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i2c: i2c-mux-gpio: update mux with gpiod_set_array_value_cansleep 

If the gpio controller supports it and the gpio lines are concentrated
to one gpio chip, the mux controller pins will get updated simultaneously.

Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Peter Rosin 2016-11-24 19:19:28 +01:00 committed by Wolfram Sang
parent bbf9d262a1
commit feff5c0a27
1 changed files with 14 additions and 4 deletions
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18
drivers/i2c/muxes/i2c-mux-gpio.c
View File

@ -21,6 +21,8 @@
struct gpiomux {
struct i2c_mux_gpio_platform_data data;
unsigned gpio_base;
struct gpio_desc **gpios;
int *values;
};
static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
@ -28,8 +30,10 @@ static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
int i;
for (i = 0; i < mux->data.n_gpios; i++)
gpio_set_value_cansleep(mux->gpio_base + mux->data.gpios[i],
val & (1 << i));
mux->values[i] = (val >> i) & 1;
gpiod_set_array_value_cansleep(mux->data.n_gpios,
mux->gpios, mux->values);
}
static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
@ -176,12 +180,16 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
if (!parent)
return -EPROBE_DEFER;
muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values, 0, 0,
muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values,
mux->data.n_gpios * sizeof(*mux->gpios) +
mux->data.n_gpios * sizeof(*mux->values), 0,
i2c_mux_gpio_select, NULL);
if (!muxc) {
ret = -ENOMEM;
goto alloc_failed;
}
mux->gpios = muxc->priv;
mux->values = (int *)(mux->gpios + mux->data.n_gpios);
muxc->priv = mux;
platform_set_drvdata(pdev, muxc);
@ -219,10 +227,12 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
goto err_request_gpio;
}
gpio_desc = gpio_to_desc(gpio_base + mux->data.gpios[i]);
mux->gpios[i] = gpio_desc;
if (!muxc->mux_locked)
continue;
gpio_desc = gpio_to_desc(gpio_base + mux->data.gpios[i]);
gpio_dev = &gpio_desc->gdev->dev;
muxc->mux_locked = i2c_root_adapter(gpio_dev) == root;
}