1 /* 2 * act8865-regulator.c - Voltage regulation for the active-semi ACT8865 3 * http://www.active-semi.com/sheets/ACT8865_Datasheet.pdf 4 * 5 * Copyright (C) 2013 Atmel Corporation 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <linux/i2c.h> 21 #include <linux/err.h> 22 #include <linux/platform_device.h> 23 #include <linux/regulator/driver.h> 24 #include <linux/regulator/act8865.h> 25 #include <linux/of.h> 26 #include <linux/of_device.h> 27 #include <linux/regulator/of_regulator.h> 28 #include <linux/regmap.h> 29 30 /* 31 * ACT8865 Global Register Map. 32 */ 33 #define ACT8865_SYS_MODE 0x00 34 #define ACT8865_SYS_CTRL 0x01 35 #define ACT8865_DCDC1_VSET1 0x20 36 #define ACT8865_DCDC1_VSET2 0x21 37 #define ACT8865_DCDC1_CTRL 0x22 38 #define ACT8865_DCDC2_VSET1 0x30 39 #define ACT8865_DCDC2_VSET2 0x31 40 #define ACT8865_DCDC2_CTRL 0x32 41 #define ACT8865_DCDC3_VSET1 0x40 42 #define ACT8865_DCDC3_VSET2 0x41 43 #define ACT8865_DCDC3_CTRL 0x42 44 #define ACT8865_LDO1_VSET 0x50 45 #define ACT8865_LDO1_CTRL 0x51 46 #define ACT8865_LDO2_VSET 0x54 47 #define ACT8865_LDO2_CTRL 0x55 48 #define ACT8865_LDO3_VSET 0x60 49 #define ACT8865_LDO3_CTRL 0x61 50 #define ACT8865_LDO4_VSET 0x64 51 #define ACT8865_LDO4_CTRL 0x65 52 53 /* 54 * Field Definitions. 55 */ 56 #define ACT8865_ENA 0x80 /* ON - [7] */ 57 #define ACT8865_VSEL_MASK 0x3F /* VSET - [5:0] */ 58 59 /* 60 * ACT8865 voltage number 61 */ 62 #define ACT8865_VOLTAGE_NUM 64 63 64 struct act8865 { 65 struct regmap *regmap; 66 }; 67 68 static const struct regmap_config act8865_regmap_config = { 69 .reg_bits = 8, 70 .val_bits = 8, 71 }; 72 73 static const struct regulator_linear_range act8865_volatge_ranges[] = { 74 REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000), 75 REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000), 76 REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000), 77 }; 78 79 static struct regulator_ops act8865_ops = { 80 .list_voltage = regulator_list_voltage_linear_range, 81 .map_voltage = regulator_map_voltage_linear_range, 82 .get_voltage_sel = regulator_get_voltage_sel_regmap, 83 .set_voltage_sel = regulator_set_voltage_sel_regmap, 84 .enable = regulator_enable_regmap, 85 .disable = regulator_disable_regmap, 86 .is_enabled = regulator_is_enabled_regmap, 87 }; 88 89 static const struct regulator_desc act8865_reg[] = { 90 { 91 .name = "DCDC_REG1", 92 .id = ACT8865_ID_DCDC1, 93 .ops = &act8865_ops, 94 .type = REGULATOR_VOLTAGE, 95 .n_voltages = ACT8865_VOLTAGE_NUM, 96 .linear_ranges = act8865_volatge_ranges, 97 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), 98 .vsel_reg = ACT8865_DCDC1_VSET1, 99 .vsel_mask = ACT8865_VSEL_MASK, 100 .enable_reg = ACT8865_DCDC1_CTRL, 101 .enable_mask = ACT8865_ENA, 102 .owner = THIS_MODULE, 103 }, 104 { 105 .name = "DCDC_REG2", 106 .id = ACT8865_ID_DCDC2, 107 .ops = &act8865_ops, 108 .type = REGULATOR_VOLTAGE, 109 .n_voltages = ACT8865_VOLTAGE_NUM, 110 .linear_ranges = act8865_volatge_ranges, 111 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), 112 .vsel_reg = ACT8865_DCDC2_VSET1, 113 .vsel_mask = ACT8865_VSEL_MASK, 114 .enable_reg = ACT8865_DCDC2_CTRL, 115 .enable_mask = ACT8865_ENA, 116 .owner = THIS_MODULE, 117 }, 118 { 119 .name = "DCDC_REG3", 120 .id = ACT8865_ID_DCDC3, 121 .ops = &act8865_ops, 122 .type = REGULATOR_VOLTAGE, 123 .n_voltages = ACT8865_VOLTAGE_NUM, 124 .linear_ranges = act8865_volatge_ranges, 125 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), 126 .vsel_reg = ACT8865_DCDC3_VSET1, 127 .vsel_mask = ACT8865_VSEL_MASK, 128 .enable_reg = ACT8865_DCDC3_CTRL, 129 .enable_mask = ACT8865_ENA, 130 .owner = THIS_MODULE, 131 }, 132 { 133 .name = "LDO_REG1", 134 .id = ACT8865_ID_LDO1, 135 .ops = &act8865_ops, 136 .type = REGULATOR_VOLTAGE, 137 .n_voltages = ACT8865_VOLTAGE_NUM, 138 .linear_ranges = act8865_volatge_ranges, 139 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), 140 .vsel_reg = ACT8865_LDO1_VSET, 141 .vsel_mask = ACT8865_VSEL_MASK, 142 .enable_reg = ACT8865_LDO1_CTRL, 143 .enable_mask = ACT8865_ENA, 144 .owner = THIS_MODULE, 145 }, 146 { 147 .name = "LDO_REG2", 148 .id = ACT8865_ID_LDO2, 149 .ops = &act8865_ops, 150 .type = REGULATOR_VOLTAGE, 151 .n_voltages = ACT8865_VOLTAGE_NUM, 152 .linear_ranges = act8865_volatge_ranges, 153 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), 154 .vsel_reg = ACT8865_LDO2_VSET, 155 .vsel_mask = ACT8865_VSEL_MASK, 156 .enable_reg = ACT8865_LDO2_CTRL, 157 .enable_mask = ACT8865_ENA, 158 .owner = THIS_MODULE, 159 }, 160 { 161 .name = "LDO_REG3", 162 .id = ACT8865_ID_LDO3, 163 .ops = &act8865_ops, 164 .type = REGULATOR_VOLTAGE, 165 .n_voltages = ACT8865_VOLTAGE_NUM, 166 .linear_ranges = act8865_volatge_ranges, 167 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), 168 .vsel_reg = ACT8865_LDO3_VSET, 169 .vsel_mask = ACT8865_VSEL_MASK, 170 .enable_reg = ACT8865_LDO3_CTRL, 171 .enable_mask = ACT8865_ENA, 172 .owner = THIS_MODULE, 173 }, 174 { 175 .name = "LDO_REG4", 176 .id = ACT8865_ID_LDO4, 177 .ops = &act8865_ops, 178 .type = REGULATOR_VOLTAGE, 179 .n_voltages = ACT8865_VOLTAGE_NUM, 180 .linear_ranges = act8865_volatge_ranges, 181 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), 182 .vsel_reg = ACT8865_LDO4_VSET, 183 .vsel_mask = ACT8865_VSEL_MASK, 184 .enable_reg = ACT8865_LDO4_CTRL, 185 .enable_mask = ACT8865_ENA, 186 .owner = THIS_MODULE, 187 }, 188 }; 189 190 #ifdef CONFIG_OF 191 static const struct of_device_id act8865_dt_ids[] = { 192 { .compatible = "active-semi,act8865" }, 193 { } 194 }; 195 MODULE_DEVICE_TABLE(of, act8865_dt_ids); 196 197 static struct of_regulator_match act8865_matches[] = { 198 [ACT8865_ID_DCDC1] = { .name = "DCDC_REG1"}, 199 [ACT8865_ID_DCDC2] = { .name = "DCDC_REG2"}, 200 [ACT8865_ID_DCDC3] = { .name = "DCDC_REG3"}, 201 [ACT8865_ID_LDO1] = { .name = "LDO_REG1"}, 202 [ACT8865_ID_LDO2] = { .name = "LDO_REG2"}, 203 [ACT8865_ID_LDO3] = { .name = "LDO_REG3"}, 204 [ACT8865_ID_LDO4] = { .name = "LDO_REG4"}, 205 }; 206 207 static int act8865_pdata_from_dt(struct device *dev, 208 struct device_node **of_node, 209 struct act8865_platform_data *pdata) 210 { 211 int matched, i; 212 struct device_node *np; 213 struct act8865_regulator_data *regulator; 214 215 np = of_get_child_by_name(dev->of_node, "regulators"); 216 if (!np) { 217 dev_err(dev, "missing 'regulators' subnode in DT\n"); 218 return -EINVAL; 219 } 220 221 matched = of_regulator_match(dev, np, 222 act8865_matches, ARRAY_SIZE(act8865_matches)); 