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0cbdf7bc MS |
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/regulator/driver.h> | |
20 | #include <linux/regulator/lp3971.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
0cbdf7bc MS |
22 | |
23 | struct lp3971 { | |
24 | struct device *dev; | |
25 | struct mutex io_lock; | |
26 | struct i2c_client *i2c; | |
27 | int num_regulators; | |
28 | struct regulator_dev **rdev; | |
29 | }; | |
30 | ||
31 | static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg); | |
32 | static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val); | |
33 | ||
34 | #define LP3971_SYS_CONTROL1_REG 0x07 | |
35 | ||
36 | /* System control register 1 initial value, | |
37 | bits 4 and 5 are EPROM programmable */ | |
38 | #define SYS_CONTROL1_INIT_VAL 0x40 | |
39 | #define SYS_CONTROL1_INIT_MASK 0xCF | |
40 | ||
41 | #define LP3971_BUCK_VOL_ENABLE_REG 0x10 | |
42 | #define LP3971_BUCK_VOL_CHANGE_REG 0x20 | |
43 | ||
44 | /* Voltage control registers shift: | |
45 | LP3971_BUCK1 -> 0 | |
46 | LP3971_BUCK2 -> 4 | |
47 | LP3971_BUCK3 -> 6 | |
48 | */ | |
451a73cd | 49 | #define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01)) |
0cbdf7bc MS |
50 | #define BUCK_VOL_CHANGE_FLAG_GO 0x01 |
51 | #define BUCK_VOL_CHANGE_FLAG_TARGET 0x02 | |
52 | #define BUCK_VOL_CHANGE_FLAG_MASK 0x03 | |
53 | ||
54 | #define LP3971_BUCK1_BASE 0x23 | |
55 | #define LP3971_BUCK2_BASE 0x29 | |
56 | #define LP3971_BUCK3_BASE 0x32 | |
57 | ||
6faa7e0a | 58 | static const int buck_base_addr[] = { |
0cbdf7bc MS |
59 | LP3971_BUCK1_BASE, |
60 | LP3971_BUCK2_BASE, | |
61 | LP3971_BUCK3_BASE, | |
62 | }; | |
63 | ||
64 | #define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x]) | |
65 | #define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1) | |
66 | ||
6faa7e0a | 67 | static const int buck_voltage_map[] = { |
0cbdf7bc MS |
68 | 0, 800, 850, 900, 950, 1000, 1050, 1100, |
69 | 1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500, | |
70 | 1550, 1600, 1650, 1700, 1800, 1900, 2500, 2800, | |
71 | 3000, 3300, | |
72 | }; | |
73 | ||
74 | #define BUCK_TARGET_VOL_MASK 0x3f | |
75 | #define BUCK_TARGET_VOL_MIN_IDX 0x01 | |
76 | #define BUCK_TARGET_VOL_MAX_IDX 0x19 | |
77 | ||
78 | #define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2) | |
79 | ||
80 | #define LP3971_LDO_ENABLE_REG 0x12 | |
81 | #define LP3971_LDO_VOL_CONTR_BASE 0x39 | |
82 | ||
83 | /* Voltage control registers: | |
84 | LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0 | |
85 | LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0 | |
86 | LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1 | |
87 | LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1 | |
88 | LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2 | |
89 | */ | |
90 | #define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1)) | |
91 | ||
92 | /* Voltage control registers shift: | |
93 | LP3971_LDO1 -> 0, LP3971_LDO2 -> 4 | |
94 | LP3971_LDO3 -> 0, LP3971_LDO4 -> 4 | |
95 | LP3971_LDO5 -> 0 | |
96 | */ | |
97 | #define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2) | |
98 | #define LDO_VOL_CONTR_MASK 0x0f | |
