mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-28 21:33:52 +00:00
regulator: rt4801: Add support for RT4801 Display Bias regulator driver
Adds support for the RT4801 DSV. It has two regulators (DSVP/DSVN) with an I2C interface. DSVP/DSVN can provide the display panel module for the positive/negative voltage range from (+/-)4V to (+/-)6V. Signed-off-by: ChiYuan Huang <cy_huang@richtek.com> Link: https://lore.kernel.org/r/1597461262-25878-1-git-send-email-u0084500@gmail.com Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
ChiYuan Huang
Mark Brown
parent
b2ad0be508
commit
5bbbfc7f7f
3 changed files with 231 additions and 0 deletions
|
|
@ -894,6 +894,13 @@ config REGULATOR_RN5T618
|
|||
config REGULATOR_ROHM
|
||||
tristate
|
||||
|
||||
config REGULATOR_RT4801
|
||||
tristate "Richtek RT4801 Regulators"
|
||||
depends on I2C
|
||||
help
|
||||
This adds support for voltage regulators in Richtek RT4801 Display Bias IC.
|
||||
The device supports two regulators (DSVP/DSVN).
|
||||
|
||||
config REGULATOR_RT5033
|
||||
tristate "Richtek RT5033 Regulators"
|
||||
depends on MFD_RT5033
|
||||
|
|
|
|||
|
|
@ -111,6 +111,7 @@ obj-$(CONFIG_REGULATOR_RC5T583) += rc5t583-regulator.o
|
|||
obj-$(CONFIG_REGULATOR_RK808) += rk808-regulator.o
|
||||
obj-$(CONFIG_REGULATOR_RN5T618) += rn5t618-regulator.o
|
||||
obj-$(CONFIG_REGULATOR_ROHM) += rohm-regulator.o
|
||||
obj-$(CONFIG_REGULATOR_RT4801) += rt4801-regulator.o
|
||||
obj-$(CONFIG_REGULATOR_RT5033) += rt5033-regulator.o
|
||||
obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o
|
||||
obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
|
||||
|
|
|
|||
223
drivers/regulator/rt4801-regulator.c
Normal file
223
drivers/regulator/rt4801-regulator.c
Normal file
|
|
@ -0,0 +1,223 @@
|
|||
// SPDX-License-Identifier: GPL-2.0+
|
||||
|
||||
#include <linux/gpio/consumer.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/regmap.h>
|
||||
#include <linux/regulator/driver.h>
|
||||
|
||||
#define RT4801_REG_VOP 0x00
|
||||
#define RT4801_REG_VON 0x01
|
||||
#define RT4801_REG_APPS 0x03
|
||||
|
||||
#define VOUT_MASK 0x1F
|
||||
|
||||
#define MIN_UV 4000000
|
||||
#define STEP_UV 100000
|
||||
#define MAX_UV 6000000
|
||||
#define N_VOLTAGES ((MAX_UV - MIN_UV) / STEP_UV + 1)
|
||||
|
||||
#define DSV_OUT_POS 0
|
||||
#define DSV_OUT_NEG 1
|
||||
#define DSV_OUT_MAX 2
|
||||
|
||||
#define DSVP_ENABLE BIT(0)
|
||||
#define DSVN_ENABLE BIT(1)
|
||||
#define DSVALL_ENABLE (DSVP_ENABLE | DSVN_ENABLE)
|
||||
|
||||
struct rt4801_priv {
|
||||
struct device *dev;
|
||||
struct gpio_descs *enable_gpios;
|
||||
unsigned int enable_flag;
|
||||
unsigned int volt_sel[DSV_OUT_MAX];
|
||||
};
|
||||
|
||||
static int rt4801_set_voltage_sel(struct regulator_dev *rdev, unsigned int selector)
|
||||
{
|
||||
struct rt4801_priv *priv = rdev_get_drvdata(rdev);
|
||||
int id = rdev_get_id(rdev), ret;
|
||||
|
||||
if (priv->enable_flag & BIT(id)) {
|
||||
ret = regulator_set_voltage_sel_regmap(rdev, selector);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
priv->volt_sel[id] = selector;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int rt4801_get_voltage_sel(struct regulator_dev *rdev)
|
||||
{
|
||||
struct rt4801_priv *priv = rdev_get_drvdata(rdev);
|
||||
int id = rdev_get_id(rdev);
|
||||
|
||||
if (priv->enable_flag & BIT(id))
|
||||
return regulator_get_voltage_sel_regmap(rdev);
|
||||
|
||||
return priv->volt_sel[id];
|
||||
}
|
||||
|
||||
static int rt4801_enable(struct regulator_dev *rdev)
|
||||
{
|
||||
struct rt4801_priv *priv = rdev_get_drvdata(rdev);
|
||||
struct gpio_descs *gpios = priv->enable_gpios;
|
||||
int id = rdev_get_id(rdev), ret;
|
||||
|
||||
if (gpios->ndescs <= id) {
|
||||
dev_warn(&rdev->dev, "no dedicated gpio can control\n");
|
||||
goto bypass_gpio;
|
||||
}
|
||||
|
||||
gpiod_set_value(gpios->desc[id], 1);
|
||||
|
||||
bypass_gpio:
|
||||
ret = regmap_write(rdev->regmap, rdev->desc->vsel_reg, priv->volt_sel[id]);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
priv->enable_flag |= BIT(id);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int rt4801_disable(struct regulator_dev *rdev)
|
||||
{
|
||||
