2 * Regulator driver for National Semiconductors LP3971 PMIC chip
4 * Copyright (C) 2009 Samsung Electronics
5 * Author: Marek Szyprowski <m.szyprowski@samsung.com>
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.
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>
27 struct i2c_client *i2c;
29 struct regulator_dev **rdev;
32 static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
33 static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
35 #define LP3971_SYS_CONTROL1_REG 0x07
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
42 #define LP3971_BUCK_VOL_ENABLE_REG 0x10
43 #define LP3971_BUCK_VOL_CHANGE_REG 0x20
45 /* Voltage control registers shift:
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
55 #define LP3971_BUCK1_BASE 0x23
56 #define LP3971_BUCK2_BASE 0x29
57 #define LP3971_BUCK3_BASE 0x32
59 static const int buck_base_addr[] = {
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)
68 static const unsigned int buck_voltage_map[] = {
69 0, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000,
70 1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
71 1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000,
75 #define BUCK_TARGET_VOL_MASK 0x3f
77 #define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
79 #define LP3971_LDO_ENABLE_REG 0x12
80 #define LP3971_LDO_VOL_CONTR_BASE 0x39
82 /* Voltage control registers:
83 LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
84 LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
85 LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
86 LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
87 LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
89 #define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
91 /* Voltage control registers shift:
92 LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
93 LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
96 #define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
97 #define LDO_VOL_CONTR_MASK 0x0f
99 static const unsigned int ldo45_voltage_map[] = {
100 1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
101 1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
104 static const unsigned int ldo123_voltage_map[] = {
105 1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
106 2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
109 #define LDO_VOL_MIN_IDX 0x00
110 #define LDO_VOL_MAX_IDX 0x0f
112 static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
114 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
115 int ldo = rdev_get_id(dev) - LP3971_LDO1;
116 u16 mask = 1 << (1 + ldo);
119 val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
120 return (val & mask) != 0;
123 static int lp3971_ldo_enable(struct regulator_dev *dev)
125 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
126 int ldo = rdev_get_id(dev) - LP3971_LDO1;
127 u16 mask = 1 << (1 + ldo);
129 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
132 static int lp3971_ldo_disable(struct regulator_dev *dev)
134 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
135 int ldo = rdev_get_id(dev) - LP3971_LDO1;
136 u16 mask = 1 << (1 + ldo);
138 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
141 static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev)
143 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
144 int ldo = rdev_get_id(dev) - LP3971_LDO1;
147 reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
148 val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
153 static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
154 unsigned int selector)
156 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
157 int ldo = rdev_get_id(dev) - LP3971_LDO1;
159 return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
160 LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
161 selector << LDO_VOL_CONTR_SHIFT(ldo));
164 static struct regulator_ops lp3971_ldo_ops = {
165 .list_voltage = regulator_list_voltage_table,
166 .map_voltage = regulator_map_voltage_ascend,
167 .is_enabled = lp3971_ldo_is_enabled,
168 .enable = lp3971_ldo_enable,
169 .disable = lp3971_ldo_disable,
170 .get_voltage_sel = lp3971_ldo_get_voltage_sel,
171 .set_voltage_sel = lp3971_ldo_set_voltage_sel,
174 static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
176 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
177 int buck = rdev_get_id(dev) - LP3971_DCDC1;
178 u16 mask = 1 << (buck * 2);
181 val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
182 return (val & mask) != 0;
185 static int lp3971_dcdc_enable(struct regulator_dev *dev)
187 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
188 int buck = rdev_get_id(dev) - LP3971_DCDC1;
189 u16 mask = 1 << (buck * 2);
191 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
194 static int lp3971_dcdc_disable(struct regulator_dev *dev)
196 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
197 int buck = rdev_get_id(dev) - LP3971_DCDC1;
198 u16 mask = 1 << (buck * 2);
200 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
203 static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev)
205 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
206 int buck = rdev_get_id(dev) - LP3971_DCDC1;
209 reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
210 reg &= BUCK_TARGET_VOL_MASK;
