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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * max8952.c - Voltage and current regulation for the Maxim 8952
4 *
5 * Copyright (C) 2010 Samsung Electronics
6 * MyungJoo Ham <myungjoo.ham@samsung.com>
7 */
8
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/i2c.h>
12#include <linux/err.h>
13#include <linux/platform_device.h>
14#include <linux/regulator/driver.h>
15#include <linux/regulator/max8952.h>
16#include <linux/gpio/consumer.h>
17#include <linux/io.h>
18#include <linux/of.h>
19#include <linux/regulator/of_regulator.h>
20#include <linux/slab.h>
21
22/* Registers */
23enum {
24 MAX8952_REG_MODE0,
25 MAX8952_REG_MODE1,
26 MAX8952_REG_MODE2,
27 MAX8952_REG_MODE3,
28 MAX8952_REG_CONTROL,
29 MAX8952_REG_SYNC,
30 MAX8952_REG_RAMP,
31 MAX8952_REG_CHIP_ID1,
32 MAX8952_REG_CHIP_ID2,
33};
34
35struct max8952_data {
36 struct i2c_client *client;
37 struct max8952_platform_data *pdata;
38 struct gpio_desc *vid0_gpiod;
39 struct gpio_desc *vid1_gpiod;
40 bool vid0;
41 bool vid1;
42};
43
44static int max8952_read_reg(struct max8952_data *max8952, u8 reg)
45{
46 int ret = i2c_smbus_read_byte_data(max8952->client, reg);
47
48 if (ret > 0)
49 ret &= 0xff;
50
51 return ret;
52}
53
54static int max8952_write_reg(struct max8952_data *max8952,
55 u8 reg, u8 value)
56{
57 return i2c_smbus_write_byte_data(max8952->client, reg, value);
58}
59
60static int max8952_list_voltage(struct regulator_dev *rdev,
61 unsigned int selector)
62{
63 struct max8952_data *max8952 = rdev_get_drvdata(rdev);
64
65 if (rdev_get_id(rdev) != 0)
66 return -EINVAL;
67
68 return (max8952->pdata->dvs_mode[selector] * 10 + 770) * 1000;
69}
70
71static int max8952_get_voltage_sel(struct regulator_dev *rdev)
72{
73 struct max8952_data *max8952 = rdev_get_drvdata(rdev);
74 u8 vid = 0;
75
76 if (max8952->vid0)
77 vid += 1;
78 if (max8952->vid1)
79 vid += 2;
80
81 return vid;
82}
83
84static int max8952_set_voltage_sel(struct regulator_dev *rdev,
85 unsigned selector)
86{
87 struct max8952_data *max8952 = rdev_get_drvdata(rdev);
88
89 if (!max8952->vid0_gpiod || !max8952->vid1_gpiod) {
90 /* DVS not supported */
91 return -EPERM;
92 }
93
94 max8952->vid0 = selector & 0x1;
95 max8952->vid1 = (selector >> 1) & 0x1;
96 gpiod_set_value(max8952->vid0_gpiod, max8952->vid0);
97 gpiod_set_value(max8952->vid1_gpiod, max8952->vid1);
98
99 return 0;
100}
101
102static const struct regulator_ops max8952_ops = {
103 .list_voltage = max8952_list_voltage,
104 .get_voltage_sel = max8952_get_voltage_sel,
105 .set_voltage_sel = max8952_set_voltage_sel,
106};
107
108static const struct regulator_desc regulator = {
109 .name = "MAX8952_VOUT",
110 .id = 0,
111 .n_voltages = MAX8952_NUM_DVS_MODE,
112 .ops = &max8952_ops,
113 .type = REGULATOR_VOLTAGE,
114 .owner = THIS_MODULE,
115};
116
117#ifdef CONFIG_OF
118static const struct of_device_id max8952_dt_match[] = {
119 { .compatible = "maxim,max8952" },
