usb: dwc3-msm: Add support for charger detection
DWC3 OTG driver can detect charger detection using DWC3 core or
external charger detection circuitry. Add support for external
charger detector in DWC3 OTG driver for MSM platform. This module
detects DCD and SDP/CDP/DCP type of chargers.
Change-Id: I5d1aec183fbcdc9b03aac74d626a4c39c56ed3b7
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
diff --git a/arch/arm/boot/dts/msmcopper.dtsi b/arch/arm/boot/dts/msmcopper.dtsi
index 5c0384f..77cbbe0 100644
--- a/arch/arm/boot/dts/msmcopper.dtsi
+++ b/arch/arm/boot/dts/msmcopper.dtsi
@@ -274,7 +274,7 @@
qcom,ssusb@F9200000 {
compatible = "qcom,dwc-usb3-msm";
- reg = <0xF9200000 0xCCFF>;
+ reg = <0xF9200000 0xFA000>;
interrupts = <0 131 0>;
SSUSB_VDDCX-supply = <&pm8841_s2>;
SSUSB_1p8-supply = <&pm8941_l6>;
diff --git a/drivers/usb/dwc3/dwc3-msm.c b/drivers/usb/dwc3/dwc3-msm.c
index 2e0450b..582dac5 100644
--- a/drivers/usb/dwc3/dwc3-msm.c
+++ b/drivers/usb/dwc3/dwc3-msm.c
@@ -30,6 +30,7 @@
#include <mach/rpm-regulator.h>
+#include "dwc3_otg.h"
#include "core.h"
#include "gadget.h"
@@ -87,6 +88,16 @@
#define DBM_TRB_DATA_SRC 0x40000000
#define DBM_TRB_DMA 0x20000000
#define DBM_TRB_EP_NUM(ep) (ep<<24)
+/**
+ * USB QSCRATCH Hardware registers
+ *
+ */
+#define QSCRATCH_REG_OFFSET (0x000F8800)
+#define CHARGING_DET_CTRL_REG (QSCRATCH_REG_OFFSET + 0x18)
+#define CHARGING_DET_OUTPUT_REG (QSCRATCH_REG_OFFSET + 0x1C)
+#define ALT_INTERRUPT_EN_REG (QSCRATCH_REG_OFFSET + 0x20)
+#define HS_PHY_IRQ_STAT_REG (QSCRATCH_REG_OFFSET + 0x24)
+
struct dwc3_msm_req_complete {
struct list_head list_item;
@@ -111,6 +122,11 @@
struct regulator *ssusb_vddcx;
enum usb_vdd_type ss_vdd_type;
enum usb_vdd_type hs_vdd_type;
+ struct dwc3_charger charger;
+ struct usb_phy *otg_xceiv;
+ struct delayed_work chg_work;
+ enum usb_chg_state chg_state;
+ u8 dcd_retries;
};
#define USB_HSPHY_3P3_VOL_MIN 3050000 /* uV */
@@ -222,6 +238,34 @@
}
/**
+ * Write register and read back masked value to confirm it is written
+ *
+ * @base - DWC3 base virtual address.
+ * @offset - register offset.
+ * @mask - register bitmask specifying what should be updated
+ * @val - value to write.
+ *
+ */
+static inline void dwc3_msm_write_readback(void *base, u32 offset,
+ const u32 mask, u32 val)
+{
+ u32 write_val, tmp = ioread32(base + offset);
+
+ tmp &= ~mask; /* retain other bits */
+ write_val = tmp | val;
+
+ iowrite32(write_val, base + offset);
+
+ /* Read back to see if val was written */
+ tmp = ioread32(base + offset);
+ tmp &= mask; /* clear other bits */
+
+ if (tmp != val)
+ dev_err(context->dev, "%s: write: %x to QSCRATCH: %x FAILED\n",
+ __func__, val, offset);
+}
+
+/**
* Return DBM EP number which is not already configured.
*
*/
@@ -997,6 +1041,184 @@
return rc < 0 ? rc : 0;
}
+static void dwc3_chg_enable_secondary_det(struct dwc3_msm *mdwc)
+{
+ u32 chg_ctrl;
+
+ /* Turn off VDP_SRC */
+ dwc3_msm_write_reg(mdwc->base, CHARGING_DET_CTRL_REG, 0x0);
+ msleep(20);
+
+ /* Before proceeding make sure VDP_SRC is OFF */
+ chg_ctrl = dwc3_msm_read_reg(mdwc->base, CHARGING_DET_CTRL_REG);
+ if (chg_ctrl & 0x3F)
+ dev_err(mdwc->dev, "%s Unable to reset chg_det block: %x\n",
+ __func__, chg_ctrl);
+ /*
+ * Configure DM as current source, DP as current sink
+ * and enable battery charging comparators.
