1 /* 2 * Regulator driver for LP873X PMIC 3 * 4 * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/ 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any 11 * kind, whether expressed or implied; without even the implied warranty 12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License version 2 for more details. 14 */ 15 16 #include <linux/module.h> 17 #include <linux/platform_device.h> 18 #include <linux/regmap.h> 19 20 #include <linux/mfd/lp873x.h> 21 22 #define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \ 23 _delay, _lr, _cr) \ 24 [_id] = { \ 25 .desc = { \ 26 .name = _name, \ 27 .supply_name = _of "-in", \ 28 .id = _id, \ 29 .of_match = of_match_ptr(_of), \ 30 .regulators_node = of_match_ptr("regulators"),\ 31 .ops = &_ops, \ 32 .n_voltages = _n, \ 33 .type = REGULATOR_VOLTAGE, \ 34 .owner = THIS_MODULE, \ 35 .vsel_reg = _vr, \ 36 .vsel_mask = _vm, \ 37 .enable_reg = _er, \ 38 .enable_mask = _em, \ 39 .ramp_delay = _delay, \ 40 .linear_ranges = _lr, \ 41 .n_linear_ranges = ARRAY_SIZE(_lr), \ 42 }, \ 43 .ctrl2_reg = _cr, \ 44 } 45 46 struct lp873x_regulator { 47 struct regulator_desc desc; 48 unsigned int ctrl2_reg; 49 }; 50 51 static const struct lp873x_regulator regulators[]; 52 53 static const struct regulator_linear_range buck0_buck1_ranges[] = { 54 REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0), 55 REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000), 56 REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000), 57 REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000), 58 }; 59 60 static const struct regulator_linear_range ldo0_ldo1_ranges[] = { 61 REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000), 62 }; 63 64 static unsigned int lp873x_buck_ramp_delay[] = { 65 30000, 15000, 10000, 7500, 3800, 1900, 940, 470 66 }; 67 68 /* LP873X BUCK current limit */ 69 static const unsigned int lp873x_buck_uA[] = { 70 1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 71 }; 72 73 static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev, 74 int ramp_delay) 75 { 76 int id = rdev_get_id(rdev); 77 struct lp873x *lp873 = rdev_get_drvdata(rdev); 78 unsigned int reg; 79 int ret; 80 81 if (ramp_delay <= 470) 82 reg = 7; 83 else if (ramp_delay <= 940) 84 reg = 6; 85 else if (ramp_delay <= 1900) 86 reg = 5; 87 else if (ramp_delay <= 3800) 88 reg = 4; 89 else if (ramp_delay <= 7500) 90 reg = 3; 91 else if (ramp_delay <= 10000) 92 reg = 2; 93 else if (ramp_delay <= 15000) 94 reg = 1; 95 else 96 reg = 0; 97 98 ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg, 99 LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE, 100 reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE)); 101 if (ret) { 102 dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret); 103 return ret; 104 } 105 106 rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg]; 107 108 return 0; 109 } 110 111 static int lp873x_buck_set_current_limit(struct regulator_dev *rdev, 112 int min_uA, int max_uA) 113 { 114 int id = rdev_get_id(rdev); 115 struct lp873x *lp873 = rdev_get_drvdata(rdev); 116 int i; 117 118 for (i = ARRAY_SIZE(lp873x_buck_uA) - 1; i >= 0; i--) { 119 if (lp873x_buck_uA[i] >= min_uA && 120 lp873x_buck_uA[i] <= max_uA) 121 return regmap_update_bits(lp873->regmap, 122 regulators[id].ctrl2_reg, 123 LP873X_BUCK0_CTRL_2_BUCK0_ILIM, 124 i << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM)); 125 } 126 127 return -EINVAL; 128 } 129 130 static int lp873x_buck_get_current_limit(struct regulator_dev *rdev) 131 { 132 int id = rdev_get_id(rdev); 133 struct lp873x *lp873 = rdev_get_drvdata(rdev); 134 int ret; 135 unsigned int val; 136 137 ret = regmap_read(lp873->regmap, regulators[id].ctrl2_reg, &val); 138 if (ret) 139 return ret; 140 141 val = (val & LP873X_BUCK0_CTRL_2_BUCK0_ILIM) >> 142 __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM); 143 144 return (val < ARRAY_SIZE(lp873x_buck_uA)) ? 