tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * tps65023-regulator.c
3 *
4 * Supports TPS65023 Regulator
5 *
6 * Copyright (C) 2009 Texas Instrument Incorporated - http://www.ti.com/
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation version 2.
11 *
12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
13 * whether express or implied; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 */
17
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/init.h>
21#include <linux/err.h>
22#include <linux/platform_device.h>
23#include <linux/regulator/driver.h>
24#include <linux/regulator/machine.h>
25#include <linux/i2c.h>
26#include <linux/delay.h>
27
28/* Register definitions */
29#define TPS65023_REG_VERSION 0
30#define TPS65023_REG_PGOODZ 1
31#define TPS65023_REG_MASK 2
32#define TPS65023_REG_REG_CTRL 3
33#define TPS65023_REG_CON_CTRL 4
34#define TPS65023_REG_CON_CTRL2 5
35#define TPS65023_REG_DEF_CORE 6
36#define TPS65023_REG_DEFSLEW 7
37#define TPS65023_REG_LDO_CTRL 8
38
39/* PGOODZ bitfields */
40#define TPS65023_PGOODZ_PWRFAILZ BIT(7)
41#define TPS65023_PGOODZ_LOWBATTZ BIT(6)
42#define TPS65023_PGOODZ_VDCDC1 BIT(5)
43#define TPS65023_PGOODZ_VDCDC2 BIT(4)
44#define TPS65023_PGOODZ_VDCDC3 BIT(3)
45#define TPS65023_PGOODZ_LDO2 BIT(2)
46#define TPS65023_PGOODZ_LDO1 BIT(1)
47
48/* MASK bitfields */
49#define TPS65023_MASK_PWRFAILZ BIT(7)
50#define TPS65023_MASK_LOWBATTZ BIT(6)
51#define TPS65023_MASK_VDCDC1 BIT(5)
52#define TPS65023_MASK_VDCDC2 BIT(4)
53#define TPS65023_MASK_VDCDC3 BIT(3)
54#define TPS65023_MASK_LDO2 BIT(2)
55#define TPS65023_MASK_LDO1 BIT(1)
56
57/* REG_CTRL bitfields */
58#define TPS65023_REG_CTRL_VDCDC1_EN BIT(5)
59#define TPS65023_REG_CTRL_VDCDC2_EN BIT(4)
60#define TPS65023_REG_CTRL_VDCDC3_EN BIT(3)
61#define TPS65023_REG_CTRL_LDO2_EN BIT(2)
62#define TPS65023_REG_CTRL_LDO1_EN BIT(1)
63
64/* LDO_CTRL bitfields */
65#define TPS65023_LDO_CTRL_LDOx_SHIFT(ldo_id) ((ldo_id)*4)
66#define TPS65023_LDO_CTRL_LDOx_MASK(ldo_id) (0xF0 >> ((ldo_id)*4))
67
68/* Number of step-down converters available */
69#define TPS65023_NUM_DCDC 3
70/* Number of LDO voltage regulators available */
71#define TPS65023_NUM_LDO 2
72/* Number of total regulators available */
73#define TPS65023_NUM_REGULATOR (TPS65023_NUM_DCDC + TPS65023_NUM_LDO)
74
75/* DCDCs */
76#define TPS65023_DCDC_1 0
77#define TPS65023_DCDC_2 1
78#define TPS65023_DCDC_3 2
79/* LDOs */
80#define TPS65023_LDO_1 3
81#define TPS65023_LDO_2 4
82
83#define TPS65023_MAX_REG_ID TPS65023_LDO_2
84
85/* Supported voltage values for regulators */
86static const u16 VDCDC1_VSEL_table[] = {
87 800, 825, 850, 875,
88 900, 925, 950, 975,
89 1000, 1025, 1050, 1075,
90 1100, 1125, 1150, 1175,
91 1200, 1225, 1250, 1275,
92 1300, 1325, 1350, 1375,
93 1400, 1425, 1450, 1475,
94 1500, 1525, 1550, 1600,
95};
96
97static const u16 LDO1_VSEL_table[] = {
98 1000, 1100, 1300, 1800,
99 2200, 2600, 2800, 3150,
100};
101
102static const u16 LDO2_VSEL_table[] = {
103 1050, 1200, 1300, 1800,
104 2500, 2800, 3000, 3300,
105};
106
107static unsigned int num_voltages[] = {ARRAY_SIZE(VDCDC1_VSEL_table),
108 0, 0, ARRAY_SIZE(LDO1_VSEL_table),
109 ARRAY_SIZE(LDO2_VSEL_table)};
110
111/* Regulator specific details */
112struct tps_info {
113 const char *name;
114 unsigned min_uV;
115 unsigned max_uV;
116 bool fixed;
117 u8 table_len;
118 const u16 *table;
119};
120
121/* PMIC details */
122struct tps_pmic {