120 {},
121};
122MODULE_DEVICE_TABLE(of, max8952_dt_match);
123
124static struct max8952_platform_data *max8952_parse_dt(struct device *dev)
125{
126 struct max8952_platform_data *pd;
127 struct device_node *np = dev->of_node;
128 int ret;
129 int i;
130
131 pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
132 if (!pd)
133 return NULL;
134
135 if (of_property_read_u32(np, "max8952,default-mode", &pd->default_mode))
136 dev_warn(dev, "Default mode not specified, assuming 0\n");
137
138 ret = of_property_read_u32_array(np, "max8952,dvs-mode-microvolt",
139 pd->dvs_mode, ARRAY_SIZE(pd->dvs_mode));
140 if (ret) {
141 dev_err(dev, "max8952,dvs-mode-microvolt property not specified");
142 return NULL;
143 }
144
145 for (i = 0; i < ARRAY_SIZE(pd->dvs_mode); ++i) {
146 if (pd->dvs_mode[i] < 770000 || pd->dvs_mode[i] > 1400000) {
147 dev_err(dev, "DVS voltage %d out of range\n", i);
148 return NULL;
149 }
150 pd->dvs_mode[i] = (pd->dvs_mode[i] - 770000) / 10000;
151 }
152
153 if (of_property_read_u32(np, "max8952,sync-freq", &pd->sync_freq))
154 dev_warn(dev, "max8952,sync-freq property not specified, defaulting to 26MHz\n");
155
156 if (of_property_read_u32(np, "max8952,ramp-speed", &pd->ramp_speed))
157 dev_warn(dev, "max8952,ramp-speed property not specified, defaulting to 32mV/us\n");
158
159 pd->reg_data = of_get_regulator_init_data(dev, np, ®ulator);
160 if (!pd->reg_data) {
161 dev_err(dev, "Failed to parse regulator init data\n");
162 return NULL;
163 }
164
165 return pd;
166}
167#else
168static struct max8952_platform_data *max8952_parse_dt(struct device *dev)
169{
170 return NULL;
171}
172#endif
173
174static int max8952_pmic_probe(struct i2c_client *client)
175{
176 struct i2c_adapter *adapter = client->adapter;
177 struct max8952_platform_data *pdata = dev_get_platdata(&client->dev);
178 struct regulator_config config = { };
179 struct max8952_data *max8952;
180 struct regulator_dev *rdev;
181 struct gpio_desc *gpiod;
182 enum gpiod_flags gflags;
183
184 int ret = 0;
185
186 if (client->dev.of_node)
187 pdata = max8952_parse_dt(&client->dev);
188
189 if (!pdata) {
190 dev_err(&client->dev, "Require the platform data\n");
191 return -EINVAL;
192 }
193
194 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
195 return -EIO;
196
197 max8952 = devm_kzalloc(&client->dev, sizeof(struct max8952_data),
198 GFP_KERNEL);
199 if (!max8952)
200 return -ENOMEM;
201
202 max8952->client = client;
203 max8952->pdata = pdata;
204
205 config.dev = &client->dev;
206 config.init_data = pdata->reg_data;
207 config.driver_data = max8952;
208 config.of_node = client->dev.of_node;
209
210 if (pdata->reg_data->constraints.boot_on)
211 gflags = GPIOD_OUT_HIGH;
212 else
213 gflags = GPIOD_OUT_LOW;
214 gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE;
215 /*
216 * Do not use devm* here: the regulator core takes over the
217 * lifecycle management of the GPIO descriptor.
