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staging: most: core: add a match function for the bus
[linux/fpc-iii.git] / drivers / regulator / lp872x.c
blob38992112fd6e2c3838fc95ab49a261abc6eab5bf
1 /*
2 * Copyright 2012 Texas Instruments
3 *
4 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
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 version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/i2c.h>
15 #include <linux/regmap.h>
16 #include <linux/err.h>
17 #include <linux/gpio.h>
18 #include <linux/delay.h>
19 #include <linux/regulator/lp872x.h>
20 #include <linux/regulator/driver.h>
21 #include <linux/platform_device.h>
22 #include <linux/of.h>
23 #include <linux/of_gpio.h>
24 #include <linux/regulator/of_regulator.h>
25
26 /* Registers : LP8720/8725 shared */
27 #define LP872X_GENERAL_CFG 0x00
28 #define LP872X_LDO1_VOUT 0x01
29 #define LP872X_LDO2_VOUT 0x02
30 #define LP872X_LDO3_VOUT 0x03
31 #define LP872X_LDO4_VOUT 0x04
32 #define LP872X_LDO5_VOUT 0x05
33
34 /* Registers : LP8720 */
35 #define LP8720_BUCK_VOUT1 0x06
36 #define LP8720_BUCK_VOUT2 0x07
37 #define LP8720_ENABLE 0x08
38
39 /* Registers : LP8725 */
40 #define LP8725_LILO1_VOUT 0x06
41 #define LP8725_LILO2_VOUT 0x07
42 #define LP8725_BUCK1_VOUT1 0x08
43 #define LP8725_BUCK1_VOUT2 0x09
44 #define LP8725_BUCK2_VOUT1 0x0A
45 #define LP8725_BUCK2_VOUT2 0x0B
46 #define LP8725_BUCK_CTRL 0x0C
47 #define LP8725_LDO_CTRL 0x0D
48
49 /* Mask/shift : LP8720/LP8725 shared */
50 #define LP872X_VOUT_M 0x1F
51 #define LP872X_START_DELAY_M 0xE0
52 #define LP872X_START_DELAY_S 5
53 #define LP872X_EN_LDO1_M BIT(0)
54 #define LP872X_EN_LDO2_M BIT(1)
55 #define LP872X_EN_LDO3_M BIT(2)
56 #define LP872X_EN_LDO4_M BIT(3)
57 #define LP872X_EN_LDO5_M BIT(4)
58
59 /* Mask/shift : LP8720 */
60 #define LP8720_TIMESTEP_S 0 /* Addr 00h */
61 #define LP8720_TIMESTEP_M BIT(0)
62 #define LP8720_EXT_DVS_M BIT(2)
63 #define LP8720_BUCK_FPWM_S 5 /* Addr 07h */
64 #define LP8720_BUCK_FPWM_M BIT(5)
65 #define LP8720_EN_BUCK_M BIT(5) /* Addr 08h */
66 #define LP8720_DVS_SEL_M BIT(7)
67
68 /* Mask/shift : LP8725 */
69 #define LP8725_TIMESTEP_M 0xC0 /* Addr 00h */
70 #define LP8725_TIMESTEP_S 6
71 #define LP8725_BUCK1_EN_M BIT(0)
72 #define LP8725_DVS1_M BIT(2)
73 #define LP8725_DVS2_M BIT(3)
74 #define LP8725_BUCK2_EN_M BIT(4)
75 #define LP8725_BUCK_CL_M 0xC0 /* Addr 09h, 0Bh */
76 #define LP8725_BUCK_CL_S 6
77 #define LP8725_BUCK1_FPWM_S 1 /* Addr 0Ch */
78 #define LP8725_BUCK1_FPWM_M BIT(1)
79 #define LP8725_BUCK2_FPWM_S 5
80 #define LP8725_BUCK2_FPWM_M BIT(5)
81 #define LP8725_EN_LILO1_M BIT(5) /* Addr 0Dh */
82 #define LP8725_EN_LILO2_M BIT(6)
83
84 /* PWM mode */
85 #define LP872X_FORCE_PWM 1
86 #define LP872X_AUTO_PWM 0
87
88 #define LP8720_NUM_REGULATORS 6
89 #define LP8725_NUM_REGULATORS 9
90 #define EXTERN_DVS_USED 0
91 #define MAX_DELAY 6
92
93 /* Default DVS Mode */
94 #define LP8720_DEFAULT_DVS 0
95 #define LP8725_DEFAULT_DVS BIT(2)
96
97 /* dump registers in regmap-debugfs */
98 #define MAX_REGISTERS 0x0F
99
100 enum lp872x_id {
101 LP8720,
102 LP8725,
103 };
104
105 struct lp872x {
106 struct regmap *regmap;
107 struct device *dev;
108 enum lp872x_id chipid;
109 struct lp872x_platform_data *pdata;
110 int num_regulators;
111 enum lp872x_dvs_state dvs_pin;
112 };
113
114 /* LP8720/LP8725 shared voltage table for LDOs */
115 static const unsigned int lp872x_ldo_vtbl[] = {
116 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000, 1550000,
117 1600000, 1650000, 1700000, 1750000, 1800000, 1850000, 1900000, 2000000,
118 2100000, 2200000, 2300000, 2400000, 2500000, 2600000, 2650000, 2700000,
119 2750000, 2800000, 2850000, 2900000, 2950000, 3000000, 3100000, 3300000,
120 };
121
122 /* LP8720 LDO4 voltage table */
123 static const unsigned int lp8720_ldo4_vtbl[] = {
124 800000, 850000, 900000, 1000000, 1100000, 1200000, 1250000, 1300000,
125 1350000, 1400000, 1450000, 1500000, 1550000, 1600000, 1650000, 1700000,
126 1750000, 1800000, 1850000, 1900000, 2000000, 2100000, 2200000, 2300000,
127 2400000, 2500000, 2600000, 2650000, 2700000, 2750000, 2800000, 2850000,
128 };
129
130 /* LP8725 LILO(Low Input Low Output) voltage table */
131 static const unsigned int lp8725_lilo_vtbl[] = {