123 struct regulator_desc desc[TPS65023_NUM_REGULATOR];
124 struct i2c_client *client;
125 struct regulator_dev *rdev[TPS65023_NUM_REGULATOR];
126 const struct tps_info *info[TPS65023_NUM_REGULATOR];
127 struct mutex io_lock;
128};
129
130static inline int tps_65023_read(struct tps_pmic *tps, u8 reg)
131{
132 return i2c_smbus_read_byte_data(tps->client, reg);
133}
134
135static inline int tps_65023_write(struct tps_pmic *tps, u8 reg, u8 val)
136{
137 return i2c_smbus_write_byte_data(tps->client, reg, val);
138}
139
140static int tps_65023_set_bits(struct tps_pmic *tps, u8 reg, u8 mask)
141{
142 int err, data;
143
144 mutex_lock(&tps->io_lock);
145
146 data = tps_65023_read(tps, reg);
147 if (data < 0) {
148 dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
149 err = data;
150 goto out;
151 }
152
153 data |= mask;
154 err = tps_65023_write(tps, reg, data);
155 if (err)
156 dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
157
158out:
159 mutex_unlock(&tps->io_lock);
160 return err;
161}
162
163static int tps_65023_clear_bits(struct tps_pmic *tps, u8 reg, u8 mask)
164{
165 int err, data;
166
167 mutex_lock(&tps->io_lock);
168
169 data = tps_65023_read(tps, reg);
170 if (data < 0) {
171 dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
172 err = data;
173 goto out;
174 }
175
176 data &= ~mask;
177
178 err = tps_65023_write(tps, reg, data);
179 if (err)
180 dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
181
182out:
183 mutex_unlock(&tps->io_lock);
184 return err;
185
186}
187
188static int tps_65023_reg_read(struct tps_pmic *tps, u8 reg)
189{
190 int data;
191
192 mutex_lock(&tps->io_lock);
193
194 data = tps_65023_read(tps, reg);
195 if (data < 0)
196 dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
197
198 mutex_unlock(&tps->io_lock);
199 return data;
200}
201
202static int tps_65023_reg_write(struct tps_pmic *tps, u8 reg, u8 val)
203{
204 int err;
205
206 mutex_lock(&tps->io_lock);
207
208 err = tps_65023_write(tps, reg, val);
209 if (err < 0)
210 dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
211
212 mutex_unlock(&tps->io_lock);
213 return err;
214}
215
216static int tps65023_dcdc_is_enabled(struct regulator_dev *dev)
217{
218 struct tps_pmic *tps = rdev_get_drvdata(dev);
219 int data, dcdc = rdev_get_id(dev);
220 u8 shift;
221
222 if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
223 return -EINVAL;
224
225 shift = TPS65023_NUM_REGULATOR - dcdc;
226 data = tps_65023_reg_read(tps, TPS65023_REG_REG_CTRL);
227
228 if (data < 0)
229 return data;
230 else
231 return (data & 1<<shift) ? 1 : 0;
232}
233
234static int tps65023_ldo_is_enabled(struct regulator_dev *dev)
235{
236 struct tps_pmic *tps = rdev_get_drvdata(dev);
237 int data, ldo = rdev_get_id(dev);
238 u8 shift;
239
240 if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
241 return -EINVAL;
242
243 shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
244 data = tps_65023_reg_read(tps, TPS65023_REG_REG_CTRL);
245
246 if (data < 0)
247 return data;
248 else
249 return (data & 1<<shift) ? 1 : 0;
250}
251
252static int tps65023_dcdc_enable(struct regulator_dev *dev)
253{
254 struct tps_pmic *tps = rdev_get_drvdata(dev);
255 int dcdc = rdev_get_id(dev);
256 u8 shift;
257
258 if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
259 return -EINVAL;
260
261 shift = TPS65023_NUM_REGULATOR - dcdc;
262 return tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
263}
264
