]>
Commit | Line | Data |
---|---|---|
e14fa824 RV |
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/leds-pca9532.h> | |
20 | ||
21 | static const unsigned short normal_i2c[] = { /*0x60,*/ I2C_CLIENT_END}; | |
22 | I2C_CLIENT_INSMOD_1(pca9532); | |
23 | ||
24 | #define PCA9532_REG_PSC(i) (0x2+(i)*2) | |
25 | #define PCA9532_REG_PWM(i) (0x3+(i)*2) | |
26 | #define PCA9532_REG_LS0 0x6 | |
27 | #define LED_REG(led) ((led>>2)+PCA9532_REG_LS0) | |
28 | #define LED_NUM(led) (led & 0x3) | |
29 | ||
30 | #define ldev_to_led(c) container_of(c, struct pca9532_led, ldev) | |
31 | ||
32 | struct pca9532_data { | |
33 | struct i2c_client *client; | |
34 | struct pca9532_led leds[16]; | |
35 | struct mutex update_lock; | |
36 | struct input_dev *idev; | |
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 = { | |
54 | .name = "pca9532", | |
55 | }, | |
56 | .probe = pca9532_probe, | |
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 | * */ | |
66 | static int pca9532_setpwm(struct i2c_client *client, int pwm, int blink, | |
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; | |
87 | mutex_lock(&data->update_lock); | |
88 | data->pwm[pwm] = b; | |
89 | i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(pwm), | |
90 | data->pwm[pwm]); | |
91 | data->psc[pwm] = blink; | |
92 | i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(pwm), | |
93 | data->psc[pwm]); | |
94 | mutex_unlock(&data->update_lock); | |
95 | return 0; | |
96 | } | |
97 | ||
98 | /* Set LED routing */ | |
99 | static void pca9532_setled(struct pca9532_led *led) | |
100 | { | |
101 | struct i2c_client *client = led->client; | |
102 | struct pca9532_data *data = i2c_get_clientdata(client); | |
103 | char reg; | |
104 | ||
105 | mutex_lock(&data->update_lock); | |
106 | reg = i2c_smbus_read_byte_data(client, LED_REG(led->id)); | |
107 | /* zero led bits */ | |
108 | reg = reg & ~(0x3<<LED_NUM(led->id)*2); | |
109 | /* set the new value */ | |
110 | reg = reg | (led->state << LED_NUM(led->id)*2); | |
111 | i2c_smbus_write_byte_data(client, LED_REG(led->id), reg); | |
112 | mutex_unlock(&data->update_lock); | |
113 | } | |
114 | ||
115 | static void pca9532_set_brightness(struct led_classdev *led_cdev, | |
116 | enum led_brightness value) | |
117 | { | |
118 | int err = 0; | |
119 | struct pca9532_led *led = ldev_to_led(led_cdev); | |
120 | ||
121 | if (value == LED_OFF) | |
122 | led->state = PCA9532_OFF; | |
123 | else if (value == LED_FULL) | |
124 | led->state = PCA9532_ON; | |
125 | else { | |
126 | led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */ | |
127 | err = pca9532_setpwm(led->client, 0, 0, value); | |
128 | if (err) | |
129 | return; /* XXX: led api doesn't allow error code? */ | |
130 | } | |
131 | pca9532_setled(led); | |
132 | } | |
133 | ||
134 | static int pca9532_set_blink(struct led_classdev *led_cdev, | |
135 | unsigned long *delay_on, unsigned long *delay_off) | |
136 | { | |
137 | struct pca9532_led *led = ldev_to_led(led_cdev); | |
138 | struct i2c_client *client = led->client; | |
139 | int psc; | |
140 | ||
141 | if (*delay_on == 0 && *delay_off == 0) { | |
142 | /* led subsystem ask us for a blink rate */ | |
143 | *delay_on = 1000; | |
144 | *delay_off = 1000; | |
145 | } | |
146 | if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6) | |
147 | return -EINVAL; | |
148 | ||
149 | /* Thecus specific: only use PSC/PWM 0 */ | |
150 | psc = (*delay_on * 152-1)/1000; | |
151 | return pca9532_setpwm(client, 0, psc, led_cdev->brightness); | |
152 | } | |
153 | ||
154 | int pca9532_event(struct input_dev *dev, unsigned int type, unsigned int code, | |
155 | int value) | |
156 | { | |
157 | struct pca9532_data *data = input_get_drvdata(dev); | |
158 | ||
159 | if (type != EV_SND && (code != SND_BELL || code != SND_TONE)) | |
160 | return -1; | |
161 | ||
162 | /* XXX: allow different kind of beeps with psc/pwm modifications */ | |
163 | if (value > 1 && value < 32767) | |
164 | data->pwm[1] = 127; | |
165 | else | |
166 | data->pwm[1] = 0; | |
167 | ||
168 | dev_info(&dev->dev, "setting beep to %d \n", data->pwm[1]); | |
169 | mutex_lock(&data->update_lock); | |
170 | i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(1), | |
171 | data->pwm[1]); | |
172 | mutex_unlock(&data->update_lock); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | static int pca9532_configure(struct i2c_client *client, | |
178 | struct pca9532_data *data, struct pca9532_platform_data *pdata) | |
179 | { | |
180 | int i, err = 0; | |
181 | ||
182 | for (i = 0; i < 2; i++) { | |
183 | data->pwm[i] = pdata->pwm[i]; | |
184 | data->psc[i] = pdata->psc[i]; | |
185 | i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(i), | |
