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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>
25#include <linux/regulator/max1586.h>
26
27#define MAX1586_V3_MAX_VSEL 31
28#define MAX1586_V6_MAX_VSEL 3
29
30#define MAX1586_V3_MIN_UV 700000
31#define MAX1586_V3_MAX_UV 1475000
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020032
33#define MAX1586_V6_MIN_UV 0
34#define MAX1586_V6_MAX_UV 3000000
35
36#define I2C_V3_SELECT (0 << 5)
37#define I2C_V6_SELECT (1 << 5)
38
Philipp Zabelb110a8f2009-05-28 07:15:16 +020039struct max1586_data {
40 struct i2c_client *client;
41
42 /* min/max V3 voltage */
Philipp Zabelc8f1e502009-05-28 21:00:03 +020043 unsigned int min_uV;
44 unsigned int max_uV;
Philipp Zabelb110a8f2009-05-28 07:15:16 +020045
46 struct regulator_dev *rdev[0];
47};
48
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020049/*
50 * V3 voltage
51 * On I2C bus, sending a "x" byte to the max1586 means :
52 * set V3 to 0.700V + (x & 0x1f) * 0.025V
Philipp Zabelb110a8f2009-05-28 07:15:16 +020053 * This voltage can be increased by external resistors
54 * R24 and R25=100kOhm as described in the data sheet.
55 * The gain is approximately: 1 + R24/R25 + R24/185.5kOhm
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020056 */
Philipp Zabelb110a8f2009-05-28 07:15:16 +020057static int max1586_v3_calc_voltage(struct max1586_data *max1586,
58 unsigned selector)
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020059{
Philipp Zabelb110a8f2009-05-28 07:15:16 +020060 unsigned range_uV = max1586->max_uV - max1586->min_uV;
61
62 return max1586->min_uV + (selector * range_uV / MAX1586_V3_MAX_VSEL);
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020063}
64
65static int max1586_v3_set(struct regulator_dev *rdev, int min_uV, int max_uV)
66{
Philipp Zabelb110a8f2009-05-28 07:15:16 +020067 struct max1586_data *max1586 = rdev_get_drvdata(rdev);
68 struct i2c_client *client = max1586->client;
69 unsigned range_uV = max1586->max_uV - max1586->min_uV;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020070 unsigned selector;
71 u8 v3_prog;
72
Philipp Zabelb110a8f2009-05-28 07:15:16 +020073 if (min_uV > max1586->max_uV || max_uV < max1586->min_uV)
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020074 return -EINVAL;
Philipp Zabelb110a8f2009-05-28 07:15:16 +020075 if (min_uV < max1586->min_uV)
76 min_uV = max1586->min_uV;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020077
Philipp Zabelb110a8f2009-05-28 07:15:16 +020078 selector = ((min_uV - max1586->min_uV) * MAX1586_V3_MAX_VSEL +
79 range_uV - 1) / range_uV;
80 if (max1586_v3_calc_voltage(max1586, selector) > max_uV)
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020081 return -EINVAL;
82
83 dev_dbg(&client->dev, "changing voltage v3 to %dmv\n",
Philipp Zabelb110a8f2009-05-28 07:15:16 +020084 max1586_v3_calc_voltage(max1586, selector) / 1000);
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020085
86 v3_prog = I2C_V3_SELECT | (u8) selector;
87 return i2c_smbus_write_byte(client, v3_prog);
88}
89
90static int max1586_v3_list(struct regulator_dev *rdev, unsigned selector)
91{
Philipp Zabelb110a8f2009-05-28 07:15:16 +020092 struct max1586_data *max1586 = rdev_get_drvdata(rdev);
93
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020094 if (selector > MAX1586_V3_MAX_VSEL)
95 return -EINVAL;
Philipp Zabelb110a8f2009-05-28 07:15:16 +020096 return max1586_v3_calc_voltage(max1586, selector);
Robert Jarzmik55f4fa42009-04-23 20:10:43 +020097}
98
99/*
100 * V6 voltage
101 * On I2C bus, sending a "x" byte to the max1586 means :
102 * set V6 to either 0V, 1.8V, 2.5V, 3V depending on (x & 0x3)
103 * As regulator framework doesn't accept voltages to be 0V, we use 1uV.
104 */
105static int max1586_v6_calc_voltage(unsigned selector)
106{
107 static int voltages_uv[] = { 1, 1800000, 2500000, 3000000 };
108
109 return voltages_uv[selector];
110}
111
112static int max1586_v6_set(struct regulator_dev *rdev, int min_uV, int max_uV)
113{
114 struct i2c_client *client = rdev_get_drvdata(rdev);
115 unsigned selector;
116 u8 v6_prog;
117
118 if (min_uV < MAX1586_V6_MIN_UV || min_uV > MAX1586_V6_MAX_UV)
119 return -EINVAL;
120 if (max_uV < MAX1586_V6_MIN_UV || max_uV > MAX1586_V6_MAX_UV)
121 return -EINVAL;
122
123 if (min_uV >= 3000000)
124 selector = 3;
125 if (min_uV < 3000000)
126 selector = 2;
127 if (min_uV < 2500000)
128 selector = 1;
129 if (min_uV < 1800000)
130 selector = 0;
131
132 if (max1586_v6_calc_voltage(selector) > max_uV)
133 return -EINVAL;
134
135 dev_dbg(&client->dev, "changing voltage v6 to %dmv\n",
136 max1586_v6_calc_voltage(selector) / 1000);
137
138 v6_prog = I2C_V6_SELECT | (u8) selector;
139 return i2c_smbus_write_byte(client, v6_prog);
140}
141
142static int max1586_v6_list(struct regulator_dev *rdev, unsigned selector)
143{
144 if (selector > MAX1586_V6_MAX_VSEL)
145 return -EINVAL;
146 return max1586_v6_calc_voltage(selector);
147}
148
149/*
150 * The Maxim 1586 controls V3 and V6 voltages, but offers no way of reading back
151 * the set up value.
