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 int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA, 45 int max_uA); 46 static int da9210_get_current_limit(struct regulator_dev *rdev); 47 48 static const struct regulator_ops da9210_buck_ops = { 49 .enable = regulator_enable_regmap, 50 .disable = regulator_disable_regmap, 51 .is_enabled = regulator_is_enabled_regmap, 52 .set_voltage_sel = regulator_set_voltage_sel_regmap, 53 .get_voltage_sel = regulator_get_voltage_sel_regmap, 54 .list_voltage = regulator_list_voltage_linear, 55 .set_current_limit = da9210_set_current_limit, 56 .get_current_limit = da9210_get_current_limit, 57 }; 58 59 /* Default limits measured in millivolts and milliamps */ 60 #define DA9210_MIN_MV 300 61 #define DA9210_MAX_MV 1570 62 #define DA9210_STEP_MV 10 63 64 /* Current limits for buck (uA) indices corresponds with register values */ 65 static const int da9210_buck_limits[] = { 66 1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 67 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000 68 }; 69 70 static const struct regulator_desc da9210_reg = { 71 .name = "DA9210", 72 .id = 0, 73 .ops = &da9210_buck_ops, 74 .type = REGULATOR_VOLTAGE, 75 .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1, 76 .min_uV = (DA9210_MIN_MV * 1000), 77 .uV_step = (DA9210_STEP_MV * 1000), 78 .vsel_reg = DA9210_REG_VBUCK_A, 79 .vsel_mask = DA9210_VBUCK_MASK, 80 .enable_reg = DA9210_REG_BUCK_CONT, 81 .enable_mask = DA9210_BUCK_EN, 82 .owner = THIS_MODULE, 83 }; 84 85 static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA, 86 int max_uA) 87 { 88 struct da9210 *chip = rdev_get_drvdata(rdev); 89 unsigned int sel; 90 int i; 91 92 /* search for closest to maximum */ 93 for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) { 94 if (min_uA <= da9210_buck_limits[i] && 95 max_uA >= da9210_buck_limits[i]) { 96 sel = i; 97 sel = sel << DA9210_BUCK_ILIM_SHIFT; 98 return regmap_update_bits(chip->regmap, 99 DA9210_REG_BUCK_ILIM, 100 DA9210_BUCK_ILIM_MASK, sel); 101 } 102 } 103 104 return -EINVAL; 105 } 106 107 static int da9210_get_current_limit(struct regulator_dev *rdev) 108 { 109 struct da9210 *chip = rdev_get_drvdata(rdev); 110 unsigned int data; 111 unsigned int sel; 112 int ret; 113 114 ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data); 115 if (ret < 0) 116 return ret; 117 118 /* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */ 119 sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT; 120 121 return da9210_buck_limits[sel]; 122 } 123 124 static irqreturn_t da9210_irq_handler(int irq, void *data) 125 { 126 struct da9210 *chip = data; 127 unsigned int val, handled = 0; 128 int error, ret = IRQ_NONE; 129 130 error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val); 131 if (error < 0) 132 goto error_i2c; 133 134 mutex_lock(&chip->rdev->mutex); 135 136 if (val & DA9210_E_OVCURR) { 137 regulator_notifier_call_chain(chip->rdev, 138 REGULATOR_EVENT_OVER_CURRENT, 139 NULL); 140 handled |= DA9210_E_OVCURR; 141 } 142 if (val & DA9210_E_NPWRGOOD) { 143 regulator_notifier_call_chain(chip->rdev, 144 REGULATOR_EVENT_UNDER_VOLTAGE, 145 NULL); 146 handled |= DA9210_E_NPWRGOOD; 147 } 148 if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) { 149 regulator_notifier_call_chain(chip->rdev, 150 REGULATOR_EVENT_OVER_TEMP, NULL); 151 handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT); 152 } 153 if (val & DA9210_E_VMAX) { 154 regulator_notifier_call_chain(chip->rdev, 155 REGULATOR_EVENT_REGULATION_OUT, 156 NULL); 157 handled |= DA9210_E_VMAX; 158 } 159 160 mutex_unlock(&chip->rdev->mutex); 