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
76 #define BUCK_TARGET_VOL_MIN_IDX 0x01
77 #define BUCK_TARGET_VOL_MAX_IDX 0x19
79 #define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
81 #define LP3971_LDO_ENABLE_REG 0x12
82 #define LP3971_LDO_VOL_CONTR_BASE 0x39
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
91 #define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
93 /* Voltage control registers shift:
94 LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
95 LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
98 #define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
99 #define LDO_VOL_CONTR_MASK 0x0f
101 static const unsigned int ldo45_voltage_map
[] = {
102 1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
103 1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
106 static const unsigned int ldo123_voltage_map
[] = {
107 1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
108 2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
111 #define LDO_VOL_MIN_IDX 0x00
112 #define LDO_VOL_MAX_IDX 0x0f
114 static int lp3971_ldo_is_enabled(struct regulator_dev
*dev
)
116 struct lp3971
*lp3971
= rdev_get_drvdata(dev
);
117 int ldo
= rdev_get_id(dev
) - LP3971_LDO1
;
118 u16 mask
= 1 << (1 + ldo
);
121 val
= lp3971_reg_read(lp3971
, LP3971_LDO_ENABLE_REG
);
122 return (val
& mask
) != 0;
125 static int lp3971_ldo_enable(struct regulator_dev
*dev
)
127 struct lp3971
*lp3971
= rdev_get_drvdata(dev
);
128 int ldo
= rdev_get_id(dev
) - LP3971_LDO1
;
129 u16 mask
= 1 << (1 + ldo
);
131 return lp3971_set_bits(lp3971
, LP3971_LDO_ENABLE_REG
, mask
, mask
);
134 static int lp3971_ldo_disable(struct regulator_dev
*dev
)
136 struct lp3971
*lp3971
= rdev_get_drvdata(dev
);
137 int ldo
= rdev_get_id(dev
) - LP3971_LDO1
;
138 u16 mask
= 1 << (1 + ldo
);
140 return lp3971_set_bits(lp3971
, LP3971_LDO_ENABLE_REG
, mask
, 0);
143 static int lp3971_ldo_get_voltage(struct regulator_dev
*dev
)
145 struct lp3971
*lp3971
= rdev_get_drvdata(dev
);
146 int ldo
= rdev_get_id(dev
) - LP3971_LDO1
;
149 reg
= lp3971_reg_read(lp3971
, LP3971_LDO_VOL_CONTR_REG(ldo
));
150 val
= (reg
>> LDO_VOL_CONTR_SHIFT(ldo
)) & LDO_VOL_CONTR_MASK
;
152 return dev
->desc
->volt_table
[val
];
155 static int lp3971_ldo_set_voltage_sel(struct regulator_dev
*dev
,
156 unsigned int selector
)
158 struct lp3971
*lp3971
= rdev_get_drvdata(dev
);
159 int ldo
= rdev_get_id(dev
) - LP3971_LDO1
;
161 return lp3971_set_bits(lp3971
, LP3971_LDO_VOL_CONTR_REG(ldo
),
162 LDO_VOL_CONTR_MASK
<< LDO_VOL_CONTR_SHIFT(ldo
),
163 selector
<< LDO_VOL_CONTR_SHIFT(ldo
));
166 static struct regulator_ops lp3971_ldo_ops
= {
167 .list_voltage
= regulator_list_voltage_table
,
168 .is_enabled
= lp3971_ldo_is_enabled
,
169 .enable
= lp3971_ldo_enable
,
170 .disable
= lp3971_ldo_disable
,
171 .get_voltage
= lp3971_ldo_get_voltage
,
172 .set_voltage_sel
= lp3971_ldo_set_voltage_sel
,
175 static int lp3971_dcdc_is_enabled(struct regulator_dev
*dev
)
177 struct lp3971
*lp3971
= rdev_get_drvdata(dev
);
178 int buck
= rdev_get_id(dev
) - LP3971_DCDC1
;
179 u16 mask
= 1 << (buck
* 2);
182 val
= lp3971_reg_read(lp3971
, LP3971_BUCK_VOL_ENABLE_REG
);
183 return (val
& mask
) != 0;