215 static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
216 unsigned int selector)
218 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
219 int buck = rdev_get_id(dev) - LP3971_DCDC1;
222 ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
223 BUCK_TARGET_VOL_MASK, selector);
227 ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
228 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
229 BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
233 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
234 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
235 0 << BUCK_VOL_CHANGE_SHIFT(buck));
238 static struct regulator_ops lp3971_dcdc_ops = {
239 .list_voltage = regulator_list_voltage_table,
240 .map_voltage = regulator_map_voltage_ascend,
241 .is_enabled = lp3971_dcdc_is_enabled,
242 .enable = lp3971_dcdc_enable,
243 .disable = lp3971_dcdc_disable,
244 .get_voltage_sel = lp3971_dcdc_get_voltage_sel,
245 .set_voltage_sel = lp3971_dcdc_set_voltage_sel,
248 static const struct regulator_desc regulators[] = {
252 .ops = &lp3971_ldo_ops,
253 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
254 .volt_table = ldo123_voltage_map,
255 .type = REGULATOR_VOLTAGE,
256 .owner = THIS_MODULE,
261 .ops = &lp3971_ldo_ops,
262 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
263 .volt_table = ldo123_voltage_map,
264 .type = REGULATOR_VOLTAGE,
265 .owner = THIS_MODULE,
270 .ops = &lp3971_ldo_ops,
271 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
272 .volt_table = ldo123_voltage_map,
273 .type = REGULATOR_VOLTAGE,
274 .owner = THIS_MODULE,
279 .ops = &lp3971_ldo_ops,
280 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
281 .volt_table = ldo45_voltage_map,
282 .type = REGULATOR_VOLTAGE,
283 .owner = THIS_MODULE,
288 .ops = &lp3971_ldo_ops,
289 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
290 .volt_table = ldo45_voltage_map,
291 .type = REGULATOR_VOLTAGE,
292 .owner = THIS_MODULE,
297 .ops = &lp3971_dcdc_ops,
298 .n_voltages = ARRAY_SIZE(buck_voltage_map),
299 .volt_table = buck_voltage_map,
300 .type = REGULATOR_VOLTAGE,
301 .owner = THIS_MODULE,
306 .ops = &lp3971_dcdc_ops,
307 .n_voltages = ARRAY_SIZE(buck_voltage_map),
308 .volt_table = buck_voltage_map,
309 .type = REGULATOR_VOLTAGE,
310 .owner = THIS_MODULE,
315 .ops = &lp3971_dcdc_ops,
316 .n_voltages = ARRAY_SIZE(buck_voltage_map),
317 .volt_table = buck_voltage_map,
318 .type = REGULATOR_VOLTAGE,
319 .owner = THIS_MODULE,
323 static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
330 ret = i2c_smbus_read_byte_data(i2c, reg);
338 static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
343 return i2c_smbus_write_byte_data(i2c, reg, *src);
346 static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
350 mutex_lock(&lp3971->io_lock);
352 lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
354 dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
357 mutex_unlock(&lp3971->io_lock);
362 static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
367 mutex_lock(&lp3971->io_lock);
369 ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
370 tmp = (tmp & ~mask) | val;
372 ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
373 dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
376 mutex_unlock(&lp3971->io_lock);
381 static int setup_regulators(struct lp3971 *lp3971,
382 struct lp3971_platform_data *pdata)
386 lp3971->num_regulators = pdata->num_regulators;
387 lp3971->rdev = kcalloc(pdata->num_regulators,
388 sizeof(struct regulator_dev *), GFP_KERNEL);
394 /* Instantiate the regulators */
395 for (i = 0; i < pdata->num_regulators; i++) {
396 struct regulator_config config = { };
397 struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
399 config.dev = lp3971->dev;
400 config.init_data = reg->initdata;
401 config.driver_data = lp3971;
403 lp3971->rdev[i] = regulator_register(®ulators[reg->id],
405 if (IS_ERR(lp3971->rdev[i])) {
406 err = PTR_ERR(lp3971->rdev[i]);
407 dev_err(lp3971->dev, "regulator init failed: %d\n",
417 regulator_unregister(lp3971->rdev[i]);
424 static int lp3971_i2c_probe(struct i2c_client *i2c,
425 const struct i2c_device_id *id)
427 struct lp3971 *lp3971;
428 struct lp3971_platform_data *pdata = i2c->dev.platform_data;
433 dev_dbg(&i2c->dev, "No platform init data supplied\n");
437 lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL);
442 lp3971->dev = &i2c->dev;
444 mutex_init(&lp3971->io_lock);
447 ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
448 if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
451 dev_err(&i2c->dev, "failed to detect device\n");
455 ret = setup_regulators(lp3971, pdata);
459 i2c_set_clientdata(i2c, lp3971);
467 static int lp3971_i2c_remove(struct i2c_client *i2c)
469 struct lp3971 *lp3971 = i2c_get_clientdata(i2c);
472 for (i = 0; i < lp3971->num_regulators; i++)
473 regulator_unregister(lp3971->rdev[i]);
481 static const struct i2c_device_id lp3971_i2c_id[] = {
485 MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
487 static struct i2c_driver lp3971_i2c_driver = {
490 .owner = THIS_MODULE,
492 .probe = lp3971_i2c_probe,
493 .remove = lp3971_i2c_remove,
494 .id_table = lp3971_i2c_id,
497 module_i2c_driver(lp3971_i2c_driver);
499 MODULE_LICENSE("GPL");
500 MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
501 MODULE_DESCRIPTION("LP3971 PMIC driver");