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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
35struct pca9532_chip_info {
36 u8 num_leds;
37};
38
39struct 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
53static int pca9532_probe(struct i2c_client *client,
54 const struct i2c_device_id *id);
55static int pca9532_remove(struct i2c_client *client);
56
57enum {
58 pca9530,
59 pca9531,
60 pca9532,
61 pca9533,
62};
63
64static const struct i2c_device_id pca9532_id[] = {
65 { "pca9530", pca9530 },
66 { "pca9531", pca9531 },
67 { "pca9532", pca9532 },
68 { "pca9533", pca9533 },
69 { }
70};
71
72MODULE_DEVICE_TABLE(i2c, pca9532_id);
73
74static 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
89static 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 * */
103static 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
129static 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 */
144static 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
161static 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
180static 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
205static 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
224static 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
236static 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
246static 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
257static 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
270static 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
280static 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
288static 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
296static 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
336static 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
442exit:
443 pca9532_destroy_devices(data, i);
444 return err;
445}
446
447static 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
479static 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
492module_i2c_driver(pca9532_driver);
493
494MODULE_AUTHOR("Riku Voipio");
495MODULE_LICENSE("GPL");
496MODULE_DESCRIPTION("PCA 9532 LED dimmer");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * pca9532.c - 16-bit Led dimmer
4 *
5 * Copyright (C) 2011 Jan Weitzel
6 * Copyright (C) 2008 Riku Voipio
7 *
8 * Datasheet: http://www.nxp.com/documents/data_sheet/PCA9532.pdf
9 */
10
11#include <linux/module.h>
12#include <linux/i2c.h>
13#include <linux/slab.h>
14#include <linux/leds.h>
15#include <linux/input.h>
16#include <linux/mutex.h>
17#include <linux/workqueue.h>
18#include <linux/leds-pca9532.h>
19#include <linux/gpio/driver.h>
20#include <linux/of.h>
21
22/* m = num_leds*/
23#define PCA9532_REG_INPUT(i) ((i) >> 3)
24#define PCA9532_REG_OFFSET(m) ((m) >> 4)
25#define PCA9532_REG_PSC(m, i) (PCA9532_REG_OFFSET(m) + 0x1 + (i) * 2)
26#define PCA9532_REG_PWM(m, i) (PCA9532_REG_OFFSET(m) + 0x2 + (i) * 2)
27#define LED_REG(m, led) (PCA9532_REG_OFFSET(m) + 0x5 + (led >> 2))
28#define LED_NUM(led) (led & 0x3)
29#define LED_SHIFT(led) (LED_NUM(led) * 2)
30#define LED_MASK(led) (0x3 << LED_SHIFT(led))
31
32#define PCA9532_PWM_PERIOD_DIV 152
33#define PCA9532_PWM_DUTY_DIV 256
34
35#define ldev_to_led(c) container_of(c, struct pca9532_led, ldev)
36
37struct pca9532_chip_info {
38 u8 num_leds;
39};
40
41struct pca9532_data {
42 struct i2c_client *client;
43 struct pca9532_led leds[16];
44 struct mutex update_lock;
45 struct input_dev *idev;
46 struct work_struct work;
47#ifdef CONFIG_LEDS_PCA9532_GPIO
48 struct gpio_chip gpio;
49#endif
50 const struct pca9532_chip_info *chip_info;
51
52#define PCA9532_PWM_ID_0 0
53#define PCA9532_PWM_ID_1 1
54 u8 pwm[2];
55 u8 psc[2];
56 bool hw_blink;
57};
58
59static int pca9532_probe(struct i2c_client *client);
60static void pca9532_remove(struct i2c_client *client);
61
62enum {
63 pca9530,
64 pca9531,
65 pca9532,
66 pca9533,
67};
68
69static const struct i2c_device_id pca9532_id[] = {
70 { "pca9530", pca9530 },
71 { "pca9531", pca9531 },
72 { "pca9532", pca9532 },
73 { "pca9533", pca9533 },
74 { }
75};
76
77MODULE_DEVICE_TABLE(i2c, pca9532_id);
78
79static const struct pca9532_chip_info pca9532_chip_info_tbl[] = {
80 [pca9530] = {
81 .num_leds = 2,
82 },
83 [pca9531] = {
84 .num_leds = 8,
85 },
86 [pca9532] = {
87 .num_leds = 16,
88 },
89 [pca9533] = {
90 .num_leds = 4,
91 },
92};
93
94#ifdef CONFIG_OF
95static const struct of_device_id of_pca9532_leds_match[] = {
96 { .compatible = "nxp,pca9530", .data = (void *)pca9530 },
97 { .compatible = "nxp,pca9531", .data = (void *)pca9531 },
98 { .compatible = "nxp,pca9532", .data = (void *)pca9532 },
99 { .compatible = "nxp,pca9533", .data = (void *)pca9533 },
100 {},
101};
102
103MODULE_DEVICE_TABLE(of, of_pca9532_leds_match);
104#endif
105
106static struct i2c_driver pca9532_driver = {
107 .driver = {
108 .name = "leds-pca953x",
109 .of_match_table = of_match_ptr(of_pca9532_leds_match),
110 },
111 .probe = pca9532_probe,
112 .remove = pca9532_remove,
113 .id_table = pca9532_id,
114};
115
116/* We have two pwm/blinkers, but 16 possible leds to drive. Additionally,
117 * the clever Thecus people are using one pwm to drive the beeper. So,
118 * as a compromise we average one pwm to the values requested by all
119 * leds that are not ON/OFF.
