[SCSI] libsas: execute transport link resets with libata-eh via host workqueue
[linux-2.6.git] / drivers / leds / leds-pca9532.c
1 /*
2  * pca9532.c - 16-bit Led dimmer
3  *
4  * Copyright (C) 2011 Jan Weitzel
5  * Copyright (C) 2008 Riku Voipio
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; version 2 of the License.
10  *
11  * Datasheet: http://www.nxp.com/documents/data_sheet/PCA9532.pdf
12  *
13  */
14
15 #include <linux/module.h>
16 #include <linux/i2c.h>
17 #include <linux/slab.h>
18 #include <linux/leds.h>
19 #include <linux/input.h>
20 #include <linux/mutex.h>
21 #include <linux/workqueue.h>
22 #include <linux/leds-pca9532.h>
23 #include <linux/gpio.h>
24
25 /* m =  num_leds*/
26 #define PCA9532_REG_INPUT(i)    ((i) >> 3)
27 #define PCA9532_REG_OFFSET(m)   ((m) >> 4)
28 #define PCA9532_REG_PSC(m, i)   (PCA9532_REG_OFFSET(m) + 0x1 + (i) * 2)
29 #define PCA9532_REG_PWM(m, i)   (PCA9532_REG_OFFSET(m) + 0x2 + (i) * 2)
30 #define LED_REG(m, led)         (PCA9532_REG_OFFSET(m) + 0x5 + (led >> 2))
31 #define LED_NUM(led)            (led & 0x3)
32
33 #define ldev_to_led(c)       container_of(c, struct pca9532_led, ldev)
34
35 struct pca9532_chip_info {
36         u8      num_leds;
37 };
38
39 struct pca9532_data {
40         struct i2c_client *client;
41         struct pca9532_led leds[16];
42         struct mutex update_lock;
43         struct input_dev *idev;
44         struct work_struct work;
45 #ifdef CONFIG_LEDS_PCA9532_GPIO
46         struct gpio_chip gpio;
47 #endif
48         const struct pca9532_chip_info *chip_info;
49         u8 pwm[2];
50         u8 psc[2];
51 };
52
53 static int pca9532_probe(struct i2c_client *client,
54         const struct i2c_device_id *id);
55 static int pca9532_remove(struct i2c_client *client);
56
57 enum {
58         pca9530,
59         pca9531,
60         pca9532,
61         pca9533,
62 };
63
64 static const struct i2c_device_id pca9532_id[] = {
65         { "pca9530", pca9530 },
66         { "pca9531", pca9531 },
67         { "pca9532", pca9532 },
68         { "pca9533", pca9533 },
69         { }
70 };
71
72 MODULE_DEVICE_TABLE(i2c, pca9532_id);
73
74 static const struct pca9532_chip_info pca9532_chip_info_tbl[] = {
75         [pca9530] = {
76                 .num_leds = 2,
77         },
78         [pca9531] = {
79                 .num_leds = 8,
80         },
81         [pca9532] = {
82                 .num_leds = 16,
83         },
84         [pca9533] = {
85                 .num_leds = 4,
86         },
87 };
88
89 static struct i2c_driver pca9532_driver = {
90         .driver = {
91                 .name = "leds-pca953x",
92         },
93         .probe = pca9532_probe,
94         .remove = pca9532_remove,
95         .id_table = pca9532_id,
96 };
97
98 /* We have two pwm/blinkers, but 16 possible leds to drive. Additionally,
99  * the clever Thecus people are using one pwm to drive the beeper. So,
100  * as a compromise we average one pwm to the values requested by all
101  * leds that are not ON/OFF.
