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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2012 Jan Luebbe, Pengutronix
*/
#include <common.h>
#include <init.h>
#include <driver.h>
#include <spi/spi.h>
#include <errno.h>
#define REG_ID0 0x00
#define REG_ID1 0x01
#define REG_GC00 0x02
#define REG_GC01 0x03
#define REG_GC02 0x04
#define REG_GC03 0x05
#define REG_GC04 0x06
#define REG_GC05 0x07
#define REG_GC06 0x08
#define REG_GC07 0x09
#define REG_GC08 0x0a
#define REG_GC09 0x0b
#define REG_GC10 0x0c
#define REG_GC11 0x0d
#define REG_PSTAT1(p) (0x10 * p + 0xe)
#define REG_PSTAT2(p) (0x10 * p + 0xf)
#define CMD_WRITE 0x02
#define CMD_READ 0x03
enum ksz_type {
unknown,
ksz87,
ksz88
};
struct micrel_switch_priv {
struct cdev cdev;
struct spi_device *spi;
unsigned int p_enable;
unsigned int addr_width;
unsigned int pad;
};
static int micrel_switch_read_reg(const struct micrel_switch_priv *priv, uint8_t reg)
{
uint8_t tx[2];
uint8_t rx[1];
int ret;
tx[0] = CMD_READ << (priv->addr_width + priv->pad - 8) | reg >> (8 - priv->pad);
tx[1] = reg << priv->pad;
ret = spi_write_then_read(priv->spi, tx, 2, rx, 1);
if (ret < 0)
return ret;
return rx[0];
}
static void micrel_switch_write_reg(const struct micrel_switch_priv *priv, uint8_t reg, uint8_t val)
{
uint8_t tx[3];
tx[0] = CMD_WRITE << (priv->addr_width + priv->pad - 8) | reg >> (8 - priv->pad);
tx[1] = reg << priv->pad;
tx[2] = val;
spi_write_then_read(priv->spi, tx, 3, NULL, 0);
}
static int micrel_switch_enable_set(struct param_d *param, void *_priv)
{
struct micrel_switch_priv *priv = _priv;
if (priv->p_enable)
micrel_switch_write_reg(priv, REG_ID1, 1);
else
micrel_switch_write_reg(priv, REG_ID1, 0);
return 0;
}
static ssize_t micel_switch_read(struct cdev *cdev, void *_buf, size_t count, loff_t offset, ulong flags)
{
int i, ret;
uint8_t *buf = _buf;
struct micrel_switch_priv *priv = cdev->priv;
for (i = 0; i < count; i++) {
ret = micrel_switch_read_reg(priv, offset);
if (ret < 0)
return ret;
*buf = ret;
buf++;
offset++;
}
return count;
}
static ssize_t micel_switch_write(struct cdev *cdev, const void *_buf, size_t count, loff_t offset, ulong flags)
{
int i;
const uint8_t *buf = _buf;
struct micrel_switch_priv *priv = cdev->priv;
for (i = 0; i < count; i++) {
micrel_switch_write_reg(priv, offset, *buf);
buf++;
offset++;
}
return count;
}
static struct cdev_operations micrel_switch_ops = {
.read = micel_switch_read,
.write = micel_switch_write,
};
static int micrel_switch_probe(struct device *dev)
{
struct micrel_switch_priv *priv;
int ret = 0;
enum ksz_type kind = (enum ksz_type)device_get_match_data(dev);
uint8_t id;
if (kind == unknown)
return -ENODEV;
priv = xzalloc(sizeof(*priv));
dev->priv = priv;
priv->spi = (struct spi_device *)dev->type_data;
priv->spi->mode = SPI_MODE_0;
priv->spi->bits_per_word = 8;
switch (kind) {
case ksz87:
priv->addr_width = 12;
priv->pad = 1;
id = 0x87;
break;
case ksz88:
priv->addr_width = 8;
priv->pad = 0;
id = 0x95;
break;
default:
return -ENODEV;
};
ret = micrel_switch_read_reg(priv, REG_ID0);
if (ret < 0) {
dev_err(&priv->spi->dev, "failed to read device id\n");
return ret;
}
if (ret != id) {
dev_err(&priv->spi->dev, "unknown device id: %02x\n", ret);
return -ENODEV;
}
priv->cdev.name = basprintf("switch%d", dev->id);
priv->cdev.size = 256;
priv->cdev.ops = &micrel_switch_ops;
priv->cdev.priv = priv;
priv->cdev.dev = dev;
devfs_create(&priv->cdev);
dev_add_param_bool(dev, "enable", micrel_switch_enable_set,
NULL, &priv->p_enable, priv);
priv->p_enable = 1;
micrel_switch_write_reg(priv, REG_ID1, 1);
return 0;
}
static const struct platform_device_id ksz_ids[] = {
{ .name = "ksz8864rmn", .driver_data = ksz88 },
{ .name = "ksz8795", .driver_data = ksz87 },
{ }
};
static struct driver micrel_switch_driver = {
.name = "ksz8864rmn",
.probe = micrel_switch_probe,
.id_table = ksz_ids,
};
device_spi_driver(micrel_switch_driver);
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