diff options
Diffstat (limited to 'drivers/regulator/da9211-regulator.c')
| -rw-r--r-- | drivers/regulator/da9211-regulator.c | 368 |
1 files changed, 368 insertions, 0 deletions
diff --git a/drivers/regulator/da9211-regulator.c b/drivers/regulator/da9211-regulator.c new file mode 100644 index 000000000000..1482adafa1ad --- /dev/null +++ b/drivers/regulator/da9211-regulator.c @@ -0,0 +1,368 @@ +/* + * da9211-regulator.c - Regulator device driver for DA9211 + * Copyright (C) 2014 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. + */ + +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/regmap.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/regulator/da9211.h> +#include "da9211-regulator.h" + +#define DA9211_BUCK_MODE_SLEEP 1 +#define DA9211_BUCK_MODE_SYNC 2 +#define DA9211_BUCK_MODE_AUTO 3 + +/* DA9211 REGULATOR IDs */ +#define DA9211_ID_BUCKA 0 +#define DA9211_ID_BUCKB 1 + +struct da9211 { + struct device *dev; + struct regmap *regmap; + struct da9211_pdata *pdata; + struct regulator_dev *rdev[DA9211_MAX_REGULATORS]; + int num_regulator; + int chip_irq; +}; + +static const struct regmap_range_cfg da9211_regmap_range[] = { + { + .selector_reg = DA9211_REG_PAGE_CON, + .selector_mask = DA9211_REG_PAGE_MASK, + .selector_shift = DA9211_REG_PAGE_SHIFT, + .window_start = 0, + .window_len = 256, + .range_min = 0, + .range_max = 2*256, + }, +}; + +static const struct regmap_config da9211_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 2 * 256, + .ranges = da9211_regmap_range, + .num_ranges = ARRAY_SIZE(da9211_regmap_range), +}; + +/* Default limits measured in millivolts and milliamps */ +#define DA9211_MIN_MV 300 +#define DA9211_MAX_MV 1570 +#define DA9211_STEP_MV 10 + +/* Current limits for buck (uA) indices corresponds with register values */ +static const int da9211_current_limits[] = { + 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000, + 3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000 +}; + +static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev) +{ + int id = rdev_get_id(rdev); + struct da9211 *chip = rdev_get_drvdata(rdev); + unsigned int data; + int ret, mode = 0; + + ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data); + if (ret < 0) + return ret; + + switch (data & 0x03) { + case DA9211_BUCK_MODE_SYNC: + mode = REGULATOR_MODE_FAST; + break; + case DA9211_BUCK_MODE_AUTO: + mode = REGULATOR_MODE_NORMAL; + break; + case DA9211_BUCK_MODE_SLEEP: + mode = REGULATOR_MODE_STANDBY; + break; + } + + return mode; +} + +static int da9211_buck_set_mode(struct regulator_dev *rdev, + unsigned int mode) +{ + int id = rdev_get_id(rdev); + struct da9211 *chip = rdev_get_drvdata(rdev); + int val = 0; + + switch (mode) { + case REGULATOR_MODE_FAST: + val = DA9211_BUCK_MODE_SYNC; + break; + case REGULATOR_MODE_NORMAL: + val = DA9211_BUCK_MODE_AUTO; + break; + case REGULATOR_MODE_STANDBY: + val = DA9211_BUCK_MODE_SLEEP; + break; + } + + return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id, + 0x03, val); +} + +static int da9211_set_current_limit(struct regulator_dev *rdev, int min, + int max) +{ + int id = rdev_get_id(rdev); + struct da9211 *chip = rdev_get_drvdata(rdev); + int i; + + /* search for closest to maximum */ + for (i = ARRAY_SIZE(da9211_current_limits)-1; i >= 0; i--) { + if (min <= da9211_current_limits[i] && + max >= da9211_current_limits[i]) { + return regmap_update_bits(chip->regmap, + DA9211_REG_BUCK_ILIM, + (0x0F << id*4), (i << id*4)); + } + } + + return -EINVAL; +} + +static int da9211_get_current_limit(struct regulator_dev *rdev) +{ + int id = rdev_get_id(rdev); + struct da9211 *chip = rdev_get_drvdata(rdev); + unsigned int data; + int ret; + + ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data); + if (ret < 0) + return ret; + + /* select one of 16 values: 0000 (2000mA) to 1111 (5000mA) */ + data = (data >> id*4) & 0x0F; + return da9211_current_limits[data]; +} + +static struct regulator_ops da9211_buck_ops = { + .get_mode = da9211_buck_get_mode, + .set_mode = da9211_buck_set_mode, + .