Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/regulator/max8925-regulator.c

  1 /*
  2  * Regulators driver for Maxim max8925
  3  *
  4  * Copyright (C) 2009 Marvell International Ltd.
  5  *      Haojian Zhuang <haojian.zhuang@marvell.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 version 2 as
  9  * published by the Free Software Foundation.
 10  */
 11 #include <linux/kernel.h>
 12 #include <linux/module.h>
 13 #include <linux/init.h>
 14 #include <linux/err.h>
 15 #include <linux/i2c.h>
 16 #include <linux/platform_device.h>
 17 #include <linux/regulator/driver.h>
 18 #include <linux/regulator/machine.h>
 19 #include <linux/mfd/max8925.h>
 20 #include <linux/of.h>
 21 #include <linux/regulator/of_regulator.h>
 22 
 23 #define SD1_DVM_VMIN            850000
 24 #define SD1_DVM_VMAX            1000000
 25 #define SD1_DVM_STEP            50000
 26 #define SD1_DVM_SHIFT           5               /* SDCTL1 bit5 */
 27 #define SD1_DVM_EN              6               /* SDV1 bit 6 */
 28 
 29 /* bit definitions in LDO control registers */
 30 #define LDO_SEQ_I2C             0x7             /* Power U/D by i2c */
 31 #define LDO_SEQ_MASK            0x7             /* Power U/D sequence mask */
 32 #define LDO_SEQ_SHIFT           2               /* Power U/D sequence offset */
 33 #define LDO_I2C_EN              0x1             /* Enable by i2c */
 34 #define LDO_I2C_EN_MASK         0x1             /* Enable mask by i2c */
 35 #define LDO_I2C_EN_SHIFT        0               /* Enable offset by i2c */
 36 
 37 struct max8925_regulator_info {
 38         struct regulator_desc   desc;
 39         struct i2c_client       *i2c;
 40 
 41         int     vol_reg;
 42         int     enable_reg;
 43 };
 44 
 45 static int max8925_set_voltage_sel(struct regulator_dev *rdev,
 46                                    unsigned int selector)
 47 {
 48         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 49         unsigned char mask = rdev->desc->n_voltages - 1;
 50 
 51         return max8925_set_bits(info->i2c, info->vol_reg, mask, selector);
 52 }
 53 
 54 static int max8925_get_voltage_sel(struct regulator_dev *rdev)
 55 {
 56         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 57         unsigned char data, mask;
 58         int ret;
 59 
 60         ret = max8925_reg_read(info->i2c, info->vol_reg);
 61         if (ret < 0)
 62                 return ret;
 63         mask = rdev->desc->n_voltages - 1;
 64         data = ret & mask;
 65 
 66         return data;
 67 }
 68 
 69 static int max8925_enable(struct regulator_dev *rdev)
 70 {
 71         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 72 
 73         return max8925_set_bits(info->i2c, info->enable_reg,
 74                                 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
 75                                 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
 76                                 LDO_SEQ_I2C << LDO_SEQ_SHIFT |
 77                                 LDO_I2C_EN << LDO_I2C_EN_SHIFT);
 78 }
 79 
 80 static int max8925_disable(struct regulator_dev *rdev)
 81 {
 82         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 83 
 84         return max8925_set_bits(info->i2c, info->enable_reg,
 85                                 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
 86                                 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
 87                                 LDO_SEQ_I2C << LDO_SEQ_SHIFT);
 88 }
 89 
 90 static int max8925_is_enabled(struct regulator_dev *rdev)
 91 {
 92         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 93         int ldo_seq, ret;
 94 
 95         ret = max8925_reg_read(info->i2c, info->enable_reg);
 96         if (ret < 0)
 97                 return ret;
 98         ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
 99         if (ldo_seq != LDO_SEQ_I2C)
100                 return 1;
101         else
102                 return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
103 }
104 
105 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
106 {
107         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
108         unsigned char data, mask;
109 
110         if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
111                 return -EINVAL;
112 
113         data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
114         data <<= SD1_DVM_SHIFT;
115         mask = 3 << SD1_DVM_SHIFT;
116 
117         return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
118 }
119 
120 static int max8925_set_dvm_enable(struct regulator_dev *rdev)
121 {
122         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
