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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         int                     mode_index;
 49         unsigned char           sata; /* True when SATA mode active. */
 50         rwlock_t                rw_lock; /* Lock GPIOs. */
 51         struct work_struct      work;
 52         int                     num_modes;
 53         struct ns2_led_modval   *modval;
 54 };
 55 
 56 static void ns2_led_work(struct work_struct *work)
 57 {
 58         struct ns2_led_data *led_dat =
 59                 container_of(work, struct ns2_led_data, work);
 60         int i = led_dat->mode_index;
 61 
 62         gpio_set_value_cansleep(led_dat->cmd, led_dat->modval[i].cmd_level);
 63         gpio_set_value_cansleep(led_dat->slow, led_dat->modval[i].slow_level);
 64 }
 65 
 66 static int ns2_led_get_mode(struct ns2_led_data *led_dat,
 67                             enum ns2_led_modes *mode)
 68 {
 69         int i;
 70         int ret = -EINVAL;
 71         int cmd_level;
 72         int slow_level;
 73 
 74         cmd_level = gpio_get_value_cansleep(led_dat->cmd);
 75         slow_level = gpio_get_value_cansleep(led_dat->slow);
 76 
 77         for (i = 0; i < led_dat->num_modes; i++) {
 78                 if (cmd_level == led_dat->modval[i].cmd_level &&
 79                     slow_level == led_dat->modval[i].slow_level) {
 80                         *mode = led_dat->modval[i].mode;
 81                         ret = 0;
 82                         break;
 83                 }
 84         }
 85 
 86         return ret;
 87 }
 88 
 89 static void ns2_led_set_mode(struct ns2_led_data *led_dat,
 90                              enum ns2_led_modes mode)
 91 {
 92         int i;
 93         bool found = false;
 94         unsigned long flags;
 95 
 96         for (i = 0; i < led_dat->num_modes; i++)
 97                 if (mode == led_dat->modval[i].mode) {
 98                         found = true;
 99                         break;
100                 }
101 
102         if (!found)
103                 return;
104 
105         write_lock_irqsave(&led_dat->rw_lock, flags);
106 
107         if (!led_dat->can_sleep) {
108                 gpio_set_value(led_dat->cmd,
109                                led_dat->modval[i].cmd_level);
110                 gpio_set_value(led_dat->slow,
111                                led_dat->modval[i].slow_level);
112                 goto exit_unlock;
113         }
114 
115         led_dat->mode_index = i;
116         schedule_work(&led_dat->work);
117 
118 exit_unlock:
119         write_unlock_irqrestore(&led_dat->rw_lock, flags);
120 }
121 
122 static void ns2_led_set(struct led_classdev *led_cdev,
123                         enum led_brightness value)
124 {
125         struct ns2_led_data *led_dat =
126                 container_of(led_cdev, struct ns2_led_data, cdev);
127         enum ns2_led_modes mode;
128 
129         if (value == LED_OFF)
130                 mode = NS_V2_LED_OFF;
131         else if (led_dat->sata)
132                 mode = NS_V2_LED_SATA;
133         else
134                 mode = NS_V2_LED_ON;
135 
136         ns2_led_set_mode(led_dat, mode);
137 }
138 
139 static ssize_t ns2_led_sata_store(struct device *dev,
140                                   struct device_attribute *attr,
141                                   const char *buff, size_t count)
142 {
143         struct led_classdev *led_cdev = dev_get_drvdata(dev);
144         struct ns2_led_data *led_dat =
145                 container_of(led_cdev, struct ns2_led_data, cdev);
146         int ret;
147         unsigned long enable;
148 
149         ret = kstrtoul(buff, 10, &enable);
150         if (ret < 0)
151                 return ret;
152 
153         enable = !!enable;
154 
155         if (led_dat->sata == enable)
156                 goto exit;
157 
158         led_dat->sata = enable;
159 
160         if (!led_get_brightness(led_cdev))
161                 goto exit;
162 
163         if (enable)
164                 ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
165         else
166                 ns2_led_set_mode(led_dat, NS_V2_LED_ON);
167 
168 exit:
169         return count;
170 }
171 
172 static ssize_t ns2_led_sata_show(struct device *dev,
173                                  struct device_attribute *attr, char *buf)
174 {
175         struct led_classdev *led_cdev = dev_get_drvdata(dev);
176         struct ns2_led_data *led_dat =
177                 container_of(led_cdev, struct ns2_led_data, cdev);
178 
179         return sprintf(buf, "%d\n", led_dat->sata);
180 }
181 
182 static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
183 
184 static struct attribute *ns2_led_attrs[] = {
185         &dev_attr_sata.attr,
186         NULL
187 };
188 ATTRIBUTE_GROUPS(ns2_led);
189 
190 static int
191 create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
192                const struct ns2_led *template)
193 {
194         int ret;
195         enum ns2_led_modes mode;
196 
197         ret = devm_gpio_request_one(&pdev->dev, template->cmd,
198                         gpio_get_value_cansleep(template->cmd) ?
