76ec7498e2d5eee3e8d762ec71f2c8c7e54bafd7
[linux-2.6.git] / drivers / leds / leds-pca9532.c
1 /*
2  * pca9532.c - 16-bit Led dimmer
3  *
4  * Copyright (C) 2008 Riku Voipio <riku.voipio@movial.fi>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; version 2 of the License.
9  *
10  * Datasheet: http://www.nxp.com/acrobat/datasheets/PCA9532_3.pdf
11  *
12  */
13
14 #include <linux/module.h>
15 #include <linux/i2c.h>
16 #include <linux/leds.h>
17 #include <linux/input.h>
18 #include <linux/mutex.h>
19 #include <linux/workqueue.h>
20 #include <linux/leds-pca9532.h>
21
22 static const unsigned short normal_i2c[] = { /*0x60,*/ I2C_CLIENT_END};
23 I2C_CLIENT_INSMOD_1(pca9532);
24
25 #define PCA9532_REG_PSC(i) (0x2+(i)*2)
26 #define PCA9532_REG_PWM(i) (0x3+(i)*2)
27 #define PCA9532_REG_LS0  0x6
28 #define LED_REG(led) ((led>>2)+PCA9532_REG_LS0)
29 #define LED_NUM(led) (led & 0x3)
30
31 #define ldev_to_led(c)       container_of(c, struct pca9532_led, ldev)
32
33 struct pca9532_data {
34         struct i2c_client *client;
35         struct pca9532_led leds[16];
36         struct mutex update_lock;
37         struct input_dev    *idev;
38        struct work_struct work;
39         u8 pwm[2];
40         u8 psc[2];
41 };
42
43 static int pca9532_probe(struct i2c_client *client,
44         const struct i2c_device_id *id);
45 static int pca9532_remove(struct i2c_client *client);
46
47 static const struct i2c_device_id pca9532_id[] = {
48         { "pca9532", 0 },
49         { }
50 };
51
52 MODULE_DEVICE_TABLE(i2c, pca9532_id);
53
54 static struct i2c_driver pca9532_driver = {
55         .driver = {
56                 .name   = "pca9532",
57         },
58         .probe  = pca9532_probe,
59         .remove = pca9532_remove,
60         .id_table = pca9532_id,
61 };
62
63 /* We have two pwm/blinkers, but 16 possible leds to drive. Additionaly,
64  * the clever Thecus people are using one pwm to drive the beeper. So,
65  * as a compromise we average one pwm to the values requested by all
66  * leds that are not ON/OFF.
67  * */
68 static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink,
69         enum led_brightness value)
70 {
71         int a = 0, b = 0, i = 0;
72         struct pca9532_data *data = i2c_get_clientdata(client);
73         for (i = 0; i < 16; i++) {
74                 if (data->leds[i].type == PCA9532_TYPE_LED &&
75                         data->leds[i].state == PCA9532_PWM0+pwm) {
76                                 a++;
77                                 b += data->leds[i].ldev.brightness;
78                 }
79         }
80         if (a == 0) {
81                 dev_err(&client->dev,
82                 "fear of division by zero %d/%d, wanted %d\n",
83                         b, a, value);
84                 return -EINVAL;
85         }
86         b = b/a;
87         if (b > 0xFF)
88                 return -EINVAL;
89         data->pwm[pwm] = b;
90        data->psc[pwm] = blink;
91        return 0;
92 }
93
94 static int pca9532_setpwm(struct i2c_client *client, int pwm)
95 {
96        struct pca9532_data *data = i2c_get_clientdata(client);
97        mutex_lock(&data->update_lock);
98         i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(pwm),
99                 data->pwm[pwm]);
100         i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(pwm),
101                 data->psc[pwm]);
102         mutex_unlock(&data->update_lock);
103         return 0;
104 }
105
106 /* Set LED routing */
107 static void pca9532_setled(struct pca9532_led *led)
108 {
109         struct i2c_client *client = led->client;
110         struct pca9532_data *data = i2c_get_clientdata(client);
111         char reg;
112
113         mutex_lock(&data->update_lock);
114         reg = i2c_smbus_read_byte_data(client, LED_REG(led->id));
115         /* zero led bits */
116         reg = reg & ~(0x3<<LED_NUM(led->id)*2);
117         /* set the new value */
118         reg = reg | (led->state << LED_NUM(led->id)*2);
119         i2c_smbus_write_byte_data(client, LED_REG(led->id), reg);
120         mutex_unlock(&data->update_lock);
121 }
122
123 static void pca9532_set_brightness(struct led_classdev *led_cdev,
124         enum led_brightness value)
125 {
126         int err = 0;
127         struct pca9532_led *led = ldev_to_led(led_cdev);
128
129         if (value == LED_OFF)
130                 led->state = PCA9532_OFF;
131         else if (value == LED_FULL)
132                 led->state = PCA9532_ON;
133         else {
134                 led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */
135                err = pca9532_calcpwm(led->client, 0, 0, value);
136                 if (err)
137                         return; /* XXX: led api doesn't allow error code? */