223 of_node_put(np); 224 if (matched <= 0) 225 return matched; 226 227 pdata->regulators = devm_kzalloc(dev, 228 sizeof(struct act8865_regulator_data) * 229 ARRAY_SIZE(act8865_matches), GFP_KERNEL); 230 if (!pdata->regulators) 231 return -ENOMEM; 232 233 pdata->num_regulators = matched; 234 regulator = pdata->regulators; 235 236 for (i = 0; i < ARRAY_SIZE(act8865_matches); i++) { 237 regulator->id = i; 238 regulator->name = act8865_matches[i].name; 239 regulator->platform_data = act8865_matches[i].init_data; 240 of_node[i] = act8865_matches[i].of_node; 241 regulator++; 242 } 243 244 return 0; 245 } 246 #else 247 static inline int act8865_pdata_from_dt(struct device *dev, 248 struct device_node **of_node, 249 struct act8865_platform_data *pdata) 250 { 251 return 0; 252 } 253 #endif 254 255 static int act8865_pmic_probe(struct i2c_client *client, 256 const struct i2c_device_id *i2c_id) 257 { 258 struct regulator_dev *rdev; 259 struct device *dev = &client->dev; 260 struct act8865_platform_data *pdata = dev_get_platdata(dev); 261 struct regulator_config config = { }; 262 struct act8865 *act8865; 263 struct device_node *of_node[ACT8865_REG_NUM]; 264 int i, id; 265 int ret = -EINVAL; 266 int error; 267 268 if (dev->of_node && !pdata) { 269 const struct of_device_id *id; 270 struct act8865_platform_data pdata_of; 271 272 id = of_match_device(of_match_ptr(act8865_dt_ids), dev); 273 if (!id) 274 return -ENODEV; 275 276 ret = act8865_pdata_from_dt(dev, of_node, &pdata_of); 277 if (ret < 0) 278 return ret; 279 280 pdata = &pdata_of; 281 } 282 283 if (pdata->num_regulators > ACT8865_REG_NUM) { 284 dev_err(dev, "Too many regulators found!\n"); 285 return -EINVAL; 286 } 287 288 act8865 = devm_kzalloc(dev, sizeof(struct act8865), GFP_KERNEL); 289 if (!act8865) 290 return -ENOMEM; 291 292 act8865->regmap = devm_regmap_init_i2c(client, &act8865_regmap_config); 293 if (IS_ERR(act8865->regmap)) { 294 error = PTR_ERR(act8865->regmap); 295 dev_err(&client->dev, "Failed to allocate register map: %d\n", 296 error); 297 return error; 298 } 299 300 /* Finally register devices */ 301 for (i = 0; i < ACT8865_REG_NUM; i++) { 302 303 id = pdata->regulators[i].id; 304 305 config.dev = dev; 306 config.init_data = pdata->regulators[i].platform_data; 307 config.of_node = of_node[i]; 308 config.driver_data = act8865; 309 config.regmap = act8865->regmap; 310 311 rdev = devm_regulator_register(&client->dev, &act8865_reg[i], 312 &config); 313 if (IS_ERR(rdev)) { 314 dev_err(dev, "failed to register %s\n", 315 act8865_reg[id].name); 316 return PTR_ERR(rdev); 317 } 318 } 319 320 i2c_set_clientdata(client, act8865); 321 322 return 0; 323 } 324 325 static const struct i2c_device_id act8865_ids[] = { 326 { "act8865", 0 }, 327 { }, 328 }; 329 MODULE_DEVICE_TABLE(i2c, act8865_ids); 330 331 static struct i2c_driver act8865_pmic_driver = { 332 .driver = { 333 .name = "act8865", 334 .owner = THIS_MODULE, 335 }, 336 .probe = act8865_pmic_probe, 337 .id_table = act8865_ids, 338 }; 339 340 module_i2c_driver(act8865_pmic_driver); 341 342 MODULE_DESCRIPTION("active-semi act8865 voltage regulator driver"); 343 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>"); 344 MODULE_LICENSE("GPL v2"); 345