sunxi: gpio: Add support for gpio pins on the AXP209 pmic

[platform/kernel/u-boot.git] / drivers / power / axp209.c

diff --git a/drivers/power/axp209.c b/drivers/power/axp209.c
index 9798e5b..3b1a6a7 100644 (file)
--- a/drivers/power/axp209.c
+++ b/drivers/power/axp209.c
@@ -18,6 +18,11 @@ enum axp209_reg {
        AXP209_LDO3_VOLTAGE = 0x29,
        AXP209_IRQ_STATUS5 = 0x4c,
        AXP209_SHUTDOWN = 0x32,
+       AXP209_GPIO0_CTRL = 0x90,
+       AXP209_GPIO1_CTRL = 0x92,
+       AXP209_GPIO2_CTRL = 0x93,
+       AXP209_GPIO_STATE = 0x94,
+       AXP209_GPIO3_CTRL = 0x95,
 };
 
 #define AXP209_POWER_STATUS_ON_BY_DC   (1 << 0)
@@ -27,6 +32,15 @@ enum axp209_reg {
 
 #define AXP209_POWEROFF                        (1 << 7)
 
+#define AXP209_GPIO_OUTPUT_LOW         0x00 /* Drive pin low */
+#define AXP209_GPIO_OUTPUT_HIGH                0x01 /* Drive pin high */
+#define AXP209_GPIO_INPUT              0x02 /* Float pin */
+
+/* GPIO3 is different from the others */
+#define AXP209_GPIO3_OUTPUT_LOW                0x00 /* Drive pin low, Output mode */
+#define AXP209_GPIO3_OUTPUT_HIGH       0x02 /* Float pin, Output mode */
+#define AXP209_GPIO3_INPUT             0x06 /* Float pin, Input mode */
+
 static int axp209_write(enum axp209_reg reg, u8 val)
 {
        return i2c_write(0x34, reg, 1, &val, 1);
@@ -165,3 +179,61 @@ int axp209_power_button(void)
 
        return v & AXP209_IRQ5_PEK_DOWN;
 }
+
+static u8 axp209_get_gpio_ctrl_reg(unsigned int pin)
+{
+       switch (pin) {
+       case 0: return AXP209_GPIO0_CTRL;
+       case 1: return AXP209_GPIO1_CTRL;
+       case 2: return AXP209_GPIO2_CTRL;
+       case 3: return AXP209_GPIO3_CTRL;
+       }
+       return 0;
+}
+
+int axp_gpio_direction_input(unsigned int pin)
+{
+       u8 reg = axp209_get_gpio_ctrl_reg(pin);
+       /* GPIO3 is "special" */
+       u8 val = (pin == 3) ? AXP209_GPIO3_INPUT : AXP209_GPIO_INPUT;
+
+       return axp209_write(reg, val);
+}
+
+int axp_gpio_direction_output(unsigned int pin, unsigned int val)
+{
+       u8 reg = axp209_get_gpio_ctrl_reg(pin);
+
+       if (val) {
+               val = (pin == 3) ? AXP209_GPIO3_OUTPUT_HIGH :
+                                  AXP209_GPIO_OUTPUT_HIGH;
+       } else {
+               val = (pin == 3) ? AXP209_GPIO3_OUTPUT_LOW :
+                                  AXP209_GPIO_OUTPUT_LOW;
+       }
+
+       return axp209_write(reg, val);
+}
+
+int axp_gpio_get_value(unsigned int pin)
+{
+       u8 val, mask;
+       int rc;
+
+       if (pin == 3) {
+               rc = axp209_read(AXP209_GPIO3_CTRL, &val);
+               mask = 1;
+       } else {
+               rc = axp209_read(AXP209_GPIO_STATE, &val);
+               mask = 1 << (pin + 4);
+       }
+       if (rc)
+               return rc;
+
+       return (val & mask) ? 1 : 0;
+}
+
+int axp_gpio_set_value(unsigned int pin, unsigned int val)
+{
+       return axp_gpio_direction_output(pin, val);
+}