Commit | Line | Data |
---|---|---|
e14fa824 RV |
1 | /* |
2 | * pca9532.c - 16-bit Led dimmer | |
3 | * | |
b26e0ed4 | 4 | * Copyright (C) 2008 Riku Voipio |
e14fa824 RV |
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> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
e14fa824 RV |
17 | #include <linux/leds.h> |
18 | #include <linux/input.h> | |
19 | #include <linux/mutex.h> | |
934cd3f9 | 20 | #include <linux/workqueue.h> |
e14fa824 RV |
21 | #include <linux/leds-pca9532.h> |
22 | ||
e14fa824 RV |
23 | #define PCA9532_REG_PSC(i) (0x2+(i)*2) |
24 | #define PCA9532_REG_PWM(i) (0x3+(i)*2) | |
25 | #define PCA9532_REG_LS0 0x6 | |
26 | #define LED_REG(led) ((led>>2)+PCA9532_REG_LS0) | |
27 | #define LED_NUM(led) (led & 0x3) | |
28 | ||
29 | #define ldev_to_led(c) container_of(c, struct pca9532_led, ldev) | |
30 | ||
31 | struct pca9532_data { | |
32 | struct i2c_client *client; | |
33 | struct pca9532_led leds[16]; | |
34 | struct mutex update_lock; | |
85c5204a | 35 | struct input_dev *idev; |
07172d2b | 36 | struct work_struct work; |
e14fa824 RV |
37 | u8 pwm[2]; |
38 | u8 psc[2]; | |
39 | }; | |
40 | ||
41 | static int pca9532_probe(struct i2c_client *client, | |
42 | const struct i2c_device_id *id); | |
43 | static int pca9532_remove(struct i2c_client *client); | |
44 | ||
45 | static const struct i2c_device_id pca9532_id[] = { | |
46 | { "pca9532", 0 }, | |
47 | { } | |
48 | }; | |
49 | ||
50 | MODULE_DEVICE_TABLE(i2c, pca9532_id); | |
51 | ||
52 | static struct i2c_driver pca9532_driver = { | |
53 | .driver = { | |
85c5204a | 54 | .name = "pca9532", |
e14fa824 | 55 | }, |
85c5204a | 56 | .probe = pca9532_probe, |
e14fa824 RV |
57 | .remove = pca9532_remove, |
58 | .id_table = pca9532_id, | |
59 | }; | |
60 | ||
61 | /* We have two pwm/blinkers, but 16 possible leds to drive. Additionaly, | |
62 | * the clever Thecus people are using one pwm to drive the beeper. So, | |
63 | * as a compromise we average one pwm to the values requested by all | |
64 | * leds that are not ON/OFF. | |
65 | * */ | |
934cd3f9 | 66 | static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink, |
e14fa824 RV |
67 | enum led_brightness value) |
68 | { | |
69 | int a = 0, b = 0, i = 0; | |
70 | struct pca9532_data *data = i2c_get_clientdata(client); | |
71 | for (i = 0; i < 16; i++) { | |
72 | if (data->leds[i].type == PCA9532_TYPE_LED && | |
73 | data->leds[i].state == PCA9532_PWM0+pwm) { | |
74 | a++; | |
75 | b += data->leds[i].ldev.brightness; | |
76 | } | |
77 | } | |
78 | if (a == 0) { | |
79 | dev_err(&client->dev, | |
80 | "fear of division by zero %d/%d, wanted %d\n", | |
81 | b, a, value); | |
82 | return -EINVAL; | |
83 | } | |
84 | b = b/a; | |
85 | if (b > 0xFF) | |
86 | return -EINVAL; | |
e14fa824 | 87 | data->pwm[pwm] = b; |
07172d2b AO |
88 | data->psc[pwm] = blink; |
89 | return 0; | |
934cd3f9 RV |
90 | } |
91 | ||
92 | static int pca9532_setpwm(struct i2c_client *client, int pwm) | |
93 | { | |
07172d2b AO |
94 | struct pca9532_data *data = i2c_get_clientdata(client); |
95 | mutex_lock(&data->update_lock); | |
e14fa824 RV |
96 | i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(pwm), |
97 | data->pwm[pwm]); | |
e14fa824 RV |
