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/platform_device.h>
27 #include <linux/slab.h>
28 #include <linux/gpio.h>
29 #include <linux/leds.h>
30 #include <linux/module.h>
31 #include <linux/platform_data/leds-kirkwood-ns2.h>
33 #include <linux/of_gpio.h>
36 * The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in
37 * relation with the SATA activity. This capability is exposed through the
38 * "sata" sysfs attribute.
40 * The following array detail the different LED registers and the combination
41 * of their possible values:
43 * cmd_led | slow_led | /SATA active | LED state
48 * 0 | 0 | 0 | blink (rate 300ms)
57 struct ns2_led_mode_value {
58 enum ns2_led_modes mode;
63 static struct ns2_led_mode_value ns2_led_modval[] = {
64 { NS_V2_LED_OFF , 1, 0 },
65 { NS_V2_LED_ON , 0, 1 },
66 { NS_V2_LED_ON , 1, 1 },
67 { NS_V2_LED_SATA, 0, 0 },
71 struct led_classdev cdev;
74 unsigned char sata; /* True when SATA mode active. */
75 rwlock_t rw_lock; /* Lock GPIOs. */
78 static int ns2_led_get_mode(struct ns2_led_data *led_dat,
79 enum ns2_led_modes *mode)
86 read_lock_irq(&led_dat->rw_lock);
88 cmd_level = gpio_get_value(led_dat->cmd);
89 slow_level = gpio_get_value(led_dat->slow);
91 for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
92 if (cmd_level == ns2_led_modval[i].cmd_level &&
93 slow_level == ns2_led_modval[i].slow_level) {
94 *mode = ns2_led_modval[i].mode;
100 read_unlock_irq(&led_dat->rw_lock);
105 static void ns2_led_set_mode(struct ns2_led_data *led_dat,
106 enum ns2_led_modes mode)
111 write_lock_irqsave(&led_dat->rw_lock, flags);
113 for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
114 if (mode == ns2_led_modval[i].mode) {
115 gpio_set_value(led_dat->cmd,
116 ns2_led_modval[i].cmd_level);
117 gpio_set_value(led_dat->slow,
118 ns2_led_modval[i].slow_level);
122 write_unlock_irqrestore(&led_dat->rw_lock, flags);
125 static void ns2_led_set(struct led_classdev *led_cdev,
126 enum led_brightness value)
128 struct ns2_led_data *led_dat =
129 container_of(led_cdev, struct ns2_led_data, cdev);
130 enum ns2_led_modes mode;
132 if (value == LED_OFF)
133 mode = NS_V2_LED_OFF;
134 else if (led_dat->sata)
135 mode = NS_V2_LED_SATA;
139 ns2_led_set_mode(led_dat, mode);
142 static ssize_t ns2_led_sata_store(struct device *dev,
143 struct device_attribute *attr,
144 const char *buff, size_t count)
146 struct led_classdev *led_cdev = dev_get_drvdata(dev);
147 struct ns2_led_data *led_dat =
148 container_of(led_cdev, struct ns2_led_data, cdev);
150 unsigned long enable;
151 enum ns2_led_modes mode;
153 ret = kstrtoul(buff, 10, &enable);
159 if (led_dat->sata == enable)
162 ret = ns2_led_get_mode(led_dat, &mode);
166 if (enable && mode == NS_V2_LED_ON)
167 ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
168 if (!enable && mode == NS_V2_LED_SATA)
169 ns2_led_set_mode(led_dat, NS_V2_LED_ON);
171 led_dat->sata = enable;
176 static ssize_t ns2_led_sata_show(struct device *dev,
177 struct device_attribute *attr, char *buf)
179 struct led_classdev *led_cdev = dev_get_drvdata(dev);
180 struct ns2_led_data *led_dat =
181 container_of(led_cdev, struct ns2_led_data, cdev);
183 return sprintf(buf, "%d\n", led_dat->sata);
186 static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
188 static struct attribute *ns2_led_attrs[] = {
192 ATTRIBUTE_GROUPS(ns2_led);
195 create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
196 const struct ns2_led *template)
199 enum ns2_led_modes mode;
201 ret = devm_gpio_request_one(&pdev->dev, template->cmd,
202 gpio_get_value(template->cmd) ?
