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Robert Jarzmik55f4fa42009-04-23 20:10:43 +02001/*
2 * max1586.c -- Voltage and current regulation for the Maxim 1586
3 *
4 * Copyright (C) 2008 Robert Jarzmik
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20#include <linux/module.h>
21#include <linux/err.h>
22#include <linux/i2c.h>
23#include <linux/platform_device.h>
24#include <linux/regulator/driver.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/slab.h>
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020026#include <linux/regulator/max1586.h>
27
28#define MAX1586_V3_MAX_VSEL 31
29#define MAX1586_V6_MAX_VSEL 3
30
31#define MAX1586_V3_MIN_UV 700000
32#define MAX1586_V3_MAX_UV 1475000
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020033
34#define MAX1586_V6_MIN_UV 0
35#define MAX1586_V6_MAX_UV 3000000
36
37#define I2C_V3_SELECT (0 << 5)
38#define I2C_V6_SELECT (1 << 5)
39
Philipp Zabelb110a8f2009-05-28 07:15:16 +020040struct max1586_data {
41 struct i2c_client *client;
42
43 /* min/max V3 voltage */
Philipp Zabelc8f1e502009-05-28 21:00:03 +020044 unsigned int min_uV;
45 unsigned int max_uV;
Philipp Zabelb110a8f2009-05-28 07:15:16 +020046
Axel Lin4efd9df2012-11-29 13:19:43 +080047 unsigned int v3_curr_sel;
48 unsigned int v6_curr_sel;
49
Philipp Zabelb110a8f2009-05-28 07:15:16 +020050 struct regulator_dev *rdev[0];
51};
52
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020053/*
Axel Lin96d25222012-06-04 12:56:58 +080054 * V6 voltage
55 * On I2C bus, sending a "x" byte to the max1586 means :
56 * set V6 to either 0V, 1.8V, 2.5V, 3V depending on (x & 0x3)
57 * As regulator framework doesn't accept voltages to be 0V, we use 1uV.
58 */
Axel Lind67c42c2013-03-30 13:57:29 +080059static const unsigned int v6_voltages_uv[] = { 1, 1800000, 2500000, 3000000 };
Axel Lin96d25222012-06-04 12:56:58 +080060
61/*
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020062 * V3 voltage
63 * On I2C bus, sending a "x" byte to the max1586 means :
64 * set V3 to 0.700V + (x & 0x1f) * 0.025V
Philipp Zabelb110a8f2009-05-28 07:15:16 +020065 * This voltage can be increased by external resistors
66 * R24 and R25=100kOhm as described in the data sheet.
67 * The gain is approximately: 1 + R24/R25 + R24/185.5kOhm
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020068 */
Axel Lin4efd9df2012-11-29 13:19:43 +080069static int max1586_v3_get_voltage_sel(struct regulator_dev *rdev)
70{
71 struct max1586_data *max1586 = rdev_get_drvdata(rdev);
72
73 return max1586->v3_curr_sel;
74}
75
Axel Lin9b558952012-06-08 08:26:44 +080076static int max1586_v3_set_voltage_sel(struct regulator_dev *rdev,
77 unsigned selector)
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020078{
Philipp Zabelb110a8f2009-05-28 07:15:16 +020079 struct max1586_data *max1586 = rdev_get_drvdata(rdev);
80 struct i2c_client *client = max1586->client;
Axel Lin4efd9df2012-11-29 13:19:43 +080081 int ret;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020082 u8 v3_prog;
83
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020084 dev_dbg(&client->dev, "changing voltage v3 to %dmv\n",
Axel Lin9b558952012-06-08 08:26:44 +080085 regulator_list_voltage_linear(rdev, selector) / 1000);
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020086
Axel Lin9b558952012-06-08 08:26:44 +080087 v3_prog = I2C_V3_SELECT | (u8) selector;
Axel Lin4efd9df2012-11-29 13:19:43 +080088 ret = i2c_smbus_write_byte(client, v3_prog);
89 if (ret)
90 return ret;
91
92 max1586->v3_curr_sel = selector;
93
94 return 0;
95}
96
97static int max1586_v6_get_voltage_sel(struct regulator_dev *rdev)
98{
99 struct max1586_data *max1586 = rdev_get_drvdata(rdev);
100
101 return max1586->v6_curr_sel;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200102}
