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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 | ||
55f4fa4e RJ |
50 | /* |
51 | * V3 voltage | |
52 | * On I2C bus, sending a "x" byte to the max1586 means : | |
53 | * set V3 to 0.700V + (x & 0x1f) * 0.025V | |
b110a8fb PZ |
54 | * This voltage can be increased by external resistors |
55 | * R24 and R25=100kOhm as described in the data sheet. | |
56 | * The gain is approximately: 1 + R24/R25 + R24/185.5kOhm | |
55f4fa4e | 57 | */ |
b110a8fb PZ |
58 | static int max1586_v3_calc_voltage(struct max1586_data *max1586, |
59 | unsigned selector) | |
55f4fa4e | 60 | { |
b110a8fb PZ |
61 | unsigned range_uV = max1586->max_uV - max1586->min_uV; |
62 | ||
63 | return max1586->min_uV + (selector * range_uV / MAX1586_V3_MAX_VSEL); | |
55f4fa4e RJ |
64 | } |
65 | ||
66 | static int max1586_v3_set(struct regulator_dev *rdev, int min_uV, int max_uV) | |
67 | { | |
b110a8fb PZ |
68 | struct max1586_data *max1586 = rdev_get_drvdata(rdev); |
69 | struct i2c_client *client = max1586->client; | |
70 | unsigned range_uV = max1586->max_uV - max1586->min_uV; | |
55f4fa4e RJ |
71 | unsigned selector; |
72 | u8 v3_prog; | |
73 | ||
b110a8fb | 74 | if (min_uV > max1586->max_uV || max_uV < max1586->min_uV) |
55f4fa4e | 75 | return -EINVAL; |
b110a8fb PZ |
76 | if (min_uV < max1586->min_uV) |
77 | min_uV = max1586->min_uV; | |
55f4fa4e | 78 | |
b110a8fb PZ |
79 | selector = ((min_uV - max1586->min_uV) * MAX1586_V3_MAX_VSEL + |
80 | range_uV - 1) / range_uV; | |
81 | if (max1586_v3_calc_voltage(max1586, selector) > max_uV) | |
55f4fa4e RJ |
82 | return -EINVAL; |
83 | ||
84 | dev_dbg(&client->dev, "changing voltage v3 to %dmv\n", | |
b110a8fb | 85 | max1586_v3_calc_voltage(max1586, selector) / 1000); |
55f4fa4e RJ |
86 | |
87 | v3_prog = I2C_V3_SELECT | (u8) selector; | |
88 | return i2c_smbus_write_byte(client, v3_prog); | |
89 | } | |
90 | ||
91 | static int max1586_v3_list(struct regulator_dev *rdev, unsigned selector) | |
92 | { | |
b110a8fb PZ |
93 | struct max1586_data *max1586 = rdev_get_drvdata(rdev); |
94 | ||
55f4fa4e RJ |
95 | if (selector > MAX1586_V3_MAX_VSEL) |
96 | return -EINVAL; | |
b110a8fb | 97 | return max1586_v3_calc_voltage(max1586, selector); |
55f4fa4e RJ |
98 | } |
99 | ||
100 | /* | |
101 | * V6 voltage | |
102 | * On I2C bus, sending a "x" byte to the max1586 means : | |
103 | * set V6 to either 0V, 1.8V, 2.5V, 3V depending on (x & 0x3) | |
104 | * As regulator framework doesn't accept voltages to be 0V, we use 1uV. | |
105 | */ | |
106 | static int max1586_v6_calc_voltage(unsigned selector) | |
107 | { | |
108 | static int voltages_uv[] = { 1, 1800000, 2500000, 3000000 }; | |
109 | ||
110 | return voltages_uv[selector]; | |
111 | } | |
112 | ||
113 | static int max1586_v6_set(struct regulator_dev *rdev, int min_uV, int max_uV) | |
114 | { | |
115 | struct i2c_client *client = rdev_get_drvdata(rdev); | |
