diff options
Diffstat (limited to 'drivers/regulator/mp886x.c')
| -rw-r--r-- | drivers/regulator/mp886x.c | 374 |
1 files changed, 374 insertions, 0 deletions
diff --git a/drivers/regulator/mp886x.c b/drivers/regulator/mp886x.c new file mode 100644 index 000000000..8ad4722ec --- /dev/null +++ b/drivers/regulator/mp886x.c @@ -0,0 +1,374 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// MP8867/MP8869 regulator driver +// +// Copyright (C) 2020 Synaptics Incorporated +// +// Author: Jisheng Zhang <jszhang@kernel.org> + +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/of_regulator.h> + +#define MP886X_VSEL 0x00 +#define MP886X_V_BOOT (1 << 7) +#define MP886X_SYSCNTLREG1 0x01 +#define MP886X_MODE (1 << 0) +#define MP886X_SLEW_SHIFT 3 +#define MP886X_SLEW_MASK (0x7 << MP886X_SLEW_SHIFT) +#define MP886X_GO (1 << 6) +#define MP886X_EN (1 << 7) +#define MP8869_SYSCNTLREG2 0x02 + +struct mp886x_cfg_info { + const struct regulator_ops *rops; + const unsigned int slew_rates[8]; + const int switch_freq[4]; + const u8 fs_reg; + const u8 fs_shift; +}; + +struct mp886x_device_info { + struct device *dev; + struct regulator_desc desc; + struct regulator_init_data *regulator; + struct gpio_desc *en_gpio; + const struct mp886x_cfg_info *ci; + u32 r[2]; + unsigned int sel; +}; + +static void mp886x_set_switch_freq(struct mp886x_device_info *di, + struct regmap *regmap, + u32 freq) +{ + const struct mp886x_cfg_info *ci = di->ci; + int i; + + for (i = 0; i < ARRAY_SIZE(ci->switch_freq); i++) { + if (freq == ci->switch_freq[i]) { + regmap_update_bits(regmap, ci->fs_reg, + 0x3 << ci->fs_shift, i << ci->fs_shift); + return; + } + } + + dev_err(di->dev, "invalid frequency %d\n", freq); +} + +static int mp886x_set_mode(struct regulator_dev *rdev, unsigned int mode) +{ + switch (mode) { + case REGULATOR_MODE_FAST: + regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1, + MP886X_MODE, MP886X_MODE); + break; + case REGULATOR_MODE_NORMAL: + regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1, + MP886X_MODE, 0); + break; + default: + return -EINVAL; + } + return 0; +} + +static unsigned int mp886x_get_mode(struct regulator_dev *rdev) +{ + u32 val; + int ret; + + ret = regmap_read(rdev->regmap, MP886X_SYSCNTLREG1, &val); + if (ret < 0) + return ret; + if (val & MP886X_MODE) + return REGULATOR_MODE_FAST; + else + return REGULATOR_MODE_NORMAL; +} + +static int mp8869_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel) +{ + int ret; + + ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1, + MP886X_GO, MP886X_GO); + if (ret < 0) + return ret; + + sel <<= ffs(rdev->desc->vsel_mask) - 1; + return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, + MP886X_V_BOOT | rdev->desc->vsel_mask, sel); +} + +static inline unsigned int mp8869_scale(unsigned int uv, u32 r1, u32 r2) +{ + u32 tmp = uv * r1 / r2; + + return uv + tmp; +} + +static int mp8869_get_voltage_sel(struct regulator_dev *rdev) +{ + struct mp886x_device_info *di = rdev_get_drvdata(rdev); + int ret, uv; + unsigned int val; + bool fbloop; + + ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); + if (ret) + return ret; + + fbloop = val & MP886X_V_BOOT; + if (fbloop) { + uv = rdev->desc->min_uV; + uv = mp8869_scale(uv, di->r[0], di->r[1]); + return regulator_map_voltage_linear(rdev, uv, uv); + } + + val &= rdev->desc->vsel_mask; + val >>= ffs(rdev->desc->vsel_mask) - 1; + + return val; +} + +static const struct regulator_ops mp8869_regulator_ops = { + .set_voltage_sel = mp8869_set_voltage_sel, + .get_voltage_sel = mp8869_get_voltage_sel, + .set_voltage_time_sel = regulator_set_voltage_time_sel, + .map_voltage = regulator_map_voltage_linear, + .list_voltage = regulator_list_voltage_linear, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + .set_mode = mp886x_set_mode, + .get_mode = mp886x_get_mode, + .set_ramp_delay = regulator_set_ramp_delay_regmap, +}; + +static const struct mp886x_cfg_info mp8869_ci = { + .rops = &mp8869_regulator_ops, + .slew_rates = { + 40000, + 30000, + 20000, + 10000, + 5000, + 2500, + 1250, + 625, + }, + .switch_freq = { + 500000, + 750000, + 1000000, + 1250000, + }, + .fs_reg = MP8869_SYSCNTLREG2, + .fs_shift = 4, +}; + +static int mp8867_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel) +{ + struct mp886x_device_info *di = rdev_get_drvdata(rdev); + int ret, delta; + + ret = mp8869_set_voltage_sel(rdev, sel); + if (ret < 0) + return ret; + + delta = di->sel - sel; + if (abs(delta) <= 5) + ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1, + MP886X_GO, 