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25#include <linux/delay.h>
26#include <linux/firmware.h>
27#include <linux/i2c.h>
28#include <linux/init.h>
29#include <linux/leds.h>
30#include <linux/module.h>
31#include <linux/mutex.h>
32#include <linux/platform_data/leds-lp55xx.h>
33#include <linux/slab.h>
34
35#include "leds-lp55xx-common.h"
36
37#define LP5521_PROGRAM_LENGTH 32
38#define LP5521_MAX_LEDS 3
39#define LP5521_CMD_DIRECT 0x3F
40
41
42#define LP5521_REG_ENABLE 0x00
43#define LP5521_REG_OP_MODE 0x01
44#define LP5521_REG_R_PWM 0x02
45#define LP5521_REG_G_PWM 0x03
46#define LP5521_REG_B_PWM 0x04
47#define LP5521_REG_R_CURRENT 0x05
48#define LP5521_REG_G_CURRENT 0x06
49#define LP5521_REG_B_CURRENT 0x07
50#define LP5521_REG_CONFIG 0x08
51#define LP5521_REG_STATUS 0x0C
52#define LP5521_REG_RESET 0x0D
53#define LP5521_REG_R_PROG_MEM 0x10
54#define LP5521_REG_G_PROG_MEM 0x30
55#define LP5521_REG_B_PROG_MEM 0x50
56
57
58#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
59
60#define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
61
62
63#define LP5521_MASTER_ENABLE 0x40
64#define LP5521_LOGARITHMIC_PWM 0x80
65#define LP5521_EXEC_RUN 0x2A
66#define LP5521_ENABLE_DEFAULT \
67 (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
68#define LP5521_ENABLE_RUN_PROGRAM \
69 (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
70
71
72#define LP5521_PWM_HF 0x40
73#define LP5521_PWRSAVE_EN 0x20
74#define LP5521_CP_MODE_OFF 0
75#define LP5521_CP_MODE_BYPASS 8
76#define LP5521_CP_MODE_1X5 0x10
77#define LP5521_CP_MODE_AUTO 0x18
78#define LP5521_R_TO_BATT 0x04
79#define LP5521_CLK_INT 0x01
80#define LP5521_DEFAULT_CFG \
81 (LP5521_PWM_HF | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO)
82
83
84#define LP5521_EXT_CLK_USED 0x08
85
86
87#define LP5521_REG_R_CURR_DEFAULT 0xAF
88
89
90#define LP5521_RESET 0xFF
91
92
93#define LP5521_MODE_R_M 0x30
94#define LP5521_MODE_G_M 0x0C
95#define LP5521_MODE_B_M 0x03
96#define LP5521_LOAD_R 0x10
97#define LP5521_LOAD_G 0x04
98#define LP5521_LOAD_B 0x01
99
100#define LP5521_R_IS_LOADING(mode) \
101 ((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
102#define LP5521_G_IS_LOADING(mode) \
103 ((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
104#define LP5521_B_IS_LOADING(mode) \
105 ((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)
106
107#define LP5521_EXEC_R_M 0x30
108#define LP5521_EXEC_G_M 0x0C
109#define LP5521_EXEC_B_M 0x03
110#define LP5521_EXEC_M 0x3F
111#define LP5521_RUN_R 0x20
112#define LP5521_RUN_G 0x08
113#define LP5521_RUN_B 0x02
114
115static inline void lp5521_wait_opmode_done(void)
116{
117
118 usleep_range(200, 300);
119}
120
121static inline void lp5521_wait_enable_done(void)
122{
123
124 usleep_range(500, 600);
125}
126
127static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
128{
129 led->led_current = led_current;
130 lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
131 led_current);
132}
133
134static void lp5521_load_engine(struct lp55xx_chip *chip)
135{
136 enum lp55xx_engine_index idx = chip->engine_idx;
137 u8 mask[] = {
138 [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
139 [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
140 [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
141 };
142
143 u8 val[] = {
144 [LP55XX_ENGINE_1] = LP5521_LOAD_R,
145 [LP55XX_ENGINE_2] = LP5521_LOAD_G,
146 [LP55XX_ENGINE_3] = LP5521_LOAD_B,
147 };
148
149 lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);
150
151 lp5521_wait_opmode_done();
152}
153
154static void lp5521_stop_engine(struct lp55xx_chip *chip)
155{
156 lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
157 lp5521_wait_opmode_done();
158}
159
160static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
161{
162 int ret;
163 u8 mode;
164 u8 exec;
165
166
167 if (!start) {
168 lp5521_stop_engine(chip);
