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 regulator_dev *rdev[ACT8865_REG_NUM]; 66 struct regmap *regmap; 67 }; 68 69 static const struct regmap_config act8865_regmap_config = { 70 .reg_bits = 8, 71 .val_bits = 8, 72 }; 73 74 static const struct regulator_linear_range act8865_volatge_ranges[] = { 75 REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000), 76 REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000), 77 REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000), 78 }; 79 80 static struct regulator_ops act8865_ops = { 81 .list_voltage = regulator_list_voltage_linear_range, 82 .map_voltage = regulator_map_voltage_linear_range, 83 .get_voltage_sel = regulator_get_voltage_sel_regmap, 84 .set_voltage_sel = regulator_set_voltage_sel_regmap, 85 .enable = regulator_enable_regmap, 86 .disable = regulator_disable_regmap, 87 .is_enabled = regulator_is_enabled_regmap, 88 }; 89 90 static const struct regulator_desc act8865_reg[] = { 91 { 92 .name = "DCDC_REG1", 93 .id = ACT8865_ID_DCDC1, 94 .ops = &act8865_ops, 95 .type = REGULATOR_VOLTAGE, 96 .n_voltages = ACT8865_VOLTAGE_NUM, 97 .linear_ranges = act8865_volatge_ranges, 98 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), 99 .vsel_reg = ACT8865_DCDC1_VSET1, 100 .vsel_mask = ACT8865_VSEL_MASK, 101 .enable_reg = ACT8865_DCDC1_CTRL, 102 .enable_mask = ACT8865_ENA, 103 .owner = THIS_MODULE, 104 }, 105 { 106 .name = "DCDC_REG2", 107 .id = ACT8865_ID_DCDC2, 108 .ops = &act8865_ops, 109 .type = REGULATOR_VOLTAGE, 110 .n_voltages = ACT8865_VOLTAGE_NUM, 111 .linear_ranges = act8865_volatge_ranges, 112 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), 113 .vsel_reg = ACT8865_DCDC2_VSET1, 114 .vsel_mask = ACT8865_VSEL_MASK, 115 .enable_reg = ACT8865_DCDC2_CTRL, 116 .enable_mask = ACT8865_ENA, 117 .owner = THIS_MODULE, 118 }, 119 { 120 .name = "DCDC_REG3", 121 .id = ACT8865_ID_DCDC3, 122 .ops = &act8865_ops, 123 .type = REGULATOR_VOLTAGE, 124 .n_voltages = ACT8865_VOLTAGE_NUM, 125 .linear_ranges = act8865_volatge_ranges, 126 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), 127 .vsel_reg = ACT8865_DCDC3_VSET1, 128 .vsel_mask = ACT8865_VSEL_MASK, 129 .enable_reg = ACT8865_DCDC3_CTRL, 130 .enable_mask = ACT8865_ENA, 131 .owner = THIS_MODULE, 132 }, 133 { 134 .name = "LDO_REG1", 135 .id = ACT8865_ID_LDO1, 136 .ops = &act8865_ops, 137 .type = REGULATOR_VOLTAGE, 138 .n_voltages = ACT8865_VOLTAGE_NUM, 139 .linear_ranges = act8865_volatge_ranges, 140 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), 141 .vsel_reg = ACT8865_LDO1_VSET, 142 .vsel_mask = ACT8865_VSEL_MASK, 143 .enable_reg = ACT8865_LDO1_CTRL, 144 .enable_mask = ACT8865_ENA, 145 .owner = THIS_MODULE, 146 }, 147 { 148 .name = "LDO_REG2", 149 .id = ACT8865_ID_LDO2, 150 .ops = &act8865_ops, 151 .type = REGULATOR_VOLTAGE, 152 .n_voltages = ACT8865_VOLTAGE_NUM, 153 .linear_ranges = act8865_volatge_ranges, 154 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), 155 .vsel_reg = ACT8865_LDO2_VSET, 156 .vsel_mask = ACT8865_VSEL_MASK, 157 .enable_reg = ACT8865_LDO2_CTRL, 158 .enable_mask = ACT8865_ENA, 159 .owner = THIS_MODULE, 160 }, 161 { 162 .name = "LDO_REG3", 163 .id = ACT8865_ID_LDO3, 164 .ops = &act8865_ops, 165 .type = REGULATOR_VOLTAGE, 166 .n_voltages = ACT8865_VOLTAGE_NUM, 167 .linear_ranges = act8865_volatge_ranges, 168 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), 169 .vsel_reg = ACT8865_LDO3_VSET, 170 .vsel_mask = ACT8865_VSEL_MASK, 171 .enable_reg = ACT8865_LDO3_CTRL, 172 .enable_mask = ACT8865_ENA, 173 .owner = THIS_MODULE, 174 }, 175 { 176 .name = "LDO_REG4", 177 .id = ACT8865_ID_LDO4, 178 .ops = &act8865_ops, 179 .type = REGULATOR_VOLTAGE, 180 .n_voltages = ACT8865_VOLTAGE_NUM, 181 .linear_ranges = act8865_volatge_ranges, 182 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges), 183 .vsel_reg = ACT8865_LDO4_VSET, 184 .vsel_mask = ACT8865_VSEL_MASK, 185 .enable_reg = ACT8865_LDO4_CTRL, 186 .enable_mask = ACT8865_ENA, 187 .owner = THIS_MODULE, 188 }, 189 }; 190 191 #ifdef CONFIG_OF 192 static const struct of_device_id act8865_dt_ids[] = { 193 { .compatible = "active-semi,act8865" }, 