102  * */
103 static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink,
104         enum led_brightness value)
105 {
106         int a = 0, b = 0, i = 0;
107         struct pca9532_data *data = i2c_get_clientdata(client);
108         for (i = 0; i < data->chip_info->num_leds; i++) {
109                 if (data->leds[i].type == PCA9532_TYPE_LED &&
110                         data->leds[i].state == PCA9532_PWM0+pwm) {
111                                 a++;
112                                 b += data->leds[i].ldev.brightness;
113                 }
114         }
115         if (a == 0) {
116                 dev_err(&client->dev,
117                 "fear of division by zero %d/%d, wanted %d\n",
118                         b, a, value);
119                 return -EINVAL;
120         }
121         b = b/a;
122         if (b > 0xFF)
123                 return -EINVAL;
124         data->pwm[pwm] = b;
125         data->psc[pwm] = blink;
126         return 0;
127 }
128
129 static int pca9532_setpwm(struct i2c_client *client, int pwm)
130 {
131         struct pca9532_data *data = i2c_get_clientdata(client);
132         u8 maxleds = data->chip_info->num_leds;
133
134         mutex_lock(&data->update_lock);
135         i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, pwm),
136                 data->pwm[pwm]);
137         i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, pwm),
138                 data->psc[pwm]);
139         mutex_unlock(&data->update_lock);
140         return 0;
141 }
142
143 /* Set LED routing */
144 static void pca9532_setled(struct pca9532_led *led)
145 {
146         struct i2c_client *client = led->client;
147         struct pca9532_data *data = i2c_get_clientdata(client);
148         u8 maxleds = data->chip_info->num_leds;
149         char reg;
150
151         mutex_lock(&data->update_lock);
152         reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id));
153         /* zero led bits */
154         reg = reg & ~(0x3<<LED_NUM(led->id)*2);
155         /* set the new value */
156         reg = reg | (led->state << LED_NUM(led->id)*2);
157         i2c_smbus_write_byte_data(client, LED_REG(maxleds, led->id), reg);
158         mutex_unlock(&data->update_lock);
159 }
160
161 static void pca9532_set_brightness(struct led_classdev *led_cdev,
162         enum led_brightness value)
163 {
164         int err = 0;
165         struct pca9532_led *led = ldev_to_led(led_cdev);
166
167         if (value == LED_OFF)
168                 led->state = PCA9532_OFF;
169         else if (value == LED_FULL)
170                 led->state = PCA9532_ON;
171         else {
172                 led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */
173                 err = pca9532_calcpwm(led->client, 0, 0, value);
174                 if (err)
175                         return; /* XXX: led api doesn't allow error code? */
176         }
177         schedule_work(&led->work);
178 }
179
180 static int pca9532_set_blink(struct led_classdev *led_cdev,
181         unsigned long *delay_on, unsigned long *delay_off)
182 {
183         struct pca9532_led *led = ldev_to_led(led_cdev);
184         struct i2c_client *client = led->client;
185         int psc;
186         int err = 0;
187
188         if (*delay_on == 0 && *delay_off == 0) {
189         /* led subsystem ask us for a blink rate */
190                 *delay_on = 1000;
191                 *delay_off = 1000;
192         }
193         if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6)
194                 return -EINVAL;
195
196         /* Thecus specific: only use PSC/PWM 0 */
197         psc = (*delay_on * 152-1)/1000;
198         err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness);
199         if (err)
200                 return err;
201         schedule_work(&led->work);
202         return 0;
203 }
204
205 static int pca9532_event(struct input_dev *dev, unsigned int type,
206         unsigned int code, int value)
207 {
208         struct pca9532_data *data = input_get_drvdata(dev);
209
210         if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE)))
211                 return -1;
212
213         /* XXX: allow different kind of beeps with psc/pwm modifications */
214         if (value > 1 && value < 32767)
215                 data->pwm[1] = 127;
216         else
217                 data->pwm[1] = 0;
218
219         schedule_work(&data->work);
220
221         return 0;
222 }
223
224 static void pca9532_input_work(struct work_struct *work)
225 {
226         struct pca9532_data *data =
227                 container_of(work, struct pca9532_data, work);
228         u8 maxleds = data->chip_info->num_leds;
229
230         mutex_lock(&data->update_lock);
231         i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(maxleds, 1),
232                 data->pwm[1]);
233         mutex_unlock(&data->update_lock);
234 }
235
236 static void pca9532_led_work(struct work_struct *work)
237 {
