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 35 #define I2C_ADDR_RTC (0x0C >> 1) 36 37 static struct mfd_cell max77686_devs[] = { 38 { .name = "max77686-pmic", }, 39 { .name = "max77686-rtc", }, 40 }; 41 42 static struct regmap_config max77686_regmap_config = { 43 .reg_bits = 8, 44 .val_bits = 8, 45 }; 46 47 #ifdef CONFIG_OF 48 static struct of_device_id max77686_pmic_dt_match[] = { 49 {.compatible = "maxim,max77686", .data = 0}, 50 {}, 51 }; 52 53 static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device 54 *dev) 55 { 56 struct max77686_platform_data *pd; 57 58 pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); 59 if (!pd) { 60 dev_err(dev, "could not allocate memory for pdata\n"); 61 return NULL; 62 } 63 64 dev->platform_data = pd; 65 return pd; 66 } 67 #else 68 static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device 69 *dev) 70 { 71 return 0; 72 } 73 #endif 74 75 static int max77686_i2c_probe(struct i2c_client *i2c, 76 const struct i2c_device_id *id) 77 { 78 struct max77686_dev *max77686 = NULL; 79 struct max77686_platform_data *pdata = i2c->dev.platform_data; 80 unsigned int data; 81 int ret = 0; 82 83 if (i2c->dev.of_node) 84 pdata = max77686_i2c_parse_dt_pdata(&i2c->dev); 85 86 if (!pdata) { 87 ret = -EIO; 88 dev_err(&i2c->dev, "No platform data found.\n"); 89 goto err; 90 } 91 92 max77686 = kzalloc(sizeof(struct max77686_dev), GFP_KERNEL); 93 if (max77686 == NULL) 94 return -ENOMEM; 95 96 max77686->regmap = regmap_init_i2c(i2c, &max77686_regmap_config); 97 if (IS_ERR(max77686->regmap)) { 98 ret = PTR_ERR(max77686->regmap); 99 dev_err(max77686->dev, "Failed to allocate register map: %d\n", 100 ret); 101 kfree(max77686); 102 return ret; 103 } 104 105 i2c_set_clientdata(i2c, max77686); 106 max77686->dev = &i2c->dev; 107 max77686->i2c = i2c; 108 max77686->type = id->driver_data; 109 110 max77686->wakeup = pdata->wakeup; 111 max77686->irq_gpio = pdata->irq_gpio; 112 max77686->irq = i2c->irq; 113 114 if (regmap_read(max77686->regmap, 115 MAX77686_REG_DEVICE_ID, &data) < 0) { 116 dev_err(max77686->dev, 117 "device not found on this channel (this is not an error)\n"); 118 ret = -ENODEV; 119 goto err; 120 } else 121 dev_info(max77686->dev, "device found\n"); 122 123 max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC); 124 i2c_set_clientdata(max77686->rtc, max77686); 125 126 max77686_irq_init(max77686); 127 128 ret = mfd_add_devices(max77686->dev, -1, max77686_devs, 129 ARRAY_SIZE(max77686_devs), NULL, 0, NULL); 130 131 if (ret < 0) 132 goto err_mfd; 133 134 return ret; 135 136 err_mfd: 137 mfd_remove_devices(max77686->dev); 138 i2c_unregister_device(max77686->rtc); 139 err: 140 kfree(max77686); 141 return ret; 142 } 143 144 static int max77686_i2c_remove(struct i2c_client *i2c) 145 { 146 struct max77686_dev *max77686 = i2c_get_clientdata(i2c); 147 148 mfd_remove_devices(max77686->dev); 149 i2c_unregister_device(max77686->rtc); 150 kfree(max77686); 151 152 return 0; 153 } 154 155 static const struct i2c_device_id max77686_i2c_id[] = { 156 { "max77686", TYPE_MAX77686 }, 157 { } 158 }; 159 MODULE_DEVICE_TABLE(i2c, max77686_i2c_id); 160 161 static struct i2c_driver max77686_i2c_driver = { 162 .driver = { 163 .name = "max77686", 164 .owner = THIS_MODULE, 165 .of_match_table = of_match_ptr(max77686_pmic_dt_match), 166 }, 167 .probe = max77686_i2c_probe, 168 .remove = max77686_i2c_remove, 169 .id_table = max77686_i2c_id, 170 }; 171 172 static int __init max77686_i2c_init(void) 173 { 174 return i2c_add_driver(&max77686_i2c_driver); 175 } 176 /* init early so consumer devices can complete system boot */ 177 subsys_initcall(max77686_i2c_init); 178 179 static void __exit max77686_i2c_exit(void) 180 { 181 i2c_del_driver(&max77686_i2c_driver); 182 } 183 module_exit(max77686_i2c_exit); 184 185 MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver"); 186 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>"); 187 MODULE_LICENSE("GPL"); 188