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authorVadim Pasternak <vadimp@nvidia.com>2021-02-08 22:16:02 +0200
committerWolfram Sang <wsa@kernel.org>2021-02-09 11:35:23 +0100
commit81566938083af15aec75201293cf6047bb04f4d3 (patch)
tree99eca8d7850a8dabd29bcd7788d54fd4594ba797
parent84af1b168c5015fca0761cf9cce4add31e354dce (diff)
i2c: mux: mlxcpld: Prepare mux selection infrastructure for two-byte support
Allow to program register value zero to the mux register, which is required for word address mux register space support. Change key selector type from 'unsigned short' to 'integer' in order to allow to set it to -1 on deselection. Rename key selector field from 'last_chan' to 'last_val', since this fields keeps actually selector value and not channel number. Signed-off-by: Vadim Pasternak <vadimp@nvidia.com> Acked-by: Peter Rosin <peda@axentia.se> Signed-off-by: Wolfram Sang <wsa@kernel.org>
-rw-r--r--drivers/i2c/muxes/i2c-mux-mlxcpld.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/i2c/muxes/i2c-mux-mlxcpld.c b/drivers/i2c/muxes/i2c-mux-mlxcpld.c
index b53f1479272d..113ad84cdd94 100644
--- a/drivers/i2c/muxes/i2c-mux-mlxcpld.c
+++ b/drivers/i2c/muxes/i2c-mux-mlxcpld.c
@@ -18,12 +18,12 @@
#define CPLD_MUX_MAX_NCHANS 8
/* mlxcpld_mux - mux control structure:
- * @last_chan - last register value
+ * @last_val - last selected register value or -1 if mux deselected
* @client - I2C device client
* @pdata: platform data
*/
struct mlxcpld_mux {
- u8 last_chan;
+ int last_val;
struct i2c_client *client;
struct mlxcpld_mux_plat_data pdata;
};
@@ -60,7 +60,7 @@ struct mlxcpld_mux {
* for this as they will try to lock adapter a second time.
*/
static int mlxcpld_mux_reg_write(struct i2c_adapter *adap,
- struct mlxcpld_mux *mux, u8 val)
+ struct mlxcpld_mux *mux, u32 val)
{
struct i2c_client *client = mux->client;
union i2c_smbus_data data = { .byte = val };
@@ -73,13 +73,13 @@ static int mlxcpld_mux_reg_write(struct i2c_adapter *adap,
static int mlxcpld_mux_select_chan(struct i2c_mux_core *muxc, u32 chan)
{
struct mlxcpld_mux *mux = i2c_mux_priv(muxc);
- u8 regval = chan + 1;
+ u32 regval = chan + 1;
int err = 0;
/* Only select the channel if its different from the last channel */
- if (mux->last_chan != regval) {
+ if (mux->last_val != regval) {
err = mlxcpld_mux_reg_write(muxc->parent, mux, regval);
- mux->last_chan = err < 0 ? 0 : regval;
+ mux->last_val = err < 0 ? -1 : regval;
}
return err;
@@ -90,9 +90,9 @@ static int mlxcpld_mux_deselect(struct i2c_mux_core *muxc, u32 chan)
struct mlxcpld_mux *mux = i2c_mux_priv(muxc);
/* Deselect active channel */
- mux->last_chan = 0;
+ mux->last_val = -1;
- return mlxcpld_mux_reg_write(muxc->parent, mux, mux->last_chan);
+ return mlxcpld_mux_reg_write(muxc->parent, mux, 0);
}
/* Probe/reomove functions */
@@ -122,7 +122,7 @@ static int mlxcpld_mux_probe(struct platform_device *pdev)
data = i2c_mux_priv(muxc);
data->client = client;
memcpy(&data->pdata, pdata, sizeof(*pdata));
- data->last_chan = 0; /* force the first selection */
+ data->last_val = -1; /* force the first selection */
/* Create an adapter for each channel. */
for (num = 0; num < CPLD_MUX_MAX_NCHANS; num++) {