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Haojian Zhuanga71b7972010-01-25 10:24:09 -05001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Haojian Zhuanga71b7972010-01-25 10:24:09 -050018#include <linux/regulator/max8649.h>
Jonghwan Choic5b68d472011-10-24 22:26:26 +090019#include <linux/regmap.h>
Haojian Zhuanga71b7972010-01-25 10:24:09 -050020
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;
Haojian Zhuanga71b7972010-01-25 10:24:09 -050053 struct device *dev;
Jonghwan Choic5b68d472011-10-24 22:26:26 +090054 struct regmap *regmap;
Haojian Zhuanga71b7972010-01-25 10:24:09 -050055
Haojian Zhuanga71b7972010-01-25 10:24:09 -050056 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
Haojian Zhuanga71b7972010-01-25 10:24:09 -050063static int max8649_enable_time(struct regulator_dev *rdev)
64{
65 struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
66 int voltage, rate, ret;
Jonghwan Choic5b68d472011-10-24 22:26:26 +090067 unsigned int val;
Haojian Zhuanga71b7972010-01-25 10:24:09 -050068
69 /* get voltage */
Axel Lin817d8c22012-05-15 00:13:10 +080070 ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
Jonghwan Choic5b68d472011-10-24 22:26:26 +090071 if (ret != 0)
Haojian Zhuanga71b7972010-01-25 10:24:09 -050072 return ret;
Jonghwan Choic5b68d472011-10-24 22:26:26 +090073 val &= MAX8649_VOL_MASK;
Axel Lin0fb737b2012-05-15 00:14:05 +080074 voltage = regulator_list_voltage_linear(rdev, (unsigned char)val);
Haojian Zhuanga71b7972010-01-25 10:24:09 -050075
76 /* get rate */
Jonghwan Choic5b68d472011-10-24 22:26:26 +090077 ret = regmap_read(info->regmap, MAX8649_RAMP, &val);
78 if (ret != 0)
Haojian Zhuanga71b7972010-01-25 10:24:09 -050079 return ret;
Jonghwan Choic5b68d472011-10-24 22:26:26 +090080 ret = (val & MAX8649_RAMP_MASK) >> 5;
Haojian Zhuanga71b7972010-01-25 10:24:09 -050081 rate = (32 * 1000) >> ret; /* uV/uS */
82
Axel Line69c4992011-08-02 12:54:56 +080083 return DIV_ROUND_UP(voltage, rate);
Haojian Zhuanga71b7972010-01-25 10:24:09 -050084}
85
86static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
87{
88 struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
89
90 switch (mode) {
91 case REGULATOR_MODE_FAST:
Axel Lin817d8c22012-05-15 00:13:10 +080092 regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
93 MAX8649_FORCE_PWM, MAX8649_FORCE_PWM);
Haojian Zhuanga71b7972010-01-25 10:24:09 -050094 break;
95 case REGULATOR_MODE_NORMAL:
Axel Lin817d8c22012-05-15 00:13:10 +080096 regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
Jonghwan Choic5b68d472011-10-24 22:26:26 +090097 MAX8649_FORCE_PWM, 0);
Haojian Zhuanga71b7972010-01-25 10:24:09 -050098 break;
99 default:
100 return -EINVAL;
101 }
102 return 0;
103}
104
105static unsigned int max8649_get_mode(struct regulator_dev *rdev)
106{
107 struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
Jonghwan Choic5b68d472011-10-24 22:26:26 +0900108 unsigned int val;
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500109 int ret;
110
Axel Lin817d8c22012-05-15 00:13:10 +0800111 ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
Jonghwan Choic5b68d472011-10-24 22:26:26 +0900112 if (ret != 0)
113 return ret;
114 if (val & MAX8649_FORCE_PWM)
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500115 return REGULATOR_MODE_FAST;
116 return REGULATOR_MODE_NORMAL;
117}
118
119static struct regulator_ops max8649_dcdc_ops = {
Axel Lin40baece2012-05-15 00:15:11 +0800120 .set_voltage_sel = regulator_set_voltage_sel_regmap,
Axel Lin817d8c22012-05-15 00:13:10 +0800121 .get_voltage_sel = regulator_get_voltage_sel_regmap,
Axel Lin0fb737b2012-05-15 00:14:05 +0800122 .list_voltage = regulator_list_voltage_linear,