199                         GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
200                         template->name);
201         if (ret) {
202                 dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
203                         template->name);
204                 return ret;
205         }
206 
207         ret = devm_gpio_request_one(&pdev->dev, template->slow,
208                         gpio_get_value_cansleep(template->slow) ?
209                         GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
210                         template->name);
211         if (ret) {
212                 dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
213                         template->name);
214                 return ret;
215         }
216 
217         rwlock_init(&led_dat->rw_lock);
218 
219         led_dat->cdev.name = template->name;
220         led_dat->cdev.default_trigger = template->default_trigger;
221         led_dat->cdev.blink_set = NULL;
222         led_dat->cdev.brightness_set = ns2_led_set;
223         led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
224         led_dat->cdev.groups = ns2_led_groups;
225         led_dat->cmd = template->cmd;
226         led_dat->slow = template->slow;
227         led_dat->can_sleep = gpio_cansleep(led_dat->cmd) |
228                                 gpio_cansleep(led_dat->slow);
229         led_dat->modval = template->modval;
230         led_dat->num_modes = template->num_modes;
231 
232         ret = ns2_led_get_mode(led_dat, &mode);
233         if (ret < 0)
234                 return ret;
235 
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;
240 
241         INIT_WORK(&led_dat->work, ns2_led_work);
242 
243         ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
244         if (ret < 0)
245                 return ret;
246 
247         return 0;
248 }
249 
250 static void delete_ns2_led(struct ns2_led_data *led_dat)
251 {
252         led_classdev_unregister(&led_dat->cdev);
253         cancel_work_sync(&led_dat->work);
254 }
255 
256 #ifdef CONFIG_OF_GPIO
257 /*
258  * Translate OpenFirmware node properties into platform_data.
259  */
260 static int
261 ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata)
262 {
263         struct device_node *np = dev->of_node;
264         struct device_node *child;
265         struct ns2_led *led, *leds;
266         int num_leds = 0;
267 
268         num_leds = of_get_child_count(np);
269         if (!num_leds)
270                 return -ENODEV;
271 
272         leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led),
273                             GFP_KERNEL);
274         if (!leds)
275                 return -ENOMEM;
276 
277         led = leds;
278         for_each_child_of_node(np, child) {
279                 const char *string;
280                 int ret, i, num_modes;
281                 struct ns2_led_modval *modval;
282 
283                 ret = of_get_named_gpio(child, "cmd-gpio", 0);
284                 if (ret < 0)
285                         return ret;
286                 led->cmd = ret;
287                 ret = of_get_named_gpio(child, "slow-gpio", 0);
288                 if (ret < 0)
289                         return ret;
290                 led->slow = ret;
291                 ret = of_property_read_string(child, "label", &string);
292                 led->name = (ret == 0) ? string : child->name;
293                 ret = of_property_read_string(child, "linux,default-trigger",
294                                               &string);
295                 if (ret == 0)
296                         led->default_trigger = string;
297 
298                 ret = of_property_count_u32_elems(child, "modes-map");
299                 if (ret < 0 || ret % 3) {
300                         dev_err(dev,
301                                 "Missing or malformed modes-map property\n");
302                         return -EINVAL;
303                 }
304 
305                 num_modes = ret / 3;
306                 modval = devm_kzalloc(dev,
307                                       num_modes * sizeof(struct ns2_led_modval),