145 lp873x_buck_uA[val] : -EINVAL; 146 } 147 148 /* Operations permitted on BUCK0, BUCK1 */ 149 static struct regulator_ops lp873x_buck01_ops = { 150 .is_enabled = regulator_is_enabled_regmap, 151 .enable = regulator_enable_regmap, 152 .disable = regulator_disable_regmap, 153 .get_voltage_sel = regulator_get_voltage_sel_regmap, 154 .set_voltage_sel = regulator_set_voltage_sel_regmap, 155 .list_voltage = regulator_list_voltage_linear_range, 156 .map_voltage = regulator_map_voltage_linear_range, 157 .set_voltage_time_sel = regulator_set_voltage_time_sel, 158 .set_ramp_delay = lp873x_buck_set_ramp_delay, 159 .set_current_limit = lp873x_buck_set_current_limit, 160 .get_current_limit = lp873x_buck_get_current_limit, 161 }; 162 163 /* Operations permitted on LDO0 and LDO1 */ 164 static struct regulator_ops lp873x_ldo01_ops = { 165 .is_enabled = regulator_is_enabled_regmap, 166 .enable = regulator_enable_regmap, 167 .disable = regulator_disable_regmap, 168 .get_voltage_sel = regulator_get_voltage_sel_regmap, 169 .set_voltage_sel = regulator_set_voltage_sel_regmap, 170 .list_voltage = regulator_list_voltage_linear_range, 171 .map_voltage = regulator_map_voltage_linear_range, 172 }; 173 174 static const struct lp873x_regulator regulators[] = { 175 LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops, 176 256, LP873X_REG_BUCK0_VOUT, 177 LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1, 178 LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000, 179 buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2), 180 LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops, 181 256, LP873X_REG_BUCK1_VOUT, 182 LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1, 183 LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000, 184 buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2), 185 LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26, 186 LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET, 187 LP873X_REG_LDO0_CTRL, 188 LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF), 189 LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26, 190 LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET, 191 LP873X_REG_LDO1_CTRL, 192 LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF), 193 }; 194 195 static int lp873x_regulator_probe(struct platform_device *pdev) 196 { 197 struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent); 198 struct regulator_config config = { }; 199 struct regulator_dev *rdev; 200 int i; 201 202 platform_set_drvdata(pdev, lp873); 203 204 config.dev = &pdev->dev; 205 config.dev->of_node = lp873->dev->of_node; 206 config.driver_data = lp873; 207 config.regmap = lp873->regmap; 208 209 for (i = 0; i < ARRAY_SIZE(regulators); i++) { 210 rdev = devm_regulator_register(&pdev->dev, ®ulators[i].desc, 211 &config); 212 if (IS_ERR(rdev)) { 213 dev_err(lp873->dev, "failed to register %s regulator\n", 214 pdev->name); 215 return PTR_ERR(rdev); 216 } 217 } 218 219 return 0; 220 } 221 222 static const struct platform_device_id lp873x_regulator_id_table[] = { 223 { "lp873x-regulator", }, 224 { /* sentinel */ } 225 }; 226 MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table); 227 228 static struct platform_driver lp873x_regulator_driver = { 229 .driver = { 230 .name = "lp873x-pmic", 231 }, 232 .probe = lp873x_regulator_probe, 233 .id_table = lp873x_regulator_id_table, 234 }; 235 module_platform_driver(lp873x_regulator_driver); 236 237 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); 238 MODULE_DESCRIPTION("LP873X voltage regulator driver"); 239 MODULE_ALIAS("platform:lp873x-pmic"); 240 MODULE_LICENSE("GPL v2"); 241