120 * */
121static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink,
122 enum led_brightness value)
123{
124 int a = 0, b = 0, i = 0;
125 struct pca9532_data *data = i2c_get_clientdata(client);
126 for (i = 0; i < data->chip_info->num_leds; i++) {
127 if (data->leds[i].type == PCA9532_TYPE_LED &&
128 data->leds[i].state == PCA9532_PWM0+pwm) {
129 a++;
130 b += data->leds[i].ldev.brightness;
131 }
132 }
133 if (a == 0) {
134 dev_err(&client->dev,
135 "fear of division by zero %d/%d, wanted %d\n",
136 b, a, value);
137 return -EINVAL;
138 }
139 b = b/a;
140 if (b > 0xFF)
141 return -EINVAL;
142 data->pwm[pwm] = b;
143 data->psc[pwm] = blink;
144 return 0;
145}
146
147static int pca9532_setpwm(struct i2c_client *client, int pwm)
148{
149 struct pca9532_data *data = i2c_get_clientdata(client);
150 u8 maxleds = data->chip_info->num_leds;
151
152 mutex_lock(&data->update_lock);
153 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, pwm),
154 data->pwm[pwm]);
155 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, pwm),
156 data->psc[pwm]);
157 mutex_unlock(&data->update_lock);
158 return 0;
159}
160
161/* Set LED routing */
162static void pca9532_setled(struct pca9532_led *led)
163{
164 struct i2c_client *client = led->client;
165 struct pca9532_data *data = i2c_get_clientdata(client);
166 u8 maxleds = data->chip_info->num_leds;
167 char reg;
168
169 mutex_lock(&data->update_lock);
170 reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id));
171 /* zero led bits */
172 reg = reg & ~LED_MASK(led->id);
173 /* set the new value */
174 reg = reg | (led->state << LED_SHIFT(led->id));
175 i2c_smbus_write_byte_data(client, LED_REG(maxleds, led->id), reg);
176 mutex_unlock(&data->update_lock);
177}
178
179static int pca9532_set_brightness(struct led_classdev *led_cdev,
180 enum led_brightness value)
181{
182 int err = 0;
183 struct pca9532_led *led = ldev_to_led(led_cdev);
184
185 if (value == LED_OFF)
186 led->state = PCA9532_OFF;
187 else if (value == LED_FULL)
188 led->state = PCA9532_ON;
189 else {
190 led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */
191 err = pca9532_calcpwm(led->client, PCA9532_PWM_ID_0, 0, value);
192 if (err)
193 return err;
194 }
195 if (led->state == PCA9532_PWM0)
196 pca9532_setpwm(led->client, PCA9532_PWM_ID_0);
197 pca9532_setled(led);
198 return err;
199}
200
201static int pca9532_update_hw_blink(struct pca9532_led *led,
202 unsigned long delay_on, unsigned long delay_off)
203{
204 struct pca9532_data *data = i2c_get_clientdata(led->client);
205 unsigned int psc;
206 int i;
207
208 /* Look for others LEDs that already use PWM1 */
209 for (i = 0; i < data->chip_info->num_leds; i++) {
210 struct pca9532_led *other = &data->leds[i];
211
212 if (other == led)
213 continue;
214
215 if (other->state == PCA9532_PWM1) {
216 if (other->ldev.blink_delay_on != delay_on ||
217 other->ldev.blink_delay_off != delay_off) {
218 /* HW can handle only one blink configuration at a time */
219 return -EINVAL;
220 }
221 }
222 }
223
224 psc = ((delay_on + delay_off) * PCA9532_PWM_PERIOD_DIV - 1) / 1000;
225 if (psc > U8_MAX) {
226 /* Blink period too long to be handled by hardware */
227 return -EINVAL;
228 }
229
230 led->state = PCA9532_PWM1;
231 data->psc[PCA9532_PWM_ID_1] = psc;
232 data->pwm[PCA9532_PWM_ID_1] = (delay_on * PCA9532_PWM_DUTY_DIV) / (delay_on + delay_off);
233
234 return pca9532_setpwm(data->client, PCA9532_PWM_ID_1);
