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