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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 #define MAX14577_SAFEOUT_REG    { \
104         .name           = "SAFEOUT", \
105         .of_match       = of_match_ptr("SAFEOUT"), \
106         .regulators_node = of_match_ptr("regulators"), \
107         .id             = MAX14577_SAFEOUT, \
108         .ops            = &max14577_safeout_ops, \
109         .type           = REGULATOR_VOLTAGE, \
110         .owner          = THIS_MODULE, \
111         .n_voltages     = 1, \
112         .min_uV         = MAX14577_REGULATOR_SAFEOUT_VOLTAGE, \
113         .enable_reg     = MAX14577_REG_CONTROL2, \
114         .enable_mask    = CTRL2_SFOUTORD_MASK, \
115 }
116 #define MAX14577_CHARGER_REG    { \
117         .name           = "CHARGER", \
118         .of_match       = of_match_ptr("CHARGER"), \
119         .regulators_node = of_match_ptr("regulators"), \
120         .id             = MAX14577_CHARGER, \
121         .ops            = &max14577_charger_ops, \
122         .type           = REGULATOR_CURRENT, \
123         .owner          = THIS_MODULE, \
124         .enable_reg     = MAX14577_CHG_REG_CHG_CTRL2, \
125         .enable_mask    = CHGCTRL2_MBCHOSTEN_MASK, \
126 }
127 
128 static const struct regulator_desc max14577_supported_regulators[] = {
129         [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG,
130         [MAX14577_CHARGER] = MAX14577_CHARGER_REG,
131 };
132 
133 static struct regulator_ops max77836_ldo_ops = {
134         .is_enabled             = regulator_is_enabled_regmap,
135         .enable                 = regulator_enable_regmap,
136         .disable                = regulator_disable_regmap,
137         .list_voltage           = regulator_list_voltage_linear,
138         .map_voltage            = regulator_map_voltage_linear,
139         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
140         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
141         /* TODO: add .set_suspend_mode */
142 };
143 
144 #define MAX77836_LDO_REG(num)   { \
145         .name           = "LDO" # num, \
146         .of_match       = of_match_ptr("LDO" # num), \
147         .regulators_node = of_match_ptr("regulators"), \
148         .id             = MAX77836_LDO ## num, \
149         .ops            = &max77836_ldo_ops, \
150         .type           = REGULATOR_VOLTAGE, \
151         .owner          = THIS_MODULE, \
152         .n_voltages     = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM, \
153         .min_uV         = MAX77836_REGULATOR_LDO_VOLTAGE_MIN, \
154         .uV_step        = MAX77836_REGULATOR_LDO_VOLTAGE_STEP, \
155         .enable_reg     = MAX77836_LDO_REG_CNFG1_LDO ## num, \
156         .enable_mask    = MAX77836_CNFG1_LDO_PWRMD_MASK, \
157         .vsel_reg       = MAX77836_LDO_REG_CNFG1_LDO ## num, \
158         .vsel_mask      = MAX77836_CNFG1_LDO_TV_MASK, \
159 }
160 
161 static const struct regulator_desc max77836_supported_regulators[] = {
162         [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG,
163         [MAX14577_CHARGER] = MAX14577_CHARGER_REG,
164         [MAX77836_LDO1] = MAX77836_LDO_REG(1),
165         [MAX77836_LDO2] = MAX77836_LDO_REG(2),
166 };
167 
168 #ifdef CONFIG_OF
169 static struct of_regulator_match max14577_regulator_matches[] = {
170         { .name = "SAFEOUT", },
171         { .name = "CHARGER", },
172 };
173 
174 static struct of_regulator_match max77836_regulator_matches[] = {
175         { .name = "SAFEOUT", },
176         { .name = "CHARGER", },
177         { .name = "LDO1", },
178         { .name = "LDO2", },
179 };
180 
181 static inline struct regulator_init_data *match_init_data(int index,
182                 enum maxim_device_type dev_type)
183 {
184         switch (dev_type) {
185         case MAXIM_DEVICE_TYPE_MAX77836:
186                 return max77836_regulator_matches[index].init_data;
187 
188         case MAXIM_DEVICE_TYPE_MAX14577:
189         default:
190                 return max14577_regulator_matches[index].init_data;
191         }
192 }
193 
194 static inline struct device_node *match_of_node(int index,
195                 enum maxim_device_type dev_type)
196 {
197         switch (dev_type) {
198         case MAXIM_DEVICE_TYPE_MAX77836:
199                 return max77836_regulator_matches[index].of_node;
200 
201         case MAXIM_DEVICE_TYPE_MAX14577:
202         default:
203                 return max14577_regulator_matches[index].of_node;
204         }
205 }
206 #else /* CONFIG_OF */
207 static inline struct regulator_init_data *match_init_data(int index,
208                 enum maxim_device_type dev_type)
209 {
210         return NULL;
211 }
212 
213 static inline struct device_node *match_of_node(int index,
214                 enum maxim_device_type dev_type)
215 {
216         return NULL;
217 }
218 #endif /* CONFIG_OF */
219 
220 /**
221  * Registers for regulators of max77836 use different I2C slave addresses so
222  * different regmaps must be used for them.