132 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000, 1150000,
133 1200000, 1250000, 1300000, 1350000, 1400000, 1500000, 1600000, 1700000,
134 1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
135 2600000, 2700000, 2800000, 2850000, 2900000, 3000000, 3100000, 3300000,
136 };
137
138 /* LP8720 BUCK voltage table */
139 #define EXT_R 0 /* external resistor divider */
140 static const unsigned int lp8720_buck_vtbl[] = {
141 EXT_R, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000,
142 1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
143 1550000, 1600000, 1650000, 1700000, 1750000, 1800000, 1850000, 1900000,
144 1950000, 2000000, 2050000, 2100000, 2150000, 2200000, 2250000, 2300000,
145 };
146
147 /* LP8725 BUCK voltage table */
148 static const unsigned int lp8725_buck_vtbl[] = {
149 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000, 1150000,
150 1200000, 1250000, 1300000, 1350000, 1400000, 1500000, 1600000, 1700000,
151 1750000, 1800000, 1850000, 1900000, 2000000, 2100000, 2200000, 2300000,
152 2400000, 2500000, 2600000, 2700000, 2800000, 2850000, 2900000, 3000000,
153 };
154
155 /* LP8725 BUCK current limit */
156 static const unsigned int lp8725_buck_uA[] = {
157 460000, 780000, 1050000, 1370000,
158 };
159
160 static int lp872x_read_byte(struct lp872x *lp, u8 addr, u8 *data)
161 {
162 int ret;
163 unsigned int val;
164
165 ret = regmap_read(lp->regmap, addr, &val);
166 if (ret < 0) {
167 dev_err(lp->dev, "failed to read 0x%.2x\n", addr);
168 return ret;
169 }
170
171 *data = (u8)val;
172 return 0;
173 }
174
175 static inline int lp872x_write_byte(struct lp872x *lp, u8 addr, u8 data)
176 {
177 return regmap_write(lp->regmap, addr, data);
178 }
179
180 static inline int lp872x_update_bits(struct lp872x *lp, u8 addr,
181 unsigned int mask, u8 data)
182 {
183 return regmap_update_bits(lp->regmap, addr, mask, data);
184 }
185
186 static int lp872x_get_timestep_usec(struct lp872x *lp)
187 {
188 enum lp872x_id chip = lp->chipid;
189 u8 val, mask, shift;
190 int *time_usec, size, ret;
191 int lp8720_time_usec[] = { 25, 50 };
192 int lp8725_time_usec[] = { 32, 64, 128, 256 };
193
194 switch (chip) {
195 case LP8720:
196 mask = LP8720_TIMESTEP_M;
197 shift = LP8720_TIMESTEP_S;
198 time_usec = &lp8720_time_usec[0];
199 size = ARRAY_SIZE(lp8720_time_usec);
200 break;
201 case LP8725:
202 mask = LP8725_TIMESTEP_M;
203 shift = LP8725_TIMESTEP_S;
204 time_usec = &lp8725_time_usec[0];
205 size = ARRAY_SIZE(lp8725_time_usec);
206 break;
207 default:
208 return -EINVAL;
209 }
210
211 ret = lp872x_read_byte(lp, LP872X_GENERAL_CFG, &val);
212 if (ret)
213 return ret;
214
215 val = (val & mask) >> shift;
216 if (val >= size)
217 return -EINVAL;
218
219 return *(time_usec + val);
220 }
221
222 static int lp872x_regulator_enable_time(struct regulator_dev *rdev)
223 {
224 struct lp872x *lp = rdev_get_drvdata(rdev);
225 enum lp872x_regulator_id rid = rdev_get_id(rdev);
226 int time_step_us = lp872x_get_timestep_usec(lp);
227 int ret;
228 u8 addr, val;
229
230 if (time_step_us < 0)
231 return time_step_us;
232
233 switch (rid) {
234 case LP8720_ID_LDO1 ... LP8720_ID_BUCK:
235 addr = LP872X_LDO1_VOUT + rid;
236 break;
237 case LP8725_ID_LDO1 ... LP8725_ID_BUCK1:
238 addr = LP872X_LDO1_VOUT + rid - LP8725_ID_BASE;
239 break;
240 case LP8725_ID_BUCK2:
241 addr = LP8725_BUCK2_VOUT1;
242 break;
243 default:
244 return -EINVAL;
245 }
246
247 ret = lp872x_read_byte(lp, addr, &val);
248 if (ret)
249 return ret;
250
251 val = (val & LP872X_START_DELAY_M) >> LP872X_START_DELAY_S;
252
253 return val > MAX_DELAY ? 0 : val * time_step_us;
254 }
255
256 static void lp872x_set_dvs(struct lp872x *lp, enum lp872x_dvs_sel dvs_sel,
257 int gpio)
258 {
259 enum lp872x_dvs_state state;
260
261 state = dvs_sel == SEL_V1 ? DVS_HIGH : DVS_LOW;
262 gpio_set_value(gpio, state);
263 lp->dvs_pin = state;
264 }
265
266 static u8 lp872x_select_buck_vout_addr(struct lp872x *lp,
267 enum lp872x_regulator_id buck)
268 {
269 u8 val, addr;
270
271 if (lp872x_read_byte(lp, LP872X_GENERAL_CFG, &val))
272 return 0;
273
274 switch (buck) {
275 case LP8720_ID_BUCK:
276 if (val & LP8720_EXT_DVS_M) {
277 addr = (lp->dvs_pin == DVS_HIGH) ?