99 | ||
6faa7e0a | 100 | static const int ldo45_voltage_map[] = { |
0cbdf7bc MS |
101 | 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350, |
102 | 1400, 1500, 1800, 1900, 2500, 2800, 3000, 3300, | |
103 | }; | |
104 | ||
6faa7e0a | 105 | static const int ldo123_voltage_map[] = { |
0cbdf7bc MS |
106 | 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, |
107 | 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300, | |
108 | }; | |
109 | ||
6faa7e0a | 110 | static const int *ldo_voltage_map[] = { |
0cbdf7bc MS |
111 | ldo123_voltage_map, /* LDO1 */ |
112 | ldo123_voltage_map, /* LDO2 */ | |
113 | ldo123_voltage_map, /* LDO3 */ | |
114 | ldo45_voltage_map, /* LDO4 */ | |
115 | ldo45_voltage_map, /* LDO5 */ | |
116 | }; | |
117 | ||
118 | #define LDO_VOL_VALUE_MAP(x) (ldo_voltage_map[(x - LP3971_LDO1)]) | |
119 | ||
120 | #define LDO_VOL_MIN_IDX 0x00 | |
121 | #define LDO_VOL_MAX_IDX 0x0f | |
122 | ||
123 | static int lp3971_ldo_list_voltage(struct regulator_dev *dev, unsigned index) | |
124 | { | |
125 | int ldo = rdev_get_id(dev) - LP3971_LDO1; | |
126 | return 1000 * LDO_VOL_VALUE_MAP(ldo)[index]; | |
127 | } | |
128 | ||
129 | static int lp3971_ldo_is_enabled(struct regulator_dev *dev) | |
130 | { | |
131 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); | |
132 | int ldo = rdev_get_id(dev) - LP3971_LDO1; | |
133 | u16 mask = 1 << (1 + ldo); | |
134 | u16 val; | |
135 | ||
136 | val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG); | |
137 | return (val & mask) != 0; | |
138 | } | |
139 | ||
140 | static int lp3971_ldo_enable(struct regulator_dev *dev) | |
141 | { | |
142 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); | |
143 | int ldo = rdev_get_id(dev) - LP3971_LDO1; | |
144 | u16 mask = 1 << (1 + ldo); | |
145 | ||
146 | return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask); | |
147 | } | |
148 | ||
149 | static int lp3971_ldo_disable(struct regulator_dev *dev) | |
150 | { | |
151 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); | |
152 | int ldo = rdev_get_id(dev) - LP3971_LDO1; | |
153 | u16 mask = 1 << (1 + ldo); | |
154 | ||
155 | return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0); | |
156 | } | |
157 | ||
158 | static int lp3971_ldo_get_voltage(struct regulator_dev *dev) | |
159 | { | |
160 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); | |
161 | int ldo = rdev_get_id(dev) - LP3971_LDO1; | |
162 | u16 val, reg; | |
163 | ||
164 | reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo)); | |
165 | val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK; | |
166 | ||
167 | return 1000 * LDO_VOL_VALUE_MAP(ldo)[val]; | |
168 | } | |
169 | ||
170 | static int lp3971_ldo_set_voltage(struct regulator_dev *dev, | |
171 | int min_uV, int max_uV) | |
172 | { | |
173 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); | |
174 | int ldo = rdev_get_id(dev) - LP3971_LDO1; | |
175 | int min_vol = min_uV / 1000, max_vol = max_uV / 1000; | |
176 | const int *vol_map = LDO_VOL_VALUE_MAP(ldo); | |
177 | u16 val; | |
178 | ||
179 | if (min_vol < vol_map[LDO_VOL_MIN_IDX] || | |
180 | min_vol > vol_map[LDO_VOL_MAX_IDX]) | |
181 | return -EINVAL; | |
