2 * leds-ns2.c - Driver for the Network Space v2 (and parents) dual-GPIO LED
4 * Copyright (C) 2010 LaCie
6 * Author: Simon Guinot <sguinot@lacie.com>
8 * Based on leds-gpio.c by Raphael Assenat <raph@8d.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <linux/kernel.h>
26 #include <linux/init.h>
27 #include <linux/platform_device.h>
28 #include <linux/slab.h>
29 #include <linux/gpio.h>
30 #include <linux/leds.h>
31 #include <linux/module.h>
32 #include <linux/platform_data/leds-kirkwood-ns2.h>
35 * The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in
36 * relation with the SATA activity. This capability is exposed through the
37 * "sata" sysfs attribute.
39 * The following array detail the different LED registers and the combination
40 * of their possible values:
42 * cmd_led | slow_led | /SATA active | LED state
47 * 0 | 0 | 0 | blink (rate 300ms)
56 struct ns2_led_mode_value {
57 enum ns2_led_modes mode;
62 static struct ns2_led_mode_value ns2_led_modval[] = {
63 { NS_V2_LED_OFF , 1, 0 },
64 { NS_V2_LED_ON , 0, 1 },
65 { NS_V2_LED_ON , 1, 1 },
66 { NS_V2_LED_SATA, 0, 0 },
70 struct led_classdev cdev;
73 unsigned char sata; /* True when SATA mode active. */
74 rwlock_t rw_lock; /* Lock GPIOs. */
77 static int ns2_led_get_mode(struct ns2_led_data *led_dat,
78 enum ns2_led_modes *mode)
85 read_lock_irq(&led_dat->rw_lock);
87 cmd_level = gpio_get_value(led_dat->cmd);
88 slow_level = gpio_get_value(led_dat->slow);
90 for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
91 if (cmd_level == ns2_led_modval[i].cmd_level &&
92 slow_level == ns2_led_modval[i].slow_level) {
93 *mode = ns2_led_modval[i].mode;
99 read_unlock_irq(&led_dat->rw_lock);
104 static void ns2_led_set_mode(struct ns2_led_data *led_dat,
105 enum ns2_led_modes mode)
110 write_lock_irqsave(&led_dat->rw_lock, flags);
112 for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
113 if (mode == ns2_led_modval[i].mode) {
114 gpio_set_value(led_dat->cmd,
115 ns2_led_modval[i].cmd_level);
116 gpio_set_value(led_dat->slow,
117 ns2_led_modval[i].slow_level);
121 write_unlock_irqrestore(&led_dat->rw_lock, flags);
124 static void ns2_led_set(struct led_classdev *led_cdev,
125 enum led_brightness value)
127 struct ns2_led_data *led_dat =
128 container_of(led_cdev, struct ns2_led_data, cdev);
129 enum ns2_led_modes mode;
131 if (value == LED_OFF)
132 mode = NS_V2_LED_OFF;
133 else if (led_dat->sata)
134 mode = NS_V2_LED_SATA;
138 ns2_led_set_mode(led_dat, mode);
141 static ssize_t ns2_led_sata_store(struct device *dev,
142 struct device_attribute *attr,
143 const char *buff, size_t count)
145 struct led_classdev *led_cdev = dev_get_drvdata(dev);
146 struct ns2_led_data *led_dat =
147 container_of(led_cdev, struct ns2_led_data, cdev);
149 unsigned long enable;
150 enum ns2_led_modes mode;
152 ret = kstrtoul(buff, 10, &enable);
158 if (led_dat->sata == enable)
161 ret = ns2_led_get_mode(led_dat, &mode);
165 if (enable && mode == NS_V2_LED_ON)
166 ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
167 if (!enable && mode == NS_V2_LED_SATA)
168 ns2_led_set_mode(led_dat, NS_V2_LED_ON);
170 led_dat->sata = enable;
175 static ssize_t ns2_led_sata_show(struct device *dev,
176 struct device_attribute *attr, char *buf)
178 struct led_classdev *led_cdev = dev_get_drvdata(dev);
179 struct ns2_led_data *led_dat =
180 container_of(led_cdev, struct ns2_led_data, cdev);
182 return sprintf(buf, "%d\n", led_dat->sata);
185 static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
188 create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
189 const struct ns2_led *template)
192 enum ns2_led_modes mode;
194 ret = devm_gpio_request_one(&pdev->dev, template->cmd,
195 GPIOF_DIR_OUT | gpio_get_value(template->cmd),
198 dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
203 ret = devm_gpio_request_one(&pdev->dev, template->slow,
204 GPIOF_DIR_OUT | gpio_get_value(template->slow),
207 dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
212 rwlock_init(&led_dat->rw_lock);
214 led_dat->cdev.name = template->name;
215 led_dat->cdev.default_trigger = template->default_trigger;
216 led_dat->cdev.blink_set = NULL;
217 led_dat->cdev.brightness_set = ns2_led_set;
218 led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
219 led_dat->cmd = template->cmd;
220 led_dat->slow = template->slow;
222 ret = ns2_led_get_mode(led_dat, &mode);
226 /* Set LED initial state. */
227 led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
228 led_dat->cdev.brightness =
229 (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
231 ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
235 ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
242 led_classdev_unregister(&led_dat->cdev);
246 static void delete_ns2_led(struct ns2_led_data *led_dat)
248 device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
249 led_classdev_unregister(&led_dat->cdev);
252 static int __devinit ns2_led_probe(struct platform_device *pdev)
254 struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
255 struct ns2_led_data *leds_data;
262 leds_data = devm_kzalloc(&pdev->dev, sizeof(struct ns2_led_data) *
263 pdata->num_leds, GFP_KERNEL);
267 for (i = 0; i < pdata->num_leds; i++) {
268 ret = create_ns2_led(pdev, &leds_data[i], &pdata->leds[i]);
270 for (i = i - 1; i >= 0; i--)
271 delete_ns2_led(&leds_data[i]);
276 platform_set_drvdata(pdev, leds_data);
281 static int __devexit ns2_led_remove(struct platform_device *pdev)
284 struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
285 struct ns2_led_data *leds_data;
287 leds_data = platform_get_drvdata(pdev);
289 for (i = 0; i < pdata->num_leds; i++)
290 delete_ns2_led(&leds_data[i]);
292 platform_set_drvdata(pdev, NULL);
297 static struct platform_driver ns2_led_driver = {
298 .probe = ns2_led_probe,
299 .remove = __devexit_p(ns2_led_remove),
302 .owner = THIS_MODULE,
306 module_platform_driver(ns2_led_driver);
308 MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
309 MODULE_DESCRIPTION("Network Space v2 LED driver");
310 MODULE_LICENSE("GPL");
311 MODULE_ALIAS("platform:leds-ns2");