+ */
+ dwc3_msm_write_readback(mdwc->base, CHARGING_DET_CTRL_REG, 0x3F, 0x34);
+}
+
+static bool dwc3_chg_det_check_output(struct dwc3_msm *mdwc)
+{
+ u32 chg_det;
+ bool ret = false;
+
+ chg_det = dwc3_msm_read_reg(mdwc->base, CHARGING_DET_OUTPUT_REG);
+ ret = chg_det & 1;
+
+ return ret;
+}
+
+static void dwc3_chg_enable_primary_det(struct dwc3_msm *mdwc)
+{
+ /*
+ * Configure DP as current source, DM as current sink
+ * and enable battery charging comparators.
+ */
+ dwc3_msm_write_readback(mdwc->base, CHARGING_DET_CTRL_REG, 0x3F, 0x30);
+}
+
+static inline bool dwc3_chg_check_dcd(struct dwc3_msm *mdwc)
+{
+ u32 chg_state;
+ bool ret = false;
+
+ chg_state = dwc3_msm_read_reg(mdwc->base, CHARGING_DET_OUTPUT_REG);
+ ret = chg_state & 2;
+
+ return ret;
+}
+
+static inline void dwc3_chg_disable_dcd(struct dwc3_msm *mdwc)
+{
+ dwc3_msm_write_readback(mdwc->base, CHARGING_DET_CTRL_REG, 0x3F, 0x0);
+}
+
+static inline void dwc3_chg_enable_dcd(struct dwc3_msm *mdwc)
+{
+ /* Data contact detection enable, DCDENB */
+ dwc3_msm_write_readback(mdwc->base, CHARGING_DET_CTRL_REG, 0x3F, 0x2);
+}
+
+static void dwc3_chg_block_reset(struct dwc3_msm *mdwc)
+{
+ u32 chg_ctrl;
+
+ /* Clear charger detecting control bits */
+ dwc3_msm_write_reg(mdwc->base, CHARGING_DET_CTRL_REG, 0x0);
+
+ /* Clear alt interrupt latch and enable bits */
+ dwc3_msm_write_reg(mdwc->base, HS_PHY_IRQ_STAT_REG, 0xFFF);
+ dwc3_msm_write_reg(mdwc->base, ALT_INTERRUPT_EN_REG, 0x0);
+
+ udelay(100);
+
+ /* Before proceeding make sure charger block is RESET */
+ chg_ctrl = dwc3_msm_read_reg(mdwc->base, CHARGING_DET_CTRL_REG);
+ if (chg_ctrl & 0x3F)
+ dev_err(mdwc->dev, "%s Unable to reset chg_det block: %x\n",
+ __func__, chg_ctrl);
+}
+
+static const char *chg_to_string(enum dwc3_chg_type chg_type)
+{
+ switch (chg_type) {
+ case USB_SDP_CHARGER: return "USB_SDP_CHARGER";
+ case USB_DCP_CHARGER: return "USB_DCP_CHARGER";
+ case USB_CDP_CHARGER: return "USB_CDP_CHARGER";
+ default: return "INVALID_CHARGER";
+ }
+}
+
+#define DWC3_CHG_DCD_POLL_TIME (100 * HZ/1000) /* 100 msec */
+#define DWC3_CHG_DCD_MAX_RETRIES 6 /* Tdcd_tmout = 6 * 100 msec */
+#define DWC3_CHG_PRIMARY_DET_TIME (50 * HZ/1000) /* TVDPSRC_ON */
+#define DWC3_CHG_SECONDARY_DET_TIME (50 * HZ/1000) /* TVDMSRC_ON */
+
+static void dwc3_chg_detect_work(struct work_struct *w)
+{
+ struct dwc3_msm *mdwc = container_of(w, struct dwc3_msm, chg_work.work);
+ bool is_dcd = false, tmout, vout;
+ unsigned long delay;
+
+ dev_dbg(mdwc->dev, "chg detection work\n");
+ switch (mdwc->chg_state) {
+ case USB_CHG_STATE_UNDEFINED:
+ dwc3_chg_block_reset(mdwc);
+ dwc3_chg_enable_dcd(mdwc);
+ mdwc->chg_state = USB_CHG_STATE_WAIT_FOR_DCD;
+ mdwc->dcd_retries = 0;
+ delay = DWC3_CHG_DCD_POLL_TIME;
+ break;
+ case USB_CHG_STATE_WAIT_FOR_DCD:
+ is_dcd = dwc3_chg_check_dcd(mdwc);
+ tmout = ++mdwc->dcd_retries == DWC3_CHG_DCD_MAX_RETRIES;
+ if (is_dcd || tmout) {
+ dwc3_chg_disable_dcd(mdwc);
+ dwc3_chg_enable_primary_det(mdwc);
+ delay = DWC3_CHG_PRIMARY_DET_TIME;
+ mdwc->chg_state = USB_CHG_STATE_DCD_DONE;
+ } else {
+ delay = DWC3_CHG_DCD_POLL_TIME;
+ }
+ break;
+ case USB_CHG_STATE_DCD_DONE:
+ vout = dwc3_chg_det_check_output(mdwc);
