GPIO: LPC32xx: Add output reading to GPO P3
The chip offers the function to detect the current state of output of the GPO
P3 pins. Useful for reading GPIO output state in Linux' GPIO API, e.g. via
sysfs.
Please note that this only reads back the currently programmed output state,
not the actual electrical level in terms of a GPI function. Finally, GPO3 is
still just an output.
Signed-off-by: Roland Stigge <stigge@antcom.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/gpio/gpio-lpc32xx.c b/drivers/gpio/gpio-lpc32xx.c
index 14a2f29..61c2d08 100644
--- a/drivers/gpio/gpio-lpc32xx.c
+++ b/drivers/gpio/gpio-lpc32xx.c
@@ -62,9 +62,11 @@
#define GPIO3_PIN_IN_SEL(x, y) (((x) >> GPIO3_PIN_IN_SHIFT(y)) & 1)
#define GPIO3_PIN5_IN_SEL(x) (((x) >> 24) & 1)
#define GPI3_PIN_IN_SEL(x, y) (((x) >> (y)) & 1)
+#define GPO3_PIN_IN_SEL(x, y) (((x) >> (y)) & 1)
struct gpio_regs {
void __iomem *inp_state;
+ void __iomem *outp_state;
void __iomem *outp_set;
void __iomem *outp_clr;
void __iomem *dir_set;
@@ -145,6 +147,7 @@
static struct gpio_regs gpio_grp_regs_p3 = {
.inp_state = LPC32XX_GPIO_P3_INP_STATE,
+ .outp_state = LPC32XX_GPIO_P3_OUTP_STATE,
.outp_set = LPC32XX_GPIO_P3_OUTP_SET,
.outp_clr = LPC32XX_GPIO_P3_OUTP_CLR,
.dir_set = LPC32XX_GPIO_P2_DIR_SET,
@@ -240,6 +243,12 @@
return GPI3_PIN_IN_SEL(__raw_readl(group->gpio_grp->inp_state), pin);
}
+static int __get_gpo_state_p3(struct lpc32xx_gpio_chip *group,
+ unsigned pin)
+{
+ return GPO3_PIN_IN_SEL(__raw_readl(group->gpio_grp->outp_state), pin);
+}
+
/*
* GENERIC_GPIO primitives.
*/
@@ -340,6 +349,13 @@
__set_gpo_level_p3(group, pin, value);
}
+static int lpc32xx_gpo_get_value(struct gpio_chip *chip, unsigned pin)
+{
+ struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
+
+ return __get_gpo_state_p3(group, pin);
+}
+
static int lpc32xx_gpio_request(struct gpio_chip *chip, unsigned pin)
{
if (pin < chip->ngpio)
@@ -427,6 +443,7 @@
.label = "gpo_p3",
.direction_output = lpc32xx_gpio_dir_out_always,
.set = lpc32xx_gpo_set_value,
+ .get = lpc32xx_gpo_get_value,
.request = lpc32xx_gpio_request,
.base = LPC32XX_GPO_P3_GRP,
.ngpio = LPC32XX_GPO_P3_MAX,
