Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5

Linux/drivers/leds/leds-ns2.c

  1 /*
  2  * leds-ns2.c - Driver for the Network Space v2 (and parents) dual-GPIO LED
  3  *
  4  * Copyright (C) 2010 LaCie
  5  *
  6  * Author: Simon Guinot <sguinot@lacie.com>
  7  *
  8  * Based on leds-gpio.c by Raphael Assenat <raph@8d.com>
  9  *
 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.
 14  *
 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.
 19  *
 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
 23  */
 24 
 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>
 32 #include <linux/of.h>
 33 #include <linux/of_gpio.h>
 34 #include "leds.h"
 35 
 36 /*
 37  * The Network Space v2 dual-GPIO LED is wired to a CPLD. Three different LED
 38  * modes are available: off, on and SATA activity blinking. The LED modes are
 39  * controlled through two GPIOs (command and slow): each combination of values
 40  * for the command/slow GPIOs corresponds to a LED mode.
 41  */
 42 
 43 struct ns2_led_data {
 44         struct led_classdev     cdev;
 45         unsigned                cmd;
 46         unsigned                slow;
 47         bool                    can_sleep;
 48         unsigned char           sata; /* True when SATA mode active. */
 49         rwlock_t                rw_lock; /* Lock GPIOs. */
 50         int                     num_modes;
 51         struct ns2_led_modval   *modval;
 52 };
 53 
 54 static int ns2_led_get_mode(struct ns2_led_data *led_dat,
 55                             enum ns2_led_modes *mode)
 56 {
 57         int i;
 58         int ret = -EINVAL;
 59         int cmd_level;
 60         int slow_level;
 61 
 62         cmd_level = gpio_get_value_cansleep(led_dat->cmd);
 63         slow_level = gpio_get_value_cansleep(led_dat->slow);
 64 
 65         for (i = 0; i < led_dat->num_modes; i++) {
 66                 if (cmd_level == led_dat->modval[i].cmd_level &&
 67                     slow_level == led_dat->modval[i].slow_level) {
 68                         *mode = led_dat->modval[i].mode;
 69                         ret = 0;
 70                         break;
 71                 }
 72         }
 73 
 74         return ret;
 75 }
 76 
 77 static void ns2_led_set_mode(struct ns2_led_data *led_dat,
 78                              enum ns2_led_modes mode)
 79 {
 80         int i;
 81         bool found = false;
 82         unsigned long flags;
 83 
 84         for (i = 0; i < led_dat->num_modes; i++)
 85                 if (mode == led_dat->modval[i].mode) {
 86                         found = true;
 87                         break;
 88                 }
 89 
 90         if (!found)
 91                 return;
 92 
 93         write_lock_irqsave(&led_dat->rw_lock, flags);
 94 
 95         if (!led_dat->can_sleep) {
 96                 gpio_set_value(led_dat->cmd,
 97                                led_dat->modval[i].cmd_level);
 98                 gpio_set_value(led_dat->slow,
 99                                led_dat->modval[i].slow_level);
100                 goto exit_unlock;
101         }
102 
103         gpio_set_value_cansleep(led_dat->cmd, led_dat->modval[i].cmd_level);
104         gpio_set_value_cansleep(led_dat->slow, led_dat->modval[i].slow_level);
105 
106 exit_unlock:
107         write_unlock_irqrestore(&led_dat->rw_lock, flags);
108 }
109 
110 static void ns2_led_set(struct led_classdev *led_cdev,
111                         enum led_brightness value)
112 {
113         struct ns2_led_data *led_dat =
114                 container_of(led_cdev, struct ns2_led_data, cdev);
115         enum ns2_led_modes mode;
116 
117         if (value == LED_OFF)
118                 mode = NS_V2_LED_OFF;
119         else if (led_dat->sata)
120                 mode = NS_V2_LED_SATA;
121         else
122                 mode = NS_V2_LED_ON;
123 
124         ns2_led_set_mode(led_dat, mode);
125 }
126 
127 static int ns2_led_set_blocking(struct led_classdev *led_cdev,
128                         enum led_brightness value)
129 {
130         ns2_led_set(led_cdev, value);
131         return 0;
132 }
133 
134 static ssize_t ns2_led_sata_store(struct device *dev,
