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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 | |
24 | struct 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 | |
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); |
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 | |
59 | static 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 | |
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, |
72 | 3000000, 3300000, |
73 | }; |
74 | |
75 | #define BUCK_TARGET_VOL_MASK 0x3f |
76 | |
77 | #define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2) |
78 | |
79 | #define LP3971_LDO_ENABLE_REG 0x12 |
80 | #define LP3971_LDO_VOL_CONTR_BASE 0x39 |
81 | |
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 |
88 | */ |
89 | #define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1)) |
90 | |
91 | /* Voltage control registers shift: |
92 | LP3971_LDO1 -> 0, LP3971_LDO2 -> 4 |
93 | LP3971_LDO3 -> 0, LP3971_LDO4 -> 4 |
94 | LP3971_LDO5 -> 0 |
95 | */ |
96 | #define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2) |
97 | #define LDO_VOL_CONTR_MASK 0x0f |
98 | |
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, |
102 | }; |
103 | |
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, |
107 | }; |
108 | |
109 | #define LDO_VOL_MIN_IDX 0x00 |
110 | #define LDO_VOL_MAX_IDX 0x0f |
111 | |
112 | static int lp3971_ldo_is_enabled(struct regulator_dev *dev) |
113 | { |
114 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
115 | int ldo = rdev_get_id(dev) - LP3971_LDO1; |
116 | u16 mask = 1 << (1 + ldo); |
117 | u16 val; |
118 | |
119 | val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG); |
120 | return (val & mask) != 0; |
121 | } |
122 | |
123 | static int lp3971_ldo_enable(struct regulator_dev *dev) |
124 | { |
125 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
126 | int ldo = rdev_get_id(dev) - LP3971_LDO1; |
127 | u16 mask = 1 << (1 + ldo); |
128 | |
129 | return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask); |
130 | } |
131 | |
132 | static int lp3971_ldo_disable(struct regulator_dev *dev) |
133 | { |
134 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
135 | int ldo = rdev_get_id(dev) - LP3971_LDO1; |
136 | u16 mask = 1 << (1 + ldo); |
137 | |
138 | return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0); |
139 | } |
140 | |
141 | static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev) |
142 | { |
143 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
144 | int ldo = rdev_get_id(dev) - LP3971_LDO1; |
145 | u16 val, reg; |
146 | |
147 | reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo)); |
148 | val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK; |
149 | |
150 | return val; |
151 | } |
152 | |
153 | static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev, |
154 | unsigned int selector) |
155 | { |
156 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
157 | int ldo = rdev_get_id(dev) - LP3971_LDO1; |
158 | |
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)); |
162 | } |
163 | |
164 | static struct regulator_ops lp3971_ldo_ops = { |
165 | .list_voltage = regulator_list_voltage_table, |
166 | .is_enabled = lp3971_ldo_is_enabled, |
167 | .enable = lp3971_ldo_enable, |
168 | .disable = lp3971_ldo_disable, |
169 | .get_voltage_sel = lp3971_ldo_get_voltage_sel, |
170 | .set_voltage_sel = lp3971_ldo_set_voltage_sel, |
171 | }; |
172 | |
173 | static int lp3971_dcdc_is_enabled(struct regulator_dev *dev) |
174 | { |
175 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
176 | int buck = rdev_get_id(dev) - LP3971_DCDC1; |
177 | u16 mask = 1 << (buck * 2); |
178 | u16 val; |
179 | |
180 | val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG); |
181 | return (val & mask) != 0; |
182 | } |
183 | |
184 | static int lp3971_dcdc_enable(struct regulator_dev *dev) |
185 | { |
186 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
187 | int buck = rdev_get_id(dev) - LP3971_DCDC1; |
188 | u16 mask = 1 << (buck * 2); |
189 | |
190 | return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask); |
191 | } |
192 | |
193 | static int lp3971_dcdc_disable(struct regulator_dev *dev) |
194 | { |
195 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
196 | int buck = rdev_get_id(dev) - LP3971_DCDC1; |
197 | u16 mask = 1 << (buck * 2); |
198 | |
199 | return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0); |
200 | } |
201 | |
202 | static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev) |
203 | { |
204 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
205 | int buck = rdev_get_id(dev) - LP3971_DCDC1; |
206 | u16 reg; |
207 | |
208 | reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck)); |
209 | reg &= BUCK_TARGET_VOL_MASK; |
210 | |
211 | return reg; |
212 | } |
213 | |
214 | static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev, |
215 | unsigned int selector) |
216 | { |
217 | struct lp3971 *lp3971 = rdev_get_drvdata(dev); |
218 | int buck = rdev_get_id(dev) - LP3971_DCDC1; |
219 | int ret; |
220 | |
221 | ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck), |
222 | BUCK_TARGET_VOL_MASK, selector); |
223 | if (ret) |
224 | return ret; |
225 | |
226 | ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG, |
227 | BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck), |
228 | BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck)); |
229 | if (ret) |
230 | return ret; |
231 | |
232 | return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG, |
233 | BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck), |
