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202f4f53 MH |
1 | /* |
2 | * max8952.c - Voltage and current regulation for the Maxim 8952 | |
3 | * | |
4 | * Copyright (C) 2010 Samsung Electronics | |
5 | * MyungJoo Ham <myungjoo.ham@samsung.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/i2c.h> | |
25 | #include <linux/err.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/regulator/driver.h> | |
28 | #include <linux/regulator/max8952.h> | |
202f4f53 MH |
29 | #include <linux/gpio.h> |
30 | #include <linux/io.h> | |
31 | #include <linux/slab.h> | |
32 | ||
33 | /* Registers */ | |
34 | enum { | |
35 | MAX8952_REG_MODE0, | |
36 | MAX8952_REG_MODE1, | |
37 | MAX8952_REG_MODE2, | |
38 | MAX8952_REG_MODE3, | |
39 | MAX8952_REG_CONTROL, | |
40 | MAX8952_REG_SYNC, | |
41 | MAX8952_REG_RAMP, | |
42 | MAX8952_REG_CHIP_ID1, | |
43 | MAX8952_REG_CHIP_ID2, | |
44 | }; | |
45 | ||
46 | struct max8952_data { | |
47 | struct i2c_client *client; | |
48 | struct device *dev; | |
202f4f53 MH |
49 | struct max8952_platform_data *pdata; |
50 | struct regulator_dev *rdev; | |
51 | ||
52 | bool vid0; | |
53 | bool vid1; | |
202f4f53 MH |
54 | }; |
55 | ||
56 | static int max8952_read_reg(struct max8952_data *max8952, u8 reg) | |
57 | { | |
58 | int ret = i2c_smbus_read_byte_data(max8952->client, reg); | |
59 | if (ret > 0) | |
60 | ret &= 0xff; | |
61 | ||
62 | return ret; | |
63 | } | |
64 | ||
65 | static int max8952_write_reg(struct max8952_data *max8952, | |
66 | u8 reg, u8 value) | |
67 | { | |
68 | return i2c_smbus_write_byte_data(max8952->client, reg, value); | |
69 | } | |
70 | ||
202f4f53 MH |
71 | static int max8952_list_voltage(struct regulator_dev *rdev, |
72 | unsigned int selector) | |
73 | { | |
74 | struct max8952_data *max8952 = rdev_get_drvdata(rdev); | |
75 | ||
76 | if (rdev_get_id(rdev) != 0) | |
77 | return -EINVAL; | |
78 | ||
b9b49af5 | 79 | return (max8952->pdata->dvs_mode[selector] * 10 + 770) * 1000; |
202f4f53 MH |
80 | } |
81 | ||
b9b49af5 | 82 | static int max8952_get_voltage_sel(struct regulator_dev *rdev) |
202f4f53 MH |
83 | { |
84 | struct max8952_data *max8952 = rdev_get_drvdata(rdev); | |
85 | u8 vid = 0; | |
86 | ||
87 | if (max8952->vid0) | |
88 | vid += 1; | |
89 | if (max8952->vid1) | |
90 | vid += 2; | |
91 | ||
b9b49af5 | 92 | return vid; |
202f4f53 MH |
93 | } |
94 | ||
6ea67d04 AL |
95 | static int max8952_set_voltage_sel(struct regulator_dev *rdev, |
96 | unsigned selector) | |
202f4f53 MH |
97 | { |
98 | struct max8952_data *max8952 = rdev_get_drvdata(rdev); | |
202f4f53 MH |
99 | |
100 | if (!gpio_is_valid(max8952->pdata->gpio_vid0) || | |
e2cf3137 | 101 | !gpio_is_valid(max8952->pdata->gpio_vid1)) { |
202f4f53 MH |
102 | /* DVS not supported */ |
103 | return -EPERM; | |
104 | } | |
105 | ||
6ea67d04 AL |
106 | max8952->vid0 = selector & 0x1; |
107 | max8952->vid1 = (selector >> 1) & 0x1; | |
108 | gpio_set_value(max8952->pdata->gpio_vid0, max8952->vid0); | |
109 | gpio_set_value(max8952->pdata->gpio_vid1, max8952->vid1); | |
202f4f53 MH |
110 | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static struct regulator_ops max8952_ops = { | |
115 | .list_voltage = max8952_list_voltage, | |
b9b49af5 | 116 | .get_voltage_sel = max8952_get_voltage_sel, |
