Root/drivers/leds/leds-lm3642.c

1/*
2* Simple driver for Texas Instruments LM3642 LED Flash driver chip
3* Copyright (C) 2012 Texas Instruments
4*
5* This program is free software; you can redistribute it and/or modify
6* it under the terms of the GNU General Public License version 2 as
7* published by the Free Software Foundation.
8*
9*/
10#include <linux/module.h>
11#include <linux/delay.h>
12#include <linux/i2c.h>
13#include <linux/leds.h>
14#include <linux/slab.h>
15#include <linux/platform_device.h>
16#include <linux/fs.h>
17#include <linux/regmap.h>
18#include <linux/workqueue.h>
19#include <linux/platform_data/leds-lm3642.h>
20
21#define REG_FILT_TIME (0x0)
22#define REG_IVFM_MODE (0x1)
23#define REG_TORCH_TIME (0x6)
24#define REG_FLASH (0x8)
25#define REG_I_CTRL (0x9)
26#define REG_ENABLE (0xA)
27#define REG_FLAG (0xB)
28#define REG_MAX (0xB)
29
30#define UVLO_EN_SHIFT (7)
31#define IVM_D_TH_SHIFT (2)
32#define TORCH_RAMP_UP_TIME_SHIFT (3)
33#define TORCH_RAMP_DN_TIME_SHIFT (0)
34#define INDUCTOR_I_LIMIT_SHIFT (6)
35#define FLASH_RAMP_TIME_SHIFT (3)
36#define FLASH_TOUT_TIME_SHIFT (0)
37#define TORCH_I_SHIFT (4)
38#define FLASH_I_SHIFT (0)
39#define IVFM_SHIFT (7)
40#define TX_PIN_EN_SHIFT (6)
41#define STROBE_PIN_EN_SHIFT (5)
42#define TORCH_PIN_EN_SHIFT (4)
43#define MODE_BITS_SHIFT (0)
44
45#define UVLO_EN_MASK (0x1)
46#define IVM_D_TH_MASK (0x7)
47#define TORCH_RAMP_UP_TIME_MASK (0x7)
48#define TORCH_RAMP_DN_TIME_MASK (0x7)
49#define INDUCTOR_I_LIMIT_MASK (0x1)
50#define FLASH_RAMP_TIME_MASK (0x7)
51#define FLASH_TOUT_TIME_MASK (0x7)
52#define TORCH_I_MASK (0x7)
53#define FLASH_I_MASK (0xF)
54#define IVFM_MASK (0x1)
55#define TX_PIN_EN_MASK (0x1)
56#define STROBE_PIN_EN_MASK (0x1)
57#define TORCH_PIN_EN_MASK (0x1)
58#define MODE_BITS_MASK (0x73)
59#define EX_PIN_CONTROL_MASK (0x71)
60#define EX_PIN_ENABLE_MASK (0x70)
61
62enum lm3642_mode {
63    MODES_STASNDBY = 0,
64    MODES_INDIC,
65    MODES_TORCH,
66    MODES_FLASH
67};
68
69struct lm3642_chip_data {
70    struct device *dev;
71
72    struct led_classdev cdev_flash;
73    struct led_classdev cdev_torch;
74    struct led_classdev cdev_indicator;
75
76    struct work_struct work_flash;
77    struct work_struct work_torch;
78    struct work_struct work_indicator;
79
80    u8 br_flash;
81    u8 br_torch;
82    u8 br_indicator;
83
84    enum lm3642_torch_pin_enable torch_pin;
85    enum lm3642_strobe_pin_enable strobe_pin;
86    enum lm3642_tx_pin_enable tx_pin;
87
88    struct lm3642_platform_data *pdata;
89    struct regmap *regmap;
90    struct mutex lock;
91
92    unsigned int last_flag;
93};
94
95/* chip initialize */
96static int lm3642_chip_init(struct lm3642_chip_data *chip)
97{
98    int ret;
99    struct lm3642_platform_data *pdata = chip->pdata;
100
101    /* set enable register */
102    ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK,
103                 pdata->tx_pin);
104    if (ret < 0)
105        dev_err(chip->dev, "Failed to update REG_ENABLE Register\n");
106    return ret;
107}
108
109/* chip control */
110static int lm3642_control(struct lm3642_chip_data *chip,
111              u8 brightness, enum lm3642_mode opmode)
112{
113    int ret;
114
115    ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
116    if (ret < 0) {
117        dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
118        goto out;
119    }
120
121    if (chip->last_flag)
122        dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag);
123
124    /* brightness 0 means off-state */
125    if (!brightness)
126        opmode = MODES_STASNDBY;
127
128    switch (opmode) {
129    case MODES_TORCH:
130        ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
131                     TORCH_I_MASK << TORCH_I_SHIFT,
132                     (brightness - 1) << TORCH_I_SHIFT);
133
134        if (chip->torch_pin)
135            opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
136        break;
137
138    case MODES_FLASH:
139        ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
140                     FLASH_I_MASK << FLASH_I_SHIFT,
141                     (brightness - 1) << FLASH_I_SHIFT);
142
143        if (chip->strobe_pin)
144            opmode |= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT);
145        break;
146
147    case MODES_INDIC:
148        ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
149                     TORCH_I_MASK << TORCH_I_SHIFT,
150                     (brightness - 1) << TORCH_I_SHIFT);
151        break;
152
153    case MODES_STASNDBY:
154
155        break;
156
157    default:
158        return ret;
159    }
160    if (ret < 0) {
161        dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
162        goto out;
163    }
164
165    if (chip->tx_pin)
166        opmode |= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT);
167
168    ret = regmap_update_bits(chip->regmap, REG_ENABLE,
