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>

diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index e5cf26e..655684d 100644 (file)
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -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;
        }