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Linux/drivers/regulator/max14577.c

  1 /*
  2  * max14577.c - Regulator driver for the Maxim 14577
  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 
 51         if (rdev_get_id(rdev) != MAX14577_CHARGER)
 52                 return -EINVAL;
 53 
 54         max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);
 55 
 56         if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
 57                 return MAX14577_REGULATOR_CURRENT_LIMIT_MIN;
 58 
 59         reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
 60                         CHGCTRL4_MBCICHWRCH_SHIFT);
 61         return MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
 62                 reg_data * MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP;
 63 }
 64 
 65 static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
 66                 int min_uA, int max_uA)
 67 {
 68         int i, current_bits = 0xf;
 69         u8 reg_data;
 70 
 71         if (rdev_get_id(rdev) != MAX14577_CHARGER)
 72                 return -EINVAL;
 73 
 74         if (min_uA > MAX14577_REGULATOR_CURRENT_LIMIT_MAX ||
 75                         max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_MIN)
 76                 return -EINVAL;
 77 
 78         if (max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START) {
 79                 /* Less than 200 mA, so set 90mA (turn only Low Bit off) */
 80                 u8 reg_data = 0x0 << CHGCTRL4_MBCICHWRCL_SHIFT;
 81                 return max14577_update_reg(rdev->regmap,
 82                                 MAX14577_CHG_REG_CHG_CTRL4,
 83                                 CHGCTRL4_MBCICHWRCL_MASK, reg_data);
 84         }
 85 
 86         /* max_uA is in range: <LIMIT_HIGH_START, inifinite>, so search for
 87          * valid current starting from LIMIT_MAX. */
 88         for (i = MAX14577_REGULATOR_CURRENT_LIMIT_MAX;
 89                         i >= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START;
 90                         i -= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP) {
 91                 if (i <= max_uA)
 92                         break;
 93                 current_bits--;
 94         }
 95         BUG_ON(current_bits < 0); /* Cannot happen */
 96         /* Turn Low Bit on (use range 200mA-950 mA) */
 97         reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
 98         /* and set proper High Bits */
 99         reg_data |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT;
100 
101         return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
102                         CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
103                         reg_data);
104 }
105 
106 static struct regulator_ops max14577_safeout_ops = {
107         .is_enabled             = regulator_is_enabled_regmap,
108         .enable                 = regulator_enable_regmap,
109         .disable                = regulator_disable_regmap,
110         .list_voltage           = regulator_list_voltage_linear,
111 };
112 
113 static struct regulator_ops max14577_charger_ops = {
114         .is_enabled             = max14577_reg_is_enabled,
115         .enable                 = regulator_enable_regmap,
116         .disable                = regulator_disable_regmap,
117         .get_current_limit      = max14577_reg_get_current_limit,
118         .set_current_limit      = max14577_reg_set_current_limit,
119 };
120 
121 static const struct regulator_desc supported_regulators[] = {
122         [MAX14577_SAFEOUT] = {
123                 .name           = "SAFEOUT",
124                 .id             = MAX14577_SAFEOUT,
125                 .ops            = &max14577_safeout_ops,
126                 .type           = REGULATOR_VOLTAGE,
127                 .owner          = THIS_MODULE,
128                 .n_voltages     = 1,
129                 .min_uV         = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
130                 .enable_reg     = MAX14577_REG_CONTROL2,
131                 .enable_mask    = CTRL2_SFOUTORD_MASK,
132         },
133         [MAX14577_CHARGER] = {
134                 .name           = "CHARGER",
135                 .id             = MAX14577_CHARGER,
136                 .ops            = &max14577_charger_ops,
137                 .type           = REGULATOR_CURRENT,
138                 .owner          = THIS_MODULE,
139                 .enable_reg     = MAX14577_CHG_REG_CHG_CTRL2,
140                 .enable_mask    = CHGCTRL2_MBCHOSTEN_MASK,
