Commit | Line | Data |
---|---|---|
55f4fa4e RJ |
1 | /* |
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> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
55f4fa4e RJ |
26 | #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 | |
55f4fa4e RJ |
33 | |
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 | ||
b110a8fb PZ |
40 | struct max1586_data { |
41 | struct i2c_client *client; | |
42 | ||
43 | /* min/max V3 voltage */ | |
c8f1e502 PZ |
44 | unsigned int min_uV; |
45 | unsigned int max_uV; | |
b110a8fb PZ |
46 | |
47 | struct regulator_dev *rdev[0]; | |
48 | }; | |
49 | ||
96d25221 AL |
50 | /* |
51 | * V6 voltage | |
52 | * On I2C bus, sending a "x" byte to the max1586 means : | |
53 | * set V6 to either 0V, 1.8V, 2.5V, 3V depending on (x & 0x3) | |
54 | * As regulator framework doesn't accept voltages to be 0V, we use 1uV. | |
55 | */ | |
56 | static int v6_voltages_uv[] = { 1, 1800000, 2500000, 3000000 }; | |
57 | ||
55f4fa4e RJ |
58 | /* |
59 | * V3 voltage | |
60 | * On I2C bus, sending a "x" byte to the max1586 means : | |
61 | * set V3 to 0.700V + (x & 0x1f) * 0.025V | |
b110a8fb PZ |
62 | * This voltage can be increased by external resistors |
63 | * R24 and R25=100kOhm as described in the data sheet. | |
64 | * The gain is approximately: 1 + R24/R25 + R24/185.5kOhm | |
55f4fa4e | 65 | */ |
9b558950 AL |
66 | static int max1586_v3_set_voltage_sel(struct regulator_dev *rdev, |
67 | unsigned selector) | |
55f4fa4e | 68 | { |
b110a8fb PZ |
69 | struct max1586_data *max1586 = rdev_get_drvdata(rdev); |
70 | struct i2c_client *client = max1586->client; | |
55f4fa4e RJ |
71 | u8 v3_prog; |
72 | ||
55f4fa4e | 73 | dev_dbg(&client->dev, "changing voltage v3 to %dmv\n", |
9b558950 | 74 | regulator_list_voltage_linear(rdev, selector) / 1000); |
55f4fa4e | 75 | |
9b558950 | 76 | v3_prog = I2C_V3_SELECT | (u8) selector; |
55f4fa4e RJ |
77 | return i2c_smbus_write_byte(client, v3_prog); |
78 | } | |
79 | ||
0d032731 AL |
80 | static int max1586_v6_set_voltage_sel(struct regulator_dev *rdev, |
81 | unsigned int selector) | |
55f4fa4e RJ |
82 | { |
83 | struct i2c_client *client = rdev_get_drvdata(rdev); | |
55f4fa4e RJ |
84 | u8 v6_prog; |
85 | ||
55f4fa4e | 86 | dev_dbg(&client->dev, "changing voltage v6 to %dmv\n", |
0d032731 | 87 | rdev->desc->volt_table[selector] / 1000); |
55f4fa4e | 88 | |
0d032731 | 89 | v6_prog = I2C_V6_SELECT | (u8) selector; |
55f4fa4e RJ |
90 | return i2c_smbus_write_byte(client, v6_prog); |
91 | } | |
92 | ||
55f4fa4e RJ |
93 | /* |
94 | * The Maxim 1586 controls V3 and V6 voltages, but offers no way of reading back | |
95 | * the set up value. | |
96 | */ | |
97 | static struct regulator_ops max1586_v3_ops = { | |
9b558950 | 98 | .set_voltage_sel = max1586_v3_set_voltage_sel, |
93f5de5c | 99 | .list_voltage = regulator_list_voltage_linear, |
9b558950 | 100 | .map_voltage = regulator_map_voltage_linear, |
55f4fa4e RJ |
101 | }; |
102 | ||
103 | static struct regulator_ops max1586_v6_ops = { | |
0d032731 | 104 | .set_voltage_sel = max1586_v6_set_voltage_sel, |
96d25221 | 105 | .list_voltage = regulator_list_voltage_table, |
55f4fa4e RJ |
106 | }; |
107 | ||
93f5de5c | 108 | static struct regulator_desc max1586_reg[] = { |
55f4fa4e RJ |
109 | { |
110 | .name = "Output_V3", | |
111 | .id = MAX1586_V3, | |
112 | .ops = &max1586_v3_ops, | |
113 | .type = REGULATOR_VOLTAGE, | |
114 | .n_voltages = MAX1586_V3_MAX_VSEL + 1, | |
115 | .owner = THIS_MODULE, | |
116 | }, | |
117 | { | |
118 | .name = "Output_V6", | |
119 | .id = MAX1586_V6, | |
120 | .ops = &max1586_v6_ops, | |
121 | .type = REGULATOR_VOLTAGE, | |
122 | .n_voltages = MAX1586_V6_MAX_VSEL + 1, | |
96d25221 | 123 | .volt_table = v6_voltages_uv, |
55f4fa4e RJ |
124 | .owner = THIS_MODULE, |
125 | }, | |
126 | }; | |
127 | ||
bd88c9b2 DT |
