1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // da9210-regulator.c - Regulator device driver for DA9210 4 // Copyright (C) 2013 Dialog Semiconductor Ltd. 5 6 #include <linux/err.h> 7 #include <linux/i2c.h> 8 #include <linux/module.h> 9 #include <linux/interrupt.h> 10 #include <linux/irq.h> 11 #include <linux/regulator/driver.h> 12 #include <linux/regulator/machine.h> 13 #include <linux/of_device.h> 14 #include <linux/regulator/of_regulator.h> 15 #include <linux/regmap.h> 16 17 #include "da9210-regulator.h" 18 19 struct da9210 { 20 struct regulator_dev *rdev; 21 struct regmap *regmap; 22 }; 23 24 static const struct regmap_config da9210_regmap_config = { 25 .reg_bits = 8, 26 .val_bits = 8, 27 }; 28 29 static const struct regulator_ops da9210_buck_ops = { 30 .enable = regulator_enable_regmap, 31 .disable = regulator_disable_regmap, 32 .is_enabled = regulator_is_enabled_regmap, 33 .set_voltage_sel = regulator_set_voltage_sel_regmap, 34 .get_voltage_sel = regulator_get_voltage_sel_regmap, 35 .list_voltage = regulator_list_voltage_linear, 36 .set_current_limit = regulator_set_current_limit_regmap, 37 .get_current_limit = regulator_get_current_limit_regmap, 38 }; 39 40 /* Default limits measured in millivolts and milliamps */ 41 #define DA9210_MIN_MV 300 42 #define DA9210_MAX_MV 1570 43 #define DA9210_STEP_MV 10 44 45 /* Current limits for buck (uA) indices corresponds with register values */ 46 static const unsigned int da9210_buck_limits[] = { 47 1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 48 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000 49 }; 50 51 static const struct regulator_desc da9210_reg = { 52 .name = "DA9210", 53 .id = 0, 54 .ops = &da9210_buck_ops, 55 .type = REGULATOR_VOLTAGE, 56 .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1, 57 .min_uV = (DA9210_MIN_MV * 1000), 58 .uV_step = (DA9210_STEP_MV * 1000), 59 .vsel_reg = DA9210_REG_VBUCK_A, 60 .vsel_mask = DA9210_VBUCK_MASK, 61 .enable_reg = DA9210_REG_BUCK_CONT, 62 .enable_mask = DA9210_BUCK_EN, 63 .owner = THIS_MODULE, 64 .curr_table = da9210_buck_limits, 65 .n_current_limits = ARRAY_SIZE(da9210_buck_limits), 66 .csel_reg = DA9210_REG_BUCK_ILIM, 67 .csel_mask = DA9210_BUCK_ILIM_MASK, 68 }; 69 70 static irqreturn_t da9210_irq_handler(int irq, void *data) 71 { 72 struct da9210 *chip = data; 73 unsigned int val, handled = 0; 74 int error, ret = IRQ_NONE; 75 76 error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val); 77 if (error < 0) 78 goto error_i2c; 79 80 regulator_lock(chip->rdev); 81 82 if (val & DA9210_E_OVCURR) { 83 regulator_notifier_call_chain(chip->rdev, 84 REGULATOR_EVENT_OVER_CURRENT, 85 NULL); 86 handled |= DA9210_E_OVCURR; 87 } 88 if (val & DA9210_E_NPWRGOOD) { 89 regulator_notifier_call_chain(chip->rdev, 90 REGULATOR_EVENT_UNDER_VOLTAGE, 91 NULL); 92 handled |= DA9210_E_NPWRGOOD; 93 } 94 if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) { 95 regulator_notifier_call_chain(chip->rdev, 96 REGULATOR_EVENT_OVER_TEMP, NULL); 97 handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT); 98 } 99 if (val & DA9210_E_VMAX) { 100 regulator_notifier_call_chain(chip->rdev, 101 REGULATOR_EVENT_REGULATION_OUT, 102 NULL); 103 handled |= DA9210_E_VMAX; 104 } 105 106 regulator_unlock(chip->rdev); 107 108 if (handled) { 109 /* Clear handled events */ 110 error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled); 111 if (error < 0) 112 goto