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Linux/drivers/regulator/max14577.c

  1 /*
  2  * max14577.c - Regulator driver for the Maxim 14577/77836
  3  *
  4  * Copyright (C) 2013,2014 Samsung Electronics
  5  * Krzysztof Kozlowski <k.kozlowski@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 
 18 #include <linux/module.h>
 19 #include <linux/platform_device.h>
 20 #include <linux/regulator/driver.h>
 21 #include <linux/mfd/max14577.h>
 22 #include <linux/mfd/max14577-private.h>
 23 #include <linux/regulator/of_regulator.h>
 24 
 25 static int max14577_reg_is_enabled(struct regulator_dev *rdev)
 26 {
 27         int rid = rdev_get_id(rdev);
 28         struct regmap *rmap = rdev->regmap;
 29         u8 reg_data;
 30 
 31         switch (rid) {
 32         case MAX14577_CHARGER:
 33                 max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
 34                 if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
 35                         return 0;
 36                 max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
 37                 if ((reg_data & STATUS3_CGMBC_MASK) == 0)
 38                         return 0;
 39                 /* MBCHOSTEN and CGMBC are on */
 40                 return 1;
 41         default:
 42                 return -EINVAL;
 43         }
 44 }
 45 
 46 static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
 47 {
 48         u8 reg_data;
 49         struct regmap *rmap = rdev->regmap;
 50         struct max14577 *max14577 = rdev_get_drvdata(rdev);
 51         const struct maxim_charger_current *limits =
 52                 &maxim_charger_currents[max14577->dev_type];
 53 
 54         if (rdev_get_id(rdev) != MAX14577_CHARGER)
 55                 return -EINVAL;
 56 
 57         max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);
 58 
 59         if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
 60                 return limits->min;
 61 
 62         reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
 63                         CHGCTRL4_MBCICHWRCH_SHIFT);
 64         return limits->high_start + reg_data * limits->high_step;
 65 }
 66 
 67 static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
 68                 int min_uA, int max_uA)
 69 {
 70         u8 reg_data;
 71         int ret;
 72         struct max14577 *max14577 = rdev_get_drvdata(rdev);
 73         const struct maxim_charger_current *limits =
 74                 &maxim_charger_currents[max14577->dev_type];
 75 
 76         if (rdev_get_id(rdev) != MAX14577_CHARGER)
 77                 return -EINVAL;
 78 
 79         ret = maxim_charger_calc_reg_current(limits, min_uA, max_uA, &reg_data);
 80         if (ret)
 81                 return ret;
 82 
 83         return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
 84                         CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
 85                         reg_data);
 86 }
 87 
 88 static struct regulator_ops max14577_safeout_ops = {
 89         .is_enabled             = regulator_is_enabled_regmap,
 90         .enable                 = regulator_enable_regmap,
 91         .disable                = regulator_disable_regmap,
 92         .list_voltage           = regulator_list_voltage_linear,
 93 };
 94 
 95 static struct regulator_ops max14577_charger_ops = {
 96         .is_enabled             = max14577_reg_is_enabled,
 97         .enable                 = regulator_enable_regmap,
 98         .disable                = regulator_disable_regmap,
 99         .get_current_limit      = max14577_reg_get_current_limit,
100         .set_current_limit      = max14577_reg_set_current_limit,
101 };
102 
103 static const struct regulator_desc max14577_supported_regulators[] = {
104         [MAX14577_SAFEOUT] = {
105                 .name           = "SAFEOUT",
106                 .of_match       = of_match_ptr("SAFEOUT"),
107                 .regulators_node = of_match_ptr("regulators"),
108                 .id             = MAX14577_SAFEOUT,
109                 .ops            = &max14577_safeout_ops,
110                 .type           = REGULATOR_VOLTAGE,
111                 .owner          = THIS_MODULE,
112                 .n_voltages     = 1,
113                 .min_uV         = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
114                 .enable_reg     = MAX14577_REG_CONTROL2,
115                 .enable_mask    = CTRL2_SFOUTORD_MASK,
116         },
117         [MAX14577_CHARGER] = {
118                 .name           = "CHARGER",
119                 .of_match       = of_match_ptr("CHARGER"),
120                 .regulators_node = of_match_ptr("regulators"),
121                 .id             = MAX14577_CHARGER,
122                 .ops            = &max14577_charger_ops,
123                 .type           = REGULATOR_CURRENT,
124                 .owner          = THIS_MODULE,
125                 .enable_reg     = MAX14577_CHG_REG_CHG_CTRL2,
126                 .enable_mask    = CHGCTRL2_MBCHOSTEN_MASK,
127         },
128 };
129 
130 static struct regulator_ops max77836_ldo_ops = {
131         .is_enabled             = regulator_is_enabled_regmap,
132         .enable                 = regulator_enable_regmap,
133         .disable                = regulator_disable_regmap,
134         .list_voltage           = regulator_list_voltage_linear,
