1 /* 2 * arizona-ldo1.c -- LDO1 supply for Arizona devices 3 * 4 * Copyright 2012 Wolfson Microelectronics PLC. 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/moduleparam.h> 16 #include <linux/init.h> 17 #include <linux/bitops.h> 18 #include <linux/err.h> 19 #include <linux/of.h> 20 #include <linux/of_gpio.h> 21 #include <linux/platform_device.h> 22 #include <linux/regulator/driver.h> 23 #include <linux/regulator/machine.h> 24 #include <linux/regulator/of_regulator.h> 25 #include <linux/gpio.h> 26 #include <linux/slab.h> 27 28 #include <linux/mfd/arizona/core.h> 29 #include <linux/mfd/arizona/pdata.h> 30 #include <linux/mfd/arizona/registers.h> 31 32 struct arizona_ldo1 { 33 struct regulator_dev *regulator; 34 struct arizona *arizona; 35 36 struct regulator_consumer_supply supply; 37 struct regulator_init_data init_data; 38 }; 39 40 static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev, 41 unsigned int selector) 42 { 43 if (selector >= rdev->desc->n_voltages) 44 return -EINVAL; 45 46 if (selector == rdev->desc->n_voltages - 1) 47 return 1800000; 48 else 49 return rdev->desc->min_uV + (rdev->desc->uV_step * selector); 50 } 51 52 static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev, 53 int min_uV, int max_uV) 54 { 55 int sel; 56 57 sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 58 if (sel >= rdev->desc->n_voltages) 59 sel = rdev->desc->n_voltages - 1; 60 61 return sel; 62 } 63 64 static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev, 65 unsigned sel) 66 { 67 struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev); 68 struct regmap *regmap = ldo->arizona->regmap; 69 unsigned int val; 70 int ret; 71 72 if (sel == rdev->desc->n_voltages - 1) 73 val = ARIZONA_LDO1_HI_PWR; 74 else 75 val = 0; 76 77 ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2, 78 ARIZONA_LDO1_HI_PWR, val); 79 if (ret != 0) 80 return ret; 81 82 if (val) 83 return 0; 84 85 val = sel << ARIZONA_LDO1_VSEL_SHIFT; 86 87 return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1, 88 ARIZONA_LDO1_VSEL_MASK, val); 89 } 90 91 static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev) 92 { 93 struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev); 94 struct regmap *regmap = ldo->arizona->regmap; 95 unsigned int val; 96 int ret; 97 98 ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val); 99 if (ret != 0) 100 return ret; 101 102 if (val & ARIZONA_LDO1_HI_PWR) 103 return rdev->desc->n_voltages - 1; 104 105 ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val); 106 if (ret != 0) 107 return ret; 108 109 return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT; 110 } 111 112 static struct regulator_ops arizona_ldo1_hc_ops = { 113 .list_voltage = arizona_ldo1_hc_list_voltage, 114 .map_voltage = arizona_ldo1_hc_map_voltage, 115 .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel, 116 .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel, 117 .get_bypass = regulator_get_bypass_regmap, 118 .set_bypass = regulator_set_bypass_regmap, 119 }; 120 121 static const struct regulator_desc arizona_ldo1_hc = { 122 .name = "LDO1", 123 .supply_name = "LDOVDD", 124 .type = REGULATOR_VOLTAGE, 125 .ops = &arizona_ldo1_hc_ops, 126 127 .bypass_reg = ARIZONA_LDO1_CONTROL_1, 128 .bypass_mask = ARIZONA_LDO1_BYPASS, 129 .min_uV = 900000, 130 .uV_step = 50000, 131 .n_voltages = 8, 132 .enable_time = 1500, 133 134 .owner = THIS_MODULE, 135 }; 136 137 static struct regulator_ops arizona_ldo1_ops = { 138 .list_voltage = regulator_list_voltage_linear, 139 .map_voltage = regulator_map_voltage_linear, 140 .get_voltage_sel = regulator_get_voltage_sel_regmap, 141 .set_voltage_sel = regulator_set_voltage_sel_regmap, 142 }; 143 144 static const struct regulator_desc arizona_ldo1 = { 145 .name = "LDO1", 146 .supply_name = "LDOVDD", 147 .type = REGULATOR_VOLTAGE, 148 .ops = &arizona_ldo1_ops, 149 150 .vsel_reg = ARIZONA_LDO1_CONTROL_1, 151 .vsel_mask = ARIZONA_LDO1_VSEL_MASK, 152 .min_uV = 900000, 153 .uV_step = 25000, 154 .n_voltages = 13, 155 .enable_time = 500, 156 157 .owner = THIS_MODULE, 158 }; 159 160 static const struct regulator_init_data arizona_ldo1_dvfs = { 161 .constraints = { 162 .min_uV = 1200000, 163 .max_uV = 1800000, 164 .valid_ops_mask = REGULATOR_CHANGE_STATUS | 165 REGULATOR_CHANGE_VOLTAGE, 166 }, 167 .num_consumer_supplies = 1, 168 }; 169 