138         }
139        schedule_work(&led->work);
140 }
141
142 static int pca9532_set_blink(struct led_classdev *led_cdev,
143         unsigned long *delay_on, unsigned long *delay_off)
144 {
145         struct pca9532_led *led = ldev_to_led(led_cdev);
146         struct i2c_client *client = led->client;
147         int psc;
148        int err = 0;
149
150         if (*delay_on == 0 && *delay_off == 0) {
151         /* led subsystem ask us for a blink rate */
152                 *delay_on  = 1000;
153                 *delay_off = 1000;
154         }
155         if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6)
156                 return -EINVAL;
157
158         /* Thecus specific: only use PSC/PWM 0 */
159         psc = (*delay_on * 152-1)/1000;
160        err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness);
161        if (err)
162                return err;
163        schedule_work(&led->work);
164        return 0;
165 }
166
167 static int pca9532_event(struct input_dev *dev, unsigned int type,
168         unsigned int code, int value)
169 {
170         struct pca9532_data *data = input_get_drvdata(dev);
171
172         if (type != EV_SND && (code != SND_BELL || code != SND_TONE))
173                 return -1;
174
175         /* XXX: allow different kind of beeps with psc/pwm modifications */
176         if (value > 1 && value < 32767)
177                 data->pwm[1] = 127;
178         else
179                 data->pwm[1] = 0;
180
181        schedule_work(&data->work);
182
183        return 0;
184 }
185
186 static void pca9532_input_work(struct work_struct *work)
187 {
188        struct pca9532_data *data;
189        data = container_of(work, struct pca9532_data, work);
190         mutex_lock(&data->update_lock);
191         i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(1),
192                 data->pwm[1]);
193         mutex_unlock(&data->update_lock);
194 }
195
196 static void pca9532_led_work(struct work_struct *work)
197 {
198        struct pca9532_led *led;
199        led = container_of(work, struct pca9532_led, work);
200        if (led->state == PCA9532_PWM0)
201                pca9532_setpwm(led->client, 0);
202        pca9532_setled(led);
203 }
204
205 static int pca9532_configure(struct i2c_client *client,
206         struct pca9532_data *data, struct pca9532_platform_data *pdata)
207 {
208         int i, err = 0;
209
210         for (i = 0; i < 2; i++) {
211                 data->pwm[i] = pdata->pwm[i];
212                 data->psc[i] = pdata->psc[i];
213                 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(i),
214                         data->pwm[i]);
215                 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(i),
216                         data->psc[i]);
217         }
218
219         for (i = 0; i < 16; i++) {
220                 struct pca9532_led *led = &data->leds[i];
221                 struct pca9532_led *pled = &pdata->leds[i];
222                 led->client = client;
223                 led->id = i;
224                 led->type = pled->type;
225                 switch (led->type) {
226                 case PCA9532_TYPE_NONE:
227                         break;
228                 case PCA9532_TYPE_LED:
229                         led->state = pled->state;
230                         led->name =  pled->name;
231                         led->ldev.name = led->name;
232                         led->ldev.brightness = LED_OFF;
233                         led->ldev.brightness_set = pca9532_set_brightness;
234                         led->ldev.blink_set = pca9532_set_blink;
235                        INIT_WORK(&led->work, pca9532_led_work);
236                         err = led_classdev_register(&client->dev, &led->ldev);
237                         if (err < 0) {
238                                 dev_err(&client->dev,
239                                         "couldn't register LED %s\n",
240                                         led->name);
241                                 goto exit;
242                         }
243                         pca9532_setled(led);
244                         break;
245                 case PCA9532_TYPE_N2100_BEEP:
246                         BUG_ON(data->idev);
247                         led->state = PCA9532_PWM1;
248                         pca9532_setled(led);
249                         data->idev = input_allocate_device();
250                         if (data->idev == NULL) {
251                                 err = -ENOMEM;
252                                 goto exit;
253                         }
254                         data->idev->name = pled->name;
255                         data->idev->phys = "i2c/pca9532";