6ea67d04 | 117 | .set_voltage_sel = max8952_set_voltage_sel, |
202f4f53 MH |
118 | }; |
119 | ||
bd6ff0d6 | 120 | static const struct regulator_desc regulator = { |
202f4f53 MH |
121 | .name = "MAX8952_VOUT", |
122 | .id = 0, | |
123 | .n_voltages = MAX8952_NUM_DVS_MODE, | |
124 | .ops = &max8952_ops, | |
125 | .type = REGULATOR_VOLTAGE, | |
126 | .owner = THIS_MODULE, | |
127 | }; | |
128 | ||
a5023574 | 129 | static int max8952_pmic_probe(struct i2c_client *client, |
202f4f53 MH |
130 | const struct i2c_device_id *i2c_id) |
131 | { | |
132 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
133 | struct max8952_platform_data *pdata = client->dev.platform_data; | |
c172708d | 134 | struct regulator_config config = { }; |
202f4f53 MH |
135 | struct max8952_data *max8952; |
136 | ||
137 | int ret = 0, err = 0; | |
138 | ||
139 | if (!pdata) { | |
140 | dev_err(&client->dev, "Require the platform data\n"); | |
141 | return -EINVAL; | |
142 | } | |
143 | ||
144 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) | |
145 | return -EIO; | |
146 | ||
372de4aa AL |
147 | max8952 = devm_kzalloc(&client->dev, sizeof(struct max8952_data), |
148 | GFP_KERNEL); | |
202f4f53 MH |
149 | if (!max8952) |
150 | return -ENOMEM; | |
151 | ||
152 | max8952->client = client; | |
153 | max8952->dev = &client->dev; | |
154 | max8952->pdata = pdata; | |
202f4f53 | 155 | |
c172708d MB |
156 | config.dev = max8952->dev; |
157 | config.init_data = &pdata->reg_data; | |
158 | config.driver_data = max8952; | |
159 | ||
b669e0ad AL |
160 | config.ena_gpio = pdata->gpio_en; |
161 | if (pdata->reg_data.constraints.boot_on) | |
162 | config.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; | |
163 | ||
c172708d | 164 | max8952->rdev = regulator_register(®ulator, &config); |
202f4f53 | 165 | |
da05738e AL |
166 | if (IS_ERR(max8952->rdev)) { |
167 | ret = PTR_ERR(max8952->rdev); | |
202f4f53 | 168 | dev_err(max8952->dev, "regulator init failed (%d)\n", ret); |
372de4aa | 169 | return ret; |
da05738e | 170 | } |
202f4f53 | 171 | |
c8237f01 AL |
172 | max8952->vid0 = pdata->default_mode & 0x1; |
173 | max8952->vid1 = (pdata->default_mode >> 1) & 0x1; | |
202f4f53 | 174 | |
202f4f53 MH |
175 | if (gpio_is_valid(pdata->gpio_vid0) && |
176 | gpio_is_valid(pdata->gpio_vid1)) { | |
177 | if (!gpio_request(pdata->gpio_vid0, "MAX8952 VID0")) | |
178 | gpio_direction_output(pdata->gpio_vid0, | |
c8237f01 | 179 | (pdata->default_mode) & 0x1); |
202f4f53 MH |
180 | else |
181 | err = 1; | |
182 | ||
183 | if (!gpio_request(pdata->gpio_vid1, "MAX8952 VID1")) | |
184 | gpio_direction_output(pdata->gpio_vid1, | |
c8237f01 | 185 | (pdata->default_mode >> 1) & 0x1); |
202f4f53 MH |
186 | else { |
187 | if (!err) | |
188 | gpio_free(pdata->gpio_vid0); | |
189 | err = 2; | |
190 | } | |
191 | ||
192 | } else | |
193 | err = 3; | |
194 | ||
195 | if (err) { | |
196 | dev_warn(max8952->dev, "VID0/1 gpio invalid: " | |
25985edc | 197 | "DVS not available.\n"); |
202f4f53 MH |
198 | max8952->vid0 = 0; |
199 | max8952->vid1 = 0; | |
200 | /* Mark invalid */ | |
201 | pdata->gpio_vid0 = -1; | |
202 | pdata->gpio_vid1 = -1; | |
203 | ||
204 | /* Disable Pulldown of EN only */ | |
205 | max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x60); | |
