blob: 3b1102b75071f9d9f73fa0b34db63e43f9784614 [file] [log] [blame]
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +02001/*
2 * Regulator driver for National Semiconductors LP3971 PMIC chip
3 *
4 * Copyright (C) 2009 Samsung Electronics
5 * Author: Marek Szyprowski <m.szyprowski@samsung.com>
6 *
7 * Based on wm8350.c
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 */
14
15#include <linux/bug.h>
16#include <linux/err.h>
17#include <linux/i2c.h>
18#include <linux/kernel.h>
Paul Gortmaker65602c32011-07-17 16:28:23 -040019#include <linux/module.h>
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +020020#include <linux/regulator/driver.h>
21#include <linux/regulator/lp3971.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +020023
24struct lp3971 {
25 struct device *dev;
26 struct mutex io_lock;
27 struct i2c_client *i2c;
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +020028};
29
30static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
31static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
32
33#define LP3971_SYS_CONTROL1_REG 0x07
34
35/* System control register 1 initial value,
36 bits 4 and 5 are EPROM programmable */
37#define SYS_CONTROL1_INIT_VAL 0x40
38#define SYS_CONTROL1_INIT_MASK 0xCF
39
40#define LP3971_BUCK_VOL_ENABLE_REG 0x10
41#define LP3971_BUCK_VOL_CHANGE_REG 0x20
42
43/* Voltage control registers shift:
44 LP3971_BUCK1 -> 0
45 LP3971_BUCK2 -> 4
46 LP3971_BUCK3 -> 6
47*/
Axel Lin451a73c2010-03-11 09:50:07 +080048#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +020049#define BUCK_VOL_CHANGE_FLAG_GO 0x01
50#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
51#define BUCK_VOL_CHANGE_FLAG_MASK 0x03
52
53#define LP3971_BUCK1_BASE 0x23
54#define LP3971_BUCK2_BASE 0x29
55#define LP3971_BUCK3_BASE 0x32
56
Tobias Klauser6faa7e02009-12-23 14:13:17 +010057static const int buck_base_addr[] = {
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +020058 LP3971_BUCK1_BASE,
59 LP3971_BUCK2_BASE,
60 LP3971_BUCK3_BASE,
61};
62
63#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
64#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)
65
Axel Lincad8d762012-05-20 13:30:28 +080066static const unsigned int buck_voltage_map[] = {
67 0, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000,
68 1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
69 1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000,
70 3000000, 3300000,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +020071};
72
73#define BUCK_TARGET_VOL_MASK 0x3f
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +020074
75#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
76
77#define LP3971_LDO_ENABLE_REG 0x12
78#define LP3971_LDO_VOL_CONTR_BASE 0x39
79
80/* Voltage control registers:
81 LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
82 LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
83 LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
84 LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
85 LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
86*/
87#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
88
89/* Voltage control registers shift:
90 LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
91 LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
92 LP3971_LDO5 -> 0
93*/
94#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
95#define LDO_VOL_CONTR_MASK 0x0f
96
Axel Lincad8d762012-05-20 13:30:28 +080097static const unsigned int ldo45_voltage_map[] = {
98 1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
99 1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200100};
101
Axel Lincad8d762012-05-20 13:30:28 +0800102static const unsigned int ldo123_voltage_map[] = {
103 1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
104 2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200105};
106
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200107#define LDO_VOL_MIN_IDX 0x00
108#define LDO_VOL_MAX_IDX 0x0f
109
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200110static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
111{
112 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
113 int ldo = rdev_get_id(dev) - LP3971_LDO1;
114 u16 mask = 1 << (1 + ldo);
115 u16 val;
116
117 val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
118 return (val & mask) != 0;
119}
120
121static int lp3971_ldo_enable(struct regulator_dev *dev)
122{
123 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
124 int ldo = rdev_get_id(dev) - LP3971_LDO1;
125 u16 mask = 1 << (1 + ldo);
126
127 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
128}
129