278 LP8720_BUCK_VOUT1 : LP8720_BUCK_VOUT2;
279 } else {
280 if (lp872x_read_byte(lp, LP8720_ENABLE, &val))
281 return 0;
282
283 addr = val & LP8720_DVS_SEL_M ?
284 LP8720_BUCK_VOUT1 : LP8720_BUCK_VOUT2;
285 }
286 break;
287 case LP8725_ID_BUCK1:
288 if (val & LP8725_DVS1_M)
289 addr = LP8725_BUCK1_VOUT1;
290 else
291 addr = (lp->dvs_pin == DVS_HIGH) ?
292 LP8725_BUCK1_VOUT1 : LP8725_BUCK1_VOUT2;
293 break;
294 case LP8725_ID_BUCK2:
295 addr = val & LP8725_DVS2_M ?
296 LP8725_BUCK2_VOUT1 : LP8725_BUCK2_VOUT2;
297 break;
298 default:
299 return 0;
300 }
301
302 return addr;
303 }
304
305 static bool lp872x_is_valid_buck_addr(u8 addr)
306 {
307 switch (addr) {
308 case LP8720_BUCK_VOUT1:
309 case LP8720_BUCK_VOUT2:
310 case LP8725_BUCK1_VOUT1:
311 case LP8725_BUCK1_VOUT2:
312 case LP8725_BUCK2_VOUT1:
313 case LP8725_BUCK2_VOUT2:
314 return true;
315 default:
316 return false;
317 }
318 }
319
320 static int lp872x_buck_set_voltage_sel(struct regulator_dev *rdev,
321 unsigned selector)
322 {
323 struct lp872x *lp = rdev_get_drvdata(rdev);
324 enum lp872x_regulator_id buck = rdev_get_id(rdev);
325 u8 addr, mask = LP872X_VOUT_M;
326 struct lp872x_dvs *dvs = lp->pdata ? lp->pdata->dvs : NULL;
327
328 if (dvs && gpio_is_valid(dvs->gpio))
329 lp872x_set_dvs(lp, dvs->vsel, dvs->gpio);
330
331 addr = lp872x_select_buck_vout_addr(lp, buck);
332 if (!lp872x_is_valid_buck_addr(addr))
333 return -EINVAL;
334
335 return lp872x_update_bits(lp, addr, mask, selector);
336 }
337
338 static int lp872x_buck_get_voltage_sel(struct regulator_dev *rdev)
339 {
340 struct lp872x *lp = rdev_get_drvdata(rdev);
341 enum lp872x_regulator_id buck = rdev_get_id(rdev);
342 u8 addr, val;
343 int ret;
344
345 addr = lp872x_select_buck_vout_addr(lp, buck);
346 if (!lp872x_is_valid_buck_addr(addr))
347 return -EINVAL;
348
349 ret = lp872x_read_byte(lp, addr, &val);
350 if (ret)
351 return ret;
352
353 return val & LP872X_VOUT_M;
354 }
355
356 static int lp8725_buck_set_current_limit(struct regulator_dev *rdev,
357 int min_uA, int max_uA)
358 {
359 struct lp872x *lp = rdev_get_drvdata(rdev);
360 enum lp872x_regulator_id buck = rdev_get_id(rdev);
361 int i;
362 u8 addr;
363
364 switch (buck) {
365 case LP8725_ID_BUCK1:
366 addr = LP8725_BUCK1_VOUT2;
367 break;
368 case LP8725_ID_BUCK2:
369 addr = LP8725_BUCK2_VOUT2;
370 break;
371 default:
372 return -EINVAL;
373 }
374
375 for (i = ARRAY_SIZE(lp8725_buck_uA) - 1; i >= 0; i--) {
376 if (lp8725_buck_uA[i] >= min_uA &&
377 lp8725_buck_uA[i] <= max_uA)
378 return lp872x_update_bits(lp, addr,
379 LP8725_BUCK_CL_M,
380 i << LP8725_BUCK_CL_S);
381 }
382
383 return -EINVAL;
384 }
385
386 static int lp8725_buck_get_current_limit(struct regulator_dev *rdev)
387 {
388 struct lp872x *lp = rdev_get_drvdata(rdev);
389 enum lp872x_regulator_id buck = rdev_get_id(rdev);
390 u8 addr, val;
391 int ret;
392
393 switch (buck) {
394 case LP8725_ID_BUCK1:
395 addr = LP8725_BUCK1_VOUT2;
396 break;
397 case LP8725_ID_BUCK2:
398 addr = LP8725_BUCK2_VOUT2;
399 break;
400 default:
401 return -EINVAL;
402 }
403
404 ret = lp872x_read_byte(lp, addr, &val);
405 if (ret)
406 return ret;
407
408 val = (val & LP8725_BUCK_CL_M) >> LP8725_BUCK_CL_S;
409
410 return (val < ARRAY_SIZE(lp8725_buck_uA)) ?
