leds: add LED driver for Network Space v2 LEDs (11efe71f) · Commits · e / devices / android_kernel_fairphone_FP3

arch/arm/mach-kirkwood/include/mach/leds-ns2.h

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		/*
		* arch/arm/mach-kirkwood/include/mach/leds-ns2.h
		*
		* Platform data structure for Network Space v2 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_NS2_H
		#define __MACH_LEDS_NS2_H

		struct ns2_led {
		const char *name;
		const char *default_trigger;
		unsigned cmd;
		unsigned slow;
		};

		struct ns2_led_platform_data {
		int num_leds;
		struct ns2_led *leds;
		};

		#endif /* __MACH_LEDS_NS2_H */

drivers/leds/Kconfig

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		@@ -302,6 +302,15 @@ config LEDS_MC13783
		This option enable support for on-chip LED drivers found
		on Freescale Semiconductor MC13783 PMIC.

		config LEDS_NS2
		tristate "LED support for Network Space v2 GPIO LEDs"
		depends on MACH_NETSPACE_V2 \|\| MACH_INETSPACE_V2 \|\| MACH_NETSPACE_MAX_V2
		default y
		help
		This option enable support for the dual-GPIO LED found on the
		Network Space v2 board (and parents). This include Internet Space v2,
		Network Space (Max) v2 and d2 Network v2 boards.

		config LEDS_TRIGGERS
		bool "LED Trigger support"
		help

drivers/leds/Makefile

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		@@ -37,6 +37,7 @@ obj-$(CONFIG_LEDS_LT3593) += leds-lt3593.o
		obj-$(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

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

drivers/leds/leds-ns2.c

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		/*
		* leds-ns2.c - Driver for the Network Space v2 (and parents) dual-GPIO LED
		*
		* Copyright (C) 2010 LaCie
		*
		* Author: Simon Guinot <sguinot@lacie.com>
		*
		* Based on leds-gpio.c by Raphael Assenat <raph@8d.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/kernel.h>
		#include <linux/init.h>
		#include <linux/platform_device.h>
		#include <linux/slab.h>
		#include <linux/gpio.h>
		#include <linux/leds.h>
		#include <mach/leds-ns2.h>

		/*
		* The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in
		* relation with the SATA activity. This capability is exposed through the
		* "sata" sysfs attribute.
		*
		* The following array detail the different LED registers and the combination
		* of their possible values:
		*
		* cmd_led \| slow_led \| /SATA active \| LED state
		* \| \| \|
		* 1 \| 0 \| x \| off
		* - \| 1 \| x \| on
		* 0 \| 0 \| 1 \| on
		* 0 \| 0 \| 0 \| blink (rate 300ms)
		*/

		enum ns2_led_modes {
		NS_V2_LED_OFF,
		NS_V2_LED_ON,
		NS_V2_LED_SATA,
		};

		struct ns2_led_mode_value {
		enum ns2_led_modes mode;
		int cmd_level;
		int slow_level;
		};

		static struct ns2_led_mode_value ns2_led_modval[] = {
		{ NS_V2_LED_OFF , 1, 0 },
		{ NS_V2_LED_ON , 0, 1 },
		{ NS_V2_LED_ON , 1, 1 },
		{ NS_V2_LED_SATA, 0, 0 },
		};

		struct ns2_led_data {
		struct led_classdev cdev;
		unsigned cmd;
		unsigned slow;
		unsigned char sata; /* True when SATA mode active. */
		rwlock_t rw_lock; /* Lock GPIOs. */
		};

		static int ns2_led_get_mode(struct ns2_led_data *led_dat,
		enum ns2_led_modes *mode)
		{
		int i;
		int ret = -EINVAL;
		int cmd_level;
		int slow_level;

		read_lock(&led_dat->rw_lock);

		cmd_level = gpio_get_value(led_dat->cmd);
		slow_level = gpio_get_value(led_dat->slow);

		for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
		if (cmd_level == ns2_led_modval[i].cmd_level &&
		slow_level == ns2_led_modval[i].slow_level) {
		*mode = ns2_led_modval[i].mode;
		ret = 0;
		break;
		}
		}

		read_unlock(&led_dat->rw_lock);

		return ret;
		}

		static void ns2_led_set_mode(struct ns2_led_data *led_dat,
		enum ns2_led_modes mode)
		{
		int i;

		write_lock(&led_dat->rw_lock);

		for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
		if (mode == ns2_led_modval[i].mode) {
		gpio_set_value(led_dat->cmd,
		ns2_led_modval[i].cmd_level);
		gpio_set_value(led_dat->slow,
		ns2_led_modval[i].slow_level);
		}
		}

		write_unlock(&led_dat->rw_lock);
		}

		static void ns2_led_set(struct led_classdev *led_cdev,
		enum led_brightness value)
		{
		struct ns2_led_data *led_dat =
		container_of(led_cdev, struct ns2_led_data, cdev);
		enum ns2_led_modes mode;

		if (value == LED_OFF)
		mode = NS_V2_LED_OFF;
		else if (led_dat->sata)
		mode = NS_V2_LED_SATA;
		else
		mode = NS_V2_LED_ON;

		ns2_led_set_mode(led_dat, mode);
		}

		static ssize_t ns2_led_sata_store(struct device *dev,
		struct device_attribute *attr,
		const char *buff, size_t count)
		{
		int ret;
		unsigned long enable;
		enum ns2_led_modes mode;
		struct ns2_led_data *led_dat = dev_get_drvdata(dev);