186 | data->pwm[i]); | |
187 | i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(i), | |
188 | data->psc[i]); | |
189 | } | |
190 | ||
191 | for (i = 0; i < 16; i++) { | |
192 | struct pca9532_led *led = &data->leds[i]; | |
193 | struct pca9532_led *pled = &pdata->leds[i]; | |
194 | led->client = client; | |
195 | led->id = i; | |
196 | led->type = pled->type; | |
197 | switch (led->type) { | |
198 | case PCA9532_TYPE_NONE: | |
199 | break; | |
200 | case PCA9532_TYPE_LED: | |
201 | led->state = pled->state; | |
202 | led->name = pled->name; | |
203 | led->ldev.name = led->name; | |
204 | led->ldev.brightness = LED_OFF; | |
205 | led->ldev.brightness_set = pca9532_set_brightness; | |
206 | led->ldev.blink_set = pca9532_set_blink; | |
207 | if (led_classdev_register(&client->dev, | |
208 | &led->ldev) < 0) { | |
209 | dev_err(&client->dev, | |
210 | "couldn't register LED %s\n", | |
211 | led->name); | |
212 | goto exit; | |
213 | } | |
214 | pca9532_setled(led); | |
215 | break; | |
216 | case PCA9532_TYPE_N2100_BEEP: | |
217 | BUG_ON(data->idev); | |
218 | led->state = PCA9532_PWM1; | |
219 | pca9532_setled(led); | |
220 | data->idev = input_allocate_device(); | |
221 | if (data->idev == NULL) { | |
222 | err = -ENOMEM; | |
223 | goto exit; | |
224 | } | |
225 | data->idev->name = pled->name; | |
226 | data->idev->phys = "i2c/pca9532"; | |
227 | data->idev->id.bustype = BUS_HOST; | |
228 | data->idev->id.vendor = 0x001f; | |
229 | data->idev->id.product = 0x0001; | |
230 | data->idev->id.version = 0x0100; | |
231 | data->idev->evbit[0] = BIT_MASK(EV_SND); | |
232 | data->idev->sndbit[0] = BIT_MASK(SND_BELL) | | |
233 | BIT_MASK(SND_TONE); | |
234 | data->idev->event = pca9532_event; | |
235 | input_set_drvdata(data->idev, data); | |
236 | err = input_register_device(data->idev); | |
237 | if (err) { | |
238 | input_free_device(data->idev); | |
239 | data->idev = NULL; | |
240 | goto exit; | |
241 | } | |
242 | break; | |
243 | } | |
244 | } | |
245 | return 0; | |
246 | ||
247 | exit: | |
248 | if (i > 0) | |
249 | for (i = i - 1; i >= 0; i--) | |
250 | switch (data->leds[i].type) { | |
251 | case PCA9532_TYPE_NONE: | |
252 | break; | |
253 | case PCA9532_TYPE_LED: | |
254 | led_classdev_unregister(&data->leds[i].ldev); | |
255 | break; | |
256 | case PCA9532_TYPE_N2100_BEEP: | |
257 | if (data->idev != NULL) { | |
258 | input_unregister_device(data->idev); | |
259 | input_free_device(data->idev); | |
260 | data->idev = NULL; | |
261 | } | |
262 | break; | |
263 | } | |
264 | ||
265 | return err; | |
266 | ||
267 | } | |
268 | ||
269 | static int pca9532_probe(struct i2c_client *client, | |
270 | const struct i2c_device_id *id) | |
271 | { | |
272 | struct pca9532_data *data = i2c_get_clientdata(client); | |
273 | struct pca9532_platform_data *pca9532_pdata = client->dev.platform_data; | |
274 | ||
275 | if (!i2c_check_functionality(client->adapter, | |
276 | I2C_FUNC_SMBUS_BYTE_DATA)) | |
277 | return -EIO; | |
278 | ||
279 | data = kzalloc(sizeof(struct pca9532_data), GFP_KERNEL); | |
280 | if (!data) | |
281 | return -ENOMEM; | |
282 | ||
283 | dev_info(&client->dev, "setting platform data\n"); | |
284 | i2c_set_clientdata(client, data); | |
285 | data->client = client; | |
286 | mutex_init(&data->update_lock); | |
287 | ||
288 | if (pca9532_pdata == NULL) | |
289 | return -EIO; | |
290 | ||
291 | pca9532_configure(client, data, pca9532_pdata); | |
292 | return 0; | |
293 | ||
294 | } | |
295 | ||
296 | static int pca9532_remove(struct i2c_client *client) | |
297 | { | |
298 | struct pca9532_data *data = i2c_get_clientdata(client); | |
299 | int i; | |
300 | for (i = 0; i < 16; i++) | |
301 | switch (data->leds[i].type) { | |
302 | case PCA9532_TYPE_NONE: | |
303 | break; | |
304 | case PCA9532_TYPE_LED: | |
305 | led_classdev_unregister(&data->leds[i].ldev); | |
306 | break; | |
307 | case PCA9532_TYPE_N2100_BEEP: | |
308 | if (data->idev != NULL) { | |
309 | input_unregister_device(data->idev); | |
310 | input_free_device(data->idev); | |
311 | data->idev = NULL; | |
312 | } | |
313 | break; | |
314 | } | |
315 | ||
316 | kfree(data); | |
317 | i2c_set_clientdata(client, NULL); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | static int __init pca9532_init(void) | |
322 | { | |
323 | return i2c_add_driver(&pca9532_driver); | |
324 | } | |
325 | ||
326 | static void __exit pca9532_exit(void) | |
327 | { | |
328 | i2c_del_driver(&pca9532_driver); | |
329 | } | |
330 | ||
331 | MODULE_AUTHOR("Riku Voipio <riku.voipio@movial.fi>"); | |
332 | MODULE_LICENSE("GPL"); | |
333 | MODULE_DESCRIPTION("PCA 9532 LED dimmer"); | |
334 | ||
335 | module_init(pca9532_init); | |
336 | module_exit(pca9532_exit); | |
337 |