218 */
219 gpiod = gpiod_get_optional(&client->dev,
220 "max8952,en",
221 gflags);
222 if (IS_ERR(gpiod))
223 return PTR_ERR(gpiod);
224 if (gpiod)
225 config.ena_gpiod = gpiod;
226
227 rdev = devm_regulator_register(&client->dev, ®ulator, &config);
228 if (IS_ERR(rdev)) {
229 ret = PTR_ERR(rdev);
230 dev_err(&client->dev, "regulator init failed (%d)\n", ret);
231 return ret;
232 }
233
234 max8952->vid0 = pdata->default_mode & 0x1;
235 max8952->vid1 = (pdata->default_mode >> 1) & 0x1;
236
237 /* Fetch vid0 and vid1 GPIOs if available */
238 gflags = max8952->vid0 ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
239 max8952->vid0_gpiod = devm_gpiod_get_index_optional(&client->dev,
240 "max8952,vid",
241 0, gflags);
242 if (IS_ERR(max8952->vid0_gpiod))
243 return PTR_ERR(max8952->vid0_gpiod);
244 gflags = max8952->vid1 ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
245 max8952->vid1_gpiod = devm_gpiod_get_index_optional(&client->dev,
246 "max8952,vid",
247 1, gflags);
248 if (IS_ERR(max8952->vid1_gpiod))
249 return PTR_ERR(max8952->vid1_gpiod);
250
251 /* If either VID GPIO is missing just disable this */
252 if (!max8952->vid0_gpiod || !max8952->vid1_gpiod) {
253 dev_warn(&client->dev, "VID0/1 gpio invalid: "
254 "DVS not available.\n");
255 max8952->vid0 = 0;
256 max8952->vid1 = 0;
257 /* Make sure if we have any descriptors they get set to low */
258 if (max8952->vid0_gpiod)
259 gpiod_set_value(max8952->vid0_gpiod, 0);
260 if (max8952->vid1_gpiod)
261 gpiod_set_value(max8952->vid1_gpiod, 0);
262
263 /* Disable Pulldown of EN only */
264 max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x60);
265
266 dev_err(&client->dev, "DVS modes disabled because VID0 and VID1"
267 " do not have proper controls.\n");
268 } else {
269 /*
270 * Disable Pulldown on EN, VID0, VID1 to reduce
271 * leakage current of MAX8952 assuming that MAX8952
272 * is turned on (EN==1). Note that without having VID0/1
273 * properly connected, turning pulldown off can be
274 * problematic. Thus, turn this off only when they are
275 * controllable by GPIO.
276 */
277 max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x0);
278 }
279
280 max8952_write_reg(max8952, MAX8952_REG_MODE0,
281 (max8952_read_reg(max8952,
282 MAX8952_REG_MODE0) & 0xC0) |
283 (pdata->dvs_mode[0] & 0x3F));
284 max8952_write_reg(max8952, MAX8952_REG_MODE1,
285 (max8952_read_reg(max8952,
286 MAX8952_REG_MODE1) & 0xC0) |
287 (pdata->dvs_mode[1] & 0x3F));
288 max8952_write_reg(max8952, MAX8952_REG_MODE2,
289 (max8952_read_reg(max8952,
290 MAX8952_REG_MODE2) & 0xC0) |
291 (pdata->dvs_mode[2] & 0x3F));
292 max8952_write_reg(max8952, MAX8952_REG_MODE3,
293 (max8952_read_reg(max8952,
294 MAX8952_REG_MODE3) & 0xC0) |
295 (pdata->dvs_mode[3] & 0x3F));
296
297 max8952_write_reg(max8952, MAX8952_REG_SYNC,
298 (max8952_read_reg(max8952, MAX8952_REG_SYNC) & 0x3F) |
299 ((pdata->sync_freq & 0x3) << 6));
300 max8952_write_reg(max8952, MAX8952_REG_RAMP,
301 (max8952_read_reg(max8952, MAX8952_REG_RAMP) & 0x1F) |
302 ((pdata->ramp_speed & 0x7) << 5));
303
304 i2c_set_clientdata(client, max8952);
305
306 return 0;
307}
308
309static const struct i2c_device_id max8952_ids[] = {
310 { "max8952", 0 },
311 { },
312};
313MODULE_DEVICE_TABLE(i2c, max8952_ids);
314
315static struct i2c_driver max8952_pmic_driver = {
316 .probe_new = max8952_pmic_probe,