103
Axel Lin0d032732012-06-04 12:58:24 +0800104static int max1586_v6_set_voltage_sel(struct regulator_dev *rdev,
105 unsigned int selector)
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200106{
Axel Lin4efd9df2012-11-29 13:19:43 +0800107 struct max1586_data *max1586 = rdev_get_drvdata(rdev);
108 struct i2c_client *client = max1586->client;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200109 u8 v6_prog;
Axel Lin4efd9df2012-11-29 13:19:43 +0800110 int ret;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200111
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200112 dev_dbg(&client->dev, "changing voltage v6 to %dmv\n",
Axel Lin0d032732012-06-04 12:58:24 +0800113 rdev->desc->volt_table[selector] / 1000);
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200114
Axel Lin0d032732012-06-04 12:58:24 +0800115 v6_prog = I2C_V6_SELECT | (u8) selector;
Axel Lin4efd9df2012-11-29 13:19:43 +0800116 ret = i2c_smbus_write_byte(client, v6_prog);
117 if (ret)
118 return ret;
119
120 max1586->v6_curr_sel = selector;
121
122 return 0;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200123}
124
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200125/*
126 * The Maxim 1586 controls V3 and V6 voltages, but offers no way of reading back
127 * the set up value.
128 */
129static struct regulator_ops max1586_v3_ops = {
Axel Lin4efd9df2012-11-29 13:19:43 +0800130 .get_voltage_sel = max1586_v3_get_voltage_sel,
Axel Lin9b558952012-06-08 08:26:44 +0800131 .set_voltage_sel = max1586_v3_set_voltage_sel,
Axel Lin93f5de52012-06-08 08:25:41 +0800132 .list_voltage = regulator_list_voltage_linear,
Axel Lin9b558952012-06-08 08:26:44 +0800133 .map_voltage = regulator_map_voltage_linear,
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200134};
135
136static struct regulator_ops max1586_v6_ops = {
Axel Lin4efd9df2012-11-29 13:19:43 +0800137 .get_voltage_sel = max1586_v6_get_voltage_sel,
Axel Lin0d032732012-06-04 12:58:24 +0800138 .set_voltage_sel = max1586_v6_set_voltage_sel,
Axel Lin96d25222012-06-04 12:56:58 +0800139 .list_voltage = regulator_list_voltage_table,
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200140};
141
Axel Lin93f5de52012-06-08 08:25:41 +0800142static struct regulator_desc max1586_reg[] = {
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200143 {
144 .name = "Output_V3",
145 .id = MAX1586_V3,
146 .ops = &max1586_v3_ops,
147 .type = REGULATOR_VOLTAGE,
148 .n_voltages = MAX1586_V3_MAX_VSEL + 1,
149 .owner = THIS_MODULE,
150 },
151 {
152 .name = "Output_V6",
153 .id = MAX1586_V6,
154 .ops = &max1586_v6_ops,
155 .type = REGULATOR_VOLTAGE,
156 .n_voltages = MAX1586_V6_MAX_VSEL + 1,
Axel Lin96d25222012-06-04 12:56:58 +0800157 .volt_table = v6_voltages_uv,
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200158 .owner = THIS_MODULE,
159 },
160};
161
Bill Pembertona5023572012-11-19 13:22:22 -0500162static int max1586_pmic_probe(struct i2c_client *client,
Dmitry Torokhovbd88c9b2010-02-23 23:38:23 -0800163 const struct i2c_device_id *i2c_id)
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200164{
165 struct regulator_dev **rdev;
166 struct max1586_platform_data *pdata = client->dev.platform_data;
Mark Brownc1727082012-04-04 00:50:22 +0100167 struct regulator_config config = { };
Philipp Zabelb110a8f2009-05-28 07:15:16 +0200168 struct max1586_data *max1586;
169 int i, id, ret = -ENOMEM;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200170
Axel Linb7bd05b2012-04-11 23:06:47 +0800171 max1586 = devm_kzalloc(&client->dev, sizeof(struct max1586_data) +
Philipp Zabelb110a8f2009-05-28 07:15:16 +0200172 sizeof(struct regulator_dev *) * (MAX1586_V6 + 1),
173 GFP_KERNEL);
174 if (!max1586)