+ if (vout) {
+ dwc3_chg_enable_secondary_det(mdwc);
+ delay = DWC3_CHG_SECONDARY_DET_TIME;
+ mdwc->chg_state = USB_CHG_STATE_PRIMARY_DONE;
+ } else {
+ mdwc->charger.chg_type = USB_SDP_CHARGER;
+ mdwc->chg_state = USB_CHG_STATE_DETECTED;
+ delay = 0;
+ }
+ break;
+ case USB_CHG_STATE_PRIMARY_DONE:
+ vout = dwc3_chg_det_check_output(mdwc);
+ if (vout)
+ mdwc->charger.chg_type = USB_DCP_CHARGER;
+ else
+ mdwc->charger.chg_type = USB_CDP_CHARGER;
+ mdwc->chg_state = USB_CHG_STATE_SECONDARY_DONE;
+ /* fall through */
+ case USB_CHG_STATE_SECONDARY_DONE:
+ mdwc->chg_state = USB_CHG_STATE_DETECTED;
+ /* fall through */
+ case USB_CHG_STATE_DETECTED:
+ dwc3_chg_block_reset(mdwc);
+ dev_dbg(mdwc->dev, "chg_type = %s\n",
+ chg_to_string(mdwc->charger.chg_type));
+ mdwc->charger.notify_detection_complete(mdwc->otg_xceiv->otg,
+ &mdwc->charger);
+ return;
+ default:
+ return;
+ }
+
+ queue_delayed_work(system_nrt_wq, &mdwc->chg_work, delay);
+}
+
+static void dwc3_start_chg_det(struct dwc3_charger *charger, bool start)
+{
+ struct dwc3_msm *mdwc = context;
+
+ if (start == false) {
+ cancel_delayed_work_sync(&mdwc->chg_work);
+ mdwc->chg_state = USB_CHG_STATE_UNDEFINED;
+ charger->chg_type = DWC3_INVALID_CHARGER;
+ return;
+ }
+
+ mdwc->chg_state = USB_CHG_STATE_UNDEFINED;
+ charger->chg_type = DWC3_INVALID_CHARGER;
+ queue_delayed_work(system_nrt_wq, &mdwc->chg_work, 0);
+}
+
+
static int __devinit dwc3_msm_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
@@ -1016,6 +1238,7 @@
msm->dev = &pdev->dev;
INIT_LIST_HEAD(&msm->req_complete_list);
+ INIT_DELAYED_WORK(&msm->chg_work, dwc3_chg_detect_work);
/* SS PHY */
msm->ss_vdd_type = VDDCX_CORNER;
@@ -1155,8 +1378,24 @@
/* Reset the DBM */
dwc3_msm_dbm_soft_reset();
+ msm->otg_xceiv = usb_get_transceiver();
+ if (msm->otg_xceiv) {
+ msm->charger.start_detection = dwc3_start_chg_det;
+ ret = dwc3_set_charger(msm->otg_xceiv->otg, &msm->charger);
+ if (ret || !msm->charger.notify_detection_complete) {
+ dev_err(&pdev->dev, "failed to register charger: %d\n",
+ ret);
+ goto put_xcvr;
+ }
+ } else {
+ dev_err(&pdev->dev, "%s: No OTG transceiver found\n", __func__);
+ }
+
return 0;
+put_xcvr:
+ usb_put_transceiver(msm->otg_xceiv);
+ platform_device_del(dwc3);
put_pdev:
platform_device_put(dwc3);
disable_hs_ldo:
@@ -1183,6 +1422,10 @@
{
struct dwc3_msm *msm = platform_get_drvdata(pdev);
+ if (msm->otg_xceiv) {
+ dwc3_start_chg_det(&msm->charger, false);
+ usb_put_transceiver(msm->otg_xceiv);
+ }
platform_device_unregister(msm->dwc3);
dwc3_hsusb_ldo_enable(0);
diff --git a/drivers/usb/dwc3/dwc3_otg.c b/drivers/usb/dwc3/dwc3_otg.c
index 4449187..5df030a 100644
--- a/drivers/usb/dwc3/dwc3_otg.c
+++ b/drivers/usb/dwc3/dwc3_otg.c
@@ -235,6 +235,47 @@
}
/**
+ * dwc3_ext_chg_det_done - callback to handle charger detection completion
+ * @otg: Pointer to the otg transceiver structure
+ * @charger: Pointer to the external charger structure
+ *
+ * Returns 0 on success
+ */
+static void dwc3_ext_chg_det_done(struct usb_otg *otg, struct dwc3_charger *chg)
+{
+ struct dwc3_otg *dotg = container_of(otg, struct dwc3_otg, otg);
+
+ /*
+ * Ignore chg_detection notification if BSV has gone off by this time.
