_led_mode mode;
		int mode_val;
		int ret;

		/* Look for a LED mode with the requested timer frequency. */
		ret = netxbig_led_get_timer_mode(&mode, delay_on, delay_off,
		led_dat->timer, led_dat->num_timer);
		if (ret < 0)
		return ret;

		mode_val = led_dat->mode_val[mode];
		if (mode_val == NETXBIG_LED_INVALID_MODE)
		return -EINVAL;

		spin_lock_irq(&led_dat->lock);

		gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
		led_dat->mode = mode;

		spin_unlock_irq(&led_dat->lock);

		return 0;
		}

		static void netxbig_led_set(struct led_classdev *led_cdev,
		enum led_brightness value)
		{
		struct netxbig_led_data *led_dat =
		container_of(led_cdev, struct netxbig_led_data, cdev);
		enum netxbig_led_mode mode;
		int mode_val, bright_val;
		int set_brightness = 1;
		unsigned long flags;

		spin_lock_irqsave(&led_dat->lock, flags);

		if (value == LED_OFF) {
		mode = NETXBIG_LED_OFF;
		set_brightness = 0;
		} else {
		if (led_dat->sata)
		mode = NETXBIG_LED_SATA;
		else if (led_dat->mode == NETXBIG_LED_OFF)
		mode = NETXBIG_LED_ON;
		else /* Keep 'timer' mode. */
		mode = led_dat->mode;
		}
		mode_val = led_dat->mode_val[mode];

		gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
		led_dat->mode = mode;
		/*
		* Note that the brightness register is shared between all the
		* SATA LEDs. So, change the brightness setting for a single
		* SATA LED will affect all the others.
		*/
		if (set_brightness) {
		bright_val = DIV_ROUND_UP(value * led_dat->bright_max,
		LED_FULL);
		gpio_ext_set_value(led_dat->gpio_ext,
		led_dat->bright_addr, bright_val);
		}

		spin_unlock_irqrestore(&led_dat->lock, flags);
		}

		static ssize_t netxbig_led_sata_store(struct device *dev,
		struct device_attribute *attr,
		const char *buff, size_t count)
		{
		struct led_classdev *led_cdev = dev_get_drvdata(dev);
		struct netxbig_led_data *led_dat =
		container_of(led_cdev, struct netxbig_led_data, cdev);
		unsigned long enable;
		enum netxbig_led_mode mode;
		int mode_val;
		int ret;

		ret = strict_strtoul(buff, 10, &enable);
		if (ret < 0)
		return ret;

		enable = !!enable;

		spin_lock_irq(&led_dat->lock);

		if (led_dat->sata == enable) {
		ret = count;
		goto exit_unlock;
		}

		if (led_dat->mode != NETXBIG_LED_ON &&
		led_dat->mode != NETXBIG_LED_SATA)
		mode = led_dat->mode; /* Keep modes 'off' and 'timer'. */
		else if (enable)
		mode = NETXBIG_LED_SATA;
		else
		mode = NETXBIG_LED_ON;

		mode_val = led_dat->mode_val[mode];
		if (mode_val == NETXBIG_LED_INVALID_MODE) {
		ret = -EINVAL;
		goto exit_unlock;
		}

		gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
		led_dat->mode = mode;
		led_dat->sata = enable;

		ret = count;

		exit_unlock:
		spin_unlock_irq(&led_dat->lock);

		return ret;
		}

		static ssize_t netxbig_led_sata_show(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct led_classdev *led_cdev = dev_get_drvdata(dev);
		struct netxbig_led_data *led_dat =
		container_of(led_cdev, struct netxbig_led_data, cdev);

		return sprintf(buf, "%d\n", led_dat->sata);
		}

		static DEVICE_ATTR(sata, 0644, netxbig_led_sata_show, netxbig_led_sata_store);

		static void __devexit delete_netxbig_led(struct netxbig_led_data *led_dat)
		{
		if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
		device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
		led_classdev_unregister(&led_dat->cdev);
		}