182 | ||
183 | for (val = LDO_VOL_MIN_IDX; val <= LDO_VOL_MAX_IDX; val++) | |
184 | if (vol_map[val] >= min_vol) | |
185 | break; | |
186 | ||
62737d44 | 187 | if (val > LDO_VOL_MAX_IDX || vol_map[val] > max_vol) |
0cbdf7bc MS |
188 | return -EINVAL; |
189 | ||
190 | return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo), | |
cdb868f5 AL |
191 | LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo), |
192 | val << LDO_VOL_CONTR_SHIFT(ldo)); | |
0cbdf7bc MS |
193 | } |
194 | ||
195 | static struct regulator_ops lp3971_ldo_ops = { | |
196 | .list_voltage = lp3971_ldo_list_voltage, | |
197 | .is_enabled = lp3971_ldo_is_enabled, | |
198 | .enable = lp3971_ldo_enable, | |
199 | .disable = lp3971_ldo_disable, | |
200 | .get_voltage = lp3971_ldo_get_voltage, | |
201 | .set_voltage = lp3971_ldo_set_voltage, | |
202 | }; | |
203 | ||
204 | static int lp3971_dcdc_list_voltage(struct regulator_dev *dev, unsigned index) | |
205 | { | |
206 | return 1000 * buck_voltage_map[index]; | |
207 | } | |
208 | ||
209 | static int lp3971_dcdc_is_enabled(struct regulator_dev *dev) | |
210 | { | |
211 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); | |
212 | int buck = rdev_get_id(dev) - LP3971_DCDC1; | |
213 | u16 mask = 1 << (buck * 2); | |
214 | u16 val; | |
215 | ||
216 | val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG); | |
217 | return (val & mask) != 0; | |
218 | } | |
219 | ||
220 | static int lp3971_dcdc_enable(struct regulator_dev *dev) | |
221 | { | |
222 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); | |
223 | int buck = rdev_get_id(dev) - LP3971_DCDC1; | |
224 | u16 mask = 1 << (buck * 2); | |
225 | ||
226 | return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask); | |
227 | } | |
228 | ||
229 | static int lp3971_dcdc_disable(struct regulator_dev *dev) | |
230 | { | |
231 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); | |
232 | int buck = rdev_get_id(dev) - LP3971_DCDC1; | |
233 | u16 mask = 1 << (buck * 2); | |
234 | ||
235 | return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0); | |
236 | } | |
237 | ||
238 | static int lp3971_dcdc_get_voltage(struct regulator_dev *dev) | |
239 | { | |
240 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); | |
241 | int buck = rdev_get_id(dev) - LP3971_DCDC1; | |
242 | u16 reg; | |
243 | int val; | |
244 | ||
245 | reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck)); | |
246 | reg &= BUCK_TARGET_VOL_MASK; | |
247 | ||
248 | if (reg <= BUCK_TARGET_VOL_MAX_IDX) | |
249 | val = 1000 * buck_voltage_map[reg]; | |
250 | else { | |
251 | val = 0; | |
252 | dev_warn(&dev->dev, "chip reported incorrect voltage value.\n"); | |
253 | } | |
254 | ||
255 | return val; | |
256 | } | |
257 | ||
258 | static int lp3971_dcdc_set_voltage(struct regulator_dev *dev, | |
259 | int min_uV, int max_uV) | |
260 | { | |
261 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); | |
262 | int buck = rdev_get_id(dev) - LP3971_DCDC1; | |
263 | int min_vol = min_uV / 1000, max_vol = max_uV / 1000; | |
264 | const int *vol_map = buck_voltage_map; | |
265 | u16 val; | |
266 | int ret; | |
267 | ||
268 | if (min_vol < vol_map[BUCK_TARGET_VOL_MIN_IDX] || | |
