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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 | // SPDX-License-Identifier: GPL-2.0-or-later /* * I2C access for DA9052 PMICs. * * Copyright(c) 2011 Dialog Semiconductor Ltd. * * Author: David Dajun Chen <dchen@diasemi.com> */ #include <linux/device.h> #include <linux/module.h> #include <linux/input.h> #include <linux/mfd/core.h> #include <linux/i2c.h> #include <linux/err.h> #include <linux/mfd/da9052/da9052.h> #include <linux/mfd/da9052/reg.h> #ifdef CONFIG_OF #include <linux/of.h> #include <linux/of_device.h> #endif /* I2C safe register check */ static inline bool i2c_safe_reg(unsigned char reg) { switch (reg) { case DA9052_STATUS_A_REG: case DA9052_STATUS_B_REG: case DA9052_STATUS_C_REG: case DA9052_STATUS_D_REG: case DA9052_ADC_RES_L_REG: case DA9052_ADC_RES_H_REG: case DA9052_VDD_RES_REG: case DA9052_ICHG_AV_REG: case DA9052_TBAT_RES_REG: case DA9052_ADCIN4_RES_REG: case DA9052_ADCIN5_RES_REG: case DA9052_ADCIN6_RES_REG: case DA9052_TJUNC_RES_REG: case DA9052_TSI_X_MSB_REG: case DA9052_TSI_Y_MSB_REG: case DA9052_TSI_LSB_REG: case DA9052_TSI_Z_MSB_REG: return true; default: return false; } } /* * There is an issue with DA9052 and DA9053_AA/BA/BB PMIC where the PMIC * gets lockup up or fails to respond following a system reset. * This fix is to follow any read or write with a dummy read to a safe * register. */ static int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg) { int val; switch (da9052->chip_id) { case DA9052: case DA9053_AA: case DA9053_BA: case DA9053_BB: /* A dummy read to a safe register address. */ if (!i2c_safe_reg(reg)) return regmap_read(da9052->regmap, DA9052_PARK_REGISTER, &val); break; case DA9053_BC: default: /* * For other chips parking of I2C register * to a safe place is not required. */ break; } return 0; } /* * According to errata item 24, multiwrite mode should be avoided * in order to prevent register data corruption after power-down. */ static int da9052_i2c_disable_multiwrite(struct da9052 *da9052) { int reg_val, ret; ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, ®_val); if (ret < 0) return ret; if (!(reg_val & DA9052_CONTROL_B_WRITEMODE)) { reg_val |= DA9052_CONTROL_B_WRITEMODE; ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG, reg_val); if (ret < 0) return ret; } return 0; } static const struct i2c_device_id da9052_i2c_id[] = { {"da9052", DA9052}, {"da9053-aa", DA9053_AA}, {"da9053-ba", DA9053_BA}, {"da9053-bb", DA9053_BB}, {"da9053-bc", DA9053_BC}, {} }; MODULE_DEVICE_TABLE(i2c, da9052_i2c_id); #ifdef CONFIG_OF static const struct of_device_id dialog_dt_ids[] = { { .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] }, { .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] }, { .compatible = "dlg,da9053-ba", .data = &da9052_i2c_id[2] }, { .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] }, { .compatible = "dlg,da9053-bc", .data = &da9052_i2c_id[4] }, { /* sentinel */ } }; #endif static int da9052_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct da9052 *da9052; int ret; da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL); if (!da9052) return -ENOMEM; da9052->dev = &client->dev; da9052->chip_irq = client->irq; da9052->fix_io = da9052_i2c_fix; i2c_set_clientdata(client, da9052); da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config); if (IS_ERR(da9052->regmap)) { ret = PTR_ERR(da9052->regmap); dev_err(&client->dev, "Failed to allocate register map: %d\n", ret); return ret; } ret = da9052_i2c_disable_multiwrite(da9052); if (ret < 0) return ret; #ifdef CONFIG_OF if (!id) id = of_device_get_match_data(&client->dev); #endif if (!id) { ret = -ENODEV; dev_err(&client->dev, "id is null.\n"); return ret; } return da9052_device_init(da9052, id->driver_data); } static int da9052_i2c_remove(struct i2c_client *client) { struct da9052 *da9052 = i2c_get_clientdata(client); da9052_device_exit(da9052); return 0; } static struct i2c_driver da9052_i2c_driver = { .probe = da9052_i2c_probe, .remove = da9052_i2c_remove, .id_table = da9052_i2c_id, .driver = { .name = "da9052", #ifdef CONFIG_OF .of_match_table = dialog_dt_ids, #endif }, }; static int __init da9052_i2c_init(void) { int ret; ret = i2c_add_driver(&da9052_i2c_driver); if (ret != 0) { pr_err("DA9052 I2C registration failed %d\n", ret); return ret; } return 0; } subsys_initcall(da9052_i2c_init); static void __exit da9052_i2c_exit(void) { i2c_del_driver(&da9052_i2c_driver); } module_exit(da9052_i2c_exit); MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC"); MODULE_LICENSE("GPL"); |