141         },
142 };
143 
144 #ifdef CONFIG_OF
145 static struct of_regulator_match max14577_regulator_matches[] = {
146         { .name = "SAFEOUT", },
147         { .name = "CHARGER", },
148 };
149 
150 static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
151 {
152         int ret;
153         struct device_node *np;
154 
155         np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
156         if (!np) {
157                 dev_err(&pdev->dev, "Failed to get child OF node for regulators\n");
158                 return -EINVAL;
159         }
160 
161         ret = of_regulator_match(&pdev->dev, np, max14577_regulator_matches,
162                         MAX14577_REG_MAX);
163         if (ret < 0)
164                 dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret);
165         else
166                 ret = 0;
167 
168         of_node_put(np);
169 
170         return ret;
171 }
172 
173 static inline struct regulator_init_data *match_init_data(int index)
174 {
175         return max14577_regulator_matches[index].init_data;
176 }
177 
178 static inline struct device_node *match_of_node(int index)
179 {
180         return max14577_regulator_matches[index].of_node;
181 }
182 #else /* CONFIG_OF */
183 static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
184 {
185         return 0;
186 }
187 static inline struct regulator_init_data *match_init_data(int index)
188 {
189         return NULL;
190 }
191 
192 static inline struct device_node *match_of_node(int index)
193 {
194         return NULL;
195 }
196 #endif /* CONFIG_OF */
197 
198 
199 static int max14577_regulator_probe(struct platform_device *pdev)
200 {
201         struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
202         struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
203         int i, ret;
204         struct regulator_config config = {};
205 
206         ret = max14577_regulator_dt_parse_pdata(pdev);
207         if (ret)
208                 return ret;
209 
210         config.dev = &pdev->dev;
211         config.regmap = max14577->regmap;
212 
213         for (i = 0; i < ARRAY_SIZE(supported_regulators); i++) {
214                 struct regulator_dev *regulator;
215                 /*
216                  * Index of supported_regulators[] is also the id and must
217                  * match index of pdata->regulators[].
218                  */
219                 if (pdata && pdata->regulators) {
220                         config.init_data = pdata->regulators[i].initdata;
221                         config.of_node = pdata->regulators[i].of_node;
222                 } else {
223                         config.init_data = match_init_data(i);
224                         config.of_node = match_of_node(i);
225                 }
226 
227                 regulator = devm_regulator_register(&pdev->dev,
228                                 &supported_regulators[i], &config);
229                 if (IS_ERR(regulator)) {
230                         ret = PTR_ERR(regulator);
231                         dev_err(&pdev->dev,
232                                         "Regulator init failed for ID %d with error: %d\n",
233                                         i, ret);
234                         return ret;
235                 }
236         }
237 
238         return ret;
239 }
240 
241 static struct platform_driver max14577_regulator_driver = {
242         .driver = {
243                    .owner = THIS_MODULE,
244                    .name = "max14577-regulator",
245                    },
246         .probe  = max14577_regulator_probe,
247 };
248 
249 static int __init max14577_regulator_init(void)
250 {
251         BUILD_BUG_ON(MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
252                         MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf !=
253                         MAX14577_REGULATOR_CURRENT_LIMIT_MAX);
254         BUILD_BUG_ON(ARRAY_SIZE(supported_regulators) != MAX14577_REG_MAX);
255 
256         return platform_driver_register(&max14577_regulator_driver);
257 }
258 subsys_initcall(max14577_regulator_init);
259 
260 static void __exit max14577_regulator_exit(void)
261 {
262         platform_driver_unregister(&max14577_regulator_driver);
263 }
264 module_exit(max14577_regulator_exit);
265 
266 MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
267 MODULE_DESCRIPTION("MAXIM 14577 regulator driver");
268 MODULE_LICENSE("GPL");
269 MODULE_ALIAS("platform:max14577-regulator");
270 

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