161 162 if (handled) { 163 /* Clear handled events */ 164 error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled); 165 if (error < 0) 166 goto error_i2c; 167 168 ret = IRQ_HANDLED; 169 } 170 171 return ret; 172 173 error_i2c: 174 dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error); 175 return ret; 176 } 177 178 /* 179 * I2C driver interface functions 180 */ 181 182 static const struct of_device_id da9210_dt_ids[] = { 183 { .compatible = "dlg,da9210", }, 184 { } 185 }; 186 MODULE_DEVICE_TABLE(of, da9210_dt_ids); 187 188 static int da9210_i2c_probe(struct i2c_client *i2c, 189 const struct i2c_device_id *id) 190 { 191 struct da9210 *chip; 192 struct device *dev = &i2c->dev; 193 struct da9210_pdata *pdata = dev_get_platdata(dev); 194 struct regulator_dev *rdev = NULL; 195 struct regulator_config config = { }; 196 int error; 197 const struct of_device_id *match; 198 199 if (i2c->dev.of_node && !pdata) { 200 match = of_match_device(of_match_ptr(da9210_dt_ids), 201 &i2c->dev); 202 if (!match) { 203 dev_err(&i2c->dev, "Error: No device match found\n"); 204 return -ENODEV; 205 } 206 } 207 208 chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL); 209 if (!chip) 210 return -ENOMEM; 211 212 chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config); 213 if (IS_ERR(chip->regmap)) { 214 error = PTR_ERR(chip->regmap); 215 dev_err(&i2c->dev, "Failed to allocate register map: %d\n", 216 error); 217 return error; 218 } 219 220 config.dev = &i2c->dev; 221 config.init_data = pdata ? &pdata->da9210_constraints : 222 of_get_regulator_init_data(dev, dev->of_node, &da9210_reg); 223 config.driver_data = chip; 224 config.regmap = chip->regmap; 225 config.of_node = dev->of_node; 226 227 /* Mask all interrupt sources to deassert interrupt line */ 228 error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0); 229 if (!error) 230 error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0); 231 if (error) { 232 dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error); 233 return error; 234 } 235 236 rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config); 237 if (IS_ERR(rdev)) { 238 dev_err(&i2c->dev, "Failed to register DA9210 regulator\n"); 239 return PTR_ERR(rdev); 240 } 241 242 chip->rdev = rdev; 243 if (i2c->irq) { 244 error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, 245 da9210_irq_handler, 246 IRQF_TRIGGER_LOW | 247 IRQF_ONESHOT | IRQF_SHARED, 248 "da9210", chip); 249 if (error) { 250 dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n", 251 i2c->irq, error); 252 return error; 253 } 254 255 error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B, 256 DA9210_M_OVCURR | DA9210_M_NPWRGOOD | 257 DA9210_M_TEMP_WARN | 258 DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0); 259 if (error < 0) { 260 dev_err(&i2c->dev, "Failed to update mask reg: %d\n", 261 error); 262 return error; 263 } 264 } else { 265 dev_warn(&i2c->dev, "No IRQ configured\n"); 266 } 267 268 i2c_set_clientdata(i2c, chip); 269 270 return 0; 271 } 272 273 static const struct i2c_device_id da9210_i2c_id[] = { 274 {"da9210", 0}, 275 {}, 276 }; 277 278 MODULE_DEVICE_TABLE(i2c, da9210_i2c_id); 279 280 static struct i2c_driver da9210_regulator_driver = { 281 .driver = { 282 .name = "da9210", 283 .of_match_table = of_match_ptr(da9210_dt_ids), 284 }, 285 .probe = da9210_i2c_probe, 286 .id_table = da9210_i2c_id, 287 }; 288 289 module_i2c_driver(da9210_regulator_driver); 290 291 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); 292 MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210"); 293 MODULE_LICENSE("GPL v2"); 294