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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;
Philipp Zabelb110a8f2009-05-28 07:15:16 +020049};
50
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020051/*
Axel Lin96d25222012-06-04 12:56:58 +080052 * V6 voltage
53 * On I2C bus, sending a "x" byte to the max1586 means :
54 * set V6 to either 0V, 1.8V, 2.5V, 3V depending on (x & 0x3)
55 * As regulator framework doesn't accept voltages to be 0V, we use 1uV.
56 */
Axel Lind67c42c2013-03-30 13:57:29 +080057static const unsigned int v6_voltages_uv[] = { 1, 1800000, 2500000, 3000000 };
Axel Lin96d25222012-06-04 12:56:58 +080058
59/*
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020060 * V3 voltage
61 * On I2C bus, sending a "x" byte to the max1586 means :
62 * set V3 to 0.700V + (x & 0x1f) * 0.025V
Philipp Zabelb110a8f2009-05-28 07:15:16 +020063 * This voltage can be increased by external resistors
64 * R24 and R25=100kOhm as described in the data sheet.
65 * The gain is approximately: 1 + R24/R25 + R24/185.5kOhm
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020066 */
Axel Lin4efd9df2012-11-29 13:19:43 +080067static int max1586_v3_get_voltage_sel(struct regulator_dev *rdev)
68{
69 struct max1586_data *max1586 = rdev_get_drvdata(rdev);
70
71 return max1586->v3_curr_sel;
72}
73
Axel Lin9b558952012-06-08 08:26:44 +080074static int max1586_v3_set_voltage_sel(struct regulator_dev *rdev,
75 unsigned selector)
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020076{
Philipp Zabelb110a8f2009-05-28 07:15:16 +020077 struct max1586_data *max1586 = rdev_get_drvdata(rdev);
78 struct i2c_client *client = max1586->client;
Axel Lin4efd9df2012-11-29 13:19:43 +080079 int ret;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020080 u8 v3_prog;
81
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020082 dev_dbg(&client->dev, "changing voltage v3 to %dmv\n",
Axel Lin9b558952012-06-08 08:26:44 +080083 regulator_list_voltage_linear(rdev, selector) / 1000);
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020084
Axel Lin9b558952012-06-08 08:26:44 +080085 v3_prog = I2C_V3_SELECT | (u8) selector;
Axel Lin4efd9df2012-11-29 13:19:43 +080086 ret = i2c_smbus_write_byte(client, v3_prog);
87 if (ret)
88 return ret;
89
90 max1586->v3_curr_sel = selector;
91
92 return 0;
93}
94
95static int max1586_v6_get_voltage_sel(struct regulator_dev *rdev)
96{
97 struct max1586_data *max1586 = rdev_get_drvdata(rdev);
98
99 return max1586->v6_curr_sel;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200100}
101
Axel Lin0d032732012-06-04 12:58:24 +0800102static int max1586_v6_set_voltage_sel(struct regulator_dev *rdev,
103 unsigned int selector)
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200104{
Axel Lin4efd9df2012-11-29 13:19:43 +0800105 struct max1586_data *max1586 = rdev_get_drvdata(rdev);
106 struct i2c_client *client = max1586->client;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200107 u8 v6_prog;
Axel Lin4efd9df2012-11-29 13:19:43 +0800108 int ret;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200109
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200110 dev_dbg(&client->dev, "changing voltage v6 to %dmv\n",
Axel Lin0d032732012-06-04 12:58:24 +0800111 rdev->desc->volt_table[selector] / 1000);
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200112
Axel Lin0d032732012-06-04 12:58:24 +0800113 v6_prog = I2C_V6_SELECT | (u8) selector;
Axel Lin4efd9df2012-11-29 13:19:43 +0800114 ret = i2c_smbus_write_byte(client, v6_prog);
115 if (ret)
116 return ret;
117
118 max1586->v6_curr_sel = selector;
119
120 return 0;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200121}
122
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200123/*
124 * The Maxim 1586 controls V3 and V6 voltages, but offers no way of reading back
125 * the set up value.
