[PATCH v7 03/24] i2c: i2c-mux-pinctrl: convert to use an explicit i2c mux core

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

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-pinctrl.c | 83 ++++++++++++++-----------------------
1 file changed, 30 insertions(+), 53 deletions(-)

diff --git a/drivers/i2c/muxes/i2c-mux-pinctrl.c b/drivers/i2c/muxes/i2c-mux-pinctrl.c
index b5a982ba8898..1b8dc711815e 100644
--- a/drivers/i2c/muxes/i2c-mux-pinctrl.c
+++ b/drivers/i2c/muxes/i2c-mux-pinctrl.c
@@ -26,34 +26,29 @@
#include <linux/of.h>

struct i2c_mux_pinctrl {
- struct device *dev;
struct i2c_mux_pinctrl_platform_data *pdata;
struct pinctrl *pinctrl;
struct pinctrl_state **states;
struct pinctrl_state *state_idle;
- struct i2c_adapter *parent;
- struct i2c_adapter **busses;
};

-static int i2c_mux_pinctrl_select(struct i2c_adapter *adap, void *data,
- u32 chan)
+static int i2c_mux_pinctrl_select(struct i2c_mux_core *muxc, u32 chan)
{
- struct i2c_mux_pinctrl *mux = data;
+ struct i2c_mux_pinctrl *mux = i2c_mux_priv(muxc);

return pinctrl_select_state(mux->pinctrl, mux->states[chan]);
}

-static int i2c_mux_pinctrl_deselect(struct i2c_adapter *adap, void *data,
- u32 chan)
+static int i2c_mux_pinctrl_deselect(struct i2c_mux_core *muxc, u32 chan)
{
- struct i2c_mux_pinctrl *mux = data;
+ struct i2c_mux_pinctrl *mux = i2c_mux_priv(muxc);

return pinctrl_select_state(mux->pinctrl, mux->state_idle);
}

#ifdef CONFIG_OF
static int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux,
- struct platform_device *pdev)
+ struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
int num_names, i, ret;
@@ -64,15 +59,12 @@ static int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux,
return 0;

mux->pdata = devm_kzalloc(&pdev->dev, sizeof(*mux->pdata), GFP_KERNEL);
- if (!mux->pdata) {
- dev_err(mux->dev,
- "Cannot allocate i2c_mux_pinctrl_platform_data\n");
+ if (!mux->pdata)
return -ENOMEM;
- }

num_names = of_property_count_strings(np, "pinctrl-names");
if (num_names < 0) {
- dev_err(mux->dev, "Cannot parse pinctrl-names: %d\n",
+ dev_err(&pdev->dev, "Cannot parse pinctrl-names: %d\n",
num_names);
return num_names;
}
@@ -80,23 +72,22 @@ static int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux,
mux->pdata->pinctrl_states = devm_kzalloc(&pdev->dev,
sizeof(*mux->pdata->pinctrl_states) * num_names,
GFP_KERNEL);
- if (!mux->pdata->pinctrl_states) {
- dev_err(mux->dev, "Cannot allocate pinctrl_states\n");
+ if (!mux->pdata->pinctrl_states)
return -ENOMEM;
- }

for (i = 0; i < num_names; i++) {
ret = of_property_read_string_index(np, "pinctrl-names", i,
&mux->pdata->pinctrl_states[mux->pdata->bus_count]);
if (ret < 0) {
- dev_err(mux->dev, "Cannot parse pinctrl-names: %d\n",
+ dev_err(&pdev->dev, "Cannot parse pinctrl-names: %d\n",
ret);
return ret;
}
if (!strcmp(mux->pdata->pinctrl_states[mux->pdata->bus_count],
"idle")) {
if (i != num_names - 1) {
- dev_err(mux->dev, "idle state must be last\n");
+ dev_err(&pdev->dev,
+ "idle state must be last\n");
return -EINVAL;
}
mux->pdata->pinctrl_state_idle = "idle";
@@ -107,13 +98,13 @@ static int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux,

