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Linux/drivers/regulator/max77693.c

  1 /*
  2  * max77693.c - Regulator driver for the Maxim 77693
  3  *
  4  * Copyright (C) 2013 Samsung Electronics
  5  * Jonghwa Lee <jonghwa3.lee@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  * You should have received a copy of the GNU General Public License
 18  * along with this program; if not, write to the Free Software
 19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 20  *
 21  * This driver is based on max77686.c
 22  */
 23 
 24 #include <linux/err.h>
 25 #include <linux/slab.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/module.h>
 28 #include <linux/export.h>
 29 #include <linux/regulator/driver.h>
 30 #include <linux/regulator/machine.h>
 31 #include <linux/mfd/max77693.h>
 32 #include <linux/mfd/max77693-private.h>
 33 #include <linux/regulator/of_regulator.h>
 34 
 35 #define CHGIN_ILIM_STEP_20mA                    20000
 36 
 37 /* CHARGER regulator ops */
 38 /* CHARGER regulator uses two bits for enabling */
 39 static int max77693_chg_is_enabled(struct regulator_dev *rdev)
 40 {
 41         int ret;
 42         u8 val;
 43 
 44         ret = max77693_read_reg(rdev->regmap, rdev->desc->enable_reg, &val);
 45         if (ret)
 46                 return ret;
 47 
 48         return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask;
 49 }
 50 
 51 /*
 52  * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
 53  * 0x00, 0x01, 0x2, 0x03        = 60 mA
 54  * 0x04 ~ 0x7E                  = (60 + (X - 3) * 20) mA
 55  */
 56 static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
 57 {
 58         unsigned int chg_min_uA = rdev->constraints->min_uA;
 59         unsigned int chg_max_uA = rdev->constraints->max_uA;
 60         u8 reg, sel;
 61         unsigned int val;
 62         int ret;
 63 
 64         ret = max77693_read_reg(rdev->regmap,
 65                                 MAX77693_CHG_REG_CHG_CNFG_09, &reg);
 66         if (ret < 0)
 67                 return ret;
 68 
 69         sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK;
 70 
 71         /* the first four codes for charger current are all 60mA */
 72         if (sel <= 3)
 73                 sel = 0;
 74         else
 75                 sel -= 3;
 76 
 77         val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel;
 78         if (val > chg_max_uA)
 79                 return -EINVAL;
 80 
 81         return val;
 82 }
 83 
 84 static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
 85                                                 int min_uA, int max_uA)
 86 {
 87         unsigned int chg_min_uA = rdev->constraints->min_uA;
 88         int sel = 0;
 89 
 90         while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA)
 91                 sel++;
 92 
 93         if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA)
 94                 return -EINVAL;
 95 
 96         /* the first four codes for charger current are all 60mA */
 97         sel += 3;
 98 
 99         return max77693_write_reg(rdev->regmap,
100                                 MAX77693_CHG_REG_CHG_CNFG_09, sel);
101 }
102 /* end of CHARGER regulator ops */
103 
104 static const unsigned int max77693_safeout_table[] = {
105         4850000,
106         4900000,
107         4950000,
108         3300000,
109 };
110 
111 static struct regulator_ops max77693_safeout_ops = {
112         .list_voltage           = regulator_list_voltage_table,
113         .is_enabled             = regulator_is_enabled_regmap,
114         .enable                 = regulator_enable_regmap,
115         .disable                = regulator_disable_regmap,
116         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
117         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
118 };
119 
120 static struct regulator_ops max77693_charger_ops = {
121         .is_enabled             = max77693_chg_is_enabled,
122         .enable                 = regulator_enable_regmap,
123         .disable                = regulator_disable_regmap,
124         .get_current_limit      = max77693_chg_get_current_limit,
125         .set_current_limit      = max77693_chg_set_current_limit,
126 };
127 
128 #define regulator_desc_esafeout(_num)   {                       \
129         .name           = "ESAFEOUT"#_num,                      \
130         .id             = MAX77693_ESAFEOUT##_num,              \
131         .n_voltages     = 4,                                    \
132         .ops            = &max77693_safeout_ops,                \
133         .type           = REGULATOR_VOLTAGE,                    \
134         .owner          = THIS_MODULE,                          \
135         .volt_table     = max77693_safeout_table,               \
136         .vsel_reg       = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
137         .vsel_mask      = SAFEOUT_CTRL_SAFEOUT##_num##_MASK,    \
138         .enable_reg     = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
