pinctrl: qcom: add get_direction function

The get_direction callback function allows gpiolib to know the current
direction (input vs output) for a given GPIO.

This is particularly useful on ACPI systems, where the GPIOs are
configured only by firmware (typically UEFI), so the only way to
know the initial values to query the hardware directly.  Without
this function, gpiolib thinks that all GPIOs are configured for
input.

Signed-off-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index f8e9e1c2b2f6f45078aa2fe9a3356b450d60fd58..c978be5eb9ebe37a4e9df59c76791b79b47b6cfc 100644 (file)
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -422,6 +422,20 @@ static int msm_gpio_direction_output(struct gpio_chip *chip, unsigned offset, in
        return 0;
 }
 
+static int msm_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+       struct msm_pinctrl *pctrl = gpiochip_get_data(chip);
+       const struct msm_pingroup *g;
+       u32 val;
+
+       g = &pctrl->soc->groups[offset];
+
+       val = readl(pctrl->regs + g->ctl_reg);
+
+       /* 0 = output, 1 = input */
+       return val & BIT(g->oe_bit) ? 0 : 1;
+}
+
 static int msm_gpio_get(struct gpio_chip *chip, unsigned offset)
 {
        const struct msm_pingroup *g;
@@ -510,6 +524,7 @@ static void msm_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 static struct gpio_chip msm_gpio_template = {
        .direction_input  = msm_gpio_direction_input,
        .direction_output = msm_gpio_direction_output,
+       .get_direction    = msm_gpio_get_direction,
        .get              = msm_gpio_get,
        .set              = msm_gpio_set,
        .request          = gpiochip_generic_request,