317 .driver = {
318 .name = "max8952",
319 .of_match_table = of_match_ptr(max8952_dt_match),
320 },
321 .id_table = max8952_ids,
322};
323
324static int __init max8952_pmic_init(void)
325{
326 return i2c_add_driver(&max8952_pmic_driver);
327}
328subsys_initcall(max8952_pmic_init);
329
330static void __exit max8952_pmic_exit(void)
331{
332 i2c_del_driver(&max8952_pmic_driver);
333}
334module_exit(max8952_pmic_exit);
335
336MODULE_DESCRIPTION("MAXIM 8952 voltage regulator driver");
337MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
338MODULE_LICENSE("GPL");
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>
29#include <linux/gpio.h>
30#include <linux/io.h>
31#include <linux/slab.h>
32
33/* Registers */
34enum {
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
46struct max8952_data {
47 struct i2c_client *client;
48 struct device *dev;
49 struct max8952_platform_data *pdata;
50 struct regulator_dev *rdev;
51
52 bool vid0;
53 bool vid1;
54 bool en;
55};
56
57static int max8952_read_reg(struct max8952_data *max8952, u8 reg)
58{
59 int ret = i2c_smbus_read_byte_data(max8952->client, reg);
60 if (ret > 0)
61 ret &= 0xff;
62
63 return ret;
64}
65
66static int max8952_write_reg(struct max8952_data *max8952,
67 u8 reg, u8 value)
68{
69 return i2c_smbus_write_byte_data(max8952->client, reg, value);
70}
71
72static int max8952_list_voltage(struct regulator_dev *rdev,
73 unsigned int selector)
74{
75 struct max8952_data *max8952 = rdev_get_drvdata(rdev);
76
77 if (rdev_get_id(rdev) != 0)
78 return -EINVAL;
79
80 return (max8952->pdata->dvs_mode[selector] * 10 + 770) * 1000;
81}
82
83static int max8952_is_enabled(struct regulator_dev *rdev)
84{
85 struct max8952_data *max8952 = rdev_get_drvdata(rdev);
86 return max8952->en;
87}
88
89static int max8952_enable(struct regulator_dev *rdev)
90{
91 struct max8952_data *max8952 = rdev_get_drvdata(rdev);
92
93 /* If not valid, assume "ALWAYS_HIGH" */
94 if (gpio_is_valid(max8952->pdata->gpio_en))
95 gpio_set_value(max8952->pdata->gpio_en, 1);
96
97 max8952->en = true;
98 return 0;
99}
100
101static int max8952_disable(struct regulator_dev *rdev)
102{
103 struct max8952_data *max8952 = rdev_get_drvdata(rdev);
104
105 /* If not valid, assume "ALWAYS_HIGH" -> not permitted */
106 if (gpio_is_valid(max8952->pdata->gpio_en))
107 gpio_set_value(max8952->pdata->gpio_en, 0);
108 else
109 return -EPERM;
110
111 max8952->en = false;
112 return 0;
113}
114
115static int max8952_get_voltage_sel(struct regulator_dev *rdev)
116{
117 struct max8952_data *max8952 = rdev_get_drvdata(rdev);
118 u8 vid = 0;
119
120 if (max8952->vid0)
121 vid += 1;
122 if (max8952->vid1)
123 vid += 2;
124
125 return vid;
126}
127
128static int max8952_set_voltage_sel(struct regulator_dev *rdev,
129 unsigned selector)
130{
131 struct max8952_data *max8952 = rdev_get_drvdata(rdev);
132
133 if (!gpio_is_valid(max8952->pdata->gpio_vid0) ||
134 !gpio_is_valid(max8952->pdata->gpio_vid1)) {
135 /* DVS not supported */
136 return -EPERM;
137 }
138
139 max8952->vid0 = selector & 0x1;
140 max8952->vid1 = (selector >> 1) & 0x1;
141 gpio_set_value(max8952->pdata->gpio_vid0, max8952->vid0);
142 gpio_set_value(max8952->pdata->gpio_vid1, max8952->vid1);
143
144 return 0;
145}
146
147static struct regulator_ops max8952_ops = {
148 .list_voltage = max8952_list_voltage,
149 .is_enabled = max8952_is_enabled,