Axel Linb7bd05b2012-04-11 23:06:47 +0800175 return -ENOMEM;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200176
Philipp Zabelb110a8f2009-05-28 07:15:16 +0200177 max1586->client = client;
178
Axel Linb7bd05b2012-04-11 23:06:47 +0800179 if (!pdata->v3_gain)
180 return -EINVAL;
181
Philipp Zabelc8f1e502009-05-28 21:00:03 +0200182 max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * pdata->v3_gain / 1000;
183 max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * pdata->v3_gain / 1000;
Philipp Zabelb110a8f2009-05-28 07:15:16 +0200184
Axel Lin4efd9df2012-11-29 13:19:43 +0800185 /* Set curr_sel to default voltage on power-up */
186 max1586->v3_curr_sel = 24; /* 1.3V */
187 max1586->v6_curr_sel = 0;
188
Philipp Zabelb110a8f2009-05-28 07:15:16 +0200189 rdev = max1586->rdev;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200190 for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) {
191 id = pdata->subdevs[i].id;
192 if (!pdata->subdevs[i].platform_data)
193 continue;
194 if (id < MAX1586_V3 || id > MAX1586_V6) {
195 dev_err(&client->dev, "invalid regulator id %d\n", id);
196 goto err;
197 }
Mark Brownc1727082012-04-04 00:50:22 +0100198
Axel Lin93f5de52012-06-08 08:25:41 +0800199 if (id == MAX1586_V3) {
200 max1586_reg[id].min_uV = max1586->min_uV;
201 max1586_reg[id].uV_step =
202 (max1586->max_uV - max1586->min_uV) /
203 MAX1586_V3_MAX_VSEL;
204 }
205
Mark Brownc1727082012-04-04 00:50:22 +0100206 config.dev = &client->dev;
207 config.init_data = pdata->subdevs[i].platform_data;
208 config.driver_data = max1586;
209
210 rdev[i] = regulator_register(&max1586_reg[id], &config);
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200211 if (IS_ERR(rdev[i])) {
212 ret = PTR_ERR(rdev[i]);
213 dev_err(&client->dev, "failed to register %s\n",
214 max1586_reg[id].name);
215 goto err;
216 }
217 }
218
Axel Lin7c4c25e2010-08-06 13:33:15 +0800219 i2c_set_clientdata(client, max1586);
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200220 dev_info(&client->dev, "Maxim 1586 regulator driver loaded\n");
221 return 0;
222
223err:
224 while (--i >= 0)
225 regulator_unregister(rdev[i]);
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200226 return ret;
227}
228
Bill Pemberton8dc995f2012-11-19 13:26:10 -0500229static int max1586_pmic_remove(struct i2c_client *client)
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200230{
Axel Lin7c4c25e2010-08-06 13:33:15 +0800231 struct max1586_data *max1586 = i2c_get_clientdata(client);
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200232 int i;
233
234 for (i = 0; i <= MAX1586_V6; i++)
Axel Lin020501f2013-04-27 13:58:08 +0800235 regulator_unregister(max1586->rdev[i]);
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200236 return 0;
237}
238
239static const struct i2c_device_id max1586_id[] = {
240 { "max1586", 0 },
241 { }
242};
243MODULE_DEVICE_TABLE(i2c, max1586_id);
244
245static struct i2c_driver max1586_pmic_driver = {
246 .probe = max1586_pmic_probe,
Bill Pemberton5eb9f2b2012-11-19 13:20:42 -0500247 .remove = max1586_pmic_remove,
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200248 .driver = {
249 .name = "max1586",
Dmitry Torokhovbd88c9b2010-02-23 23:38:23 -0800250 .owner = THIS_MODULE,
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200251 },
252 .id_table = max1586_id,
253};
254
255static int __init max1586_pmic_init(void)
256{
257 return i2c_add_driver(&max1586_pmic_driver);
258}
259subsys_initcall(max1586_pmic_init);
260
261static void __exit max1586_pmic_exit(void)
262{
263 i2c_del_driver(&max1586_pmic_driver);
264}
265module_exit(max1586_pmic_exit);
266
267/* Module information */
268MODULE_DESCRIPTION("MAXIM 1586 voltage regulator driver");
269MODULE_AUTHOR("Robert Jarzmik");
270MODULE_LICENSE("GPL");