This source file includes following definitions.
- lp8501_wait_opmode_done
- lp8501_set_led_current
- lp8501_post_init_device
- lp8501_load_engine
- lp8501_stop_engine
- lp8501_turn_off_channels
- lp8501_run_engine
- lp8501_update_program_memory
- lp8501_firmware_loaded
- lp8501_led_brightness
- lp8501_probe
- lp8501_remove
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10 #include <linux/delay.h>
11 #include <linux/firmware.h>
12 #include <linux/i2c.h>
13 #include <linux/init.h>
14 #include <linux/leds.h>
15 #include <linux/module.h>
16 #include <linux/mutex.h>
17 #include <linux/of.h>
18 #include <linux/platform_data/leds-lp55xx.h>
19 #include <linux/slab.h>
20
21 #include "leds-lp55xx-common.h"
22
23 #define LP8501_PROGRAM_LENGTH 32
24 #define LP8501_MAX_LEDS 9
25
26
27 #define LP8501_REG_ENABLE 0x00
28 #define LP8501_ENABLE BIT(6)
29 #define LP8501_EXEC_M 0x3F
30 #define LP8501_EXEC_ENG1_M 0x30
31 #define LP8501_EXEC_ENG2_M 0x0C
32 #define LP8501_EXEC_ENG3_M 0x03
33 #define LP8501_RUN_ENG1 0x20
34 #define LP8501_RUN_ENG2 0x08
35 #define LP8501_RUN_ENG3 0x02
36
37 #define LP8501_REG_OP_MODE 0x01
38 #define LP8501_MODE_ENG1_M 0x30
39 #define LP8501_MODE_ENG2_M 0x0C
40 #define LP8501_MODE_ENG3_M 0x03
41 #define LP8501_LOAD_ENG1 0x10
42 #define LP8501_LOAD_ENG2 0x04
43 #define LP8501_LOAD_ENG3 0x01
44
45 #define LP8501_REG_PWR_CONFIG 0x05
46 #define LP8501_PWR_CONFIG_M 0x03
47
48 #define LP8501_REG_LED_PWM_BASE 0x16
49
50 #define LP8501_REG_LED_CURRENT_BASE 0x26
51
52 #define LP8501_REG_CONFIG 0x36
53 #define LP8501_PWM_PSAVE BIT(7)
54 #define LP8501_AUTO_INC BIT(6)
55 #define LP8501_PWR_SAVE BIT(5)
56 #define LP8501_CP_AUTO 0x18
57 #define LP8501_INT_CLK BIT(0)
58 #define LP8501_DEFAULT_CFG \
59 (LP8501_PWM_PSAVE | LP8501_AUTO_INC | LP8501_PWR_SAVE | LP8501_CP_AUTO)
60
61 #define LP8501_REG_RESET 0x3D
62 #define LP8501_RESET 0xFF
63
64 #define LP8501_REG_PROG_PAGE_SEL 0x4F
65 #define LP8501_PAGE_ENG1 0
66 #define LP8501_PAGE_ENG2 1
67 #define LP8501_PAGE_ENG3 2
68
69 #define LP8501_REG_PROG_MEM 0x50
70
71 #define LP8501_ENG1_IS_LOADING(mode) \
72 ((mode & LP8501_MODE_ENG1_M) == LP8501_LOAD_ENG1)
73 #define LP8501_ENG2_IS_LOADING(mode) \
74 ((mode & LP8501_MODE_ENG2_M) == LP8501_LOAD_ENG2)
75 #define LP8501_ENG3_IS_LOADING(mode) \
76 ((mode & LP8501_MODE_ENG3_M) == LP8501_LOAD_ENG3)
77
78 static inline void lp8501_wait_opmode_done(void)
79 {
80 usleep_range(1000, 2000);
81 }
82
83 static void lp8501_set_led_current(struct lp55xx_led *led, u8 led_current)
84 {
85 led->led_current = led_current;
86 lp55xx_write(led->chip, LP8501_REG_LED_CURRENT_BASE + led->chan_nr,
87 led_current);
88 }
89
90 static int lp8501_post_init_device(struct lp55xx_chip *chip)
91 {
92 int ret;
93 u8 val = LP8501_DEFAULT_CFG;
94
95 ret = lp55xx_write(chip, LP8501_REG_ENABLE, LP8501_ENABLE);
96 if (ret)
97 return ret;
98
99
100 usleep_range(1000, 2000);
101
102 if (chip->pdata->clock_mode != LP55XX_CLOCK_EXT)
103 val |= LP8501_INT_CLK;
104
105 ret = lp55xx_write(chip, LP8501_REG_CONFIG, val);
106 if (ret)
107 return ret;
108
109
110 return lp55xx_update_bits(chip, LP8501_REG_PWR_CONFIG,
111 LP8501_PWR_CONFIG_M, chip->pdata->pwr_sel);
112 }
113
114 static void lp8501_load_engine(struct lp55xx_chip *chip)
115 {
116 enum lp55xx_engine_index idx = chip->engine_idx;
117 static const u8 mask[] = {
118 [LP55XX_ENGINE_1] = LP8501_MODE_ENG1_M,