98 | i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(pwm), |
99 | data->psc[pwm]); | |
100 | mutex_unlock(&data->update_lock); | |
101 | return 0; | |
102 | } | |
103 | ||
104 | /* Set LED routing */ | |
105 | static void pca9532_setled(struct pca9532_led *led) | |
106 | { | |
107 | struct i2c_client *client = led->client; | |
108 | struct pca9532_data *data = i2c_get_clientdata(client); | |
109 | char reg; | |
110 | ||
111 | mutex_lock(&data->update_lock); | |
112 | reg = i2c_smbus_read_byte_data(client, LED_REG(led->id)); | |
113 | /* zero led bits */ | |
114 | reg = reg & ~(0x3<<LED_NUM(led->id)*2); | |
115 | /* set the new value */ | |
116 | reg = reg | (led->state << LED_NUM(led->id)*2); | |
117 | i2c_smbus_write_byte_data(client, LED_REG(led->id), reg); | |
118 | mutex_unlock(&data->update_lock); | |
119 | } | |
120 | ||
121 | static void pca9532_set_brightness(struct led_classdev *led_cdev, | |
122 | enum led_brightness value) | |
123 | { | |
124 | int err = 0; | |
125 | struct pca9532_led *led = ldev_to_led(led_cdev); | |
126 | ||
127 | if (value == LED_OFF) | |
128 | led->state = PCA9532_OFF; | |
129 | else if (value == LED_FULL) | |
130 | led->state = PCA9532_ON; | |
131 | else { | |
132 | led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */ | |
07172d2b | 133 | err = pca9532_calcpwm(led->client, 0, 0, value); |
e14fa824 RV |
134 | if (err) |
135 | return; /* XXX: led api doesn't allow error code? */ | |
136 | } | |
07172d2b | 137 | schedule_work(&led->work); |
e14fa824 RV |
138 | } |
139 | ||
140 | static int pca9532_set_blink(struct led_classdev *led_cdev, | |
141 | unsigned long *delay_on, unsigned long *delay_off) | |
142 | { | |
143 | struct pca9532_led *led = ldev_to_led(led_cdev); | |
144 | struct i2c_client *client = led->client; | |
145 | int psc; | |
07172d2b | 146 | int err = 0; |
e14fa824 RV |
147 | |
148 | if (*delay_on == 0 && *delay_off == 0) { | |
149 | /* led subsystem ask us for a blink rate */ | |
85c5204a | 150 | *delay_on = 1000; |
e14fa824 RV |
151 | *delay_off = 1000; |
152 | } | |
153 | if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6) | |
154 | return -EINVAL; | |
155 | ||
156 | /* Thecus specific: only use PSC/PWM 0 */ | |
157 | psc = (*delay_on * 152-1)/1000; | |
07172d2b AO |
158 | err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness); |
159 | if (err) | |
160 | return err; | |
161 | schedule_work(&led->work); | |
162 | return 0; | |
e14fa824 RV |
163 | } |
164 | ||
0d733579 SW |
165 | static int pca9532_event(struct input_dev *dev, unsigned int type, |
166 | unsigned int code, int value) | |
e14fa824 RV |
167 | { |
168 | struct pca9532_data *data = input_get_drvdata(dev); | |
169 | ||
7fbc3a9b | 170 | if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE))) |
e14fa824 RV |
171 | return -1; |
172 | ||
173 | /* XXX: allow different kind of beeps with psc/pwm modifications */ | |
174 | if (value > 1 && value < 32767) | |
175 | data->pwm[1] = 127; | |
176 | else | |
177 | data->pwm[1] = 0; | |
178 | ||
07172d2b | 179 | schedule_work(&data->work); |
934cd3f9 | 180 | |
07172d2b | 181 | return 0; |
934cd3f9 RV |
182 | } |
183 | ||
184 | static void pca9532_input_work(struct work_struct *work) | |
185 | { | |
