Root/drivers/regulator/lp3971.c

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
24struct 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
32static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
33static 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
59static 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
68static 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#define BUCK_TARGET_VOL_MIN_IDX 0x01
77#define BUCK_TARGET_VOL_MAX_IDX 0x19
78
79#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
80
81#define LP3971_LDO_ENABLE_REG 0x12
82#define LP3971_LDO_VOL_CONTR_BASE 0x39
83
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
90*/
91#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
92
93/* Voltage control registers shift:
94    LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
95    LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
96    LP3971_LDO5 -> 0
97*/
98#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
99#define LDO_VOL_CONTR_MASK 0x0f
100
101static const unsigned int ldo45_voltage_map[] = {
102    1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
103    1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
104};
105
106static const unsigned int ldo123_voltage_map[] = {
107    1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
108    2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
109};
110
111#define LDO_VOL_MIN_IDX 0x00
112#define LDO_VOL_MAX_IDX 0x0f
113
114static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
115{
116    struct lp3971 *lp3971 = rdev_get_drvdata(dev);
117    int ldo = rdev_get_id(dev) - LP3971_LDO1;
118    u16 mask = 1 << (1 + ldo);
119    u16 val;
120
121    val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
122    return (val & mask) != 0;
123}
124
125static int lp3971_ldo_enable(struct regulator_dev *dev)
126{
127    struct lp3971 *lp3971 = rdev_get_drvdata(dev);
128    int ldo = rdev_get_id(dev) - LP3971_LDO1;
129    u16 mask = 1 << (1 + ldo);
130
131    return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
132}
133
134static int lp3971_ldo_disable(struct regulator_dev *dev)
135{
136    struct lp3971 *lp3971 = rdev_get_drvdata(dev);
137    int ldo = rdev_get_id(dev) - LP3971_LDO1;
138    u16 mask = 1 << (1 + ldo);
139
140    return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
141}
142
143static int lp3971_ldo_get_voltage(struct regulator_dev *dev)
144{
145    struct lp3971 *lp3971 = rdev_get_drvdata(dev);
146    int ldo = rdev_get_id(dev) - LP3971_LDO1;
147    u16 val, reg;
148
149    reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
150    val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
151
152    return dev->desc->volt_table[val];
153}
154
155static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
156                      unsigned int selector)
157{
158    struct lp3971 *lp3971 = rdev_get_drvdata(dev);
159    int ldo = rdev_get_id(dev) - LP3971_LDO1;
160
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));
164}
165
166static 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,
173};
174
175static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
176{
177    struct lp3971 *lp3971 = rdev_get_drvdata(dev);
178    int buck = rdev_get_id(dev) - LP3971_DCDC1;
179    u16 mask = 1 << (buck * 2);
180    u16 val;
181
182    val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
183    return (val & mask) != 0;
184}
185
186static int lp3971_dcdc_enable(struct regulator_dev *dev)
187{
188    struct lp3971 *lp3971 = rdev_get_drvdata(dev);
189    int buck = rdev_get_id(dev) - LP3971_DCDC1;
190    u16 mask = 1 << (buck * 2);
191
192    return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
193}
194
195static int lp3971_dcdc_disable(struct regulator_dev *dev)
196{
197    struct lp3971 *lp3971 = rdev_get_drvdata(dev);
198    int buck = rdev_get_id(dev) - LP3971_DCDC1;
199    u16 mask = 1 << (buck * 2);
200
201    return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
202}
203
204static int lp3971_dcdc_get_voltage(struct regulator_dev *dev)
205{
206    struct lp3971 *lp3971 = rdev_get_drvdata(dev);
207    int buck = rdev_get_id(dev) - LP3971_DCDC1;
208    u16 reg;
209    int val;
210
211    reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
212    reg &= BUCK_TARGET_VOL_MASK;
213
214    if (reg <= BUCK_TARGET_VOL_MAX_IDX)
215        val = buck_voltage_map[reg];
216    else {
217        val = 0;
218        dev_warn(&dev->dev, "chip reported incorrect voltage value.\n");
219    }
220
221    return val;
222}
223
224static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
225                       unsigned int selector)
226{
227    struct lp3971 *lp3971 = rdev_get_drvdata(dev);
228    int buck = rdev_get_id(dev) - LP3971_DCDC1;
229    int ret;
230
231    ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
232           BUCK_TARGET_VOL_MASK, selector);
233    if (ret)
234        return ret;
235
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));
239    if (ret)
240        return ret;
241
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));
245}
246
247static 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,
254};
255
256static const struct regulator_desc regulators[] = {
257    {
258        .name = "LDO1",
259        .id = LP3971_LDO1,
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,
265    },
266    {
267        .name = "LDO2",
268        .id = LP3971_LDO2,
