[PATCH v2 1/4] usb: chipidea: add usb charger detection support

[Li Jun <jun.li@xxxxxxx>]

Some usb module implementations have functionality of detect usb charger
type, it can be used by usb charger framework to report max current drawn
from charger in different situations.

Signed-off-by: Li Jun <jun.li@xxxxxxx>
---
 drivers/usb/chipidea/udc.c   | 40 ++++++++++++++++++++++++++++++++++++++++
 include/linux/usb/chipidea.h | 18 ++++++++++++++++++
 2 files changed, 58 insertions(+)

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 065f5d9..0a1b5ec 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1510,6 +1510,37 @@ static const struct usb_ep_ops usb_ep_ops = {
 /******************************************************************************
  * GADGET block
  *****************************************************************************/
+static enum usb_charger_type ci_usb_charger_detect(struct usb_charger *charger)
+{
+	struct ci_hdrc *ci;
+	enum usb_charger_type ret = UNKNOWN_TYPE;
+
+	if (!charger || !charger->gadget)
+		return ret;
+
+	ci = container_of(charger->gadget, struct ci_hdrc, gadget);
+	if (ci->vbus_active) {
+		if (ci->platdata->usb_charger_detect) {
+			ret = ci->platdata->usb_charger_detect(ci);
+			if (ret != UNKNOWN_TYPE)
+				return ret;
+		}
+
+		if (ci->platdata->pull_dp_for_charger) {
+			hw_device_reset(ci);
+			hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
+		}
+
+		if (ci->platdata->usb_charger_secondary_detect)
+			ret = ci->platdata->usb_charger_secondary_detect(ci);
+
+		if (ci->platdata->pull_dp_for_charger)
+			hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
+	}
+
+	return ret;
+}
+
 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
 {
 	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
@@ -1522,6 +1553,9 @@ static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
 		gadget_ready = 1;
 	spin_unlock_irqrestore(&ci->lock, flags);
 
+	if (_gadget->charger && _gadget->charger->charger_detect && is_active)
+		usb_charger_detect_type(_gadget->charger);
+
 	if (gadget_ready) {
 		if (is_active) {
 			pm_runtime_get_sync(&_gadget->dev);
@@ -1922,6 +1956,9 @@ static int udc_start(struct ci_hdrc *ci)
 	if (retval)
 		goto destroy_eps;
 
+	if (ci->gadget.charger && ci->platdata->usb_charger_detect)
+		ci->gadget.charger->charger_detect = ci_usb_charger_detect;
+
 	pm_runtime_no_callbacks(&ci->gadget.dev);
 	pm_runtime_enable(&ci->gadget.dev);
 
@@ -1946,6 +1983,9 @@ void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
 	if (!ci->roles[CI_ROLE_GADGET])
 		return;
 
+	if (ci->gadget.charger)
+		ci->gadget.charger->charger_detect = NULL;
+
 	usb_del_gadget_udc(&ci->gadget);
 
 	destroy_eps(ci);
diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
index 5dd75fa..93224c8 100644
--- a/include/linux/usb/chipidea.h
+++ b/include/linux/usb/chipidea.h
@@ -55,10 +55,28 @@ struct ci_hdrc_platform_data {
 #define CI_HDRC_OVERRIDE_AHB_BURST	BIT(9)
 #define CI_HDRC_OVERRIDE_TX_BURST	BIT(10)
 #define CI_HDRC_OVERRIDE_RX_BURST	BIT(11)
+#define CI_HDRC_PULL_DP_FOR_CHARGER	BIT(12)
 	enum usb_dr_mode	dr_mode;
 #define CI_HDRC_CONTROLLER_RESET_EVENT		0
 #define CI_HDRC_CONTROLLER_STOPPED_EVENT	1
 	void	(*notify_event) (struct ci_hdrc *ci, unsigned event);
+	/*
+	 * charger detection whole process, or first stage if have to
+	 * split it to be 2 stages, secondary stage will be handled by
+	 * usb_charger_secondary_detect.
+	 */
+	enum usb_charger_type (*usb_charger_detect)(struct ci_hdrc *ci);
+	/*
+	 * Set this flag if pull up and down DP line is required
+	 * before and after secondary detection.
+	 */
+	bool	pull_dp_for_charger;
+	/*
+	 * usb charger secondary detection phrase if need split it
+	 * out of usb_charger_detection.
+	 */
+	enum usb_charger_type (*usb_charger_secondary_detect)
+					(struct ci_hdrc *ci);
 	struct regulator	*reg_vbus;
 	struct usb_otg_caps	ci_otg_caps;
 	bool			tpl_support;
-- 
1.9.1

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