223  *
224  * Returns proper regmap for accessing regulator passed by id.
225  */
226 static struct regmap *max14577_get_regmap(struct max14577 *max14577,
227                 int reg_id)
228 {
229         switch (max14577->dev_type) {
230         case MAXIM_DEVICE_TYPE_MAX77836:
231                 switch (reg_id) {
232                 case MAX77836_SAFEOUT ... MAX77836_CHARGER:
233                         return max14577->regmap;
234                 default:
235                         /* MAX77836_LDO1 ... MAX77836_LDO2 */
236                         return max14577->regmap_pmic;
237                 }
238 
239         case MAXIM_DEVICE_TYPE_MAX14577:
240         default:
241                 return max14577->regmap;
242         }
243 }
244 
245 static int max14577_regulator_probe(struct platform_device *pdev)
246 {
247         struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
248         struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
249         int i, ret = 0;
250         struct regulator_config config = {};
251         const struct regulator_desc *supported_regulators;
252         unsigned int supported_regulators_size;
253         enum maxim_device_type dev_type = max14577->dev_type;
254 
255         switch (dev_type) {
256         case MAXIM_DEVICE_TYPE_MAX77836:
257                 supported_regulators = max77836_supported_regulators;
258                 supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators);
259                 break;
260         case MAXIM_DEVICE_TYPE_MAX14577:
261         default:
262                 supported_regulators = max14577_supported_regulators;
263                 supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators);
264         }
265 
266         config.dev = max14577->dev;
267         config.driver_data = max14577;
268 
269         for (i = 0; i < supported_regulators_size; i++) {
270                 struct regulator_dev *regulator;
271                 /*
272                  * Index of supported_regulators[] is also the id and must
273                  * match index of pdata->regulators[].
274                  */
275                 if (pdata && pdata->regulators) {
276                         config.init_data = pdata->regulators[i].initdata;
277                         config.of_node = pdata->regulators[i].of_node;
278                 } else {
279                         config.init_data = match_init_data(i, dev_type);
280                         config.of_node = match_of_node(i, dev_type);
281                 }
282                 config.regmap = max14577_get_regmap(max14577,
283                                 supported_regulators[i].id);
284 
285                 regulator = devm_regulator_register(&pdev->dev,
286                                 &supported_regulators[i], &config);
287                 if (IS_ERR(regulator)) {
288                         ret = PTR_ERR(regulator);
289                         dev_err(&pdev->dev,
290                                         "Regulator init failed for %d/%s with error: %d\n",
291                                         i, supported_regulators[i].name, ret);
292                         return ret;
293                 }
294         }
295 
296         return ret;
297 }
298 
299 static const struct platform_device_id max14577_regulator_id[] = {
300         { "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, },
301         { "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, },
302         { }
303 };
304 MODULE_DEVICE_TABLE(platform, max14577_regulator_id);
305 
306 static struct platform_driver max14577_regulator_driver = {
307         .driver = {
308                    .name = "max14577-regulator",
309                    },
310         .probe          = max14577_regulator_probe,
311         .id_table       = max14577_regulator_id,
312 };
313 
314 static int __init max14577_regulator_init(void)
315 {
316         BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM);
317         BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM);
318 
319         BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN +
320                         (MAX77836_REGULATOR_LDO_VOLTAGE_STEP *
321                           (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) !=
322                         MAX77836_REGULATOR_LDO_VOLTAGE_MAX);
323 
324         return platform_driver_register(&max14577_regulator_driver);
325 }
326 subsys_initcall(max14577_regulator_init);
327 
328 static void __exit max14577_regulator_exit(void)
329 {
330         platform_driver_unregister(&max14577_regulator_driver);
331 }
332 module_exit(max14577_regulator_exit);
333 
334 MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
335 MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver");
336 MODULE_LICENSE("GPL");
337 MODULE_ALIAS("platform:max14577-regulator");
338 

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