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 .id = _id, \ 28 .of_match = of_match_ptr(_of), \ 29 .regulators_node = of_match_ptr("regulators"),\ 30 .ops = &_ops, \ 31 .n_voltages = _n, \ 32 .type = REGULATOR_VOLTAGE, \ 33 .owner = THIS_MODULE, \ 34 .vsel_reg = _vr, \ 35 .vsel_mask = _vm, \ 36 .enable_reg = _er, \ 37 .enable_mask = _em, \ 38 .ramp_delay = _delay, \ 39 .linear_ranges = _lr, \ 40 .n_linear_ranges = ARRAY_SIZE(_lr), \ 41 }, \ 42 .ctrl2_reg = _cr, \ 43 } 44 45 struct lp873x_regulator { 46 struct regulator_desc desc; 47 unsigned int ctrl2_reg; 48 }; 49 50 static const struct lp873x_regulator regulators[]; 51 52 static const struct regulator_linear_range buck0_buck1_ranges[] = { 53 REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0), 54 REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000), 55 REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000), 56 REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000), 57 }; 58 59 static const struct regulator_linear_range ldo0_ldo1_ranges[] = { 60 REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000), 61 }; 62 63 static unsigned int lp873x_buck_ramp_delay[] = { 64 30000, 15000, 10000, 7500, 3800, 1900, 940, 470 65 }; 66 67 /* LP873X BUCK current limit */ 68 static const unsigned int lp873x_buck_uA[] = { 69 1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 70 }; 71 72 static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev, 73 int ramp_delay) 74 { 75 int id = rdev_get_id(rdev); 76 struct lp873x *lp873 = rdev_get_drvdata(rdev); 77 unsigned int reg; 78 int ret; 79 80 if (ramp_delay <= 470) 81 reg = 7; 82 else if (ramp_delay <= 940) 83 reg = 6; 84 else if (ramp_delay <= 1900) 85 reg = 5; 86 else if (ramp_delay <= 3800) 87 reg = 4; 88 else if (ramp_delay <= 7500) 89 reg = 3; 90 else if (ramp_delay <= 10000) 91 reg = 2; 92 else if (ramp_delay <= 15000) 93 reg = 1; 94 else 95 reg = 0; 96 97 ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg, 98 LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE, 99 reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE)); 100 if (ret) { 101 dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret); 102 return ret; 103 } 104 105 rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg]; 106 107 return 0; 108 } 109 110 static int lp873x_buck_set_current_limit(struct regulator_dev *rdev, 111 int min_uA, int max_uA) 112 { 113 int id = rdev_get_id(rdev); 114 struct lp873x *lp873 = rdev_get_drvdata(rdev); 115 int i; 116 117 for (i = ARRAY_SIZE(lp873x_buck_uA) - 1; i >= 0; i--) { 118 if (lp873x_buck_uA[i] >= min_uA && 119 lp873x_buck_uA[i] <= max_uA) 120 return regmap_update_bits(lp873->regmap, 121 regulators[id].ctrl2_reg, 122 LP873X_BUCK0_CTRL_2_BUCK0_ILIM, 123 i << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM)); 124 } 125 126 return -EINVAL; 127 } 128 129 static int lp873x_buck_get_current_limit(struct regulator_dev *rdev) 130 { 131 int id = rdev_get_id(rdev); 132 struct lp873x *lp873 = rdev_get_drvdata(rdev); 133 int ret; 134 unsigned int val; 135 136 ret = regmap_read(lp873->regmap, regulators[id].ctrl2_reg, &val); 137 if (ret) 138 return ret; 139 140 val = (val & LP873X_BUCK0_CTRL_2_BUCK0_ILIM) >> 141 __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM); 142 143 return (val < ARRAY_SIZE(lp873x_buck_uA)) ? 144 lp873x_buck_uA[val] : -EINVAL; 145 } 146 147 /* Operations permitted on BUCK0, BUCK1 */ 148 static struct regulator_ops lp873x_buck01_ops = { 149 .is_enabled = regulator_is_enabled_regmap, 150 .enable = regulator_enable_regmap, 151 .disable = regulator_disable_regmap, 152 .get_voltage_sel = regulator_get_voltage_sel_regmap, 153 .set_voltage_sel = regulator_set_voltage_sel_regmap, 154 .list_voltage = regulator_list_voltage_linear_range, 155 .map_voltage = regulator_map_voltage_linear_range, 156 .set_voltage_time_sel = regulator_set_voltage_time_sel, 157 .set_ramp_delay = lp873x_buck_set_ramp_delay, 158 .set_current_limit = lp873x_buck_set_current_limit, 159 .get_current_limit = lp873x_buck_get_current_limit, 160 }; 161 162 /* Operations permitted on LDO0 and LDO1 */ 163 static struct regulator_ops lp873x_ldo01_ops = { 164 .is_enabled = regulator_is_enabled_regmap, 165 .enable = regulator_enable_regmap, 166 .disable = regulator_disable_regmap, 167 .get_voltage_sel = regulator_get_voltage_sel_regmap, 168 .set_voltage_sel = regulator_set_voltage_sel_regmap, 169 .list_voltage = regulator_list_voltage_linear_range, 170 .map_voltage = regulator_map_voltage_linear_range, 171 }; 172 173 static const struct lp873x_regulator regulators[] = { 174 LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops, 175 256, LP873X_REG_BUCK0_VOUT, 176 LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1, 177 LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000, 178 buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2), 179 LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops, 180 256, LP873X_REG_BUCK1_VOUT, 181 LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1, 182 LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000, 183 buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2), 184 LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26, 185 LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET, 186 LP873X_REG_LDO0_CTRL, 187 LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF), 188 LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26, 189 LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET, 190 LP873X_REG_LDO1_CTRL, 191 LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF), 192 }; 193 194 static int lp873x_regulator_probe(struct platform_device *pdev) 195 { 196 struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent); 197 struct regulator_config config = { }; 198 struct regulator_dev *rdev; 199 int i; 200 201 platform_set_drvdata(pdev, lp873); 202 203 config.dev = &pdev->dev; 204 config.dev->of_node = lp873->dev->of_node; 205 config.driver_data = lp873; 206 config.regmap = lp873->regmap; 207 208 for (i = 0; i < ARRAY_SIZE(regulators); i++) { 209 rdev = devm_regulator_register(&pdev->dev, ®ulators[i].desc, 210 &config); 211 if (IS_ERR(rdev)) { 212 dev_err(lp873->dev, "failed to register %s regulator\n", 213 pdev->name); 214 return PTR_ERR(rdev); 215 } 216 } 217 218 return 0; 219 } 220 221 static const struct platform_device_id lp873x_regulator_id_table[] = { 222 { "lp873x-regulator", }, 223 { /* sentinel */ } 224 }; 225 MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table); 226 227 static struct platform_driver lp873x_regulator_driver = { 228 .driver = { 229 .name = "lp873x-pmic", 230 }, 231 .probe = lp873x_regulator_probe, 232 .id_table = lp873x_regulator_id_table, 233 }; 234 module_platform_driver(lp873x_regulator_driver); 235 236 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); 237 MODULE_DESCRIPTION("LP873X voltage regulator driver"); 238 MODULE_ALIAS("platform:lp873x-pmic"); 239 MODULE_LICENSE("GPL v2"); 240