07172d2b AO |
186 | struct pca9532_data *data; |
187 | data = container_of(work, struct pca9532_data, work); | |
e14fa824 RV |
188 | mutex_lock(&data->update_lock); |
189 | i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(1), | |
190 | data->pwm[1]); | |
191 | mutex_unlock(&data->update_lock); | |
934cd3f9 | 192 | } |
e14fa824 | 193 | |
934cd3f9 RV |
194 | static void pca9532_led_work(struct work_struct *work) |
195 | { | |
07172d2b AO |
196 | struct pca9532_led *led; |
197 | led = container_of(work, struct pca9532_led, work); | |
198 | if (led->state == PCA9532_PWM0) | |
199 | pca9532_setpwm(led->client, 0); | |
200 | pca9532_setled(led); | |
e14fa824 RV |
201 | } |
202 | ||
203 | static int pca9532_configure(struct i2c_client *client, | |
204 | struct pca9532_data *data, struct pca9532_platform_data *pdata) | |
205 | { | |
206 | int i, err = 0; | |
207 | ||
208 | for (i = 0; i < 2; i++) { | |
209 | data->pwm[i] = pdata->pwm[i]; | |
210 | data->psc[i] = pdata->psc[i]; | |
211 | i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(i), | |
212 | data->pwm[i]); | |
213 | i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(i), | |
214 | data->psc[i]); | |
215 | } | |
216 | ||
217 | for (i = 0; i < 16; i++) { | |
218 | struct pca9532_led *led = &data->leds[i]; | |
219 | struct pca9532_led *pled = &pdata->leds[i]; | |
220 | led->client = client; | |
221 | led->id = i; | |
222 | led->type = pled->type; | |
223 | switch (led->type) { | |
224 | case PCA9532_TYPE_NONE: | |
225 | break; | |
226 | case PCA9532_TYPE_LED: | |
227 | led->state = pled->state; | |
85c5204a | 228 | led->name = pled->name; |
e14fa824 RV |
229 | led->ldev.name = led->name; |
230 | led->ldev.brightness = LED_OFF; | |
231 | led->ldev.brightness_set = pca9532_set_brightness; | |
232 | led->ldev.blink_set = pca9532_set_blink; | |
07172d2b | 233 | INIT_WORK(&led->work, pca9532_led_work); |
f785d022 SW |
234 | err = led_classdev_register(&client->dev, &led->ldev); |
235 | if (err < 0) { | |
e14fa824 RV |
236 | dev_err(&client->dev, |
237 | "couldn't register LED %s\n", | |
238 | led->name); | |
239 | goto exit; | |
240 | } | |
241 | pca9532_setled(led); | |
242 | break; | |
243 | case PCA9532_TYPE_N2100_BEEP: | |
244 | BUG_ON(data->idev); | |
245 | led->state = PCA9532_PWM1; | |
246 | pca9532_setled(led); | |
247 | data->idev = input_allocate_device(); | |
248 | if (data->idev == NULL) { | |
249 | err = -ENOMEM; | |
250 | goto exit; | |
251 | } | |
252 | data->idev->name = pled->name; | |
253 | data->idev->phys = "i2c/pca9532"; | |
254 | data->idev->id.bustype = BUS_HOST; | |
85c5204a | 255 | data->idev->id.vendor = 0x001f; |
e14fa824 RV |
256 | data->idev->id.product = 0x0001; |
257 | data->idev->id.version = 0x0100; | |
258 | data->idev->evbit[0] = BIT_MASK(EV_SND); | |
259 | data->idev->sndbit[0] = BIT_MASK(SND_BELL) | | |
260 | BIT_MASK(SND_TONE); | |
261 | data->idev->event = pca9532_event; | |
262 | input_set_drvdata(data->idev, data); | |
07172d2b | 263 | INIT_WORK(&data->work, pca9532_input_work); |
e14fa824 RV |
264 | err = input_register_device(data->idev); |
265 | if (err) { | |
266 | input_free_device(data->idev); | |
07172d2b | 267 | cancel_work_sync(&data->work); |
e14fa824 RV |
