1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Regulators driver for Maxim max8925 4 * 5 * Copyright (C) 2009 Marvell International Ltd. 6 * Haojian Zhuang <haojian.zhuang@marvell.com> 7 */ 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/err.h> 12 #include <linux/i2c.h> 13 #include <linux/platform_device.h> 14 #include <linux/regulator/driver.h> 15 #include <linux/regulator/machine.h> 16 #include <linux/mfd/max8925.h> 17 #include <linux/of.h> 18 #include <linux/regulator/of_regulator.h> 19 20 #define SD1_DVM_VMIN 850000 21 #define SD1_DVM_VMAX 1000000 22 #define SD1_DVM_STEP 50000 23 #define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */ 24 #define SD1_DVM_EN 6 /* SDV1 bit 6 */ 25 26 /* bit definitions in LDO control registers */ 27 #define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */ 28 #define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */ 29 #define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */ 30 #define LDO_I2C_EN 0x1 /* Enable by i2c */ 31 #define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */ 32 #define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */ 33 34 struct max8925_regulator_info { 35 struct regulator_desc desc; 36 struct i2c_client *i2c; 37 38 int vol_reg; 39 int enable_reg; 40 }; 41 42 static int max8925_set_voltage_sel(struct regulator_dev *rdev, 43 unsigned int selector) 44 { 45 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 46 unsigned char mask = rdev->desc->n_voltages - 1; 47 48 return max8925_set_bits(info->i2c, info->vol_reg, mask, selector); 49 } 50 51 static int max8925_get_voltage_sel(struct regulator_dev *rdev) 52 { 53 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 54 unsigned char data, mask; 55 int ret; 56 57 ret = max8925_reg_read(info->i2c, info->vol_reg); 58 if (ret < 0) 59 return ret; 60 mask = rdev->desc->n_voltages - 1; 61 data = ret & mask; 62 63 return data; 64 } 65 66 static int max8925_enable(struct regulator_dev *rdev) 67 { 68 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 69 70 return max8925_set_bits(info->i2c, info->enable_reg, 71 LDO_SEQ_MASK << LDO_SEQ_SHIFT | 72 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, 73 LDO_SEQ_I2C << LDO_SEQ_SHIFT | 74 LDO_I2C_EN << LDO_I2C_EN_SHIFT); 75 } 76 77 static int max8925_disable(struct regulator_dev *rdev) 78 { 79 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 80 81 return max8925_set_bits(info->i2c, info->enable_reg, 82 LDO_SEQ_MASK << LDO_SEQ_SHIFT | 83 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, 84 LDO_SEQ_I2C << LDO_SEQ_SHIFT); 85 } 86 87 static int max8925_is_enabled(struct regulator_dev *rdev) 88 { 89 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 90 int ldo_seq, ret; 91 92 ret = max8925_reg_read(info->i2c, info->enable_reg); 93 if (ret < 0) 94 return ret; 95 ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK; 96 if (ldo_seq != LDO_SEQ_I2C) 97 return 1; 98 else 99 return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT); 100 } 101 102 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) 103 { 104 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 105 unsigned char data, mask; 106 107 if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) 108 return -EINVAL; 109 110 data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP); 111 data <<= SD1_DVM_SHIFT; 112 mask = 3 << SD1_DVM_SHIFT; 113 114 return max8925_set_bits(info->i2c, info->enable_reg, mask, data); 115 } 116 117 static int max8925_set_dvm_enable(struct regulator_dev *rdev) 118 { 119 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 120 121 return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 122 1 << SD1_DVM_EN); 123 } 124 125 static int max8925_set_dvm_disable(struct regulator_dev *rdev) 126 { 127 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 128 129 return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); 130 } 131 132 static const struct regulator_ops max8925_regulator_sdv_ops = { 133 .map_voltage = regulator_map_voltage_linear, 134 .list_voltage = regulator_list_voltage_linear, 135 .set_voltage_sel = max8925_set_voltage_sel, 136 .get_voltage_sel = max8925_get_voltage_sel, 137 .enable = max8925_enable, 138 .disable = max8925_disable, 139 .is_enabled = max8925_is_enabled, 140 .set_suspend_voltage = max8925_set_dvm_voltage, 141 .set_suspend_enable = max8925_set_dvm_enable, 142 .set_suspend_disable = max8925_set_dvm_disable, 143 }; 144 145 static const struct regulator_ops max8925_regulator_ldo_ops = { 146 .map_voltage = regulator_map_voltage_linear, 147 .list_voltage = regulator_list_voltage_linear, 148 .set_voltage_sel = max8925_set_voltage_sel, 149 .get_voltage_sel = max8925_get_voltage_sel, 150 .enable = max8925_enable, 151 .disable = max8925_disable, 152 .is_enabled = max8925_is_enabled, 153 }; 154 155 #define MAX8925_SDV(_id, min, max, step) \ 156 { \ 157 .desc = { \ 158 .name = "SDV" #_id, \ 159 .of_match = of_match_ptr("SDV" #_id), \ 160 .regulators_node = of_match_ptr("regulators"), \ 161 .ops = &max8925_regulator_sdv_ops, \ 162 .type = REGULATOR_VOLTAGE, \ 163 .id = MAX8925_ID_SD##_id, \ 164 .owner = THIS_MODULE, \ 165 .n_voltages = 64, \ 166 .min_uV = min * 1000, \ 167 .uV_step = step * 1000, \ 168 }, \ 169 .vol_reg = MAX8925_SDV##_id, \ 170 .enable_reg = MAX8925_SDCTL##_id, \ 171 } 172 173 #define MAX8925_LDO(_id, min, max, step) \ 174 { \ 175 .desc = { \ 176 .name = "LDO" #_id, \ 177 .of_match = of_match_ptr("LDO" #_id), \ 178 .regulators_node = of_match_ptr("regulators"), \ 179 .ops = &max8925_regulator_ldo_ops, \ 180 .type = REGULATOR_VOLTAGE, \ 181 .id = MAX8925_ID_LDO##_id, \ 182 .owner = THIS_MODULE, \ 183 .n_voltages = 64, \ 184 .min_uV = min * 1000, \ 185 .uV_step = step * 1000, \ 186 }, \ 187 .vol_reg = MAX8925_LDOVOUT##_id, \ 188 .enable_reg = MAX8925_LDOCTL##_id, \ 189 } 190 191 static struct max8925_regulator_info max8925_regulator_info[] = { 192 MAX8925_SDV(1, 637.5, 1425, 12.5), 193 MAX8925_SDV(2, 650, 2225, 25), 194 MAX8925_SDV(3, 750, 3900, 50), 195 196 MAX8925_LDO(1, 750, 3900, 50), 197 MAX8925_LDO(2, 650, 2250, 25), 198 MAX8925_LDO(3, 650, 2250, 25), 199 MAX8925_LDO(4, 750, 3900, 50), 200 MAX8925_LDO(5, 750, 3900, 50), 201 MAX8925_LDO(6, 750, 3900, 50), 202 MAX8925_LDO(7, 750, 3900, 50), 203 MAX8925_LDO(8, 750, 3900, 50), 204 MAX8925_LDO(9, 750, 3900, 50), 205 MAX8925_LDO(10, 750, 3900, 50), 206 MAX8925_LDO(11, 750, 3900, 50), 207 MAX8925_LDO(12, 750, 3900, 50), 208 MAX8925_LDO(13, 750, 3900, 50), 209 MAX8925_LDO(14, 750, 3900, 50), 210 MAX8925_LDO(15, 750, 3900, 50), 211 MAX8925_LDO(16, 750, 3900, 50), 212 MAX8925_LDO(17, 650, 2250, 25), 213 MAX8925_LDO(18, 650, 2250, 25), 214 MAX8925_LDO(19, 750, 3900, 50), 215 MAX8925_LDO(20, 750, 3900, 50), 216 }; 217 218 static int max8925_regulator_probe(struct platform_device *pdev) 219 { 220 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 221 struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev); 222 struct regulator_config config = { }; 223 struct max8925_regulator_info *ri; 224 struct resource *res; 225 struct regulator_dev *rdev; 226 int i; 227 228 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 229 if (!res) { 230 dev_err(&pdev->dev, "No REG resource!\n"); 231 return -EINVAL; 232 } 233 for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { 234 ri = &max8925_regulator_info[i]; 235 if (ri->vol_reg == res->start) 236 break; 237 } 238 239 if (i == ARRAY_SIZE(max8925_regulator_info)) { 240 dev_err(&pdev->dev, "Failed to find regulator %llu\n", 241 (unsigned long long)res->start); 242 return -EINVAL; 243 } 244 ri->i2c = chip->i2c; 245 246 config.dev = chip->dev; 247 config.driver_data = ri; 248 249 if (pdata) 250 config.init_data = pdata; 251 252 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config); 253 if (IS_ERR(rdev)) { 254 dev_err(&pdev->dev, "failed to register regulator %s\n", 255 ri->desc.name); 256 return PTR_ERR(rdev); 257 } 258 259 platform_set_drvdata(pdev, rdev); 260 return 0; 261 } 262 263 static struct platform_driver max8925_regulator_driver = { 264 .driver = { 265 .name = "max8925-regulator", 266 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 267 }, 268 .probe = max8925_regulator_probe, 269 }; 270 271 static int __init max8925_regulator_init(void) 272 { 273 return platform_driver_register(&max8925_regulator_driver); 274 } 275 subsys_initcall(max8925_regulator_init); 276 277 static void __exit max8925_regulator_exit(void) 278 { 279 platform_driver_unregister(&max8925_regulator_driver); 280 } 281 module_exit(max8925_regulator_exit); 282 283 MODULE_LICENSE("GPL"); 284 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 285 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); 286 MODULE_ALIAS("platform:max8925-regulator"); 287