119 [LP55XX_ENGINE_2] = LP8501_MODE_ENG2_M,
120 [LP55XX_ENGINE_3] = LP8501_MODE_ENG3_M,
121 };
122
123 static const u8 val[] = {
124 [LP55XX_ENGINE_1] = LP8501_LOAD_ENG1,
125 [LP55XX_ENGINE_2] = LP8501_LOAD_ENG2,
126 [LP55XX_ENGINE_3] = LP8501_LOAD_ENG3,
127 };
128
129 static const u8 page_sel[] = {
130 [LP55XX_ENGINE_1] = LP8501_PAGE_ENG1,
131 [LP55XX_ENGINE_2] = LP8501_PAGE_ENG2,
132 [LP55XX_ENGINE_3] = LP8501_PAGE_ENG3,
133 };
134
135 lp55xx_update_bits(chip, LP8501_REG_OP_MODE, mask[idx], val[idx]);
136
137 lp8501_wait_opmode_done();
138
139 lp55xx_write(chip, LP8501_REG_PROG_PAGE_SEL, page_sel[idx]);
140 }
141
142 static void lp8501_stop_engine(struct lp55xx_chip *chip)
143 {
144 lp55xx_write(chip, LP8501_REG_OP_MODE, 0);
145 lp8501_wait_opmode_done();
146 }
147
148 static void lp8501_turn_off_channels(struct lp55xx_chip *chip)
149 {
150 int i;
151
152 for (i = 0; i < LP8501_MAX_LEDS; i++)
153 lp55xx_write(chip, LP8501_REG_LED_PWM_BASE + i, 0);
154 }
155
156 static void lp8501_run_engine(struct lp55xx_chip *chip, bool start)
157 {
158 int ret;
159 u8 mode;
160 u8 exec;
161
162
163 if (!start) {
164 lp8501_stop_engine(chip);
165 lp8501_turn_off_channels(chip);
166 return;
167 }
168
169
170
171
172
173
174 ret = lp55xx_read(chip, LP8501_REG_OP_MODE, &mode);
175 if (ret)
176 return;
177
178 ret = lp55xx_read(chip, LP8501_REG_ENABLE, &exec);
179 if (ret)
180 return;
181
182
183 if (LP8501_ENG1_IS_LOADING(mode)) {
184 mode = (mode & ~LP8501_MODE_ENG1_M) | LP8501_RUN_ENG1;
185 exec = (exec & ~LP8501_EXEC_ENG1_M) | LP8501_RUN_ENG1;
186 }
187
188 if (LP8501_ENG2_IS_LOADING(mode)) {
189 mode = (mode & ~LP8501_MODE_ENG2_M) | LP8501_RUN_ENG2;
190 exec = (exec & ~LP8501_EXEC_ENG2_M) | LP8501_RUN_ENG2;
191 }
192
193 if (LP8501_ENG3_IS_LOADING(mode)) {
194 mode = (mode & ~LP8501_MODE_ENG3_M) | LP8501_RUN_ENG3;
195 exec = (exec & ~LP8501_EXEC_ENG3_M) | LP8501_RUN_ENG3;
196 }
197
198 lp55xx_write(chip, LP8501_REG_OP_MODE, mode);
199 lp8501_wait_opmode_done();
200
201 lp55xx_update_bits(chip, LP8501_REG_ENABLE, LP8501_EXEC_M, exec);
202 }
203
204 static int lp8501_update_program_memory(struct lp55xx_chip *chip,
205 const u8 *data, size_t size)
206 {
207 u8 pattern[LP8501_PROGRAM_LENGTH] = {0};
208 unsigned cmd;
209 char c[3];
210 int update_size;
211 int nrchars;
212 int offset = 0;
213 int ret;
214 int i;
215
216
217 for (i = 0; i < LP8501_PROGRAM_LENGTH; i++)
218 lp55xx_write(chip, LP8501_REG_PROG_MEM + i, 0);
219
220 i = 0;
221 while ((offset < size - 1) && (i < LP8501_PROGRAM_LENGTH)) {
222
223 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
224 if (ret != 1)
225 goto err;
226
227 ret = sscanf(c, "%2x", &cmd);
228 if (ret != 1)
229 goto err;
230
231 pattern[i] = (u8)cmd;
232 offset += nrchars;
233 i++;
234 }
235
236
237 if (i % 2)
238 goto err;
239
240 update_size = i;
241 for (i = 0; i < update_size; i++)
242 lp55xx_write(chip, LP8501_REG_PROG_MEM + i, pattern[i]);
243
244 return 0;
245
246 err:
247 dev_err(&chip->cl->dev, "wrong pattern format\n");
248 return -EINVAL;
249 }
250
251 static void lp8501_firmware_loaded(struct lp55xx_chip *chip)
252 {
253 const struct firmware *fw = chip->fw;
254
255 if (fw->size > LP8501_PROGRAM_LENGTH) {
256 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
257 fw->size);
258 return;
259 }
260
261
262
263
264
265
266
267 lp8501_load_engine(chip);