116 | unsigned selector; | |
117 | u8 v6_prog; | |
118 | ||
119 | if (min_uV < MAX1586_V6_MIN_UV || min_uV > MAX1586_V6_MAX_UV) | |
120 | return -EINVAL; | |
121 | if (max_uV < MAX1586_V6_MIN_UV || max_uV > MAX1586_V6_MAX_UV) | |
122 | return -EINVAL; | |
123 | ||
55f4fa4e RJ |
124 | if (min_uV < 1800000) |
125 | selector = 0; | |
3e352f9e AL |
126 | else if (min_uV < 2500000) |
127 | selector = 1; | |
128 | else if (min_uV < 3000000) | |
129 | selector = 2; | |
130 | else if (min_uV >= 3000000) | |
131 | selector = 3; | |
55f4fa4e RJ |
132 | |
133 | if (max1586_v6_calc_voltage(selector) > max_uV) | |
134 | return -EINVAL; | |
135 | ||
136 | dev_dbg(&client->dev, "changing voltage v6 to %dmv\n", | |
137 | max1586_v6_calc_voltage(selector) / 1000); | |
138 | ||
139 | v6_prog = I2C_V6_SELECT | (u8) selector; | |
140 | return i2c_smbus_write_byte(client, v6_prog); | |
141 | } | |
142 | ||
143 | static int max1586_v6_list(struct regulator_dev *rdev, unsigned selector) | |
144 | { | |
145 | if (selector > MAX1586_V6_MAX_VSEL) | |
146 | return -EINVAL; | |
147 | return max1586_v6_calc_voltage(selector); | |
148 | } | |
149 | ||
150 | /* | |
151 | * The Maxim 1586 controls V3 and V6 voltages, but offers no way of reading back | |
152 | * the set up value. | |
153 | */ | |
154 | static struct regulator_ops max1586_v3_ops = { | |
155 | .set_voltage = max1586_v3_set, | |
156 | .list_voltage = max1586_v3_list, | |
157 | }; | |
158 | ||
159 | static struct regulator_ops max1586_v6_ops = { | |
160 | .set_voltage = max1586_v6_set, | |
161 | .list_voltage = max1586_v6_list, | |
162 | }; | |
163 | ||
164 | static struct regulator_desc max1586_reg[] = { | |
165 | { | |
166 | .name = "Output_V3", | |
167 | .id = MAX1586_V3, | |
168 | .ops = &max1586_v3_ops, | |
169 | .type = REGULATOR_VOLTAGE, | |
170 | .n_voltages = MAX1586_V3_MAX_VSEL + 1, | |
171 | .owner = THIS_MODULE, | |
172 | }, | |
173 | { | |
174 | .name = "Output_V6", | |
175 | .id = MAX1586_V6, | |
176 | .ops = &max1586_v6_ops, | |
177 | .type = REGULATOR_VOLTAGE, | |
178 | .n_voltages = MAX1586_V6_MAX_VSEL + 1, | |
179 | .owner = THIS_MODULE, | |
180 | }, | |
181 | }; | |
182 | ||
bd88c9b2 DT |
183 | static int __devinit max1586_pmic_probe(struct i2c_client *client, |
184 | const struct i2c_device_id *i2c_id) | |
55f4fa4e RJ |
185 | { |
186 | struct regulator_dev **rdev; | |
187 | struct max1586_platform_data *pdata = client->dev.platform_data; | |
b110a8fb PZ |
188 | struct max1586_data *max1586; |
189 | int i, id, ret = -ENOMEM; | |
190 | ||
191 | max1586 = kzalloc(sizeof(struct max1586_data) + | |
192 | sizeof(struct regulator_dev *) * (MAX1586_V6 + 1), | |
193 | GFP_KERNEL); | |
194 | if (!max1586) | |
195 | goto out; | |
55f4fa4e | 196 | |
b110a8fb | 197 | max1586->client = client; |
55f4fa4e | 198 | |
b110a8fb PZ |
199 | if (!pdata->v3_gain) { |
200 | ret = -EINVAL; | |
