| /* |
| * da9210-regulator.c - Regulator device driver for DA9210 |
| * Copyright (C) 2013 Dialog Semiconductor Ltd. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #include <linux/err.h> |
| #include <linux/i2c.h> |
| #include <linux/module.h> |
| #include <linux/interrupt.h> |
| #include <linux/irq.h> |
| #include <linux/regulator/driver.h> |
| #include <linux/regulator/machine.h> |
| #include <linux/of_device.h> |
| #include <linux/regulator/of_regulator.h> |
| #include <linux/regmap.h> |
| |
| #include "da9210-regulator.h" |
| |
| struct da9210 { |
| struct regulator_dev *rdev; |
| struct regmap *regmap; |
| }; |
| |
| static const struct regmap_config da9210_regmap_config = { |
| .reg_bits = 8, |
| .val_bits = 8, |
| }; |
| |
| static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA, |
| int max_uA); |
| static int da9210_get_current_limit(struct regulator_dev *rdev); |
| |
| static const struct regulator_ops da9210_buck_ops = { |
| .enable = regulator_enable_regmap, |
| .disable = regulator_disable_regmap, |
| .is_enabled = regulator_is_enabled_regmap, |
| .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| .list_voltage = regulator_list_voltage_linear, |
| .set_current_limit = da9210_set_current_limit, |
| .get_current_limit = da9210_get_current_limit, |
| }; |
| |
| /* Default limits measured in millivolts and milliamps */ |
| #define DA9210_MIN_MV 300 |
| #define DA9210_MAX_MV 1570 |
| #define DA9210_STEP_MV 10 |
| |
| /* Current limits for buck (uA) indices corresponds with register values */ |
| static const int da9210_buck_limits[] = { |
| 1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, |
| 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000 |
| }; |
| |
| static const struct regulator_desc da9210_reg = { |
| .name = "DA9210", |
| .id = 0, |
| .ops = &da9210_buck_ops, |
| .type = REGULATOR_VOLTAGE, |
| .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1, |
| .min_uV = (DA9210_MIN_MV * 1000), |
| .uV_step = (DA9210_STEP_MV * 1000), |
| .vsel_reg = DA9210_REG_VBUCK_A, |
| .vsel_mask = DA9210_VBUCK_MASK, |
| .enable_reg = DA9210_REG_BUCK_CONT, |
| .enable_mask = DA9210_BUCK_EN, |
| .owner = THIS_MODULE, |
| }; |
| |
| static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA, |
| int max_uA) |
| { |
| struct da9210 *chip = rdev_get_drvdata(rdev); |
| unsigned int sel; |
| int i; |
| |
| /* search for closest to maximum */ |
| for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) { |
| if (min_uA <= da9210_buck_limits[i] && |
| max_uA >= da9210_buck_limits[i]) { |
| sel = i; |
| sel = sel << DA9210_BUCK_ILIM_SHIFT; |
| return regmap_update_bits(chip->regmap, |
| DA9210_REG_BUCK_ILIM, |
| DA9210_BUCK_ILIM_MASK, sel); |
| } |
| } |
| |
| return -EINVAL; |
| } |
| |
| static int da9210_get_current_limit(struct regulator_dev *rdev) |
| { |
| struct da9210 *chip = rdev_get_drvdata(rdev); |
| unsigned int data; |
| unsigned int sel; |
| int ret; |
| |
| ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data); |
| if (ret < 0) |
| return ret; |
| |
| /* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */ |
| sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT; |
| |
| return da9210_buck_limits[sel]; |
| } |
| |
| static irqreturn_t da9210_irq_handler(int irq, void *data) |
| { |
| struct da9210 *chip = data; |
| unsigned int val, handled = 0; |
| int error, ret = IRQ_NONE; |
| |
| error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val); |
| if (error < 0) |
| goto error_i2c; |
| |
| mutex_lock(&chip->rdev->mutex); |
| |
| if (val & DA9210_E_OVCURR) { |
| regulator_notifier_call_chain(chip->rdev, |
| REGULATOR_EVENT_OVER_CURRENT, |
| NULL); |
| handled |= DA9210_E_OVCURR; |
| } |
| if (val & DA9210_E_NPWRGOOD) { |
| regulator_notifier_call_chain(chip->rdev, |
| REGULATOR_EVENT_UNDER_VOLTAGE, |
| NULL); |
| handled |= DA9210_E_NPWRGOOD; |
| } |
| if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) { |
