This patch configures the pull-up/pull-down properties based on the
ACPI configuration. It scans the children of the DLN2 root entry and
looks for GPIO resources and applies the pull-up/pull-down
configurations on the pins.
Signed-off-by: Octavian Purdila <octavian.purd...@intel.com>
---
drivers/gpio/gpio-dln2.c | 76 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 76 insertions(+)
diff --git a/drivers/gpio/gpio-dln2.c b/drivers/gpio/gpio-dln2.c
index 2fdb138..98189d5 100644
--- a/drivers/gpio/gpio-dln2.c
+++ b/drivers/gpio/gpio-dln2.c
@@ -19,6 +19,7 @@
#include <linux/gpio/driver.h>
#include <linux/platform_device.h>
#include <linux/mfd/dln2.h>
+#include <linux/acpi.h>
#define DLN2_GPIO_ID 0x01
@@ -36,6 +37,10 @@
#define DLN2_GPIO_PIN_GET_DIRECTION DLN2_CMD(0x14, DLN2_GPIO_ID)
#define DLN2_GPIO_PIN_SET_EVENT_CFG DLN2_CMD(0x1E, DLN2_GPIO_ID)
#define DLN2_GPIO_PIN_GET_EVENT_CFG DLN2_CMD(0x1F, DLN2_GPIO_ID)
+#define CMD_GPIO_PIN_PULLUP_ENABLE DLN2_CMD(0x18, DLN2_GPIO_ID)
+#define CMD_GPIO_PIN_PULLUP_DISABLE DLN2_CMD(0x19, DLN2_GPIO_ID)
+#define CMD_GPIO_PIN_PULLDOWN_ENABLE DLN2_CMD(0x20, DLN2_GPIO_ID)
+#define CMD_GPIO_PIN_PULLDOWN_DISABLE DLN2_CMD(0x21, DLN2_GPIO_ID)
#define DLN2_GPIO_EVENT_NONE 0
#define DLN2_GPIO_EVENT_CHANGE 1
@@ -428,6 +433,75 @@ static void dln2_gpio_event(struct platform_device *pdev,
u16 echo,
}
}
+#if IS_ENABLED(CONFIG_ACPI)
+static int dln2_gpio_do_acpi_setup(struct acpi_resource *ares, void *data)
+{
+ int i;
+ u16 cmd[2];
+ const char *info;
+ struct dln2_gpio *dln2 = data;
+ const struct acpi_resource_gpio *agpio = &ares->data.gpio;
+
+ if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
+ return 1;
+
+ switch (agpio->pin_config) {
+ case ACPI_PIN_CONFIG_PULLUP:
+ info = "pullup";
+ cmd[0] = CMD_GPIO_PIN_PULLDOWN_DISABLE;
+ cmd[1] = CMD_GPIO_PIN_PULLUP_ENABLE;
+ break;
+ case ACPI_PIN_CONFIG_PULLDOWN:
+ info = "pulldown";
+ cmd[0] = CMD_GPIO_PIN_PULLDOWN_ENABLE;
+ cmd[1] = CMD_GPIO_PIN_PULLUP_DISABLE;
+ break;
+ case ACPI_PIN_CONFIG_NOPULL:
+ info = "nopull";
+ cmd[0] = CMD_GPIO_PIN_PULLDOWN_DISABLE;
+ cmd[1] = CMD_GPIO_PIN_PULLUP_DISABLE;
+ break;
+ default:
+ return 1;
+ }
+
+ for (i = 0; i < agpio->pin_table_length; i++) {
+ int pin = agpio->pin_table[i];
+
+ dev_info(dln2->gpio.dev, "setting %s on pin %d\n", info, pin);
+ dln2_gpio_pin_cmd(dln2, cmd[0], pin);
+ dln2_gpio_pin_cmd(dln2, cmd[1], pin);
+ }
+
+ return 1;
+}
+
+static void dln2_gpio_acpi_setup(struct dln2_gpio *dln2)
+{
+ struct acpi_device *adev, *child;
+ acpi_handle handle;
+
+ handle = ACPI_HANDLE(dln2->gpio.dev);
+ if (!handle || acpi_bus_get_device(handle, &adev))
+ return;
+
+ list_for_each_entry(child, &adev->children, node) {
+ LIST_HEAD(res);
+ int ret;
+
+ ret = acpi_dev_get_resources(child, &res,
+ dln2_gpio_do_acpi_setup, dln2);
+ if (ret < 0)
+ continue;
+ acpi_dev_free_resource_list(&res);
+ }
+}
+#else
+static void dln2_gpio_acpi_setup(struct dln2_gpio *dln2)
+{
+}
+#endif
+
static int dln2_gpio_probe(struct platform_device *pdev)
{
struct dln2_gpio *dln2;
@@ -492,6 +566,8 @@ static int dln2_gpio_probe(struct platform_device *pdev)
goto out_gpiochip_remove;
}
+ dln2_gpio_acpi_setup(dln2);
+
return 0;
out_gpiochip_remove:
--
1.9.1
--
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