Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

Linux/drivers/regulator/max77693.c

  1 /*
  2  * max77693.c - Regulator driver for the Maxim 77693 and 77843
  3  *
  4  * Copyright (C) 2013-2015 Samsung Electronics
  5  * Jonghwa Lee <jonghwa3.lee@samsung.com>
  6  * Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 21  *
 22  * This driver is based on max77686.c
 23  */
 24 
 25 #include <linux/err.h>
 26 #include <linux/slab.h>
 27 #include <linux/platform_device.h>
 28 #include <linux/module.h>
 29 #include <linux/export.h>
 30 #include <linux/regulator/driver.h>
 31 #include <linux/regulator/machine.h>
 32 #include <linux/mfd/max77693.h>
 33 #include <linux/mfd/max77693-common.h>
 34 #include <linux/mfd/max77693-private.h>
 35 #include <linux/mfd/max77843-private.h>
 36 #include <linux/regulator/of_regulator.h>
 37 #include <linux/regmap.h>
 38 
 39 /*
 40  * ID for MAX77843 regulators.
 41  * There is no need for such for MAX77693.
 42  */
 43 enum max77843_regulator_type {
 44         MAX77843_SAFEOUT1 = 0,
 45         MAX77843_SAFEOUT2,
 46         MAX77843_CHARGER,
 47 
 48         MAX77843_NUM,
 49 };
 50 
 51 /* Register differences between chargers: MAX77693 and MAX77843 */
 52 struct chg_reg_data {
 53         unsigned int linear_reg;
 54         unsigned int linear_mask;
 55         unsigned int uA_step;
 56         unsigned int min_sel;
 57 };
 58 
 59 /*
 60  * MAX77693 CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
 61  * 0x00, 0x01, 0x2, 0x03        = 60 mA
 62  * 0x04 ~ 0x7E                  = (60 + (X - 3) * 20) mA
 63  * Actually for MAX77693 the driver manipulates the maximum input current,
 64  * not the fast charge current (output). This should be fixed.
 65  *
 66  * On MAX77843 the calculation formula is the same (except values).
 67  * Fortunately it properly manipulates the fast charge current.
 68  */
 69 static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
 70 {
 71         const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev);
 72         unsigned int chg_min_uA = rdev->constraints->min_uA;
 73         unsigned int chg_max_uA = rdev->constraints->max_uA;
 74         unsigned int reg, sel;
 75         unsigned int val;
 76         int ret;
 77 
 78         ret = regmap_read(rdev->regmap, reg_data->linear_reg, &reg);
 79         if (ret < 0)
 80                 return ret;
 81 
 82         sel = reg & reg_data->linear_mask;
 83 
 84         /* the first four codes for charger current are all 60mA */
 85         if (sel <= reg_data->min_sel)
 86                 sel = 0;
 87         else
 88                 sel -= reg_data->min_sel;
 89 
 90         val = chg_min_uA + reg_data->uA_step * sel;
 91         if (val > chg_max_uA)
 92                 return -EINVAL;
 93 
 94         return val;
 95 }
 96 
 97 static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
 98                                                 int min_uA, int max_uA)
 99 {
100         const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev);
101         unsigned int chg_min_uA = rdev->constraints->min_uA;
102         int sel = 0;
103 
104         while (chg_min_uA + reg_data->uA_step * sel < min_uA)
105                 sel++;
106 
107         if (chg_min_uA + reg_data->uA_step * sel > max_uA)
108                 return -EINVAL;
109 
110         /* the first four codes for charger current are all 60mA */
111         sel += reg_data->min_sel;
112 
113         return regmap_write(rdev->regmap, reg_data->linear_reg, sel);
114 }
115 /* end of CHARGER regulator ops */
116 
117 /* Returns regmap suitable for given regulator on chosen device */
118 static struct regmap *max77693_get_regmap(enum max77693_types type,
119                                           struct max77693_dev *max77693,
120                                           int reg_id)
121 {
122         if (type == TYPE_MAX77693)
123                 return max77693->regmap;
124 
125         /* Else: TYPE_MAX77843 */
126         switch (reg_id) {
127         case MAX77843_SAFEOUT1:
128         case MAX77843_SAFEOUT2:
129                 return max77693->regmap;
130         case MAX77843_CHARGER:
131                 return max77693->regmap_chg;
132         default:
