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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2021-2022 Linaro Ltd.
* Copyright (C) 2018-2020 The Linux Foundation
*/
#include <linux/bits.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/regmap.h>
#include <linux/usb/typec_dp.h>
#include <linux/usb/typec_mux.h>
#define FSA4480_SWITCH_ENABLE 0x04
#define FSA4480_SWITCH_SELECT 0x05
#define FSA4480_SWITCH_STATUS1 0x07
#define FSA4480_SLOW_L 0x08
#define FSA4480_SLOW_R 0x09
#define FSA4480_SLOW_MIC 0x0a
#define FSA4480_SLOW_SENSE 0x0b
#define FSA4480_SLOW_GND 0x0c
#define FSA4480_DELAY_L_R 0x0d
#define FSA4480_DELAY_L_MIC 0x0e
#define FSA4480_DELAY_L_SENSE 0x0f
#define FSA4480_DELAY_L_AGND 0x10
#define FSA4480_RESET 0x1e
#define FSA4480_MAX_REGISTER 0x1f
#define FSA4480_ENABLE_DEVICE BIT(7)
#define FSA4480_ENABLE_SBU GENMASK(6, 5)
#define FSA4480_ENABLE_USB GENMASK(4, 3)
#define FSA4480_SEL_SBU_REVERSE GENMASK(6, 5)
#define FSA4480_SEL_USB GENMASK(4, 3)
struct fsa4480 {
struct i2c_client *client;
/* used to serialize concurrent change requests */
struct mutex lock;
struct typec_switch_dev *sw;
struct typec_mux_dev *mux;
struct regmap *regmap;
u8 cur_enable;
u8 cur_select;
};
static const struct regmap_config fsa4480_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = FSA4480_MAX_REGISTER,
/* Accesses only done under fsa4480->lock */
.disable_locking = true,
};
static int fsa4480_switch_set(struct typec_switch_dev *sw,
enum typec_orientation orientation)
{
struct fsa4480 *fsa = typec_switch_get_drvdata(sw);
u8 new_sel;
mutex_lock(&fsa->lock);
new_sel = FSA4480_SEL_USB;
if (orientation == TYPEC_ORIENTATION_REVERSE)
new_sel |= FSA4480_SEL_SBU_REVERSE;
if (new_sel == fsa->cur_select)
goto out_unlock;
if (fsa->cur_enable & FSA4480_ENABLE_SBU) {
/* Disable SBU output while re-configuring the switch */
regmap_write(fsa->regmap, FSA4480_SWITCH_ENABLE,
fsa->cur_enable & ~FSA4480_ENABLE_SBU);
/* 35us to allow the SBU switch to turn off */
usleep_range(35, 1000);
}
regmap_write(fsa->regmap, FSA4480_SWITCH_SELECT, new_sel);
fsa->cur_select = new_sel;
if (fsa->cur_enable & FSA4480_ENABLE_SBU) {
regmap_write(fsa->regmap, FSA4480_SWITCH_ENABLE, fsa->cur_enable);
/* 15us to allow the SBU switch to turn on again */
usleep_range(15, 1000);
}
out_unlock:
mutex_unlock(&fsa->lock);
return 0;
}
static int fsa4480_mux_set(struct typec_mux_dev *mux, struct typec_mux_state *state)
{
struct fsa4480 *fsa = typec_mux_get_drvdata(mux);
u8 new_enable;
mutex_lock(&fsa->lock);
new_enable = FSA4480_ENABLE_DEVICE | FSA4480_ENABLE_USB;
if (state->mode >= TYPEC_DP_STATE_A)
new_enable |= FSA4480_ENABLE_SBU;
if (new_enable == fsa->cur_enable)
goto out_unlock;
regmap_write(fsa->regmap, FSA4480_SWITCH_ENABLE, new_enable);
fsa->cur_enable = new_enable;
if (new_enable & FSA4480_ENABLE_SBU) {
/* 15us to allow the SBU switch to turn off */
usleep_range(15, 1000);
}
out_unlock:
mutex_unlock(&fsa->lock);
return 0;
}
static int fsa4480_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct typec_switch_desc sw_desc = { };
struct typec_mux_desc mux_desc = { };
struct fsa4480 *fsa;
fsa = devm_kzalloc(dev, sizeof(*fsa), GFP_KERNEL);
if (!fsa)
return -ENOMEM;
fsa->client = client;
mutex_init(&fsa->lock);
fsa->regmap = devm_regmap_init_i2c(client, &fsa4480_regmap_config);
if (IS_ERR(fsa->regmap))
return dev_err_probe(dev, PTR_ERR(fsa->regmap), "failed to initialize regmap\n");
fsa->cur_enable = FSA4480_ENABLE_DEVICE | FSA4480_ENABLE_USB;
fsa->cur_select = FSA4480_SEL_USB;
/* set default settings */
regmap_write(fsa->regmap, FSA4480_SLOW_L, 0x00);
regmap_write(fsa->regmap, FSA4480_SLOW_R, 0x00);
regmap_write(fsa->regmap, FSA4480_SLOW_MIC, 0x00);
regmap_write(fsa->regmap, FSA4480_SLOW_SENSE, 0x00);
regmap_write(fsa->regmap, FSA4480_SLOW_GND, 0x00);
regmap_write(fsa->regmap, FSA4480_DELAY_L_R, 0x00);
regmap_write(fsa->regmap, FSA4480_DELAY_L_MIC, 0x00);
regmap_write(fsa->regmap, FSA4480_DELAY_L_SENSE, 0x00);
regmap_write(fsa->regmap, FSA4480_DELAY_L_AGND, 0x09);
regmap_write(fsa->regmap, FSA4480_SWITCH_SELECT, fsa->cur_select);
regmap_write(fsa->regmap, FSA4480_SWITCH_ENABLE, fsa->cur_enable);
sw_desc.drvdata = fsa;
sw_desc.fwnode = dev_fwnode(dev);
sw_desc.set = fsa4480_switch_set;
fsa->sw = typec_switch_register(dev, &sw_desc);
if (IS_ERR(fsa->sw))
return dev_err_probe(dev, PTR_ERR(fsa->sw), "failed to register typec switch\n");
mux_desc.drvdata = fsa;
mux_desc.fwnode = dev_fwnode(dev);
mux_desc.set = fsa4480_mux_set;
fsa->mux = typec_mux_register(dev, &mux_desc);
if (IS_ERR(fsa->mux)) {
typec_switch_unregister(fsa->sw);
return dev_err_probe(dev, PTR_ERR(fsa->mux), "failed to register typec mux\n");
}
i2c_set_clientdata(client, fsa);
return 0;
}
static void fsa4480_remove(struct i2c_client *client)
{
struct fsa4480 *fsa = i2c_get_clientdata(client);
typec_mux_unregister(fsa->mux);
typec_switch_unregister(fsa->sw);
}
static const struct i2c_device_id fsa4480_table[] = {
{ "fsa4480" },
{ }
};
MODULE_DEVICE_TABLE(i2c, fsa4480_table);
static const struct of_device_id fsa4480_of_table[] = {
{ .compatible = "fcs,fsa4480" },
{ }
};
MODULE_DEVICE_TABLE(of, fsa4480_of_table);
static struct i2c_driver fsa4480_driver = {
.driver = {
.name = "fsa4480",
.of_match_table = fsa4480_of_table,
},
.probe_new = fsa4480_probe,
.remove = fsa4480_remove,
.id_table = fsa4480_table,
};
module_i2c_driver(fsa4480_driver);
MODULE_DESCRIPTION("ON Semiconductor FSA4480 driver");
MODULE_LICENSE("GPL v2");
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