1 /* 2 * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies 3 * 4 * Copyright (C) 2012 Renesas Electronics Corporation 5 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the version 2 of the GNU General Public License as 9 * published by the Free Software Foundation 10 */ 11 12 #include <linux/err.h> 13 #include <linux/init.h> 14 #include <linux/mfd/as3711.h> 15 #include <linux/module.h> 16 #include <linux/of.h> 17 #include <linux/platform_device.h> 18 #include <linux/regmap.h> 19 #include <linux/regulator/driver.h> 20 #include <linux/regulator/of_regulator.h> 21 #include <linux/slab.h> 22 23 struct as3711_regulator_info { 24 struct regulator_desc desc; 25 }; 26 27 struct as3711_regulator { 28 struct as3711_regulator_info *reg_info; 29 }; 30 31 /* 32 * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and 33 * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes: 34 * FAST: sdX_fast=1 35 * NORMAL: low_noise=1 36 * IDLE: low_noise=0 37 */ 38 39 static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode) 40 { 41 unsigned int fast_bit = rdev->desc->enable_mask, 42 low_noise_bit = fast_bit << 4; 43 u8 val; 44 45 switch (mode) { 46 case REGULATOR_MODE_FAST: 47 val = fast_bit | low_noise_bit; 48 break; 49 case REGULATOR_MODE_NORMAL: 50 val = low_noise_bit; 51 break; 52 case REGULATOR_MODE_IDLE: 53 val = 0; 54 break; 55 default: 56 return -EINVAL; 57 } 58 59 return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1, 60 low_noise_bit | fast_bit, val); 61 } 62 63 static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev) 64 { 65 unsigned int fast_bit = rdev->desc->enable_mask, 66 low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit; 67 unsigned int val; 68 int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val); 69 70 if (ret < 0) 71 return ret; 72 73 if ((val & mask) == mask) 74 return REGULATOR_MODE_FAST; 75 76 if ((val & mask) == low_noise_bit) 77 return REGULATOR_MODE_NORMAL; 78 79 if (!(val & mask)) 80 return REGULATOR_MODE_IDLE; 81 82 return -EINVAL; 83 } 84 85 static const struct regulator_ops as3711_sd_ops = { 86 .is_enabled = regulator_is_enabled_regmap, 87 .enable = regulator_enable_regmap, 88 .disable = regulator_disable_regmap, 89 .get_voltage_sel = regulator_get_voltage_sel_regmap, 90 .set_voltage_sel = regulator_set_voltage_sel_regmap, 91 .list_voltage = regulator_list_voltage_linear_range, 92 .map_voltage = regulator_map_voltage_linear_range, 93 .get_mode = as3711_get_mode_sd, 94 .set_mode = as3711_set_mode_sd, 95 }; 96 97 static const struct regulator_ops as3711_aldo_ops = { 98 .is_enabled = regulator_is_enabled_regmap, 99 .enable = regulator_enable_regmap, 100 .disable = regulator_disable_regmap, 101 .get_voltage_sel = regulator_get_voltage_sel_regmap, 102 .set_voltage_sel = regulator_set_voltage_sel_regmap, 103 .list_voltage = regulator_list_voltage_linear_range, 104 .map_voltage = regulator_map_voltage_linear_range, 105 }; 106 107 static const struct regulator_ops as3711_dldo_ops = { 108 .is_enabled = regulator_is_enabled_regmap, 109 .enable = regulator_enable_regmap, 110 .disable = regulator_disable_regmap, 111 .get_voltage_sel = regulator_get_voltage_sel_regmap, 112 .set_voltage_sel = regulator_set_voltage_sel_regmap, 113 .list_voltage = regulator_list_voltage_linear_range, 114 .map_voltage = regulator_map_voltage_linear_range, 115 }; 116 117 static const struct regulator_linear_range as3711_sd_ranges[] = { 118 REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500), 119 REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000), 120 REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000), 121 }; 122 123 static const struct regulator_linear_range as3711_aldo_ranges[] = { 124 REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000), 125 REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000), 126 }; 127 128 static const struct regulator_linear_range as3711_dldo_ranges[] = { 129 REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000), 130 REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000), 131 }; 132 133 #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _sfx) \ 134 [AS3711_REGULATOR_ ## _id] = { \ 135 .desc = { \ 136 .name = "as3711-regulator-" # _id, \ 137 .id = AS3711_REGULATOR_ ## _id, \ 138 .n_voltages = (_vmask + 1), \ 139 .ops = &as3711_ ## _sfx ## _ops, \ 140 .type = REGULATOR_VOLTAGE, \ 141 .owner = THIS_MODULE, \ 142 .vsel_reg = AS3711_ ## _id ## _VOLTAGE, \ 143 .vsel_mask = _vmask, \ 144 .enable_reg = AS3711_ ## _en_reg, \ 145 .enable_mask = BIT(_en_bit), \ 146 .linear_ranges = as3711_ ## _sfx ## _ranges, \ 147 .n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \ 148 }, \ 149 } 150 151 static struct as3711_regulator_info as3711_reg_info[] = { 152 AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, sd), 