234 | 0 << BUCK_VOL_CHANGE_SHIFT(buck)); |
235 | } |
236 | |
237 | static struct regulator_ops lp3971_dcdc_ops = { |
238 | .list_voltage = regulator_list_voltage_table, |
239 | .is_enabled = lp3971_dcdc_is_enabled, |
240 | .enable = lp3971_dcdc_enable, |
241 | .disable = lp3971_dcdc_disable, |
242 | .get_voltage_sel = lp3971_dcdc_get_voltage_sel, |
243 | .set_voltage_sel = lp3971_dcdc_set_voltage_sel, |
244 | }; |
245 | |
246 | static const struct regulator_desc regulators[] = { |
247 | { |
248 | .name = "LDO1", |
249 | .id = LP3971_LDO1, |
250 | .ops = &lp3971_ldo_ops, |
251 | .n_voltages = ARRAY_SIZE(ldo123_voltage_map), |
252 | .volt_table = ldo123_voltage_map, |
253 | .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), |
261 | .volt_table = ldo123_voltage_map, |
262 | .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), |
270 | .volt_table = ldo123_voltage_map, |
271 | .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), |
279 | .volt_table = ldo45_voltage_map, |
280 | .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), |
288 | .volt_table = ldo45_voltage_map, |
289 | .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), |
297 | .volt_table = buck_voltage_map, |
298 | .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), |
306 | .volt_table = buck_voltage_map, |
307 | .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), |
315 | .volt_table = buck_voltage_map, |
316 | .type = REGULATOR_VOLTAGE, |
317 | .owner = THIS_MODULE, |
318 | }, |
319 | }; |
320 | |
321 | static 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); |
329 | if (ret < 0) |
330 | return -EIO; |
331 | |
332 | *dest = ret; |
333 | return 0; |
334 | } |
335 | |
336 | static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count, |
337 | const u16 *src) |
338 | { |
339 | if (count != 1) |
340 | return -EIO; |
341 | return i2c_smbus_write_byte_data(i2c, reg, *src); |
342 | } |
343 | |
344 | static 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 | |
360 | static 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 | |
379 | static int setup_regulators(struct lp3971 *lp3971, |
380 | struct lp3971_platform_data *pdata) |
381 | { |
382 | int i, err; |
383 | |
384 | lp3971->num_regulators = pdata->num_regulators; |
385 | lp3971->rdev = kcalloc(pdata->num_regulators, |
386 | sizeof(struct regulator_dev *), GFP_KERNEL); |
387 | if (!lp3971->rdev) { |
388 | err = -ENOMEM; |
389 | goto err_nomem; |
390 | } |
391 | |
392 | /* Instantiate the regulators */ |
393 | for (i = 0; i < pdata->num_regulators; i++) { |
394 | struct regulator_config config = { }; |
395 | struct lp3971_regulator_subdev *reg = &pdata->regulators[i]; |
396 | |
397 | config.dev = lp3971->dev; |
398 | config.init_data = reg->initdata; |
399 | config.driver_data = lp3971; |
400 | |
401 | lp3971->rdev[i] = regulator_register(®ulators[reg->id], |
402 | &config); |
403 | if (IS_ERR(lp3971->rdev[i])) { |
404 | err = PTR_ERR(lp3971->rdev[i]); |
405 | dev_err(lp3971->dev, "regulator init failed: %d\n", |
406 | err); |
407 | goto error; |
408 | } |
409 | } |
410 | |
411 | return 0; |
412 | |
413 | error: |
414 | while (--i >= 0) |
415 | regulator_unregister(lp3971->rdev[i]); |
416 | kfree(lp3971->rdev); |
417 | lp3971->rdev = NULL; |
418 | err_nomem: |
419 | return err; |
420 | } |
421 | |
422 | static int lp3971_i2c_probe(struct i2c_client *i2c, |
423 | const struct i2c_device_id *id) |
424 | { |
425 | struct lp3971 *lp3971; |
426 | struct lp3971_platform_data *pdata = i2c->dev.platform_data; |
427 | int ret; |
428 | u16 val; |
429 | |
430 | if (!pdata) { |
431 | dev_dbg(&i2c->dev, "No platform init data supplied\n"); |
432 | return -ENODEV; |
433 | } |
434 | |
435 | lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL); |
436 | if (lp3971 == NULL) |
437 | return -ENOMEM; |
438 | |
439 | lp3971->i2c = i2c; |
440 | lp3971->dev = &i2c->dev; |
441 | |
442 | mutex_init(&lp3971->io_lock); |
443 | |
444 | /* Detect LP3971 */ |
445 | ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val); |
446 | if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL) |
447 | ret = -ENODEV; |
448 | if (ret < 0) { |
449 | dev_err(&i2c->dev, "failed to detect device\n"); |
450 | goto err_detect; |
451 | } |
452 | |
453 | ret = setup_regulators(lp3971, pdata); |
454 | if (ret < 0) |
455 | goto err_detect; |
456 | |
457 | i2c_set_clientdata(i2c, lp3971); |
458 | return 0; |
459 | |
460 | err_detect: |
461 | kfree(lp3971); |
462 | return ret; |
463 | } |
464 | |
465 | static int lp3971_i2c_remove(struct i2c_client *i2c) |
466 | { |
467 | struct lp3971 *lp3971 = i2c_get_clientdata(i2c); |
468 | int i; |
469 | |
470 | for (i = 0; i < lp3971->num_regulators; i++) |
471 | regulator_unregister(lp3971->rdev[i]); |
472 | |
473 | kfree(lp3971->rdev); |
474 | kfree(lp3971); |
475 | |
476 | return 0; |
477 | } |
478 | |
479 | static const struct i2c_device_id lp3971_i2c_id[] = { |
480 | { "lp3971", 0 }, |
481 | { } |
482 | }; |
483 | MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id); |
484 | |
485 | static struct i2c_driver lp3971_i2c_driver = { |
486 | .driver = { |
487 | .name = "LP3971", |
488 | .owner = THIS_MODULE, |
489 | }, |
490 | .probe = lp3971_i2c_probe, |
491 | .remove = lp3971_i2c_remove, |
492 | .id_table = lp3971_i2c_id, |
493 | }; |
494 | |
495 | module_i2c_driver(lp3971_i2c_driver); |
496 | |
497 | MODULE_LICENSE("GPL"); |
498 | MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>"); |
499 | MODULE_DESCRIPTION("LP3971 PMIC driver"); |
500 |
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