169                 MODE_BITS_MASK << MODE_BITS_SHIFT,
170                 opmode << MODE_BITS_SHIFT);
171out:
172    return ret;
173}
174
175/* torch */
176
177/* torch pin config for lm3642*/
178static ssize_t lm3642_torch_pin_store(struct device *dev,
179                      struct device_attribute *attr,
180                      const char *buf, size_t size)
181{
182    ssize_t ret;
183    struct led_classdev *led_cdev = dev_get_drvdata(dev);
184    struct lm3642_chip_data *chip =
185        container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
186    unsigned int state;
187
188    ret = kstrtouint(buf, 10, &state);
189    if (ret)
190        goto out_strtoint;
191    if (state != 0)
192        state = 0x01 << TORCH_PIN_EN_SHIFT;
193
194    chip->torch_pin = state;
195    ret = regmap_update_bits(chip->regmap, REG_ENABLE,
196                 TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT,
197                 state);
198    if (ret < 0)
199        goto out;
200
201    return size;
202out:
203    dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
204    return ret;
205out_strtoint:
206    dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
207    return ret;
208}
209
210static DEVICE_ATTR(torch_pin, S_IWUSR, NULL, lm3642_torch_pin_store);
211
212static void lm3642_deferred_torch_brightness_set(struct work_struct *work)
213{
214    struct lm3642_chip_data *chip =
215        container_of(work, struct lm3642_chip_data, work_torch);
216
217    mutex_lock(&chip->lock);
218    lm3642_control(chip, chip->br_torch, MODES_TORCH);
219    mutex_unlock(&chip->lock);
220}
221
222static void lm3642_torch_brightness_set(struct led_classdev *cdev,
223                    enum led_brightness brightness)
224{
225    struct lm3642_chip_data *chip =
226        container_of(cdev, struct lm3642_chip_data, cdev_torch);
227
228    chip->br_torch = brightness;
229    schedule_work(&chip->work_torch);
230}
231
232/* flash */
233
234/* strobe pin config for lm3642*/
235static ssize_t lm3642_strobe_pin_store(struct device *dev,
236                       struct device_attribute *attr,
237                       const char *buf, size_t size)
238{
239    ssize_t ret;
240    struct led_classdev *led_cdev = dev_get_drvdata(dev);
241    struct lm3642_chip_data *chip =
242        container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
243    unsigned int state;
244
245    ret = kstrtouint(buf, 10, &state);
246    if (ret)
247        goto out_strtoint;
248    if (state != 0)
249        state = 0x01 << STROBE_PIN_EN_SHIFT;
250
251    chip->strobe_pin = state;
252    ret = regmap_update_bits(chip->regmap, REG_ENABLE,
253                 STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT,
254                 state);
255    if (ret < 0)
256        goto out;
257
258    return size;
259out:
260    dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
261    return ret;
262out_strtoint:
263    dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
264    return ret;
265}
266
267static DEVICE_ATTR(strobe_pin, S_IWUSR, NULL, lm3642_strobe_pin_store);
268
269static void lm3642_deferred_strobe_brightness_set(struct work_struct *work)
270{
271    struct lm3642_chip_data *chip =
272        container_of(work, struct lm3642_chip_data, work_flash);
273
274    mutex_lock(&chip->lock);
275    lm3642_control(chip, chip->br_flash, MODES_FLASH);
276    mutex_unlock(&chip->lock);
277}
278
279static void lm3642_strobe_brightness_set(struct led_classdev *cdev,
280                     enum led_brightness brightness)
281{
282    struct lm3642_chip_data *chip =
283        container_of(cdev, struct lm3642_chip_data, cdev_flash);
284
285    chip->br_flash = brightness;
286    schedule_work(&chip->work_flash);
287}
288
289/* indicator */
290static void lm3642_deferred_indicator_brightness_set(struct work_struct *work)
291{
292    struct lm3642_chip_data *chip =
293        container_of(work, struct lm3642_chip_data, work_indicator);
294
295    mutex_lock(&chip->lock);
296    lm3642_control(chip, chip->br_indicator, MODES_INDIC);
297    mutex_unlock(&chip->lock);
298}
299
300static void lm3642_indicator_brightness_set(struct led_classdev *cdev,
301                        enum led_brightness brightness)
302{
303    struct lm3642_chip_data *chip =
304        container_of(cdev, struct lm3642_chip_data, cdev_indicator);
305
306    chip->br_indicator = brightness;
307    schedule_work(&chip->work_indicator);
308}
309
310static const struct regmap_config lm3642_regmap = {
311    .reg_bits = 8,
312    .val_bits = 8,
313    .max_register = REG_MAX,
314};
315
316static int lm3642_probe(struct i2c_client *client,
317                  const struct i2c_device_id *id)
318{
319    struct lm3642_platform_data *pdata = client->dev.platform_data;
320    struct lm3642_chip_data *chip;
321
322    int err;
323