| regulator_notifier_call_chain(chip->rdev, |
| REGULATOR_EVENT_OVER_TEMP, NULL); |
| handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT); |
| } |
| if (val & DA9210_E_VMAX) { |
| regulator_notifier_call_chain(chip->rdev, |
| REGULATOR_EVENT_REGULATION_OUT, |
| NULL); |
| handled |= DA9210_E_VMAX; |
| } |
| |
| mutex_unlock(&chip->rdev->mutex); |
| |
| if (handled) { |
| /* Clear handled events */ |
| error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled); |
| if (error < 0) |
| goto error_i2c; |
| |
| ret = IRQ_HANDLED; |
| } |
| |
| return ret; |
| |
| error_i2c: |
| dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error); |
| return ret; |
| } |
| |
| /* |
| * I2C driver interface functions |
| */ |
| |
| static const struct of_device_id da9210_dt_ids[] = { |
| { .compatible = "dlg,da9210", }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(of, da9210_dt_ids); |
| |
| static int da9210_i2c_probe(struct i2c_client *i2c, |
| const struct i2c_device_id *id) |
| { |
| struct da9210 *chip; |
| struct device *dev = &i2c->dev; |
| struct da9210_pdata *pdata = dev_get_platdata(dev); |
| struct regulator_dev *rdev = NULL; |
| struct regulator_config config = { }; |
| int error; |
| const struct of_device_id *match; |
| |
| if (i2c->dev.of_node && !pdata) { |
| match = of_match_device(of_match_ptr(da9210_dt_ids), |
| &i2c->dev); |
| if (!match) { |
| dev_err(&i2c->dev, "Error: No device match found\n"); |
| return -ENODEV; |
| } |
| } |
| |
| chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL); |
| if (!chip) |
| return -ENOMEM; |
| |
| chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config); |
| if (IS_ERR(chip->regmap)) { |
| error = PTR_ERR(chip->regmap); |
| dev_err(&i2c->dev, "Failed to allocate register map: %d\n", |
| error); |
| return error; |
| } |
| |
| config.dev = &i2c->dev; |
| config.init_data = pdata ? &pdata->da9210_constraints : |
| of_get_regulator_init_data(dev, dev->of_node, &da9210_reg); |
| config.driver_data = chip; |
| config.regmap = chip->regmap; |
| config.of_node = dev->of_node; |
| |
| /* Mask all interrupt sources to deassert interrupt line */ |
| error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0); |
| if (!error) |
| error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0); |
| if (error) { |
| dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error); |
| return error; |
| } |
| |
| rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config); |
| if (IS_ERR(rdev)) { |
| dev_err(&i2c->dev, "Failed to register DA9210 regulator\n"); |
| return PTR_ERR(rdev); |
| } |
| |
| chip->rdev = rdev; |
| if (i2c->irq) { |
| error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, |
| da9210_irq_handler, |
| IRQF_TRIGGER_LOW | |
| IRQF_ONESHOT | IRQF_SHARED, |
| "da9210", chip); |
| if (error) { |
| dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n", |
| i2c->irq, error); |
| return error; |
| } |
| |
| error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B, |
| DA9210_M_OVCURR | DA9210_M_NPWRGOOD | |
| DA9210_M_TEMP_WARN | |
| DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0); |
| if (error < 0) { |
| dev_err(&i2c->dev, "Failed to update mask reg: %d\n", |
| error); |
| return error; |
| } |
| } else { |
| dev_warn(&i2c->dev, "No IRQ configured\n"); |
| } |
| |
| i2c_set_clientdata(i2c, chip); |
| |
| return 0; |
| } |
| |
| static const struct i2c_device_id da9210_i2c_id[] = { |
| {"da9210", 0}, |
| {}, |
| }; |
| |
| MODULE_DEVICE_TABLE(i2c, da9210_i2c_id); |
| |
| static struct i2c_driver da9210_regulator_driver = { |
| .driver = { |
| .name = "da9210", |
| .of_match_table = of_match_ptr(da9210_dt_ids), |
| }, |
| .probe = da9210_i2c_probe, |
| .id_table = da9210_i2c_id, |
| }; |
| |
| module_i2c_driver(da9210_regulator_driver); |
| |
| MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); |
| MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210"); |
| MODULE_LICENSE("GPL v2"); |