269 | min_vol > vol_map[BUCK_TARGET_VOL_MAX_IDX]) | |
270 | return -EINVAL; | |
271 | ||
272 | for (val = BUCK_TARGET_VOL_MIN_IDX; val <= BUCK_TARGET_VOL_MAX_IDX; | |
273 | val++) | |
274 | if (vol_map[val] >= min_vol) | |
275 | break; | |
276 | ||
62737d44 | 277 | if (val > BUCK_TARGET_VOL_MAX_IDX || vol_map[val] > max_vol) |
0cbdf7bc MS |
278 | return -EINVAL; |
279 | ||
280 | ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck), | |
281 | BUCK_TARGET_VOL_MASK, val); | |
282 | if (ret) | |
283 | return ret; | |
284 | ||
285 | ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG, | |
286 | BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck), | |
287 | BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck)); | |
288 | if (ret) | |
289 | return ret; | |
290 | ||
291 | return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG, | |
292 | BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck), | |
293 | 0 << BUCK_VOL_CHANGE_SHIFT(buck)); | |
294 | } | |
295 | ||
296 | static struct regulator_ops lp3971_dcdc_ops = { | |
297 | .list_voltage = lp3971_dcdc_list_voltage, | |
298 | .is_enabled = lp3971_dcdc_is_enabled, | |
299 | .enable = lp3971_dcdc_enable, | |
300 | .disable = lp3971_dcdc_disable, | |
301 | .get_voltage = lp3971_dcdc_get_voltage, | |
302 | .set_voltage = lp3971_dcdc_set_voltage, | |
303 | }; | |
304 | ||
305 | static struct regulator_desc regulators[] = { | |
306 | { | |
307 | .name = "LDO1", | |
308 | .id = LP3971_LDO1, | |
309 | .ops = &lp3971_ldo_ops, | |
310 | .n_voltages = ARRAY_SIZE(ldo123_voltage_map), | |
311 | .type = REGULATOR_VOLTAGE, | |
312 | .owner = THIS_MODULE, | |
313 | }, | |
314 | { | |
315 | .name = "LDO2", | |
316 | .id = LP3971_LDO2, | |
317 | .ops = &lp3971_ldo_ops, | |
318 | .n_voltages = ARRAY_SIZE(ldo123_voltage_map), | |
319 | .type = REGULATOR_VOLTAGE, | |
320 | .owner = THIS_MODULE, | |
321 | }, | |
322 | { | |
323 | .name = "LDO3", | |
324 | .id = LP3971_LDO3, | |
325 | .ops = &lp3971_ldo_ops, | |
326 | .n_voltages = ARRAY_SIZE(ldo123_voltage_map), | |
327 | .type = REGULATOR_VOLTAGE, | |
328 | .owner = THIS_MODULE, | |
329 | }, | |
330 | { | |
331 | .name = "LDO4", | |
332 | .id = LP3971_LDO4, | |
333 | .ops = &lp3971_ldo_ops, | |
334 | .n_voltages = ARRAY_SIZE(ldo45_voltage_map), | |
335 | .type = REGULATOR_VOLTAGE, | |
336 | .owner = THIS_MODULE, | |
337 | }, | |
338 | { | |
339 | .name = "LDO5", | |
340 | .id = LP3971_LDO5, | |
341 | .ops = &lp3971_ldo_ops, | |
342 | .n_voltages = ARRAY_SIZE(ldo45_voltage_map), | |
343 | .type = REGULATOR_VOLTAGE, | |
344 | .owner = THIS_MODULE, | |
345 | }, | |
346 | { | |
347 | .name = "DCDC1", | |
348 | .id = LP3971_DCDC1, | |
349 | .ops = &lp3971_dcdc_ops, | |
350 | .n_voltages = ARRAY_SIZE(buck_voltage_map), | |
351 | .type = REGULATOR_VOLTAGE, | |
352 | .owner = THIS_MODULE, | |
353 | }, | |
354 | { | |
355 | .name = "DCDC2", | |
356 | .id = LP3971_DCDC2, | |
357 | .ops = &lp3971_dcdc_ops, | |
358 | .n_voltages = ARRAY_SIZE(buck_voltage_map), | |
359 | .type = REGULATOR_VOLTAGE, | |
360 | .owner = THIS_MODULE, | |
361 | }, | |
362 | { | |
363 | .name = "DCDC3", | |
364 | .id = LP3971_DCDC3, | |