170 static const struct regulator_init_data arizona_ldo1_default = { 171 .constraints = { 172 .valid_ops_mask = REGULATOR_CHANGE_STATUS, 173 }, 174 .num_consumer_supplies = 1, 175 }; 176 177 static const struct regulator_init_data arizona_ldo1_wm5110 = { 178 .constraints = { 179 .min_uV = 1175000, 180 .max_uV = 1200000, 181 .valid_ops_mask = REGULATOR_CHANGE_STATUS | 182 REGULATOR_CHANGE_VOLTAGE, 183 }, 184 .num_consumer_supplies = 1, 185 }; 186 187 static int arizona_ldo1_of_get_pdata(struct arizona *arizona, 188 struct regulator_config *config, 189 const struct regulator_desc *desc) 190 { 191 struct arizona_pdata *pdata = &arizona->pdata; 192 struct arizona_ldo1 *ldo1 = config->driver_data; 193 struct device_node *np = arizona->dev->of_node; 194 struct device_node *init_node, *dcvdd_node; 195 struct regulator_init_data *init_data; 196 197 pdata->ldoena = of_get_named_gpio(np, "wlf,ldoena", 0); 198 if (pdata->ldoena < 0) { 199 dev_warn(arizona->dev, 200 "LDOENA GPIO property missing/malformed: %d\n", 201 pdata->ldoena); 202 pdata->ldoena = 0; 203 } else { 204 config->ena_gpio_initialized = true; 205 } 206 207 init_node = of_get_child_by_name(np, "ldo1"); 208 dcvdd_node = of_parse_phandle(np, "DCVDD-supply", 0); 209 210 if (init_node) { 211 config->of_node = init_node; 212 213 init_data = of_get_regulator_init_data(arizona->dev, init_node, 214 desc); 215 216 if (init_data) { 217 init_data->consumer_supplies = &ldo1->supply; 218 init_data->num_consumer_supplies = 1; 219 220 if (dcvdd_node && dcvdd_node != init_node) 221 arizona->external_dcvdd = true; 222 223 pdata->ldo1 = init_data; 224 } 225 } else if (dcvdd_node) { 226 arizona->external_dcvdd = true; 227 } 228 229 of_node_put(dcvdd_node); 230 231 return 0; 232 } 233 234 static int arizona_ldo1_probe(struct platform_device *pdev) 235 { 236 struct arizona *arizona = dev_get_drvdata(pdev->dev.parent); 237 const struct regulator_desc *desc; 238 struct regulator_config config = { }; 239 struct arizona_ldo1 *ldo1; 240 int ret; 241 242 arizona->external_dcvdd = false; 243 244 ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL); 245 if (!ldo1) 246 return -ENOMEM; 247 248 ldo1->arizona = arizona; 249 250 /* 251 * Since the chip usually supplies itself we provide some 252 * default init_data for it. This will be overridden with 253 * platform data if provided. 254 */ 255 switch (arizona->type) { 256 case WM5102: 257 case WM8997: 258 case WM8998: 259 case WM1814: 260 desc = &arizona_ldo1_hc; 261 ldo1->init_data = arizona_ldo1_dvfs; 262 break; 263 case WM5110: 264 case WM8280: 265 desc = &arizona_ldo1; 266 ldo1->init_data = arizona_ldo1_wm5110; 267 break; 268 default: 269 desc = &arizona_ldo1; 270 ldo1->init_data = arizona_ldo1_default; 271 break; 272 } 273 274 ldo1->init_data.consumer_supplies = &ldo1->supply; 275 ldo1->supply.supply = "DCVDD"; 276 ldo1->supply.dev_name = dev_name(arizona->dev); 277 278 config.dev = arizona->dev; 279 config.driver_data = ldo1; 280 config.regmap = arizona->regmap; 281 282 if (IS_ENABLED(CONFIG_OF)) { 283 if (!dev_get_platdata(arizona->dev)) { 284 ret = arizona_ldo1_of_get_pdata(arizona, &config, desc); 285 if (ret < 0) 286 return ret; 287 } 288 } 289 290 config.ena_gpio = arizona->pdata.ldoena; 291 292 if (arizona->pdata.ldo1) 293 config.init_data = arizona->pdata.ldo1; 294 else 295 config.init_data = &ldo1->init_data; 296 297 /* 298 * LDO1 can only be used to supply DCVDD so if it has no 299 * consumers then DCVDD is supplied externally. 300 */ 301 if (config.init_data->num_consumer_supplies == 0) 302 arizona->external_dcvdd = true; 303 304 ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config); 305 306 of_node_put(config.of_node); 307 308 if (IS_ERR(ldo1->regulator)) { 309 ret = PTR_ERR(ldo1->regulator); 310 dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n", 311 ret); 312 return ret; 313 } 314 315 platform_set_drvdata(pdev, ldo1); 316 317 return 0; 318 } 319 320 static struct platform_driver arizona_ldo1_driver = { 321 .probe = arizona_ldo1_probe, 322 .driver = { 323 .name = "arizona-ldo1", 324 }, 325 }; 326 327 module_platform_driver(arizona_ldo1_driver); 328 329 /* Module information */ 330 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 331 MODULE_DESCRIPTION("Arizona LDO1 driver"); 332 MODULE_LICENSE("GPL"); 333 MODULE_ALIAS("platform:arizona-ldo1"); 334