130static int lp3971_ldo_disable(struct regulator_dev *dev)
131{
132 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
133 int ldo = rdev_get_id(dev) - LP3971_LDO1;
134 u16 mask = 1 << (1 + ldo);
135
136 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
137}
138
Axel Linf38482f2012-12-10 19:46:52 +0800139static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev)
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200140{
141 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
142 int ldo = rdev_get_id(dev) - LP3971_LDO1;
143 u16 val, reg;
144
145 reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
146 val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
147
Axel Linf38482f2012-12-10 19:46:52 +0800148 return val;
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200149}
150
Axel Lindd8e2312012-03-23 10:49:54 +0800151static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
152 unsigned int selector)
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200153{
154 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
155 int ldo = rdev_get_id(dev) - LP3971_LDO1;
Mark Brown3a93f2a2010-11-10 14:38:29 +0000156
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200157 return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
Axel Lincdb868f2010-03-09 16:53:59 +0800158 LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
Axel Lindd8e2312012-03-23 10:49:54 +0800159 selector << LDO_VOL_CONTR_SHIFT(ldo));
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200160}
161
162static struct regulator_ops lp3971_ldo_ops = {
Axel Lincad8d762012-05-20 13:30:28 +0800163 .list_voltage = regulator_list_voltage_table,
Axel Lin3e655612013-04-21 00:35:31 +0800164 .map_voltage = regulator_map_voltage_ascend,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200165 .is_enabled = lp3971_ldo_is_enabled,
166 .enable = lp3971_ldo_enable,
167 .disable = lp3971_ldo_disable,
Axel Linf38482f2012-12-10 19:46:52 +0800168 .get_voltage_sel = lp3971_ldo_get_voltage_sel,
Axel Lindd8e2312012-03-23 10:49:54 +0800169 .set_voltage_sel = lp3971_ldo_set_voltage_sel,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200170};
171
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200172static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
173{
174 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
175 int buck = rdev_get_id(dev) - LP3971_DCDC1;
176 u16 mask = 1 << (buck * 2);
177 u16 val;
178
179 val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
180 return (val & mask) != 0;
181}
182
183static int lp3971_dcdc_enable(struct regulator_dev *dev)
184{
185 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
186 int buck = rdev_get_id(dev) - LP3971_DCDC1;
187 u16 mask = 1 << (buck * 2);
188
189 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
190}
191
192static int lp3971_dcdc_disable(struct regulator_dev *dev)
193{
194 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
195 int buck = rdev_get_id(dev) - LP3971_DCDC1;
196 u16 mask = 1 << (buck * 2);
197
198 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
199}
200
Axel Linf38482f2012-12-10 19:46:52 +0800201static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev)
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200202{
203 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
204 int buck = rdev_get_id(dev) - LP3971_DCDC1;
205 u16 reg;
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200206
207 reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
208 reg &= BUCK_TARGET_VOL_MASK;
209
Axel Linf38482f2012-12-10 19:46:52 +0800210 return reg;
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200211}
212
Axel Lindd8e2312012-03-23 10:49:54 +0800213static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
214 unsigned int selector)
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200215{
216 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
217 int buck = rdev_get_id(dev) - LP3971_DCDC1;
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200218 int ret;
219
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200220 ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
Axel Lindd8e2312012-03-23 10:49:54 +0800221 BUCK_TARGET_VOL_MASK, selector);
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200222 if (ret)
223 return ret;
224
225 ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
226 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
227 BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
228 if (ret)
229 return ret;
230
231 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