123 
124         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
125                                 1 << SD1_DVM_EN);
126 }
127 
128 static int max8925_set_dvm_disable(struct regulator_dev *rdev)
129 {
130         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
131 
132         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
133 }
134 
135 static struct regulator_ops max8925_regulator_sdv_ops = {
136         .map_voltage            = regulator_map_voltage_linear,
137         .list_voltage           = regulator_list_voltage_linear,
138         .set_voltage_sel        = max8925_set_voltage_sel,
139         .get_voltage_sel        = max8925_get_voltage_sel,
140         .enable                 = max8925_enable,
141         .disable                = max8925_disable,
142         .is_enabled             = max8925_is_enabled,
143         .set_suspend_voltage    = max8925_set_dvm_voltage,
144         .set_suspend_enable     = max8925_set_dvm_enable,
145         .set_suspend_disable    = max8925_set_dvm_disable,
146 };
147 
148 static struct regulator_ops max8925_regulator_ldo_ops = {
149         .map_voltage            = regulator_map_voltage_linear,
150         .list_voltage           = regulator_list_voltage_linear,
151         .set_voltage_sel        = max8925_set_voltage_sel,
152         .get_voltage_sel        = max8925_get_voltage_sel,
153         .enable                 = max8925_enable,
154         .disable                = max8925_disable,
155         .is_enabled             = max8925_is_enabled,
156 };
157 
158 #define MAX8925_SDV(_id, min, max, step)                        \
159 {                                                               \
160         .desc   = {                                             \
161                 .name   = "SDV" #_id,                           \
162                 .ops    = &max8925_regulator_sdv_ops,           \
163                 .type   = REGULATOR_VOLTAGE,                    \
164                 .id     = MAX8925_ID_SD##_id,                   \
165                 .owner  = THIS_MODULE,                          \
166                 .n_voltages = 64,                               \
167                 .min_uV = min * 1000,                           \
168                 .uV_step = step * 1000,                         \
169         },                                                      \
170         .vol_reg        = MAX8925_SDV##_id,                     \
171         .enable_reg     = MAX8925_SDCTL##_id,                   \
172 }
173 
174 #define MAX8925_LDO(_id, min, max, step)                        \
175 {                                                               \
176         .desc   = {                                             \
177                 .name   = "LDO" #_id,                           \
178                 .ops    = &max8925_regulator_ldo_ops,           \
179                 .type   = REGULATOR_VOLTAGE,                    \
180                 .id     = MAX8925_ID_LDO##_id,                  \
181                 .owner  = THIS_MODULE,                          \
182                 .n_voltages = 64,                               \
183                 .min_uV = min * 1000,                           \
184                 .uV_step = step * 1000,                         \
185         },                                                      \
186         .vol_reg        = MAX8925_LDOVOUT##_id,                 \
187         .enable_reg     = MAX8925_LDOCTL##_id,                  \
188 }
189 
190 #ifdef CONFIG_OF
191 static struct of_regulator_match max8925_regulator_matches[] = {
192         { .name = "SDV1",},
193         { .name = "SDV2",},
194         { .name = "SDV3",},
195         { .name = "LDO1",},
196         { .name = "LDO2",},
197         { .name = "LDO3",},
198         { .name = "LDO4",},
199         { .name = "LDO5",},
200         { .name = "LDO6",},
201         { .name = "LDO7",},
202         { .name = "LDO8",},
203         { .name = "LDO9",},
204         { .name = "LDO10",},
205         { .name = "LDO11",},
206         { .name = "LDO12",},
207         { .name = "LDO13",},
208         { .name = "LDO14",},
209         { .name = "LDO15",},
210         { .name = "LDO16",},
211         { .name = "LDO17",},
212         { .name = "LDO18",},
213         { .name = "LDO19",},
214         { .name = "LDO20",},
215 };
216 #endif
217 
218 static struct max8925_regulator_info max8925_regulator_info[] = {
219         MAX8925_SDV(1, 637.5, 1425, 12.5),
220         MAX8925_SDV(2,   650, 2225,   25),
221         MAX8925_SDV(3,   750, 3900,   50),
222 
223         MAX8925_LDO(1,  750, 3900, 50),
