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Subject[PATCH v2 2/3] i2c-mux-gpio: Unpin the platform-specific GPIOs request code
Date
The GPIOs request loop can be safely moved to a separate function.
First of all it shall improve the code readability. Secondly the
initialization loop at this point is used for both of- and
platform_data-based initialization paths, but it will be changed in
the next patch, so by isolating the code we'll simplify the future
work.

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>

---
Changelog v2
- Create a dedicated initial_state field in the "gpiomux" structure to
keep an initial channel selector state.
---
drivers/i2c/muxes/i2c-mux-gpio.c | 113 +++++++++++++++++++------------
1 file changed, 68 insertions(+), 45 deletions(-)

diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index 54158b825acd..e10f72706b99 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -20,7 +20,8 @@

struct gpiomux {
struct i2c_mux_gpio_platform_data data;
- unsigned gpio_base;
+ unsigned int gpio_base;
+ unsigned int initial_state;
struct gpio_desc **gpios;
};

@@ -162,13 +163,68 @@ static int i2c_mux_gpio_probe_plat(struct gpiomux *mux,
return 0;
}

+static int i2c_mux_gpio_request_plat(struct gpiomux *mux,
+ struct platform_device *pdev)
+{
+ struct i2c_mux_core *muxc = platform_get_drvdata(pdev);
+ struct gpio_desc *gpio_desc;
+ struct i2c_adapter *root;
+ struct device *gpio_dev;
+ int i, ret;
+
+ root = i2c_root_adapter(&muxc->parent->dev);
+
+ for (i = 0; i < mux->data.n_gpios; i++) {
+ ret = gpio_request(mux->gpio_base + mux->data.gpios[i],
+ "i2c-mux-gpio");
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request GPIO %d\n",
+ mux->data.gpios[i]);
+ goto err_request_gpio;
+ }
+
+ ret = gpio_direction_output(mux->gpio_base + mux->data.gpios[i],
+ mux->initial_state & (1 << i));
+ if (ret) {
+ dev_err(&pdev->dev,
+ "Failed to set direction of GPIO %d to output\n",
+ mux->data.gpios[i]);
+ i++; /* gpio_request above succeeded, so must free */
+ goto err_request_gpio;
+ }
+
+ gpio_desc = gpio_to_desc(mux->gpio_base + mux->data.gpios[i]);
+ mux->gpios[i] = gpio_desc;
+
+ if (!muxc->mux_locked)
+ continue;
+
+ gpio_dev = &gpio_desc->gdev->dev;
+ muxc->mux_locked = i2c_root_adapter(gpio_dev) == root;
+ }
+
+ return 0;
+
+err_request_gpio:
+ for (; i > 0; i--)
+ gpio_free(mux->gpio_base + mux->data.gpios[i - 1]);
+
+ return ret;
+}
+
+static void i2c_mux_gpio_free(struct gpiomux *mux)
+{
+ int i;
+
+ for (i = 0; i < mux->data.n_gpios; i++)
+ gpiod_free(mux->gpios[i]);
+}
+
static int i2c_mux_gpio_probe(struct platform_device *pdev)
{
struct i2c_mux_core *muxc;
struct gpiomux *mux;
struct i2c_adapter *parent;
- struct i2c_adapter *root;
- unsigned initial_state;
int i, ret;

mux = devm_kzalloc(&pdev->dev, sizeof(*mux), GFP_KERNEL);
@@ -198,48 +254,18 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)

platform_set_drvdata(pdev, muxc);

- root = i2c_root_adapter(&parent->dev);
-
muxc->mux_locked = true;

if (mux->data.idle != I2C_MUX_GPIO_NO_IDLE) {
- initial_state = mux->data.idle;
+ mux->initial_state = mux->data.idle;
muxc->deselect = i2c_mux_gpio_deselect;
} else {
- initial_state = mux->data.values[0];
+ mux->initial_state = mux->data.values[0];
}

- for (i = 0; i < mux->data.n_gpios; i++) {
- struct device *gpio_dev;
- struct gpio_desc *gpio_desc;
-
- ret = gpio_request(mux->gpio_base + mux->data.gpios[i],
- "i2c-mux-gpio");
- if (ret) {
- dev_err(&pdev->dev, "Failed to request GPIO %d\n",
- mux->data.gpios[i]);
- goto err_request_gpio;
- }
-
- ret = gpio_direction_output(mux->gpio_base + mux->data.gpios[i],
- initial_state & (1 << i));
- if (ret) {
- dev_err(&pdev->dev,
- "Failed to set direction of GPIO %d to output\n",
- mux->data.gpios[i]);
- i++; /* gpio_request above succeeded, so must free */
- goto err_request_gpio;
- }
-
- gpio_desc = gpio_to_desc(mux->gpio_base + mux->data.gpios[i]);
- mux->gpios[i] = gpio_desc;
-
- if (!muxc->mux_locked)
- continue;
-
- gpio_dev = &gpio_desc->gdev->dev;
- muxc->mux_locked = i2c_root_adapter(gpio_dev) == root;
- }
+ ret = i2c_mux_gpio_request_plat(mux, pdev);
+ if (ret)
+ goto alloc_failed;

if (muxc->mux_locked)
dev_info(&pdev->dev, "mux-locked i2c mux\n");
@@ -260,10 +286,9 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)

add_adapter_failed:
i2c_mux_del_adapters(muxc);
- i = mux->data.n_gpios;
-err_request_gpio:
- for (; i > 0; i--)
- gpio_free(mux->gpio_base + mux->data.gpios[i - 1]);
+
+ i2c_mux_gpio_free(mux);
+
alloc_failed:
i2c_put_adapter(parent);

@@ -274,12 +299,10 @@ static int i2c_mux_gpio_remove(struct platform_device *pdev)
{
struct i2c_mux_core *muxc = platform_get_drvdata(pdev);
struct gpiomux *mux = i2c_mux_priv(muxc);
- int i;

i2c_mux_del_adapters(muxc);

- for (i = 0; i < mux->data.n_gpios; i++)
- gpio_free(mux->gpio_base + mux->data.gpios[i]);
+ i2c_mux_gpio_free(mux);

i2c_put_adapter(muxc->parent);

--
2.21.0
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