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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                 .id             = MAX14577_SAFEOUT,
107                 .ops            = &max14577_safeout_ops,
108                 .type           = REGULATOR_VOLTAGE,
109                 .owner          = THIS_MODULE,
110                 .n_voltages     = 1,
111                 .min_uV         = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
112                 .enable_reg     = MAX14577_REG_CONTROL2,
113                 .enable_mask    = CTRL2_SFOUTORD_MASK,
114         },
115         [MAX14577_CHARGER] = {
116                 .name           = "CHARGER",
117                 .id             = MAX14577_CHARGER,
118                 .ops            = &max14577_charger_ops,
119                 .type           = REGULATOR_CURRENT,
120                 .owner          = THIS_MODULE,
121                 .enable_reg     = MAX14577_CHG_REG_CHG_CTRL2,
122                 .enable_mask    = CHGCTRL2_MBCHOSTEN_MASK,
123         },
124 };
125 
126 static struct regulator_ops max77836_ldo_ops = {
127         .is_enabled             = regulator_is_enabled_regmap,
128         .enable                 = regulator_enable_regmap,
129         .disable                = regulator_disable_regmap,
130         .list_voltage           = regulator_list_voltage_linear,
131         .map_voltage            = regulator_map_voltage_linear,
132         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
133         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
134         /* TODO: add .set_suspend_mode */
135 };
136 
137 static const struct regulator_desc max77836_supported_regulators[] = {
138         [MAX14577_SAFEOUT] = {
139                 .name           = "SAFEOUT",
140                 .id             = MAX14577_SAFEOUT,
141                 .ops            = &max14577_safeout_ops,
142                 .type           = REGULATOR_VOLTAGE,
143                 .owner          = THIS_MODULE,
144                 .n_voltages     = 1,
145                 .min_uV         = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
146                 .enable_reg     = MAX14577_REG_CONTROL2,
147                 .enable_mask    = CTRL2_SFOUTORD_MASK,
148         },
149         [MAX14577_CHARGER] = {
150                 .name           = "CHARGER",
151                 .id             = MAX14577_CHARGER,
152                 .ops            = &max14577_charger_ops,
153                 .type           = REGULATOR_CURRENT,
154                 .owner          = THIS_MODULE,
155                 .enable_reg     = MAX14577_CHG_REG_CHG_CTRL2,
156                 .enable_mask    = CHGCTRL2_MBCHOSTEN_MASK,
157         },
158         [MAX77836_LDO1] = {
159                 .name           = "LDO1",
160                 .id             = MAX77836_LDO1,
161                 .ops            = &max77836_ldo_ops,
162                 .type           = REGULATOR_VOLTAGE,
163                 .owner          = THIS_MODULE,
164                 .n_voltages     = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM,
165                 .min_uV         = MAX77836_REGULATOR_LDO_VOLTAGE_MIN,
166                 .uV_step        = MAX77836_REGULATOR_LDO_VOLTAGE_STEP,
167                 .enable_reg     = MAX77836_LDO_REG_CNFG1_LDO1,
168                 .enable_mask    = MAX77836_CNFG1_LDO_PWRMD_MASK,
169                 .vsel_reg       = MAX77836_LDO_REG_CNFG1_LDO1,
170                 .vsel_mask      = MAX77836_CNFG1_LDO_TV_MASK,
171         },
172         [MAX77836_LDO2] = {
173                 .name           = "LDO2",
174                 .id             = MAX77836_LDO2,
175                 .ops            = &max77836_ldo_ops,
176                 .type           = REGULATOR_VOLTAGE,
177                 .owner          = THIS_MODULE,
178                 .n_voltages     = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM,
179                 .min_uV         = MAX77836_REGULATOR_LDO_VOLTAGE_MIN,
180                 .uV_step        = MAX77836_REGULATOR_LDO_VOLTAGE_STEP,
181                 .enable_reg     = MAX77836_LDO_REG_CNFG1_LDO2,
182                 .enable_mask    = MAX77836_CNFG1_LDO_PWRMD_MASK,
183                 .vsel_reg       = MAX77836_LDO_REG_CNFG1_LDO2,
184                 .vsel_mask      = MAX77836_CNFG1_LDO_TV_MASK,
185         },
186 };
187 
188 #ifdef CONFIG_OF
189 static struct of_regulator_match max14577_regulator_matches[] = {
190         { .name = "SAFEOUT", },
191         { .name = "CHARGER", },
192 };
193 
194 static struct of_regulator_match max77836_regulator_matches[] = {
195         { .name = "SAFEOUT", },
196         { .name = "CHARGER", },
197         { .name = "LDO1", },
198         { .name = "LDO2", },
199 };
200 
201 static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev,
202                 enum maxim_device_type dev_type)
203 {
204         int ret;
205         struct device_node *np;
206         struct of_regulator_match *regulator_matches;
207         unsigned int regulator_matches_size;
208 
209         np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
210         if (!np) {
211                 dev_err(&pdev->dev, "Failed to get child OF node for regulators\n");
212                 return -EINVAL;
213         }
214 
215         switch (dev_type) {
216         case MAXIM_DEVICE_TYPE_MAX77836:
217                 regulator_matches = max77836_regulator_matches;
218                 regulator_matches_size = ARRAY_SIZE(max77836_regulator_matches);
219                 break;
220         case MAXIM_DEVICE_TYPE_MAX14577:
221         default:
222                 regulator_matches = max14577_regulator_matches;
223                 regulator_matches_size = ARRAY_SIZE(max14577_regulator_matches);
224         }
225 
226         ret = of_regulator_match(&pdev->dev, np, regulator_matches,
227                         regulator_matches_size);
228         if (ret < 0)
229                 dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret);
230         else
231                 ret = 0;
232 
233         of_node_put(np);
234 
235         return ret;
236 }
237 
238 static inline struct regulator_init_data *match_init_data(int index,
239                 enum maxim_device_type dev_type)
240 {
241         switch (dev_type) {
242         case MAXIM_DEVICE_TYPE_MAX77836:
243                 return max77836_regulator_matches[index].init_data;
244 
245         case MAXIM_DEVICE_TYPE_MAX14577:
246         default:
247                 return max14577_regulator_matches[index].init_data;
248         }
249 }
250 
251 static inline struct device_node *match_of_node(int index,
252                 enum maxim_device_type dev_type)
253 {
254         switch (dev_type) {
255         case MAXIM_DEVICE_TYPE_MAX77836:
256                 return max77836_regulator_matches[index].of_node;
257 
258         case MAXIM_DEVICE_TYPE_MAX14577:
259         default:
260                 return max14577_regulator_matches[index].of_node;
261         }
262 }
263 #else /* CONFIG_OF */
264 static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev,
265                 enum maxim_device_type dev_type)
266 {
267         return 0;
268 }
269 static inline struct regulator_init_data *match_init_data(int index,
270                 enum maxim_device_type dev_type)
271 {
272         return NULL;
273 }
274 
275 static inline struct device_node *match_of_node(int index,
276                 enum maxim_device_type dev_type)
277 {
278         return NULL;
279 }
280 #endif /* CONFIG_OF */
281 
282 /**
283  * Registers for regulators of max77836 use different I2C slave addresses so
284  * different regmaps must be used for them.