		static int __devinit
		create_netxbig_led(struct platform_device *pdev,
		struct netxbig_led_data *led_dat,
		const struct netxbig_led *template)
		{
		struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
		int ret;

		spin_lock_init(&led_dat->lock);
		led_dat->gpio_ext = pdata->gpio_ext;
		led_dat->cdev.name = template->name;
		led_dat->cdev.default_trigger = template->default_trigger;
		led_dat->cdev.blink_set = netxbig_led_blink_set;
		led_dat->cdev.brightness_set = netxbig_led_set;
		/*
		* Because the GPIO extension bus don't allow to read registers
		* value, there is no way to probe the LED initial state.
		* So, the initial sysfs LED value for the "brightness" and "sata"
		* attributes are inconsistent.
		*
		* Note that the initial LED state can't be reconfigured.
		* The reason is that the LED behaviour must stay uniform during
		* the whole boot process (bootloader+linux).
		*/
		led_dat->sata = 0;
		led_dat->cdev.brightness = LED_OFF;
		led_dat->cdev.flags \|= LED_CORE_SUSPENDRESUME;
		led_dat->mode_addr = template->mode_addr;
		led_dat->mode_val = template->mode_val;
		led_dat->bright_addr = template->bright_addr;
		led_dat->bright_max = (1 << pdata->gpio_ext->num_data) - 1;
		led_dat->timer = pdata->timer;
		led_dat->num_timer = pdata->num_timer;

		ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
		if (ret < 0)
		return ret;

		/*
		* If available, expose the SATA activity blink capability through
		* a "sata" sysfs attribute.
		*/
		if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE) {
		ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
		if (ret)
		led_classdev_unregister(&led_dat->cdev);
		}

		return ret;
		}

		static int __devinit netxbig_led_probe(struct platform_device *pdev)
		{
		struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
		struct netxbig_led_data *leds_data;
		int i;
		int ret;

		if (!pdata)
		return -EINVAL;

		leds_data = kzalloc(sizeof(struct netxbig_led_data) * pdata->num_leds,
		GFP_KERNEL);
		if (!leds_data)
		return -ENOMEM;

		ret = gpio_ext_init(pdata->gpio_ext);
		if (ret < 0)
		goto err_free_data;

		for (i = 0; i < pdata->num_leds; i++) {
		ret = create_netxbig_led(pdev, &leds_data[i], &pdata->leds[i]);
		if (ret < 0)
		goto err_free_leds;
		}

		platform_set_drvdata(pdev, leds_data);

		return 0;

		err_free_leds:
		for (i = i - 1; i >= 0; i--)
		delete_netxbig_led(&leds_data[i]);

		gpio_ext_free(pdata->gpio_ext);
		err_free_data:
		kfree(leds_data);

		return ret;
		}

		static int __devexit netxbig_led_remove(struct platform_device *pdev)
		{
		struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
		struct netxbig_led_data *leds_data;
		int i;

		leds_data = platform_get_drvdata(pdev);

		for (i = 0; i < pdata->num_leds; i++)
		delete_netxbig_led(&leds_data[i]);

		gpio_ext_free(pdata->gpio_ext);
		kfree(leds_data);

		return 0;
		}

		static struct platform_driver netxbig_led_driver = {
		.probe = netxbig_led_probe,
		.remove = __devexit_p(netxbig_led_remove),
		.driver = {
		.name = "leds-netxbig",
		.owner = THIS_MODULE,
		},
		};
		MODULE_ALIAS("platform:leds-netxbig");

		static int __init netxbig_led_init(void)
		{
		return platform_driver_register(&netxbig_led_driver);
		}

		static void __exit netxbig_led_exit(void)
		{
		platform_driver_unregister(&netxbig_led_driver);
		}

		module_init(netxbig_led_init);
		module_exit(netxbig_led_exit);

		MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
		MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards");
		MODULE_LICENSE("GPL");