186 static int lp3971_dcdc_enable(struct regulator_dev
*dev
)
188 struct lp3971
*lp3971
= rdev_get_drvdata(dev
);
189 int buck
= rdev_get_id(dev
) - LP3971_DCDC1
;
190 u16 mask
= 1 << (buck
* 2);
192 return lp3971_set_bits(lp3971
, LP3971_BUCK_VOL_ENABLE_REG
, mask
, mask
);
195 static int lp3971_dcdc_disable(struct regulator_dev
*dev
)
197 struct lp3971
*lp3971
= rdev_get_drvdata(dev
);
198 int buck
= rdev_get_id(dev
) - LP3971_DCDC1
;
199 u16 mask
= 1 << (buck
* 2);
201 return lp3971_set_bits(lp3971
, LP3971_BUCK_VOL_ENABLE_REG
, mask
, 0);
204 static int lp3971_dcdc_get_voltage(struct regulator_dev
*dev
)
206 struct lp3971
*lp3971
= rdev_get_drvdata(dev
);
207 int buck
= rdev_get_id(dev
) - LP3971_DCDC1
;
211 reg
= lp3971_reg_read(lp3971
, LP3971_BUCK_TARGET_VOL1_REG(buck
));
212 reg
&= BUCK_TARGET_VOL_MASK
;
214 if (reg
<= BUCK_TARGET_VOL_MAX_IDX
)
215 val
= buck_voltage_map
[reg
];
218 dev_warn(&dev
->dev
, "chip reported incorrect voltage value.\n");
224 static int lp3971_dcdc_set_voltage_sel(struct regulator_dev
*dev
,
225 unsigned int selector
)
227 struct lp3971
*lp3971
= rdev_get_drvdata(dev
);
228 int buck
= rdev_get_id(dev
) - LP3971_DCDC1
;
231 ret
= lp3971_set_bits(lp3971
, LP3971_BUCK_TARGET_VOL1_REG(buck
),
232 BUCK_TARGET_VOL_MASK
, selector
);
236 ret
= lp3971_set_bits(lp3971
, LP3971_BUCK_VOL_CHANGE_REG
,
237 BUCK_VOL_CHANGE_FLAG_MASK
<< BUCK_VOL_CHANGE_SHIFT(buck
),
238 BUCK_VOL_CHANGE_FLAG_GO
<< BUCK_VOL_CHANGE_SHIFT(buck
));
242 return lp3971_set_bits(lp3971
, LP3971_BUCK_VOL_CHANGE_REG
,
243 BUCK_VOL_CHANGE_FLAG_MASK
<< BUCK_VOL_CHANGE_SHIFT(buck
),
244 0 << BUCK_VOL_CHANGE_SHIFT(buck
));
247 static struct regulator_ops lp3971_dcdc_ops
= {
248 .list_voltage
= regulator_list_voltage_table
,
249 .is_enabled
= lp3971_dcdc_is_enabled
,
250 .enable
= lp3971_dcdc_enable
,
251 .disable
= lp3971_dcdc_disable
,
252 .get_voltage
= lp3971_dcdc_get_voltage
,
253 .set_voltage_sel
= lp3971_dcdc_set_voltage_sel
,
256 static const struct regulator_desc regulators
[] = {
260 .ops
= &lp3971_ldo_ops
,
261 .n_voltages
= ARRAY_SIZE(ldo123_voltage_map
),
262 .volt_table
= ldo123_voltage_map
,
263 .type
= REGULATOR_VOLTAGE
,
264 .owner
= THIS_MODULE
,
269 .ops
= &lp3971_ldo_ops
,
270 .n_voltages
= ARRAY_SIZE(ldo123_voltage_map
),
271 .volt_table
= ldo123_voltage_map
,
272 .type
= REGULATOR_VOLTAGE
,
273 .owner
= THIS_MODULE
,
278 .ops
= &lp3971_ldo_ops
,
279 .n_voltages
= ARRAY_SIZE(ldo123_voltage_map
),
280 .volt_table
= ldo123_voltage_map
,
281 .type
= REGULATOR_VOLTAGE
,
282 .owner
= THIS_MODULE
,
287 .ops
= &lp3971_ldo_ops
,
288 .n_voltages
= ARRAY_SIZE(ldo45_voltage_map
),
289 .volt_table
= ldo45_voltage_map
,
290 .type
= REGULATOR_VOLTAGE
,
291 .owner
= THIS_MODULE
,
296 .ops
= &lp3971_ldo_ops
,
297 .n_voltages
= ARRAY_SIZE(ldo45_voltage_map
),
298 .volt_table
= ldo45_voltage_map
,
299 .type
= REGULATOR_VOLTAGE
,
300 .owner
= THIS_MODULE
,
305 .ops
= &lp3971_dcdc_ops
,
306 .n_voltages
= ARRAY_SIZE(buck_voltage_map
),
307 .volt_table
= buck_voltage_map
,
308 .type
= REGULATOR_VOLTAGE
,
309 .owner
= THIS_MODULE
,
314 .ops
= &lp3971_dcdc_ops
,
315 .n_voltages
= ARRAY_SIZE(buck_voltage_map
),
316 .volt_table
= buck_voltage_map
,
317 .type
= REGULATOR_VOLTAGE
,
318 .owner
= THIS_MODULE