135                                   struct device_attribute *attr,
136                                   const char *buff, size_t count)
137 {
138         struct led_classdev *led_cdev = dev_get_drvdata(dev);
139         struct ns2_led_data *led_dat =
140                 container_of(led_cdev, struct ns2_led_data, cdev);
141         int ret;
142         unsigned long enable;
143 
144         ret = kstrtoul(buff, 10, &enable);
145         if (ret < 0)
146                 return ret;
147 
148         enable = !!enable;
149 
150         if (led_dat->sata == enable)
151                 goto exit;
152 
153         led_dat->sata = enable;
154 
155         if (!led_get_brightness(led_cdev))
156                 goto exit;
157 
158         if (enable)
159                 ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
160         else
161                 ns2_led_set_mode(led_dat, NS_V2_LED_ON);
162 
163 exit:
164         return count;
165 }
166 
167 static ssize_t ns2_led_sata_show(struct device *dev,
168                                  struct device_attribute *attr, char *buf)
169 {
170         struct led_classdev *led_cdev = dev_get_drvdata(dev);
171         struct ns2_led_data *led_dat =
172                 container_of(led_cdev, struct ns2_led_data, cdev);
173 
174         return sprintf(buf, "%d\n", led_dat->sata);
175 }
176 
177 static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
178 
179 static struct attribute *ns2_led_attrs[] = {
180         &dev_attr_sata.attr,
181         NULL
182 };
183 ATTRIBUTE_GROUPS(ns2_led);
184 
185 static int
186 create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
187                const struct ns2_led *template)
188 {
189         int ret;
190         enum ns2_led_modes mode;
191 
192         ret = devm_gpio_request_one(&pdev->dev, template->cmd,
193                         gpio_get_value_cansleep(template->cmd) ?
194                         GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
195                         template->name);
196         if (ret) {
197                 dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
198                         template->name);
199                 return ret;
200         }
201 
202         ret = devm_gpio_request_one(&pdev->dev, template->slow,
203                         gpio_get_value_cansleep(template->slow) ?
204                         GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
205                         template->name);
206         if (ret) {
207                 dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
208                         template->name);
209                 return ret;
210         }
211 
212         rwlock_init(&led_dat->rw_lock);
213 
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.flags |= LED_CORE_SUSPENDRESUME;
218         led_dat->cdev.groups = ns2_led_groups;
219         led_dat->cmd = template->cmd;
220         led_dat->slow = template->slow;
221         led_dat->can_sleep = gpio_cansleep(led_dat->cmd) |
222                                 gpio_cansleep(led_dat->slow);
223         if (led_dat->can_sleep)
224                 led_dat->cdev.brightness_set_blocking = ns2_led_set_blocking;
225         else
226                 led_dat->cdev.brightness_set = ns2_led_set;
227         led_dat->modval = template->modval;
228         led_dat->num_modes = template->num_modes;
229 
230         ret = ns2_led_get_mode(led_dat, &mode);
231         if (ret < 0)
232                 return ret;
233 
234         /* Set LED initial state. */
235         led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
236         led_dat->cdev.brightness =
237                 (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
238 
239         ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
240         if (ret < 0)
241                 return ret;
242 
243         return 0;
244 }
245 
246 static void delete_ns2_led(struct ns2_led_data *led_dat)
247 {
248         led_classdev_unregister(&led_dat->cdev);
249 }
250 
251 #ifdef CONFIG_OF_GPIO
252 /*
253  * Translate OpenFirmware node properties into platform_data.