235}
236
237static int pca9532_set_blink(struct led_classdev *led_cdev,
238 unsigned long *delay_on, unsigned long *delay_off)
239{
240 struct pca9532_led *led = ldev_to_led(led_cdev);
241 struct i2c_client *client = led->client;
242 struct pca9532_data *data = i2c_get_clientdata(client);
243 int err;
244
245 if (!data->hw_blink)
246 return -EINVAL;
247
248 if (*delay_on == 0 && *delay_off == 0) {
249 /* led subsystem ask us for a blink rate */
250 *delay_on = 500;
251 *delay_off = 500;
252 }
253
254 err = pca9532_update_hw_blink(led, *delay_on, *delay_off);
255 if (err)
256 return err;
257
258 pca9532_setled(led);
259
260 return 0;
261}
262
263static int pca9532_event(struct input_dev *dev, unsigned int type,
264 unsigned int code, int value)
265{
266 struct pca9532_data *data = input_get_drvdata(dev);
267
268 if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE)))
269 return -1;
270
271 /* XXX: allow different kind of beeps with psc/pwm modifications */
272 if (value > 1 && value < 32767)
273 data->pwm[PCA9532_PWM_ID_1] = 127;
274 else
275 data->pwm[PCA9532_PWM_ID_1] = 0;
276
277 schedule_work(&data->work);
278
279 return 0;
280}
281
282static void pca9532_input_work(struct work_struct *work)
283{
284 struct pca9532_data *data =
285 container_of(work, struct pca9532_data, work);
286 u8 maxleds = data->chip_info->num_leds;
287
288 mutex_lock(&data->update_lock);
289 i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(maxleds, 1),
290 data->pwm[PCA9532_PWM_ID_1]);
291 mutex_unlock(&data->update_lock);
292}
293
294static enum pca9532_state pca9532_getled(struct pca9532_led *led)
295{
296 struct i2c_client *client = led->client;
297 struct pca9532_data *data = i2c_get_clientdata(client);
298 u8 maxleds = data->chip_info->num_leds;
299 char reg;
300 enum pca9532_state ret;
301
302 mutex_lock(&data->update_lock);
303 reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id));
304 ret = (reg & LED_MASK(led->id)) >> LED_SHIFT(led->id);
305 mutex_unlock(&data->update_lock);
306 return ret;
307}
308
309#ifdef CONFIG_LEDS_PCA9532_GPIO
310static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset)
311{
312 struct pca9532_data *data = gpiochip_get_data(gc);
313 struct pca9532_led *led = &data->leds[offset];
314
315 if (led->type == PCA9532_TYPE_GPIO)
316 return 0;
317
318 return -EBUSY;
319}
320
321static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val)
322{
323 struct pca9532_data *data = gpiochip_get_data(gc);
324 struct pca9532_led *led = &data->leds[offset];
325
326 if (val)
327 led->state = PCA9532_ON;
328 else
329 led->state = PCA9532_OFF;
330
331 pca9532_setled(led);
332}
333
334static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset)
335{
336 struct pca9532_data *data = gpiochip_get_data(gc);
337 unsigned char reg;
338
339 reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset));
340
341 return !!(reg & (1 << (offset % 8)));
342}
343
344static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
345{
346 /* To use as input ensure pin is not driven */
347 pca9532_gpio_set_value(gc, offset, 0);
348
349 return 0;
350}
351
352static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val)
353{
354 pca9532_gpio_set_value(gc, offset, val);
355
356 return 0;
357}
358#endif /* CONFIG_LEDS_PCA9532_GPIO */
359
360static void pca9532_destroy_devices(struct pca9532_data *data, int n_devs)
361{
362 int i = n_devs;
363