Axel Lin40baece2012-05-15 00:15:11 +0800123 .map_voltage = regulator_map_voltage_linear,
Axel Linea88b132013-03-05 14:17:57 +0800124 .enable = regulator_enable_regmap,
125 .disable = regulator_disable_regmap,
126 .is_enabled = regulator_is_enabled_regmap,
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500127 .enable_time = max8649_enable_time,
128 .set_mode = max8649_set_mode,
129 .get_mode = max8649_get_mode,
130
131};
132
Axel Lin817d8c22012-05-15 00:13:10 +0800133static struct regulator_desc dcdc_desc = {
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500134 .name = "max8649",
135 .ops = &max8649_dcdc_ops,
136 .type = REGULATOR_VOLTAGE,
137 .n_voltages = 1 << 6,
138 .owner = THIS_MODULE,
Axel Lin817d8c22012-05-15 00:13:10 +0800139 .vsel_mask = MAX8649_VOL_MASK,
Axel Lin0fb737b2012-05-15 00:14:05 +0800140 .min_uV = MAX8649_DCDC_VMIN,
141 .uV_step = MAX8649_DCDC_STEP,
Axel Linea88b132013-03-05 14:17:57 +0800142 .enable_reg = MAX8649_CONTROL,
143 .enable_mask = MAX8649_EN_PD,
144 .enable_is_inverted = true,
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500145};
146
Jonghwan Choic5b68d472011-10-24 22:26:26 +0900147static struct regmap_config max8649_regmap_config = {
148 .reg_bits = 8,
149 .val_bits = 8,
150};
151
Bill Pembertona5023572012-11-19 13:22:22 -0500152static int max8649_regulator_probe(struct i2c_client *client,
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500153 const struct i2c_device_id *id)
154{
155 struct max8649_platform_data *pdata = client->dev.platform_data;
156 struct max8649_regulator_info *info = NULL;
Mark Brownc1727082012-04-04 00:50:22 +0100157 struct regulator_config config = { };
Jonghwan Choic5b68d472011-10-24 22:26:26 +0900158 unsigned int val;
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500159 unsigned char data;
160 int ret;
161
Axel Lindc553a72012-04-07 23:28:28 +0800162 info = devm_kzalloc(&client->dev, sizeof(struct max8649_regulator_info),
163 GFP_KERNEL);
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500164 if (!info) {
165 dev_err(&client->dev, "No enough memory\n");
166 return -ENOMEM;
167 }
168
Axel Lindc553a72012-04-07 23:28:28 +0800169 info->regmap = devm_regmap_init_i2c(client, &max8649_regmap_config);
Jonghwan Choic5b68d472011-10-24 22:26:26 +0900170 if (IS_ERR(info->regmap)) {
171 ret = PTR_ERR(info->regmap);
172 dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);
Axel Lindc553a72012-04-07 23:28:28 +0800173 return ret;
Jonghwan Choic5b68d472011-10-24 22:26:26 +0900174 }
175
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500176 info->dev = &client->dev;
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500177 i2c_set_clientdata(client, info);
178
179 info->mode = pdata->mode;
180 switch (info->mode) {
181 case 0:
Axel Lin817d8c22012-05-15 00:13:10 +0800182 dcdc_desc.vsel_reg = MAX8649_MODE0;
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500183 break;
184 case 1:
Axel Lin817d8c22012-05-15 00:13:10 +0800185 dcdc_desc.vsel_reg = MAX8649_MODE1;
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500186 break;
187 case 2:
Axel Lin817d8c22012-05-15 00:13:10 +0800188 dcdc_desc.vsel_reg = MAX8649_MODE2;
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500189 break;
190 case 3:
Axel Lin817d8c22012-05-15 00:13:10 +0800191 dcdc_desc.vsel_reg = MAX8649_MODE3;
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500192 break;
193 default:
194 break;
195 }
196
Jonghwan Choic5b68d472011-10-24 22:26:26 +0900197 ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);
198 if (ret != 0) {
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500199 dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
200 ret);
