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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Regulator driver for National Semiconductors LP3971 PMIC chip
4 *
5 * Copyright (C) 2009 Samsung Electronics
6 * Author: Marek Szyprowski <m.szyprowski@samsung.com>
7 *
8 * Based on wm8350.c
9 */
10
11#include <linux/bug.h>
12#include <linux/err.h>
13#include <linux/i2c.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/regulator/driver.h>
17#include <linux/regulator/lp3971.h>
18#include <linux/slab.h>
19
20struct lp3971 {
21 struct device *dev;
22 struct mutex io_lock;
23 struct i2c_client *i2c;
24};
25
26static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
27static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
28
29#define LP3971_SYS_CONTROL1_REG 0x07
30
31/* System control register 1 initial value,
32 bits 4 and 5 are EPROM programmable */
33#define SYS_CONTROL1_INIT_VAL 0x40
34#define SYS_CONTROL1_INIT_MASK 0xCF
35
36#define LP3971_BUCK_VOL_ENABLE_REG 0x10
37#define LP3971_BUCK_VOL_CHANGE_REG 0x20
38
39/* Voltage control registers shift:
40 LP3971_BUCK1 -> 0
41 LP3971_BUCK2 -> 4
42 LP3971_BUCK3 -> 6
43*/
44#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))
45#define BUCK_VOL_CHANGE_FLAG_GO 0x01
46#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
47#define BUCK_VOL_CHANGE_FLAG_MASK 0x03
48
49#define LP3971_BUCK1_BASE 0x23
50#define LP3971_BUCK2_BASE 0x29
51#define LP3971_BUCK3_BASE 0x32
52
53static const int buck_base_addr[] = {
54 LP3971_BUCK1_BASE,
55 LP3971_BUCK2_BASE,
56 LP3971_BUCK3_BASE,
57};
58
59#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
60#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)
61
62static const unsigned int buck_voltage_map[] = {
63 0, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000,
64 1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
65 1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000,
66 3000000, 3300000,
67};
68
69#define BUCK_TARGET_VOL_MASK 0x3f
70
71#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
72
73#define LP3971_LDO_ENABLE_REG 0x12
74#define LP3971_LDO_VOL_CONTR_BASE 0x39
75
76/* Voltage control registers:
77 LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
78 LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
79 LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
80 LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
81 LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
82*/
83#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
84
85/* Voltage control registers shift:
86 LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
87 LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
88 LP3971_LDO5 -> 0
89*/
90#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
91#define LDO_VOL_CONTR_MASK 0x0f
92
93static const unsigned int ldo45_voltage_map[] = {
94 1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
95 1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
96};
97
98static const unsigned int ldo123_voltage_map[] = {
99 1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
100 2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
101};
102
103#define LDO_VOL_MIN_IDX 0x00
104#define LDO_VOL_MAX_IDX 0x0f
105
106static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
107{
108 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
109 int ldo = rdev_get_id(dev) - LP3971_LDO1;
110 u16 mask = 1 << (1 + ldo);
111 u16 val;
112
113 val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
114 return (val & mask) != 0;
115}
116
117static int lp3971_ldo_enable(struct regulator_dev *dev)
118{
119 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
120 int ldo = rdev_get_id(dev) - LP3971_LDO1;
121 u16 mask = 1 << (1 + ldo);
122
123 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
124}
125