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

		enable = !!enable;

		if (led_dat->sata == enable)
		return count;

		ret = ns2_led_get_mode(led_dat, &mode);
		if (ret < 0)
		return ret;

		if (enable && mode == NS_V2_LED_ON)
		ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
		if (!enable && mode == NS_V2_LED_SATA)
		ns2_led_set_mode(led_dat, NS_V2_LED_ON);

		led_dat->sata = enable;

		return count;
		}

		static ssize_t ns2_led_sata_show(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct ns2_led_data *led_dat = dev_get_drvdata(dev);

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

		static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);

		static int __devinit
		create_ns2_led(struct platform_device pdev, struct ns2_led_data led_dat,
		const struct ns2_led *template)
		{
		int ret;
		enum ns2_led_modes mode;

		ret = gpio_request(template->cmd, template->name);
		if (ret == 0) {
		ret = gpio_direction_output(template->cmd,
		gpio_get_value(template->cmd));
		if (ret)
		gpio_free(template->cmd);
		}
		if (ret) {
		dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
		template->name);
		}

		ret = gpio_request(template->slow, template->name);
		if (ret == 0) {
		ret = gpio_direction_output(template->slow,
		gpio_get_value(template->slow));
		if (ret)
		gpio_free(template->slow);
		}
		if (ret) {
		dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
		template->name);
		goto err_free_cmd;
		}

		rwlock_init(&led_dat->rw_lock);

		led_dat->cdev.name = template->name;
		led_dat->cdev.default_trigger = template->default_trigger;
		led_dat->cdev.blink_set = NULL;
		led_dat->cdev.brightness_set = ns2_led_set;
		led_dat->cdev.flags \|= LED_CORE_SUSPENDRESUME;
		led_dat->cmd = template->cmd;
		led_dat->slow = template->slow;

		ret = ns2_led_get_mode(led_dat, &mode);
		if (ret < 0)
		goto err_free_slow;

		/* Set LED initial state. */
		led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
		led_dat->cdev.brightness =
		(mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;

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

		dev_set_drvdata(led_dat->cdev.dev, led_dat);
		ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
		if (ret < 0)
		goto err_free_cdev;

		return 0;

		err_free_cdev:
		led_classdev_unregister(&led_dat->cdev);
		err_free_slow:
		gpio_free(led_dat->slow);
		err_free_cmd:
		gpio_free(led_dat->cmd);

		return ret;
		}

		static void __devexit delete_ns2_led(struct ns2_led_data *led_dat)
		{
		device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
		led_classdev_unregister(&led_dat->cdev);
		gpio_free(led_dat->cmd);
		gpio_free(led_dat->slow);
		}

		static int __devinit ns2_led_probe(struct platform_device *pdev)
		{
		struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
		struct ns2_led_data *leds_data;
		int i;
		int ret;

		if (!pdata)
		return -EINVAL;

		leds_data = kzalloc(sizeof(struct ns2_led_data) *
		pdata->num_leds, GFP_KERNEL);
		if (!leds_data)
		return -ENOMEM;

		for (i = 0; i < pdata->num_leds; i++) {
		ret = create_ns2_led(pdev, &leds_data[i], &pdata->leds[i]);
		if (ret < 0)
		goto err;

		}

		platform_set_drvdata(pdev, leds_data);

		return 0;

		err:
		for (i = i - 1; i >= 0; i--)
		delete_ns2_led(&leds_data[i]);

		kfree(leds_data);

		return ret;
		}

		static int __devexit ns2_led_remove(struct platform_device *pdev)
		{
		int i;
		struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
		struct ns2_led_data *leds_data;

		leds_data = platform_get_drvdata(pdev);

		for (i = 0; i < pdata->num_leds; i++)
		delete_ns2_led(&leds_data[i]);

		kfree(leds_data);
		platform_set_drvdata(pdev, NULL);

		return 0;
		}

		static struct platform_driver ns2_led_driver = {
		.probe = ns2_led_probe,
		.remove = __devexit_p(ns2_led_remove),
		.driver = {
		.name = "leds-ns2",
		.owner = THIS_MODULE,
		},
		};
		MODULE_ALIAS("platform:leds-ns2");

		static int __init ns2_led_init(void)
		{
		return platform_driver_register(&ns2_led_driver);
		}

		static void __exit ns2_led_exit(void)
		{
		platform_driver_unregister(&ns2_led_driver);
		}

		module_init(ns2_led_init);
		module_exit(ns2_led_exit);

		MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
		MODULE_DESCRIPTION("Network Space v2 LED driver");
		MODULE_LICENSE("GPL");