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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 regulator_dev    *regulator;
 40         struct i2c_client       *i2c;
 41         struct max8925_chip     *chip;
 42 
 43         int     vol_reg;
 44         int     enable_reg;
 45 };
 46 
 47 static int max8925_set_voltage_sel(struct regulator_dev *rdev,
 48                                    unsigned int selector)
 49 {
 50         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 51         unsigned char mask = rdev->desc->n_voltages - 1;
 52 
 53         return max8925_set_bits(info->i2c, info->vol_reg, mask, selector);
 54 }
 55 
 56 static int max8925_get_voltage_sel(struct regulator_dev *rdev)
 57 {
 58         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 59         unsigned char data, mask;
 60         int ret;
 61 
 62         ret = max8925_reg_read(info->i2c, info->vol_reg);
 63         if (ret < 0)
 64                 return ret;
 65         mask = rdev->desc->n_voltages - 1;
 66         data = ret & mask;
 67 
 68         return data;
 69 }
 70 
 71 static int max8925_enable(struct regulator_dev *rdev)
 72 {
 73         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 74 
 75         return max8925_set_bits(info->i2c, info->enable_reg,
 76                                 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
 77                                 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
 78                                 LDO_SEQ_I2C << LDO_SEQ_SHIFT |
 79                                 LDO_I2C_EN << LDO_I2C_EN_SHIFT);
 80 }
 81 
 82 static int max8925_disable(struct regulator_dev *rdev)
 83 {
 84         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 85 
 86         return max8925_set_bits(info->i2c, info->enable_reg,
 87                                 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
 88                                 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
 89                                 LDO_SEQ_I2C << LDO_SEQ_SHIFT);
 90 }
 91 
 92 static int max8925_is_enabled(struct regulator_dev *rdev)
 93 {
 94         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 95         int ldo_seq, ret;
 96 
 97         ret = max8925_reg_read(info->i2c, info->enable_reg);
 98         if (ret < 0)
 99                 return ret;
100         ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
101         if (ldo_seq != LDO_SEQ_I2C)
102                 return 1;
103         else
104                 return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
105 }
106 
107 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
108 {
109         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
110         unsigned char data, mask;
111 
112         if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
113                 return -EINVAL;
114 
115         data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
116         data <<= SD1_DVM_SHIFT;
117         mask = 3 << SD1_DVM_SHIFT;
118 
119         return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
120 }
121 
122 static int max8925_set_dvm_enable(struct regulator_dev *rdev)
123 {
124         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
125 
126         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
127                                 1 << SD1_DVM_EN);
128 }
129 
130 static int max8925_set_dvm_disable(struct regulator_dev *rdev)
131 {
132         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
133 
134         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
135 }
136 
137 static struct regulator_ops max8925_regulator_sdv_ops = {
138         .map_voltage            = regulator_map_voltage_linear,
139         .list_voltage           = regulator_list_voltage_linear,
140         .set_voltage_sel        = max8925_set_voltage_sel,
141         .get_voltage_sel        = max8925_get_voltage_sel,
142         .enable                 = max8925_enable,
143         .disable                = max8925_disable,
144         .is_enabled             = max8925_is_enabled,
145         .set_suspend_voltage    = max8925_set_dvm_voltage,
146         .set_suspend_enable     = max8925_set_dvm_enable,
147         .set_suspend_disable    = max8925_set_dvm_disable,
148 };
149 
150 static struct regulator_ops max8925_regulator_ldo_ops = {
151         .map_voltage            = regulator_map_voltage_linear,
152         .list_voltage           = regulator_list_voltage_linear,
153         .set_voltage_sel        = max8925_set_voltage_sel,
154         .get_voltage_sel        = max8925_get_voltage_sel,
155         .enable                 = max8925_enable,
156         .disable                = max8925_disable,
157         .is_enabled             = max8925_is_enabled,
158 };
159 
160 #define MAX8925_SDV(_id, min, max, step)                        \
161 {                                                               \
162         .desc   = {                                             \
163                 .name   = "SDV" #_id,                           \
164                 .ops    = &max8925_regulator_sdv_ops,           \
165                 .type   = REGULATOR_VOLTAGE,                    \
166                 .id     = MAX8925_ID_SD##_id,                   \
167                 .owner  = THIS_MODULE,                          \
168                 .n_voltages = 64,                               \
169                 .min_uV = min * 1000,                           \
170                 .uV_step = step * 1000,                         \
171         },                                                      \
172         .vol_reg        = MAX8925_SDV##_id,                     \
173         .enable_reg     = MAX8925_SDCTL##_id,                   \
174 }
175 
176 #define MAX8925_LDO(_id, min, max, step)                        \
177 {                                                               \
178         .desc   = {                                             \
179                 .name   = "LDO" #_id,                           \
180                 .ops    = &max8925_regulator_ldo_ops,           \
181                 .type   = REGULATOR_VOLTAGE,                    \
182                 .id     = MAX8925_ID_LDO##_id,                  \