265static int tps65023_dcdc_disable(struct regulator_dev *dev)
266{
267 struct tps_pmic *tps = rdev_get_drvdata(dev);
268 int dcdc = rdev_get_id(dev);
269 u8 shift;
270
271 if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
272 return -EINVAL;
273
274 shift = TPS65023_NUM_REGULATOR - dcdc;
275 return tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
276}
277
278static int tps65023_ldo_enable(struct regulator_dev *dev)
279{
280 struct tps_pmic *tps = rdev_get_drvdata(dev);
281 int ldo = rdev_get_id(dev);
282 u8 shift;
283
284 if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
285 return -EINVAL;
286
287 shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
288 return tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
289}
290
291static int tps65023_ldo_disable(struct regulator_dev *dev)
292{
293 struct tps_pmic *tps = rdev_get_drvdata(dev);
294 int ldo = rdev_get_id(dev);
295 u8 shift;
296
297 if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
298 return -EINVAL;
299
300 shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
301 return tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
302}
303
304static int tps65023_dcdc_get_voltage(struct regulator_dev *dev)
305{
306 struct tps_pmic *tps = rdev_get_drvdata(dev);
307 int data, dcdc = rdev_get_id(dev);
308
309 if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
310 return -EINVAL;
311
312 if (dcdc == TPS65023_DCDC_1) {
313 data = tps_65023_reg_read(tps, TPS65023_REG_DEF_CORE);
314 if (data < 0)
315 return data;
316 data &= (tps->info[dcdc]->table_len - 1);
317 return tps->info[dcdc]->table[data] * 1000;
318 } else
319 return tps->info[dcdc]->min_uV;
320}
321
322static int tps65023_dcdc_set_voltage(struct regulator_dev *dev,
323 int min_uV, int max_uV)
324{
325 struct tps_pmic *tps = rdev_get_drvdata(dev);
326 int dcdc = rdev_get_id(dev);
327 int vsel;
328
329 if (dcdc != TPS65023_DCDC_1)
330 return -EINVAL;
331
332 if (min_uV < tps->info[dcdc]->min_uV
333 || min_uV > tps->info[dcdc]->max_uV)
334 return -EINVAL;
335 if (max_uV < tps->info[dcdc]->min_uV
336 || max_uV > tps->info[dcdc]->max_uV)
337 return -EINVAL;
338
339 for (vsel = 0; vsel < tps->info[dcdc]->table_len; vsel++) {
340 int mV = tps->info[dcdc]->table[vsel];
341 int uV = mV * 1000;
342
343 /* Break at the first in-range value */
344 if (min_uV <= uV && uV <= max_uV)
345 break;
346 }
347
348 /* write to the register in case we found a match */
349 if (vsel == tps->info[dcdc]->table_len)
350 return -EINVAL;
351 else
352 return tps_65023_reg_write(tps, TPS65023_REG_DEF_CORE, vsel);
353}
354
355static int tps65023_ldo_get_voltage(struct regulator_dev *dev)
356{
357 struct tps_pmic *tps = rdev_get_drvdata(dev);
358 int data, ldo = rdev_get_id(dev);
359
360 if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
361 return -EINVAL;
362
363 data = tps_65023_reg_read(tps, TPS65023_REG_LDO_CTRL);
364 if (data < 0)
365 return data;
366
367 data >>= (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1));
368 data &= (tps->info[ldo]->table_len - 1);
369 return tps->info[ldo]->table[data] * 1000;
370}
371
372static int tps65023_ldo_set_voltage(struct regulator_dev *dev,
373 int min_uV, int max_uV)
374{
375 struct tps_pmic *tps = rdev_get_drvdata(dev);
376 int data, vsel, ldo = rdev_get_id(dev);
377
378 if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
379 return -EINVAL;
380
381 if (min_uV < tps->info[ldo]->min_uV || min_uV > tps->info[ldo]->max_uV)