254  */
255 static int
256 ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata)
257 {
258         struct device_node *np = dev->of_node;
259         struct device_node *child;
260         struct ns2_led *led, *leds;
261         int num_leds = 0;
262 
263         num_leds = of_get_child_count(np);
264         if (!num_leds)
265                 return -ENODEV;
266 
267         leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led),
268                             GFP_KERNEL);
269         if (!leds)
270                 return -ENOMEM;
271 
272         led = leds;
273         for_each_child_of_node(np, child) {
274                 const char *string;
275                 int ret, i, num_modes;
276                 struct ns2_led_modval *modval;
277 
278                 ret = of_get_named_gpio(child, "cmd-gpio", 0);
279                 if (ret < 0)
280                         return ret;
281                 led->cmd = ret;
282                 ret = of_get_named_gpio(child, "slow-gpio", 0);
283                 if (ret < 0)
284                         return ret;
285                 led->slow = ret;
286                 ret = of_property_read_string(child, "label", &string);
287                 led->name = (ret == 0) ? string : child->name;
288                 ret = of_property_read_string(child, "linux,default-trigger",
289                                               &string);
290                 if (ret == 0)
291                         led->default_trigger = string;
292 
293                 ret = of_property_count_u32_elems(child, "modes-map");
294                 if (ret < 0 || ret % 3) {
295                         dev_err(dev,
296                                 "Missing or malformed modes-map property\n");
297                         return -EINVAL;
298                 }
299 
300                 num_modes = ret / 3;
301                 modval = devm_kzalloc(dev,
302                                       num_modes * sizeof(struct ns2_led_modval),
303                                       GFP_KERNEL);
304                 if (!modval)
305                         return -ENOMEM;
306 
307                 for (i = 0; i < num_modes; i++) {
308                         of_property_read_u32_index(child,
309                                                 "modes-map", 3 * i,
310                                                 (u32 *) &modval[i].mode);
311                         of_property_read_u32_index(child,
312                                                 "modes-map", 3 * i + 1,
313                                                 (u32 *) &modval[i].cmd_level);
314                         of_property_read_u32_index(child,
315                                                 "modes-map", 3 * i + 2,
316                                                 (u32 *) &modval[i].slow_level);
317                 }
318 
319                 led->num_modes = num_modes;
320                 led->modval = modval;
321 
322                 led++;
323         }
324 
325         pdata->leds = leds;
326         pdata->num_leds = num_leds;
327 
328         return 0;
329 }
330 
331 static const struct of_device_id of_ns2_leds_match[] = {
332         { .compatible = "lacie,ns2-leds", },
333         {},
334 };
335 MODULE_DEVICE_TABLE(of, of_ns2_leds_match);
336 #endif /* CONFIG_OF_GPIO */
337 
338 struct ns2_led_priv {
339         int num_leds;
340         struct ns2_led_data leds_data[];
341 };
342 
343 static inline int sizeof_ns2_led_priv(int num_leds)
344 {
345         return sizeof(struct ns2_led_priv) +
346                       (sizeof(struct ns2_led_data) * num_leds);
347 }
348 
349 static int ns2_led_probe(struct platform_device *pdev)
350 {
351         struct ns2_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
352         struct ns2_led_priv *priv;
353         int i;
354         int ret;
355 
356 #ifdef CONFIG_OF_GPIO
357         if (!pdata) {
358                 pdata = devm_kzalloc(&pdev->dev,
359                                      sizeof(struct ns2_led_platform_data),
360                                      GFP_KERNEL);
361                 if (!pdata)
362                         return -ENOMEM;
363 
364                 ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
365                 if (ret)
366                         return ret;
367         }
368 #else
369         if (!pdata)
370                 return -EINVAL;
371 #endif /* CONFIG_OF_GPIO */
372 
373         priv = devm_kzalloc(&pdev->dev,
374                             sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
375         if (!priv)
376                 return -ENOMEM;
377         priv->num_leds = pdata->num_leds;
378 
379         for (i = 0; i < priv->num_leds; i++) {
380                 ret = create_ns2_led(pdev, &priv->leds_data[i],
381                                      &pdata->leds[i]);
382                 if (ret < 0) {
383                         for (i = i - 1; i >= 0; i--)
384                                 delete_ns2_led(&priv->leds_data[i]);
385                         return ret;
386                 }
387         }
388 
389         platform_set_drvdata(pdev, priv);
390 
391         return 0;
392 }
393 
394 static int ns2_led_remove(struct platform_device *pdev)
395 {
396         int i;
397         struct ns2_led_priv *priv;
398 
399         priv = platform_get_drvdata(pdev);
400 
401         for (i = 0; i < priv->num_leds; i++)
402                 delete_ns2_led(&priv->leds_data[i]);
403 
404         return 0;
405 }
406 
407 static struct platform_driver ns2_led_driver = {
408         .probe          = ns2_led_probe,
409         .remove         = ns2_led_remove,
410         .driver         = {
411                 .name           = "leds-ns2",
412                 .of_match_table = of_match_ptr(of_ns2_leds_match),
413         },
414 };
415 
416 module_platform_driver(ns2_led_driver);
417 
418 MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
419 MODULE_DESCRIPTION("Network Space v2 LED driver");
420 MODULE_LICENSE("GPL");
421 MODULE_ALIAS("platform:leds-ns2");
422 

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