411 lp8725_buck_uA[val] : -EINVAL;
412 }
413
414 static int lp872x_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
415 {
416 struct lp872x *lp = rdev_get_drvdata(rdev);
417 enum lp872x_regulator_id buck = rdev_get_id(rdev);
418 u8 addr, mask, shift, val;
419
420 switch (buck) {
421 case LP8720_ID_BUCK:
422 addr = LP8720_BUCK_VOUT2;
423 mask = LP8720_BUCK_FPWM_M;
424 shift = LP8720_BUCK_FPWM_S;
425 break;
426 case LP8725_ID_BUCK1:
427 addr = LP8725_BUCK_CTRL;
428 mask = LP8725_BUCK1_FPWM_M;
429 shift = LP8725_BUCK1_FPWM_S;
430 break;
431 case LP8725_ID_BUCK2:
432 addr = LP8725_BUCK_CTRL;
433 mask = LP8725_BUCK2_FPWM_M;
434 shift = LP8725_BUCK2_FPWM_S;
435 break;
436 default:
437 return -EINVAL;
438 }
439
440 if (mode == REGULATOR_MODE_FAST)
441 val = LP872X_FORCE_PWM << shift;
442 else if (mode == REGULATOR_MODE_NORMAL)
443 val = LP872X_AUTO_PWM << shift;
444 else
445 return -EINVAL;
446
447 return lp872x_update_bits(lp, addr, mask, val);
448 }
449
450 static unsigned int lp872x_buck_get_mode(struct regulator_dev *rdev)
451 {
452 struct lp872x *lp = rdev_get_drvdata(rdev);
453 enum lp872x_regulator_id buck = rdev_get_id(rdev);
454 u8 addr, mask, val;
455 int ret;
456
457 switch (buck) {
458 case LP8720_ID_BUCK:
459 addr = LP8720_BUCK_VOUT2;
460 mask = LP8720_BUCK_FPWM_M;
461 break;
462 case LP8725_ID_BUCK1:
463 addr = LP8725_BUCK_CTRL;
464 mask = LP8725_BUCK1_FPWM_M;
465 break;
466 case LP8725_ID_BUCK2:
467 addr = LP8725_BUCK_CTRL;
468 mask = LP8725_BUCK2_FPWM_M;
469 break;
470 default:
471 return -EINVAL;
472 }
473
474 ret = lp872x_read_byte(lp, addr, &val);
475 if (ret)
476 return ret;
477
478 return val & mask ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
479 }
480
481 static struct regulator_ops lp872x_ldo_ops = {
482 .list_voltage = regulator_list_voltage_table,
483 .map_voltage = regulator_map_voltage_ascend,
484 .set_voltage_sel = regulator_set_voltage_sel_regmap,
485 .get_voltage_sel = regulator_get_voltage_sel_regmap,
486 .enable = regulator_enable_regmap,
487 .disable = regulator_disable_regmap,
488 .is_enabled = regulator_is_enabled_regmap,
489 .enable_time = lp872x_regulator_enable_time,
490 };
491
492 static struct regulator_ops lp8720_buck_ops = {
493 .list_voltage = regulator_list_voltage_table,
494 .map_voltage = regulator_map_voltage_ascend,
495 .set_voltage_sel = lp872x_buck_set_voltage_sel,
496 .get_voltage_sel = lp872x_buck_get_voltage_sel,
497 .enable = regulator_enable_regmap,
498 .disable = regulator_disable_regmap,
499 .is_enabled = regulator_is_enabled_regmap,
500 .enable_time = lp872x_regulator_enable_time,
501 .set_mode = lp872x_buck_set_mode,
502 .get_mode = lp872x_buck_get_mode,
503 };
504
505 static struct regulator_ops lp8725_buck_ops = {
506 .list_voltage = regulator_list_voltage_table,
507 .map_voltage = regulator_map_voltage_ascend,
508 .set_voltage_sel = lp872x_buck_set_voltage_sel,
509 .get_voltage_sel = lp872x_buck_get_voltage_sel,
510 .enable = regulator_enable_regmap,
511 .disable = regulator_disable_regmap,
512 .is_enabled = regulator_is_enabled_regmap,
513 .enable_time = lp872x_regulator_enable_time,
514 .set_mode = lp872x_buck_set_mode,
515 .get_mode = lp872x_buck_get_mode,
516 .set_current_limit = lp8725_buck_set_current_limit,
517 .get_current_limit = lp8725_buck_get_current_limit,
518 };
519
520 static struct regulator_desc lp8720_regulator_desc[] = {
521 {
522 .name = "ldo1",
523 .of_match = of_match_ptr("ldo1"),
524 .id = LP8720_ID_LDO1,
525 .ops = &lp872x_ldo_ops,
