projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 84c99db8 AJ |
1 | /* |
| 2 | * I2C access for DA9052 PMICs. | |
| 3 | * | |
| 4 | * Copyright(c) 2011 Dialog Semiconductor Ltd. | |
| 5 | * | |
| 6 | * Author: David Dajun Chen <dchen@diasemi.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 | */ | |
| 14 | ||
| 15 | #include <linux/device.h> | |
| 16 | #include <linux/module.h> | |
| 17 | #include <linux/input.h> | |
| 18 | #include <linux/mfd/core.h> | |
| 19 | #include <linux/i2c.h> | |
| 20 | #include <linux/err.h> | |
| 21 | ||
| 22 | #include <linux/mfd/da9052/da9052.h> | |
| 23 | #include <linux/mfd/da9052/reg.h> | |
| 24 | ||
| 25 | static int da9052_i2c_enable_multiwrite(struct da9052 *da9052) | |
| 26 | { | |
| 27 | int reg_val, ret; | |
| 28 | ||
| 29 | ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, ®_val); | |
| 30 | if (ret < 0) | |
| 31 | return ret; | |
| 32 | ||
| 33 | if (reg_val & DA9052_CONTROL_B_WRITEMODE) { | |
| 34 | reg_val &= ~DA9052_CONTROL_B_WRITEMODE; | |
| 35 | ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG, | |
| 36 | reg_val); | |
| 37 | if (ret < 0) | |
| 38 | return ret; | |
| 39 | } | |
| 40 | ||
| 41 | return 0; | |
| 42 | } | |
| 43 | ||
| 44 | static int __devinit da9052_i2c_probe(struct i2c_client *client, | |
| 45 | const struct i2c_device_id *id) | |
| 46 | { | |
| 47 | struct da9052 *da9052; | |
| 48 | int ret; | |
| 49 | ||
| 50 | da9052 = kzalloc(sizeof(struct da9052), GFP_KERNEL); | |
| 51 | if (!da9052) | |
| 52 | return -ENOMEM; | |
| 53 | ||
| 54 | if (!i2c_check_functionality(client->adapter, | |
| 55 | I2C_FUNC_SMBUS_BYTE_DATA)) { | |
| 56 | dev_info(&client->dev, "Error in %s:i2c_check_functionality\n", | |
| 57 | __func__); | |
| 58 | ret = -ENODEV; | |
| 59 | goto err; | |
| 60 | } | |
| 61 | ||
| 62 | da9052->dev = &client->dev; | |
| 63 | da9052->chip_irq = client->irq; | |
| 64 | ||
| 65 | i2c_set_clientdata(client, da9052); | |
| 66 | ||
| 67 | da9052->regmap = regmap_init_i2c(client, &da9052_regmap_config); | |
| 68 | if (IS_ERR(da9052->regmap)) { | |
| 69 | ret = PTR_ERR(da9052->regmap); | |
| 70 | dev_err(&client->dev, "Failed to allocate register map: %d\n", | |
| 71 | ret); | |
| 72 | goto err; | |
| 73 | } | |
| 74 | ||
| 75 | ret = da9052_i2c_enable_multiwrite(da9052); | |
| 76 | if (ret < 0) | |
| 4d75dd61 | 77 | goto err_regmap; |
| 84c99db8 AJ |
78 | |
| 79 | ret = da9052_device_init(da9052, id->driver_data); | |
| 80 | if (ret != 0) | |
| 4d75dd61 | 81 | goto err_regmap; |
| 84c99db8 AJ |
82 | |
| 83 | return 0; | |
| 84 | ||
| 4d75dd61 AL |
85 | err_regmap: |
| 86 | regmap_exit(da9052->regmap); | |
| 84c99db8 AJ |
87 | err: |
| 88 | kfree(da9052); | |
| 89 | return ret; | |
| 90 | } | |
| 91 | ||
| bcc2d6d6 | 92 | static int __devexit da9052_i2c_remove(struct i2c_client *client) |
| 84c99db8 AJ |
93 | { |
| 94 | struct da9052 *da9052 = i2c_get_clientdata(client); | |
| 95 | ||
| 96 | da9052_device_exit(da9052); | |
| 4d75dd61 | 97 | regmap_exit(da9052->regmap); |
| 84c99db8 AJ |
98 | kfree(da9052); |
| 99 | ||
| 100 | return 0; | |
| 101 | } | |
| 102 | ||
| 103 | static struct i2c_device_id da9052_i2c_id[] = { | |
| 104 | {"da9052", DA9052}, | |
| 105 | {"da9053-aa", DA9053_AA}, | |
| 106 | {"da9053-ba", DA9053_BA}, | |
| 107 | {"da9053-bb", DA9053_BB}, | |
| 108 | {} | |
| 109 | }; | |
| 110 | ||
| 111 | static struct i2c_driver da9052_i2c_driver = { | |
| 112 | .probe = da9052_i2c_probe, | |
| bcc2d6d6 | 113 | .remove = __devexit_p(da9052_i2c_remove), |
| 84c99db8 AJ |
114 | .id_table = da9052_i2c_id, |
| 115 | .driver = { | |
| 116 | .name = "da9052", | |
| 117 | .owner = THIS_MODULE, | |
| 118 | }, | |
| 119 | }; | |
| 120 | ||
| 121 | static int __init da9052_i2c_init(void) | |
| 122 | { | |
| 123 | int ret; | |
| 124 | ||
| 125 | ret = i2c_add_driver(&da9052_i2c_driver); | |
| 126 | if (ret != 0) { | |
| 127 | pr_err("DA9052 I2C registration failed %d\n", ret); | |
| 128 | return ret; | |
| 129 | } | |
| 130 | ||
| 131 | return 0; | |
| 132 | } | |
| 133 | subsys_initcall(da9052_i2c_init); | |
| 134 | ||
| 135 | static void __exit da9052_i2c_exit(void) | |
| 136 | { | |
| 137 | i2c_del_driver(&da9052_i2c_driver); | |
| 138 | } | |
| 139 | module_exit(da9052_i2c_exit); | |
| 140 | ||
| 141 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
| 142 | MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC"); | |
| 143 | MODULE_LICENSE("GPL"); |