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/init.h> 25 #include <linux/interrupt.h> 26 #include <linux/irq.h> 27 #include <linux/slab.h> 28 #include <linux/regulator/driver.h> 29 #include <linux/regulator/machine.h> 30 #include <linux/regulator/of_regulator.h> 31 #include <linux/regmap.h> 32 33 #include "da9210-regulator.h" 34 35 struct da9210 { 36 struct regulator_dev *rdev; 37 struct regmap *regmap; 38 }; 39 40 static const struct regmap_config da9210_regmap_config = { 41 .reg_bits = 8, 42 .val_bits = 8, 43 }; 44 45 static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA, 46 int max_uA); 47 static int da9210_get_current_limit(struct regulator_dev *rdev); 48 49 static struct regulator_ops da9210_buck_ops = { 50 .enable = regulator_enable_regmap, 51 .disable = regulator_disable_regmap, 52 .is_enabled = regulator_is_enabled_regmap, 53 .set_voltage_sel = regulator_set_voltage_sel_regmap, 54 .get_voltage_sel = regulator_get_voltage_sel_regmap, 55 .list_voltage = regulator_list_voltage_linear, 56 .set_current_limit = da9210_set_current_limit, 57 .get_current_limit = da9210_get_current_limit, 58 }; 59 60 /* Default limits measured in millivolts and milliamps */ 61 #define DA9210_MIN_MV 300 62 #define DA9210_MAX_MV 1570 63 #define DA9210_STEP_MV 10 64 65 /* Current limits for buck (uA) indices corresponds with register values */ 66 static const int da9210_buck_limits[] = { 67 1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 68 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000 69 }; 70 71 static const struct regulator_desc da9210_reg = { 72 .name = "DA9210", 73 .id = 0, 74 .ops = &da9210_buck_ops, 75 .type = REGULATOR_VOLTAGE, 76 .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1, 77 .min_uV = (DA9210_MIN_MV * 1000), 78 .uV_step = (DA9210_STEP_MV * 1000), 79 .vsel_reg = DA9210_REG_VBUCK_A, 80 .vsel_mask = DA9210_VBUCK_MASK, 81 .enable_reg = DA9210_REG_BUCK_CONT, 82 .enable_mask = DA9210_BUCK_EN, 83 .owner = THIS_MODULE, 84 }; 85 86 static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA, 87 int max_uA) 88 { 89 struct da9210 *chip = rdev_get_drvdata(rdev); 90 unsigned int sel; 91 int i; 92 93 /* search for closest to maximum */ 94 for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) { 95 if (min_uA <= da9210_buck_limits[i] && 96 max_uA >= da9210_buck_limits[i]) { 97 sel = i; 98 sel = sel << DA9210_BUCK_ILIM_SHIFT; 99 return regmap_update_bits(chip->regmap, 100 DA9210_REG_BUCK_ILIM, 101 DA9210_BUCK_ILIM_MASK, sel); 102 } 103 } 104 105 return -EINVAL; 106 } 107 108 static int da9210_get_current_limit(struct regulator_dev *rdev) 109 { 110 struct da9210 *chip = rdev_get_drvdata(rdev); 111 unsigned int data; 112 unsigned int sel; 113 int ret; 114 115 ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data); 116 if (ret < 0) 117 return ret; 118 119 /* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */ 120 sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT; 121 122 return da9210_buck_limits[sel]; 123 } 124 125 static irqreturn_t da9210_irq_handler(int irq, void *data) 126 { 127 struct da9210 *chip = data; 128 unsigned int val, handled = 0; 129 int error, ret = IRQ_NONE; 130 131 error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val); 132 if (error < 0) 133 goto error_i2c; 134 135 if (val & DA9210_E_OVCURR) { 136 regulator_notifier_call_chain(chip->rdev, 137 REGULATOR_EVENT_OVER_CURRENT, 138 NULL); 139 handled |= DA9210_E_OVCURR; 140 } 141 if (val & DA9210_E_NPWRGOOD) { 142 regulator_notifier_call_chain(chip->rdev, 143 REGULATOR_EVENT_UNDER_VOLTAGE, 