365 | .ops = &lp3971_dcdc_ops, | |
366 | .n_voltages = ARRAY_SIZE(buck_voltage_map), | |
367 | .type = REGULATOR_VOLTAGE, | |
368 | .owner = THIS_MODULE, | |
369 | }, | |
370 | }; | |
371 | ||
372 | static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count, | |
373 | u16 *dest) | |
374 | { | |
375 | int ret; | |
376 | ||
377 | if (count != 1) | |
378 | return -EIO; | |
379 | ret = i2c_smbus_read_byte_data(i2c, reg); | |
27ef7f00 | 380 | if (ret < 0) |
0cbdf7bc MS |
381 | return -EIO; |
382 | ||
383 | *dest = ret; | |
384 | return 0; | |
385 | } | |
386 | ||
387 | static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count, | |
388 | const u16 *src) | |
389 | { | |
390 | int ret; | |
391 | ||
392 | if (count != 1) | |
393 | return -EIO; | |
394 | ret = i2c_smbus_write_byte_data(i2c, reg, *src); | |
395 | if (ret >= 0) | |
396 | return 0; | |
397 | ||
398 | return ret; | |
399 | } | |
400 | ||
401 | static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg) | |
402 | { | |
403 | u16 val = 0; | |
404 | ||
405 | mutex_lock(&lp3971->io_lock); | |
406 | ||
407 | lp3971_i2c_read(lp3971->i2c, reg, 1, &val); | |
408 | ||
409 | dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg, | |
410 | (unsigned)val&0xff); | |
411 | ||
412 | mutex_unlock(&lp3971->io_lock); | |
413 | ||
414 | return val & 0xff; | |
415 | } | |
416 | ||
417 | static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val) | |
418 | { | |
419 | u16 tmp; | |
420 | int ret; | |
421 | ||
422 | mutex_lock(&lp3971->io_lock); | |
423 | ||
424 | ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp); | |
425 | tmp = (tmp & ~mask) | val; | |
426 | if (ret == 0) { | |
427 | ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp); | |
428 | dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg, | |
429 | (unsigned)val&0xff); | |
430 | } | |
431 | mutex_unlock(&lp3971->io_lock); | |
432 | ||
433 | return ret; | |
434 | } | |
435 | ||
ebbed04f DT |
436 | static int __devinit setup_regulators(struct lp3971 *lp3971, |
437 | struct lp3971_platform_data *pdata) | |
0cbdf7bc MS |
438 | { |
439 | int i, err; | |
ebbed04f DT |
440 | |
441 | lp3971->num_regulators = pdata->num_regulators; | |
442 | lp3971->rdev = kcalloc(pdata->num_regulators, | |
443 | sizeof(struct regulator_dev *), GFP_KERNEL); | |
67e46f34 DC |
444 | if (!lp3971->rdev) { |
445 | err = -ENOMEM; | |
446 | goto err_nomem; | |
447 | } | |
0cbdf7bc MS |
448 | |
449 | /* Instantiate the regulators */ | |
ebbed04f DT |
450 | for (i = 0; i < pdata->num_regulators; i++) { |
451 | struct lp3971_regulator_subdev *reg = &pdata->regulators[i]; | |
452 | lp3971->rdev[i] = regulator_register(®ulators[reg->id], | |
453 | lp3971->dev, reg->initdata, lp3971); | |
0cbdf7bc | 454 | |
d662fc82 JL |
455 | if (IS_ERR(lp3971->rdev[i])) { |
456 | err = PTR_ERR(lp3971->rdev[i]); | |
0cbdf7bc MS |
457 | dev_err(lp3971->dev, "regulator init failed: %d\n", |
458 | err); | |
459 | goto error; | |
460 | } | |
461 | } | |
462 | ||
463 | return 0; | |
ebbed04f | 464 | |
0cbdf7bc | 465 | error: |
ebbed04f DT |
466 | while (--i >= 0) |
467 | regulator_unregister(lp3971->rdev[i]); | |
0cbdf7bc MS |