error_i2c; 113 114 ret = IRQ_HANDLED; 115 } 116 117 return ret; 118 119 error_i2c: 120 dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error); 121 return ret; 122 } 123 124 /* 125 * I2C driver interface functions 126 */ 127 128 static const struct of_device_id __maybe_unused da9210_dt_ids[] = { 129 { .compatible = "dlg,da9210", }, 130 { } 131 }; 132 MODULE_DEVICE_TABLE(of, da9210_dt_ids); 133 134 static int da9210_i2c_probe(struct i2c_client *i2c) 135 { 136 struct da9210 *chip; 137 struct device *dev = &i2c->dev; 138 struct da9210_pdata *pdata = dev_get_platdata(dev); 139 struct regulator_dev *rdev = NULL; 140 struct regulator_config config = { }; 141 int error; 142 const struct of_device_id *match; 143 144 if (i2c->dev.of_node && !pdata) { 145 match = of_match_device(of_match_ptr(da9210_dt_ids), 146 &i2c->dev); 147 if (!match) { 148 dev_err(&i2c->dev, "Error: No device match found\n"); 149 return -ENODEV; 150 } 151 } 152 153 chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL); 154 if (!chip) 155 return -ENOMEM; 156 157 chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config); 158 if (IS_ERR(chip->regmap)) { 159 error = PTR_ERR(chip->regmap); 160 dev_err(&i2c->dev, "Failed to allocate register map: %d\n", 161 error); 162 return error; 163 } 164 165 config.dev = &i2c->dev; 166 config.init_data = pdata ? &pdata->da9210_constraints : 167 of_get_regulator_init_data(dev, dev->of_node, &da9210_reg); 168 config.driver_data = chip; 169 config.regmap = chip->regmap; 170 config.of_node = dev->of_node; 171 172 /* Mask all interrupt sources to deassert interrupt line */ 173 error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0); 174 if (!error) 175 error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0); 176 if (error) { 177 dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error); 178 return error; 179 } 180 181 rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config); 182 if (IS_ERR(rdev)) { 183 dev_err(&i2c->dev, "Failed to register DA9210 regulator\n"); 184 return PTR_ERR(rdev); 185 } 186 187 chip->rdev = rdev; 188 if (i2c->irq) { 189 error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, 190 da9210_irq_handler, 191 IRQF_TRIGGER_LOW | 192 IRQF_ONESHOT | IRQF_SHARED, 193 "da9210", chip); 194 if (error) { 195 dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n", 196 i2c->irq, error); 197 return error; 198 } 199 200 error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B, 201 DA9210_M_OVCURR | DA9210_M_NPWRGOOD | 202 DA9210_M_TEMP_WARN | 203 DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0); 204 if (error < 0) { 205 dev_err(&i2c->dev, "Failed to update mask reg: %d\n", 206 error); 207 return error; 208 } 209 } else { 210 dev_warn(&i2c->dev, "No IRQ configured\n"); 211 } 212 213 i2c_set_clientdata(i2c, chip); 214 215 return 0; 216 } 217 218 static const struct i2c_device_id da9210_i2c_id[] = { 219 {"da9210", 0}, 220 {}, 221 }; 222 223 MODULE_DEVICE_TABLE(i2c, da9210_i2c_id); 224 225 static struct i2c_driver da9210_regulator_driver = { 226 .driver = { 227 .name = "da9210", 228 .of_match_table = of_match_ptr(da9210_dt_ids), 229 }, 230 .probe_new = da9210_i2c_probe, 231 .id_table = da9210_i2c_id, 232 }; 233 234 module_i2c_driver(da9210_regulator_driver); 235 236 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); 237 MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210"); 238 MODULE_LICENSE("GPL v2"); 239