232 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
233 0 << BUCK_VOL_CHANGE_SHIFT(buck));
234}
235
236static struct regulator_ops lp3971_dcdc_ops = {
Axel Lincad8d762012-05-20 13:30:28 +0800237 .list_voltage = regulator_list_voltage_table,
Axel Lin3e655612013-04-21 00:35:31 +0800238 .map_voltage = regulator_map_voltage_ascend,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200239 .is_enabled = lp3971_dcdc_is_enabled,
240 .enable = lp3971_dcdc_enable,
241 .disable = lp3971_dcdc_disable,
Axel Linf38482f2012-12-10 19:46:52 +0800242 .get_voltage_sel = lp3971_dcdc_get_voltage_sel,
Axel Lindd8e2312012-03-23 10:49:54 +0800243 .set_voltage_sel = lp3971_dcdc_set_voltage_sel,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200244};
245
Axel Lin14add4f2012-04-05 11:59:20 +0800246static const struct regulator_desc regulators[] = {
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200247 {
248 .name = "LDO1",
249 .id = LP3971_LDO1,
250 .ops = &lp3971_ldo_ops,
251 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
Axel Lincad8d762012-05-20 13:30:28 +0800252 .volt_table = ldo123_voltage_map,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200253 .type = REGULATOR_VOLTAGE,
254 .owner = THIS_MODULE,
255 },
256 {
257 .name = "LDO2",
258 .id = LP3971_LDO2,
259 .ops = &lp3971_ldo_ops,
260 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
Axel Lincad8d762012-05-20 13:30:28 +0800261 .volt_table = ldo123_voltage_map,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200262 .type = REGULATOR_VOLTAGE,
263 .owner = THIS_MODULE,
264 },
265 {
266 .name = "LDO3",
267 .id = LP3971_LDO3,
268 .ops = &lp3971_ldo_ops,
269 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
Axel Lincad8d762012-05-20 13:30:28 +0800270 .volt_table = ldo123_voltage_map,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200271 .type = REGULATOR_VOLTAGE,
272 .owner = THIS_MODULE,
273 },
274 {
275 .name = "LDO4",
276 .id = LP3971_LDO4,
277 .ops = &lp3971_ldo_ops,
278 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
Axel Lincad8d762012-05-20 13:30:28 +0800279 .volt_table = ldo45_voltage_map,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200280 .type = REGULATOR_VOLTAGE,
281 .owner = THIS_MODULE,
282 },
283 {
284 .name = "LDO5",
285 .id = LP3971_LDO5,
286 .ops = &lp3971_ldo_ops,
287 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
Axel Lincad8d762012-05-20 13:30:28 +0800288 .volt_table = ldo45_voltage_map,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200289 .type = REGULATOR_VOLTAGE,
290 .owner = THIS_MODULE,
291 },
292 {
293 .name = "DCDC1",
294 .id = LP3971_DCDC1,
295 .ops = &lp3971_dcdc_ops,
296 .n_voltages = ARRAY_SIZE(buck_voltage_map),
Axel Lincad8d762012-05-20 13:30:28 +0800297 .volt_table = buck_voltage_map,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200298 .type = REGULATOR_VOLTAGE,
299 .owner = THIS_MODULE,
300 },
301 {
302 .name = "DCDC2",
303 .id = LP3971_DCDC2,
304 .ops = &lp3971_dcdc_ops,
305 .n_voltages = ARRAY_SIZE(buck_voltage_map),
Axel Lincad8d762012-05-20 13:30:28 +0800306 .volt_table = buck_voltage_map,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200307 .type = REGULATOR_VOLTAGE,
308 .owner = THIS_MODULE,
309 },
310 {
311 .name = "DCDC3",
312 .id = LP3971_DCDC3,
313 .ops = &lp3971_dcdc_ops,
314 .n_voltages = ARRAY_SIZE(buck_voltage_map),
Axel Lincad8d762012-05-20 13:30:28 +0800315 .volt_table = buck_voltage_map,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200316 .type = REGULATOR_VOLTAGE,
317 .owner = THIS_MODULE,
318 },
319};
320
321static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
322 u16 *dest)
323{
324 int ret;
325
326 if (count != 1)
327 return -EIO;
328 ret = i2c_smbus_read_byte_data(i2c, reg);
Axel Lin27ef7f02010-08-06 08:09:14 +0800329 if (ret < 0)
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200330 return -EIO;
331
332 *dest = ret;
333 return 0;
334}
335
336static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
337 const u16 *src)
338{
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200339 if (count != 1)
340 return -EIO;
Axel Lin1bddc2f2010-08-09 17:01:21 +0800341 return i2c_smbus_write_byte_data(i2c, reg, *src);
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200342}
343
344static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
345{
346 u16 val = 0;
347
348 mutex_lock(&lp3971->io_lock);
349
350 lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
351
352 dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
353 (unsigned)val&0xff);
354
355 mutex_unlock(&lp3971->io_lock);
356
357 return val & 0xff;
358}
359
360static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