169 lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
170 lp5521_wait_opmode_done();
171 return;
172 }
173
174
175
176
177
178
179 ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);
180 if (ret)
181 return;
182
183 ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
184 if (ret)
185 return;
186
187
188 if (LP5521_R_IS_LOADING(mode)) {
189 mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R;
190 exec = (exec & ~LP5521_EXEC_R_M) | LP5521_RUN_R;
191 }
192
193 if (LP5521_G_IS_LOADING(mode)) {
194 mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G;
195 exec = (exec & ~LP5521_EXEC_G_M) | LP5521_RUN_G;
196 }
197
198 if (LP5521_B_IS_LOADING(mode)) {
199 mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B;
200 exec = (exec & ~LP5521_EXEC_B_M) | LP5521_RUN_B;
201 }
202
203 lp55xx_write(chip, LP5521_REG_OP_MODE, mode);
204 lp5521_wait_opmode_done();
205
206 lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec);
207 lp5521_wait_enable_done();
208}
209
210static int lp5521_update_program_memory(struct lp55xx_chip *chip,
211 const u8 *data, size_t size)
212{
213 enum lp55xx_engine_index idx = chip->engine_idx;
214 u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
215 u8 addr[] = {
216 [LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
217 [LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
218 [LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,
219 };
220 unsigned cmd;
221 char c[3];
222 int program_size;
223 int nrchars;
224 int offset = 0;
225 int ret;
226 int i;
227
228
229 for (i = 0; i < LP5521_PROGRAM_LENGTH; i++)
230 lp55xx_write(chip, addr[idx] + i, 0);
231
232 i = 0;
233 while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
234
235 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
236 if (ret != 1)
237 goto err;
238
239 ret = sscanf(c, "%2x", &cmd);
240 if (ret != 1)
241 goto err;
242
243 pattern[i] = (u8)cmd;
244 offset += nrchars;
245 i++;
246 }
247
248
249 if (i % 2)
250 goto err;
251
252 program_size = i;
253 for (i = 0; i < program_size; i++)
254 lp55xx_write(chip, addr[idx] + i, pattern[i]);
255
256 return 0;
257
258err:
259 dev_err(&chip->cl->dev, "wrong pattern format\n");
260 return -EINVAL;
261}
262
263static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
264{
265 const struct firmware *fw = chip->fw;
266
267 if (fw->size > LP5521_PROGRAM_LENGTH) {
268 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
269 fw->size);
270 return;
271 }
272
273
274
275
276
277
278
279 lp5521_load_engine(chip);
280 lp5521_update_program_memory(chip, fw->data, fw->size);
281}
282
283static int lp5521_post_init_device(struct lp55xx_chip *chip)
284{
285 int ret;
286 u8 val;
287
288
289
290
291
292
293
294 ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
295 if (ret) {
296 dev_err(&chip->cl->dev, "error in resetting chip\n");
297 return ret;
298 }
299 if (val != LP5521_REG_R_CURR_DEFAULT) {
300 dev_err(&chip->cl->dev,
301 "unexpected data in register (expected 0x%x got 0x%x)\n",
302 LP5521_REG_R_CURR_DEFAULT, val);
303 ret = -EINVAL;
304 return ret;
305 }
306 usleep_range(10000, 20000);
307
308
309 ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
310
311
312 val = LP5521_DEFAULT_CFG;
313 if (!lp55xx_is_extclk_used(chip))
314 val |= LP5521_CLK_INT;
315
316 ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
317 if (ret)
318 return ret;
319
320
321 lp55xx_write(chip, LP5521_REG_R_PWM, 0);
322 lp55xx_write(chip, LP5521_REG_G_PWM, 0);
323 lp55xx_write(chip, LP5521_REG_B_PWM, 0);
324
325
326 ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
327 if (ret)
328 return ret;
329
330 lp5521_wait_enable_done();
331
332 return 0;
333}
334
335static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
336{
337 struct lp55xx_platform_data *pdata = chip->pdata;
338 int ret;
339 u8 status;
340
341 ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
342 if (ret < 0)
