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/*
* Copyright (c) 2017 Rockchip Electronics Co. Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>
#include <linux/mfd/core.h>
#include <linux/mfd/rk618.h>
static const struct mfd_cell rk618_devs[] = {
{
.name = "rk618-codec",
.of_compatible = "rockchip,rk618-codec",
}, {
.name = "rk618-cru",
.of_compatible = "rockchip,rk618-cru",
}, {
.name = "rk618-dsi",
.of_compatible = "rockchip,rk618-dsi",
}, {
.name = "rk618-hdmi",
.of_compatible = "rockchip,rk618-hdmi",
}, {
.name = "rk618-lvds",
.of_compatible = "rockchip,rk618-lvds",
}, {
.name = "rk618-rgb",
.of_compatible = "rockchip,rk618-rgb",
}, {
.name = "rk618-scaler",
.of_compatible = "rockchip,rk618-scaler",
}, {
.name = "rk618-vif",
.of_compatible = "rockchip,rk618-vif",
},
};
static int rk618_power_on(struct rk618 *rk618)
{
u32 reg;
int ret;
ret = regulator_enable(rk618->supply);
if (ret < 0) {
dev_err(rk618->dev, "failed to enable supply: %d\n", ret);
return ret;
}
if (rk618->enable_gpio)
gpiod_direction_output(rk618->enable_gpio, 1);
usleep_range(1000, 2000);
ret = regmap_read(rk618->regmap, 0x0000, ®);
if (ret) {
gpiod_direction_output(rk618->reset_gpio, 0);
usleep_range(2000, 4000);
gpiod_direction_output(rk618->reset_gpio, 1);
usleep_range(50000, 60000);
gpiod_direction_output(rk618->reset_gpio, 0);
}
return 0;
}
static void rk618_power_off(struct rk618 *rk618)
{
gpiod_direction_output(rk618->reset_gpio, 1);
if (rk618->enable_gpio)
gpiod_direction_output(rk618->enable_gpio, 0);
regulator_disable(rk618->supply);
}
static const struct regmap_config rk618_regmap_config = {
.name = "core",
.reg_bits = 16,
.val_bits = 32,
.reg_stride = 4,
.max_register = 0x9c,
.reg_format_endian = REGMAP_ENDIAN_NATIVE,
.val_format_endian = REGMAP_ENDIAN_NATIVE,
};
static int
rk618_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct rk618 *rk618;
int ret;
rk618 = devm_kzalloc(dev, sizeof(*rk618), GFP_KERNEL);
if (!rk618)
return -ENOMEM;
rk618->dev = dev;
rk618->client = client;
i2c_set_clientdata(client, rk618);
rk618->supply = devm_regulator_get(dev, "power");
if (IS_ERR(rk618->supply))
return PTR_ERR(rk618->supply);
rk618->enable_gpio = devm_gpiod_get_optional(dev, "enable", 0);
if (IS_ERR(rk618->enable_gpio)) {
ret = PTR_ERR(rk618->enable_gpio);
dev_err(dev, "failed to request enable GPIO: %d\n", ret);
return ret;
}
rk618->reset_gpio = devm_gpiod_get(dev, "reset", 0);
if (IS_ERR(rk618->reset_gpio)) {
ret = PTR_ERR(rk618->reset_gpio);
dev_err(dev, "failed to request reset GPIO: %d\n", ret);
return ret;
}
rk618->clkin = devm_clk_get(dev, "clkin");
if (IS_ERR(rk618->clkin)) {
dev_err(dev, "failed to get clock\n");
return PTR_ERR(rk618->clkin);
}
ret = clk_prepare_enable(rk618->clkin);
if (ret) {
dev_err(dev, "unable to enable clock: %d\n", ret);
return ret;
}
rk618->regmap = devm_regmap_init_i2c(client, &rk618_regmap_config);
if (IS_ERR(rk618->regmap)) {
ret = PTR_ERR(rk618->regmap);
dev_err(dev, "failed to allocate register map: %d\n", ret);
goto err_clk_disable;
}
ret = rk618_power_on(rk618);
if (ret)
goto err_clk_disable;
ret = mfd_add_devices(dev, -1, rk618_devs, ARRAY_SIZE(rk618_devs),
NULL, 0, NULL);
if (ret) {
dev_err(dev, "failed to add subdev: %d\n", ret);
goto err_clk_disable;
}
return 0;
err_clk_disable:
clk_disable_unprepare(rk618->clkin);
return ret;
}
static int rk618_remove(struct i2c_client *client)
{
struct rk618 *rk618 = i2c_get_clientdata(client);
mfd_remove_devices(rk618->dev);
rk618_power_off(rk618);
clk_disable_unprepare(rk618->clkin);
return 0;
}
static void rk618_shutdown(struct i2c_client *client)
{
struct rk618 *rk618 = i2c_get_clientdata(client);
rk618_power_off(rk618);
clk_disable_unprepare(rk618->clkin);
}
static int __maybe_unused rk618_suspend(struct device *dev)
{
pinctrl_pm_select_sleep_state(dev);
return 0;
}
static int __maybe_unused rk618_resume(struct device *dev)
{
pinctrl_pm_select_default_state(dev);
return 0;
}
static const struct dev_pm_ops rk618_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(rk618_suspend, rk618_resume)
};
static const struct of_device_id rk618_of_match[] = {
{ .compatible = "rockchip,rk618", },
{}
};
MODULE_DEVICE_TABLE(of, rk618_of_match);
static const struct i2c_device_id rk618_i2c_id[] = {
{ "rk618", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, rk618_i2c_id);
static struct i2c_driver rk618_driver = {
.driver = {
.name = "rk618",
.of_match_table = of_match_ptr(rk618_of_match),
.pm = &rk618_pm_ops,
},
.probe = rk618_probe,
.remove = rk618_remove,
.shutdown = rk618_shutdown,
.id_table = rk618_i2c_id,
};
module_i2c_driver(rk618_driver);
MODULE_AUTHOR("Wyon Bi <bivvy.bi@rock-chips.com>");
MODULE_DESCRIPTION("Rockchip rk618 i2c driver");
MODULE_LICENSE("GPL v2");
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