+ * STOP chg_det as part of !BSV handling would reset the chg_det flags
+ */
+ if (test_bit(B_SESS_VLD, &dotg->inputs))
+ schedule_work(&dotg->sm_work);
+}
+
+/**
+ * dwc3_set_charger - bind/unbind external charger driver
+ * @otg: Pointer to the otg transceiver structure
+ * @charger: Pointer to the external charger structure
+ *
+ * Returns 0 on success
+ */
+int dwc3_set_charger(struct usb_otg *otg, struct dwc3_charger *charger)
+{
+ struct dwc3_otg *dotg = container_of(otg, struct dwc3_otg, otg);
+
+ dotg->charger = charger;
+ if (charger)
+ charger->notify_detection_complete = dwc3_ext_chg_det_done;
+
+ return 0;
+}
+
+/* IRQs which OTG driver is interested in handling */
+#define DWC3_OEVT_MASK (DWC3_OEVTEN_OTGCONIDSTSCHNGEVNT | \
+ DWC3_OEVTEN_OTGBDEVVBUSCHNGEVNT)
+
+/**
* dwc3_otg_interrupt - interrupt handler for dwc3 otg events.
* @_dotg: Pointer to out controller context structure
*
@@ -243,44 +284,79 @@
static irqreturn_t dwc3_otg_interrupt(int irq, void *_dotg)
{
struct dwc3_otg *dotg = (struct dwc3_otg *)_dotg;
- u32 oevt_reg;
+ u32 osts, oevt_reg;
int ret = IRQ_NONE;
int handled_irqs = 0;
oevt_reg = dwc3_readl(dotg->regs, DWC3_OEVT);
- if (oevt_reg & DWC3_OEVTEN_OTGCONIDSTSCHNGEVNT) {
+ if (!(oevt_reg & DWC3_OEVT_MASK))
+ return IRQ_NONE;
+
+ osts = dwc3_readl(dotg->regs, DWC3_OSTS);
+
+ if ((oevt_reg & DWC3_OEVTEN_OTGCONIDSTSCHNGEVNT) ||
+ (oevt_reg & DWC3_OEVTEN_OTGBDEVVBUSCHNGEVNT)) {
/*
- * ID sts has changed, read it and later, in the workqueue
+ * ID sts has changed, set inputs later, in the workqueue
* function, switch from A to B or from B to A.
*/
- dotg->osts = dwc3_readl(dotg->regs, DWC3_OSTS);
- if ((dotg->otg.phy->state == OTG_STATE_B_IDLE) ||
- (dotg->otg.phy->state == OTG_STATE_A_IDLE)) {
- /*
- * OTG state is ABOUT to change to A or B device, but
- * since ID sts was chnaged, then we return the state
- * machine to the start point.
- */
- dotg->otg.phy->state = OTG_STATE_UNDEFINED;
- }
+ if (osts & DWC3_OTG_OSTS_CONIDSTS)
+ set_bit(ID, &dotg->inputs);
+ else
+ clear_bit(ID, &dotg->inputs);
+
+ if (osts & DWC3_OTG_OSTS_BSESVALID)
+ set_bit(B_SESS_VLD, &dotg->inputs);
+ else
+ clear_bit(B_SESS_VLD, &dotg->inputs);
+
schedule_work(&dotg->sm_work);
- handled_irqs |= DWC3_OEVTEN_OTGCONIDSTSCHNGEVNT;
+ handled_irqs |= (oevt_reg & DWC3_OEVTEN_OTGCONIDSTSCHNGEVNT) ?
