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Linux/drivers/leds/leds-netxbig.c

  1 /*
  2  * leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs
  3  *
  4  * Copyright (C) 2010 LaCie
  5  *
  6  * Author: Simon Guinot <sguinot@lacie.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 21  */
 22 
 23 #include <linux/module.h>
 24 #include <linux/init.h>
 25 #include <linux/irq.h>
 26 #include <linux/slab.h>
 27 #include <linux/spinlock.h>
 28 #include <linux/platform_device.h>
 29 #include <linux/gpio.h>
 30 #include <linux/leds.h>
 31 #include <linux/platform_data/leds-kirkwood-netxbig.h>
 32 
 33 /*
 34  * GPIO extension bus.
 35  */
 36 
 37 static DEFINE_SPINLOCK(gpio_ext_lock);
 38 
 39 static void gpio_ext_set_addr(struct netxbig_gpio_ext *gpio_ext, int addr)
 40 {
 41         int pin;
 42 
 43         for (pin = 0; pin < gpio_ext->num_addr; pin++)
 44                 gpio_set_value(gpio_ext->addr[pin], (addr >> pin) & 1);
 45 }
 46 
 47 static void gpio_ext_set_data(struct netxbig_gpio_ext *gpio_ext, int data)
 48 {
 49         int pin;
 50 
 51         for (pin = 0; pin < gpio_ext->num_data; pin++)
 52                 gpio_set_value(gpio_ext->data[pin], (data >> pin) & 1);
 53 }
 54 
 55 static void gpio_ext_enable_select(struct netxbig_gpio_ext *gpio_ext)
 56 {
 57         /* Enable select is done on the raising edge. */
 58         gpio_set_value(gpio_ext->enable, 0);
 59         gpio_set_value(gpio_ext->enable, 1);
 60 }
 61 
 62 static void gpio_ext_set_value(struct netxbig_gpio_ext *gpio_ext,
 63                                int addr, int value)
 64 {
 65         unsigned long flags;
 66 
 67         spin_lock_irqsave(&gpio_ext_lock, flags);
 68         gpio_ext_set_addr(gpio_ext, addr);
 69         gpio_ext_set_data(gpio_ext, value);
 70         gpio_ext_enable_select(gpio_ext);
 71         spin_unlock_irqrestore(&gpio_ext_lock, flags);
 72 }
 73 
 74 static int gpio_ext_init(struct netxbig_gpio_ext *gpio_ext)
 75 {
 76         int err;
 77         int i;
 78 
 79         if (unlikely(!gpio_ext))
 80                 return -EINVAL;
 81 
 82         /* Configure address GPIOs. */
 83         for (i = 0; i < gpio_ext->num_addr; i++) {
 84                 err = gpio_request_one(gpio_ext->addr[i], GPIOF_OUT_INIT_LOW,
 85                                        "GPIO extension addr");
 86                 if (err)
 87                         goto err_free_addr;
 88         }
 89         /* Configure data GPIOs. */
 90         for (i = 0; i < gpio_ext->num_data; i++) {
 91                 err = gpio_request_one(gpio_ext->data[i], GPIOF_OUT_INIT_LOW,
 92                                    "GPIO extension data");
 93                 if (err)
 94                         goto err_free_data;
 95         }
 96         /* Configure "enable select" GPIO. */
 97         err = gpio_request_one(gpio_ext->enable, GPIOF_OUT_INIT_LOW,
 98                                "GPIO extension enable");
 99         if (err)
100                 goto err_free_data;
101 
102         return 0;
103 
104 err_free_data:
105         for (i = i - 1; i >= 0; i--)
106                 gpio_free(gpio_ext->data[i]);
107         i = gpio_ext->num_addr;
108 err_free_addr:
109         for (i = i - 1; i >= 0; i--)
110                 gpio_free(gpio_ext->addr[i]);
111 
112         return err;
113 }
114 
115 static void gpio_ext_free(struct netxbig_gpio_ext *gpio_ext)
116 {
117         int i;
118 
119         gpio_free(gpio_ext->enable);
120         for (i = gpio_ext->num_addr - 1; i >= 0; i--)
121                 gpio_free(gpio_ext->addr[i]);
122         for (i = gpio_ext->num_data - 1; i >= 0; i--)
123                 gpio_free(gpio_ext->data[i]);
124 }
125 
126 /*
127  * Class LED driver.