364 while (--i >= 0) {
365 switch (data->leds[i].type) {
366 case PCA9532_TYPE_NONE:
367 case PCA9532_TYPE_GPIO:
368 break;
369 case PCA9532_TYPE_LED:
370 led_classdev_unregister(&data->leds[i].ldev);
371 break;
372 case PCA9532_TYPE_N2100_BEEP:
373 if (data->idev != NULL) {
374 cancel_work_sync(&data->work);
375 data->idev = NULL;
376 }
377 break;
378 }
379 }
380
381#ifdef CONFIG_LEDS_PCA9532_GPIO
382 if (data->gpio.parent)
383 gpiochip_remove(&data->gpio);
384#endif
385}
386
387static int pca9532_configure(struct i2c_client *client,
388 struct pca9532_data *data, struct pca9532_platform_data *pdata)
389{
390 int i, err = 0;
391 int gpios = 0;
392 u8 maxleds = data->chip_info->num_leds;
393
394 for (i = 0; i < 2; i++) {
395 data->pwm[i] = pdata->pwm[i];
396 data->psc[i] = pdata->psc[i];
397 i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, i),
398 data->pwm[i]);
399 i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i),
400 data->psc[i]);
401 }
402
403 data->hw_blink = true;
404 for (i = 0; i < data->chip_info->num_leds; i++) {
405 struct pca9532_led *led = &data->leds[i];
406 struct pca9532_led *pled = &pdata->leds[i];
407 led->client = client;
408 led->id = i;
409 led->type = pled->type;
410 switch (led->type) {
411 case PCA9532_TYPE_NONE:
412 break;
413 case PCA9532_TYPE_GPIO:
414 gpios++;
415 break;
416 case PCA9532_TYPE_LED:
417 if (pled->state == PCA9532_KEEP)
418 led->state = pca9532_getled(led);
419 else
420 led->state = pled->state;
421 led->name = pled->name;
422 led->ldev.name = led->name;
423 led->ldev.default_trigger = pled->default_trigger;
424 led->ldev.brightness = LED_OFF;
425 led->ldev.brightness_set_blocking =
426 pca9532_set_brightness;
427 led->ldev.blink_set = pca9532_set_blink;
428 err = led_classdev_register(&client->dev, &led->ldev);
429 if (err < 0) {
430 dev_err(&client->dev,
431 "couldn't register LED %s\n",
432 led->name);
433 goto exit;
434 }
435 pca9532_setled(led);
436 break;
437 case PCA9532_TYPE_N2100_BEEP:
438 /* PWM1 is reserved for beeper so blink will not use hardware */
439 data->hw_blink = false;
440 BUG_ON(data->idev);
441 led->state = PCA9532_PWM1;
442 pca9532_setled(led);
443 data->idev = devm_input_allocate_device(&client->dev);
444 if (data->idev == NULL) {
445 err = -ENOMEM;
446 goto exit;
447 }
448 data->idev->name = pled->name;
449 data->idev->phys = "i2c/pca9532";
450 data->idev->id.bustype = BUS_HOST;
451 data->idev->id.vendor = 0x001f;
452 data->idev->id.product = 0x0001;
453 data->idev->id.version = 0x0100;
454 data->idev->evbit[0] = BIT_MASK(EV_SND);
455 data->idev->sndbit[0] = BIT_MASK(SND_BELL) |
456 BIT_MASK(SND_TONE);
457 data->idev->event = pca9532_event;
458 input_set_drvdata(data->idev, data);
459 INIT_WORK(&data->work, pca9532_input_work);
460 err = input_register_device(data->idev);
461 if (err) {
462 cancel_work_sync(&data->work);
463 data->idev = NULL;
464 goto exit;
465 }
466 break;
467 }
468 }
469
470#ifdef CONFIG_LEDS_PCA9532_GPIO
471 if (gpios) {
472 data->gpio.label = "gpio-pca9532";
473 data->gpio.direction_input = pca9532_gpio_direction_input;
474 data->gpio.direction_output = pca9532_gpio_direction_output;
475 data->gpio.set = pca9532_gpio_set_value;
476 data->gpio.get = pca9532_gpio_get_value;
477 data->gpio.request = pca9532_gpio_request_pin;
478 data->gpio.can_sleep = 1;
479 data->gpio.base = pdata->gpio_base;
480 data->gpio.ngpio = data->chip_info->num_leds;