135         .map_voltage            = regulator_map_voltage_linear,
136         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
137         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
138         /* TODO: add .set_suspend_mode */
139 };
140 
141 static const struct regulator_desc max77836_supported_regulators[] = {
142         [MAX14577_SAFEOUT] = {
143                 .name           = "SAFEOUT",
144                 .of_match       = of_match_ptr("SAFEOUT"),
145                 .regulators_node = of_match_ptr("regulators"),
146                 .id             = MAX14577_SAFEOUT,
147                 .ops            = &max14577_safeout_ops,
148                 .type           = REGULATOR_VOLTAGE,
149                 .owner          = THIS_MODULE,
150                 .n_voltages     = 1,
151                 .min_uV         = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
152                 .enable_reg     = MAX14577_REG_CONTROL2,
153                 .enable_mask    = CTRL2_SFOUTORD_MASK,
154         },
155         [MAX14577_CHARGER] = {
156                 .name           = "CHARGER",
157                 .of_match       = of_match_ptr("CHARGER"),
158                 .regulators_node = of_match_ptr("regulators"),
159                 .id             = MAX14577_CHARGER,
160                 .ops            = &max14577_charger_ops,
161                 .type           = REGULATOR_CURRENT,
162                 .owner          = THIS_MODULE,
163                 .enable_reg     = MAX14577_CHG_REG_CHG_CTRL2,
164                 .enable_mask    = CHGCTRL2_MBCHOSTEN_MASK,
165         },
166         [MAX77836_LDO1] = {
167                 .name           = "LDO1",
168                 .of_match       = of_match_ptr("LDO1"),
169                 .regulators_node = of_match_ptr("regulators"),
170                 .id             = MAX77836_LDO1,
171                 .ops            = &max77836_ldo_ops,
172                 .type           = REGULATOR_VOLTAGE,
173                 .owner          = THIS_MODULE,
174                 .n_voltages     = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM,
175                 .min_uV         = MAX77836_REGULATOR_LDO_VOLTAGE_MIN,
176                 .uV_step        = MAX77836_REGULATOR_LDO_VOLTAGE_STEP,
177                 .enable_reg     = MAX77836_LDO_REG_CNFG1_LDO1,
178                 .enable_mask    = MAX77836_CNFG1_LDO_PWRMD_MASK,
179                 .vsel_reg       = MAX77836_LDO_REG_CNFG1_LDO1,
180                 .vsel_mask      = MAX77836_CNFG1_LDO_TV_MASK,
181         },
182         [MAX77836_LDO2] = {
183                 .name           = "LDO2",
184                 .of_match       = of_match_ptr("LDO2"),
185                 .regulators_node = of_match_ptr("regulators"),
186                 .id             = MAX77836_LDO2,
187                 .ops            = &max77836_ldo_ops,
188                 .type           = REGULATOR_VOLTAGE,
189                 .owner          = THIS_MODULE,
190                 .n_voltages     = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM,
191                 .min_uV         = MAX77836_REGULATOR_LDO_VOLTAGE_MIN,
192                 .uV_step        = MAX77836_REGULATOR_LDO_VOLTAGE_STEP,
193                 .enable_reg     = MAX77836_LDO_REG_CNFG1_LDO2,
194                 .enable_mask    = MAX77836_CNFG1_LDO_PWRMD_MASK,
195                 .vsel_reg       = MAX77836_LDO_REG_CNFG1_LDO2,
196                 .vsel_mask      = MAX77836_CNFG1_LDO_TV_MASK,
197         },
198 };
199 
200 #ifdef CONFIG_OF
201 static struct of_regulator_match max14577_regulator_matches[] = {
202         { .name = "SAFEOUT", },
203         { .name = "CHARGER", },
204 };
205 
206 static struct of_regulator_match max77836_regulator_matches[] = {
207         { .name = "SAFEOUT", },
208         { .name = "CHARGER", },
209         { .name = "LDO1", },
210         { .name = "LDO2", },
211 };
212 
213 static inline struct regulator_init_data *match_init_data(int index,
214                 enum maxim_device_type dev_type)
215 {
216         switch (dev_type) {
217         case MAXIM_DEVICE_TYPE_MAX77836:
218                 return max77836_regulator_matches[index].init_data;
219 
220         case MAXIM_DEVICE_TYPE_MAX14577:
221         default:
222                 return max14577_regulator_matches[index].init_data;
223         }
224 }
225 
226 static inline struct device_node *match_of_node(int index,
227                 enum maxim_device_type dev_type)
228 {
229         switch (dev_type) {
230         case MAXIM_DEVICE_TYPE_MAX77836:
231                 return max77836_regulator_matches[index].of_node;
232 
233         case MAXIM_DEVICE_TYPE_MAX14577:
234         default:
235                 return max14577_regulator_matches[index].of_node;
236         }
237 }
238 #else /* CONFIG_OF */
239 static inline struct regulator_init_data *match_init_data(int index,
240                 enum maxim_device_type dev_type)
241 {
242         return NULL;
243 }
244 
245 static inline struct device_node *match_of_node(int index,
246                 enum maxim_device_type dev_type)
247 {
248         return NULL;
249 }
250 #endif /* CONFIG_OF */
251 
252 /**
253  * Registers for regulators of max77836 use different I2C slave addresses so
254  * different regmaps must be used for them.
