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