152 */
153static struct regulator_ops max1586_v3_ops = {
154 .set_voltage = max1586_v3_set,
155 .list_voltage = max1586_v3_list,
156};
157
158static struct regulator_ops max1586_v6_ops = {
159 .set_voltage = max1586_v6_set,
160 .list_voltage = max1586_v6_list,
161};
162
163static struct regulator_desc max1586_reg[] = {
164 {
165 .name = "Output_V3",
166 .id = MAX1586_V3,
167 .ops = &max1586_v3_ops,
168 .type = REGULATOR_VOLTAGE,
169 .n_voltages = MAX1586_V3_MAX_VSEL + 1,
170 .owner = THIS_MODULE,
171 },
172 {
173 .name = "Output_V6",
174 .id = MAX1586_V6,
175 .ops = &max1586_v6_ops,
176 .type = REGULATOR_VOLTAGE,
177 .n_voltages = MAX1586_V6_MAX_VSEL + 1,
178 .owner = THIS_MODULE,
179 },
180};
181
182static int max1586_pmic_probe(struct i2c_client *client,
183 const struct i2c_device_id *i2c_id)
184{
185 struct regulator_dev **rdev;
186 struct max1586_platform_data *pdata = client->dev.platform_data;
Philipp Zabelb110a8f2009-05-28 07:15:16 +0200187 struct max1586_data *max1586;
188 int i, id, ret = -ENOMEM;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200189
Philipp Zabelb110a8f2009-05-28 07:15:16 +0200190 max1586 = kzalloc(sizeof(struct max1586_data) +
191 sizeof(struct regulator_dev *) * (MAX1586_V6 + 1),
192 GFP_KERNEL);
193 if (!max1586)
194 goto out;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200195
Philipp Zabelb110a8f2009-05-28 07:15:16 +0200196 max1586->client = client;
197
198 if (!pdata->v3_gain) {
199 ret = -EINVAL;
200 goto out_unmap;
201 }
Philipp Zabelc8f1e502009-05-28 21:00:03 +0200202 max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * pdata->v3_gain / 1000;
203 max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * pdata->v3_gain / 1000;
Philipp Zabelb110a8f2009-05-28 07:15:16 +0200204
205 rdev = max1586->rdev;
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200206 for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) {
207 id = pdata->subdevs[i].id;
208 if (!pdata->subdevs[i].platform_data)
209 continue;
210 if (id < MAX1586_V3 || id > MAX1586_V6) {
211 dev_err(&client->dev, "invalid regulator id %d\n", id);
212 goto err;
213 }
214 rdev[i] = regulator_register(&max1586_reg[id], &client->dev,
215 pdata->subdevs[i].platform_data,
Philipp Zabelb110a8f2009-05-28 07:15:16 +0200216 max1586);
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200217 if (IS_ERR(rdev[i])) {
218 ret = PTR_ERR(rdev[i]);
219 dev_err(&client->dev, "failed to register %s\n",
220 max1586_reg[id].name);
221 goto err;
222 }
223 }
224
225 i2c_set_clientdata(client, rdev);
226 dev_info(&client->dev, "Maxim 1586 regulator driver loaded\n");
227 return 0;
228
229err:
230 while (--i >= 0)
231 regulator_unregister(rdev[i]);
Philipp Zabelb110a8f2009-05-28 07:15:16 +0200232out_unmap:
233 kfree(max1586);
234out:
Robert Jarzmik55f4fa42009-04-23 20:10:43 +0200235 return ret;
236}
237
238static int max1586_pmic_remove(struct i2c_client *client)
239{
240 struct regulator_dev **rdev = i2c_get_clientdata(client);
241 int i;
242
243 for (i = 0; i <= MAX1586_V6; i++)
244 if (rdev[i])
245 regulator_unregister(rdev[i]);
246 kfree(rdev);
247 i2c_set_clientdata(client, NULL);
248
249 return 0;
250}
251
252static const struct i2c_device_id max1586_id[] = {
253 { "max1586", 0 },
254 { }
255};
256MODULE_DEVICE_TABLE(i2c, max1586_id);
257
258static struct i2c_driver max1586_pmic_driver = {
259 .probe = max1586_pmic_probe,
260 .remove = max1586_pmic_remove,
261 .driver = {
262 .name = "max1586",
263 },
264 .id_table = max1586_id,
265};
266
267static int __init max1586_pmic_init(void)
268{
269 return i2c_add_driver(&max1586_pmic_driver);
270}
271subsys_initcall(max1586_pmic_init);
272
273static void __exit max1586_pmic_exit(void)
274{
275 i2c_del_driver(&max1586_pmic_driver);
276}
277module_exit(max1586_pmic_exit);
278
279/* Module information */
280MODULE_DESCRIPTION("MAXIM 1586 voltage regulator driver");
281MODULE_AUTHOR("Robert Jarzmik");
282MODULE_LICENSE("GPL");