,
323 .ops
= &lp3971_dcdc_ops
,
324 .n_voltages
= ARRAY_SIZE(buck_voltage_map
),
325 .volt_table
= buck_voltage_map
,
326 .type
= REGULATOR_VOLTAGE
,
327 .owner
= THIS_MODULE
,
331 static int lp3971_i2c_read(struct i2c_client
*i2c
, char reg
, int count
,
338 ret
= i2c_smbus_read_byte_data(i2c
, reg
);
346 static int lp3971_i2c_write(struct i2c_client
*i2c
, char reg
, int count
,
351 return i2c_smbus_write_byte_data(i2c
, reg
, *src
);
354 static u8
lp3971_reg_read(struct lp3971
*lp3971
, u8 reg
)
358 mutex_lock(&lp3971
->io_lock
);
360 lp3971_i2c_read(lp3971
->i2c
, reg
, 1, &val
);
362 dev_dbg(lp3971
->dev
, "reg read 0x%02x -> 0x%02x\n", (int)reg
,
365 mutex_unlock(&lp3971
->io_lock
);
370 static int lp3971_set_bits(struct lp3971
*lp3971
, u8 reg
, u16 mask
, u16 val
)
375 mutex_lock(&lp3971
->io_lock
);
377 ret
= lp3971_i2c_read(lp3971
->i2c
, reg
, 1, &tmp
);
378 tmp
= (tmp
& ~mask
) | val
;
380 ret
= lp3971_i2c_write(lp3971
->i2c
, reg
, 1, &tmp
);
381 dev_dbg(lp3971
->dev
, "reg write 0x%02x -> 0x%02x\n", (int)reg
,
384 mutex_unlock(&lp3971
->io_lock
);
389 static int setup_regulators(struct lp3971
*lp3971
,
390 struct lp3971_platform_data
*pdata
)
394 lp3971
->num_regulators
= pdata
->num_regulators
;
395 lp3971
->rdev
= kcalloc(pdata
->num_regulators
,
396 sizeof(struct regulator_dev
*), GFP_KERNEL
);
402 /* Instantiate the regulators */
403 for (i
= 0; i
< pdata
->num_regulators
; i
++) {
404 struct regulator_config config
= { };
405 struct lp3971_regulator_subdev
*reg
= &pdata
->regulators
[i
];
407 config
.dev
= lp3971
->dev
;
408 config
.init_data
= reg
->initdata
;
409 config
.driver_data
= lp3971
;
411 lp3971
->rdev
[i
] = regulator_register(®ulators
[reg
->id
],
413 if (IS_ERR(lp3971
->rdev
[i
])) {
414 err
= PTR_ERR(lp3971
->rdev
[i
]);
415 dev_err(lp3971
->dev
, "regulator init failed: %d\n",
425 regulator_unregister(lp3971
->rdev
[i
]);
432 static int lp3971_i2c_probe(struct i2c_client
*i2c
,
433 const struct i2c_device_id
*id
)
435 struct lp3971
*lp3971
;
436 struct lp3971_platform_data
*pdata
= i2c
->dev
.platform_data
;
441 dev_dbg(&i2c
->dev
, "No platform init data supplied\n");
445 lp3971
= kzalloc(sizeof(struct lp3971
), GFP_KERNEL
);
450 lp3971
->dev
= &i2c
->dev
;
452 mutex_init(&lp3971
->io_lock
);
455 ret
= lp3971_i2c_read(i2c
, LP3971_SYS_CONTROL1_REG
, 1, &val
);
456 if (ret
== 0 && (val
& SYS_CONTROL1_INIT_MASK
) != SYS_CONTROL1_INIT_VAL
)
459 dev_err(&i2c
->dev
, "failed to detect device\n");
463 ret
= setup_regulators(lp3971
, pdata
);
467 i2c_set_clientdata(i2c
, lp3971
);
475 static int lp3971_i2c_remove(struct i2c_client
*i2c
)
477 struct lp3971
*lp3971
= i2c_get_clientdata(i2c
);
480 for (i
= 0; i
< lp3971
->num_regulators
; i
++)
481 regulator_unregister(lp3971
->rdev
[i
]);
489 static const struct i2c_device_id lp3971_i2c_id
[] = {
493 MODULE_DEVICE_TABLE(i2c
, lp3971_i2c_id
);
495 static struct i2c_driver lp3971_i2c_driver
= {
498 .owner
= THIS_MODULE
,
500 .probe
= lp3971_i2c_probe
,
501 .remove
= lp3971_i2c_remove
,
502 .id_table
= lp3971_i2c_id
,
505 module_i2c_driver(lp3971_i2c_driver
);
507 MODULE_LICENSE("GPL");
508 MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
509 MODULE_DESCRIPTION("LP3971 PMIC driver");