133                 return max77693->regmap;
134         }
135 }
136 
137 static const unsigned int max77693_safeout_table[] = {
138         4850000,
139         4900000,
140         4950000,
141         3300000,
142 };
143 
144 static struct regulator_ops max77693_safeout_ops = {
145         .list_voltage           = regulator_list_voltage_table,
146         .is_enabled             = regulator_is_enabled_regmap,
147         .enable                 = regulator_enable_regmap,
148         .disable                = regulator_disable_regmap,
149         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
150         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
151 };
152 
153 static struct regulator_ops max77693_charger_ops = {
154         .is_enabled             = regulator_is_enabled_regmap,
155         .enable                 = regulator_enable_regmap,
156         .disable                = regulator_disable_regmap,
157         .get_current_limit      = max77693_chg_get_current_limit,
158         .set_current_limit      = max77693_chg_set_current_limit,
159 };
160 
161 #define max77693_regulator_desc_esafeout(_num)  {               \
162         .name           = "ESAFEOUT"#_num,                      \
163         .id             = MAX77693_ESAFEOUT##_num,              \
164         .of_match       = of_match_ptr("ESAFEOUT"#_num),        \
165         .regulators_node        = of_match_ptr("regulators"),   \
166         .n_voltages     = 4,                                    \
167         .ops            = &max77693_safeout_ops,                \
168         .type           = REGULATOR_VOLTAGE,                    \
169         .owner          = THIS_MODULE,                          \
170         .volt_table     = max77693_safeout_table,               \
171         .vsel_reg       = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
172         .vsel_mask      = SAFEOUT_CTRL_SAFEOUT##_num##_MASK,    \
173         .enable_reg     = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
174         .enable_mask    = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
175 }
176 
177 static const struct regulator_desc max77693_supported_regulators[] = {
178         max77693_regulator_desc_esafeout(1),
179         max77693_regulator_desc_esafeout(2),
180         {
181                 .name = "CHARGER",
182                 .id = MAX77693_CHARGER,
183                 .of_match = of_match_ptr("CHARGER"),
184                 .regulators_node = of_match_ptr("regulators"),
185                 .ops = &max77693_charger_ops,
186                 .type = REGULATOR_CURRENT,
187                 .owner = THIS_MODULE,
188                 .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
189                 .enable_mask = CHG_CNFG_00_CHG_MASK |
190                                 CHG_CNFG_00_BUCK_MASK,
191                 .enable_val = CHG_CNFG_00_CHG_MASK | CHG_CNFG_00_BUCK_MASK,
192         },
193 };
194 
195 static const struct chg_reg_data max77693_chg_reg_data = {
196         .linear_reg     = MAX77693_CHG_REG_CHG_CNFG_09,
197         .linear_mask    = CHG_CNFG_09_CHGIN_ILIM_MASK,
198         .uA_step        = 20000,
199         .min_sel        = 3,
200 };
201 
202 #define max77843_regulator_desc_esafeout(num)   {                       \
203         .name           = "SAFEOUT" # num,                              \
204         .id             = MAX77843_SAFEOUT ## num,                      \
205         .ops            = &max77693_safeout_ops,                        \
206         .of_match       = of_match_ptr("SAFEOUT" # num),                \
207         .regulators_node = of_match_ptr("regulators"),                  \
208         .type           = REGULATOR_VOLTAGE,                            \
209         .owner          = THIS_MODULE,                                  \
210         .n_voltages     = ARRAY_SIZE(max77693_safeout_table),           \
211         .volt_table     = max77693_safeout_table,                       \
212         .enable_reg     = MAX77843_SYS_REG_SAFEOUTCTRL,                 \
213         .enable_mask    = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT ## num,    \
214         .vsel_reg       = MAX77843_SYS_REG_SAFEOUTCTRL,                 \