128  */
129 
130 struct netxbig_led_data {
131         struct netxbig_gpio_ext *gpio_ext;
132         struct led_classdev     cdev;
133         int                     mode_addr;
134         int                     *mode_val;
135         int                     bright_addr;
136         int                     bright_max;
137         struct                  netxbig_led_timer *timer;
138         int                     num_timer;
139         enum netxbig_led_mode   mode;
140         int                     sata;
141         spinlock_t              lock;
142 };
143 
144 static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode,
145                                       unsigned long delay_on,
146                                       unsigned long delay_off,
147                                       struct netxbig_led_timer *timer,
148                                       int num_timer)
149 {
150         int i;
151 
152         for (i = 0; i < num_timer; i++) {
153                 if (timer[i].delay_on == delay_on &&
154                     timer[i].delay_off == delay_off) {
155                         *mode = timer[i].mode;
156                         return 0;
157                 }
158         }
159         return -EINVAL;
160 }
161 
162 static int netxbig_led_blink_set(struct led_classdev *led_cdev,
163                                  unsigned long *delay_on,
164                                  unsigned long *delay_off)
165 {
166         struct netxbig_led_data *led_dat =
167                 container_of(led_cdev, struct netxbig_led_data, cdev);
168         enum netxbig_led_mode mode;
169         int mode_val;
170         int ret;
171 
172         /* Look for a LED mode with the requested timer frequency. */
173         ret = netxbig_led_get_timer_mode(&mode, *delay_on, *delay_off,
174                                          led_dat->timer, led_dat->num_timer);
175         if (ret < 0)
176                 return ret;
177 
178         mode_val = led_dat->mode_val[mode];
179         if (mode_val == NETXBIG_LED_INVALID_MODE)
180                 return -EINVAL;
181 
182         spin_lock_irq(&led_dat->lock);
183 
184         gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
185         led_dat->mode = mode;
186 
187         spin_unlock_irq(&led_dat->lock);
188 
189         return 0;
190 }
191 
192 static void netxbig_led_set(struct led_classdev *led_cdev,
193                             enum led_brightness value)
194 {
195         struct netxbig_led_data *led_dat =
196                 container_of(led_cdev, struct netxbig_led_data, cdev);
197         enum netxbig_led_mode mode;
198         int mode_val, bright_val;
199         int set_brightness = 1;
200         unsigned long flags;
201 
202         spin_lock_irqsave(&led_dat->lock, flags);
203 
204         if (value == LED_OFF) {
205                 mode = NETXBIG_LED_OFF;
206                 set_brightness = 0;
207         } else {
208                 if (led_dat->sata)
209                         mode = NETXBIG_LED_SATA;
210                 else if (led_dat->mode == NETXBIG_LED_OFF)
211                         mode = NETXBIG_LED_ON;
212                 else /* Keep 'timer' mode. */
213                         mode = led_dat->mode;
214         }
215         mode_val = led_dat->mode_val[mode];
216 
217         gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
218         led_dat->mode = mode;
219         /*
220          * Note that the brightness register is shared between all the
221          * SATA LEDs. So, change the brightness setting for a single
222          * SATA LED will affect all the others.
223          */
224         if (set_brightness) {
225                 bright_val = DIV_ROUND_UP(value * led_dat->bright_max,
226                                           LED_FULL);
227                 gpio_ext_set_value(led_dat->gpio_ext,
228                                    led_dat->bright_addr, bright_val);
229         }
230 
231         spin_unlock_irqrestore(&led_dat->lock, flags);
232 }
233 
234 static ssize_t netxbig_led_sata_store(struct device *dev,
235                                       struct device_attribute *attr,
236                                       const char *buff, size_t count)
237 {
238         struct led_classdev *led_cdev = dev_get_drvdata(dev);
239         struct netxbig_led_data *led_dat =
240                 container_of(led_cdev, struct netxbig_led_data, cdev);
241         unsigned long enable;
242         enum netxbig_led_mode mode;
243         int mode_val;
244         int ret;
245 
246         ret = kstrtoul(buff, 10, &enable);
247         if (ret < 0)
248                 return ret;
249 
250         enable = !!enable;
251 
252         spin_lock_irq(&led_dat->lock);
253 
254         if (led_dat->sata == enable) {
255                 ret = count;
256                 goto exit_unlock;
257         }
258 
259         if (led_dat->mode != NETXBIG_LED_ON &&
260             led_dat->mode != NETXBIG_LED_SATA)
261                 mode = led_dat->mode; /* Keep modes 'off' and 'timer'. */
262         else if (enable)
263                 mode = NETXBIG_LED_SATA;
264         else
265                 mode = NETXBIG_LED_ON;
266 
267         mode_val = led_dat->mode_val[mode];
268         if (mode_val == NETXBIG_LED_INVALID_MODE) {
269                 ret = -EINVAL;
270                 goto exit_unlock;
271         }
272 
273         gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