126static int lp3971_ldo_disable(struct regulator_dev *dev)
127{
128 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
129 int ldo = rdev_get_id(dev) - LP3971_LDO1;
130 u16 mask = 1 << (1 + ldo);
131
132 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
133}
134
135static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev)
136{
137 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
138 int ldo = rdev_get_id(dev) - LP3971_LDO1;
139 u16 val, reg;
140
141 reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
142 val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
143
144 return val;
145}
146
147static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
148 unsigned int selector)
149{
150 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
151 int ldo = rdev_get_id(dev) - LP3971_LDO1;
152
153 return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
154 LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
155 selector << LDO_VOL_CONTR_SHIFT(ldo));
156}
157
158static const struct regulator_ops lp3971_ldo_ops = {
159 .list_voltage = regulator_list_voltage_table,
160 .map_voltage = regulator_map_voltage_ascend,
161 .is_enabled = lp3971_ldo_is_enabled,
162 .enable = lp3971_ldo_enable,
163 .disable = lp3971_ldo_disable,
164 .get_voltage_sel = lp3971_ldo_get_voltage_sel,
165 .set_voltage_sel = lp3971_ldo_set_voltage_sel,
166};
167
168static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
169{
170 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
171 int buck = rdev_get_id(dev) - LP3971_DCDC1;
172 u16 mask = 1 << (buck * 2);
173 u16 val;
174
175 val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
176 return (val & mask) != 0;
177}
178
179static int lp3971_dcdc_enable(struct regulator_dev *dev)
180{
181 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
182 int buck = rdev_get_id(dev) - LP3971_DCDC1;
183 u16 mask = 1 << (buck * 2);
184
185 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
186}
187
188static int lp3971_dcdc_disable(struct regulator_dev *dev)
189{
190 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
191 int buck = rdev_get_id(dev) - LP3971_DCDC1;
192 u16 mask = 1 << (buck * 2);
193
194 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
195}
196
197static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev)
198{
199 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
200 int buck = rdev_get_id(dev) - LP3971_DCDC1;
201 u16 reg;
202
203 reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
204 reg &= BUCK_TARGET_VOL_MASK;
205
206 return reg;
207}
208
209static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
210 unsigned int selector)
211{
212 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
213 int buck = rdev_get_id(dev) - LP3971_DCDC1;
214 int ret;
215
216 ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
217 BUCK_TARGET_VOL_MASK, selector);
218 if (ret)
219 return ret;
220
221 ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
222 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
223 BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
224 if (ret)
225 return ret;
226
227 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
228 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
229 0 << BUCK_VOL_CHANGE_SHIFT(buck));
230}
231
232static const struct regulator_ops lp3971_dcdc_ops = {
233 .list_voltage = regulator_list_voltage_table,
234 .map_voltage = regulator_map_voltage_ascend,
235 .is_enabled = lp3971_dcdc_is_enabled,
236 .enable = lp3971_dcdc_enable,
237 .disable = lp3971_dcdc_disable,
238 .get_voltage_sel = lp3971_dcdc_get_voltage_sel,
239 .set_voltage_sel = lp3971_dcdc_set_voltage_sel,
240};
241
242static const struct regulator_desc regulators[] = {
243 {
244 .name = "LDO1",
245 .id = LP3971_LDO1,
246 .ops = &lp3971_ldo_ops,
247 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