343 return ret;
344
345 if (pdata->clock_mode != LP55XX_CLOCK_EXT)
346 return 0;
347
348
349 if ((status & LP5521_EXT_CLK_USED) == 0)
350 return -EIO;
351
352 return 0;
353}
354
355static void lp5521_led_brightness_work(struct work_struct *work)
356{
357 struct lp55xx_led *led = container_of(work, struct lp55xx_led,
358 brightness_work);
359 struct lp55xx_chip *chip = led->chip;
360
361 mutex_lock(&chip->lock);
362 lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
363 led->brightness);
364 mutex_unlock(&chip->lock);
365}
366
367static ssize_t lp5521_selftest(struct device *dev,
368 struct device_attribute *attr,
369 char *buf)
370{
371 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
372 struct lp55xx_chip *chip = led->chip;
373 int ret;
374
375 mutex_lock(&chip->lock);
376 ret = lp5521_run_selftest(chip, buf);
377 mutex_unlock(&chip->lock);
378
379 return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
380}
381
382
383static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
384
385static struct attribute *lp5521_attributes[] = {
386 &dev_attr_selftest.attr,
387 NULL
388};
389
390static const struct attribute_group lp5521_group = {
391 .attrs = lp5521_attributes,
392};
393
394
395static struct lp55xx_device_config lp5521_cfg = {
396 .reset = {
397 .addr = LP5521_REG_RESET,
398 .val = LP5521_RESET,
399 },
400 .enable = {
401 .addr = LP5521_REG_ENABLE,
402 .val = LP5521_ENABLE_DEFAULT,
403 },
404 .max_channel = LP5521_MAX_LEDS,
405 .post_init_device = lp5521_post_init_device,
406 .brightness_work_fn = lp5521_led_brightness_work,
407 .set_led_current = lp5521_set_led_current,
408 .firmware_cb = lp5521_firmware_loaded,
409 .run_engine = lp5521_run_engine,
410 .dev_attr_group = &lp5521_group,
411};
412
413static int lp5521_probe(struct i2c_client *client,
414 const struct i2c_device_id *id)
415{
416 int ret;
417 struct lp55xx_chip *chip;
418 struct lp55xx_led *led;
419 struct lp55xx_platform_data *pdata = client->dev.platform_data;
420
421 if (!pdata) {
422 dev_err(&client->dev, "no platform data\n");
423 return -EINVAL;
424 }
425
426 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
427 if (!chip)
428 return -ENOMEM;
429
430 led = devm_kzalloc(&client->dev,
431 sizeof(*led) * pdata->num_channels, GFP_KERNEL);
432 if (!led)
433 return -ENOMEM;
434
435 chip->cl = client;
436 chip->pdata = pdata;
437 chip->cfg = &lp5521_cfg;
438
439 mutex_init(&chip->lock);
440
441 i2c_set_clientdata(client, led);
442
443 ret = lp55xx_init_device(chip);
444 if (ret)
445 goto err_init;
446
447 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
448
449 ret = lp55xx_register_leds(led, chip);
450 if (ret)
451 goto err_register_leds;
452
453 ret = lp55xx_register_sysfs(chip);
454 if (ret) {
455 dev_err(&client->dev, "registering sysfs failed\n");
456 goto err_register_sysfs;
457 }
458
459 return 0;
460
461err_register_sysfs:
462 lp55xx_unregister_leds(led, chip);
463err_register_leds:
464 lp55xx_deinit_device(chip);
465err_init:
466 return ret;
467}
468
469static int lp5521_remove(struct i2c_client *client)
470{
471 struct lp55xx_led *led = i2c_get_clientdata(client);
472 struct lp55xx_chip *chip = led->chip;
473
474 lp5521_stop_engine(chip);
475 lp55xx_unregister_sysfs(chip);
476 lp55xx_unregister_leds(led, chip);
477 lp55xx_deinit_device(chip);
478
479 return 0;
480}
481
482static const struct i2c_device_id lp5521_id[] = {
483 { "lp5521", 0 },
484 { }
485};
486MODULE_DEVICE_TABLE(i2c, lp5521_id);
487
488static struct i2c_driver lp5521_driver = {
489 .driver = {
490 .name = "lp5521",
491 },
492 .probe = lp5521_probe,
493 .remove = lp5521_remove,
494 .id_table = lp5521_id,
495};
496
497module_i2c_driver(lp5521_driver);
498
499MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
500MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
501MODULE_DESCRIPTION("LP5521 LED engine");
502MODULE_LICENSE("GPL v2");
503