mfd: pm8xxx-misc: add pm8xxx_usb_id_pullup API
PM8921 family provides a pullup enable bit to support USB ID.
Add the API for such support.
Change-Id: Id3056af070080c1c12f27720020ae718fc6f34f6
Signed-off-by: Willie Ruan <wruan@codeaurora.org>
diff --git a/drivers/mfd/pm8xxx-misc.c b/drivers/mfd/pm8xxx-misc.c
index 283f985..eb0048a 100644
--- a/drivers/mfd/pm8xxx-misc.c
+++ b/drivers/mfd/pm8xxx-misc.c
@@ -132,6 +132,9 @@
#define UART_PATH_SEL_MASK 0x60
#define UART_PATH_SEL_SHIFT 0x5
+#define USB_ID_PU_EN_MASK 0x10 /* PM8921 family only */
+#define USB_ID_PU_EN_SHIFT 4
+
/* Shutdown/restart delays to allow for LDO 7/dVdd regulator load settling. */
#define PM8901_DELAY_AFTER_REG_DISABLE_MS 4
#define PM8901_DELAY_BEFORE_SHUTDOWN_MS 8
@@ -944,6 +947,48 @@
}
EXPORT_SYMBOL(pm8xxx_uart_gpio_mux_ctrl);
+/**
+ * pm8xxx_usb_id_pullup - Control a pullup for USB ID
+ *
+ * @enable: enable (1) or disable (0) the pullup
+ *
+ * RETURNS: an appropriate -ERRNO error value on error, or zero for success.
+ */
+int pm8xxx_usb_id_pullup(int enable)
+{
+ struct pm8xxx_misc_chip *chip;
+ unsigned long flags;
+ int rc = -ENXIO;
+
+ spin_lock_irqsave(&pm8xxx_misc_chips_lock, flags);
+
+ /* Loop over all attached PMICs and call specific functions for them. */
+ list_for_each_entry(chip, &pm8xxx_misc_chips, link) {
+ switch (chip->version) {
+ case PM8XXX_VERSION_8921:
+ case PM8XXX_VERSION_8922:
+ case PM8XXX_VERSION_8917:
+ case PM8XXX_VERSION_8038:
+ rc = pm8xxx_misc_masked_write(chip,
+ REG_PM8XXX_GPIO_MUX_CTRL, USB_ID_PU_EN_MASK,
+ enable << USB_ID_PU_EN_SHIFT);
+
+ if (rc)
+ pr_err("Fail: reg=%x, rc=%d\n",
+ REG_PM8XXX_GPIO_MUX_CTRL, rc);
+ break;
+ default:
+ /* Functionality not supported */
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(&pm8xxx_misc_chips_lock, flags);
+
+ return rc;
+}
+EXPORT_SYMBOL(pm8xxx_usb_id_pullup);
+
static int __pm8901_preload_dVdd(struct pm8xxx_misc_chip *chip)
{
int rc;