526 .n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
527 .volt_table = lp872x_ldo_vtbl,
528 .type = REGULATOR_VOLTAGE,
529 .owner = THIS_MODULE,
530 .vsel_reg = LP872X_LDO1_VOUT,
531 .vsel_mask = LP872X_VOUT_M,
532 .enable_reg = LP8720_ENABLE,
533 .enable_mask = LP872X_EN_LDO1_M,
534 },
535 {
536 .name = "ldo2",
537 .of_match = of_match_ptr("ldo2"),
538 .id = LP8720_ID_LDO2,
539 .ops = &lp872x_ldo_ops,
540 .n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
541 .volt_table = lp872x_ldo_vtbl,
542 .type = REGULATOR_VOLTAGE,
543 .owner = THIS_MODULE,
544 .vsel_reg = LP872X_LDO2_VOUT,
545 .vsel_mask = LP872X_VOUT_M,
546 .enable_reg = LP8720_ENABLE,
547 .enable_mask = LP872X_EN_LDO2_M,
548 },
549 {
550 .name = "ldo3",
551 .of_match = of_match_ptr("ldo3"),
552 .id = LP8720_ID_LDO3,
553 .ops = &lp872x_ldo_ops,
554 .n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
555 .volt_table = lp872x_ldo_vtbl,
556 .type = REGULATOR_VOLTAGE,
557 .owner = THIS_MODULE,
558 .vsel_reg = LP872X_LDO3_VOUT,
559 .vsel_mask = LP872X_VOUT_M,
560 .enable_reg = LP8720_ENABLE,
561 .enable_mask = LP872X_EN_LDO3_M,
562 },
563 {
564 .name = "ldo4",
565 .of_match = of_match_ptr("ldo4"),
566 .id = LP8720_ID_LDO4,
567 .ops = &lp872x_ldo_ops,
568 .n_voltages = ARRAY_SIZE(lp8720_ldo4_vtbl),
569 .volt_table = lp8720_ldo4_vtbl,
570 .type = REGULATOR_VOLTAGE,
571 .owner = THIS_MODULE,
572 .vsel_reg = LP872X_LDO4_VOUT,
573 .vsel_mask = LP872X_VOUT_M,
574 .enable_reg = LP8720_ENABLE,
575 .enable_mask = LP872X_EN_LDO4_M,
576 },
577 {
578 .name = "ldo5",
579 .of_match = of_match_ptr("ldo5"),
580 .id = LP8720_ID_LDO5,
581 .ops = &lp872x_ldo_ops,
582 .n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
583 .volt_table = lp872x_ldo_vtbl,
584 .type = REGULATOR_VOLTAGE,
585 .owner = THIS_MODULE,
586 .vsel_reg = LP872X_LDO5_VOUT,
587 .vsel_mask = LP872X_VOUT_M,
588 .enable_reg = LP8720_ENABLE,
589 .enable_mask = LP872X_EN_LDO5_M,
590 },
591 {
592 .name = "buck",
593 .of_match = of_match_ptr("buck"),
594 .id = LP8720_ID_BUCK,
595 .ops = &lp8720_buck_ops,
596 .n_voltages = ARRAY_SIZE(lp8720_buck_vtbl),
597 .volt_table = lp8720_buck_vtbl,
598 .type = REGULATOR_VOLTAGE,
599 .owner = THIS_MODULE,
600 .enable_reg = LP8720_ENABLE,
601 .enable_mask = LP8720_EN_BUCK_M,
602 },
603 };
604
605 static struct regulator_desc lp8725_regulator_desc[] = {
606 {
607 .name = "ldo1",
608 .of_match = of_match_ptr("ldo1"),
609 .id = LP8725_ID_LDO1,
610 .ops = &lp872x_ldo_ops,
611 .n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
612 .volt_table = lp872x_ldo_vtbl,
613 .type = REGULATOR_VOLTAGE,
614 .owner = THIS_MODULE,
615 .vsel_reg = LP872X_LDO1_VOUT,
616 .vsel_mask = LP872X_VOUT_M,
617 .enable_reg = LP8725_LDO_CTRL,
618 .enable_mask = LP872X_EN_LDO1_M,
619 },
620 {
621 .name = "ldo2",
622 .of_match = of_match_ptr("ldo2"),
623 .id = LP8725_ID_LDO2,
624 .ops = &lp872x_ldo_ops,
625 .n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
626 .volt_table = lp872x_ldo_vtbl,
627 .type = REGULATOR_VOLTAGE,
628 .owner = THIS_MODULE,
629 .vsel_reg = LP872X_LDO2_VOUT,
630 .vsel_mask = LP872X_VOUT_M,
631 .enable_reg = LP8725_LDO_CTRL,
632 .enable_mask = LP872X_EN_LDO2_M,
633 },
634 {
635 .name = "ldo3",
636 .of_match = of_match_ptr("ldo3"),
637 .id = LP8725_ID_LDO3,
638 .ops = &lp872x_ldo_ops,
639 .n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
640 .volt_table = lp872x_ldo_vtbl,
641 .type = REGULATOR_VOLTAGE,
642 .owner = THIS_MODULE,
643 .vsel_reg = LP872X_LDO3_VOUT,
644 .vsel_mask = LP872X_VOUT_M,
645 .enable_reg = LP8725_LDO_CTRL,