adapter_np = of_parse_phandle(np, "i2c-parent", 0);
if (!adapter_np) {
- dev_err(mux->dev, "Cannot parse i2c-parent\n");
+ dev_err(&pdev->dev, "Cannot parse i2c-parent\n");
return -ENODEV;
}
adapter = of_find_i2c_adapter_by_node(adapter_np);
of_node_put(adapter_np);
if (!adapter) {
- dev_err(mux->dev, "Cannot find parent bus\n");
+ dev_err(&pdev->dev, "Cannot find parent bus\n");
return -EPROBE_DEFER;
}
mux->pdata->parent_bus_num = i2c_adapter_id(adapter);
@@ -131,19 +122,15 @@ static inline int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux,

static int i2c_mux_pinctrl_probe(struct platform_device *pdev)
{
+ struct i2c_mux_core *muxc;
struct i2c_mux_pinctrl *mux;
- int (*deselect)(struct i2c_adapter *, void *, u32);
int i, ret;

mux = devm_kzalloc(&pdev->dev, sizeof(*mux), GFP_KERNEL);
if (!mux) {
- dev_err(&pdev->dev, "Cannot allocate i2c_mux_pinctrl\n");
ret = -ENOMEM;
goto err;
}
- platform_set_drvdata(pdev, mux);
-
- mux->dev = &pdev->dev;

mux->pdata = dev_get_platdata(&pdev->dev);
if (!mux->pdata) {
@@ -166,14 +153,15 @@ static int i2c_mux_pinctrl_probe(struct platform_device *pdev)
goto err;
}

- mux->busses = devm_kzalloc(&pdev->dev,
- sizeof(*mux->busses) * mux->pdata->bus_count,
- GFP_KERNEL);
- if (!mux->busses) {
- dev_err(&pdev->dev, "Cannot allocate busses\n");
+ muxc = i2c_mux_alloc(NULL, &pdev->dev, mux->pdata->bus_count, 0, 0,
+ i2c_mux_pinctrl_select, NULL);
+ if (!muxc) {
ret = -ENOMEM;
goto err;
}
+ muxc->priv = mux;
+
+ platform_set_drvdata(pdev, muxc);

mux->pinctrl = devm_pinctrl_get(&pdev->dev);
if (IS_ERR(mux->pinctrl)) {
@@ -203,13 +191,11 @@ static int i2c_mux_pinctrl_probe(struct platform_device *pdev)
goto err;
}

- deselect = i2c_mux_pinctrl_deselect;
- } else {
- deselect = NULL;
+ muxc->deselect = i2c_mux_pinctrl_deselect;
}

- mux->parent = i2c_get_adapter(mux->pdata->parent_bus_num);
- if (!mux->parent) {
+ muxc->parent = i2c_get_adapter(mux->pdata->parent_bus_num);
+ if (!muxc->parent) {
dev_err(&pdev->dev, "Parent adapter (%d) not found\n",
mux->pdata->parent_bus_num);
ret = -EPROBE_DEFER;
@@ -220,12 +206,8 @@ static int i2c_mux_pinctrl_probe(struct platform_device *pdev)
u32 bus = mux->pdata->base_bus_num ?
(mux->pdata->base_bus_num + i) : 0;

- mux->busses[i] = i2c_add_mux_adapter(mux->parent, &pdev->dev,
- mux, bus, i, 0,
- i2c_mux_pinctrl_select,
- deselect);
- if (!mux->busses[i]) {
- ret = -ENODEV;
+ ret = i2c_mux_add_adapter(muxc, bus, i, 0);
+ if (ret) {
dev_err(&pdev->dev, "Failed to add adapter %d\n", i);
goto err_del_adapter;
}
@@ -234,23 +216,18 @@ static int i2c_mux_pinctrl_probe(struct platform_device *pdev)
return 0;

err_del_adapter:
- for (; i > 0; i--)
- i2c_del_mux_adapter(mux->busses[i - 1]);
- i2c_put_adapter(mux->parent);
+ i2c_mux_del_adapters(muxc);
+ i2c_put_adapter(muxc->parent);
err:
return ret;
}

static int i2c_mux_pinctrl_remove(struct platform_device *pdev)
{
- struct i2c_mux_pinctrl *mux = platform_get_drvdata(pdev);
- int i;
-
- for (i = 0; i < mux->pdata->bus_count; i++)
- i2c_del_mux_adapter(mux->busses[i]);
-
- i2c_put_adapter(mux->parent);
+ struct i2c_mux_core *muxc = platform_get_drvdata(pdev);

+ i2c_mux_del_adapters(muxc);
+ i2c_put_adapter(muxc->parent);
return 0;
}

--
2.1.4