248 .volt_table = ldo123_voltage_map,
249 .type = REGULATOR_VOLTAGE,
250 .owner = THIS_MODULE,
251 },
252 {
253 .name = "LDO2",
254 .id = LP3971_LDO2,
255 .ops = &lp3971_ldo_ops,
256 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
257 .volt_table = ldo123_voltage_map,
258 .type = REGULATOR_VOLTAGE,
259 .owner = THIS_MODULE,
260 },
261 {
262 .name = "LDO3",
263 .id = LP3971_LDO3,
264 .ops = &lp3971_ldo_ops,
265 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
266 .volt_table = ldo123_voltage_map,
267 .type = REGULATOR_VOLTAGE,
268 .owner = THIS_MODULE,
269 },
270 {
271 .name = "LDO4",
272 .id = LP3971_LDO4,
273 .ops = &lp3971_ldo_ops,
274 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
275 .volt_table = ldo45_voltage_map,
276 .type = REGULATOR_VOLTAGE,
277 .owner = THIS_MODULE,
278 },
279 {
280 .name = "LDO5",
281 .id = LP3971_LDO5,
282 .ops = &lp3971_ldo_ops,
283 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
284 .volt_table = ldo45_voltage_map,
285 .type = REGULATOR_VOLTAGE,
286 .owner = THIS_MODULE,
287 },
288 {
289 .name = "DCDC1",
290 .id = LP3971_DCDC1,
291 .ops = &lp3971_dcdc_ops,
292 .n_voltages = ARRAY_SIZE(buck_voltage_map),
293 .volt_table = buck_voltage_map,
294 .type = REGULATOR_VOLTAGE,
295 .owner = THIS_MODULE,
296 },
297 {
298 .name = "DCDC2",
299 .id = LP3971_DCDC2,
300 .ops = &lp3971_dcdc_ops,
301 .n_voltages = ARRAY_SIZE(buck_voltage_map),
302 .volt_table = buck_voltage_map,
303 .type = REGULATOR_VOLTAGE,
304 .owner = THIS_MODULE,
305 },
306 {
307 .name = "DCDC3",
308 .id = LP3971_DCDC3,
309 .ops = &lp3971_dcdc_ops,
310 .n_voltages = ARRAY_SIZE(buck_voltage_map),
311 .volt_table = buck_voltage_map,
312 .type = REGULATOR_VOLTAGE,
313 .owner = THIS_MODULE,
314 },
315};
316
317static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
318 u16 *dest)
319{
320 int ret;
321
322 if (count != 1)
323 return -EIO;
324 ret = i2c_smbus_read_byte_data(i2c, reg);
325 if (ret < 0)
326 return ret;
327
328 *dest = ret;
329 return 0;
330}
331
332static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
333 const u16 *src)
334{
335 if (count != 1)
336 return -EIO;
337 return i2c_smbus_write_byte_data(i2c, reg, *src);
338}
339
340static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
341{
342 u16 val = 0;
343
344 mutex_lock(&lp3971->io_lock);
345
346 lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
347
348 dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
349 (unsigned)val&0xff);
350
351 mutex_unlock(&lp3971->io_lock);
352
353 return val & 0xff;
354}
355
356static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
357{
358 u16 tmp;
359 int ret;
360
361 mutex_lock(&lp3971->io_lock);
362
363 ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
364 if (ret == 0) {
365 tmp = (tmp & ~mask) | val;
366 ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
367 dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
368 (unsigned)val&0xff);
369 }
370 mutex_unlock(&lp3971->io_lock);
371
372 return ret;
373}
374
375static int setup_regulators(struct lp3971 *lp3971,
376 struct lp3971_platform_data *pdata)
377{
378 int i, err;
379
380 /* Instantiate the regulators */
381 for (i = 0; i < pdata->num_regulators; i++) {
382 struct regulator_config config = { };
383 struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
384 struct regulator_dev *rdev;
385
386 config.dev = lp3971->dev;
387 config.init_data = reg->initdata;
388 config.driver_data = lp3971;
389
390 rdev = devm_regulator_register(lp3971->dev,
391 ®ulators[reg->id], &config);
392 if (IS_ERR(rdev)) {
393 err = PTR_ERR(rdev);
394 dev_err(lp3971->dev, "regulator init failed: %d\n",
395 err);
396 return err;
397 }
398 }
399
400 return 0;
401}
402
403static int lp3971_i2c_probe(struct i2c_client *i2c)
404{
405 struct lp3971 *lp3971;