215         .vsel_mask      = MAX77843_REG_SAFEOUTCTRL_SAFEOUT ## num ## _MASK, \
216 }
217 
218 static const struct regulator_desc max77843_supported_regulators[] = {
219         [MAX77843_SAFEOUT1] = max77843_regulator_desc_esafeout(1),
220         [MAX77843_SAFEOUT2] = max77843_regulator_desc_esafeout(2),
221         [MAX77843_CHARGER] = {
222                 .name           = "CHARGER",
223                 .id             = MAX77843_CHARGER,
224                 .ops            = &max77693_charger_ops,
225                 .of_match       = of_match_ptr("CHARGER"),
226                 .regulators_node = of_match_ptr("regulators"),
227                 .type           = REGULATOR_CURRENT,
228                 .owner          = THIS_MODULE,
229                 .enable_reg     = MAX77843_CHG_REG_CHG_CNFG_00,
230                 .enable_mask    = MAX77843_CHG_MASK,
231                 .enable_val     = MAX77843_CHG_MASK,
232         },
233 };
234 
235 static const struct chg_reg_data max77843_chg_reg_data = {
236         .linear_reg     = MAX77843_CHG_REG_CHG_CNFG_02,
237         .linear_mask    = MAX77843_CHG_FAST_CHG_CURRENT_MASK,
238         .uA_step        = MAX77843_CHG_FAST_CHG_CURRENT_STEP,
239         .min_sel        = 2,
240 };
241 
242 static int max77693_pmic_probe(struct platform_device *pdev)
243 {
244         enum max77693_types type = platform_get_device_id(pdev)->driver_data;
245         struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
246         const struct regulator_desc *regulators;
247         unsigned int regulators_size;
248         int i;
249         struct regulator_config config = { };
250 
251         config.dev = iodev->dev;
252 
253         switch (type) {
254         case TYPE_MAX77693:
255                 regulators = max77693_supported_regulators;
256                 regulators_size = ARRAY_SIZE(max77693_supported_regulators);
257                 config.driver_data = (void *)&max77693_chg_reg_data;
258                 break;
259         case TYPE_MAX77843:
260                 regulators = max77843_supported_regulators;
261                 regulators_size = ARRAY_SIZE(max77843_supported_regulators);
262                 config.driver_data = (void *)&max77843_chg_reg_data;
263                 break;
264         default:
265                 dev_err(&pdev->dev, "Unsupported device type: %u\n", type);
266                 return -ENODEV;
267         }
268 
269         for (i = 0; i < regulators_size; i++) {
270                 struct regulator_dev *rdev;
271 
272                 config.regmap = max77693_get_regmap(type, iodev,
273                                                     regulators[i].id);
274 
275                 rdev = devm_regulator_register(&pdev->dev,
276                                                 &regulators[i], &config);
277                 if (IS_ERR(rdev)) {
278                         dev_err(&pdev->dev,
279                                 "Failed to initialize regulator-%d\n", i);
280                         return PTR_ERR(rdev);
281                 }
282         }
283 
284         return 0;
285 }
286 
287 static const struct platform_device_id max77693_pmic_id[] = {
288         { "max77693-pmic", TYPE_MAX77693 },
289         { "max77843-regulator", TYPE_MAX77843 },
290         {},
291 };
292 
293 MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
294 
295 static struct platform_driver max77693_pmic_driver = {
296         .driver = {
297                    .name = "max77693-pmic",
298                    },
299         .probe = max77693_pmic_probe,
300         .id_table = max77693_pmic_id,
301 };
302 
303 static int __init max77693_pmic_init(void)
304 {
305         return platform_driver_register(&max77693_pmic_driver);
306 }
307 subsys_initcall(max77693_pmic_init);
308 
309 static void __exit max77693_pmic_cleanup(void)
310 {
311         platform_driver_unregister(&max77693_pmic_driver);
312 }
313 module_exit(max77693_pmic_cleanup);
314 
315 MODULE_DESCRIPTION("MAXIM 77693/77843 regulator driver");
316 MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
317 MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski.k@gmail.com>");
318 MODULE_LICENSE("GPL");
319 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us