128 | static int __devinit max1586_pmic_probe(struct i2c_client *client, |
129 | const struct i2c_device_id *i2c_id) | |
55f4fa4e RJ |
130 | { |
131 | struct regulator_dev **rdev; | |
132 | struct max1586_platform_data *pdata = client->dev.platform_data; | |
c172708d | 133 | struct regulator_config config = { }; |
b110a8fb PZ |
134 | struct max1586_data *max1586; |
135 | int i, id, ret = -ENOMEM; | |
136 | ||
b7bd05b8 | 137 | max1586 = devm_kzalloc(&client->dev, sizeof(struct max1586_data) + |
b110a8fb PZ |
138 | sizeof(struct regulator_dev *) * (MAX1586_V6 + 1), |
139 | GFP_KERNEL); | |
140 | if (!max1586) | |
b7bd05b8 | 141 | return -ENOMEM; |
55f4fa4e | 142 | |
b110a8fb | 143 | max1586->client = client; |
55f4fa4e | 144 | |
b7bd05b8 AL |
145 | if (!pdata->v3_gain) |
146 | return -EINVAL; | |
147 | ||
c8f1e502 PZ |
148 | max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * pdata->v3_gain / 1000; |
149 | max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * pdata->v3_gain / 1000; | |
b110a8fb PZ |
150 | |
151 | rdev = max1586->rdev; | |
55f4fa4e RJ |
152 | for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) { |
153 | id = pdata->subdevs[i].id; | |
154 | if (!pdata->subdevs[i].platform_data) | |
155 | continue; | |
156 | if (id < MAX1586_V3 || id > MAX1586_V6) { | |
157 | dev_err(&client->dev, "invalid regulator id %d\n", id); | |
158 | goto err; | |
159 | } | |
c172708d | 160 | |
93f5de5c AL |
161 | if (id == MAX1586_V3) { |
162 | max1586_reg[id].min_uV = max1586->min_uV; | |
163 | max1586_reg[id].uV_step = | |
164 | (max1586->max_uV - max1586->min_uV) / | |
165 | MAX1586_V3_MAX_VSEL; | |
166 | } | |
167 | ||
c172708d MB |
168 | config.dev = &client->dev; |
169 | config.init_data = pdata->subdevs[i].platform_data; | |
170 | config.driver_data = max1586; | |
171 | ||
172 | rdev[i] = regulator_register(&max1586_reg[id], &config); | |
55f4fa4e RJ |
173 | if (IS_ERR(rdev[i])) { |
174 | ret = PTR_ERR(rdev[i]); | |
175 | dev_err(&client->dev, "failed to register %s\n", | |
176 | max1586_reg[id].name); | |
177 | goto err; | |
178 | } | |
179 | } | |
180 | ||
7c4c25e4 | 181 | i2c_set_clientdata(client, max1586); |
55f4fa4e RJ |
182 | dev_info(&client->dev, "Maxim 1586 regulator driver loaded\n"); |
183 | return 0; | |
184 | ||
185 | err: | |
186 | while (--i >= 0) | |
187 | regulator_unregister(rdev[i]); | |
55f4fa4e RJ |
188 | return ret; |
189 | } | |
190 | ||
bd88c9b2 | 191 | static int __devexit max1586_pmic_remove(struct i2c_client *client) |
55f4fa4e | 192 | { |
7c4c25e4 | 193 | struct max1586_data *max1586 = i2c_get_clientdata(client); |
55f4fa4e RJ |
194 | int i; |
195 | ||
196 | for (i = 0; i <= MAX1586_V6; i++) | |
7c4c25e4 AL |
197 | if (max1586->rdev[i]) |
198 | regulator_unregister(max1586->rdev[i]); | |
55f4fa4e RJ |
199 | return 0; |
200 | } | |
201 | ||
202 | static const struct i2c_device_id max1586_id[] = { | |
203 | { "max1586", 0 }, | |
204 | { } | |
205 | }; | |
206 | MODULE_DEVICE_TABLE(i2c, max1586_id); | |
207 | ||
208 | static struct i2c_driver max1586_pmic_driver = { | |
209 | .probe = max1586_pmic_probe, | |
5eb9f2b9 | 210 | .remove = max1586_pmic_remove, |
55f4fa4e RJ |
211 | .driver = { |
212 | .name = "max1586", | |
bd88c9b2 | 213 | .owner = THIS_MODULE, |
55f4fa4e RJ |
214 | }, |
215 | .id_table = max1586_id, | |
216 | }; | |
217 | ||
218 | static int __init max1586_pmic_init(void) | |
219 | { | |
220 | return i2c_add_driver(&max1586_pmic_driver); | |
221 | } | |
222 | subsys_initcall(max1586_pmic_init); | |
223 | ||
224 | static void __exit max1586_pmic_exit(void) | |
225 | { | |
226 | i2c_del_driver(&max1586_pmic_driver); | |
227 | } | |
228 | module_exit(max1586_pmic_exit); | |
229 | ||
230 | /* Module information */ | |
231 | MODULE_DESCRIPTION("MAXIM 1586 voltage regulator driver"); | |
232 | MODULE_AUTHOR("Robert Jarzmik"); | |
233 | MODULE_LICENSE("GPL"); |