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 = da9211_set_current_limit, + .get_current_limit = da9211_get_current_limit, +}; + +#define DA9211_BUCK(_id) \ +{\ + .name = #_id,\ + .ops = &da9211_buck_ops,\ + .type = REGULATOR_VOLTAGE,\ + .id = DA9211_ID_##_id,\ + .n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\ + .min_uV = (DA9211_MIN_MV * 1000),\ + .uV_step = (DA9211_STEP_MV * 1000),\ + .enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\ + .enable_mask = DA9211_BUCKA_EN,\ + .vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\ + .vsel_mask = DA9211_VBUCK_MASK,\ + .owner = THIS_MODULE,\ +} + +static struct regulator_desc da9211_regulators[] = { + DA9211_BUCK(BUCKA), + DA9211_BUCK(BUCKB), +}; + +static irqreturn_t da9211_irq_handler(int irq, void *data) +{ + struct da9211 *chip = data; + int reg_val, err, ret = IRQ_NONE; + + err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, ®_val); + if (err < 0) + goto error_i2c; + + if (reg_val & DA9211_E_OV_CURR_A) { + regulator_notifier_call_chain(chip->rdev[0], + REGULATOR_EVENT_OVER_CURRENT, + rdev_get_drvdata(chip->rdev[0])); + + err = regmap_write(chip->regmap, DA9211_REG_EVENT_B, + DA9211_E_OV_CURR_A); + if (err < 0) + goto error_i2c; + + ret = IRQ_HANDLED; + } + + if (reg_val & DA9211_E_OV_CURR_B) { + regulator_notifier_call_chain(chip->rdev[1], + REGULATOR_EVENT_OVER_CURRENT, + rdev_get_drvdata(chip->rdev[1])); + + err = regmap_write(chip->regmap, DA9211_REG_EVENT_B, + DA9211_E_OV_CURR_B); + if (err < 0) + goto error_i2c; + + ret = IRQ_HANDLED; + } + + return ret; + +error_i2c: + dev_err(chip->dev, "I2C error : %d\n", err); + return IRQ_NONE; +} + +static int da9211_regulator_init(struct da9211 *chip) +{ + struct regulator_config config = { }; + int i, ret; + unsigned int data; + + ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data); + if (ret < 0) { + dev_err(chip->dev, "Failed to read CONTROL_E reg: %d\n", ret); + return ret; + } + + data &= DA9211_SLAVE_SEL; + /* If configuration for 1/2 bucks is different between platform data + * and the register, driver should exit. + */ + if ((chip->pdata->num_buck == 2 && data == 0x40) + || (chip->pdata->num_buck == 1 && data == 0x00)) { + if (data == 0) + chip->num_regulator = 1; + else + chip->num_regulator = 2; + } else { + dev_err(chip->dev, "Configuration is mismatched\n"); + return -EINVAL; + } + + for (i = 0; i < chip->num_regulator; i++) { + if (chip->pdata) + config.init_data = + &(chip->pdata->init_data[i]); + + config.dev = chip->dev; + config.driver_data = chip; + config.regmap = chip->regmap; + + chip->rdev[i] = devm_regulator_register(chip->dev, + &da9211_regulators[i], &config); + if (IS_ERR(chip->rdev[i])) { + dev_err(chip->dev, + "Failed to register DA9211 regulator\n"); + return PTR_ERR(chip->rdev[i]); + } + + if (chip->chip_irq != 0) { + ret = regmap_update_bits(chip->regmap, + DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 1); + if (ret < 0) { + dev_err(chip->dev, + "Failed to update mask reg: %d\n", ret); + return ret; + } + } + } + + return 0; +} +/* + * I2C driver interface functions + */ +static int da9211_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct da9211 *chip; + int error, ret; + + chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL); + + chip->dev = &i2c->dev; + chip->regmap = devm_regmap_init_i2c(i2c, &da9211_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; + } + + i2c_set_clientdata(i2c, chip); + + chip->pdata = i2c->dev.platform_data; + if (!chip->pdata) { + dev_err(&i2c->dev, "No platform init data supplied\n"); + return -ENODEV; + } + + chip->chip_irq = i2c->irq; + + if (chip->chip_irq != 0) { + ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL, + da9211_irq_handler, + IRQF_TRIGGER_LOW|IRQF_ONESHOT, + "da9211", chip); + if (ret != 0) { + dev_err(chip->dev, "Failed to request IRQ: %d\n", + chip->chip_irq); + return ret; + } + } else { + dev_warn(chip->dev, "No IRQ configured\n"); + } + + ret = da9211_regulator_init(chip); + + if (ret < 0) + dev_err(&i2c->dev, "Failed to initialize regulator: %d\n", ret); + + return ret; +} + +static const struct i2c_device_id da9211_i2c_id[] = { + {"da9211", 0}, + {}, +}; + +MODULE_DEVICE_TABLE(i2c, da9211_i2c_id); + +static struct i2c_driver da9211_regulator_driver = { + .driver = { + .name = "da9211", + .owner = THIS_MODULE, + }, + .probe = da9211_i2c_probe, + .id_table = da9211_i2c_id, +}; + +module_i2c_driver(da9211_regulator_driver); + +MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>"); +MODULE_DESCRIPTION("Regulator device driver for Dialog DA9211"); +MODULE_LICENSE("GPL v2"); |