646 .enable_mask = LP872X_EN_LDO3_M,
647 },
648 {
649 .name = "ldo4",
650 .of_match = of_match_ptr("ldo4"),
651 .id = LP8725_ID_LDO4,
652 .ops = &lp872x_ldo_ops,
653 .n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
654 .volt_table = lp872x_ldo_vtbl,
655 .type = REGULATOR_VOLTAGE,
656 .owner = THIS_MODULE,
657 .vsel_reg = LP872X_LDO4_VOUT,
658 .vsel_mask = LP872X_VOUT_M,
659 .enable_reg = LP8725_LDO_CTRL,
660 .enable_mask = LP872X_EN_LDO4_M,
661 },
662 {
663 .name = "ldo5",
664 .of_match = of_match_ptr("ldo5"),
665 .id = LP8725_ID_LDO5,
666 .ops = &lp872x_ldo_ops,
667 .n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
668 .volt_table = lp872x_ldo_vtbl,
669 .type = REGULATOR_VOLTAGE,
670 .owner = THIS_MODULE,
671 .vsel_reg = LP872X_LDO5_VOUT,
672 .vsel_mask = LP872X_VOUT_M,
673 .enable_reg = LP8725_LDO_CTRL,
674 .enable_mask = LP872X_EN_LDO5_M,
675 },
676 {
677 .name = "lilo1",
678 .of_match = of_match_ptr("lilo1"),
679 .id = LP8725_ID_LILO1,
680 .ops = &lp872x_ldo_ops,
681 .n_voltages = ARRAY_SIZE(lp8725_lilo_vtbl),
682 .volt_table = lp8725_lilo_vtbl,
683 .type = REGULATOR_VOLTAGE,
684 .owner = THIS_MODULE,
685 .vsel_reg = LP8725_LILO1_VOUT,
686 .vsel_mask = LP872X_VOUT_M,
687 .enable_reg = LP8725_LDO_CTRL,
688 .enable_mask = LP8725_EN_LILO1_M,
689 },
690 {
691 .name = "lilo2",
692 .of_match = of_match_ptr("lilo2"),
693 .id = LP8725_ID_LILO2,
694 .ops = &lp872x_ldo_ops,
695 .n_voltages = ARRAY_SIZE(lp8725_lilo_vtbl),
696 .volt_table = lp8725_lilo_vtbl,
697 .type = REGULATOR_VOLTAGE,
698 .owner = THIS_MODULE,
699 .vsel_reg = LP8725_LILO2_VOUT,
700 .vsel_mask = LP872X_VOUT_M,
701 .enable_reg = LP8725_LDO_CTRL,
702 .enable_mask = LP8725_EN_LILO2_M,
703 },
704 {
705 .name = "buck1",
706 .of_match = of_match_ptr("buck1"),
707 .id = LP8725_ID_BUCK1,
708 .ops = &lp8725_buck_ops,
709 .n_voltages = ARRAY_SIZE(lp8725_buck_vtbl),
710 .volt_table = lp8725_buck_vtbl,
711 .type = REGULATOR_VOLTAGE,
712 .owner = THIS_MODULE,
713 .enable_reg = LP872X_GENERAL_CFG,
714 .enable_mask = LP8725_BUCK1_EN_M,
715 },
716 {
717 .name = "buck2",
718 .of_match = of_match_ptr("buck2"),
719 .id = LP8725_ID_BUCK2,
720 .ops = &lp8725_buck_ops,
721 .n_voltages = ARRAY_SIZE(lp8725_buck_vtbl),
722 .volt_table = lp8725_buck_vtbl,
723 .type = REGULATOR_VOLTAGE,
724 .owner = THIS_MODULE,
725 .enable_reg = LP872X_GENERAL_CFG,
726 .enable_mask = LP8725_BUCK2_EN_M,
727 },
728 };
729
730 static int lp872x_init_dvs(struct lp872x *lp)
731 {
732 int ret, gpio;
733 struct lp872x_dvs *dvs = lp->pdata ? lp->pdata->dvs : NULL;
734 enum lp872x_dvs_state pinstate;
735 u8 mask[] = { LP8720_EXT_DVS_M, LP8725_DVS1_M | LP8725_DVS2_M };
736 u8 default_dvs_mode[] = { LP8720_DEFAULT_DVS, LP8725_DEFAULT_DVS };
737
738 if (!dvs)
739 goto set_default_dvs_mode;
740
741 gpio = dvs->gpio;
742 if (!gpio_is_valid(gpio))
743 goto set_default_dvs_mode;
744
745 pinstate = dvs->init_state;
746 ret = devm_gpio_request_one(lp->dev, gpio, pinstate, "LP872X DVS");
747 if (ret) {
748 dev_err(lp->dev, "gpio request err: %d\n", ret);
749 return ret;
750 }
751
752 lp->dvs_pin = pinstate;
753
754 return 0;
755
756 set_default_dvs_mode:
757 return lp872x_update_bits(lp, LP872X_GENERAL_CFG, mask[lp->chipid],
758 default_dvs_mode[lp->chipid]);
759 }
760
761 static int lp872x_hw_enable(struct lp872x *lp)
762 {
763 int ret, gpio;
764
765 if (!lp->pdata)
766 return -EINVAL;
767
768 gpio = lp->pdata->enable_gpio;
769 if (!gpio_is_valid(gpio))
770 return 0;
771
772 /* Always set enable GPIO high. */
