Root/drivers/regulator/max8649.c

1/*
2 * Regulators driver for Maxim max8649
3 *
4 * Copyright (C) 2009-2010 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/err.h>
14#include <linux/i2c.h>
15#include <linux/platform_device.h>
16#include <linux/regulator/driver.h>
17#include <linux/slab.h>
18#include <linux/regulator/max8649.h>
19#include <linux/regmap.h>
20
21#define MAX8649_DCDC_VMIN 750000 /* uV */
22#define MAX8649_DCDC_VMAX 1380000 /* uV */
23#define MAX8649_DCDC_STEP 10000 /* uV */
24#define MAX8649_VOL_MASK 0x3f
25
26/* Registers */
27#define MAX8649_MODE0 0x00
28#define MAX8649_MODE1 0x01
29#define MAX8649_MODE2 0x02
30#define MAX8649_MODE3 0x03
31#define MAX8649_CONTROL 0x04
32#define MAX8649_SYNC 0x05
33#define MAX8649_RAMP 0x06
34#define MAX8649_CHIP_ID1 0x08
35#define MAX8649_CHIP_ID2 0x09
36
37/* Bits */
38#define MAX8649_EN_PD (1 << 7)
39#define MAX8649_VID0_PD (1 << 6)
40#define MAX8649_VID1_PD (1 << 5)
41#define MAX8649_VID_MASK (3 << 5)
42
43#define MAX8649_FORCE_PWM (1 << 7)
44#define MAX8649_SYNC_EXTCLK (1 << 6)
45
46#define MAX8649_EXT_MASK (3 << 6)
47
48#define MAX8649_RAMP_MASK (7 << 5)
49#define MAX8649_RAMP_DOWN (1 << 1)
50
51struct max8649_regulator_info {
52    struct regulator_dev *regulator;
53    struct device *dev;
54    struct regmap *regmap;
55
56    unsigned mode:2; /* bit[1:0] = VID1, VID0 */
57    unsigned extclk_freq:2;
58    unsigned extclk:1;
59    unsigned ramp_timing:3;
60    unsigned ramp_down:1;
61};
62
63/* EN_PD means pulldown on EN input */
64static int max8649_enable(struct regulator_dev *rdev)
65{
66    struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
67    return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD, 0);
68}
69
70/*
71 * Applied internal pulldown resistor on EN input pin.
72 * If pulldown EN pin outside, it would be better.
73 */
74static int max8649_disable(struct regulator_dev *rdev)
75{
76    struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
77    return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD,
78                MAX8649_EN_PD);
79}
80
81static int max8649_is_enabled(struct regulator_dev *rdev)
82{
83    struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
84    unsigned int val;
85    int ret;
86
87    ret = regmap_read(info->regmap, MAX8649_CONTROL, &val);
88    if (ret != 0)
89        return ret;
90    return !((unsigned char)val & MAX8649_EN_PD);
91}
92
93static int max8649_enable_time(struct regulator_dev *rdev)
94{
95    struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
96    int voltage, rate, ret;
97    unsigned int val;
98
99    /* get voltage */
100    ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
101    if (ret != 0)
102        return ret;
103    val &= MAX8649_VOL_MASK;
104    voltage = regulator_list_voltage_linear(rdev, (unsigned char)val);
105
106    /* get rate */
107    ret = regmap_read(info->regmap, MAX8649_RAMP, &val);
108    if (ret != 0)
109        return ret;
110    ret = (val & MAX8649_RAMP_MASK) >> 5;
111    rate = (32 * 1000) >> ret; /* uV/uS */
112
113    return DIV_ROUND_UP(voltage, rate);
114}
115
116static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
117{
118    struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
119
120    switch (mode) {
121    case REGULATOR_MODE_FAST:
122        regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
123                   MAX8649_FORCE_PWM, MAX8649_FORCE_PWM);
124        break;
125    case REGULATOR_MODE_NORMAL:
126        regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
127                   MAX8649_FORCE_PWM, 0);
128        break;
129    default:
130        return -EINVAL;
131    }
132    return 0;
133}
134
135static unsigned int max8649_get_mode(struct regulator_dev *rdev)
136{
137    struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
138    unsigned int val;
139    int ret;
140
141    ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
142    if (ret != 0)
143        return ret;
144    if (val & MAX8649_FORCE_PWM)
145        return REGULATOR_MODE_FAST;
146    return REGULATOR_MODE_NORMAL;
147}
148
149static struct regulator_ops max8649_dcdc_ops = {
150    .set_voltage_sel = regulator_set_voltage_sel_regmap,
151    .get_voltage_sel = regulator_get_voltage_sel_regmap,
152    .list_voltage = regulator_list_voltage_linear,
153    .map_voltage = regulator_map_voltage_linear,
154    .enable = max8649_enable,
155    .disable = max8649_disable,
156    .is_enabled = max8649_is_enabled,
157    .enable_time = max8649_enable_time,
158    .set_mode = max8649_set_mode,
159    .get_mode = max8649_get_mode,
160
161};
162
163static struct regulator_desc dcdc_desc = {
