1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * leds-ns2.c - Driver for the Network Space v2 (and parents) dual-GPIO LED
5 * Copyright (C) 2010 LaCie
12 #include <linux/kernel.h>
13 #include <linux/platform_device.h>
14 #include <linux/slab.h>
15 #include <linux/gpio.h>
16 #include <linux/leds.h>
17 #include <linux/module.h>
18 #include <linux/platform_data/leds-kirkwood-ns2.h>
20 #include <linux/of_gpio.h>
24 * The Network Space v2 dual-GPIO LED is wired to a CPLD. Three different LED
25 * modes are available: off, on and SATA activity blinking. The LED modes are
26 * controlled through two GPIOs (command and slow): each combination of values
27 * for the command/slow GPIOs corresponds to a LED mode.
31 struct led_classdev cdev;
35 unsigned char sata; /* True when SATA mode active. */
36 rwlock_t rw_lock; /* Lock GPIOs. */
38 struct ns2_led_modval *modval;
41 static int ns2_led_get_mode(struct ns2_led_data *led_dat,
42 enum ns2_led_modes *mode)
49 cmd_level = gpio_get_value_cansleep(led_dat->cmd);
50 slow_level = gpio_get_value_cansleep(led_dat->slow);
52 for (i = 0; i < led_dat->num_modes; i++) {
53 if (cmd_level == led_dat->modval[i].cmd_level &&
54 slow_level == led_dat->modval[i].slow_level) {
55 *mode = led_dat->modval[i].mode;
64 static void ns2_led_set_mode(struct ns2_led_data *led_dat,
65 enum ns2_led_modes mode)
71 for (i = 0; i < led_dat->num_modes; i++)
72 if (mode == led_dat->modval[i].mode) {
80 write_lock_irqsave(&led_dat->rw_lock, flags);
82 if (!led_dat->can_sleep) {
83 gpio_set_value(led_dat->cmd,
84 led_dat->modval[i].cmd_level);
85 gpio_set_value(led_dat->slow,
86 led_dat->modval[i].slow_level);
90 gpio_set_value_cansleep(led_dat->cmd, led_dat->modval[i].cmd_level);
91 gpio_set_value_cansleep(led_dat->slow, led_dat->modval[i].slow_level);
94 write_unlock_irqrestore(&led_dat->rw_lock, flags);
97 static void ns2_led_set(struct led_classdev *led_cdev,
98 enum led_brightness value)
100 struct ns2_led_data *led_dat =
101 container_of(led_cdev, struct ns2_led_data, cdev);
102 enum ns2_led_modes mode;
104 if (value == LED_OFF)
105 mode = NS_V2_LED_OFF;
106 else if (led_dat->sata)
107 mode = NS_V2_LED_SATA;
111 ns2_led_set_mode(led_dat, mode);
114 static int ns2_led_set_blocking(struct led_classdev *led_cdev,
115 enum led_brightness value)
117 ns2_led_set(led_cdev, value);
121 static ssize_t ns2_led_sata_store(struct device *dev,
122 struct device_attribute *attr,
123 const char *buff, size_t count)
125 struct led_classdev *led_cdev = dev_get_drvdata(dev);
126 struct ns2_led_data *led_dat =
127 container_of(led_cdev, struct ns2_led_data, cdev);
129 unsigned long enable;
131 ret = kstrtoul(buff, 10, &enable);
137 if (led_dat->sata == enable)
140 led_dat->sata = enable;
142 if (!led_get_brightness(led_cdev))
146 ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
148 ns2_led_set_mode(led_dat, NS_V2_LED_ON);
154 static ssize_t ns2_led_sata_show(struct device *dev,
155 struct device_attribute *attr, char *buf)
157 struct led_classdev *led_cdev = dev_get_drvdata(dev);
158 struct ns2_led_data *led_dat =
159 container_of(led_cdev, struct ns2_led_data, cdev);
161 return sprintf(buf, "%d\n", led_dat->sata);
164 static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
166 static struct attribute *ns2_led_attrs[] = {
170 ATTRIBUTE_GROUPS(ns2_led);
173 create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
174 const struct ns2_led *template)
177 enum ns2_led_modes mode;
179 ret = devm_gpio_request_one(&pdev->dev, template->cmd,
180 gpio_get_value_cansleep(template->cmd) ?
181 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
184 dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
189 ret = devm_gpio_request_one(&pdev->dev, template->slow,
190 gpio_get_value_cansleep(template->slow) ?