183                 .owner  = THIS_MODULE,                          \
184                 .n_voltages = 64,                               \
185                 .min_uV = min * 1000,                           \
186                 .uV_step = step * 1000,                         \
187         },                                                      \
188         .vol_reg        = MAX8925_LDOVOUT##_id,                 \
189         .enable_reg     = MAX8925_LDOCTL##_id,                  \
190 }
191 
192 #ifdef CONFIG_OF
193 static struct of_regulator_match max8925_regulator_matches[] = {
194         { .name = "SDV1",},
195         { .name = "SDV2",},
196         { .name = "SDV3",},
197         { .name = "LDO1",},
198         { .name = "LDO2",},
199         { .name = "LDO3",},
200         { .name = "LDO4",},
201         { .name = "LDO5",},
202         { .name = "LDO6",},
203         { .name = "LDO7",},
204         { .name = "LDO8",},
205         { .name = "LDO9",},
206         { .name = "LDO10",},
207         { .name = "LDO11",},
208         { .name = "LDO12",},
209         { .name = "LDO13",},
210         { .name = "LDO14",},
211         { .name = "LDO15",},
212         { .name = "LDO16",},
213         { .name = "LDO17",},
214         { .name = "LDO18",},
215         { .name = "LDO19",},
216         { .name = "LDO20",},
217 };
218 #endif
219 
220 static struct max8925_regulator_info max8925_regulator_info[] = {
221         MAX8925_SDV(1, 637.5, 1425, 12.5),
222         MAX8925_SDV(2,   650, 2225,   25),
223         MAX8925_SDV(3,   750, 3900,   50),
224 
225         MAX8925_LDO(1,  750, 3900, 50),
226         MAX8925_LDO(2,  650, 2250, 25),
227         MAX8925_LDO(3,  650, 2250, 25),
228         MAX8925_LDO(4,  750, 3900, 50),
229         MAX8925_LDO(5,  750, 3900, 50),
230         MAX8925_LDO(6,  750, 3900, 50),
231         MAX8925_LDO(7,  750, 3900, 50),
232         MAX8925_LDO(8,  750, 3900, 50),
233         MAX8925_LDO(9,  750, 3900, 50),
234         MAX8925_LDO(10, 750, 3900, 50),
235         MAX8925_LDO(11, 750, 3900, 50),
236         MAX8925_LDO(12, 750, 3900, 50),
237         MAX8925_LDO(13, 750, 3900, 50),
238         MAX8925_LDO(14, 750, 3900, 50),
239         MAX8925_LDO(15, 750, 3900, 50),
240         MAX8925_LDO(16, 750, 3900, 50),
241         MAX8925_LDO(17, 650, 2250, 25),
242         MAX8925_LDO(18, 650, 2250, 25),
243         MAX8925_LDO(19, 750, 3900, 50),
244         MAX8925_LDO(20, 750, 3900, 50),
245 };
246 
247 #ifdef CONFIG_OF
248 static int max8925_regulator_dt_init(struct platform_device *pdev,
249                                     struct regulator_config *config,
250                                     int ridx)
251 {
252         struct device_node *nproot, *np;
253         int rcount;
254         nproot = of_node_get(pdev->dev.parent->of_node);
255         if (!nproot)
256                 return -ENODEV;
257         np = of_find_node_by_name(nproot, "regulators");
258         if (!np) {
259                 dev_err(&pdev->dev, "failed to find regulators node\n");
260                 return -ENODEV;
261         }
262 
263         rcount = of_regulator_match(&pdev->dev, np,
264                                 &max8925_regulator_matches[ridx], 1);
265         of_node_put(np);
266         if (rcount < 0)
267                 return -ENODEV;
268         config->init_data =     max8925_regulator_matches[ridx].init_data;
269         config->of_node = max8925_regulator_matches[ridx].of_node;
270 
271         return 0;
272 }
273 #else
274 #define max8925_regulator_dt_init(x, y, z)      (-1)
275 #endif
276 
277 static int max8925_regulator_probe(struct platform_device *pdev)
278 {
279         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
280         struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev);
281         struct regulator_config config = { };
282         struct max8925_regulator_info *ri;
283         struct resource *res;
284         struct regulator_dev *rdev;
285         int i, regulator_idx;
286 
287         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
288         if (!res) {
289                 dev_err(&pdev->dev, "No REG resource!\n");
290                 return -EINVAL;
291         }
292         for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
293                 ri = &max8925_regulator_info[i];
294                 if (ri->vol_reg == res->start) {
295                         regulator_idx = i;
296                         break;
297                 }
298         }
299 
300         if (i == ARRAY_SIZE(max8925_regulator_info)) {
301                 dev_err(&pdev->dev, "Failed to find regulator %llu\n",
302                         (unsigned long long)res->start);
303                 return -EINVAL;
304         }
305         ri->i2c = chip->i2c;
306         ri->chip = chip;
307 
308         config.dev = &pdev->dev;
309         config.driver_data = ri;
310 
311         if (max8925_regulator_dt_init(pdev, &config, regulator_idx))
312                 if (pdata)
313                         config.init_data = pdata;
314 
315         rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
316         if (IS_ERR(rdev)) {
317                 dev_err(&pdev->dev, "failed to register regulator %s\n",
318                                 ri->desc.name);
319                 return PTR_ERR(rdev);
320         }
321 
322         platform_set_drvdata(pdev, rdev);
323         return 0;
324 }
325 
326 static struct platform_driver max8925_regulator_driver = {
327         .driver         = {
328                 .name   = "max8925-regulator",
329                 .owner  = THIS_MODULE,
330         },
331         .probe          = max8925_regulator_probe,
332 };
333 
334 static int __init max8925_regulator_init(void)
335 {
336         return platform_driver_register(&max8925_regulator_driver);
337 }
338 subsys_initcall(max8925_regulator_init);
339 
340 static void __exit max8925_regulator_exit(void)
341 {
342         platform_driver_unregister(&max8925_regulator_driver);
343 }
344 module_exit(max8925_regulator_exit);
345 
346 MODULE_LICENSE("GPL");
347 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
348 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
349 MODULE_ALIAS("platform:max8925-regulator");
350 

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