308                                       GFP_KERNEL);
309                 if (!modval)
310                         return -ENOMEM;
311 
312                 for (i = 0; i < num_modes; i++) {
313                         of_property_read_u32_index(child,
314                                                 "modes-map", 3 * i,
315                                                 (u32 *) &modval[i].mode);
316                         of_property_read_u32_index(child,
317                                                 "modes-map", 3 * i + 1,
318                                                 (u32 *) &modval[i].cmd_level);
319                         of_property_read_u32_index(child,
320                                                 "modes-map", 3 * i + 2,
321                                                 (u32 *) &modval[i].slow_level);
322                 }
323 
324                 led->num_modes = num_modes;
325                 led->modval = modval;
326 
327                 led++;
328         }
329 
330         pdata->leds = leds;
331         pdata->num_leds = num_leds;
332 
333         return 0;
334 }
335 
336 static const struct of_device_id of_ns2_leds_match[] = {
337         { .compatible = "lacie,ns2-leds", },
338         {},
339 };
340 MODULE_DEVICE_TABLE(of, of_ns2_leds_match);
341 #endif /* CONFIG_OF_GPIO */
342 
343 struct ns2_led_priv {
344         int num_leds;
345         struct ns2_led_data leds_data[];
346 };
347 
348 static inline int sizeof_ns2_led_priv(int num_leds)
349 {
350         return sizeof(struct ns2_led_priv) +
351                       (sizeof(struct ns2_led_data) * num_leds);
352 }
353 
354 static int ns2_led_probe(struct platform_device *pdev)
355 {
356         struct ns2_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
357         struct ns2_led_priv *priv;
358         int i;
359         int ret;
360 
361 #ifdef CONFIG_OF_GPIO
362         if (!pdata) {
363                 pdata = devm_kzalloc(&pdev->dev,
364                                      sizeof(struct ns2_led_platform_data),
365                                      GFP_KERNEL);
366                 if (!pdata)
367                         return -ENOMEM;
368 
369                 ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
370                 if (ret)
371                         return ret;
372         }
373 #else
374         if (!pdata)
375                 return -EINVAL;
376 #endif /* CONFIG_OF_GPIO */
377 
378         priv = devm_kzalloc(&pdev->dev,
379                             sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
380         if (!priv)
381                 return -ENOMEM;
382         priv->num_leds = pdata->num_leds;
383 
384         for (i = 0; i < priv->num_leds; i++) {
385                 ret = create_ns2_led(pdev, &priv->leds_data[i],
386                                      &pdata->leds[i]);
387                 if (ret < 0) {
388                         for (i = i - 1; i >= 0; i--)
389                                 delete_ns2_led(&priv->leds_data[i]);
390                         return ret;
391                 }
392         }
393 
394         platform_set_drvdata(pdev, priv);
395 
396         return 0;
397 }
398 
399 static int ns2_led_remove(struct platform_device *pdev)
400 {
401         int i;
402         struct ns2_led_priv *priv;
403 
404         priv = platform_get_drvdata(pdev);
405 
406         for (i = 0; i < priv->num_leds; i++)
407                 delete_ns2_led(&priv->leds_data[i]);
408 
409         return 0;
410 }
411 
412 static struct platform_driver ns2_led_driver = {
413         .probe          = ns2_led_probe,
414         .remove         = ns2_led_remove,
415         .driver         = {
416                 .name           = "leds-ns2",
417                 .of_match_table = of_match_ptr(of_ns2_leds_match),
418         },
419 };
420 
421 module_platform_driver(ns2_led_driver);
422 
423 MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
424 MODULE_DESCRIPTION("Network Space v2 LED driver");
425 MODULE_LICENSE("GPL");
426 MODULE_ALIAS("platform:leds-ns2");
427 

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