203 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
206 dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
211 ret = devm_gpio_request_one(&pdev->dev, template->slow,
212 gpio_get_value(template->slow) ?
213 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
216 dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
221 rwlock_init(&led_dat->rw_lock);
223 led_dat->cdev.name = template->name;
224 led_dat->cdev.default_trigger = template->default_trigger;
225 led_dat->cdev.blink_set = NULL;
226 led_dat->cdev.brightness_set = ns2_led_set;
227 led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
228 led_dat->cdev.groups = ns2_led_groups;
229 led_dat->cmd = template->cmd;
230 led_dat->slow = template->slow;
232 ret = ns2_led_get_mode(led_dat, &mode);
236 /* Set LED initial state. */
237 led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
238 led_dat->cdev.brightness =
239 (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
241 ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
248 static void delete_ns2_led(struct ns2_led_data *led_dat)
250 led_classdev_unregister(&led_dat->cdev);
253 #ifdef CONFIG_OF_GPIO
255 * Translate OpenFirmware node properties into platform_data.
258 ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata)
260 struct device_node *np = dev->of_node;
261 struct device_node *child;
262 struct ns2_led *leds;
266 num_leds = of_get_child_count(np);
270 leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led),
275 for_each_child_of_node(np, child) {
279 ret = of_get_named_gpio(child, "cmd-gpio", 0);
283 ret = of_get_named_gpio(child, "slow-gpio", 0);
287 ret = of_property_read_string(child, "label", &string);
288 leds[i].name = (ret == 0) ? string : child->name;
289 ret = of_property_read_string(child, "linux,default-trigger",
292 leds[i].default_trigger = string;
298 pdata->num_leds = num_leds;
303 static const struct of_device_id of_ns2_leds_match[] = {
304 { .compatible = "lacie,ns2-leds", },
307 #endif /* CONFIG_OF_GPIO */
309 struct ns2_led_priv {
311 struct ns2_led_data leds_data[];
314 static inline int sizeof_ns2_led_priv(int num_leds)
316 return sizeof(struct ns2_led_priv) +
317 (sizeof(struct ns2_led_data) * num_leds);
320 static int ns2_led_probe(struct platform_device *pdev)
322 struct ns2_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
323 struct ns2_led_priv *priv;
327 #ifdef CONFIG_OF_GPIO
329 pdata = devm_kzalloc(&pdev->dev,
330 sizeof(struct ns2_led_platform_data),
335 ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
342 #endif /* CONFIG_OF_GPIO */
344 priv = devm_kzalloc(&pdev->dev,
345 sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
348 priv->num_leds = pdata->num_leds;
350 for (i = 0; i < priv->num_leds; i++) {
351 ret = create_ns2_led(pdev, &priv->leds_data[i],
354 for (i = i - 1; i >= 0; i--)
355 delete_ns2_led(&priv->leds_data[i]);
360 platform_set_drvdata(pdev, priv);
365 static int ns2_led_remove(struct platform_device *pdev)
368 struct ns2_led_priv *priv;
370 priv = platform_get_drvdata(pdev);
372 for (i = 0; i < priv->num_leds; i++)
373 delete_ns2_led(&priv->leds_data[i]);
378 static struct platform_driver ns2_led_driver = {
379 .probe = ns2_led_probe,
380 .remove = ns2_led_remove,
383 .owner = THIS_MODULE,
384 .of_match_table = of_match_ptr(of_ns2_leds_match),
388 module_platform_driver(ns2_led_driver);
390 MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
391 MODULE_DESCRIPTION("Network Space v2 LED driver");
392 MODULE_LICENSE("GPL");
393 MODULE_ALIAS("platform:leds-ns2");