139         .enable_mask    = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
140 }
141 
142 static struct regulator_desc regulators[] = {
143         regulator_desc_esafeout(1),
144         regulator_desc_esafeout(2),
145         {
146                 .name = "CHARGER",
147                 .id = MAX77693_CHARGER,
148                 .ops = &max77693_charger_ops,
149                 .type = REGULATOR_CURRENT,
150                 .owner = THIS_MODULE,
151                 .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
152                 .enable_mask = CHG_CNFG_00_CHG_MASK |
153                                 CHG_CNFG_00_BUCK_MASK,
154         },
155 };
156 
157 #ifdef CONFIG_OF
158 static int max77693_pmic_dt_parse_rdata(struct device *dev,
159                                         struct max77693_regulator_data **rdata)
160 {
161         struct device_node *np;
162         struct of_regulator_match *rmatch;
163         struct max77693_regulator_data *tmp;
164         int i, matched = 0;
165 
166         np = of_get_child_by_name(dev->parent->of_node, "regulators");
167         if (!np)
168                 return -EINVAL;
169 
170         rmatch = devm_kzalloc(dev,
171                  sizeof(*rmatch) * ARRAY_SIZE(regulators), GFP_KERNEL);
172         if (!rmatch) {
173                 of_node_put(np);
174                 return -ENOMEM;
175         }
176 
177         for (i = 0; i < ARRAY_SIZE(regulators); i++)
178                 rmatch[i].name = regulators[i].name;
179 
180         matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators));
181         of_node_put(np);
182         if (matched <= 0)
183                 return matched;
184         *rdata = devm_kzalloc(dev, sizeof(**rdata) * matched, GFP_KERNEL);
185         if (!(*rdata))
186                 return -ENOMEM;
187 
188         tmp = *rdata;
189 
190         for (i = 0; i < matched; i++) {
191                 tmp->initdata = rmatch[i].init_data;
192                 tmp->of_node = rmatch[i].of_node;
193                 tmp->id = regulators[i].id;
194                 tmp++;
195         }
196 
197         return matched;
198 }
199 #else
200 static int max77693_pmic_dt_parse_rdata(struct device *dev,
201                                         struct max77693_regulator_data **rdata)
202 {
203         return 0;
204 }
205 #endif /* CONFIG_OF */
206 
207 static int max77693_pmic_init_rdata(struct device *dev,
208                                     struct max77693_regulator_data **rdata)
209 {
210         struct max77693_platform_data *pdata;
211         int num_regulators = 0;
212 
213         pdata = dev_get_platdata(dev->parent);
214         if (pdata) {
215                 *rdata = pdata->regulators;
216                 num_regulators = pdata->num_regulators;
217         }
218 
219         if (!(*rdata) && dev->parent->of_node)
220                 num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata);
221 
222         return num_regulators;
223 }
224 
225 static int max77693_pmic_probe(struct platform_device *pdev)
226 {
227         struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
228         struct max77693_regulator_data *rdata = NULL;
229         int num_rdata, i;
230         struct regulator_config config;
231 
232         num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata);
233         if (!rdata || num_rdata <= 0) {
234                 dev_err(&pdev->dev, "No init data supplied.\n");
235                 return -ENODEV;
236         }
237 
238         config.dev = &pdev->dev;
239         config.regmap = iodev->regmap;
240 
241         for (i = 0; i < num_rdata; i++) {
242                 int id = rdata[i].id;
243                 struct regulator_dev *rdev;
244 
245                 config.init_data = rdata[i].initdata;
246                 config.of_node = rdata[i].of_node;
247 
248                 rdev = devm_regulator_register(&pdev->dev,
249                                                 &regulators[id], &config);
250                 if (IS_ERR(rdev)) {
251                         dev_err(&pdev->dev,
252                                 "Failed to initialize regulator-%d\n", id);
253                         return PTR_ERR(rdev);
254                 }
255         }
256 
257         return 0;
258 }
259 
260 static const struct platform_device_id max77693_pmic_id[] = {
261         {"max77693-pmic", 0},
262         {},
263 };
264 
265 MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
266 
267 static struct platform_driver max77693_pmic_driver = {
268         .driver = {
269                    .name = "max77693-pmic",
270                    .owner = THIS_MODULE,
271                    },
272         .probe = max77693_pmic_probe,
273         .id_table = max77693_pmic_id,
274 };
275 
276 module_platform_driver(max77693_pmic_driver);
277 
278 MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
279 MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
280 MODULE_LICENSE("GPL");
281 

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