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i2c: mux: mlxcpld: Extend driver to support word address space devices

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Extend driver to allow I2C routing control through CPLD devices with
word address space. Till now only CPLD devices with byte address space
have been supported.

Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Reviewed-by: Michael Shych <michaelsh@nvidia.com>
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Vadim Pasternak 2021-02-08 22:16:04 +02:00 committed by Wolfram Sang
parent cae5216387
commit c52a1c5f5d
2 changed files with 40 additions and 7 deletions
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45
drivers/i2c/muxes/i2c-mux-mlxcpld.c
View file

@ -63,19 +63,39 @@ static int mlxcpld_mux_reg_write(struct i2c_adapter *adap,
struct mlxcpld_mux *mux, u32 val)
{
struct i2c_client *client = mux->client;
union i2c_smbus_data data = { .byte = val };
union i2c_smbus_data data;
struct i2c_msg msg;
u8 buf[3];
return __i2c_smbus_xfer(adap, client->addr, client->flags,
I2C_SMBUS_WRITE, mux->pdata.sel_reg_addr,
I2C_SMBUS_BYTE_DATA, &data);
switch (mux->pdata.reg_size) {
case 1:
data.byte = val;
return __i2c_smbus_xfer(adap, client->addr, client->flags,
I2C_SMBUS_WRITE, mux->pdata.sel_reg_addr,
I2C_SMBUS_BYTE_DATA, &data);
case 2:
buf[0] = mux->pdata.sel_reg_addr >> 8;
buf[1] = mux->pdata.sel_reg_addr;
buf[2] = val;
msg.addr = client->addr;
msg.buf = buf;
msg.len = mux->pdata.reg_size + 1;
msg.flags = 0;
return __i2c_transfer(adap, &msg, 1);
default:
return -EINVAL;
}
}
static int mlxcpld_mux_select_chan(struct i2c_mux_core *muxc, u32 chan)
{
struct mlxcpld_mux *mux = i2c_mux_priv(muxc);
u32 regval = chan + 1;
u32 regval = chan;
int err = 0;
if (mux->pdata.reg_size == 1)
regval += 1;
/* Only select the channel if its different from the last channel */
if (mux->last_val != regval) {
err = mlxcpld_mux_reg_write(muxc->parent, mux, regval);
@ -103,12 +123,23 @@ static int mlxcpld_mux_probe(struct platform_device *pdev)
struct i2c_mux_core *muxc;
struct mlxcpld_mux *data;
int num, err;
u32 func;
if (!pdata)
return -EINVAL;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
switch (pdata->reg_size) {
case 1:
func = I2C_FUNC_SMBUS_WRITE_BYTE_DATA;
break;
case 2:
func = I2C_FUNC_I2C;
break;
default:
return -EINVAL;
}
if (!i2c_check_functionality(client->adapter, func))
return -ENODEV;
muxc = i2c_mux_alloc(client->adapter, &pdev->dev, CPLD_MUX_MAX_NCHANS,

2
include/linux/platform_data/mlxcpld.h
View file

@ -14,11 +14,13 @@
* @chan_ids - channels array
* @num_adaps - number of adapters
* @sel_reg_addr - mux select register offset in CPLD space
* @reg_size: register size in bytes
*/
struct mlxcpld_mux_plat_data {
int *chan_ids;
int num_adaps;
int sel_reg_addr;
u8 reg_size;
};
#endif /* _LINUX_I2C_MLXCPLD_H */