diff options
Diffstat (limited to 'drivers/regulator/rt5190a-regulator.c')
| -rw-r--r-- | drivers/regulator/rt5190a-regulator.c | 517 |
1 files changed, 517 insertions, 0 deletions
diff --git a/drivers/regulator/rt5190a-regulator.c b/drivers/regulator/rt5190a-regulator.c new file mode 100644 index 0000000000..a53ed523b5 --- /dev/null +++ b/drivers/regulator/rt5190a-regulator.c @@ -0,0 +1,517 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include <dt-bindings/regulator/richtek,rt5190a-regulator.h> +#include <linux/bits.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/regulator/of_regulator.h> + +#define RT5190A_REG_MANUFACTURE 0x00 +#define RT5190A_REG_BUCK2VSEL 0x04 +#define RT5190A_REG_BUCK3VSEL 0x05 +#define RT5190A_REG_DCDCCNTL 0x06 +#define RT5190A_REG_ENABLE 0x07 +#define RT5190A_REG_DISCHARGE 0x09 +#define RT5190A_REG_PROTMODE 0x0A +#define RT5190A_REG_MUTECNTL 0x0B +#define RT5190A_REG_PGSTAT 0x0F +#define RT5190A_REG_OVINT 0x10 +#define RT5190A_REG_HOTDIEMASK 0x17 + +#define RT5190A_VSEL_MASK GENMASK(6, 0) +#define RT5190A_RID_BITMASK(rid) BIT(rid + 1) +#define RT5190A_BUCK1_DISCHG_MASK GENMASK(1, 0) +#define RT5190A_BUCK1_DISCHG_ONVAL 0x01 +#define RT5190A_OVERVOLT_MASK GENMASK(7, 0) +#define RT5190A_UNDERVOLT_MASK GENMASK(15, 8) +#define RT5190A_CH234OT_MASK BIT(29) +#define RT5190A_CHIPOT_MASK BIT(28) + +#define RT5190A_BUCK23_MINUV 600000 +#define RT5190A_BUCK23_MAXUV 1400000 +#define RT5190A_BUCK23_STEPUV 10000 +#define RT5190A_BUCK23_STEPNUM ((1400000 - 600000) / 10000 + 1) + +enum { + RT5190A_IDX_BUCK1 = 0, + RT5190A_IDX_BUCK2, + RT5190A_IDX_BUCK3, + RT5190A_IDX_BUCK4, + RT5190A_IDX_LDO, + RT5190A_MAX_IDX +}; + +struct rt5190a_priv { + struct device *dev; + struct regmap *regmap; + struct regulator_desc rdesc[RT5190A_MAX_IDX]; + struct regulator_dev *rdev[RT5190A_MAX_IDX]; +}; + +static int rt5190a_get_error_flags(struct regulator_dev *rdev, + unsigned int *flags) +{ + struct regmap *regmap = rdev_get_regmap(rdev); + int rid = rdev_get_id(rdev); + unsigned int pgood_stat; + int ret; + + ret = regmap_read(regmap, RT5190A_REG_PGSTAT, &pgood_stat); + if (ret) + return ret; + + if (!(pgood_stat & RT5190A_RID_BITMASK(rid))) + *flags = REGULATOR_ERROR_FAIL; + else + *flags = 0; + + return 0; +} + +static int rt5190a_fixed_buck_set_mode(struct regulator_dev *rdev, + unsigned int mode) +{ + struct regmap *regmap = rdev_get_regmap(rdev); + int rid = rdev_get_id(rdev); + unsigned int mask = RT5190A_RID_BITMASK(rid), val; + + switch (mode) { + case REGULATOR_MODE_FAST: + val = mask; + break; + case REGULATOR_MODE_NORMAL: + val = 0; + break; + default: + return -EINVAL; + } + + return regmap_update_bits(regmap, RT5190A_REG_DCDCCNTL, mask, val); +} + +static unsigned int rt5190a_fixed_buck_get_mode(struct regulator_dev *rdev) +{ + struct regmap *regmap = rdev_get_regmap(rdev); + int rid = rdev_get_id(rdev); + unsigned int val; + int ret; + + ret = regmap_read(regmap, RT5190A_REG_DCDCCNTL, &val); + if (ret) { + dev_err(&rdev->dev, "Failed to get mode [%d]\n", ret); + return ret; + } + + if (val & RT5190A_RID_BITMASK(rid)) + return REGULATOR_MODE_FAST; + + return REGULATOR_MODE_NORMAL; +} + +static const struct regulator_ops rt5190a_ranged_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_active_discharge = regulator_set_active_discharge_regmap, + .get_error_flags = rt5190a_get_error_flags, +}; + +static const struct regulator_ops rt5190a_fixed_buck_ops = { + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + .set_active_discharge = regulator_set_active_discharge_regmap, + .set_mode = rt5190a_fixed_buck_set_mode, + .get_mode = rt5190a_fixed_buck_get_mode, + .get_error_flags = rt5190a_get_error_flags, +}; + +static const struct regulator_ops rt5190a_fixed_ldo_ops = { + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + .set_active_discharge = regulator_set_active_discharge_regmap, + .get_error_flags = rt5190a_get_error_flags, +}; + +static irqreturn_t rt5190a_irq_handler(int irq, void *data) +{ + struct rt5190a_priv *priv = data; + __le32 raws; + unsigned int events, fields; + static const struct { + unsigned int bitmask; + unsigned int report; + } event_tbl[] = { + { RT5190A_OVERVOLT_MASK, REGULATOR_ERROR_REGULATION_OUT }, + { RT5190A_UNDERVOLT_MASK, REGULATOR_ERROR_UNDER_VOLTAGE } + }; + int i, j, ret; + + ret = regmap_raw_read(priv->regmap, RT5190A_REG_OVINT, &raws, + sizeof(raws)); + if (ret) { + dev_err(priv->dev, "Failed to read events\n"); + return IRQ_NONE; + } + + events = le32_to_cpu(raws); + + ret = regmap_raw_write(priv->regmap, RT5190A_REG_OVINT, &raws, + sizeof(raws)); + if (ret) + dev_err(priv->dev, "Failed to write-clear events\n"); + + /* Handle OV,UV events */ + for (i = 0; i < ARRAY_SIZE(event_tbl); i++) { + fields = events & event_tbl[i].bitmask; + fields >>= ffs(event_tbl[i].bitmask) - 1; + + for (j = 0; j < RT5190A_MAX_IDX; j++) { + if (!(fields & RT5190A_RID_BITMASK(j))) + continue; + + regulator_notifier_call_chain(priv->rdev[j], + event_tbl[i].report, + NULL); + } + } + + /* Handle CH234 OT event */ + if (events & RT5190A_CH234OT_MASK) { + for (j = RT5190A_IDX_BUCK2; j < RT5190A_IDX_LDO; j++) { + regulator_notifier_call_chain(priv->rdev[j], + REGULATOR_ERROR_OVER_TEMP, + NULL); + } + } + + /* Warning if CHIP OT occur */ + if (events & RT5190A_CHIPOT_MASK) + dev_warn(priv->dev, "CHIP overheat\n"); + + return IRQ_HANDLED; +} + +static unsigned int rt5190a_of_map_mode(unsigned int mode) +{ + switch (mode) { + case RT5190A_OPMODE_AUTO: + return REGULATOR_MODE_NORMAL; + case RT5190A_OPMODE_FPWM: + return REGULATOR_MODE_FAST; + default: + return REGULATOR_MODE_INVALID; + } +} + +static int rt5190a_of_parse_cb(struct rt5190a_priv *priv, int rid, + struct of_regulator_match *match) +{ + struct regulator_desc *desc = priv->rdesc + rid; + struct regulator_init_data *init_data = match->init_data; + struct device_node *np = match->of_node; + bool latchup_enable; + unsigned int mask = RT5190A_RID_BITMASK(rid), val; + + if (!init_data) + return 0; + + switch (rid) { + case RT5190A_IDX_BUCK1: + case RT5190A_IDX_BUCK4: + case RT5190A_IDX_LDO: + init_data->constraints.apply_uV = 0; + + if (init_data->constraints.min_uV == + init_data->constraints.max_uV) + desc->fixed_uV = init_data->constraints.min_uV; + else { + dev_err(priv->dev, + "Variable voltage for fixed regulator\n"); + return -EINVAL; + } + break; + default: + break; + } + + latchup_enable = of_property_read_bool(np, "richtek,latchup-enable"); + + /* latchup: 0, default hiccup: 1 */ + val = !latchup_enable ? mask : 0; + + return regmap_update_bits(priv->regmap, RT5190A_REG_PROTMODE, mask, val); +} + +static void rt5190a_fillin_regulator_desc(struct regulator_desc *desc, int rid) +{ + static const char * const regu_name[] = { "buck1", "buck2", + "buck3", "buck4", + "ldo" }; + static const char * const supply[] = { NULL, "vin2", "vin3", "vin4", + "vinldo" }; + + desc->name = regu_name[rid]; + desc->supply_name = supply[rid]; + desc->owner = THIS_MODULE; + desc->type = REGULATOR_VOLTAGE; + desc->id = rid; + desc->enable_reg = RT5190A_REG_ENABLE; + desc->enable_mask = RT5190A_RID_BITMASK(rid); + desc->active_discharge_reg = RT5190A_REG_DISCHARGE; + desc->active_discharge_mask = RT5190A_RID_BITMASK(rid); + desc->active_discharge_on = RT5190A_RID_BITMASK(rid); + + switch (rid) { + case RT5190A_IDX_BUCK1: + desc->active_discharge_mask = RT5190A_BUCK1_DISCHG_MASK; + desc->active_discharge_on = RT5190A_BUCK1_DISCHG_ONVAL; + desc->n_voltages = 1; + desc->ops = &rt5190a_fixed_buck_ops; + desc->of_map_mode = rt5190a_of_map_mode; + break; + case RT5190A_IDX_BUCK2: + desc->vsel_reg = RT5190A_REG_BUCK2VSEL; + desc->vsel_mask = RT5190A_VSEL_MASK; + desc->min_uV = RT5190A_BUCK23_MINUV; + desc->uV_step = RT5190A_BUCK23_STEPUV; + desc->n_voltages = RT5190A_BUCK23_STEPNUM; + desc->ops = &rt5190a_ranged_buck_ops; + break; + case RT5190A_IDX_BUCK3: + desc->vsel_reg = RT5190A_REG_BUCK3VSEL; + desc->vsel_mask = RT5190A_VSEL_MASK; + desc->min_uV = RT5190A_BUCK23_MINUV; + desc->uV_step = RT5190A_BUCK23_STEPUV; + desc->n_voltages = RT5190A_BUCK23_STEPNUM; + desc->ops = &rt5190a_ranged_buck_ops; + break; + case RT5190A_IDX_BUCK4: + desc->n_voltages = 1; + desc->ops = &rt5190a_fixed_buck_ops; + desc->of_map_mode = rt5190a_of_map_mode; + break; + case RT5190A_IDX_LDO: + desc->n_voltages = 1; + desc->ops = &rt5190a_fixed_ldo_ops; + break; + } +} + +static struct of_regulator_match rt5190a_regulator_match[] = { + { .name = "buck1", }, + { .name = "buck2", }, + { .name = "buck3", }, + { .name = "buck4", }, + { .name = "ldo", } +}; + +static int rt5190a_parse_regulator_dt_data(struct rt5190a_priv *priv) +{ + struct device_node *regulator_np; + struct regulator_desc *reg_desc; + struct of_regulator_match *match; + int i, ret; + + for (i = 0; i < RT5190A_MAX_IDX; i++) { + reg_desc = priv->rdesc + i; + match = rt5190a_regulator_match + i; + + rt5190a_fillin_regulator_desc(reg_desc, i); + + match->desc = reg_desc; + } + + regulator_np = of_get_child_by_name(priv->dev->of_node, "regulators"); + if (!regulator_np) { + dev_err(priv->dev, "Could not find 'regulators' node\n"); + return -ENODEV; + } + + ret = of_regulator_match(priv->dev, regulator_np, + rt5190a_regulator_match, + ARRAY_SIZE(rt5190a_regulator_match)); + + of_node_put(regulator_np); + + if (ret < 0) { + dev_err(priv->dev, + "Error parsing regulator init data: %d\n", ret); + return ret; + } + + for (i = 0; i < RT5190A_MAX_IDX; i++) { + match = rt5190a_regulator_match + i; + + ret = rt5190a_of_parse_cb(priv, i, match); + if (ret) { + dev_err(priv->dev, "Failed in [%d] of_parse_cb\n", i); + return ret; + } + } + + return 0; +} + +static const struct reg_sequence rt5190a_init_patch[] = { + { 0x09, 0x3d, }, + { 0x0a, 0x3e, }, + { 0x0b, 0x01, }, + { 0x10, 0xff, }, + { 