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Linux/drivers/mfd/max77686.c

  1 /*
  2  * max77686.c - mfd core driver for the Maxim 77686
  3  *
  4  * Copyright (C) 2012 Samsung Electronics
  5  * Chiwoong Byun <woong.byun@smasung.com>
  6  * Jonghwa Lee <jonghwa3.lee@samsung.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 max8997.c
 23  */
 24 
 25 #include <linux/export.h>
 26 #include <linux/slab.h>
 27 #include <linux/i2c.h>
 28 #include <linux/pm_runtime.h>
 29 #include <linux/module.h>
 30 #include <linux/mfd/core.h>
 31 #include <linux/mfd/max77686.h>
 32 #include <linux/mfd/max77686-private.h>
 33 #include <linux/err.h>
 34 #include <linux/of.h>
 35 
 36 #define I2C_ADDR_RTC    (0x0C >> 1)
 37 
 38 static const struct mfd_cell max77686_devs[] = {
 39         { .name = "max77686-pmic", },
 40         { .name = "max77686-rtc", },
 41         { .name = "max77686-clk", },
 42 };
 43 
 44 static struct regmap_config max77686_regmap_config = {
 45         .reg_bits = 8,
 46         .val_bits = 8,
 47 };
 48 
 49 #ifdef CONFIG_OF
 50 static const struct of_device_id max77686_pmic_dt_match[] = {
 51         {.compatible = "maxim,max77686", .data = NULL},
 52         {},
 53 };
 54 
 55 static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
 56                                                                   *dev)
 57 {
 58         struct max77686_platform_data *pd;
 59 
 60         pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 61         if (!pd) {
 62                 dev_err(dev, "could not allocate memory for pdata\n");
 63                 return NULL;
 64         }
 65 
 66         dev->platform_data = pd;
 67         return pd;
 68 }
 69 #else
 70 static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
 71                                                                   *dev)
 72 {
 73         return 0;
 74 }
 75 #endif
 76 
 77 static int max77686_i2c_probe(struct i2c_client *i2c,
 78                               const struct i2c_device_id *id)
 79 {
 80         struct max77686_dev *max77686 = NULL;
 81         struct max77686_platform_data *pdata = dev_get_platdata(&i2c->dev);
 82         unsigned int data;
 83         int ret = 0;
 84 
 85         if (i2c->dev.of_node)
 86                 pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
 87 
 88         if (!pdata) {
 89                 dev_err(&i2c->dev, "No platform data found.\n");
 90                 return -EIO;
 91         }
 92 
 93         max77686 = devm_kzalloc(&i2c->dev,
 94                                 sizeof(struct max77686_dev), GFP_KERNEL);
 95         if (max77686 == NULL)
 96                 return -ENOMEM;
 97 
 98         i2c_set_clientdata(i2c, max77686);
 99         max77686->dev = &i2c->dev;
100         max77686->i2c = i2c;
101         max77686->type = id->driver_data;
102 
103         max77686->wakeup = pdata->wakeup;
104         max77686->irq_gpio = pdata->irq_gpio;
105         max77686->irq = i2c->irq;
106 
107         max77686->regmap = devm_regmap_init_i2c(i2c, &max77686_regmap_config);
108         if (IS_ERR(max77686->regmap)) {
109                 ret = PTR_ERR(max77686->regmap);
110                 dev_err(max77686->dev, "Failed to allocate register map: %d\n",
111                                 ret);
112                 return ret;
113         }
114 
115         if (regmap_read(max77686->regmap,
116                          MAX77686_REG_DEVICE_ID, &data) < 0) {
117                 dev_err(max77686->dev,
118                         "device not found on this channel (this is not an error)\n");
119                 return -ENODEV;
120         } else
121                 dev_info(max77686->dev, "device found\n");
122 
123         max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
124         if (!max77686->rtc) {
125                 dev_err(max77686->dev, "Failed to allocate I2C device for RTC\n");
126                 return -ENODEV;
127         }
128         i2c_set_clientdata(max77686->rtc, max77686);
129 
130         max77686_irq_init(max77686);
131 
132         ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
133                               ARRAY_SIZE(max77686_devs), NULL, 0, NULL);
134         if (ret < 0) {
135                 mfd_remove_devices(max77686->dev);
136                 i2c_unregister_device(max77686->rtc);
137         }
138 
139         return ret;
140 }
141 
142 static int max77686_i2c_remove(struct i2c_client *i2c)
143 {
144         struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
145 
146         mfd_remove_devices(max77686->dev);
147         i2c_unregister_device(max77686->rtc);
148 
149         return 0;
150 }
151 
152 static const struct i2c_device_id max77686_i2c_id[] = {
153         { "max77686", TYPE_MAX77686 },
154         { }
155 };
156 MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
157 
158 static struct i2c_driver max77686_i2c_driver = {
159         .driver = {
160                    .name = "max77686",
161                    .owner = THIS_MODULE,
162                    .of_match_table = of_match_ptr(max77686_pmic_dt_match),
163         },
164         .probe = max77686_i2c_probe,
165         .remove = max77686_i2c_remove,
166         .id_table = max77686_i2c_id,
167 };
168 
169 static int __init max77686_i2c_init(void)
170 {
171         return i2c_add_driver(&max77686_i2c_driver);
172 }
173 /* init early so consumer devices can complete system boot */
174 subsys_initcall(max77686_i2c_init);
175 
176 static void __exit max77686_i2c_exit(void)
177 {
178         i2c_del_driver(&max77686_i2c_driver);
179 }
180 module_exit(max77686_i2c_exit);
181 
182 MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
183 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
184 MODULE_LICENSE("GPL");
185 

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