481 data->gpio.parent = &client->dev;
482 data->gpio.owner = THIS_MODULE;
483
484 err = gpiochip_add_data(&data->gpio, data);
485 if (err) {
486 /* Use data->gpio.dev as a flag for freeing gpiochip */
487 data->gpio.parent = NULL;
488 dev_warn(&client->dev, "could not add gpiochip\n");
489 } else {
490 dev_info(&client->dev, "gpios %i...%i\n",
491 data->gpio.base, data->gpio.base +
492 data->gpio.ngpio - 1);
493 }
494 }
495#endif
496
497 return 0;
498
499exit:
500 pca9532_destroy_devices(data, i);
501 return err;
502}
503
504static struct pca9532_platform_data *
505pca9532_of_populate_pdata(struct device *dev, struct device_node *np)
506{
507 struct pca9532_platform_data *pdata;
508 int devid, maxleds;
509 int i = 0;
510 const char *state;
511
512 devid = (int)(uintptr_t)of_device_get_match_data(dev);
513 maxleds = pca9532_chip_info_tbl[devid].num_leds;
514
515 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
516 if (!pdata)
517 return ERR_PTR(-ENOMEM);
518
519 pdata->gpio_base = -1;
520
521 of_property_read_u8_array(np, "nxp,pwm", &pdata->pwm[PCA9532_PWM_ID_0],
522 ARRAY_SIZE(pdata->pwm));
523 of_property_read_u8_array(np, "nxp,psc", &pdata->psc[PCA9532_PWM_ID_0],
524 ARRAY_SIZE(pdata->psc));
525
526 for_each_available_child_of_node_scoped(np, child) {
527 if (of_property_read_string(child, "label",
528 &pdata->leds[i].name))
529 pdata->leds[i].name = child->name;
530 of_property_read_u32(child, "type", &pdata->leds[i].type);
531 of_property_read_string(child, "linux,default-trigger",
532 &pdata->leds[i].default_trigger);
533 if (!of_property_read_string(child, "default-state", &state)) {
534 if (!strcmp(state, "on"))
535 pdata->leds[i].state = PCA9532_ON;
536 else if (!strcmp(state, "keep"))
537 pdata->leds[i].state = PCA9532_KEEP;
538 }
539 if (++i >= maxleds)
540 break;
541 }
542
543 return pdata;
544}
545
546static int pca9532_probe(struct i2c_client *client)
547{
548 const struct i2c_device_id *id = i2c_client_get_device_id(client);
549 int devid;
550 struct pca9532_data *data = i2c_get_clientdata(client);
551 struct pca9532_platform_data *pca9532_pdata =
552 dev_get_platdata(&client->dev);
553 struct device_node *np = dev_of_node(&client->dev);
554
555 if (!pca9532_pdata) {
556 if (np) {
557 pca9532_pdata =
558 pca9532_of_populate_pdata(&client->dev, np);
559 if (IS_ERR(pca9532_pdata))
560 return PTR_ERR(pca9532_pdata);
561 } else {
562 dev_err(&client->dev, "no platform data\n");
563 return -EINVAL;
564 }
565 devid = (int)(uintptr_t)of_device_get_match_data(&client->dev);
566 } else {
567 devid = id->driver_data;
568 }
569
570 if (!i2c_check_functionality(client->adapter,
571 I2C_FUNC_SMBUS_BYTE_DATA))
572 return -EIO;
573
574 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
575 if (!data)
576 return -ENOMEM;
577
578 data->chip_info = &pca9532_chip_info_tbl[devid];
579
580 dev_info(&client->dev, "setting platform data\n");
581 i2c_set_clientdata(client, data);
582 data->client = client;
583 mutex_init(&data->update_lock);
584
585 return pca9532_configure(client, data, pca9532_pdata);
586}
587
588static void pca9532_remove(struct i2c_client *client)
589{
590 struct pca9532_data *data = i2c_get_clientdata(client);
591
592 pca9532_destroy_devices(data, data->chip_info->num_leds);
593}
594
595module_i2c_driver(pca9532_driver);
596
597MODULE_AUTHOR("Riku Voipio");
598MODULE_LICENSE("GPL");
599MODULE_DESCRIPTION("PCA 9532 LED dimmer");