468 | kfree(lp3971->rdev); |
469 | lp3971->rdev = NULL; | |
67e46f34 | 470 | err_nomem: |
0cbdf7bc MS |
471 | return err; |
472 | } | |
473 | ||
474 | static int __devinit lp3971_i2c_probe(struct i2c_client *i2c, | |
475 | const struct i2c_device_id *id) | |
476 | { | |
477 | struct lp3971 *lp3971; | |
478 | struct lp3971_platform_data *pdata = i2c->dev.platform_data; | |
479 | int ret; | |
480 | u16 val; | |
481 | ||
ebbed04f DT |
482 | if (!pdata) { |
483 | dev_dbg(&i2c->dev, "No platform init data supplied\n"); | |
484 | return -ENODEV; | |
0cbdf7bc MS |
485 | } |
486 | ||
ebbed04f DT |
487 | lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL); |
488 | if (lp3971 == NULL) | |
489 | return -ENOMEM; | |
490 | ||
0cbdf7bc MS |
491 | lp3971->i2c = i2c; |
492 | lp3971->dev = &i2c->dev; | |
0cbdf7bc MS |
493 | |
494 | mutex_init(&lp3971->io_lock); | |
495 | ||
496 | /* Detect LP3971 */ | |
497 | ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val); | |
498 | if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL) | |
499 | ret = -ENODEV; | |
500 | if (ret < 0) { | |
501 | dev_err(&i2c->dev, "failed to detect device\n"); | |
502 | goto err_detect; | |
503 | } | |
504 | ||
ebbed04f DT |
505 | ret = setup_regulators(lp3971, pdata); |
506 | if (ret < 0) | |
507 | goto err_detect; | |
0cbdf7bc | 508 | |
ebbed04f | 509 | i2c_set_clientdata(i2c, lp3971); |
0cbdf7bc MS |
510 | return 0; |
511 | ||
512 | err_detect: | |
0cbdf7bc | 513 | kfree(lp3971); |
0cbdf7bc MS |
514 | return ret; |
515 | } | |
516 | ||
517 | static int __devexit lp3971_i2c_remove(struct i2c_client *i2c) | |
518 | { | |
519 | struct lp3971 *lp3971 = i2c_get_clientdata(i2c); | |
520 | int i; | |
ebbed04f | 521 | |
0cbdf7bc | 522 | for (i = 0; i < lp3971->num_regulators; i++) |
ebbed04f DT |
523 | regulator_unregister(lp3971->rdev[i]); |
524 | ||
0cbdf7bc | 525 | kfree(lp3971->rdev); |
0cbdf7bc MS |
526 | kfree(lp3971); |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
531 | static const struct i2c_device_id lp3971_i2c_id[] = { | |
532 | { "lp3971", 0 }, | |
533 | { } | |
534 | }; | |
535 | MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id); | |
536 | ||
537 | static struct i2c_driver lp3971_i2c_driver = { | |
538 | .driver = { | |
539 | .name = "LP3971", | |
540 | .owner = THIS_MODULE, | |
541 | }, | |
542 | .probe = lp3971_i2c_probe, | |
6113c3a5 | 543 | .remove = __devexit_p(lp3971_i2c_remove), |
0cbdf7bc MS |
544 | .id_table = lp3971_i2c_id, |
545 | }; | |
546 | ||
547 | static int __init lp3971_module_init(void) | |
548 | { | |
12a1d933 | 549 | int ret; |
0cbdf7bc MS |
550 | |
551 | ret = i2c_add_driver(&lp3971_i2c_driver); | |
552 | if (ret != 0) | |
553 | pr_err("Failed to register I2C driver: %d\n", ret); | |
554 | ||
555 | return ret; | |
556 | } | |
557 | module_init(lp3971_module_init); | |
558 | ||
559 | static void __exit lp3971_module_exit(void) | |
560 | { | |
561 | i2c_del_driver(&lp3971_i2c_driver); | |
562 | } | |
563 | module_exit(lp3971_module_exit); | |
564 | ||
565 | MODULE_LICENSE("GPL"); | |
566 | MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>"); | |
567 | MODULE_DESCRIPTION("LP3971 PMIC driver"); |