255  *
256  * Returns proper regmap for accessing regulator passed by id.
257  */
258 static struct regmap *max14577_get_regmap(struct max14577 *max14577,
259                 int reg_id)
260 {
261         switch (max14577->dev_type) {
262         case MAXIM_DEVICE_TYPE_MAX77836:
263                 switch (reg_id) {
264                 case MAX77836_SAFEOUT ... MAX77836_CHARGER:
265                         return max14577->regmap;
266                 default:
267                         /* MAX77836_LDO1 ... MAX77836_LDO2 */
268                         return max14577->regmap_pmic;
269                 }
270 
271         case MAXIM_DEVICE_TYPE_MAX14577:
272         default:
273                 return max14577->regmap;
274         }
275 }
276 
277 static int max14577_regulator_probe(struct platform_device *pdev)
278 {
279         struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
280         struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
281         int i, ret = 0;
282         struct regulator_config config = {};
283         const struct regulator_desc *supported_regulators;
284         unsigned int supported_regulators_size;
285         enum maxim_device_type dev_type = max14577->dev_type;
286 
287         switch (dev_type) {
288         case MAXIM_DEVICE_TYPE_MAX77836:
289                 supported_regulators = max77836_supported_regulators;
290                 supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators);
291                 break;
292         case MAXIM_DEVICE_TYPE_MAX14577:
293         default:
294                 supported_regulators = max14577_supported_regulators;
295                 supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators);
296         }
297 
298         config.dev = max14577->dev;
299         config.driver_data = max14577;
300 
301         for (i = 0; i < supported_regulators_size; i++) {
302                 struct regulator_dev *regulator;
303                 /*
304                  * Index of supported_regulators[] is also the id and must
305                  * match index of pdata->regulators[].
306                  */
307                 if (pdata && pdata->regulators) {
308                         config.init_data = pdata->regulators[i].initdata;
309                         config.of_node = pdata->regulators[i].of_node;
310                 } else {
311                         config.init_data = match_init_data(i, dev_type);
312                         config.of_node = match_of_node(i, dev_type);
313                 }
314                 config.regmap = max14577_get_regmap(max14577,
315                                 supported_regulators[i].id);
316 
317                 regulator = devm_regulator_register(&pdev->dev,
318                                 &supported_regulators[i], &config);
319                 if (IS_ERR(regulator)) {
320                         ret = PTR_ERR(regulator);
321                         dev_err(&pdev->dev,
322                                         "Regulator init failed for %d/%s with error: %d\n",
323                                         i, supported_regulators[i].name, ret);
324                         return ret;
325                 }
326         }
327 
328         return ret;
329 }
330 
331 static const struct platform_device_id max14577_regulator_id[] = {
332         { "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, },
333         { "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, },
334         { }
335 };
336 MODULE_DEVICE_TABLE(platform, max14577_regulator_id);
337 
338 static struct platform_driver max14577_regulator_driver = {
339         .driver = {
340                    .name = "max14577-regulator",
341                    },
342         .probe          = max14577_regulator_probe,
343         .id_table       = max14577_regulator_id,
344 };
345 
346 static int __init max14577_regulator_init(void)
347 {
348         BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM);
349         BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM);
350 
351         BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN +
352                         (MAX77836_REGULATOR_LDO_VOLTAGE_STEP *
353                           (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) !=
354                         MAX77836_REGULATOR_LDO_VOLTAGE_MAX);
355 
356         return platform_driver_register(&max14577_regulator_driver);
357 }
358 subsys_initcall(max14577_regulator_init);
359 
360 static void __exit max14577_regulator_exit(void)
361 {
362         platform_driver_unregister(&max14577_regulator_driver);
363 }
364 module_exit(max14577_regulator_exit);
365 
366 MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
367 MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver");
368 MODULE_LICENSE("GPL");
369 MODULE_ALIAS("platform:max14577-regulator");
370 

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