773 ret = devm_gpio_request_one(lp->dev, gpio, GPIOF_OUT_INIT_HIGH, "LP872X EN");
774 if (ret) {
775 dev_err(lp->dev, "gpio request err: %d\n", ret);
776 return ret;
777 }
778
779 /* Each chip has a different enable delay. */
780 if (lp->chipid == LP8720)
781 usleep_range(LP8720_ENABLE_DELAY, 1.5 * LP8720_ENABLE_DELAY);
782 else
783 usleep_range(LP8725_ENABLE_DELAY, 1.5 * LP8725_ENABLE_DELAY);
784
785 return 0;
786 }
787
788 static int lp872x_config(struct lp872x *lp)
789 {
790 struct lp872x_platform_data *pdata = lp->pdata;
791 int ret;
792
793 if (!pdata || !pdata->update_config)
794 goto init_dvs;
795
796 ret = lp872x_write_byte(lp, LP872X_GENERAL_CFG, pdata->general_config);
797 if (ret)
798 return ret;
799
800 init_dvs:
801 return lp872x_init_dvs(lp);
802 }
803
804 static struct regulator_init_data
805 *lp872x_find_regulator_init_data(int id, struct lp872x *lp)
806 {
807 struct lp872x_platform_data *pdata = lp->pdata;
808 int i;
809
810 if (!pdata)
811 return NULL;
812
813 for (i = 0; i < lp->num_regulators; i++) {
814 if (pdata->regulator_data[i].id == id)
815 return pdata->regulator_data[i].init_data;
816 }
817
818 return NULL;
819 }
820
821 static int lp872x_regulator_register(struct lp872x *lp)
822 {
823 struct regulator_desc *desc;
824 struct regulator_config cfg = { };
825 struct regulator_dev *rdev;
826 int i;
827
828 for (i = 0; i < lp->num_regulators; i++) {
829 desc = (lp->chipid == LP8720) ? &lp8720_regulator_desc[i] :
830 &lp8725_regulator_desc[i];
831
832 cfg.dev = lp->dev;
833 cfg.init_data = lp872x_find_regulator_init_data(desc->id, lp);
834 cfg.driver_data = lp;
835 cfg.regmap = lp->regmap;
836
837 rdev = devm_regulator_register(lp->dev, desc, &cfg);
838 if (IS_ERR(rdev)) {
839 dev_err(lp->dev, "regulator register err");
840 return PTR_ERR(rdev);
841 }
842 }
843
844 return 0;
845 }
846
847 static const struct regmap_config lp872x_regmap_config = {
848 .reg_bits = 8,
849 .val_bits = 8,
850 .max_register = MAX_REGISTERS,
851 };
852
853 #ifdef CONFIG_OF
854
855 #define LP872X_VALID_OPMODE (REGULATOR_MODE_FAST | REGULATOR_MODE_NORMAL)
856
857 static struct of_regulator_match lp8720_matches[] = {
858 { .name = "ldo1", .driver_data = (void *)LP8720_ID_LDO1, },
859 { .name = "ldo2", .driver_data = (void *)LP8720_ID_LDO2, },
860 { .name = "ldo3", .driver_data = (void *)LP8720_ID_LDO3, },
861 { .name = "ldo4", .driver_data = (void *)LP8720_ID_LDO4, },
862 { .name = "ldo5", .driver_data = (void *)LP8720_ID_LDO5, },
863 { .name = "buck", .driver_data = (void *)LP8720_ID_BUCK, },
864 };
865
866 static struct of_regulator_match lp8725_matches[] = {
867 { .name = "ldo1", .driver_data = (void *)LP8725_ID_LDO1, },
868 { .name = "ldo2", .driver_data = (void *)LP8725_ID_LDO2, },
869 { .name = "ldo3", .driver_data = (void *)LP8725_ID_LDO3, },
870 { .name = "ldo4", .driver_data = (void *)LP8725_ID_LDO4, },
871 { .name = "ldo5", .driver_data = (void *)LP8725_ID_LDO5, },
872 { .name = "lilo1", .driver_data = (void *)LP8725_ID_LILO1, },
873 { .name = "lilo2", .driver_data = (void *)LP8725_ID_LILO2, },
874 { .name = "buck1", .driver_data = (void *)LP8725_ID_BUCK1, },
875 { .name = "buck2", .driver_data = (void *)LP8725_ID_BUCK2, },
876 };
877
878 static struct lp872x_platform_data
879 *lp872x_populate_pdata_from_dt(struct device *dev, enum lp872x_id which)
880 {
881 struct device_node *np = dev->of_node;
882 struct lp872x_platform_data *pdata;
883 struct of_regulator_match *match;
884 int num_matches;
885 int count;
886 int i;
887 u8 dvs_state;
888