324    if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
325        dev_err(&client->dev, "i2c functionality check fail.\n");
326        return -EOPNOTSUPP;
327    }
328
329    if (pdata == NULL) {
330        dev_err(&client->dev, "needs Platform Data.\n");
331        return -ENODATA;
332    }
333
334    chip = devm_kzalloc(&client->dev,
335                sizeof(struct lm3642_chip_data), GFP_KERNEL);
336    if (!chip)
337        return -ENOMEM;
338
339    chip->dev = &client->dev;
340    chip->pdata = pdata;
341
342    chip->tx_pin = pdata->tx_pin;
343    chip->torch_pin = pdata->torch_pin;
344    chip->strobe_pin = pdata->strobe_pin;
345
346    chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap);
347    if (IS_ERR(chip->regmap)) {
348        err = PTR_ERR(chip->regmap);
349        dev_err(&client->dev, "Failed to allocate register map: %d\n",
350            err);
351        return err;
352    }
353
354    mutex_init(&chip->lock);
355    i2c_set_clientdata(client, chip);
356
357    err = lm3642_chip_init(chip);
358    if (err < 0)
359        goto err_out;
360
361    /* flash */
362    INIT_WORK(&chip->work_flash, lm3642_deferred_strobe_brightness_set);
363    chip->cdev_flash.name = "flash";
364    chip->cdev_flash.max_brightness = 16;
365    chip->cdev_flash.brightness_set = lm3642_strobe_brightness_set;
366    err = led_classdev_register((struct device *)
367                    &client->dev, &chip->cdev_flash);
368    if (err < 0) {
369        dev_err(chip->dev, "failed to register flash\n");
370        goto err_out;
371    }
372    err = device_create_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
373    if (err < 0) {
374        dev_err(chip->dev, "failed to create strobe-pin file\n");
375        goto err_create_flash_pin_file;
376    }
377
378    /* torch */
379    INIT_WORK(&chip->work_torch, lm3642_deferred_torch_brightness_set);
380    chip->cdev_torch.name = "torch";
381    chip->cdev_torch.max_brightness = 8;
382    chip->cdev_torch.brightness_set = lm3642_torch_brightness_set;
383    err = led_classdev_register((struct device *)
384                    &client->dev, &chip->cdev_torch);
385    if (err < 0) {
386        dev_err(chip->dev, "failed to register torch\n");
387        goto err_create_torch_file;
388    }
389    err = device_create_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
390    if (err < 0) {
391        dev_err(chip->dev, "failed to create torch-pin file\n");
392        goto err_create_torch_pin_file;
393    }
394
395    /* indicator */
396    INIT_WORK(&chip->work_indicator,
397          lm3642_deferred_indicator_brightness_set);
398    chip->cdev_indicator.name = "indicator";
399    chip->cdev_indicator.max_brightness = 8;
400    chip->cdev_indicator.brightness_set = lm3642_indicator_brightness_set;
401    err = led_classdev_register((struct device *)
402                    &client->dev, &chip->cdev_indicator);
403    if (err < 0) {
404        dev_err(chip->dev, "failed to register indicator\n");
405        goto err_create_indicator_file;
406    }
407
408    dev_info(&client->dev, "LM3642 is initialized\n");
409    return 0;
410
411err_create_indicator_file:
412    device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
413err_create_torch_pin_file:
414    led_classdev_unregister(&chip->cdev_torch);
415err_create_torch_file:
416    device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
417err_create_flash_pin_file:
418    led_classdev_unregister(&chip->cdev_flash);
419err_out:
420    return err;
421}
422
423static int lm3642_remove(struct i2c_client *client)
424{
425    struct lm3642_chip_data *chip = i2c_get_clientdata(client);
426
427    led_classdev_unregister(&chip->cdev_indicator);
428    flush_work(&chip->work_indicator);
429    device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
430    led_classdev_unregister(&chip->cdev_torch);
431    flush_work(&chip->work_torch);
432    device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
433    led_classdev_unregister(&chip->cdev_flash);
434    flush_work(&chip->work_flash);
435    regmap_write(chip->regmap, REG_ENABLE, 0);
436    return 0;
437}
438
439static const struct i2c_device_id lm3642_id[] = {
440    {LM3642_NAME, 0},
441    {}
442};
443
444MODULE_DEVICE_TABLE(i2c, lm3642_id);
445
446static struct i2c_driver lm3642_i2c_driver = {
447    .driver = {
448           .name = LM3642_NAME,
449           .owner = THIS_MODULE,
450           .pm = NULL,
451           },
452    .probe = lm3642_probe,
453    .remove = lm3642_remove,
454    .id_table = lm3642_id,
455};
456
457module_i2c_driver(lm3642_i2c_driver);
458
459MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642");
460MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
461MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
462MODULE_LICENSE("GPL v2");
463

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