274         led_dat->mode = mode;
275         led_dat->sata = enable;
276 
277         ret = count;
278 
279 exit_unlock:
280         spin_unlock_irq(&led_dat->lock);
281 
282         return ret;
283 }
284 
285 static ssize_t netxbig_led_sata_show(struct device *dev,
286                                      struct device_attribute *attr, char *buf)
287 {
288         struct led_classdev *led_cdev = dev_get_drvdata(dev);
289         struct netxbig_led_data *led_dat =
290                 container_of(led_cdev, struct netxbig_led_data, cdev);
291 
292         return sprintf(buf, "%d\n", led_dat->sata);
293 }
294 
295 static DEVICE_ATTR(sata, 0644, netxbig_led_sata_show, netxbig_led_sata_store);
296 
297 static void delete_netxbig_led(struct netxbig_led_data *led_dat)
298 {
299         if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
300                 device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
301         led_classdev_unregister(&led_dat->cdev);
302 }
303 
304 static int
305 create_netxbig_led(struct platform_device *pdev,
306                    struct netxbig_led_data *led_dat,
307                    const struct netxbig_led *template)
308 {
309         struct netxbig_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
310         int ret;
311 
312         spin_lock_init(&led_dat->lock);
313         led_dat->gpio_ext = pdata->gpio_ext;
314         led_dat->cdev.name = template->name;
315         led_dat->cdev.default_trigger = template->default_trigger;
316         led_dat->cdev.blink_set = netxbig_led_blink_set;
317         led_dat->cdev.brightness_set = netxbig_led_set;
318         /*
319          * Because the GPIO extension bus don't allow to read registers
320          * value, there is no way to probe the LED initial state.
321          * So, the initial sysfs LED value for the "brightness" and "sata"
322          * attributes are inconsistent.
323          *
324          * Note that the initial LED state can't be reconfigured.
325          * The reason is that the LED behaviour must stay uniform during
326          * the whole boot process (bootloader+linux).
327          */
328         led_dat->sata = 0;
329         led_dat->cdev.brightness = LED_OFF;
330         led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
331         led_dat->mode_addr = template->mode_addr;
332         led_dat->mode_val = template->mode_val;
333         led_dat->bright_addr = template->bright_addr;
334         led_dat->bright_max = (1 << pdata->gpio_ext->num_data) - 1;
335         led_dat->timer = pdata->timer;
336         led_dat->num_timer = pdata->num_timer;
337 
338         ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
339         if (ret < 0)
340                 return ret;
341 
342         /*
343          * If available, expose the SATA activity blink capability through
344          * a "sata" sysfs attribute.
345          */
346         if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE) {
347                 ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
348                 if (ret)
349                         led_classdev_unregister(&led_dat->cdev);
350         }
351 
352         return ret;
353 }
354 
355 static int netxbig_led_probe(struct platform_device *pdev)
356 {
357         struct netxbig_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
358         struct netxbig_led_data *leds_data;
359         int i;
360         int ret;
361 
362         if (!pdata)
363                 return -EINVAL;
364 
365         leds_data = devm_kzalloc(&pdev->dev,
366                 sizeof(struct netxbig_led_data) * pdata->num_leds, GFP_KERNEL);
367         if (!leds_data)
368                 return -ENOMEM;
369 
370         ret = gpio_ext_init(pdata->gpio_ext);
371         if (ret < 0)
372                 return ret;
373 
374         for (i = 0; i < pdata->num_leds; i++) {
375                 ret = create_netxbig_led(pdev, &leds_data[i], &pdata->leds[i]);
376                 if (ret < 0)
377                         goto err_free_leds;
378         }
379 
380         platform_set_drvdata(pdev, leds_data);
381 
382         return 0;
383 
384 err_free_leds:
385         for (i = i - 1; i >= 0; i--)
386                 delete_netxbig_led(&leds_data[i]);
387 
388         gpio_ext_free(pdata->gpio_ext);
389         return ret;
390 }
391 
392 static int netxbig_led_remove(struct platform_device *pdev)
393 {
394         struct netxbig_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
395         struct netxbig_led_data *leds_data;
396         int i;
397 
398         leds_data = platform_get_drvdata(pdev);
399 
400         for (i = 0; i < pdata->num_leds; i++)
401                 delete_netxbig_led(&leds_data[i]);
402 
403         gpio_ext_free(pdata->gpio_ext);
404 
405         return 0;
406 }
407 
408 static struct platform_driver netxbig_led_driver = {
409         .probe          = netxbig_led_probe,
410         .remove         = netxbig_led_remove,
411         .driver         = {
412                 .name   = "leds-netxbig",
413                 .owner  = THIS_MODULE,
414         },
415 };
416 
417 module_platform_driver(netxbig_led_driver);
418 
419 MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
420 MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards");
421 MODULE_LICENSE("GPL");
422 MODULE_ALIAS("platform:leds-netxbig");
423 

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