projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| dae8a969 JL |
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> | |
| dae8a969 JL |
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 | static int max77686_i2c_probe(struct i2c_client *i2c, | |
| 48 | const struct i2c_device_id *id) | |
| 49 | { | |
| 50 | struct max77686_dev *max77686; | |
| 51 | struct max77686_platform_data *pdata = i2c->dev.platform_data; | |
| 52 | unsigned int data; | |
| 53 | int ret = 0; | |
| 54 | ||
| 55 | max77686 = kzalloc(sizeof(struct max77686_dev), GFP_KERNEL); | |
| 56 | if (max77686 == NULL) | |
| 57 | return -ENOMEM; | |
| 58 | ||
| 59 | max77686->regmap = regmap_init_i2c(i2c, &max77686_regmap_config); | |
| 60 | if (IS_ERR(max77686->regmap)) { | |
| 61 | ret = PTR_ERR(max77686->regmap); | |
| 62 | dev_err(max77686->dev, "Failed to allocate register map: %d\n", | |
| 63 | ret); | |
| 64 | kfree(max77686); | |
| 65 | return ret; | |
| 66 | } | |
| 67 | ||
| 68 | i2c_set_clientdata(i2c, max77686); | |
| 69 | max77686->dev = &i2c->dev; | |
| 70 | max77686->i2c = i2c; | |
| 71 | max77686->type = id->driver_data; | |
| 72 | ||
| 73 | if (!pdata) { | |
| 74 | ret = -EIO; | |
| 75 | goto err; | |
| 76 | } | |
| 77 | ||
| 78 | max77686->wakeup = pdata->wakeup; | |
| 79 | max77686->irq_gpio = pdata->irq_gpio; | |
| 2b40459b | 80 | max77686->irq = i2c->irq; |
| dae8a969 | 81 | |
| dae8a969 JL |
82 | if (regmap_read(max77686->regmap, |
| 83 | MAX77686_REG_DEVICE_ID, &data) < 0) { | |
| 84 | dev_err(max77686->dev, | |
| 85 | "device not found on this channel (this is not an error)\n"); | |
| 86 | ret = -ENODEV; | |
| 87 | goto err; | |
| 88 | } else | |
| 89 | dev_info(max77686->dev, "device found\n"); | |
| 90 | ||
| 91 | max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC); | |
| 92 | i2c_set_clientdata(max77686->rtc, max77686); | |
| 93 | ||
| 94 | max77686_irq_init(max77686); | |
| 95 | ||
| 96 | ret = mfd_add_devices(max77686->dev, -1, max77686_devs, | |
| 97 | ARRAY_SIZE(max77686_devs), NULL, 0); | |
| 98 | ||
| 99 | if (ret < 0) | |
| 100 | goto err_mfd; | |
| 101 | ||
| 102 | return ret; | |
| 103 | ||
| 104 | err_mfd: | |
| 105 | mfd_remove_devices(max77686->dev); | |
| 106 | i2c_unregister_device(max77686->rtc); | |
| 107 | err: | |
| 108 | kfree(max77686); | |
| 109 | return ret; | |
| 110 | } | |
| 111 | ||
| 112 | static int max77686_i2c_remove(struct i2c_client *i2c) | |
| 113 | { | |
| 114 | struct max77686_dev *max77686 = i2c_get_clientdata(i2c); | |
| 115 | ||
| 116 | mfd_remove_devices(max77686->dev); | |
| 117 | i2c_unregister_device(max77686->rtc); | |
| 118 | kfree(max77686); | |
| 119 | ||
| 120 | return 0; | |
| 121 | } | |
| 122 | ||
| 123 | static const struct i2c_device_id max77686_i2c_id[] = { | |
| 124 | { "max77686", TYPE_MAX77686 }, | |
| 125 | { } | |
| 126 | }; | |
| 127 | MODULE_DEVICE_TABLE(i2c, max77686_i2c_id); | |
| 128 | ||
| 129 | static struct i2c_driver max77686_i2c_driver = { | |
| 130 | .driver = { | |
| 131 | .name = "max77686", | |
| 132 | .owner = THIS_MODULE, | |
| 133 | }, | |
| 134 | .probe = max77686_i2c_probe, | |
| 135 | .remove = max77686_i2c_remove, | |
| 136 | .id_table = max77686_i2c_id, | |
| 137 | }; | |
| 138 | ||
| 139 | static int __init max77686_i2c_init(void) | |
| 140 | { | |
| 141 | return i2c_add_driver(&max77686_i2c_driver); | |
| 142 | } | |
| 143 | /* init early so consumer devices can complete system boot */ | |
| 144 | subsys_initcall(max77686_i2c_init); | |
| 145 | ||
| 146 | static void __exit max77686_i2c_exit(void) | |
| 147 | { | |
| 148 | i2c_del_driver(&max77686_i2c_driver); | |
| 149 | } | |
| 150 | module_exit(max77686_i2c_exit); | |
| 151 | ||
| 152 | MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver"); | |
| 153 | MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>"); | |
| 154 | MODULE_LICENSE("GPL"); |