889 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
890 if (!pdata)
891 return ERR_PTR(-ENOMEM);
892
893 of_property_read_u8(np, "ti,general-config", &pdata->general_config);
894 if (of_find_property(np, "ti,update-config", NULL))
895 pdata->update_config = true;
896
897 pdata->dvs = devm_kzalloc(dev, sizeof(struct lp872x_dvs), GFP_KERNEL);
898 if (!pdata->dvs)
899 return ERR_PTR(-ENOMEM);
900
901 pdata->dvs->gpio = of_get_named_gpio(np, "ti,dvs-gpio", 0);
902 of_property_read_u8(np, "ti,dvs-vsel", (u8 *)&pdata->dvs->vsel);
903 of_property_read_u8(np, "ti,dvs-state", &dvs_state);
904 pdata->dvs->init_state = dvs_state ? DVS_HIGH : DVS_LOW;
905
906 pdata->enable_gpio = of_get_named_gpio(np, "enable-gpios", 0);
907
908 if (of_get_child_count(np) == 0)
909 goto out;
910
911 switch (which) {
912 case LP8720:
913 match = lp8720_matches;
914 num_matches = ARRAY_SIZE(lp8720_matches);
915 break;
916 case LP8725:
917 match = lp8725_matches;
918 num_matches = ARRAY_SIZE(lp8725_matches);
919 break;
920 default:
921 goto out;
922 }
923
924 count = of_regulator_match(dev, np, match, num_matches);
925 if (count <= 0)
926 goto out;
927
928 for (i = 0; i < num_matches; i++) {
929 pdata->regulator_data[i].id =
930 (enum lp872x_regulator_id)match[i].driver_data;
931 pdata->regulator_data[i].init_data = match[i].init_data;
932 }
933 out:
934 return pdata;
935 }
936 #else
937 static struct lp872x_platform_data
938 *lp872x_populate_pdata_from_dt(struct device *dev, enum lp872x_id which)
939 {
940 return NULL;
941 }
942 #endif
943
944 static int lp872x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
945 {
946 struct lp872x *lp;
947 struct lp872x_platform_data *pdata;
948 int ret;
949 const int lp872x_num_regulators[] = {
950 [LP8720] = LP8720_NUM_REGULATORS,
951 [LP8725] = LP8725_NUM_REGULATORS,
952 };
953
954 if (cl->dev.of_node) {
955 pdata = lp872x_populate_pdata_from_dt(&cl->dev,
956 (enum lp872x_id)id->driver_data);
957 if (IS_ERR(pdata))
958 return PTR_ERR(pdata);
959 } else {
960 pdata = dev_get_platdata(&cl->dev);
961 }
962
963 lp = devm_kzalloc(&cl->dev, sizeof(struct lp872x), GFP_KERNEL);
964 if (!lp)
965 return -ENOMEM;
966
967 lp->num_regulators = lp872x_num_regulators[id->driver_data];
968
969 lp->regmap = devm_regmap_init_i2c(cl, &lp872x_regmap_config);
970 if (IS_ERR(lp->regmap)) {
971 ret = PTR_ERR(lp->regmap);
972 dev_err(&cl->dev, "regmap init i2c err: %d\n", ret);
973 return ret;
974 }
975
976 lp->dev = &cl->dev;
977 lp->pdata = pdata;
978 lp->chipid = id->driver_data;
979 i2c_set_clientdata(cl, lp);
980
981 ret = lp872x_hw_enable(lp);
982 if (ret)
983 return ret;
984
985 ret = lp872x_config(lp);
986 if (ret)
987 return ret;
988
989 return lp872x_regulator_register(lp);
990 }
991
992 static const struct of_device_id lp872x_dt_ids[] = {
993 { .compatible = "ti,lp8720", },
994 { .compatible = "ti,lp8725", },
995 { }
996 };
997 MODULE_DEVICE_TABLE(of, lp872x_dt_ids);
998
999 static const struct i2c_device_id lp872x_ids[] = {
1000 {"lp8720", LP8720},
1001 {"lp8725", LP8725},
1002 { }
1003 };
1004 MODULE_DEVICE_TABLE(i2c, lp872x_ids);
1005
1006 static struct i2c_driver lp872x_driver = {
1007 .driver = {
1008 .name = "lp872x",
1009 .of_match_table = of_match_ptr(lp872x_dt_ids),
1010 },
1011 .probe = lp872x_probe,
1012 .id_table = lp872x_ids,
1013 };
1014
1015 module_i2c_driver(lp872x_driver);
1016
1017 MODULE_DESCRIPTION("TI/National Semiconductor LP872x PMU Regulator Driver");
1018 MODULE_AUTHOR("Milo Kim");
1019 MODULE_LICENSE("GPL");
Linux with added FPC-III support