191 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
194 dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
199 rwlock_init(&led_dat->rw_lock);
201 led_dat->cdev.name = template->name;
202 led_dat->cdev.default_trigger = template->default_trigger;
203 led_dat->cdev.blink_set = NULL;
204 led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
205 led_dat->cdev.groups = ns2_led_groups;
206 led_dat->cmd = template->cmd;
207 led_dat->slow = template->slow;
208 led_dat->can_sleep = gpio_cansleep(led_dat->cmd) |
209 gpio_cansleep(led_dat->slow);
210 if (led_dat->can_sleep)
211 led_dat->cdev.brightness_set_blocking = ns2_led_set_blocking;
213 led_dat->cdev.brightness_set = ns2_led_set;
214 led_dat->modval = template->modval;
215 led_dat->num_modes = template->num_modes;
217 ret = ns2_led_get_mode(led_dat, &mode);
221 /* Set LED initial state. */
222 led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
223 led_dat->cdev.brightness =
224 (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
226 ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
233 static void delete_ns2_led(struct ns2_led_data *led_dat)
235 led_classdev_unregister(&led_dat->cdev);
238 #ifdef CONFIG_OF_GPIO
240 * Translate OpenFirmware node properties into platform_data.
243 ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata)
245 struct device_node *np = dev->of_node;
246 struct device_node *child;
247 struct ns2_led *led, *leds;
248 int ret, num_leds = 0;
250 num_leds = of_get_child_count(np);
254 leds = devm_kcalloc(dev, num_leds, sizeof(struct ns2_led),
260 for_each_child_of_node(np, child) {
263 struct ns2_led_modval *modval;
265 ret = of_get_named_gpio(child, "cmd-gpio", 0);
269 ret = of_get_named_gpio(child, "slow-gpio", 0);
273 ret = of_property_read_string(child, "label", &string);
274 led->name = (ret == 0) ? string : child->name;
275 ret = of_property_read_string(child, "linux,default-trigger",
278 led->default_trigger = string;
280 ret = of_property_count_u32_elems(child, "modes-map");
281 if (ret < 0 || ret % 3) {
283 "Missing or malformed modes-map property\n");
289 modval = devm_kcalloc(dev,
291 sizeof(struct ns2_led_modval),
298 for (i = 0; i < num_modes; i++) {
299 of_property_read_u32_index(child,
301 (u32 *) &modval[i].mode);
302 of_property_read_u32_index(child,
303 "modes-map", 3 * i + 1,
304 (u32 *) &modval[i].cmd_level);
305 of_property_read_u32_index(child,
306 "modes-map", 3 * i + 2,
307 (u32 *) &modval[i].slow_level);
310 led->num_modes = num_modes;
311 led->modval = modval;
317 pdata->num_leds = num_leds;
326 static const struct of_device_id of_ns2_leds_match[] = {
327 { .compatible = "lacie,ns2-leds", },
330 MODULE_DEVICE_TABLE(of, of_ns2_leds_match);
331 #endif /* CONFIG_OF_GPIO */
333 struct ns2_led_priv {
335 struct ns2_led_data leds_data[];
338 static inline int sizeof_ns2_led_priv(int num_leds)
340 return sizeof(struct ns2_led_priv) +
341 (sizeof(struct ns2_led_data) * num_leds);
344 static int ns2_led_probe(struct platform_device *pdev)
346 struct ns2_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
347 struct ns2_led_priv *priv;
351 #ifdef CONFIG_OF_GPIO
353 pdata = devm_kzalloc(&pdev->dev,
354 sizeof(struct ns2_led_platform_data),
359 ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
366 #endif /* CONFIG_OF_GPIO */
368 priv = devm_kzalloc(&pdev->dev,
369 sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
372 priv->num_leds = pdata->num_leds;
374 for (i = 0; i < priv->num_leds; i++) {
375 ret = create_ns2_led(pdev, &priv->leds_data[i],
378 for (i = i - 1; i >= 0; i--)
379 delete_ns2_led(&priv->leds_data[i]);
384 platform_set_drvdata(pdev, priv);
389 static int ns2_led_remove(struct platform_device *pdev)
392 struct ns2_led_priv *priv;
394 priv = platform_get_drvdata(pdev);
396 for (i = 0; i < priv->num_leds; i++)
397 delete_ns2_led(&priv->leds_data[i]);
402 static struct platform_driver ns2_led_driver = {
403 .probe = ns2_led_probe,
404 .remove = ns2_led_remove,
407 .of_match_table = of_match_ptr(of_ns2_leds_match),
411 module_platform_driver(ns2_led_driver);
414 MODULE_DESCRIPTION("Network Space v2 LED driver");
415 MODULE_LICENSE("GPL");
416 MODULE_ALIAS("platform:leds-ns2");