1 /* 2 * da9210-regulator.c - Regulator device driver for DA9210 3 * Copyright (C) 2013 Dialog Semiconductor Ltd. 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Library General Public 7 * License as published by the Free Software Foundation; either 8 * version 2 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Library General Public License for more details. 14 * 15 * You should have received a copy of the GNU Library General Public 16 * License along with this library; if not, write to the 17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, 18 * Boston, MA 02110-1301, USA. 19 */ 20 21 #include <linux/err.h> 22 #include <linux/i2c.h> 23 #include <linux/module.h> 24 #include <linux/interrupt.h> 25 #include <linux/irq.h> 26 #include <linux/regulator/driver.h> 27 #include <linux/regulator/machine.h> 28 #include <linux/of_device.h> 29 #include <linux/regulator/of_regulator.h> 30 #include <linux/regmap.h> 31 32 #include "da9210-regulator.h" 33 34 struct da9210 { 35 struct regulator_dev *rdev; 36 struct regmap *regmap; 37 }; 38 39 static const struct regmap_config da9210_regmap_config = { 40 .reg_bits = 8, 41 .val_bits = 8, 42 }; 43 44 static const struct regulator_ops da9210_buck_ops = { 45 .enable = regulator_enable_regmap, 46 .disable = regulator_disable_regmap, 47 .is_enabled = regulator_is_enabled_regmap, 48 .set_voltage_sel = regulator_set_voltage_sel_regmap, 49 .get_voltage_sel = regulator_get_voltage_sel_regmap, 50 .list_voltage = regulator_list_voltage_linear, 51 .set_current_limit = regulator_set_current_limit_regmap, 52 .get_current_limit = regulator_get_current_limit_regmap, 53 }; 54 55 /* Default limits measured in millivolts and milliamps */ 56 #define DA9210_MIN_MV 300 57 #define DA9210_MAX_MV 1570 58 #define DA9210_STEP_MV 10 59 60 /* Current limits for buck (uA) indices corresponds with register values */ 61 static const unsigned int da9210_buck_limits[] = { 62 1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 63 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000 64 }; 65 66 static const struct regulator_desc da9210_reg = { 67 .name = "DA9210", 68 .id = 0, 69 .ops = &da9210_buck_ops, 70 .type = REGULATOR_VOLTAGE, 71 .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1, 72 .min_uV = (DA9210_MIN_MV * 1000), 73 .uV_step = (DA9210_STEP_MV * 1000), 74 .vsel_reg = DA9210_REG_VBUCK_A, 75 .vsel_mask = DA9210_VBUCK_MASK, 76 .enable_reg = DA9210_REG_BUCK_CONT, 77 .enable_mask = DA9210_BUCK_EN, 78 .owner = THIS_MODULE, 79 .curr_table = da9210_buck_limits, 80 .n_current_limits = ARRAY_SIZE(da9210_buck_limits), 81 .csel_reg = DA9210_REG_BUCK_ILIM, 82 .csel_mask = DA9210_BUCK_ILIM_MASK, 83 }; 84 85 static irqreturn_t da9210_irq_handler(int irq, void *data) 86 { 87 struct da9210 *chip = data; 88 unsigned int val, handled = 0; 89 int error, ret = IRQ_NONE; 90 91 error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val); 92 if (error < 0) 93 goto error_i2c; 94 95 regulator_lock(chip->rdev); 96 97 if (val & DA9210_E_OVCURR) { 98 regulator_notifier_call_chain(chip->rdev, 99 REGULATOR_EVENT_OVER_CURRENT, 100 NULL); 101 handled |= DA9210_E_OVCURR; 102 } 103 if (val & DA9210_E_NPWRGOOD) { 104 regulator_notifier_call_chain(chip->rdev, 105 REGULATOR_EVENT_UNDER_VOLTAGE, 106 NULL); 107 handled |= DA9210_E_NPWRGOOD; 108 } 109 if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) { 110 regulator_notifier_call_chain(chip->rdev, 111 REGULATOR_EVENT_OVER_TEMP, NULL); 112 handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT); 113 } 114 if (val & DA9210_E_VMAX) { 115 regulator_notifier_call_chain(chip->rdev, 116 REGULATOR_EVENT_REGULATION_OUT, 117 NULL); 118 