285  *
286  * Returns proper regmap for accessing regulator passed by id.
287  */
288 static struct regmap *max14577_get_regmap(struct max14577 *max14577,
289                 int reg_id)
290 {
291         switch (max14577->dev_type) {
292         case MAXIM_DEVICE_TYPE_MAX77836:
293                 switch (reg_id) {
294                 case MAX77836_SAFEOUT ... MAX77836_CHARGER:
295                         return max14577->regmap;
296                 default:
297                         /* MAX77836_LDO1 ... MAX77836_LDO2 */
298                         return max14577->regmap_pmic;
299                 }
300 
301         case MAXIM_DEVICE_TYPE_MAX14577:
302         default:
303                 return max14577->regmap;
304         }
305 }
306 
307 static int max14577_regulator_probe(struct platform_device *pdev)
308 {
309         struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
310         struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
311         int i, ret;
312         struct regulator_config config = {};
313         const struct regulator_desc *supported_regulators;
314         unsigned int supported_regulators_size;
315         enum maxim_device_type dev_type = max14577->dev_type;
316 
317         ret = max14577_regulator_dt_parse_pdata(pdev, dev_type);
318         if (ret)
319                 return ret;
320 
321         switch (dev_type) {
322         case MAXIM_DEVICE_TYPE_MAX77836:
323                 supported_regulators = max77836_supported_regulators;
324                 supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators);
325                 break;
326         case MAXIM_DEVICE_TYPE_MAX14577:
327         default:
328                 supported_regulators = max14577_supported_regulators;
329                 supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators);
330         }
331 
332         config.dev = &pdev->dev;
333         config.driver_data = max14577;
334 
335         for (i = 0; i < supported_regulators_size; i++) {
336                 struct regulator_dev *regulator;
337                 /*
338                  * Index of supported_regulators[] is also the id and must
339                  * match index of pdata->regulators[].
340                  */
341                 if (pdata && pdata->regulators) {
342                         config.init_data = pdata->regulators[i].initdata;
343                         config.of_node = pdata->regulators[i].of_node;
344                 } else {
345                         config.init_data = match_init_data(i, dev_type);
346                         config.of_node = match_of_node(i, dev_type);
347                 }
348                 config.regmap = max14577_get_regmap(max14577,
349                                 supported_regulators[i].id);
350 
351                 regulator = devm_regulator_register(&pdev->dev,
352                                 &supported_regulators[i], &config);
353                 if (IS_ERR(regulator)) {
354                         ret = PTR_ERR(regulator);
355                         dev_err(&pdev->dev,
356                                         "Regulator init failed for %d/%s with error: %d\n",
357                                         i, supported_regulators[i].name, ret);
358                         return ret;
359                 }
360         }
361 
362         return ret;
363 }
364 
365 static const struct platform_device_id max14577_regulator_id[] = {
366         { "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, },
367         { "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, },
368         { }
369 };
370 MODULE_DEVICE_TABLE(platform, max14577_regulator_id);
371 
372 static struct platform_driver max14577_regulator_driver = {
373         .driver = {
374                    .owner = THIS_MODULE,
375                    .name = "max14577-regulator",
376                    },
377         .probe          = max14577_regulator_probe,
378         .id_table       = max14577_regulator_id,
379 };
380 
381 static int __init max14577_regulator_init(void)
382 {
383         BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM);
384         BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM);
385 
386         BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN +
387                         (MAX77836_REGULATOR_LDO_VOLTAGE_STEP *
388                           (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) !=
389                         MAX77836_REGULATOR_LDO_VOLTAGE_MAX);
390 
391         return platform_driver_register(&max14577_regulator_driver);
392 }
393 subsys_initcall(max14577_regulator_init);
394 
395 static void __exit max14577_regulator_exit(void)
396 {
397         platform_driver_unregister(&max14577_regulator_driver);
398 }
399 module_exit(max14577_regulator_exit);
400 
401 MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
402 MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver");
403 MODULE_LICENSE("GPL");
404 MODULE_ALIAS("platform:max14577-regulator");
405 

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