406 struct lp3971_platform_data *pdata = dev_get_platdata(&i2c->dev);
407 int ret;
408 u16 val;
409
410 if (!pdata) {
411 dev_dbg(&i2c->dev, "No platform init data supplied\n");
412 return -ENODEV;
413 }
414
415 lp3971 = devm_kzalloc(&i2c->dev, sizeof(struct lp3971), GFP_KERNEL);
416 if (lp3971 == NULL)
417 return -ENOMEM;
418
419 lp3971->i2c = i2c;
420 lp3971->dev = &i2c->dev;
421
422 mutex_init(&lp3971->io_lock);
423
424 /* Detect LP3971 */
425 ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
426 if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
427 ret = -ENODEV;
428 if (ret < 0) {
429 dev_err(&i2c->dev, "failed to detect device\n");
430 return ret;
431 }
432
433 ret = setup_regulators(lp3971, pdata);
434 if (ret < 0)
435 return ret;
436
437 i2c_set_clientdata(i2c, lp3971);
438 return 0;
439}
440
441static const struct i2c_device_id lp3971_i2c_id[] = {
442 { "lp3971", 0 },
443 { }
444};
445MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
446
447static struct i2c_driver lp3971_i2c_driver = {
448 .driver = {
449 .name = "LP3971",
450 },
451 .probe_new = lp3971_i2c_probe,
452 .id_table = lp3971_i2c_id,
453};
454
455module_i2c_driver(lp3971_i2c_driver);
456
457MODULE_LICENSE("GPL");
458MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
459MODULE_DESCRIPTION("LP3971 PMIC driver");
1/*
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>
19#include <linux/module.h>
20#include <linux/regulator/driver.h>
21#include <linux/regulator/lp3971.h>
22#include <linux/slab.h>
23
24struct lp3971 {
25 struct device *dev;
26 struct mutex io_lock;
27 struct i2c_client *i2c;
28 int num_regulators;
29 struct regulator_dev **rdev;
30};
31
32static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
33static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
34
35#define LP3971_SYS_CONTROL1_REG 0x07
36
37/* System control register 1 initial value,
38 bits 4 and 5 are EPROM programmable */
39#define SYS_CONTROL1_INIT_VAL 0x40
40#define SYS_CONTROL1_INIT_MASK 0xCF
41
42#define LP3971_BUCK_VOL_ENABLE_REG 0x10
43#define LP3971_BUCK_VOL_CHANGE_REG 0x20
44
45/* Voltage control registers shift:
46 LP3971_BUCK1 -> 0
47 LP3971_BUCK2 -> 4
48 LP3971_BUCK3 -> 6
49*/
50#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))
51#define BUCK_VOL_CHANGE_FLAG_GO 0x01
52#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
53#define BUCK_VOL_CHANGE_FLAG_MASK 0x03
54
55#define LP3971_BUCK1_BASE 0x23
56#define LP3971_BUCK2_BASE 0x29
57#define LP3971_BUCK3_BASE 0x32
58
59static const int buck_base_addr[] = {
60 LP3971_BUCK1_BASE,
61 LP3971_BUCK2_BASE,
62 LP3971_BUCK3_BASE,
63};
64
65#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
66#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)
67
68static const int buck_voltage_map[] = {
69 0, 800, 850, 900, 950, 1000, 1050, 1100,
70 1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500,
71 1550, 1600, 1650, 1700, 1800, 1900, 2500, 2800,
72 3000, 3300,
73};
74
75#define BUCK_TARGET_VOL_MASK 0x3f
76#define BUCK_TARGET_VOL_MIN_IDX 0x01
77#define BUCK_TARGET_VOL_MAX_IDX 0x19
78
79#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
80
81#define LP3971_LDO_ENABLE_REG 0x12
82#define LP3971_LDO_VOL_CONTR_BASE 0x39
83
84/* Voltage control registers:
85 LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
86 LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
87 LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
88 LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
89 LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
90*/
91#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
92
93/* Voltage control registers shift:
94 LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
95 LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
96 LP3971_LDO5 -> 0
97*/
98#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
