| /* |
| * 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 <linux/module.h> |
| #include <linux/platform_data/leds-kirkwood-ns2.h> |
| #include <linux/of_gpio.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_irq(&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_irq(&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; |
| unsigned long flags; |
| |
| write_lock_irqsave(&led_dat->rw_lock, flags); |
| |
| 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_irqrestore(&led_dat->rw_lock, flags); |
| } |
| |
| 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) |
| { |
| struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| struct ns2_led_data *led_dat = |
| container_of(led_cdev, struct ns2_led_data, cdev); |
| int ret; |
| unsigned long enable; |
| enum ns2_led_modes mode; |
| |
| 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 led_classdev *led_cdev = dev_get_drvdata(dev); |
| struct ns2_led_data *led_dat = |
| container_of(led_cdev, struct ns2_led_data, cdev); |
| |
| return sprintf(buf, "%d\n", led_dat->sata); |
| } |
| |
| static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store); |
| |
| static int |
| 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; |
| |
| 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 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); |
| } |
| |
| #ifdef CONFIG_OF_GPIO |
| /* |
| * Translate OpenFirmware node properties into platform_data. |
| */ |
| static int |
| ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata) |
| { |
| struct device_node *np = dev->of_node; |
| struct device_node *child; |
| struct ns2_led *leds; |
| int num_leds = 0; |
| int i = 0; |
| |
| num_leds = of_get_child_count(np); |
| if (!num_leds) |
| return -ENODEV; |
| |
| leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led), |
| GFP_KERNEL); |
| if (!leds) |
| return -ENOMEM; |
| |
| for_each_child_of_node(np, child) { |
| const char *string; |
| int ret; |
| |
| ret = of_get_named_gpio(child, "cmd-gpio", 0); |
| if (ret < 0) |
| return ret; |
| leds[i].cmd = ret; |
| ret = of_get_named_gpio(child, "slow-gpio", 0); |
| if (ret < 0) |
| return ret; |
| leds[i].slow = ret; |
| ret = of_property_read_string(child, "label", &string); |
| leds[i].name = (ret == 0) ? string : child->name; |
| ret = of_property_read_string(child, "linux,default-trigger", |
| &string); |
| if (ret == 0) |
| leds[i].default_trigger = string; |
| |
| i++; |
| } |
| |
| pdata->leds = leds; |
| pdata->num_leds = num_leds; |
| |
| return 0; |
| } |
| |
| static const struct of_device_id of_ns2_leds_match[] = { |
| { .compatible = "lacie,ns2-leds", }, |
| {}, |
| }; |
| #endif /* CONFIG_OF_GPIO */ |
| |
| static int 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; |
| |
| #ifdef CONFIG_OF_GPIO |
| if (!pdata) { |
| pdata = devm_kzalloc(&pdev->dev, |
| sizeof(struct ns2_led_platform_data), |
| GFP_KERNEL); |
| if (!pdata) |
| return -ENOMEM; |
| |
| ret = ns2_leds_get_of_pdata(&pdev->dev, pdata); |
| if (ret) |
| return ret; |
| } |
| #else |
| if (!pdata) |
| return -EINVAL; |
| #endif /* CONFIG_OF_GPIO */ |
| |
| leds_data = devm_kzalloc(&pdev->dev, 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) { |
| for (i = i - 1; i >= 0; i--) |
| delete_ns2_led(&leds_data[i]); |
| return ret; |
| } |
| } |
| |
| platform_set_drvdata(pdev, leds_data); |
| |
| return 0; |
| } |
| |
| static int 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]); |
| |
| platform_set_drvdata(pdev, NULL); |
| |
| return 0; |
| } |
| |
| static struct platform_driver ns2_led_driver = { |
| .probe = ns2_led_probe, |
| .remove = ns2_led_remove, |
| .driver = { |
| .name = "leds-ns2", |
| .owner = THIS_MODULE, |
| .of_match_table = of_match_ptr(of_ns2_leds_match), |
| }, |
| }; |
| |
| module_platform_driver(ns2_led_driver); |
| |
| MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>"); |
| MODULE_DESCRIPTION("Network Space v2 LED driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:leds-ns2"); |