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Linux/drivers/mfd/max77693.c

  1 /*
  2  * max77693.c - mfd core driver for the MAX 77693
  3  *
  4  * Copyright (C) 2012 Samsung Electronics
  5  * SangYoung Son <hello.son@smasung.com>
  6  *
  7  * This program is not provided / owned by Maxim Integrated Products.
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License as published by
 11  * the Free Software Foundation; either version 2 of the License, or
 12  * (at your option) any later version.
 13  *
 14  * This program is distributed in the hope that it will be useful,
 15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 17  * GNU General Public License for more details.
 18  *
 19  * You should have received a copy of the GNU General Public License
 20  * along with this program; if not, write to the Free Software
 21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 22  *
 23  * This driver is based on max8997.c
 24  */
 25 
 26 #include <linux/module.h>
 27 #include <linux/slab.h>
 28 #include <linux/i2c.h>
 29 #include <linux/err.h>
 30 #include <linux/interrupt.h>
 31 #include <linux/of.h>
 32 #include <linux/pm_runtime.h>
 33 #include <linux/mutex.h>
 34 #include <linux/mfd/core.h>
 35 #include <linux/mfd/max77693.h>
 36 #include <linux/mfd/max77693-private.h>
 37 #include <linux/regulator/machine.h>
 38 #include <linux/regmap.h>
 39 
 40 #define I2C_ADDR_PMIC   (0xCC >> 1)     /* Charger, Flash LED */
 41 #define I2C_ADDR_MUIC   (0x4A >> 1)
 42 #define I2C_ADDR_HAPTIC (0x90 >> 1)
 43 
 44 static const struct mfd_cell max77693_devs[] = {
 45         { .name = "max77693-pmic", },
 46         { .name = "max77693-charger", },
 47         { .name = "max77693-flash", },
 48         { .name = "max77693-muic", },
 49         { .name = "max77693-haptic", },
 50 };
 51 
 52 int max77693_read_reg(struct regmap *map, u8 reg, u8 *dest)
 53 {
 54         unsigned int val;
 55         int ret;
 56 
 57         ret = regmap_read(map, reg, &val);
 58         *dest = val;
 59 
 60         return ret;
 61 }
 62 EXPORT_SYMBOL_GPL(max77693_read_reg);
 63 
 64 int max77693_bulk_read(struct regmap *map, u8 reg, int count, u8 *buf)
 65 {
 66         int ret;
 67 
 68         ret = regmap_bulk_read(map, reg, buf, count);
 69 
 70         return ret;
 71 }
 72 EXPORT_SYMBOL_GPL(max77693_bulk_read);
 73 
 74 int max77693_write_reg(struct regmap *map, u8 reg, u8 value)
 75 {
 76         int ret;
 77 
 78         ret = regmap_write(map, reg, value);
 79 
 80         return ret;
 81 }
 82 EXPORT_SYMBOL_GPL(max77693_write_reg);
 83 
 84 int max77693_bulk_write(struct regmap *map, u8 reg, int count, u8 *buf)
 85 {
 86         int ret;
 87 
 88         ret = regmap_bulk_write(map, reg, buf, count);
 89 
 90         return ret;
 91 }
 92 EXPORT_SYMBOL_GPL(max77693_bulk_write);
 93 
 94 int max77693_update_reg(struct regmap *map, u8 reg, u8 val, u8 mask)
 95 {
 96         int ret;
 97 
 98         ret = regmap_update_bits(map, reg, mask, val);
 99 
100         return ret;
101 }
102 EXPORT_SYMBOL_GPL(max77693_update_reg);
103 
104 static const struct regmap_config max77693_regmap_config = {
105         .reg_bits = 8,
106         .val_bits = 8,
107         .max_register = MAX77693_PMIC_REG_END,
108 };
109 
110 static const struct regmap_config max77693_regmap_muic_config = {
111         .reg_bits = 8,
112         .val_bits = 8,
113         .max_register = MAX77693_MUIC_REG_END,
114 };
115 
116 static int max77693_i2c_probe(struct i2c_client *i2c,
117                               const struct i2c_device_id *id)
118 {
119         struct max77693_dev *max77693;
120         u8 reg_data;
121         int ret = 0;
122 
123         max77693 = devm_kzalloc(&i2c->dev,
124                         sizeof(struct max77693_dev), GFP_KERNEL);
125         if (max77693 == NULL)
126                 return -ENOMEM;
127 
128         i2c_set_clientdata(i2c, max77693);
129         max77693->dev = &i2c->dev;
130         max77693->i2c = i2c;
131         max77693->irq = i2c->irq;
132         max77693->type = id->driver_data;
133 
134         max77693->regmap = devm_regmap_init_i2c(i2c, &max77693_regmap_config);
135         if (IS_ERR(max77693->regmap)) {
136                 ret = PTR_ERR(max77693->regmap);
137                 dev_err(max77693->dev, "failed to allocate register map: %d\n",
138                                 ret);
139                 return ret;
140         }
141 
142         ret = max77693_read_reg(max77693->regmap, MAX77693_PMIC_REG_PMIC_ID2,
143                                 &reg_data);
144         if (ret < 0) {
145                 dev_err(max77693->dev, "device not found on this channel\n");
146                 return ret;
147         } else
148                 dev_info(max77693->dev, "device ID: 0x%x\n", reg_data);
149 
150         max77693->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC);
151         if (!max77693->muic) {
152                 dev_err(max77693->dev, "Failed to allocate I2C device for MUIC\n");
153                 return -ENODEV;
154         }
155         i2c_set_clientdata(max77693->muic, max77693);
156 
157         max77693->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC);
158         if (!max77693->haptic) {
159                 dev_err(max77693->dev, "Failed to allocate I2C device for Haptic\n");
160                 ret = -ENODEV;
161                 goto err_i2c_haptic;
162         }
163         i2c_set_clientdata(max77693->haptic, max77693);
164 
165         /*
166          * Initialize register map for MUIC device because use regmap-muic
167          * instance of MUIC device when irq of max77693 is initialized
168          * before call max77693-muic probe() function.
