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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020 NovaTech LLC
* George McCollister <george.mccollister@gmail.com>
*/
#include <linux/bits.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include "xrs700x.h"
#include "xrs700x_reg.h"
struct xrs700x_i2c_cmd {
__be32 reg;
__be16 val;
} __packed;
static int xrs700x_i2c_reg_read(void *context, unsigned int reg,
unsigned int *val)
{
struct device *dev = context;
struct i2c_client *i2c = to_i2c_client(dev);
struct xrs700x_i2c_cmd cmd;
int ret;
cmd.reg = cpu_to_be32(reg | 1);
ret = i2c_master_send(i2c, (char *)&cmd.reg, sizeof(cmd.reg));
if (ret < 0) {
dev_err(dev, "xrs i2c_master_send returned %d\n", ret);
return ret;
}
ret = i2c_master_recv(i2c, (char *)&cmd.val, sizeof(cmd.val));
if (ret < 0) {
dev_err(dev, "xrs i2c_master_recv returned %d\n", ret);
return ret;
}
*val = be16_to_cpu(cmd.val);
return 0;
}
static int xrs700x_i2c_reg_write(void *context, unsigned int reg,
unsigned int val)
{
struct device *dev = context;
struct i2c_client *i2c = to_i2c_client(dev);
struct xrs700x_i2c_cmd cmd;
int ret;
cmd.reg = cpu_to_be32(reg);
cmd.val = cpu_to_be16(val);
ret = i2c_master_send(i2c, (char *)&cmd, sizeof(cmd));
if (ret < 0) {
dev_err(dev, "xrs i2c_master_send returned %d\n", ret);
return ret;
}
return 0;
}
static const struct regmap_config xrs700x_i2c_regmap_config = {
.val_bits = 16,
.reg_stride = 2,
.reg_bits = 32,
.pad_bits = 0,
.write_flag_mask = 0,
.read_flag_mask = 0,
.reg_read = xrs700x_i2c_reg_read,
.reg_write = xrs700x_i2c_reg_write,
.max_register = 0,
.cache_type = REGCACHE_NONE,
.reg_format_endian = REGMAP_ENDIAN_BIG,
.val_format_endian = REGMAP_ENDIAN_BIG
};
static int xrs700x_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *i2c_id)
{
struct xrs700x *priv;
int ret;
priv = xrs700x_switch_alloc(&i2c->dev, i2c);
if (!priv)
return -ENOMEM;
priv->regmap = devm_regmap_init(&i2c->dev, NULL, &i2c->dev,
&xrs700x_i2c_regmap_config);
if (IS_ERR(priv->regmap)) {
ret = PTR_ERR(priv->regmap);
dev_err(&i2c->dev, "Failed to initialize regmap: %d\n", ret);
return ret;
}
i2c_set_clientdata(i2c, priv);
ret = xrs700x_switch_register(priv);
/* Main DSA driver may not be started yet. */
if (ret)
return ret;
return 0;
}
static int xrs700x_i2c_remove(struct i2c_client *i2c)
{
struct xrs700x *priv = i2c_get_clientdata(i2c);
if (!priv)
return 0;
xrs700x_switch_remove(priv);
i2c_set_clientdata(i2c, NULL);
return 0;
}
static void xrs700x_i2c_shutdown(struct i2c_client *i2c)
{
struct xrs700x *priv = i2c_get_clientdata(i2c);
if (!priv)
return;
xrs700x_switch_shutdown(priv);
i2c_set_clientdata(i2c, NULL);
}
static const struct i2c_device_id xrs700x_i2c_id[] = {
{ "xrs700x-switch", 0 },
{},
};
MODULE_DEVICE_TABLE(i2c, xrs700x_i2c_id);
static const struct of_device_id __maybe_unused xrs700x_i2c_dt_ids[] = {
{ .compatible = "arrow,xrs7003e", .data = &xrs7003e_info },
{ .compatible = "arrow,xrs7003f", .data = &xrs7003f_info },
{ .compatible = "arrow,xrs7004e", .data = &xrs7004e_info },
{ .compatible = "arrow,xrs7004f", .data = &xrs7004f_info },
{},
};
MODULE_DEVICE_TABLE(of, xrs700x_i2c_dt_ids);
static struct i2c_driver xrs700x_i2c_driver = {
.driver = {
.name = "xrs700x-i2c",
.of_match_table = of_match_ptr(xrs700x_i2c_dt_ids),
},
.probe = xrs700x_i2c_probe,
.remove = xrs700x_i2c_remove,
.shutdown = xrs700x_i2c_shutdown,
.id_table = xrs700x_i2c_id,
};
module_i2c_driver(xrs700x_i2c_driver);
MODULE_AUTHOR("George McCollister <george.mccollister@gmail.com>");
MODULE_DESCRIPTION("Arrow SpeedChips XRS700x DSA I2C driver");
MODULE_LICENSE("GPL v2");
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