126 */
127static struct regulator_ops max1586_v3_ops = {
Axel Lin4efd9df2012-11-29 13:19:43 +0800128 .get_voltage_sel = max1586_v3_get_voltage_sel,
Axel Lin9b558952012-06-08 08:26:44 +0800129 .set_voltage_sel = max1586_v3_set_voltage_sel,
Axel Lin93f5de52012-06-08 08:25:41 +0800130 .list_voltage = regulator_list_voltage_linear,
Axel Lin9b558952012-06-08 08:26:44 +0800131 .map_voltage = regulator_map_voltage_linear,
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200132};
133
134static struct regulator_ops max1586_v6_ops = {
Axel Lin4efd9df2012-11-29 13:19:43 +0800135 .get_voltage_sel = max1586_v6_get_voltage_sel,
Axel Lin0d032732012-06-04 12:58:24 +0800136 .set_voltage_sel = max1586_v6_set_voltage_sel,
Axel Lin96d25222012-06-04 12:56:58 +0800137 .list_voltage = regulator_list_voltage_table,
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200138};
139
Axel Lin93f5de52012-06-08 08:25:41 +0800140static struct regulator_desc max1586_reg[] = {
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200141 {
142 .name = "Output_V3",
143 .id = MAX1586_V3,
144 .ops = &max1586_v3_ops,
145 .type = REGULATOR_VOLTAGE,
146 .n_voltages = MAX1586_V3_MAX_VSEL + 1,
147 .owner = THIS_MODULE,
148 },
149 {
150 .name = "Output_V6",
151 .id = MAX1586_V6,
152 .ops = &max1586_v6_ops,
153 .type = REGULATOR_VOLTAGE,
154 .n_voltages = MAX1586_V6_MAX_VSEL + 1,
Axel Lin96d25222012-06-04 12:56:58 +0800155 .volt_table = v6_voltages_uv,
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200156 .owner = THIS_MODULE,
157 },
158};
159
Bill Pembertona5023572012-11-19 13:22:22 -0500160static int max1586_pmic_probe(struct i2c_client *client,
Dmitry Torokhovbd88c9b2010-02-23 23:38:23 -0800161 const struct i2c_device_id *i2c_id)
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200162{
Jingoo Handff91d02013-07-30 17:20:47 +0900163 struct max1586_platform_data *pdata = dev_get_platdata(&client->dev);
Mark Brownc1727082012-04-04 00:50:22 +0100164 struct regulator_config config = { };
Philipp Zabelb110a8f2009-05-28 07:15:16 +0200165 struct max1586_data *max1586;
Sachin Kamat249cc1f2013-09-04 11:07:55 +0530166 int i, id;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200167
Krzysztof Kozlowski2d45e782014-03-10 10:46:52 +0100168 max1586 = devm_kzalloc(&client->dev, sizeof(struct max1586_data),
Philipp Zabelb110a8f2009-05-28 07:15:16 +0200169 GFP_KERNEL);
170 if (!max1586)
Axel Linb7bd05b2012-04-11 23:06:47 +0800171 return -ENOMEM;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200172
Philipp Zabelb110a8f2009-05-28 07:15:16 +0200173 max1586->client = client;
174
Axel Linb7bd05b2012-04-11 23:06:47 +0800175 if (!pdata->v3_gain)
176 return -EINVAL;
177
Philipp Zabelc8f1e502009-05-28 21:00:03 +0200178 max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * pdata->v3_gain / 1000;
179 max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * pdata->v3_gain / 1000;
Philipp Zabelb110a8f2009-05-28 07:15:16 +0200180
Axel Lin4efd9df2012-11-29 13:19:43 +0800181 /* Set curr_sel to default voltage on power-up */
182 max1586->v3_curr_sel = 24; /* 1.3V */
183 max1586->v6_curr_sel = 0;
184
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200185 for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) {
Krzysztof Kozlowskiaaa46b42014-03-10 09:32:44 +0100186 struct regulator_dev *rdev;
187
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200188 id = pdata->subdevs[i].id;
189 if (!pdata->subdevs[i].platform_data)
190 continue;
191 if (id < MAX1586_V3 || id > MAX1586_V6) {
192 dev_err(&client->dev, "invalid regulator id %d\n", id);
Sachin Kamat249cc1f2013-09-04 11:07:55 +0530193 return -EINVAL;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200194 }
Mark Brownc1727082012-04-04 00:50:22 +0100195
Axel Lin93f5de52012-06-08 08:25:41 +0800196 if (id == MAX1586_V3) {
197 max1586_reg[id].min_uV = max1586->min_uV;
198 max1586_reg[id].uV_step =
199 (max1586->max_uV - max1586->min_uV) /
200 MAX1586_V3_MAX_VSEL;
201 }
202
Mark Brownc1727082012-04-04 00:50:22 +0100203 config.dev = &client->dev;
204 config.init_data = pdata->subdevs[i].platform_data;
205 config.driver_data = max1586;
206
Krzysztof Kozlowskiaaa46b42014-03-10 09:32:44 +0100207 rdev = devm_regulator_register(&client->dev,
Sachin Kamat249cc1f2013-09-04 11:07:55 +0530208 &max1586_reg[id], &config);
Krzysztof Kozlowskiaaa46b42014-03-10 09:32:44 +0100209 if (IS_ERR(rdev)) {
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200210 dev_err(&client->dev, "failed to register %s\n",
211 max1586_reg[id].name);
Krzysztof Kozlowskiaaa46b42014-03-10 09:32:44 +0100212 return PTR_ERR(rdev);
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200213 }
214 }
215
Axel Lin7c4c25e2010-08-06 13:33:15 +0800216 i2c_set_clientdata(client, max1586);
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200217 dev_info(&client->dev, "Maxim 1586 regulator driver loaded\n");
218 return 0;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200219}
220
221static const struct i2c_device_id max1586_id[] = {
222 { "max1586", 0 },
223 { }
224};
225MODULE_DEVICE_TABLE(i2c, max1586_id);
226
227static struct i2c_driver max1586_pmic_driver = {
228 .probe = max1586_pmic_probe,
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200229 .driver = {
230 .name = "max1586",
Dmitry Torokhovbd88c9b2010-02-23 23:38:23 -0800231 .owner = THIS_MODULE,
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200232 },
233 .id_table = max1586_id,
234};
235
236static int __init max1586_pmic_init(void)
237{
238 return i2c_add_driver(&max1586_pmic_driver);
239}
240subsys_initcall(max1586_pmic_init);
241
242static void __exit max1586_pmic_exit(void)
243{
244 i2c_del_driver(&max1586_pmic_driver);
245}
246module_exit(max1586_pmic_exit);
247
248/* Module information */
249MODULE_DESCRIPTION("MAXIM 1586 voltage regulator driver");
250MODULE_AUTHOR("Robert Jarzmik");
251MODULE_LICENSE("GPL");