Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 7fcac980 authored by Peter Rosin's avatar Peter Rosin Committed by Wolfram Sang
Browse files

i2c: i2c-mux-pca954x: convert to use an explicit i2c mux core 



Allocate an explicit i2c mux core to handle parent and child adapters
etc. Update the select/deselect ops to be in terms of the i2c mux core
instead of the child adapter.

Add a mask to handle the case where not all child adapters should
cause a mux deselect to happen, now that there is a common deselect op
for all child adapters.

Signed-off-by: default avatarPeter Rosin <peda@axentia.se>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent ab88b97c

drivers/i2c/muxes/i2c-mux-pca954x.c

+30 −31
Original line number Diff line number Diff line
@@ -60,9 +60,10 @@ enum pca_type { 


struct pca954x {

	enum pca_type type;

	struct i2c_adapter *virt_adaps[PCA954X_MAX_NCHANS];



	u8 last_chan;		/* last register value */

	u8 deselect;

	struct i2c_client *client;

};



struct chip_desc {
@@ -146,10 +147,10 @@ static int pca954x_reg_write(struct i2c_adapter *adap, 
	return ret;

}



static int pca954x_select_chan(struct i2c_adapter *adap,

			       void *client, u32 chan)

static int pca954x_select_chan(struct i2c_mux_core *muxc, u32 chan)

{

	struct pca954x *data = i2c_get_clientdata(client);

	struct pca954x *data = i2c_mux_priv(muxc);

	struct i2c_client *client = data->client;

	const struct chip_desc *chip = &chips[data->type];

	u8 regval;

	int ret = 0;
@@ -162,21 +163,24 @@ static int pca954x_select_chan(struct i2c_adapter *adap, 


	/* Only select the channel if its different from the last channel */

	if (data->last_chan != regval) {

		ret = pca954x_reg_write(adap, client, regval);

		ret = pca954x_reg_write(muxc->parent, client, regval);

		data->last_chan = regval;

	}



	return ret;

}



static int pca954x_deselect_mux(struct i2c_adapter *adap,

				void *client, u32 chan)

static int pca954x_deselect_mux(struct i2c_mux_core *muxc, u32 chan)

{

	struct pca954x *data = i2c_get_clientdata(client);

	struct pca954x *data = i2c_mux_priv(muxc);

	struct i2c_client *client = data->client;



	if (!(data->deselect & (1 << chan)))

		return 0;



	/* Deselect active channel */

	data->last_chan = 0;

	return pca954x_reg_write(adap, client, data->last_chan);

	return pca954x_reg_write(muxc->parent, client, data->last_chan);

}



/*
@@ -191,17 +195,22 @@ static int pca954x_probe(struct i2c_client *client, 
	bool idle_disconnect_dt;

	struct gpio_desc *gpio;

	int num, force, class;

	struct i2c_mux_core *muxc;

	struct pca954x *data;

	int ret;



	if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_BYTE))

		return -ENODEV;



	data = devm_kzalloc(&client->dev, sizeof(struct pca954x), GFP_KERNEL);

	if (!data)

	muxc = i2c_mux_alloc(adap, &client->dev,

			     PCA954X_MAX_NCHANS, sizeof(*data), 0,

			     pca954x_select_chan, pca954x_deselect_mux);

	if (!muxc)

		return -ENOMEM;

	data = i2c_mux_priv(muxc);



	i2c_set_clientdata(client, data);

	i2c_set_clientdata(client, muxc);

	data->client = client;



	/* Get the mux out of reset if a reset GPIO is specified. */

	gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_LOW);
@@ -238,16 +247,13 @@ static int pca954x_probe(struct i2c_client *client, 
				/* discard unconfigured channels */

				break;

			idle_disconnect_pd = pdata->modes[num].deselect_on_exit;

			data->deselect |= (idle_disconnect_pd

					   || idle_disconnect_dt) << num;

		}



		data->virt_adaps[num] =

			i2c_add_mux_adapter(adap, &client->dev, client,

				force, num, class, pca954x_select_chan,

				(idle_disconnect_pd || idle_disconnect_dt)

					? pca954x_deselect_mux : NULL);

		ret = i2c_mux_add_adapter(muxc, force, num, class);



		if (data->virt_adaps[num] == NULL) {

			ret = -ENODEV;

		if (ret) {

			dev_err(&client->dev,

				"failed to register multiplexed adapter"

				" %d as bus %d\n", num, force);
@@ -263,23 +269,15 @@ static int pca954x_probe(struct i2c_client *client, 
	return 0;



virt_reg_failed:

	for (num--; num >= 0; num--)

		i2c_del_mux_adapter(data->virt_adaps[num]);

	i2c_mux_del_adapters(muxc);

	return ret;

}



static int pca954x_remove(struct i2c_client *client)

{

	struct pca954x *data = i2c_get_clientdata(client);

	const struct chip_desc *chip = &chips[data->type];

	int i;



	for (i = 0; i < chip->nchans; ++i)

		if (data->virt_adaps[i]) {

			i2c_del_mux_adapter(data->virt_adaps[i]);

			data->virt_adaps[i] = NULL;

		}

	struct i2c_mux_core *muxc = i2c_get_clientdata(client);



	i2c_mux_del_adapters(muxc);

	return 0;

}
@@ -287,7 +285,8 @@ static int pca954x_remove(struct i2c_client *client) 
static int pca954x_resume(struct device *dev)

{

	struct i2c_client *client = to_i2c_client(dev);

	struct pca954x *data = i2c_get_clientdata(client);

	struct i2c_mux_core *muxc = i2c_get_clientdata(client);

	struct pca954x *data = i2c_mux_priv(muxc);



	data->last_chan = 0;

	return i2c_smbus_write_byte(client, 0);