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,
274    },
275    {
276        .name = "LDO3",
277        .id = LP3971_LDO3,
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,
283    },
284    {
285        .name = "LDO4",
286        .id = LP3971_LDO4,
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,
292    },
293    {
294        .name = "LDO5",
295        .id = LP3971_LDO5,
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,
301    },
302    {
303        .name = "DCDC1",
304        .id = LP3971_DCDC1,
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,
310    },
311    {
312        .name = "DCDC2",
313        .id = LP3971_DCDC2,
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,
319    },
320    {
321        .name = "DCDC3",
322        .id = LP3971_DCDC3,
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,
328    },
329};
330
331static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
332    u16 *dest)
333{
334    int ret;
335
336    if (count != 1)
337        return -EIO;
338    ret = i2c_smbus_read_byte_data(i2c, reg);
339    if (ret < 0)
340        return -EIO;
341
342    *dest = ret;
343    return 0;
344}
345
346static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
347    const u16 *src)
348{
349    if (count != 1)
350        return -EIO;
351    return i2c_smbus_write_byte_data(i2c, reg, *src);
352}
353
354static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
355{
356    u16 val = 0;
357
358    mutex_lock(&lp3971->io_lock);
359
360    lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
361
362    dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
363        (unsigned)val&0xff);
364
365    mutex_unlock(&lp3971->io_lock);
366
367    return val & 0xff;
368}
369
370static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
371{
372    u16 tmp;
373    int ret;
374
375    mutex_lock(&lp3971->io_lock);
376
377    ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
378    tmp = (tmp & ~mask) | val;
379    if (ret == 0) {
380        ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
381        dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
382            (unsigned)val&0xff);
383    }
384    mutex_unlock(&lp3971->io_lock);
385
386    return ret;
387}
388
389static int __devinit setup_regulators(struct lp3971 *lp3971,
390                      struct lp3971_platform_data *pdata)
391{
392    int i, err;
393
394    lp3971->num_regulators = pdata->num_regulators;
395    lp3971->rdev = kcalloc(pdata->num_regulators,
396                sizeof(struct regulator_dev *), GFP_KERNEL);
397    if (!lp3971->rdev) {
398        err = -ENOMEM;
399        goto err_nomem;
400    }
401
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];
406
407        config.dev = lp3971->dev;
408        config.init_data = reg->initdata;
409        config.driver_data = lp3971;
410
411        lp3971->rdev[i] = regulator_register(&regulators[reg->id],
412                             &config);
413        if (IS_ERR(lp3971->rdev[i])) {
414            err = PTR_ERR(lp3971->rdev[i]);
415            dev_err(lp3971->dev, "regulator init failed: %d\n",
416                err);
417            goto error;
418        }
419    }
420
421    return 0;
422
423error:
424    while (--i >= 0)
425        regulator_unregister(lp3971->rdev[i]);
426    kfree(lp3971->rdev);
427    lp3971->rdev = NULL;
428err_nomem:
429    return err;
430}
431
432static int __devinit lp3971_i2c_probe(struct i2c_client *i2c,
433                const struct i2c_device_id *id)
434{
435    struct lp3971 *lp3971;
436    struct lp3971_platform_data *pdata = i2c->dev.platform_data;
437    int ret;
438    u16 val;
439
440    if (!pdata) {
441        dev_dbg(&i2c->dev, "No platform init data supplied\n");
442        return -ENODEV;
443    }
444
445    lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL);
446    if (lp3971 == NULL)
447        return -ENOMEM;
448
449    lp3971->i2c = i2c;
450    lp3971->dev = &i2c->dev;
451
452    mutex_init(&lp3971->io_lock);
453
454    /* Detect LP3971 */
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)
457        ret = -ENODEV;
458    if (ret < 0) {
459        dev_err(&i2c->dev, "failed to detect device\n");
460        goto err_detect;
461    }
462
463    ret = setup_regulators(lp3971, pdata);
464    if (ret < 0)
465        goto err_detect;
466
467    i2c_set_clientdata(i2c, lp3971);
468    return 0;
469
470err_detect:
471    kfree(lp3971);
472    return ret;
473}
474
475static int __devexit lp3971_i2c_remove(struct i2c_client *i2c)
476{
477    struct lp3971 *lp3971 = i2c_get_clientdata(i2c);
478    int i;
479
480    for (i = 0; i < lp3971->num_regulators; i++)
481        regulator_unregister(lp3971->rdev[i]);
482
483    kfree(lp3971->rdev);
484    kfree(lp3971);
485
486    return 0;
487}
488
489static const struct i2c_device_id lp3971_i2c_id[] = {
490       { "lp3971", 0 },
491       { }
492};
493MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
494
495static struct i2c_driver lp3971_i2c_driver = {
496    .driver = {
497        .name = "LP3971",
498        .owner = THIS_MODULE,
499    },
500    .probe = lp3971_i2c_probe,
501    .remove = __devexit_p(lp3971_i2c_remove),
502    .id_table = lp3971_i2c_id,
503};
504
505module_i2c_driver(lp3971_i2c_driver);
506
507MODULE_LICENSE("GPL");
508MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
509MODULE_DESCRIPTION("LP3971 PMIC driver");
510

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