224         MAX8925_LDO(2,  650, 2250, 25),
225         MAX8925_LDO(3,  650, 2250, 25),
226         MAX8925_LDO(4,  750, 3900, 50),
227         MAX8925_LDO(5,  750, 3900, 50),
228         MAX8925_LDO(6,  750, 3900, 50),
229         MAX8925_LDO(7,  750, 3900, 50),
230         MAX8925_LDO(8,  750, 3900, 50),
231         MAX8925_LDO(9,  750, 3900, 50),
232         MAX8925_LDO(10, 750, 3900, 50),
233         MAX8925_LDO(11, 750, 3900, 50),
234         MAX8925_LDO(12, 750, 3900, 50),
235         MAX8925_LDO(13, 750, 3900, 50),
236         MAX8925_LDO(14, 750, 3900, 50),
237         MAX8925_LDO(15, 750, 3900, 50),
238         MAX8925_LDO(16, 750, 3900, 50),
239         MAX8925_LDO(17, 650, 2250, 25),
240         MAX8925_LDO(18, 650, 2250, 25),
241         MAX8925_LDO(19, 750, 3900, 50),
242         MAX8925_LDO(20, 750, 3900, 50),
243 };
244 
245 #ifdef CONFIG_OF
246 static int max8925_regulator_dt_init(struct platform_device *pdev,
247                                     struct regulator_config *config,
248                                     int ridx)
249 {
250         struct device_node *nproot, *np;
251         int rcount;
252 
253         nproot = of_node_get(pdev->dev.parent->of_node);
254         if (!nproot)
255                 return -ENODEV;
256         np = of_get_child_by_name(nproot, "regulators");
257         if (!np) {
258                 dev_err(&pdev->dev, "failed to find regulators node\n");
259                 return -ENODEV;
260         }
261 
262         rcount = of_regulator_match(&pdev->dev, np,
263                                 &max8925_regulator_matches[ridx], 1);
264         of_node_put(np);
265         if (rcount < 0)
266                 return rcount;
267         config->init_data =     max8925_regulator_matches[ridx].init_data;
268         config->of_node = max8925_regulator_matches[ridx].of_node;
269 
270         return 0;
271 }
272 #else
273 #define max8925_regulator_dt_init(x, y, z)      (-1)
274 #endif
275 
276 static int max8925_regulator_probe(struct platform_device *pdev)
277 {
278         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
279         struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev);
280         struct regulator_config config = { };
281         struct max8925_regulator_info *ri;
282         struct resource *res;
283         struct regulator_dev *rdev;
284         int i, regulator_idx;
285 
286         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
287         if (!res) {
288                 dev_err(&pdev->dev, "No REG resource!\n");
289                 return -EINVAL;
290         }
291         for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
292                 ri = &max8925_regulator_info[i];
293                 if (ri->vol_reg == res->start) {
294                         regulator_idx = i;
295                         break;
296                 }
297         }
298 
299         if (i == ARRAY_SIZE(max8925_regulator_info)) {
300                 dev_err(&pdev->dev, "Failed to find regulator %llu\n",
301                         (unsigned long long)res->start);
302                 return -EINVAL;
303         }
304         ri->i2c = chip->i2c;
305 
306         config.dev = &pdev->dev;
307         config.driver_data = ri;
308 
309         if (max8925_regulator_dt_init(pdev, &config, regulator_idx))
310                 if (pdata)
311                         config.init_data = pdata;
312 
313         rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
314         if (IS_ERR(rdev)) {
315                 dev_err(&pdev->dev, "failed to register regulator %s\n",
316                                 ri->desc.name);
317                 return PTR_ERR(rdev);
318         }
319 
320         platform_set_drvdata(pdev, rdev);
321         return 0;
322 }
323 
324 static struct platform_driver max8925_regulator_driver = {
325         .driver         = {
326                 .name   = "max8925-regulator",
327                 .owner  = THIS_MODULE,
328         },
329         .probe          = max8925_regulator_probe,
330 };
331 
332 static int __init max8925_regulator_init(void)
333 {
334         return platform_driver_register(&max8925_regulator_driver);
335 }
336 subsys_initcall(max8925_regulator_init);
337 
338 static void __exit max8925_regulator_exit(void)
339 {
340         platform_driver_unregister(&max8925_regulator_driver);
341 }
342 module_exit(max8925_regulator_exit);
343 
344 MODULE_LICENSE("GPL");
345 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
346 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
347 MODULE_ALIAS("platform:max8925-regulator");
348 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us