164    .name = "max8649",
165    .ops = &max8649_dcdc_ops,
166    .type = REGULATOR_VOLTAGE,
167    .n_voltages = 1 << 6,
168    .owner = THIS_MODULE,
169    .vsel_mask = MAX8649_VOL_MASK,
170    .min_uV = MAX8649_DCDC_VMIN,
171    .uV_step = MAX8649_DCDC_STEP,
172};
173
174static struct regmap_config max8649_regmap_config = {
175    .reg_bits = 8,
176    .val_bits = 8,
177};
178
179static int __devinit max8649_regulator_probe(struct i2c_client *client,
180                         const struct i2c_device_id *id)
181{
182    struct max8649_platform_data *pdata = client->dev.platform_data;
183    struct max8649_regulator_info *info = NULL;
184    struct regulator_config config = { };
185    unsigned int val;
186    unsigned char data;
187    int ret;
188
189    info = devm_kzalloc(&client->dev, sizeof(struct max8649_regulator_info),
190                GFP_KERNEL);
191    if (!info) {
192        dev_err(&client->dev, "No enough memory\n");
193        return -ENOMEM;
194    }
195
196    info->regmap = devm_regmap_init_i2c(client, &max8649_regmap_config);
197    if (IS_ERR(info->regmap)) {
198        ret = PTR_ERR(info->regmap);
199        dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);
200        return ret;
201    }
202
203    info->dev = &client->dev;
204    i2c_set_clientdata(client, info);
205
206    info->mode = pdata->mode;
207    switch (info->mode) {
208    case 0:
209        dcdc_desc.vsel_reg = MAX8649_MODE0;
210        break;
211    case 1:
212        dcdc_desc.vsel_reg = MAX8649_MODE1;
213        break;
214    case 2:
215        dcdc_desc.vsel_reg = MAX8649_MODE2;
216        break;
217    case 3:
218        dcdc_desc.vsel_reg = MAX8649_MODE3;
219        break;
220    default:
221        break;
222    }
223
224    ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);
225    if (ret != 0) {
226        dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
227            ret);
228        return ret;
229    }
230    dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", val);
231
232    /* enable VID0 & VID1 */
233    regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);
234
235    /* enable/disable external clock synchronization */
236    info->extclk = pdata->extclk;
237    data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;
238    regmap_update_bits(info->regmap, dcdc_desc.vsel_reg,
239               MAX8649_SYNC_EXTCLK, data);
240    if (info->extclk) {
241        /* set external clock frequency */
242        info->extclk_freq = pdata->extclk_freq;
243        regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,
244                   info->extclk_freq << 6);
245    }
246
247    if (pdata->ramp_timing) {
248        info->ramp_timing = pdata->ramp_timing;
249        regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,
250                   info->ramp_timing << 5);
251    }
252
253    info->ramp_down = pdata->ramp_down;
254    if (info->ramp_down) {
255        regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,
256                   MAX8649_RAMP_DOWN);
257    }
258
259    config.dev = &client->dev;
260    config.init_data = pdata->regulator;
261    config.driver_data = info;
262    config.regmap = info->regmap;
263
264    info->regulator = regulator_register(&dcdc_desc, &config);
265    if (IS_ERR(info->regulator)) {
266        dev_err(info->dev, "failed to register regulator %s\n",
267            dcdc_desc.name);
268        return PTR_ERR(info->regulator);
269    }
270
271    return 0;
272}
273
274static int __devexit max8649_regulator_remove(struct i2c_client *client)
275{
276    struct max8649_regulator_info *info = i2c_get_clientdata(client);
277
278    if (info) {
279        if (info->regulator)
280            regulator_unregister(info->regulator);
281    }
282
283    return 0;
284}
285
286static const struct i2c_device_id max8649_id[] = {
287    { "max8649", 0 },
288    { }
289};
290MODULE_DEVICE_TABLE(i2c, max8649_id);
291
292static struct i2c_driver max8649_driver = {
293    .probe = max8649_regulator_probe,
294    .remove = __devexit_p(max8649_regulator_remove),
295    .driver = {
296        .name = "max8649",
297    },
298    .id_table = max8649_id,
299};
300
301static int __init max8649_init(void)
302{
303    return i2c_add_driver(&max8649_driver);
304}
305subsys_initcall(max8649_init);
306
307static void __exit max8649_exit(void)
308{
309    i2c_del_driver(&max8649_driver);
310}
311module_exit(max8649_exit);
312
313/* Module information */
314MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");
315MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
316MODULE_LICENSE("GPL");
317

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