382 return -EINVAL;
383 if (max_uV < tps->info[ldo]->min_uV || max_uV > tps->info[ldo]->max_uV)
384 return -EINVAL;
385
386 for (vsel = 0; vsel < tps->info[ldo]->table_len; vsel++) {
387 int mV = tps->info[ldo]->table[vsel];
388 int uV = mV * 1000;
389
390 /* Break at the first in-range value */
391 if (min_uV <= uV && uV <= max_uV)
392 break;
393 }
394
395 if (vsel == tps->info[ldo]->table_len)
396 return -EINVAL;
397
398 data = tps_65023_reg_read(tps, TPS65023_REG_LDO_CTRL);
399 if (data < 0)
400 return data;
401
402 data &= TPS65023_LDO_CTRL_LDOx_MASK(ldo - TPS65023_LDO_1);
403 data |= (vsel << (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1)));
404 return tps_65023_reg_write(tps, TPS65023_REG_LDO_CTRL, data);
405}
406
407static int tps65023_dcdc_list_voltage(struct regulator_dev *dev,
408 unsigned selector)
409{
410 struct tps_pmic *tps = rdev_get_drvdata(dev);
411 int dcdc = rdev_get_id(dev);
412
413 if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
414 return -EINVAL;
415
416 if (dcdc == TPS65023_DCDC_1) {
417 if (selector >= tps->info[dcdc]->table_len)
418 return -EINVAL;
419 else
420 return tps->info[dcdc]->table[selector] * 1000;
421 } else
422 return tps->info[dcdc]->min_uV;
423}
424
425static int tps65023_ldo_list_voltage(struct regulator_dev *dev,
426 unsigned selector)
427{
428 struct tps_pmic *tps = rdev_get_drvdata(dev);
429 int ldo = rdev_get_id(dev);
430
431 if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
432 return -EINVAL;
433
434 if (selector >= tps->info[ldo]->table_len)
435 return -EINVAL;
436 else
437 return tps->info[ldo]->table[selector] * 1000;
438}
439
440/* Operations permitted on VDCDCx */
441static struct regulator_ops tps65023_dcdc_ops = {
442 .is_enabled = tps65023_dcdc_is_enabled,
443 .enable = tps65023_dcdc_enable,
444 .disable = tps65023_dcdc_disable,
445 .get_voltage = tps65023_dcdc_get_voltage,
446 .set_voltage = tps65023_dcdc_set_voltage,
447 .list_voltage = tps65023_dcdc_list_voltage,
448};
449
450/* Operations permitted on LDOx */
451static struct regulator_ops tps65023_ldo_ops = {
452 .is_enabled = tps65023_ldo_is_enabled,
453 .enable = tps65023_ldo_enable,
454 .disable = tps65023_ldo_disable,
455 .get_voltage = tps65023_ldo_get_voltage,
456 .set_voltage = tps65023_ldo_set_voltage,
457 .list_voltage = tps65023_ldo_list_voltage,
458};
459
460static int __devinit tps_65023_probe(struct i2c_client *client,
461 const struct i2c_device_id *id)
462{
463 static int desc_id;
464 const struct tps_info *info = (void *)id->driver_data;
465 struct regulator_init_data *init_data;
466 struct regulator_dev *rdev;
467 struct tps_pmic *tps;
468 int i;
469 int error;
470
471 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
472 return -EIO;
473
474 /**
475 * init_data points to array of regulator_init structures
476 * coming from the board-evm file.
477 */
478 init_data = client->dev.platform_data;
479 if (!init_data)
480 return -EIO;
481
482 tps = kzalloc(sizeof(*tps), GFP_KERNEL);
483 if (!tps)
484 return -ENOMEM;
485
486 mutex_init(&tps->io_lock);
487
488 /* common for all regulators */
489 tps->client = client;
490
491 for (i = 0; i < TPS65023_NUM_REGULATOR; i++, info++, init_data++) {
492 /* Store regulator specific information */
493 tps->info[i] = info;
494
495 tps->desc[i].name = info->name;
496 tps->desc[i].id = desc_id++;
497 tps->desc[i].n_voltages = num_voltages[i];
498 tps->desc[i].ops = (i > TPS65023_DCDC_3 ?