0x11, 0xff, }, + { 0x12, 0xff, }, + { 0x13, 0xff, }, + { 0x14, 0, }, + { 0x15, 0, }, + { 0x16, 0x3e, }, + { 0x17, 0, } +}; + +static int rt5190a_device_initialize(struct rt5190a_priv *priv) +{ + bool mute_enable; + int ret; + + ret = regmap_register_patch(priv->regmap, rt5190a_init_patch, + ARRAY_SIZE(rt5190a_init_patch)); + if (ret) { + dev_err(priv->dev, "Failed to do register patch\n"); + return ret; + } + + mute_enable = device_property_read_bool(priv->dev, + "richtek,mute-enable"); + + if (mute_enable) { + ret = regmap_write(priv->regmap, RT5190A_REG_MUTECNTL, 0x00); + if (ret) { + dev_err(priv->dev, "Failed to enable mute function\n"); + return ret; + } + } + + return 0; +} + +static int rt5190a_device_check(struct rt5190a_priv *priv) +{ + u16 devid; + int ret; + + ret = regmap_raw_read(priv->regmap, RT5190A_REG_MANUFACTURE, &devid, + sizeof(devid)); + if (ret) + return ret; + + if (devid) { + dev_err(priv->dev, "Incorrect device id 0x%04x\n", devid); + return -ENODEV; + } + + return 0; +} + +static const struct regmap_config rt5190a_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = RT5190A_REG_HOTDIEMASK, +}; + +static int rt5190a_probe(struct i2c_client *i2c) +{ + struct rt5190a_priv *priv; + struct regulator_config cfg = {}; + int i, ret; + + priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = &i2c->dev; + + priv->regmap = devm_regmap_init_i2c(i2c, &rt5190a_regmap_config); + if (IS_ERR(priv->regmap)) { + dev_err(&i2c->dev, "Failed to allocate regmap\n"); + return PTR_ERR(priv->regmap); + } + + ret = rt5190a_device_check(priv); + if (ret) { + dev_err(&i2c->dev, "Failed to check device %d\n", ret); + return ret; + } + + ret = rt5190a_device_initialize(priv); + if (ret) { + dev_err(&i2c->dev, "Failed to initialize the device\n"); + return ret; + } + + ret = rt5190a_parse_regulator_dt_data(priv); + if (ret) { + dev_err(&i2c->dev, "Failed to parse regulator dt\n"); + return ret; + } + + cfg.dev = &i2c->dev; + cfg.regmap = priv->regmap; + + for (i = 0; i < RT5190A_MAX_IDX; i++) { + struct regulator_desc *desc = priv->rdesc + i; + struct of_regulator_match *match = rt5190a_regulator_match + i; + + cfg.init_data = match->init_data; + cfg.of_node = match->of_node; + + priv->rdev[i] = devm_regulator_register(&i2c->dev, desc, &cfg); + if (IS_ERR(priv->rdev[i])) { + dev_err(&i2c->dev, "Failed to register regulator %s\n", + desc->name); + return PTR_ERR(priv->rdev[i]); + } + } + + if (i2c->irq) { + ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, + rt5190a_irq_handler, + IRQF_ONESHOT, + dev_name(&i2c->dev), priv); + if (ret) { + dev_err(&i2c->dev, "Failed to register interrupt\n"); + return ret; + } + } + + return 0; +} + +static const struct of_device_id __maybe_unused rt5190a_device_table[] = { + { .compatible = "richtek,rt5190a", }, + {} +}; +MODULE_DEVICE_TABLE(of, rt5190a_device_table); + +static struct i2c_driver rt5190a_driver = { + .driver = { + .name = "rt5190a", + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + .of_match_table = rt5190a_device_table, + }, + .probe = rt5190a_probe, +}; +module_i2c_driver(rt5190a_driver); + +MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>"); +MODULE_DESCRIPTION("Richtek RT5190A Regulator Driver"); +MODULE_LICENSE("GPL v2"); |