150 .enable = max8952_enable,
151 .disable = max8952_disable,
152 .get_voltage_sel = max8952_get_voltage_sel,
153 .set_voltage_sel = max8952_set_voltage_sel,
154 .set_suspend_disable = max8952_disable,
155};
156
157static const struct regulator_desc regulator = {
158 .name = "MAX8952_VOUT",
159 .id = 0,
160 .n_voltages = MAX8952_NUM_DVS_MODE,
161 .ops = &max8952_ops,
162 .type = REGULATOR_VOLTAGE,
163 .owner = THIS_MODULE,
164};
165
166static int __devinit max8952_pmic_probe(struct i2c_client *client,
167 const struct i2c_device_id *i2c_id)
168{
169 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
170 struct max8952_platform_data *pdata = client->dev.platform_data;
171 struct regulator_config config = { };
172 struct max8952_data *max8952;
173
174 int ret = 0, err = 0;
175
176 if (!pdata) {
177 dev_err(&client->dev, "Require the platform data\n");
178 return -EINVAL;
179 }
180
181 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
182 return -EIO;
183
184 max8952 = devm_kzalloc(&client->dev, sizeof(struct max8952_data),
185 GFP_KERNEL);
186 if (!max8952)
187 return -ENOMEM;
188
189 max8952->client = client;
190 max8952->dev = &client->dev;
191 max8952->pdata = pdata;
192
193 config.dev = max8952->dev;
194 config.init_data = &pdata->reg_data;
195 config.driver_data = max8952;
196
197 max8952->rdev = regulator_register(®ulator, &config);
198
199 if (IS_ERR(max8952->rdev)) {
200 ret = PTR_ERR(max8952->rdev);
201 dev_err(max8952->dev, "regulator init failed (%d)\n", ret);
202 return ret;
203 }
204
205 max8952->en = !!(pdata->reg_data.constraints.boot_on);
206 max8952->vid0 = pdata->default_mode & 0x1;
207 max8952->vid1 = (pdata->default_mode >> 1) & 0x1;
208
209 if (gpio_is_valid(pdata->gpio_en)) {
210 if (!gpio_request(pdata->gpio_en, "MAX8952 EN"))
211 gpio_direction_output(pdata->gpio_en, max8952->en);
212 else
213 err = 1;
214 } else
215 err = 2;
216
217 if (err) {
218 dev_info(max8952->dev, "EN gpio invalid: assume that EN"
219 "is always High\n");
220 max8952->en = 1;
221 pdata->gpio_en = -1; /* Mark invalid */
222 }
223
224 err = 0;
225
226 if (gpio_is_valid(pdata->gpio_vid0) &&
227 gpio_is_valid(pdata->gpio_vid1)) {
228 if (!gpio_request(pdata->gpio_vid0, "MAX8952 VID0"))
229 gpio_direction_output(pdata->gpio_vid0,
230 (pdata->default_mode) & 0x1);
231 else
232 err = 1;
233
234 if (!gpio_request(pdata->gpio_vid1, "MAX8952 VID1"))
235 gpio_direction_output(pdata->gpio_vid1,
236 (pdata->default_mode >> 1) & 0x1);
237 else {
238 if (!err)
239 gpio_free(pdata->gpio_vid0);
240 err = 2;
241 }
242
243 } else
244 err = 3;
245
246 if (err) {
247 dev_warn(max8952->dev, "VID0/1 gpio invalid: "
248 "DVS not available.\n");
249 max8952->vid0 = 0;
250 max8952->vid1 = 0;
251 /* Mark invalid */
252 pdata->gpio_vid0 = -1;
253 pdata->gpio_vid1 = -1;
254
255 /* Disable Pulldown of EN only */
256 max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x60);
257
258 dev_err(max8952->dev, "DVS modes disabled because VID0 and VID1"
259 " do not have proper controls.\n");
260 } else {
261 /*
262 * Disable Pulldown on EN, VID0, VID1 to reduce
263 * leakage current of MAX8952 assuming that MAX8952
264 * is turned on (EN==1). Note that without having VID0/1
265 * properly connected, turning pulldown off can be
266 * problematic. Thus, turn this off only when they are
267 * controllable by GPIO.