169          */
170         max77693->regmap_muic = devm_regmap_init_i2c(max77693->muic,
171                                          &max77693_regmap_muic_config);
172         if (IS_ERR(max77693->regmap_muic)) {
173                 ret = PTR_ERR(max77693->regmap_muic);
174                 dev_err(max77693->dev,
175                         "failed to allocate register map: %d\n", ret);
176                 goto err_regmap_muic;
177         }
178 
179         ret = max77693_irq_init(max77693);
180         if (ret < 0)
181                 goto err_irq;
182 
183         pm_runtime_set_active(max77693->dev);
184 
185         ret = mfd_add_devices(max77693->dev, -1, max77693_devs,
186                               ARRAY_SIZE(max77693_devs), NULL, 0, NULL);
187         if (ret < 0)
188                 goto err_mfd;
189 
190         return ret;
191 
192 err_mfd:
193         max77693_irq_exit(max77693);
194 err_irq:
195 err_regmap_muic:
196         i2c_unregister_device(max77693->haptic);
197 err_i2c_haptic:
198         i2c_unregister_device(max77693->muic);
199         return ret;
200 }
201 
202 static int max77693_i2c_remove(struct i2c_client *i2c)
203 {
204         struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
205 
206         mfd_remove_devices(max77693->dev);
207         max77693_irq_exit(max77693);
208         i2c_unregister_device(max77693->muic);
209         i2c_unregister_device(max77693->haptic);
210 
211         return 0;
212 }
213 
214 static const struct i2c_device_id max77693_i2c_id[] = {
215         { "max77693", TYPE_MAX77693 },
216         { }
217 };
218 MODULE_DEVICE_TABLE(i2c, max77693_i2c_id);
219 
220 static int max77693_suspend(struct device *dev)
221 {
222         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
223         struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
224 
225         if (device_may_wakeup(dev))
226                 irq_set_irq_wake(max77693->irq, 1);
227         return 0;
228 }
229 
230 static int max77693_resume(struct device *dev)
231 {
232         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
233         struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
234 
235         if (device_may_wakeup(dev))
236                 irq_set_irq_wake(max77693->irq, 0);
237         return max77693_irq_resume(max77693);
238 }
239 
240 static const struct dev_pm_ops max77693_pm = {
241         .suspend = max77693_suspend,
242         .resume = max77693_resume,
243 };
244 
245 #ifdef CONFIG_OF
246 static const struct of_device_id max77693_dt_match[] = {
247         { .compatible = "maxim,max77693" },
248         {},
249 };
250 #endif
251 
252 static struct i2c_driver max77693_i2c_driver = {
253         .driver = {
254                    .name = "max77693",
255                    .owner = THIS_MODULE,
256                    .pm = &max77693_pm,
257                    .of_match_table = of_match_ptr(max77693_dt_match),
258         },
259         .probe = max77693_i2c_probe,
260         .remove = max77693_i2c_remove,
261         .id_table = max77693_i2c_id,
262 };
263 
264 static int __init max77693_i2c_init(void)
265 {
266         return i2c_add_driver(&max77693_i2c_driver);
267 }
268 /* init early so consumer devices can complete system boot */
269 subsys_initcall(max77693_i2c_init);
270 
271 static void __exit max77693_i2c_exit(void)
272 {
273         i2c_del_driver(&max77693_i2c_driver);
274 }
275 module_exit(max77693_i2c_exit);
276 
277 MODULE_DESCRIPTION("MAXIM 77693 multi-function core driver");
278 MODULE_AUTHOR("SangYoung, Son <hello.son@samsung.com>");
279 MODULE_LICENSE("GPL");
280 

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