238         struct pca9532_led *led;
239         led = container_of(work, struct pca9532_led, work);
240         if (led->state == PCA9532_PWM0)
241                 pca9532_setpwm(led->client, 0);
242         pca9532_setled(led);
243 }
244
245 #ifdef CONFIG_LEDS_PCA9532_GPIO
246 static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset)
247 {
248         struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio);
249         struct pca9532_led *led = &data->leds[offset];
250
251         if (led->type == PCA9532_TYPE_GPIO)
252                 return 0;
253
254         return -EBUSY;
255 }
256
257 static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val)
258 {
259         struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio);
260         struct pca9532_led *led = &data->leds[offset];
261
262         if (val)
263                 led->state = PCA9532_ON;
264         else
265                 led->state = PCA9532_OFF;
266
267         pca9532_setled(led);
268 }
269
270 static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset)
271 {
272         struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio);
273         unsigned char reg;
274
275         reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset));
276
277         return !!(reg & (1 << (offset % 8)));
278 }
279
280 static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
281 {
282         /* To use as input ensure pin is not driven */
283         pca9532_gpio_set_value(gc, offset, 0);
284
285         return 0;
286 }
287
288 static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val)
289 {
290         pca9532_gpio_set_value(gc, offset, val);
291
292         return 0;
293 }
294 #endif /* CONFIG_LEDS_PCA9532_GPIO */
295
296 static int pca9532_destroy_devices(struct pca9532_data *data, int n_devs)
297 {
298         int i = n_devs;
299
300         if (!data)
301                 return -EINVAL;
302
303         while (--i >= 0) {
304                 switch (data->leds[i].type) {
305                 case PCA9532_TYPE_NONE:
306                 case PCA9532_TYPE_GPIO:
307                         break;
308                 case PCA9532_TYPE_LED:
309                         led_classdev_unregister(&data->leds[i].ldev);
310                         cancel_work_sync(&data->leds[i].work);
311                         break;
312                 case PCA9532_TYPE_N2100_BEEP:
313                         if (data->idev != NULL) {
314                                 input_unregister_device(data->idev);
315                                 cancel_work_sync(&data->work);
316                                 data->idev = NULL;
317                         }
318                         break;
319                 }
320         }
321
322 #ifdef CONFIG_LEDS_PCA9532_GPIO
323         if (data->gpio.dev) {
324                 int err = gpiochip_remove(&data->gpio);
325                 if (err) {
326                         dev_err(&data->client->dev, "%s failed, %d\n",
327                                                 "gpiochip_remove()", err);
328                         return err;
329                 }
330         }
331 #endif
332
333         return 0;
334 }
335
336 static int pca9532_configure(struct i2c_client *client,
337         struct pca9532_data *data, struct pca9532_platform_data *pdata)
338 {
339         int i, err = 0;
340         int gpios = 0;
341         u8 maxleds = data->chip_info->num_leds;
342
343         for (i = 0; i < 2; i++) {
344                 data->pwm[i] = pdata->pwm[i];
345                 data->psc[i] = pdata->psc[i];
346                 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, i),
347                         data->pwm[i]);
348                 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i),
349                         data->psc[i]);
350         }
351
352         for (i = 0; i < data->chip_info->num_leds; i++) {
353                 struct pca9532_led *led = &data->leds[i];
354                 struct pca9532_led *pled = &pdata->leds[i];
355                 led->client = client;
356                 led->id = i;
357                 led->type = pled->type;
358                 switch (led->type) {
359                 case PCA9532_TYPE_NONE:
360                         break;
361                 case PCA9532_TYPE_GPIO:
362                         gpios++;
363                         break;
364                 case PCA9532_TYPE_LED:
365                         led->state = pled->state;
366                         led->name = pled->name;
367                         led->ldev.name = led->name;
368                         led->ldev.brightness = LED_OFF;
369                         led->ldev.brightness_set = pca9532_set_brightness;
370                         led->ldev.blink_set = pca9532_set_blink;
371                         INIT_WORK(&led->work, pca9532_led_work);
372                         err = led_classdev_register(&client->dev, &led->ldev);
373                         if (err < 0) {