struct rt4801_priv *priv = rdev_get_drvdata(rdev);
|
||||
struct gpio_descs *gpios = priv->enable_gpios;
|
||||
int id = rdev_get_id(rdev);
|
||||
|
||||
if (gpios->ndescs <= id) {
|
||||
dev_warn(&rdev->dev, "no dedicated gpio can control\n");
|
||||
goto bypass_gpio;
|
||||
}
|
||||
|
||||
gpiod_set_value(gpios->desc[id], 0);
|
||||
|
||||
bypass_gpio:
|
||||
priv->enable_flag &= ~BIT(id);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int rt4801_is_enabled(struct regulator_dev *rdev)
|
||||
{
|
||||
struct rt4801_priv *priv = rdev_get_drvdata(rdev);
|
||||
int id = rdev_get_id(rdev);
|
||||
|
||||
return !!(priv->enable_flag & BIT(id));
|
||||
}
|
||||
|
||||
static const struct regulator_ops rt4801_regulator_ops = {
|
||||
.list_voltage = regulator_list_voltage_linear,
|
||||
.set_voltage_sel = rt4801_set_voltage_sel,
|
||||
.get_voltage_sel = rt4801_get_voltage_sel,
|
||||
.enable = rt4801_enable,
|
||||
.disable = rt4801_disable,
|
||||
.is_enabled = rt4801_is_enabled,
|
||||
};
|
||||
|
||||
static const struct regulator_desc rt4801_regulator_descs[] = {
|
||||
{
|
||||
.name = "DSVP",
|
||||
.ops = &rt4801_regulator_ops,
|
||||
.of_match = of_match_ptr("DSVP"),
|
||||
.type = REGULATOR_VOLTAGE,
|
||||
.id = DSV_OUT_POS,
|
||||
.min_uV = MIN_UV,
|
||||
.uV_step = STEP_UV,
|
||||
.n_voltages = N_VOLTAGES,
|
||||
.owner = THIS_MODULE,
|
||||
.vsel_reg = RT4801_REG_VOP,
|
||||
.vsel_mask = VOUT_MASK,
|
||||
},
|
||||
{
|
||||
.name = "DSVN",
|
||||
.ops = &rt4801_regulator_ops,
|
||||
.of_match = of_match_ptr("DSVN"),
|
||||
.type = REGULATOR_VOLTAGE,
|
||||
.id = DSV_OUT_NEG,
|
||||
.min_uV = MIN_UV,
|
||||
.uV_step = STEP_UV,
|
||||
.n_voltages = N_VOLTAGES,
|
||||
.owner = THIS_MODULE,
|
||||
.vsel_reg = RT4801_REG_VON,
|
||||
.vsel_mask = VOUT_MASK,
|
||||
},
|
||||
};
|
||||
|
||||
static const struct regmap_config rt4801_regmap_config = {
|
||||
.reg_bits = 8,
|
||||
.val_bits = 8,
|
||||
.max_register = RT4801_REG_APPS,
|
||||
};
|
||||
|
||||
static int rt4801_probe(struct i2c_client *i2c)
|
||||
{
|
||||
struct rt4801_priv *priv;
|
||||
struct regmap *regmap;
|
||||
int i;
|
||||
|
||||
priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
|
||||
if (!priv)
|
||||
return -ENOMEM;
|
||||
|
||||
priv->dev = &i2c->dev;
|
||||
/* bootloader will on, driver only reconfigure enable to all output high */
|
||||
priv->enable_flag = DSVALL_ENABLE;
|
||||
|
||||
regmap = devm_regmap_init_i2c(i2c, &rt4801_regmap_config);
|
||||
if (IS_ERR(regmap)) {
|
||||
dev_err(&i2c->dev, "Failed to init regmap\n");
|
||||
return PTR_ERR(regmap);
|
||||
}
|
||||
|
||||
priv->enable_gpios = devm_gpiod_get_array_optional(&i2c->dev, "enable", GPIOD_OUT_HIGH);
|
||||
if (IS_ERR(priv->enable_gpios)) {
|
||||
dev_err(&i2c->dev, "Failed to get gpios\n");
|
||||
return PTR_ERR(priv->enable_gpios);
|
||||
}
|
||||
|
||||
for (i = 0; i < DSV_OUT_MAX; i++) {
|
||||
const struct regulator_desc *desc = rt4801_regulator_descs + i;
|
||||
struct regulator_config config = { .dev = &i2c->dev, .driver_data = priv,
|
||||
.regmap = regmap, };
|
||||
struct regulator_dev *rdev;
|
||||
unsigned int val;
|
||||
int ret;
|
||||
|
||||
/* initialize volt_sel variable */
|
||||
ret = regmap_read(regmap, desc->vsel_reg, &val);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
priv->volt_sel[i] = val & desc->vsel_mask;
|
||||
|
||||
rdev = devm_regulator_register(&i2c->dev, desc, &config);
|
||||
if (IS_ERR(rdev)) {
|
||||
dev_err(&i2c->dev, "Failed to register [%d] regulator\n", i);
|
||||
return PTR_ERR(rdev);
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id rt4801_of_id[] = {
|
||||
{ .compatible = "richtek,rt4801", },
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, rt4801_of_id);
|
||||
|
||||
static struct i2c_driver rt4801_driver = {
|
||||
.driver = {
|
||||
.name = "rt4801",
|
||||
.of_match_table = of_match_ptr(rt4801_of_id),
|
||||
},
|
||||
.probe_new = rt4801_probe,
|
||||
};
|
||||
module_i2c_driver(rt4801_driver);
|
||||
|
||||
MODULE_AUTHOR("ChiYuan Hwang <cy_huang@richtek.com>");
|
||||
MODULE_DESCRIPTION("Richtek RT4801 Display Bias Driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in a new issue