201 | goto out_unmap; | |
202 | } | |
c8f1e502 PZ |
203 | max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * pdata->v3_gain / 1000; |
204 | max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * pdata->v3_gain / 1000; | |
b110a8fb PZ |
205 | |
206 | rdev = max1586->rdev; | |
55f4fa4e RJ |
207 | for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) { |
208 | id = pdata->subdevs[i].id; | |
209 | if (!pdata->subdevs[i].platform_data) | |
210 | continue; | |
211 | if (id < MAX1586_V3 || id > MAX1586_V6) { | |
212 | dev_err(&client->dev, "invalid regulator id %d\n", id); | |
213 | goto err; | |
214 | } | |
215 | rdev[i] = regulator_register(&max1586_reg[id], &client->dev, | |
216 | pdata->subdevs[i].platform_data, | |
b110a8fb | 217 | max1586); |
55f4fa4e RJ |
218 | if (IS_ERR(rdev[i])) { |
219 | ret = PTR_ERR(rdev[i]); | |
220 | dev_err(&client->dev, "failed to register %s\n", | |
221 | max1586_reg[id].name); | |
222 | goto err; | |
223 | } | |
224 | } | |
225 | ||
7c4c25e4 | 226 | i2c_set_clientdata(client, max1586); |
55f4fa4e RJ |
227 | dev_info(&client->dev, "Maxim 1586 regulator driver loaded\n"); |
228 | return 0; | |
229 | ||
230 | err: | |
231 | while (--i >= 0) | |
232 | regulator_unregister(rdev[i]); | |
b110a8fb PZ |
233 | out_unmap: |
234 | kfree(max1586); | |
235 | out: | |
55f4fa4e RJ |
236 | return ret; |
237 | } | |
238 | ||
bd88c9b2 | 239 | static int __devexit max1586_pmic_remove(struct i2c_client *client) |
55f4fa4e | 240 | { |
7c4c25e4 | 241 | struct max1586_data *max1586 = i2c_get_clientdata(client); |
55f4fa4e RJ |
242 | int i; |
243 | ||
244 | for (i = 0; i <= MAX1586_V6; i++) | |
7c4c25e4 AL |
245 | if (max1586->rdev[i]) |
246 | regulator_unregister(max1586->rdev[i]); | |
247 | kfree(max1586); | |
55f4fa4e RJ |
248 | |
249 | return 0; | |
250 | } | |
251 | ||
252 | static const struct i2c_device_id max1586_id[] = { | |
253 | { "max1586", 0 }, | |
254 | { } | |
255 | }; | |
256 | MODULE_DEVICE_TABLE(i2c, max1586_id); | |
257 | ||
258 | static struct i2c_driver max1586_pmic_driver = { | |
259 | .probe = max1586_pmic_probe, | |
bd88c9b2 | 260 | .remove = __devexit_p(max1586_pmic_remove), |
55f4fa4e RJ |
261 | .driver = { |
262 | .name = "max1586", | |
bd88c9b2 | 263 | .owner = THIS_MODULE, |
55f4fa4e RJ |
264 | }, |
265 | .id_table = max1586_id, | |
266 | }; | |
267 | ||
268 | static int __init max1586_pmic_init(void) | |
269 | { | |
270 | return i2c_add_driver(&max1586_pmic_driver); | |
271 | } | |
272 | subsys_initcall(max1586_pmic_init); | |
273 | ||
274 | static void __exit max1586_pmic_exit(void) | |
275 | { | |
276 | i2c_del_driver(&max1586_pmic_driver); | |
277 | } | |
278 | module_exit(max1586_pmic_exit); | |
279 | ||
280 | /* Module information */ | |
281 | MODULE_DESCRIPTION("MAXIM 1586 voltage regulator driver"); | |
282 | MODULE_AUTHOR("Robert Jarzmik"); | |
283 | MODULE_LICENSE("GPL"); |