handled |= DA9210_E_VMAX; 119 } 120 121 regulator_unlock(chip->rdev); 122 123 if (handled) { 124 /* Clear handled events */ 125 error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled); 126 if (error < 0) 127 goto error_i2c; 128 129 ret = IRQ_HANDLED; 130 } 131 132 return ret; 133 134 error_i2c: 135 dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error); 136 return ret; 137 } 138 139 /* 140 * I2C driver interface functions 141 */ 142 143 static const struct of_device_id da9210_dt_ids[] = { 144 { .compatible = "dlg,da9210", }, 145 { } 146 }; 147 MODULE_DEVICE_TABLE(of, da9210_dt_ids); 148 149 static int da9210_i2c_probe(struct i2c_client *i2c, 150 const struct i2c_device_id *id) 151 { 152 struct da9210 *chip; 153 struct device *dev = &i2c->dev; 154 struct da9210_pdata *pdata = dev_get_platdata(dev); 155 struct regulator_dev *rdev = NULL; 156 struct regulator_config config = { }; 157 int error; 158 const struct of_device_id *match; 159 160 if (i2c->dev.of_node && !pdata) { 161 match = of_match_device(of_match_ptr(da9210_dt_ids), 162 &i2c->dev); 163 if (!match) { 164 dev_err(&i2c->dev, "Error: No device match found\n"); 165 return -ENODEV; 166 } 167 } 168 169 chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL); 170 if (!chip) 171 return -ENOMEM; 172 173 chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config); 174 if (IS_ERR(chip->regmap)) { 175 error = PTR_ERR(chip->regmap); 176 dev_err(&i2c->dev, "Failed to allocate register map: %d\n", 177 error); 178 return error; 179 } 180 181 config.dev = &i2c->dev; 182 config.init_data = pdata ? &pdata->da9210_constraints : 183 of_get_regulator_init_data(dev, dev->of_node, &da9210_reg); 184 config.driver_data = chip; 185 config.regmap = chip->regmap; 186 config.of_node = dev->of_node; 187 188 /* Mask all interrupt sources to deassert interrupt line */ 189 error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0); 190 if (!error) 191 error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0); 192 if (error) { 193 dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error); 194 return error; 195 } 196 197 rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config); 198 if (IS_ERR(rdev)) { 199 dev_err(&i2c->dev, "Failed to register DA9210 regulator\n"); 200 return PTR_ERR(rdev); 201 } 202 203 chip->rdev = rdev; 204 if (i2c->irq) { 205 error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, 206 da9210_irq_handler, 207 IRQF_TRIGGER_LOW | 208 IRQF_ONESHOT | IRQF_SHARED, 209 "da9210", chip); 210 if (error) { 211 dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n", 212 i2c->irq, error); 213 return error; 214 } 215 216 error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B, 217 DA9210_M_OVCURR | DA9210_M_NPWRGOOD | 218 DA9210_M_TEMP_WARN | 219 DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0); 220 if (error < 0) { 221 dev_err(&i2c->dev, "Failed to update mask reg: %d\n", 222 error); 223 return error; 224 } 225 } else { 226 dev_warn(&i2c->dev, "No IRQ configured\n"); 227 } 228 229 i2c_set_clientdata(i2c, chip); 230 231 return 0; 232 } 233 234 static const struct i2c_device_id da9210_i2c_id[] = { 235 {"da9210", 0}, 236 {}, 237 }; 238 239 MODULE_DEVICE_TABLE(i2c, da9210_i2c_id); 240 241 static struct i2c_driver da9210_regulator_driver = { 242 .driver = { 243 .name = "da9210", 244 .of_match_table = of_match_ptr(da9210_dt_ids), 245 }, 246 .probe = da9210_i2c_probe, 247 .id_table = da9210_i2c_id, 248 }; 249 250 module_i2c_driver(da9210_regulator_driver); 251 252 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); 253 MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210"); 254 MODULE_LICENSE("GPL v2"); 255