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 #ifdef CONFIG_OF 26 #include <linux/of.h> 27 #include <linux/of_device.h> 28 #endif 29 30 static int da9052_i2c_enable_multiwrite(struct da9052 *da9052) 31 { 32 int reg_val, ret; 33 34 ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, ®_val); 35 if (ret < 0) 36 return ret; 37 38 if (reg_val & DA9052_CONTROL_B_WRITEMODE) { 39 reg_val &= ~DA9052_CONTROL_B_WRITEMODE; 40 ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG, 41 reg_val); 42 if (ret < 0) 43 return ret; 44 } 45 46 return 0; 47 } 48 49 static struct i2c_device_id da9052_i2c_id[] = { 50 {"da9052", DA9052}, 51 {"da9053-aa", DA9053_AA}, 52 {"da9053-ba", DA9053_BA}, 53 {"da9053-bb", DA9053_BB}, 54 {} 55 }; 56 57 #ifdef CONFIG_OF 58 static const struct of_device_id dialog_dt_ids[] = { 59 { .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] }, 60 { .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] }, 61 { .compatible = "dlg,da9053-ab", .data = &da9052_i2c_id[2] }, 62 { .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] }, 63 { /* sentinel */ } 64 }; 65 #endif 66 67 static int __devinit da9052_i2c_probe(struct i2c_client *client, 68 const struct i2c_device_id *id) 69 { 70 struct da9052 *da9052; 71 int ret; 72 73 da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL); 74 if (!da9052) 75 return -ENOMEM; 76 77 if (!i2c_check_functionality(client->adapter, 78 I2C_FUNC_SMBUS_BYTE_DATA)) { 79 dev_info(&client->dev, "Error in %s:i2c_check_functionality\n", 80 __func__); 81 return -ENODEV; 82 } 83 84 da9052->dev = &client->dev; 85 da9052->chip_irq = client->irq; 86 87 i2c_set_clientdata(client, da9052); 88 89 da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config); 90 if (IS_ERR(da9052->regmap)) { 91 ret = PTR_ERR(da9052->regmap); 92 dev_err(&client->dev, "Failed to allocate register map: %d\n", 93 ret); 94 return ret; 95 } 96 97 ret = da9052_i2c_enable_multiwrite(da9052); 98 if (ret < 0) 99 return ret; 100 101 #ifdef CONFIG_OF 102 if (!id) { 103 struct device_node *np = client->dev.of_node; 104 const struct of_device_id *deviceid; 105 106 deviceid = of_match_node(dialog_dt_ids, np); 107 id = (const struct i2c_device_id *)deviceid->data; 108 } 109 #endif 110 111 if (!id) { 112 ret = -ENODEV; 113 dev_err(&client->dev, "id is null.\n"); 114 return ret; 115 } 116 117 ret = da9052_device_init(da9052, id->driver_data); 118 if (ret != 0) 119 return ret; 120 121 return 0; 122 } 123 124 static int __devexit da9052_i2c_remove(struct i2c_client *client) 125 { 126 struct da9052 *da9052 = i2c_get_clientdata(client); 127 128 da9052_device_exit(da9052); 129 return 0; 130 } 131 132 static struct i2c_driver da9052_i2c_driver = { 133 .probe = da9052_i2c_probe, 134 .remove = __devexit_p(da9052_i2c_remove), 135 .id_table = da9052_i2c_id, 136 .driver = { 137 .name = "da9052", 138 .owner = THIS_MODULE, 139 #ifdef CONFIG_OF 140 .of_match_table = dialog_dt_ids, 141 #endif 142 }, 143 }; 144 145 static int __init da9052_i2c_init(void) 146 { 147 int ret; 148 149 ret = i2c_add_driver(&da9052_i2c_driver); 150 if (ret != 0) { 151 pr_err("DA9052 I2C registration failed %d\n", ret); 152 return ret; 153 } 154 155 return 0; 156 } 157 subsys_initcall(da9052_i2c_init); 158 159 static void __exit da9052_i2c_exit(void) 160 { 161 i2c_del_driver(&da9052_i2c_driver); 162 } 163 module_exit(da9052_i2c_exit); 164 165 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 166 MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC"); 167 MODULE_LICENSE("GPL"); 168