projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 156f2528 KP |
1 | /* |
| 2 | * max8698.c - mfd core driver for the Maxim 8998 | |
| 3 | * | |
| 4 | * Copyright (C) 2009-2010 Samsung Electronics | |
| 5 | * Kyungmin Park <kyungmin.park@samsung.com> | |
| 6 | * Marek Szyprowski <m.szyprowski@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 | ||
| 23 | #include <linux/module.h> | |
| 24 | #include <linux/moduleparam.h> | |
| 25 | #include <linux/init.h> | |
| 26 | #include <linux/slab.h> | |
| 27 | #include <linux/i2c.h> | |
| 28 | #include <linux/mutex.h> | |
| 29 | #include <linux/mfd/core.h> | |
| 30 | #include <linux/mfd/max8998.h> | |
| 31 | #include <linux/mfd/max8998-private.h> | |
| 32 | ||
| 33 | static struct mfd_cell max8998_devs[] = { | |
| 34 | { | |
| 35 | .name = "max8998-pmic", | |
| 36 | } | |
| 37 | }; | |
| 38 | ||
| 39 | static int max8998_i2c_device_read(struct max8998_dev *max8998, u8 reg, u8 *dest) | |
| 40 | { | |
| 41 | struct i2c_client *client = max8998->i2c_client; | |
| 42 | int ret; | |
| 43 | ||
| 44 | mutex_lock(&max8998->iolock); | |
| 45 | ret = i2c_smbus_read_byte_data(client, reg); | |
| 46 | mutex_unlock(&max8998->iolock); | |
| 47 | if (ret < 0) | |
| 48 | return ret; | |
| 49 | ||
| 50 | ret &= 0xff; | |
| 51 | *dest = ret; | |
| 52 | return 0; | |
| 53 | } | |
| 54 | ||
| 55 | static int max8998_i2c_device_write(struct max8998_dev *max8998, u8 reg, u8 value) | |
| 56 | { | |
| 57 | struct i2c_client *client = max8998->i2c_client; | |
| 58 | int ret; | |
| 59 | ||
| 60 | mutex_lock(&max8998->iolock); | |
| 61 | ret = i2c_smbus_write_byte_data(client, reg, value); | |
| 62 | mutex_unlock(&max8998->iolock); | |
| 63 | return ret; | |
| 64 | } | |
| 65 | ||
| 66 | static int max8998_i2c_device_update(struct max8998_dev *max8998, u8 reg, | |
| 67 | u8 val, u8 mask) | |
| 68 | { | |
| 69 | struct i2c_client *client = max8998->i2c_client; | |
| 70 | int ret; | |
| 71 | ||
| 72 | mutex_lock(&max8998->iolock); | |
| 73 | ret = i2c_smbus_read_byte_data(client, reg); | |
| 74 | if (ret >= 0) { | |
| 75 | u8 old_val = ret & 0xff; | |
| 76 | u8 new_val = (val & mask) | (old_val & (~mask)); | |
| 77 | ret = i2c_smbus_write_byte_data(client, reg, new_val); | |
| 78 | if (ret >= 0) | |
| 79 | ret = 0; | |
| 80 | } | |
| 81 | mutex_unlock(&max8998->iolock); | |
| 82 | return ret; | |
| 83 | } | |
| 84 | ||
| 85 | static int max8998_i2c_probe(struct i2c_client *i2c, | |
| 86 | const struct i2c_device_id *id) | |
| 87 | { | |
| 88 | struct max8998_dev *max8998; | |
| 89 | int ret = 0; | |
| 90 | ||
| 91 | max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL); | |
| 92 | if (max8998 == NULL) { | |
| 93 | kfree(i2c); | |
| 94 | return -ENOMEM; | |
| 95 | } | |
| 96 | ||
| 97 | i2c_set_clientdata(i2c, max8998); | |
| 98 | max8998->dev = &i2c->dev; | |
| 99 | max8998->i2c_client = i2c; | |
| 100 | max8998->dev_read = max8998_i2c_device_read; | |
| 101 | max8998->dev_write = max8998_i2c_device_write; | |
| 102 | max8998->dev_update = max8998_i2c_device_update; | |
| 103 | mutex_init(&max8998->iolock); | |
| 104 | ||
| 105 | ret = mfd_add_devices(max8998->dev, -1, | |
| 106 | max8998_devs, ARRAY_SIZE(max8998_devs), | |
| 107 | NULL, 0); | |
| 108 | if (ret < 0) | |
| 109 | goto err; | |
| 110 | ||
| 111 | return ret; | |
| 112 | ||
| 113 | err: | |
| 114 | mfd_remove_devices(max8998->dev); | |
| 115 | kfree(max8998); | |
| 116 | return ret; | |
| 117 | } | |
| 118 | ||
| 119 | static int max8998_i2c_remove(struct i2c_client *i2c) | |
| 120 | { | |
| 121 | struct max8998_dev *max8998 = i2c_get_clientdata(i2c); | |
| 122 | ||
| 123 | mfd_remove_devices(max8998->dev); | |
| 124 | kfree(max8998); | |
| 125 | ||
| 126 | return 0; | |
| 127 | } | |
| 128 | ||
| 129 | static const struct i2c_device_id max8998_i2c_id[] = { | |
| 130 | { "max8998", 0 }, | |
| 131 | { } | |
| 132 | }; | |
| 133 | MODULE_DEVICE_TABLE(i2c, max8998_i2c_id); | |
| 134 | ||
| 135 | static struct i2c_driver max8998_i2c_driver = { | |
| 136 | .driver = { | |
| 137 | .name = "max8998", | |
| 138 | .owner = THIS_MODULE, | |
| 139 | }, | |
| 140 | .probe = max8998_i2c_probe, | |
| 141 | .remove = max8998_i2c_remove, | |
| 142 | .id_table = max8998_i2c_id, | |
| 143 | }; | |
| 144 | ||
| 145 | static int __init max8998_i2c_init(void) | |
| 146 | { | |
| 147 | return i2c_add_driver(&max8998_i2c_driver); | |
| 148 | } | |
| 149 | /* init early so consumer devices can complete system boot */ | |
| 150 | subsys_initcall(max8998_i2c_init); | |
| 151 | ||
| 152 | static void __exit max8998_i2c_exit(void) | |
| 153 | { | |
| 154 | i2c_del_driver(&max8998_i2c_driver); | |
| 155 | } | |
| 156 | module_exit(max8998_i2c_exit); | |
| 157 | ||
| 158 | MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver"); | |
| 159 | MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>"); | |
| 160 | MODULE_LICENSE("GPL"); |