99#define LDO_VOL_CONTR_MASK 0x0f
100
101static const int ldo45_voltage_map[] = {
102 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350,
103 1400, 1500, 1800, 1900, 2500, 2800, 3000, 3300,
104};
105
106static const int ldo123_voltage_map[] = {
107 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500,
108 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300,
109};
110
111static const int *ldo_voltage_map[] = {
112 ldo123_voltage_map, /* LDO1 */
113 ldo123_voltage_map, /* LDO2 */
114 ldo123_voltage_map, /* LDO3 */
115 ldo45_voltage_map, /* LDO4 */
116 ldo45_voltage_map, /* LDO5 */
117};
118
119#define LDO_VOL_VALUE_MAP(x) (ldo_voltage_map[(x - LP3971_LDO1)])
120
121#define LDO_VOL_MIN_IDX 0x00
122#define LDO_VOL_MAX_IDX 0x0f
123
124static int lp3971_ldo_list_voltage(struct regulator_dev *dev, unsigned index)
125{
126 int ldo = rdev_get_id(dev) - LP3971_LDO1;
127
128 if (index > LDO_VOL_MAX_IDX)
129 return -EINVAL;
130
131 return 1000 * LDO_VOL_VALUE_MAP(ldo)[index];
132}
133
134static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
135{
136 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
137 int ldo = rdev_get_id(dev) - LP3971_LDO1;
138 u16 mask = 1 << (1 + ldo);
139 u16 val;
140
141 val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
142 return (val & mask) != 0;
143}
144
145static int lp3971_ldo_enable(struct regulator_dev *dev)
146{
147 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
148 int ldo = rdev_get_id(dev) - LP3971_LDO1;
149 u16 mask = 1 << (1 + ldo);
150
151 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
152}
153
154static int lp3971_ldo_disable(struct regulator_dev *dev)
155{
156 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
157 int ldo = rdev_get_id(dev) - LP3971_LDO1;
158 u16 mask = 1 << (1 + ldo);
159
160 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
161}
162
163static int lp3971_ldo_get_voltage(struct regulator_dev *dev)
164{
165 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
166 int ldo = rdev_get_id(dev) - LP3971_LDO1;
167 u16 val, reg;
168
169 reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
170 val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
171
172 return 1000 * LDO_VOL_VALUE_MAP(ldo)[val];
173}
174
175static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
176 unsigned int selector)
177{
178 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
179 int ldo = rdev_get_id(dev) - LP3971_LDO1;
180
181 return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
182 LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
183 selector << LDO_VOL_CONTR_SHIFT(ldo));
184}
185
186static struct regulator_ops lp3971_ldo_ops = {
187 .list_voltage = lp3971_ldo_list_voltage,
188 .is_enabled = lp3971_ldo_is_enabled,
189 .enable = lp3971_ldo_enable,
190 .disable = lp3971_ldo_disable,
191 .get_voltage = lp3971_ldo_get_voltage,
192 .set_voltage_sel = lp3971_ldo_set_voltage_sel,
193};
194
195static int lp3971_dcdc_list_voltage(struct regulator_dev *dev, unsigned index)
196{
197 if (index < BUCK_TARGET_VOL_MIN_IDX || index > BUCK_TARGET_VOL_MAX_IDX)
198 return -EINVAL;
199
200 return 1000 * buck_voltage_map[index];
201}
202
203static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
204{
205 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
206 int buck = rdev_get_id(dev) - LP3971_DCDC1;
207 u16 mask = 1 << (buck * 2);
208 u16 val;
209
210 val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
211 return (val & mask) != 0;
212}
213
214static int lp3971_dcdc_enable(struct regulator_dev *dev)
215{
216 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
217 int buck = rdev_get_id(dev) - LP3971_DCDC1;
218 u16 mask = 1 << (buck * 2);
219
220 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
221}
222
223static int lp3971_dcdc_disable(struct regulator_dev *dev)
