forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
147 lines
3.3 KiB
147 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* Copyright (C) 2020 NovaTech LLC |
|
* George McCollister <[email protected]> |
|
*/ |
|
|
|
#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); |
|
|
|
xrs700x_switch_remove(priv); |
|
|
|
return 0; |
|
} |
|
|
|
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, |
|
.id_table = xrs700x_i2c_id, |
|
}; |
|
|
|
module_i2c_driver(xrs700x_i2c_driver); |
|
|
|
MODULE_AUTHOR("George McCollister <[email protected]>"); |
|
MODULE_DESCRIPTION("Arrow SpeedChips XRS700x DSA I2C driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|