194 { } 195 }; 196 MODULE_DEVICE_TABLE(of, act8865_dt_ids); 197 198 static struct of_regulator_match act8865_matches[] = { 199 [ACT8865_ID_DCDC1] = { .name = "DCDC_REG1"}, 200 [ACT8865_ID_DCDC2] = { .name = "DCDC_REG2"}, 201 [ACT8865_ID_DCDC3] = { .name = "DCDC_REG3"}, 202 [ACT8865_ID_LDO1] = { .name = "LDO_REG1"}, 203 [ACT8865_ID_LDO2] = { .name = "LDO_REG2"}, 204 [ACT8865_ID_LDO3] = { .name = "LDO_REG3"}, 205 [ACT8865_ID_LDO4] = { .name = "LDO_REG4"}, 206 }; 207 208 static int act8865_pdata_from_dt(struct device *dev, 209 struct device_node **of_node, 210 struct act8865_platform_data *pdata) 211 { 212 int matched, i; 213 struct device_node *np; 214 struct act8865_regulator_data *regulator; 215 216 np = of_find_node_by_name(dev->of_node, "regulators"); 217 if (!np) { 218 dev_err(dev, "missing 'regulators' subnode in DT\n"); 219 return -EINVAL; 220 } 221 222 matched = of_regulator_match(dev, np, 223 act8865_matches, ARRAY_SIZE(act8865_matches)); 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 dev_err(dev, "%s: failed to allocate act8865 registor\n", 232 __func__); 233 return -ENOMEM; 234 } 235 236 pdata->num_regulators = matched; 237 regulator = pdata->regulators; 238 239 for (i = 0; i < ARRAY_SIZE(act8865_matches); i++) { 240 regulator->id = i; 241 regulator->name = act8865_matches[i].name; 242 regulator->platform_data = act8865_matches[i].init_data; 243 of_node[i] = act8865_matches[i].of_node; 244 regulator++; 245 } 246 247 return 0; 248 } 249 #else 250 static inline int act8865_pdata_from_dt(struct device *dev, 251 struct device_node **of_node, 252 struct act8865_platform_data *pdata) 253 { 254 return 0; 255 } 256 #endif 257 258 static int act8865_pmic_probe(struct i2c_client *client, 259 const struct i2c_device_id *i2c_id) 260 { 261 struct regulator_dev **rdev; 262 struct device *dev = &client->dev; 263 struct act8865_platform_data *pdata = dev_get_platdata(dev); 264 struct regulator_config config = { }; 265 struct act8865 *act8865; 266 struct device_node *of_node[ACT8865_REG_NUM]; 267 int i, id; 268 int ret = -EINVAL; 269 int error; 270 271 if (dev->of_node && !pdata) { 272 const struct of_device_id *id; 273 struct act8865_platform_data pdata_of; 274 275 id = of_match_device(of_match_ptr(act8865_dt_ids), dev); 276 if (!id) 277 return -ENODEV; 278 279 ret = act8865_pdata_from_dt(dev, of_node, &pdata_of); 280 if (ret < 0) 281 return ret; 282 283 pdata = &pdata_of; 284 } 285 286 if (pdata->num_regulators > ACT8865_REG_NUM) { 287 dev_err(dev, "Too many regulators found!\n"); 288 return -EINVAL; 289 } 290 291 act8865 = devm_kzalloc(dev, sizeof(struct act8865), GFP_KERNEL); 292 if (!act8865) 293 return -ENOMEM; 294 295 rdev = act8865->rdev; 296 297 act8865->regmap = devm_regmap_init_i2c(client, &act8865_regmap_config); 298 if (IS_ERR(act8865->regmap)) { 299 error = PTR_ERR(act8865->regmap); 300 dev_err(&client->dev, "Failed to allocate register map: %d\n", 301 error); 302 return error; 303 } 304 305 /* Finally register devices */ 306 for (i = 0; i < ACT8865_REG_NUM; i++) { 307 308 id = pdata->regulators[i].id; 309 310 config.dev = dev; 311 config.init_data = pdata->regulators[i].platform_data; 312 config.of_node = of_node[i]; 313 config.driver_data = act8865; 314 config.regmap = act8865->regmap; 315 316 rdev[i] = devm_regulator_register(&client->dev, 317 &act8865_reg[i], &config); 318 if (IS_ERR(rdev[i])) { 319 dev_err(dev, "failed to register %s\n", 320 act8865_reg[id].name); 321 return PTR_ERR(rdev[i]); 322 } 323 } 324 325 i2c_set_clientdata(client, act8865); 326 327 return 0; 328 } 329 330 static const struct i2c_device_id act8865_ids[] = { 331 { "act8865", 0 }, 332 { }, 333 }; 334 MODULE_DEVICE_TABLE(i2c, act8865_ids); 335 336 static struct i2c_driver act8865_pmic_driver = { 337 .driver = { 338 .name = "act8865", 339 .owner = THIS_MODULE, 340 }, 341 .probe = act8865_pmic_probe, 342 .id_table = act8865_ids, 343 }; 344 345 module_i2c_driver(act8865_pmic_driver); 346 347 MODULE_DESCRIPTION("active-semi act8865 voltage regulator driver"); 348 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>"); 349 MODULE_LICENSE("GPL v2"); 350