[PATCH v7 05/24] i2c: i2c-mux-pca9541: convert to use an explicit i2c mux core

Peter Rosin
2016-04-20T15:19:34Z

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.

Signed-off-by: Peter Rosin <peda@axentia.se>
---
drivers/i2c/muxes/i2c-mux-pca9541.c | 58 +++++++++++++++++--------------------
1 file changed, 27 insertions(+), 31 deletions(-)

diff --git a/drivers/i2c/muxes/i2c-mux-pca9541.c b/drivers/i2c/muxes/i2c-mux-pca9541.c
index d0ba424adebc..3cb8af635db5 100644
--- a/drivers/i2c/muxes/i2c-mux-pca9541.c
+++ b/drivers/i2c/muxes/i2c-mux-pca9541.c
@@ -73,7 +73,7 @@
#define SELECT_DELAY_LONG 1000

struct pca9541 {
- struct i2c_adapter *mux_adap;
+ struct i2c_client *client;
unsigned long select_timeout;
unsigned long arb_timeout;
};
@@ -217,7 +217,8 @@ static const u8 pca9541_control[16] = {
*/
static int pca9541_arbitrate(struct i2c_client *client)
{
- struct pca9541 *data = i2c_get_clientdata(client);
+ struct i2c_mux_core *muxc = i2c_get_clientdata(client);
+ struct pca9541 *data = i2c_mux_priv(muxc);
int reg;

reg = pca9541_reg_read(client, PCA9541_CONTROL);
@@ -285,9 +286,10 @@ static int pca9541_arbitrate(struct i2c_client *client)
return 0;
}

-static int pca9541_select_chan(struct i2c_adapter *adap, void *client, u32 chan)
+static int pca9541_select_chan(struct i2c_mux_core *muxc, u32 chan)
{
- struct pca9541 *data = i2c_get_clientdata(client);
+ struct pca9541 *data = i2c_mux_priv(muxc);
+ struct i2c_client *client = data->client;
int ret;
unsigned long timeout = jiffies + ARB2_TIMEOUT;
/* give up after this time */
@@ -309,9 +311,11 @@ static int pca9541_select_chan(struct i2c_adapter *adap, void *client, u32 chan)
return -ETIMEDOUT;
}

-static int pca9541_release_chan(struct i2c_adapter *adap,
- void *client, u32 chan)
+static int pca9541_release_chan(struct i2c_mux_core *muxc, u32 chan)
{
+ struct pca9541 *data = i2c_mux_priv(muxc);
+ struct i2c_client *client = data->client;
+
pca9541_release_bus(client);
return 0;
}
@@ -324,20 +328,13 @@ static int pca9541_probe(struct i2c_client *client,
{
struct i2c_adapter *adap = client->adapter;
struct pca954x_platform_data *pdata = dev_get_platdata(&client->dev);
+ struct i2c_mux_core *muxc;
struct pca9541 *data;
int force;
- int ret = -ENODEV;
+ int ret;

if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_BYTE_DATA))
- goto err;
-
- data = kzalloc(sizeof(struct pca9541), GFP_KERNEL);
- if (!data) {
- ret = -ENOMEM;
- goto err;
- }
-
- i2c_set_clientdata(client, data);
+ return -ENODEV;

/*
* I2C accesses are unprotected here.
@@ -352,34 +349,33 @@ static int pca9541_probe(struct i2c_client *client,
force = 0;
if (pdata)
force = pdata->modes[0].adap_id;
- data->mux_adap = i2c_add_mux_adapter(adap, &client->dev, client,
- force, 0, 0,
- pca9541_select_chan,
- pca9541_release_chan);
+ muxc = i2c_mux_alloc(adap, &client->dev, 1, sizeof(*data), 0,
+ pca9541_select_chan, pca9541_release_chan);
+ if (!muxc)
+ return -ENOMEM;

- if (data->mux_adap == NULL) {
+ data = i2c_mux_priv(muxc);
+ data->client = client;
+
+ i2c_set_clientdata(client, muxc);
+
+ ret = i2c_mux_add_adapter(muxc, force, 0, 0);
+ if (ret) {
dev_err(&client->dev, "failed to register master selector\n");
- goto exit_free;
+ return ret;
}

dev_info(&client->dev, "registered master selector for I2C %s\n",
client->name);

return 0;
-
-exit_free:
- kfree(data);
-err:
- return ret;
}

static int pca9541_remove(struct i2c_client *client)
{
- struct pca9541 *data = i2c_get_clientdata(client);
-
- i2c_del_mux_adapter(data->mux_adap);
+ struct i2c_mux_core *muxc = i2c_get_clientdata(client);

- kfree(data);
+ i2c_mux_del_adapters(muxc);
return 0;
}

--
2.1.4