1 /*
2 * pca9532.c - 16-bit Led dimmer
3 *
4 * Copyright (C) 2008 Riku Voipio
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");
371 MODULE_LICENSE("GPL");
372 MODULE_DESCRIPTION("PCA 9532 LED dimmer");
373
374 module_init(pca9532_init);
375 module_exit(pca9532_exit);
376
377
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