206 | ||
207 | dev_err(max8952->dev, "DVS modes disabled because VID0 and VID1" | |
208 | " do not have proper controls.\n"); | |
209 | } else { | |
210 | /* | |
211 | * Disable Pulldown on EN, VID0, VID1 to reduce | |
212 | * leakage current of MAX8952 assuming that MAX8952 | |
213 | * is turned on (EN==1). Note that without having VID0/1 | |
214 | * properly connected, turning pulldown off can be | |
215 | * problematic. Thus, turn this off only when they are | |
216 | * controllable by GPIO. | |
217 | */ | |
218 | max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x0); | |
219 | } | |
220 | ||
221 | max8952_write_reg(max8952, MAX8952_REG_MODE0, | |
222 | (max8952_read_reg(max8952, | |
223 | MAX8952_REG_MODE0) & 0xC0) | | |
224 | (pdata->dvs_mode[0] & 0x3F)); | |
225 | max8952_write_reg(max8952, MAX8952_REG_MODE1, | |
226 | (max8952_read_reg(max8952, | |
227 | MAX8952_REG_MODE1) & 0xC0) | | |
228 | (pdata->dvs_mode[1] & 0x3F)); | |
229 | max8952_write_reg(max8952, MAX8952_REG_MODE2, | |
230 | (max8952_read_reg(max8952, | |
231 | MAX8952_REG_MODE2) & 0xC0) | | |
232 | (pdata->dvs_mode[2] & 0x3F)); | |
233 | max8952_write_reg(max8952, MAX8952_REG_MODE3, | |
234 | (max8952_read_reg(max8952, | |
235 | MAX8952_REG_MODE3) & 0xC0) | | |
236 | (pdata->dvs_mode[3] & 0x3F)); | |
237 | ||
238 | max8952_write_reg(max8952, MAX8952_REG_SYNC, | |
239 | (max8952_read_reg(max8952, MAX8952_REG_SYNC) & 0x3F) | | |
240 | ((pdata->sync_freq & 0x3) << 6)); | |
241 | max8952_write_reg(max8952, MAX8952_REG_RAMP, | |
242 | (max8952_read_reg(max8952, MAX8952_REG_RAMP) & 0x1F) | | |
243 | ((pdata->ramp_speed & 0x7) << 5)); | |
244 | ||
245 | i2c_set_clientdata(client, max8952); | |
246 | ||
da05738e | 247 | return 0; |
202f4f53 MH |
248 | } |
249 | ||
8dc995f5 | 250 | static int max8952_pmic_remove(struct i2c_client *client) |
202f4f53 MH |
251 | { |
252 | struct max8952_data *max8952 = i2c_get_clientdata(client); | |
253 | struct max8952_platform_data *pdata = max8952->pdata; | |
254 | struct regulator_dev *rdev = max8952->rdev; | |
255 | ||
256 | regulator_unregister(rdev); | |
257 | ||
258 | gpio_free(pdata->gpio_vid0); | |
259 | gpio_free(pdata->gpio_vid1); | |
202f4f53 MH |
260 | return 0; |
261 | } | |
262 | ||
263 | static const struct i2c_device_id max8952_ids[] = { | |
264 | { "max8952", 0 }, | |
265 | { }, | |
266 | }; | |
267 | MODULE_DEVICE_TABLE(i2c, max8952_ids); | |
268 | ||
269 | static struct i2c_driver max8952_pmic_driver = { | |
270 | .probe = max8952_pmic_probe, | |
5eb9f2b9 | 271 | .remove = max8952_pmic_remove, |
202f4f53 MH |
272 | .driver = { |
273 | .name = "max8952", | |
274 | }, | |
275 | .id_table = max8952_ids, | |
276 | }; | |
277 | ||
278 | static int __init max8952_pmic_init(void) | |
279 | { | |
280 | return i2c_add_driver(&max8952_pmic_driver); | |
281 | } | |
282 | subsys_initcall(max8952_pmic_init); | |
283 | ||
284 | static void __exit max8952_pmic_exit(void) | |
285 | { | |
286 | i2c_del_driver(&max8952_pmic_driver); | |
287 | } | |
288 | module_exit(max8952_pmic_exit); | |
289 | ||
290 | MODULE_DESCRIPTION("MAXIM 8952 voltage regulator driver"); | |
291 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
292 | MODULE_LICENSE("GPL"); |