256                         data->idev->id.bustype = BUS_HOST;
257                         data->idev->id.vendor  = 0x001f;
258                         data->idev->id.product = 0x0001;
259                         data->idev->id.version = 0x0100;
260                         data->idev->evbit[0] = BIT_MASK(EV_SND);
261                         data->idev->sndbit[0] = BIT_MASK(SND_BELL) |
262                                                 BIT_MASK(SND_TONE);
263                         data->idev->event = pca9532_event;
264                         input_set_drvdata(data->idev, data);
265                        INIT_WORK(&data->work, pca9532_input_work);
266                         err = input_register_device(data->idev);
267                         if (err) {
268                                 input_free_device(data->idev);
269                                cancel_work_sync(&data->work);
270                                 data->idev = NULL;
271                                 goto exit;
272                         }
273                         break;
274                 }
275         }
276         return 0;
277
278 exit:
279         if (i > 0)
280                 for (i = i - 1; i >= 0; i--)
281                         switch (data->leds[i].type) {
282                         case PCA9532_TYPE_NONE:
283                                 break;
284                         case PCA9532_TYPE_LED:
285                                 led_classdev_unregister(&data->leds[i].ldev);
286                                cancel_work_sync(&data->leds[i].work);
287                                 break;
288                         case PCA9532_TYPE_N2100_BEEP:
289                                 if (data->idev != NULL) {
290                                         input_unregister_device(data->idev);
291                                         input_free_device(data->idev);
292                                        cancel_work_sync(&data->work);
293                                         data->idev = NULL;
294                                 }
295                                 break;
296                         }
297
298         return err;
299 }
300
301 static int pca9532_probe(struct i2c_client *client,
302         const struct i2c_device_id *id)
303 {
304         struct pca9532_data *data = i2c_get_clientdata(client);
305         struct pca9532_platform_data *pca9532_pdata = client->dev.platform_data;
306         int err;
307
308         if (!pca9532_pdata)
309                 return -EIO;
310
311         if (!i2c_check_functionality(client->adapter,
312                 I2C_FUNC_SMBUS_BYTE_DATA))
313                 return -EIO;
314
315         data = kzalloc(sizeof(*data), GFP_KERNEL);
316         if (!data)
317                 return -ENOMEM;
318
319         dev_info(&client->dev, "setting platform data\n");
320         i2c_set_clientdata(client, data);
321         data->client = client;
322         mutex_init(&data->update_lock);
323
324         err = pca9532_configure(client, data, pca9532_pdata);
325         if (err) {
326                 kfree(data);
327                 i2c_set_clientdata(client, NULL);
328         }
329
330         return err;
331 }
332
333 static int pca9532_remove(struct i2c_client *client)
334 {
335         struct pca9532_data *data = i2c_get_clientdata(client);
336         int i;
337         for (i = 0; i < 16; i++)
338                 switch (data->leds[i].type) {
339                 case PCA9532_TYPE_NONE:
340                         break;
341                 case PCA9532_TYPE_LED:
342                         led_classdev_unregister(&data->leds[i].ldev);
343                        cancel_work_sync(&data->leds[i].work);
344                         break;
345                 case PCA9532_TYPE_N2100_BEEP:
346                         if (data->idev != NULL) {
347                                 input_unregister_device(data->idev);
348                                 input_free_device(data->idev);
349                                cancel_work_sync(&data->work);
350                                 data->idev = NULL;
351                         }
352                         break;
353                 }
354
355         kfree(data);
356         i2c_set_clientdata(client, NULL);
357         return 0;
358 }
359
360 static int __init pca9532_init(void)
361 {
362         return i2c_add_driver(&pca9532_driver);
363 }
364
365 static void __exit pca9532_exit(void)
366 {
367         i2c_del_driver(&pca9532_driver);
368 }
369
370 MODULE_AUTHOR("Riku Voipio <riku.voipio@movial.fi>");
371 MODULE_LICENSE("GPL");
372 MODULE_DESCRIPTION("PCA 9532 LED dimmer");
373
374 module_init(pca9532_init);
375 module_exit(pca9532_exit);
376