374                                 dev_err(&client->dev,
375                                         "couldn't register LED %s\n",
376                                         led->name);
377                                 goto exit;
378                         }
379                         pca9532_setled(led);
380                         break;
381                 case PCA9532_TYPE_N2100_BEEP:
382                         BUG_ON(data->idev);
383                         led->state = PCA9532_PWM1;
384                         pca9532_setled(led);
385                         data->idev = input_allocate_device();
386                         if (data->idev == NULL) {
387                                 err = -ENOMEM;
388                                 goto exit;
389                         }
390                         data->idev->name = pled->name;
391                         data->idev->phys = "i2c/pca9532";
392                         data->idev->id.bustype = BUS_HOST;
393                         data->idev->id.vendor = 0x001f;
394                         data->idev->id.product = 0x0001;
395                         data->idev->id.version = 0x0100;
396                         data->idev->evbit[0] = BIT_MASK(EV_SND);
397                         data->idev->sndbit[0] = BIT_MASK(SND_BELL) |
398                                                 BIT_MASK(SND_TONE);
399                         data->idev->event = pca9532_event;
400                         input_set_drvdata(data->idev, data);
401                         INIT_WORK(&data->work, pca9532_input_work);
402                         err = input_register_device(data->idev);
403                         if (err) {
404                                 input_free_device(data->idev);
405                                 cancel_work_sync(&data->work);
406                                 data->idev = NULL;
407                                 goto exit;
408                         }
409                         break;
410                 }
411         }
412
413 #ifdef CONFIG_LEDS_PCA9532_GPIO
414         if (gpios) {
415                 data->gpio.label = "gpio-pca9532";
416                 data->gpio.direction_input = pca9532_gpio_direction_input;
417                 data->gpio.direction_output = pca9532_gpio_direction_output;
418                 data->gpio.set = pca9532_gpio_set_value;
419                 data->gpio.get = pca9532_gpio_get_value;
420                 data->gpio.request = pca9532_gpio_request_pin;
421                 data->gpio.can_sleep = 1;
422                 data->gpio.base = pdata->gpio_base;
423                 data->gpio.ngpio = data->chip_info->num_leds;
424                 data->gpio.dev = &client->dev;
425                 data->gpio.owner = THIS_MODULE;
426
427                 err = gpiochip_add(&data->gpio);
428                 if (err) {
429                         /* Use data->gpio.dev as a flag for freeing gpiochip */
430                         data->gpio.dev = NULL;
431                         dev_warn(&client->dev, "could not add gpiochip\n");
432                 } else {
433                         dev_info(&client->dev, "gpios %i...%i\n",
434                                 data->gpio.base, data->gpio.base +
435                                 data->gpio.ngpio - 1);
436                 }
437         }
438 #endif
439
440         return 0;
441
442 exit:
443         pca9532_destroy_devices(data, i);
444         return err;
445 }
446
447 static int pca9532_probe(struct i2c_client *client,
448         const struct i2c_device_id *id)
449 {
450         struct pca9532_data *data = i2c_get_clientdata(client);
451         struct pca9532_platform_data *pca9532_pdata = client->dev.platform_data;
452         int err;
453
454         if (!pca9532_pdata)
455                 return -EIO;
456
457         if (!i2c_check_functionality(client->adapter,
458                 I2C_FUNC_SMBUS_BYTE_DATA))
459                 return -EIO;
460
461         data = kzalloc(sizeof(*data), GFP_KERNEL);
462         if (!data)
463                 return -ENOMEM;
464
465         data->chip_info = &pca9532_chip_info_tbl[id->driver_data];
466
467         dev_info(&client->dev, "setting platform data\n");
468         i2c_set_clientdata(client, data);
469         data->client = client;
470         mutex_init(&data->update_lock);
471
472         err = pca9532_configure(client, data, pca9532_pdata);
473         if (err)
474                 kfree(data);
475
476         return err;
477 }
478
479 static int pca9532_remove(struct i2c_client *client)
480 {
481         struct pca9532_data *data = i2c_get_clientdata(client);
482         int err;
483
484         err = pca9532_destroy_devices(data, data->chip_info->num_leds);
485         if (err)
486                 return err;
487
488         kfree(data);
489         return 0;
490 }
491
492 module_i2c_driver(pca9532_driver);
493
494 MODULE_AUTHOR("Riku Voipio");
495 MODULE_LICENSE("GPL");
496 MODULE_DESCRIPTION("PCA 9532 LED dimmer");