153 AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, sd), 154 AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, sd), 155 AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, sd), 156 AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, aldo), 157 AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, aldo), 158 AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, dldo), 159 AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, dldo), 160 AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, dldo), 161 AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, dldo), 162 AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, dldo), 163 AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, dldo), 164 /* StepUp output voltage depends on supplying regulator */ 165 }; 166 167 #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info) 168 169 static struct of_regulator_match 170 as3711_regulator_matches[AS3711_REGULATOR_NUM] = { 171 [AS3711_REGULATOR_SD_1] = { .name = "sd1" }, 172 [AS3711_REGULATOR_SD_2] = { .name = "sd2" }, 173 [AS3711_REGULATOR_SD_3] = { .name = "sd3" }, 174 [AS3711_REGULATOR_SD_4] = { .name = "sd4" }, 175 [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" }, 176 [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" }, 177 [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" }, 178 [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" }, 179 [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" }, 180 [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" }, 181 [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" }, 182 [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" }, 183 }; 184 185 static int as3711_regulator_parse_dt(struct device *dev, 186 struct device_node **of_node, const int count) 187 { 188 struct as3711_regulator_pdata *pdata = dev_get_platdata(dev); 189 struct device_node *regulators = 190 of_get_child_by_name(dev->parent->of_node, "regulators"); 191 struct of_regulator_match *match; 192 int ret, i; 193 194 if (!regulators) { 195 dev_err(dev, "regulator node not found\n"); 196 return -ENODEV; 197 } 198 199 ret = of_regulator_match(dev->parent, regulators, 200 as3711_regulator_matches, count); 201 of_node_put(regulators); 202 if (ret < 0) { 203 dev_err(dev, "Error parsing regulator init data: %d\n", ret); 204 return ret; 205 } 206 207 for (i = 0, match = as3711_regulator_matches; i < count; i++, match++) 208 if (match->of_node) { 209 pdata->init_data[i] = match->init_data; 210 of_node[i] = match->of_node; 211 } 212 213 return 0; 214 } 215 216 static int as3711_regulator_probe(struct platform_device *pdev) 217 { 218 struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev); 219 struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent); 220 struct regulator_config config = {.dev = &pdev->dev,}; 221 struct as3711_regulator *reg = NULL; 222 struct as3711_regulator *regs; 223 struct device_node *of_node[AS3711_REGULATOR_NUM] = {}; 224 struct regulator_dev *rdev; 225 struct as3711_regulator_info *ri; 226 int ret; 227 int id; 228 229 if (!pdata) { 230 dev_err(&pdev->dev, "No platform data...\n"); 231 return -ENODEV; 232 } 233 234 if (pdev->dev.parent->of_node) { 235 ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM); 236 if (ret < 0) { 237 dev_err(&pdev->dev, "DT parsing failed: %d\n", ret); 238 return ret; 239 } 240 } 241 242 regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM * 243 sizeof(struct as3711_regulator), GFP_KERNEL); 244 if (!regs) 245 return -ENOMEM; 246 247 for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) { 248 reg = ®s[id]; 249 reg->reg_info = ri; 250 251 config.init_data = pdata->init_data[id]; 252 config.driver_data = reg; 253 config.regmap = as3711->regmap; 254 config.of_node = of_node[id]; 255 256 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config); 257 if (IS_ERR(rdev)) { 258 dev_err(&pdev->dev, "Failed to register regulator %s\n", 259 ri->desc.name); 260 return PTR_ERR(rdev); 261 } 262 } 263 platform_set_drvdata(pdev, regs); 264 return 0; 265 } 266 267 static struct platform_driver as3711_regulator_driver = { 268 .driver = { 269 .name = "as3711-regulator", 270 }, 271 .probe = as3711_regulator_probe, 272 }; 273 274 static int __init as3711_regulator_init(void) 275 { 276 return platform_driver_register(&as3711_regulator_driver); 277 } 278 subsys_initcall(as3711_regulator_init); 279 280 static void __exit as3711_regulator_exit(void) 281 { 282 platform_driver_unregister(&as3711_regulator_driver); 283 } 284 module_exit(as3711_regulator_exit); 285 286 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); 287 MODULE_DESCRIPTION("AS3711 regulator driver"); 288 MODULE_ALIAS("platform:as3711-regulator"); 289 MODULE_LICENSE("GPL v2"); 290