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 /* I2C safe register check */ 31 static inline bool i2c_safe_reg(unsigned char reg) 32 { 33 switch (reg) { 34 case DA9052_STATUS_A_REG: 35 case DA9052_STATUS_B_REG: 36 case DA9052_STATUS_C_REG: 37 case DA9052_STATUS_D_REG: 38 case DA9052_ADC_RES_L_REG: 39 case DA9052_ADC_RES_H_REG: 40 case DA9052_VDD_RES_REG: 41 case DA9052_ICHG_AV_REG: 42 case DA9052_TBAT_RES_REG: 43 case DA9052_ADCIN4_RES_REG: 44 case DA9052_ADCIN5_RES_REG: 45 case DA9052_ADCIN6_RES_REG: 46 case DA9052_TJUNC_RES_REG: 47 case DA9052_TSI_X_MSB_REG: 48 case DA9052_TSI_Y_MSB_REG: 49 case DA9052_TSI_LSB_REG: 50 case DA9052_TSI_Z_MSB_REG: 51 return true; 52 default: 53 return false; 54 } 55 } 56 57 /* 58 * There is an issue with DA9052 and DA9053_AA/BA/BB PMIC where the PMIC 59 * gets lockup up or fails to respond following a system reset. 60 * This fix is to follow any read or write with a dummy read to a safe 61 * register. 62 */ 63 int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg) 64 { 65 int val; 66 67 switch (da9052->chip_id) { 68 case DA9052: 69 case DA9053_AA: 70 case DA9053_BA: 71 case DA9053_BB: 72 /* A dummy read to a safe register address. */ 73 if (!i2c_safe_reg(reg)) 74 return regmap_read(da9052->regmap, 75 DA9052_PARK_REGISTER, 76 &val); 77 break; 78 default: 79 /* 80 * For other chips parking of I2C register 81 * to a safe place is not required. 82 */ 83 break; 84 } 85 86 return 0; 87 } 88 EXPORT_SYMBOL(da9052_i2c_fix); 89 90 static int da9052_i2c_enable_multiwrite(struct da9052 *da9052) 91 { 92 int reg_val, ret; 93 94 ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, ®_val); 95 if (ret < 0) 96 return ret; 97 98 if (reg_val & DA9052_CONTROL_B_WRITEMODE) { 99 reg_val &= ~DA9052_CONTROL_B_WRITEMODE; 100 ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG, 101 reg_val); 102 if (ret < 0) 103 return ret; 104 } 105 106 return 0; 107 } 108 109 static const struct i2c_device_id da9052_i2c_id[] = { 110 {"da9052", DA9052}, 111 {"da9053-aa", DA9053_AA}, 112 {"da9053-ba", DA9053_BA}, 113 {"da9053-bb", DA9053_BB}, 114 {} 115 }; 116 117 #ifdef CONFIG_OF 118 static const struct of_device_id dialog_dt_ids[] = { 119 { .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] }, 120 { .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] }, 121 { .compatible = "dlg,da9053-ab", .data = &da9052_i2c_id[2] }, 122 { .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] }, 123 { /* sentinel */ } 124 }; 125 #endif 126 127 static int da9052_i2c_probe(struct i2c_client *client, 128 const struct i2c_device_id *id) 129 { 130 struct da9052 *da9052; 131 int ret; 132 133 da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL); 134 if (!da9052) 135 return -ENOMEM; 136 137 if (!i2c_check_functionality(client->adapter, 138 I2C_FUNC_SMBUS_BYTE_DATA)) { 139 dev_info(&client->dev, "Error in %s:i2c_check_functionality\n", 140 __func__); 141 return -ENODEV; 142 } 143 144 da9052->dev = &client->dev; 145 da9052->chip_irq = client->irq; 146 da9052->fix_io = da9052_i2c_fix; 147 148 i2c_set_clientdata(client, da9052); 149 150 da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config); 151 if (IS_ERR(da9052->regmap)) { 152 ret = PTR_ERR(da9052->regmap); 153 dev_err(&client->dev, "Failed to allocate register map: %d\n", 154 ret); 155 return ret; 156 } 157 158 ret = da9052_i2c_enable_multiwrite(da9052); 159 if (ret < 0) 160 return ret; 161 162 #ifdef CONFIG_OF 163 if (!id) { 164 struct device_node *np = client->dev.of_node; 165 const struct of_device_id *deviceid; 166 167 deviceid = of_match_node(dialog_dt_ids, np); 168 id = deviceid->data; 169 } 170 #endif 171 172 if (!id) { 173 ret = -ENODEV; 174 dev_err(&client->dev, "id is null.\n"); 175 return ret; 176 } 177 178 ret = da9052_device_init(da9052, id->driver_data); 179 if (ret != 0) 180 return ret; 181 182 return 0; 183 } 184 185 static int da9052_i2c_remove(struct i2c_client *client) 186 { 187 struct da9052 *da9052 = i2c_get_clientdata(client); 188 189 da9052_device_exit(da9052); 190 return 0; 191 } 192 193 static struct i2c_driver da9052_i2c_driver = { 194 .probe = da9052_i2c_probe, 195 .remove = da9052_i2c_remove, 196 .id_table = da9052_i2c_id, 197 .driver = { 198 .name = "da9052", 199 .owner = THIS_MODULE, 200 #ifdef CONFIG_OF 201 .of_match_table = dialog_dt_ids, 202 #endif 203 }, 204 }; 205 206 static int __init da9052_i2c_init(void) 207 { 208 int ret; 209 210 ret = i2c_add_driver(&da9052_i2c_driver); 211 if (ret != 0) { 212 pr_err("DA9052 I2C registration failed %d\n", ret); 213 return ret; 214 } 215 216 return 0; 217 } 218 subsys_initcall(da9052_i2c_init); 219 220 static void __exit da9052_i2c_exit(void) 221 { 222 i2c_del_driver(&da9052_i2c_driver); 223 } 224 module_exit(da9052_i2c_exit); 225 226 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 227 MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC"); 228 MODULE_LICENSE("GPL"); 229