499 &tps65023_ldo_ops : &tps65023_dcdc_ops);
500 tps->desc[i].type = REGULATOR_VOLTAGE;
501 tps->desc[i].owner = THIS_MODULE;
502
503 /* Register the regulators */
504 rdev = regulator_register(&tps->desc[i], &client->dev,
505 init_data, tps);
506 if (IS_ERR(rdev)) {
507 dev_err(&client->dev, "failed to register %s\n",
508 id->name);
509 error = PTR_ERR(rdev);
510 goto fail;
511 }
512
513 /* Save regulator for cleanup */
514 tps->rdev[i] = rdev;
515 }
516
517 i2c_set_clientdata(client, tps);
518
519 return 0;
520
521 fail:
522 while (--i >= 0)
523 regulator_unregister(tps->rdev[i]);
524
525 kfree(tps);
526 return error;
527}
528
529/**
530 * tps_65023_remove - TPS65023 driver i2c remove handler
531 * @client: i2c driver client device structure
532 *
533 * Unregister TPS driver as an i2c client device driver
534 */
535static int __devexit tps_65023_remove(struct i2c_client *client)
536{
537 struct tps_pmic *tps = i2c_get_clientdata(client);
538 int i;
539
540 /* clear the client data in i2c */
541 i2c_set_clientdata(client, NULL);
542
543 for (i = 0; i < TPS65023_NUM_REGULATOR; i++)
544 regulator_unregister(tps->rdev[i]);
545
546 kfree(tps);
547
548 return 0;
549}
550
551static const struct tps_info tps65023_regs[] = {
552 {
553 .name = "VDCDC1",
554 .min_uV = 800000,
555 .max_uV = 1600000,
556 .table_len = ARRAY_SIZE(VDCDC1_VSEL_table),
557 .table = VDCDC1_VSEL_table,
558 },
559 {
560 .name = "VDCDC2",
561 .min_uV = 3300000,
562 .max_uV = 3300000,
563 .fixed = 1,
564 },
565 {
566 .name = "VDCDC3",
567 .min_uV = 1800000,
568 .max_uV = 1800000,
569 .fixed = 1,
570 },
571 {
572 .name = "LDO1",
573 .min_uV = 1000000,
574 .max_uV = 3150000,
575 .table_len = ARRAY_SIZE(LDO1_VSEL_table),
576 .table = LDO1_VSEL_table,
577 },
578 {
579 .name = "LDO2",
580 .min_uV = 1050000,
581 .max_uV = 3300000,
582 .table_len = ARRAY_SIZE(LDO2_VSEL_table),
583 .table = LDO2_VSEL_table,
584 },
585};
586
587static const struct i2c_device_id tps_65023_id[] = {
588 {.name = "tps65023",
589 .driver_data = (unsigned long) tps65023_regs,},
590 { },
591};
592
593MODULE_DEVICE_TABLE(i2c, tps_65023_id);
594
595static struct i2c_driver tps_65023_i2c_driver = {
596 .driver = {
597 .name = "tps65023",
598 .owner = THIS_MODULE,
599 },
600 .probe = tps_65023_probe,
601 .remove = __devexit_p(tps_65023_remove),
602 .id_table = tps_65023_id,
603};
604
605/**
606 * tps_65023_init
607 *
608 * Module init function
609 */
610static int __init tps_65023_init(void)
611{
612 return i2c_add_driver(&tps_65023_i2c_driver);
613}
614subsys_initcall(tps_65023_init);
615
616/**
617 * tps_65023_cleanup
618 *
619 * Module exit function
620 */
621static void __exit tps_65023_cleanup(void)
622{
623 i2c_del_driver(&tps_65023_i2c_driver);
624}
625module_exit(tps_65023_cleanup);
626
627MODULE_AUTHOR("Texas Instruments");
628MODULE_DESCRIPTION("TPS65023 voltage regulator driver");
629MODULE_LICENSE("GPL v2");