0); + di->sel = sel; + + return ret; +} + +static int mp8867_get_voltage_sel(struct regulator_dev *rdev) +{ + struct mp886x_device_info *di = rdev_get_drvdata(rdev); + int ret, uv; + unsigned int val; + bool fbloop; + + ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); + if (ret) + return ret; + + fbloop = val & MP886X_V_BOOT; + + val &= rdev->desc->vsel_mask; + val >>= ffs(rdev->desc->vsel_mask) - 1; + + if (fbloop) { + uv = regulator_list_voltage_linear(rdev, val); + uv = mp8869_scale(uv, di->r[0], di->r[1]); + return regulator_map_voltage_linear(rdev, uv, uv); + } + + return val; +} + +static const struct regulator_ops mp8867_regulator_ops = { + .set_voltage_sel = mp8867_set_voltage_sel, + .get_voltage_sel = mp8867_get_voltage_sel, + .set_voltage_time_sel = regulator_set_voltage_time_sel, + .map_voltage = regulator_map_voltage_linear, + .list_voltage = regulator_list_voltage_linear, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + .set_mode = mp886x_set_mode, + .get_mode = mp886x_get_mode, + .set_ramp_delay = regulator_set_ramp_delay_regmap, +}; + +static const struct mp886x_cfg_info mp8867_ci = { + .rops = &mp8867_regulator_ops, + .slew_rates = { + 64000, + 32000, + 16000, + 8000, + 4000, + 2000, + 1000, + 500, + }, + .switch_freq = { + 500000, + 750000, + 1000000, + 1500000, + }, + .fs_reg = MP886X_SYSCNTLREG1, + .fs_shift = 1, +}; + +static int mp886x_regulator_register(struct mp886x_device_info *di, + struct regulator_config *config) +{ + struct regulator_desc *rdesc = &di->desc; + struct regulator_dev *rdev; + + rdesc->name = "mp886x-reg"; + rdesc->supply_name = "vin"; + rdesc->ops = di->ci->rops; + rdesc->type = REGULATOR_VOLTAGE; + rdesc->n_voltages = 128; + rdesc->enable_reg = MP886X_SYSCNTLREG1; + rdesc->enable_mask = MP886X_EN; + rdesc->min_uV = 600000; + rdesc->uV_step = 10000; + rdesc->vsel_reg = MP886X_VSEL; + rdesc->vsel_mask = 0x3f; + rdesc->ramp_reg = MP886X_SYSCNTLREG1; + rdesc->ramp_mask = MP886X_SLEW_MASK; + rdesc->ramp_delay_table = di->ci->slew_rates; + rdesc->n_ramp_values = ARRAY_SIZE(di->ci->slew_rates); + rdesc->owner = THIS_MODULE; + + rdev = devm_regulator_register(di->dev, &di->desc, config); + if (IS_ERR(rdev)) + return PTR_ERR(rdev); + di->sel = rdesc->ops->get_voltage_sel(rdev); + return 0; +} + +static const struct regmap_config mp886x_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +static int mp886x_i2c_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct device_node *np = dev->of_node; + struct mp886x_device_info *di; + struct regulator_config config = { }; + struct regmap *regmap; + u32 freq; + int ret; + + di = devm_kzalloc(dev, sizeof(struct mp886x_device_info), GFP_KERNEL); + if (!di) + return -ENOMEM; + + di->regulator = of_get_regulator_init_data(dev, np, &di->desc); + if (!di->regulator) { + dev_err(dev, "Platform data not found!\n"); + return -EINVAL; + } + + ret = of_property_read_u32_array(np, "mps,fb-voltage-divider", + di->r, 2); + if (ret) + return ret; + + di->en_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH); + if (IS_ERR(di->en_gpio)) + return PTR_ERR(di->en_gpio); + + di->ci = of_device_get_match_data(dev); + di->dev = dev; + + regmap = devm_regmap_init_i2c(client, &mp886x_regmap_config); + if (IS_ERR(regmap)) { + dev_err(dev, "Failed to allocate regmap!\n"); + return PTR_ERR(regmap); + } + i2c_set_clientdata(client, di); + + config.dev = di->dev; + config.init_data = di->regulator; + config.regmap = regmap; + config.driver_data = di; + config.of_node = np; + + if (!of_property_read_u32(np, "mps,switch-frequency-hz", &freq)) + mp886x_set_switch_freq(di, regmap, freq); + + ret = mp886x_regulator_register(di, &config); + if (ret < 0) + dev_err(dev, "Failed to register regulator!\n"); + return ret; +} + +static const struct of_device_id mp886x_dt_ids[] = { + { + .compatible = "mps,mp8867", + .data = &mp8867_ci + }, + { + .compatible = "mps,mp8869", + .data = &mp8869_ci + }, + { } +}; +MODULE_DEVICE_TABLE(of, mp886x_dt_ids); + +static const struct i2c_device_id mp886x_id[] = { + { "mp886x", }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, mp886x_id); + +static struct i2c_driver mp886x_regulator_driver = { + .driver = { + .name = "mp886x-regulator", + .of_match_table = of_match_ptr(mp886x_dt_ids), + }, + .probe_new = mp886x_i2c_probe, + .id_table = mp886x_id, +}; +module_i2c_driver(mp886x_regulator_driver); + +MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>"); +MODULE_DESCRIPTION("MP886x regulator driver"); +MODULE_LICENSE("GPL v2"); |