268 | data->idev = NULL; |
269 | goto exit; | |
270 | } | |
271 | break; | |
272 | } | |
273 | } | |
274 | return 0; | |
275 | ||
276 | exit: | |
277 | if (i > 0) | |
278 | for (i = i - 1; i >= 0; i--) | |
279 | switch (data->leds[i].type) { | |
280 | case PCA9532_TYPE_NONE: | |
281 | break; | |
282 | case PCA9532_TYPE_LED: | |
283 | led_classdev_unregister(&data->leds[i].ldev); | |
07172d2b | 284 | cancel_work_sync(&data->leds[i].work); |
e14fa824 RV |
285 | break; |
286 | case PCA9532_TYPE_N2100_BEEP: | |
287 | if (data->idev != NULL) { | |
288 | input_unregister_device(data->idev); | |
289 | input_free_device(data->idev); | |
07172d2b | 290 | cancel_work_sync(&data->work); |
e14fa824 RV |
291 | data->idev = NULL; |
292 | } | |
293 | break; | |
294 | } | |
295 | ||
296 | return err; | |
e14fa824 RV |
297 | } |
298 | ||
299 | static int pca9532_probe(struct i2c_client *client, | |
300 | const struct i2c_device_id *id) | |
301 | { | |
302 | struct pca9532_data *data = i2c_get_clientdata(client); | |
303 | struct pca9532_platform_data *pca9532_pdata = client->dev.platform_data; | |
f785d022 SW |
304 | int err; |
305 | ||
306 | if (!pca9532_pdata) | |
307 | return -EIO; | |
e14fa824 RV |
308 | |
309 | if (!i2c_check_functionality(client->adapter, | |
310 | I2C_FUNC_SMBUS_BYTE_DATA)) | |
311 | return -EIO; | |
312 | ||
f785d022 | 313 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
e14fa824 RV |
314 | if (!data) |
315 | return -ENOMEM; | |
316 | ||
317 | dev_info(&client->dev, "setting platform data\n"); | |
318 | i2c_set_clientdata(client, data); | |
319 | data->client = client; | |
320 | mutex_init(&data->update_lock); | |
321 | ||
f785d022 | 322 | err = pca9532_configure(client, data, pca9532_pdata); |
fbae3fb1 | 323 | if (err) |
f785d022 | 324 | kfree(data); |
e14fa824 | 325 | |
f785d022 | 326 | return err; |
e14fa824 RV |
327 | } |
328 | ||
329 | static int pca9532_remove(struct i2c_client *client) | |
330 | { | |
331 | struct pca9532_data *data = i2c_get_clientdata(client); | |
332 | int i; | |
333 | for (i = 0; i < 16; i++) | |
334 | switch (data->leds[i].type) { | |
335 | case PCA9532_TYPE_NONE: | |
336 | break; | |
337 | case PCA9532_TYPE_LED: | |
338 | led_classdev_unregister(&data->leds[i].ldev); | |
07172d2b | 339 | cancel_work_sync(&data->leds[i].work); |
e14fa824 RV |
340 | break; |
341 | case PCA9532_TYPE_N2100_BEEP: | |
342 | if (data->idev != NULL) { | |
343 | input_unregister_device(data->idev); | |
344 | input_free_device(data->idev); | |
07172d2b | 345 | cancel_work_sync(&data->work); |
e14fa824 RV |
346 | data->idev = NULL; |
347 | } | |
348 | break; | |
349 | } | |
350 | ||
351 | kfree(data); | |
e14fa824 RV |
352 | return 0; |
353 | } | |
354 | ||
355 | static int __init pca9532_init(void) | |
356 | { | |
357 | return i2c_add_driver(&pca9532_driver); | |
358 | } | |
359 | ||
360 | static void __exit pca9532_exit(void) | |
361 | { | |
362 | i2c_del_driver(&pca9532_driver); | |
363 | } | |
364 | ||
b26e0ed4 | 365 | MODULE_AUTHOR("Riku Voipio"); |
e14fa824 RV |
366 | MODULE_LICENSE("GPL"); |
367 | MODULE_DESCRIPTION("PCA 9532 LED dimmer"); | |
368 | ||
369 | module_init(pca9532_init); | |
370 | module_exit(pca9532_exit); | |
371 |