224{
225 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
226 int buck = rdev_get_id(dev) - LP3971_DCDC1;
227 u16 mask = 1 << (buck * 2);
228
229 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
230}
231
232static int lp3971_dcdc_get_voltage(struct regulator_dev *dev)
233{
234 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
235 int buck = rdev_get_id(dev) - LP3971_DCDC1;
236 u16 reg;
237 int val;
238
239 reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
240 reg &= BUCK_TARGET_VOL_MASK;
241
242 if (reg <= BUCK_TARGET_VOL_MAX_IDX)
243 val = 1000 * buck_voltage_map[reg];
244 else {
245 val = 0;
246 dev_warn(&dev->dev, "chip reported incorrect voltage value.\n");
247 }
248
249 return val;
250}
251
252static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
253 unsigned int selector)
254{
255 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
256 int buck = rdev_get_id(dev) - LP3971_DCDC1;
257 int ret;
258
259 ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
260 BUCK_TARGET_VOL_MASK, selector);
261 if (ret)
262 return ret;
263
264 ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
265 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
266 BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
267 if (ret)
268 return ret;
269
270 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
271 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
272 0 << BUCK_VOL_CHANGE_SHIFT(buck));
273}
274
275static struct regulator_ops lp3971_dcdc_ops = {
276 .list_voltage = lp3971_dcdc_list_voltage,
277 .is_enabled = lp3971_dcdc_is_enabled,
278 .enable = lp3971_dcdc_enable,
279 .disable = lp3971_dcdc_disable,
280 .get_voltage = lp3971_dcdc_get_voltage,
281 .set_voltage_sel = lp3971_dcdc_set_voltage_sel,
282};
283
284static const struct regulator_desc regulators[] = {
285 {
286 .name = "LDO1",
287 .id = LP3971_LDO1,
288 .ops = &lp3971_ldo_ops,
289 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
290 .type = REGULATOR_VOLTAGE,
291 .owner = THIS_MODULE,
292 },
293 {
294 .name = "LDO2",
295 .id = LP3971_LDO2,
296 .ops = &lp3971_ldo_ops,
297 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
298 .type = REGULATOR_VOLTAGE,
299 .owner = THIS_MODULE,
300 },
301 {
302 .name = "LDO3",
303 .id = LP3971_LDO3,
304 .ops = &lp3971_ldo_ops,
305 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
306 .type = REGULATOR_VOLTAGE,
307 .owner = THIS_MODULE,
308 },
309 {
310 .name = "LDO4",
311 .id = LP3971_LDO4,
312 .ops = &lp3971_ldo_ops,
313 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
314 .type = REGULATOR_VOLTAGE,
315 .owner = THIS_MODULE,
316 },
317 {
318 .name = "LDO5",
319 .id = LP3971_LDO5,
320 .ops = &lp3971_ldo_ops,
321 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
322 .type = REGULATOR_VOLTAGE,
323 .owner = THIS_MODULE,
324 },
325 {
326 .name = "DCDC1",
327 .id = LP3971_DCDC1,
328 .ops = &lp3971_dcdc_ops,
329 .n_voltages = ARRAY_SIZE(buck_voltage_map),
330 .type = REGULATOR_VOLTAGE,
331 .owner = THIS_MODULE,
332 },
333 {
334 .name = "DCDC2",
335 .id = LP3971_DCDC2,
336 .ops = &lp3971_dcdc_ops,
337 .n_voltages = ARRAY_SIZE(buck_voltage_map),
338 .type = REGULATOR_VOLTAGE,
339 .owner = THIS_MODULE,
340 },
341 {
342 .name = "DCDC3",
343 .id = LP3971_DCDC3,
344 .ops = &lp3971_dcdc_ops,
345 .n_voltages = ARRAY_SIZE(buck_voltage_map),
346 .type = REGULATOR_VOLTAGE,
347 .owner = THIS_MODULE,
348 },
349};
350
351static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
352 u16 *dest)
353{
354 int ret;
355
356 if (count != 1)
357 return -EIO;
358 ret = i2c_smbus_read_byte_data(i2c, reg);
359 if (ret < 0)
360 return -EIO;
361
362 *dest = ret;
363 return 0;
364}
365
366static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
367 const u16 *src)
368{
369 if (count != 1)
370 return -EIO;
