diff options
Diffstat (limited to 'drivers/regulator/rt6160-regulator.c')
| -rw-r--r-- | drivers/regulator/rt6160-regulator.c | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/drivers/regulator/rt6160-regulator.c b/drivers/regulator/rt6160-regulator.c new file mode 100644 index 0000000000..e2a0eee95c --- /dev/null +++ b/drivers/regulator/rt6160-regulator.c @@ -0,0 +1,320 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/of_regulator.h> + +#define RT6160_MODE_AUTO 0 +#define RT6160_MODE_FPWM 1 + +#define RT6160_REG_CNTL 0x01 +#define RT6160_REG_STATUS 0x02 +#define RT6160_REG_DEVID 0x03 +#define RT6160_REG_VSELL 0x04 +#define RT6160_REG_VSELH 0x05 +#define RT6160_NUM_REGS (RT6160_REG_VSELH + 1) + +#define RT6160_FPWM_MASK BIT(3) +#define RT6160_RAMPRATE_MASK GENMASK(1, 0) +#define RT6160_VID_MASK GENMASK(7, 4) +#define RT6160_VSEL_MASK GENMASK(6, 0) +#define RT6160_HDSTAT_MASK BIT(4) +#define RT6160_UVSTAT_MASK BIT(3) +#define RT6160_OCSTAT_MASK BIT(2) +#define RT6160_TSDSTAT_MASK BIT(1) +#define RT6160_PGSTAT_MASK BIT(0) + +#define RT6160_VENDOR_ID 0xA0 +#define RT6160_VOUT_MINUV 2025000 +#define RT6160_VOUT_MAXUV 5200000 +#define RT6160_VOUT_STPUV 25000 +#define RT6160_N_VOUTS ((RT6160_VOUT_MAXUV - RT6160_VOUT_MINUV) / RT6160_VOUT_STPUV + 1) + +#define RT6160_I2CRDY_TIMEUS 100 + +struct rt6160_priv { + struct regulator_desc desc; + struct gpio_desc *enable_gpio; + struct regmap *regmap; + bool enable_state; +}; + +static const unsigned int rt6160_ramp_tables[] = { + 1000, 2500, 5000, 10000 +}; + +static int rt6160_enable(struct regulator_dev *rdev) +{ + struct rt6160_priv *priv = rdev_get_drvdata(rdev); + + if (!priv->enable_gpio) + return 0; + + gpiod_set_value_cansleep(priv->enable_gpio, 1); + priv->enable_state = true; + + usleep_range(RT6160_I2CRDY_TIMEUS, RT6160_I2CRDY_TIMEUS + 100); + + regcache_cache_only(priv->regmap, false); + return regcache_sync(priv->regmap); +} + +static int rt6160_disable(struct regulator_dev *rdev) +{ + struct rt6160_priv *priv = rdev_get_drvdata(rdev); + + if (!priv->enable_gpio) + return -EINVAL; + + /* Mark regcache as dirty and cache only before HW disabled */ + regcache_cache_only(priv->regmap, true); + regcache_mark_dirty(priv->regmap); + + priv->enable_state = false; + gpiod_set_value_cansleep(priv->enable_gpio, 0); + + return 0; +} + +static int rt6160_is_enabled(struct regulator_dev *rdev) +{ + struct rt6160_priv *priv = rdev_get_drvdata(rdev); + + return priv->enable_state ? 1 : 0; +} + +static int rt6160_set_mode(struct regulator_dev *rdev, unsigned int mode) +{ + struct regmap *regmap = rdev_get_regmap(rdev); + unsigned int mode_val; + + switch (mode) { + case REGULATOR_MODE_FAST: + mode_val = RT6160_FPWM_MASK; + break; + case REGULATOR_MODE_NORMAL: + mode_val = 0; + break; + default: + dev_err(&rdev->dev, "mode not supported\n"); + return -EINVAL; + } + + return regmap_update_bits(regmap, RT6160_REG_CNTL, RT6160_FPWM_MASK, mode_val); +} + +static unsigned int rt6160_get_mode(struct regulator_dev *rdev) +{ + struct regmap *regmap = rdev_get_regmap(rdev); + unsigned int val; + int ret; + + ret = regmap_read(regmap, RT6160_REG_CNTL, &val); + if (ret) + return ret; + + if (val & RT6160_FPWM_MASK) + return REGULATOR_MODE_FAST; + + return REGULATOR_MODE_NORMAL; +} + +static int rt6160_set_suspend_voltage(struct regulator_dev *rdev, int uV) +{ + struct regmap *regmap = rdev_get_regmap(rdev); + unsigned int suspend_vsel_reg; + int vsel; + + vsel = regulator_map_voltage_linear(rdev, uV, uV); + if (vsel < 0) + return vsel; + + if (rdev->desc->vsel_reg == RT6160_REG_VSELL) + suspend_vsel_reg = RT6160_REG_VSELH; + else + suspend_vsel_reg = RT6160_REG_VSELL; + + return regmap_update_bits(regmap, suspend_vsel_reg, + RT6160_VSEL_MASK, vsel); +} + +static int rt6160_get_error_flags(struct regulator_dev *rdev, unsigned int *flags) +{ + struct regmap *regmap = rdev_get_regmap(rdev); + unsigned int val, events = 0; + int ret; + + ret = regmap_read(regmap, RT6160_REG_STATUS, &val); + if (ret) + return ret; + + if (val & (RT6160_HDSTAT_MASK | RT6160_TSDSTAT_MASK)) + events |= REGULATOR_ERROR_OVER_TEMP; + + if (val & RT6160_UVSTAT_MASK) + events |= REGULATOR_ERROR_UNDER_VOLTAGE; + + if (val & RT6160_OCSTAT_MASK) + events |= REGULATOR_ERROR_OVER_CURRENT; + + if (val & RT6160_PGSTAT_MASK) + events |= REGULATOR_ERROR_FAIL; + + *flags = events; + return 0; +} + +static const struct regulator_ops rt6160_regulator_ops = { + .list_voltage = regulator_list_voltage_linear, + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + + .enable = rt6160_enable, + .disable = rt6160_disable, + .is_enabled = rt6160_is_enabled, + + .set_mode = rt6160_set_mode, + .get_mode = rt6160_get_mode, + .set_suspend_voltage = rt6160_set_suspend_voltage, + .set_ramp_delay = regulator_set_ramp_delay_regmap, + .get_error_flags = rt6160_get_error_flags, +}; + +static unsigned int rt6160_of_map_mode(unsigned int mode) +{ + switch (mode) { + case RT6160_MODE_FPWM: + return REGULATOR_MODE_FAST; + case RT6160_MODE_AUTO: + return REGULATOR_MODE_NORMAL; + } + + return REGULATOR_MODE_INVALID; +} + +static bool rt6160_is_accessible_reg(struct device *dev, unsigned int reg) +{ + if (reg >= RT6160_REG_CNTL && reg <= RT6160_REG_VSELH) + return true; + return false; +} + +static bool rt6160_is_volatile_reg(struct device *dev, unsigned int reg) +{ + if (reg == RT6160_REG_STATUS) + return true; + return false; +} + +static const struct regmap_config rt6160_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = RT6160_REG_VSELH, + .num_reg_defaults_raw = RT6160_NUM_REGS, + .cache_type = REGCACHE_FLAT, + + .writeable_reg = rt6160_is_accessible_reg, + .readable_reg = rt6160_is_accessible_reg, + .volatile_reg = rt6160_is_volatile_reg, +}; + +static int rt6160_probe(struct i2c_client *i2c) +{ + struct rt6160_priv *priv; + struct regulator_config regulator_cfg = {}; + struct regulator_dev *rdev; + bool vsel_active_low; + unsigned int devid; + int ret; + + priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + vsel_active_low = + device_property_present(&i2c->dev, "richtek,vsel-active-low"); + + priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable", GPIOD_OUT_HIGH); + if (IS_ERR(priv->enable_gpio)) { + dev_err(&i2c->dev, "Failed to get 'enable' gpio\n"); + return PTR_ERR(priv->enable_gpio); + } + priv->enable_state = true; + + usleep_range(RT6160_I2CRDY_TIMEUS, RT6160_I2CRDY_TIMEUS + 100); + + priv->regmap = devm_regmap_init_i2c(i2c, &rt6160_regmap_config); + if (IS_ERR(priv->regmap)) { + ret = PTR_ERR(priv->regmap); + dev_err(&i2c->dev, "Failed to init regmap (%d)\n", ret); + return ret; + } + + ret = regmap_read(priv->regmap, RT6160_REG_DEVID, &devid); + if (ret) + return ret; + + if ((devid & RT6160_VID_MASK) != RT6160_VENDOR_ID) { + dev_err(&i2c->dev, "VID not correct [0x%02x]\n", devid); + return -ENODEV; + } + + priv->desc.name = "rt6160-buckboost"; + priv->desc.type = REGULATOR_VOLTAGE; + priv->desc.owner = THIS_MODULE; + priv->desc.min_uV = RT6160_VOUT_MINUV; + priv->desc.uV_step = RT6160_VOUT_STPUV; + if (vsel_active_low) + priv->desc.vsel_reg = RT6160_REG_VSELL; + else + priv->desc.vsel_reg = RT6160_REG_VSELH; + priv->desc.vsel_mask = RT6160_VSEL_MASK; + priv->desc.n_voltages = RT6160_N_VOUTS; + priv->desc.ramp_reg = RT6160_REG_CNTL; + priv->desc.ramp_mask = RT6160_RAMPRATE_MASK; + priv->desc.ramp_delay_table = rt6160_ramp_tables; + priv->desc.n_ramp_values = ARRAY_SIZE(rt6160_ramp_tables); + priv->desc.of_map_mode = rt6160_of_map_mode; + priv->desc.ops = &rt6160_regulator_ops; + + regulator_cfg.dev = &i2c->dev; + regulator_cfg.of_node = i2c->dev.of_node; + regulator_cfg.regmap = priv->regmap; + regulator_cfg.driver_data = priv; + regulator_cfg.init_data = of_get_regulator_init_data(&i2c->dev, i2c->dev.of_node, + &priv->desc); + + rdev = devm_regulator_register(&i2c->dev, &priv->desc, ®ulator_cfg); + if (IS_ERR(rdev)) { + dev_err(&i2c->dev, "Failed to register regulator\n"); + return PTR_ERR(rdev); + } + + return 0; +} + +static const struct of_device_id __maybe_unused rt6160_of_match_table[] = { + { .compatible = "richtek,rt6160", }, + {} +}; +MODULE_DEVICE_TABLE(of, rt6160_of_match_table); + +static struct i2c_driver rt6160_driver = { + .driver = { + .name = "rt6160", + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + .of_match_table = rt6160_of_match_table, + }, + .probe = rt6160_probe, +}; +module_i2c_driver(rt6160_driver); + +MODULE_DESCRIPTION("Richtek RT6160 voltage regulator driver"); +MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>"); +MODULE_LICENSE("GPL v2"); |