268 */
269 max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x0);
270 }
271
272 max8952_write_reg(max8952, MAX8952_REG_MODE0,
273 (max8952_read_reg(max8952,
274 MAX8952_REG_MODE0) & 0xC0) |
275 (pdata->dvs_mode[0] & 0x3F));
276 max8952_write_reg(max8952, MAX8952_REG_MODE1,
277 (max8952_read_reg(max8952,
278 MAX8952_REG_MODE1) & 0xC0) |
279 (pdata->dvs_mode[1] & 0x3F));
280 max8952_write_reg(max8952, MAX8952_REG_MODE2,
281 (max8952_read_reg(max8952,
282 MAX8952_REG_MODE2) & 0xC0) |
283 (pdata->dvs_mode[2] & 0x3F));
284 max8952_write_reg(max8952, MAX8952_REG_MODE3,
285 (max8952_read_reg(max8952,
286 MAX8952_REG_MODE3) & 0xC0) |
287 (pdata->dvs_mode[3] & 0x3F));
288
289 max8952_write_reg(max8952, MAX8952_REG_SYNC,
290 (max8952_read_reg(max8952, MAX8952_REG_SYNC) & 0x3F) |
291 ((pdata->sync_freq & 0x3) << 6));
292 max8952_write_reg(max8952, MAX8952_REG_RAMP,
293 (max8952_read_reg(max8952, MAX8952_REG_RAMP) & 0x1F) |
294 ((pdata->ramp_speed & 0x7) << 5));
295
296 i2c_set_clientdata(client, max8952);
297
298 return 0;
299}
300
301static int __devexit max8952_pmic_remove(struct i2c_client *client)
302{
303 struct max8952_data *max8952 = i2c_get_clientdata(client);
304 struct max8952_platform_data *pdata = max8952->pdata;
305 struct regulator_dev *rdev = max8952->rdev;
306
307 regulator_unregister(rdev);
308
309 gpio_free(pdata->gpio_vid0);
310 gpio_free(pdata->gpio_vid1);
311 gpio_free(pdata->gpio_en);
312 return 0;
313}
314
315static const struct i2c_device_id max8952_ids[] = {
316 { "max8952", 0 },
317 { },
318};
319MODULE_DEVICE_TABLE(i2c, max8952_ids);
320
321static struct i2c_driver max8952_pmic_driver = {
322 .probe = max8952_pmic_probe,
323 .remove = __devexit_p(max8952_pmic_remove),
324 .driver = {
325 .name = "max8952",
326 },
327 .id_table = max8952_ids,
328};
329
330static int __init max8952_pmic_init(void)
331{
332 return i2c_add_driver(&max8952_pmic_driver);
333}
334subsys_initcall(max8952_pmic_init);
335
336static void __exit max8952_pmic_exit(void)
337{
338 i2c_del_driver(&max8952_pmic_driver);
339}
340module_exit(max8952_pmic_exit);
341
342MODULE_DESCRIPTION("MAXIM 8952 voltage regulator driver");
343MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
344MODULE_LICENSE("GPL");