268 lp8501_update_program_memory(chip, fw->data, fw->size);
269 }
270
271 static int lp8501_led_brightness(struct lp55xx_led *led)
272 {
273 struct lp55xx_chip *chip = led->chip;
274 int ret;
275
276 mutex_lock(&chip->lock);
277 ret = lp55xx_write(chip, LP8501_REG_LED_PWM_BASE + led->chan_nr,
278 led->brightness);
279 mutex_unlock(&chip->lock);
280
281 return ret;
282 }
283
284
285 static struct lp55xx_device_config lp8501_cfg = {
286 .reset = {
287 .addr = LP8501_REG_RESET,
288 .val = LP8501_RESET,
289 },
290 .enable = {
291 .addr = LP8501_REG_ENABLE,
292 .val = LP8501_ENABLE,
293 },
294 .max_channel = LP8501_MAX_LEDS,
295 .post_init_device = lp8501_post_init_device,
296 .brightness_fn = lp8501_led_brightness,
297 .set_led_current = lp8501_set_led_current,
298 .firmware_cb = lp8501_firmware_loaded,
299 .run_engine = lp8501_run_engine,
300 };
301
302 static int lp8501_probe(struct i2c_client *client,
303 const struct i2c_device_id *id)
304 {
305 int ret;
306 struct lp55xx_chip *chip;
307 struct lp55xx_led *led;
308 struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
309 struct device_node *np = client->dev.of_node;
310
311 if (!pdata) {
312 if (np) {
313 pdata = lp55xx_of_populate_pdata(&client->dev, np);
314 if (IS_ERR(pdata))
315 return PTR_ERR(pdata);
316 } else {
317 dev_err(&client->dev, "no platform data\n");
318 return -EINVAL;
319 }
320 }
321
322 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
323 if (!chip)
324 return -ENOMEM;
325
326 led = devm_kcalloc(&client->dev,
327 pdata->num_channels, sizeof(*led), GFP_KERNEL);
328 if (!led)
329 return -ENOMEM;
330
331 chip->cl = client;
332 chip->pdata = pdata;
333 chip->cfg = &lp8501_cfg;
334
335 mutex_init(&chip->lock);
336
337 i2c_set_clientdata(client, led);
338
339 ret = lp55xx_init_device(chip);
340 if (ret)
341 goto err_init;
342
343 dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
344
345 ret = lp55xx_register_leds(led, chip);
346 if (ret)
347 goto err_register_leds;
348
349 ret = lp55xx_register_sysfs(chip);
350 if (ret) {
351 dev_err(&client->dev, "registering sysfs failed\n");
352 goto err_register_sysfs;
353 }
354
355 return 0;
356
357 err_register_sysfs:
358 lp55xx_unregister_leds(led, chip);
359 err_register_leds:
360 lp55xx_deinit_device(chip);
361 err_init:
362 return ret;
363 }
364
365 static int lp8501_remove(struct i2c_client *client)
366 {
367 struct lp55xx_led *led = i2c_get_clientdata(client);
368 struct lp55xx_chip *chip = led->chip;
369
370 lp8501_stop_engine(chip);
371 lp55xx_unregister_sysfs(chip);
372 lp55xx_unregister_leds(led, chip);
373 lp55xx_deinit_device(chip);
374
375 return 0;
376 }
377
378 static const struct i2c_device_id lp8501_id[] = {
379 { "lp8501", 0 },
380 { }
381 };
382 MODULE_DEVICE_TABLE(i2c, lp8501_id);
383
384 #ifdef CONFIG_OF
385 static const struct of_device_id of_lp8501_leds_match[] = {
386 { .compatible = "ti,lp8501", },
387 {},
388 };
389
390 MODULE_DEVICE_TABLE(of, of_lp8501_leds_match);
391 #endif
392
393 static struct i2c_driver lp8501_driver = {
394 .driver = {
395 .name = "lp8501",
396 .of_match_table = of_match_ptr(of_lp8501_leds_match),
397 },
398 .probe = lp8501_probe,
399 .remove = lp8501_remove,
400 .id_table = lp8501_id,
401 };
402
403 module_i2c_driver(lp8501_driver);
404
405 MODULE_DESCRIPTION("Texas Instruments LP8501 LED driver");
406 MODULE_AUTHOR("Milo Kim");
407 MODULE_LICENSE("GPL");