361{
362 u16 tmp;
363 int ret;
364
365 mutex_lock(&lp3971->io_lock);
366
367 ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
368 tmp = (tmp & ~mask) | val;
369 if (ret == 0) {
370 ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
371 dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
372 (unsigned)val&0xff);
373 }
374 mutex_unlock(&lp3971->io_lock);
375
376 return ret;
377}
378
Bill Pembertona5023572012-11-19 13:22:22 -0500379static int setup_regulators(struct lp3971 *lp3971,
Dmitry Torokhovebbed042010-02-23 23:38:17 -0800380 struct lp3971_platform_data *pdata)
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200381{
382 int i, err;
Dmitry Torokhovebbed042010-02-23 23:38:17 -0800383
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200384 /* Instantiate the regulators */
Dmitry Torokhovebbed042010-02-23 23:38:17 -0800385 for (i = 0; i < pdata->num_regulators; i++) {
Mark Brownc1727082012-04-04 00:50:22 +0100386 struct regulator_config config = { };
Dmitry Torokhovebbed042010-02-23 23:38:17 -0800387 struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
Axel Lin56dde802013-11-13 14:52:26 +0800388 struct regulator_dev *rdev;
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200389
Mark Brownc1727082012-04-04 00:50:22 +0100390 config.dev = lp3971->dev;
391 config.init_data = reg->initdata;
392 config.driver_data = lp3971;
393
Axel Lin56dde802013-11-13 14:52:26 +0800394 rdev = devm_regulator_register(lp3971->dev,
395 &regulators[reg->id], &config);
396 if (IS_ERR(rdev)) {
397 err = PTR_ERR(rdev);
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200398 dev_err(lp3971->dev, "regulator init failed: %d\n",
399 err);
Axel Lin56dde802013-11-13 14:52:26 +0800400 return err;
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200401 }
402 }
403
404 return 0;
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200405}
406
Bill Pembertona5023572012-11-19 13:22:22 -0500407static int lp3971_i2c_probe(struct i2c_client *i2c,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200408 const struct i2c_device_id *id)
409{
410 struct lp3971 *lp3971;
Jingoo Handff91d02013-07-30 17:20:47 +0900411 struct lp3971_platform_data *pdata = dev_get_platdata(&i2c->dev);
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200412 int ret;
413 u16 val;
414
Dmitry Torokhovebbed042010-02-23 23:38:17 -0800415 if (!pdata) {
416 dev_dbg(&i2c->dev, "No platform init data supplied\n");
417 return -ENODEV;
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200418 }
419
Nikolay Balandin2af0af62013-05-25 14:50:40 -0700420 lp3971 = devm_kzalloc(&i2c->dev, sizeof(struct lp3971), GFP_KERNEL);
Dmitry Torokhovebbed042010-02-23 23:38:17 -0800421 if (lp3971 == NULL)
422 return -ENOMEM;
423
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200424 lp3971->i2c = i2c;
425 lp3971->dev = &i2c->dev;
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200426
427 mutex_init(&lp3971->io_lock);
428
429 /* Detect LP3971 */
430 ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
431 if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
432 ret = -ENODEV;
433 if (ret < 0) {
434 dev_err(&i2c->dev, "failed to detect device\n");
Nikolay Balandin2af0af62013-05-25 14:50:40 -0700435 return ret;
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200436 }
437
Dmitry Torokhovebbed042010-02-23 23:38:17 -0800438 ret = setup_regulators(lp3971, pdata);
439 if (ret < 0)
Nikolay Balandin2af0af62013-05-25 14:50:40 -0700440 return ret;
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200441
Dmitry Torokhovebbed042010-02-23 23:38:17 -0800442 i2c_set_clientdata(i2c, lp3971);
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200443 return 0;
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200444}
445
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200446static const struct i2c_device_id lp3971_i2c_id[] = {
Jingoo Han0a3ee932013-10-14 17:47:31 +0900447 { "lp3971", 0 },
448 { }
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200449};
450MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
451
452static struct i2c_driver lp3971_i2c_driver = {
453 .driver = {
454 .name = "LP3971",
455 .owner = THIS_MODULE,
456 },
457 .probe = lp3971_i2c_probe,
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200458 .id_table = lp3971_i2c_id,
459};
460
Mark Brown5af34e62012-04-03 23:33:10 +0100461module_i2c_driver(lp3971_i2c_driver);
Marek Szyprowski0cbdf7b2009-05-19 07:33:55 +0200462
463MODULE_LICENSE("GPL");
464MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
465MODULE_DESCRIPTION("LP3971 PMIC driver");