Axel Lindc553a72012-04-07 23:28:28 +0800201 return ret;
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500202 }
Axel Linda7de6a2012-02-06 20:37:46 +0800203 dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", val);
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500204
205 /* enable VID0 & VID1 */
Jonghwan Choic5b68d472011-10-24 22:26:26 +0900206 regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500207
208 /* enable/disable external clock synchronization */
209 info->extclk = pdata->extclk;
210 data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;
Axel Lin817d8c22012-05-15 00:13:10 +0800211 regmap_update_bits(info->regmap, dcdc_desc.vsel_reg,
212 MAX8649_SYNC_EXTCLK, data);
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500213 if (info->extclk) {
214 /* set external clock frequency */
215 info->extclk_freq = pdata->extclk_freq;
Jonghwan Choic5b68d472011-10-24 22:26:26 +0900216 regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,
217 info->extclk_freq << 6);
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500218 }
219
220 if (pdata->ramp_timing) {
221 info->ramp_timing = pdata->ramp_timing;
Jonghwan Choic5b68d472011-10-24 22:26:26 +0900222 regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,
223 info->ramp_timing << 5);
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500224 }
225
226 info->ramp_down = pdata->ramp_down;
227 if (info->ramp_down) {
Jonghwan Choic5b68d472011-10-24 22:26:26 +0900228 regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,
229 MAX8649_RAMP_DOWN);
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500230 }
231
Mark Brownc1727082012-04-04 00:50:22 +0100232 config.dev = &client->dev;
233 config.init_data = pdata->regulator;
234 config.driver_data = info;
Haojian Zhuang61663172012-06-05 18:10:10 +0800235 config.regmap = info->regmap;
Mark Brownc1727082012-04-04 00:50:22 +0100236
237 info->regulator = regulator_register(&dcdc_desc, &config);
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500238 if (IS_ERR(info->regulator)) {
239 dev_err(info->dev, "failed to register regulator %s\n",
240 dcdc_desc.name);
Axel Lindc553a72012-04-07 23:28:28 +0800241 return PTR_ERR(info->regulator);
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500242 }
243
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500244 return 0;
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500245}
246
Bill Pemberton8dc995f2012-11-19 13:26:10 -0500247static int max8649_regulator_remove(struct i2c_client *client)
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500248{
249 struct max8649_regulator_info *info = i2c_get_clientdata(client);
250
Axel Lin020501f2013-04-27 13:58:08 +0800251 if (info)
252 regulator_unregister(info->regulator);
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500253
254 return 0;
255}
256
257static const struct i2c_device_id max8649_id[] = {
258 { "max8649", 0 },
259 { }
260};
261MODULE_DEVICE_TABLE(i2c, max8649_id);
262
263static struct i2c_driver max8649_driver = {
264 .probe = max8649_regulator_probe,
Bill Pemberton5eb9f2b2012-11-19 13:20:42 -0500265 .remove = max8649_regulator_remove,
Haojian Zhuanga71b7972010-01-25 10:24:09 -0500266 .driver = {
267 .name = "max8649",
268 },
269 .id_table = max8649_id,
270};
271
272static int __init max8649_init(void)
273{
274 return i2c_add_driver(&max8649_driver);
275}
276subsys_initcall(max8649_init);
277
278static void __exit max8649_exit(void)
279{
280 i2c_del_driver(&max8649_driver);
281}
282module_exit(max8649_exit);
283
284/* Module information */
285MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");
286MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
287MODULE_LICENSE("GPL");