144 NULL); 145 handled |= DA9210_E_NPWRGOOD; 146 } 147 if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) { 148 regulator_notifier_call_chain(chip->rdev, 149 REGULATOR_EVENT_OVER_TEMP, NULL); 150 handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT); 151 } 152 if (val & DA9210_E_VMAX) { 153 regulator_notifier_call_chain(chip->rdev, 154 REGULATOR_EVENT_REGULATION_OUT, 155 NULL); 156 handled |= DA9210_E_VMAX; 157 } 158 if (handled) { 159 /* Clear handled events */ 160 error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled); 161 if (error < 0) 162 goto error_i2c; 163 164 ret = IRQ_HANDLED; 165 } 166 167 return ret; 168 169 error_i2c: 170 dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error); 171 return ret; 172 } 173 174 /* 175 * I2C driver interface functions 176 */ 177 static int da9210_i2c_probe(struct i2c_client *i2c, 178 const struct i2c_device_id *id) 179 { 180 struct da9210 *chip; 181 struct device *dev = &i2c->dev; 182 struct da9210_pdata *pdata = dev_get_platdata(dev); 183 struct regulator_dev *rdev = NULL; 184 struct regulator_config config = { }; 185 int error; 186 187 chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL); 188 if (!chip) 189 return -ENOMEM; 190 191 chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config); 192 if (IS_ERR(chip->regmap)) { 193 error = PTR_ERR(chip->regmap); 194 dev_err(&i2c->dev, "Failed to allocate register map: %d\n", 195 error); 196 return error; 197 } 198 199 config.dev = &i2c->dev; 200 config.init_data = pdata ? &pdata->da9210_constraints : 201 of_get_regulator_init_data(dev, dev->of_node, &da9210_reg); 202 config.driver_data = chip; 203 config.regmap = chip->regmap; 204 config.of_node = dev->of_node; 205 206 /* Mask all interrupt sources to deassert interrupt line */ 207 error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0); 208 if (!error) 209 error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0); 210 if (error) { 211 dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error); 212 return error; 213 } 214 215 rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config); 216 if (IS_ERR(rdev)) { 217 dev_err(&i2c->dev, "Failed to register DA9210 regulator\n"); 218 return PTR_ERR(rdev); 219 } 220 221 chip->rdev = rdev; 222 if (i2c->irq) { 223 error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, 224 da9210_irq_handler, 225 IRQF_TRIGGER_LOW | 226 IRQF_ONESHOT | IRQF_SHARED, 227 "da9210", chip); 228 if (error) { 229 dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n", 230 i2c->irq, error); 231 return error; 232 } 233 234 error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B, 235 DA9210_M_OVCURR | DA9210_M_NPWRGOOD | 236 DA9210_M_TEMP_WARN | 237 DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0); 238 if (error < 0) { 239 dev_err(&i2c->dev, "Failed to update mask reg: %d\n", 240 error); 241 return error; 242 } 243 } else { 244 dev_warn(&i2c->dev, "No IRQ configured\n"); 245 } 246 247 i2c_set_clientdata(i2c, chip); 248 249 return 0; 250 } 251 252 static const struct i2c_device_id da9210_i2c_id[] = { 253 {"da9210", 0}, 254 {}, 255 }; 256 257 MODULE_DEVICE_TABLE(i2c, da9210_i2c_id); 258 259 static struct i2c_driver da9210_regulator_driver = { 260 .driver = { 261 .name = "da9210", 262 }, 263 .probe = da9210_i2c_probe, 264 .id_table = da9210_i2c_id, 265 }; 266 267 module_i2c_driver(da9210_regulator_driver); 268 269 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); 270 MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210"); 271 MODULE_LICENSE("GPL v2"); 272