371 return i2c_smbus_write_byte_data(i2c, reg, *src);
372}
373
374static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
375{
376 u16 val = 0;
377
378 mutex_lock(&lp3971->io_lock);
379
380 lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
381
382 dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
383 (unsigned)val&0xff);
384
385 mutex_unlock(&lp3971->io_lock);
386
387 return val & 0xff;
388}
389
390static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
391{
392 u16 tmp;
393 int ret;
394
395 mutex_lock(&lp3971->io_lock);
396
397 ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
398 tmp = (tmp & ~mask) | val;
399 if (ret == 0) {
400 ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
401 dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
402 (unsigned)val&0xff);
403 }
404 mutex_unlock(&lp3971->io_lock);
405
406 return ret;
407}
408
409static int __devinit setup_regulators(struct lp3971 *lp3971,
410 struct lp3971_platform_data *pdata)
411{
412 int i, err;
413
414 lp3971->num_regulators = pdata->num_regulators;
415 lp3971->rdev = kcalloc(pdata->num_regulators,
416 sizeof(struct regulator_dev *), GFP_KERNEL);
417 if (!lp3971->rdev) {
418 err = -ENOMEM;
419 goto err_nomem;
420 }
421
422 /* Instantiate the regulators */
423 for (i = 0; i < pdata->num_regulators; i++) {
424 struct regulator_config config = { };
425 struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
426
427 config.dev = lp3971->dev;
428 config.init_data = reg->initdata;
429 config.driver_data = lp3971;
430
431 lp3971->rdev[i] = regulator_register(®ulators[reg->id],
432 &config);
433 if (IS_ERR(lp3971->rdev[i])) {
434 err = PTR_ERR(lp3971->rdev[i]);
435 dev_err(lp3971->dev, "regulator init failed: %d\n",
436 err);
437 goto error;
438 }
439 }
440
441 return 0;
442
443error:
444 while (--i >= 0)
445 regulator_unregister(lp3971->rdev[i]);
446 kfree(lp3971->rdev);
447 lp3971->rdev = NULL;
448err_nomem:
449 return err;
450}
451
452static int __devinit lp3971_i2c_probe(struct i2c_client *i2c,
453 const struct i2c_device_id *id)
454{
455 struct lp3971 *lp3971;
456 struct lp3971_platform_data *pdata = i2c->dev.platform_data;
457 int ret;
458 u16 val;
459
460 if (!pdata) {
461 dev_dbg(&i2c->dev, "No platform init data supplied\n");
462 return -ENODEV;
463 }
464
465 lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL);
466 if (lp3971 == NULL)
467 return -ENOMEM;
468
469 lp3971->i2c = i2c;
470 lp3971->dev = &i2c->dev;
471
472 mutex_init(&lp3971->io_lock);
473
474 /* Detect LP3971 */
475 ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
476 if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
477 ret = -ENODEV;
478 if (ret < 0) {
479 dev_err(&i2c->dev, "failed to detect device\n");
480 goto err_detect;
481 }
482
483 ret = setup_regulators(lp3971, pdata);
484 if (ret < 0)
485 goto err_detect;
486
487 i2c_set_clientdata(i2c, lp3971);
488 return 0;
489
490err_detect:
491 kfree(lp3971);
492 return ret;
493}
494
495static int __devexit lp3971_i2c_remove(struct i2c_client *i2c)
496{
497 struct lp3971 *lp3971 = i2c_get_clientdata(i2c);
498 int i;
499
500 for (i = 0; i < lp3971->num_regulators; i++)
501 regulator_unregister(lp3971->rdev[i]);
502
503 kfree(lp3971->rdev);
504 kfree(lp3971);
505
506 return 0;
507}
508
509static const struct i2c_device_id lp3971_i2c_id[] = {
510 { "lp3971", 0 },
511 { }
512};
513MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
514
515static struct i2c_driver lp3971_i2c_driver = {
516 .driver = {
517 .name = "LP3971",
518 .owner = THIS_MODULE,
519 },
520 .probe = lp3971_i2c_probe,
521 .remove = __devexit_p(lp3971_i2c_remove),
522 .id_table = lp3971_i2c_id,
523};
524
525module_i2c_driver(lp3971_i2c_driver);
526
527MODULE_LICENSE("GPL");
528MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
529MODULE_DESCRIPTION("LP3971 PMIC driver");