+ DWC3_OEVTEN_OTGCONIDSTSCHNGEVNT : 0;
+ handled_irqs |= (oevt_reg & DWC3_OEVTEN_OTGBDEVVBUSCHNGEVNT) ?
+ DWC3_OEVTEN_OTGBDEVVBUSCHNGEVNT : 0;
+
ret = IRQ_HANDLED;
+
+ /* Clear the interrupts we handled */
+ dwc3_writel(dotg->regs, DWC3_OEVT, handled_irqs);
}
- /*
- * Clear the interrupts we handled.
- */
- if (ret == IRQ_HANDLED)
- dwc3_writel(dotg->regs, DWC3_OEVT, handled_irqs);
-
return ret;
}
/**
+ * dwc3_otg_init_sm - initialize OTG statemachine input
+ * @dotg: Pointer to the dwc3_otg structure
+ *
+ */
+void dwc3_otg_init_sm(struct dwc3_otg *dotg)
+{
+ u32 osts = dwc3_readl(dotg->regs, DWC3_OSTS);
+ struct usb_phy *phy = dotg->otg.phy;
+
+ /*
+ * TODO: If using external notifications then wait here till initial
+ * state is reported
+ */
+
+ dev_dbg(phy->dev, "Initialize OTG inputs, osts: 0x%x\n", osts);
+
+ if (osts & DWC3_OTG_OSTS_CONIDSTS)
+ set_bit(ID, &dotg->inputs);
+ else
+ clear_bit(ID, &dotg->inputs);
+
+ if (osts & DWC3_OTG_OSTS_BSESVALID)
+ set_bit(B_SESS_VLD, &dotg->inputs);
+ else
+ clear_bit(B_SESS_VLD, &dotg->inputs);
+}
+
+/**
* dwc3_otg_sm_work - workqueue function.
*
* @w: Pointer to the dwc3 otg workqueue
@@ -292,67 +368,144 @@
{
struct dwc3_otg *dotg = container_of(w, struct dwc3_otg, sm_work);
struct usb_phy *phy = dotg->otg.phy;
+ struct dwc3_charger *charger = dotg->charger;
+ bool work = 0;
dev_dbg(phy->dev, "%s state\n", otg_state_string(phy->state));
/* Check OTG state */
switch (phy->state) {
case OTG_STATE_UNDEFINED:
- /* Switch to A or B-Device according to IDSTS */
- if (dotg->osts & DWC3_OTG_OSTS_CONIDSTS)
+ dwc3_otg_init_sm(dotg);
+ /* Switch to A or B-Device according to ID / BSV */
+ if (!test_bit(ID, &dotg->inputs) && phy->otg->host) {
+ dev_dbg(phy->dev, "!id\n");
+ phy->state = OTG_STATE_A_IDLE;
+ work = 1;
+ } else if (test_bit(B_SESS_VLD, &dotg->inputs)) {
+ dev_dbg(phy->dev, "b_sess_vld\n");
phy->state = OTG_STATE_B_IDLE;
- else
- phy->state = OTG_STATE_A_IDLE;
-
- schedule_work(&dotg->sm_work);
- break;
- case OTG_STATE_B_IDLE:
- if (dwc3_otg_start_peripheral(&dotg->otg, 1)) {
- /*
- * Probably set_peripheral was not called yet.
- * We will re-try as soon as it will be called
- */
- dev_err(phy->dev,
- "unable to start B-device\n");
- phy->state = OTG_STATE_UNDEFINED;
- } else
- phy->state = OTG_STATE_B_PERIPHERAL;
-
- schedule_work(&dotg->sm_work);
- break;
- case OTG_STATE_B_PERIPHERAL:
- if (!(dotg->osts & DWC3_OTG_OSTS_CONIDSTS)) {
- dwc3_otg_start_peripheral(&dotg->otg, 0);
- phy->state = OTG_STATE_A_IDLE;
- schedule_work(&dotg->sm_work);
+ work = 1;
+ } else {
+ phy->state = OTG_STATE_B_IDLE;
+ /* TODO: Enter low power state */
}
break;
+
+ case OTG_STATE_B_IDLE:
+ if (!test_bit(ID, &dotg->inputs) && phy->otg->host) {
+ dev_dbg(phy->dev, "!id\n");
+ phy->state = OTG_STATE_A_IDLE;
+ work = 1;
+ if (charger) {
+ if (charger->chg_type == DWC3_INVALID_CHARGER)
+ charger->start_detection(dotg->charger,
+ false);
+ else
+ charger->chg_type =
+ DWC3_INVALID_CHARGER;
+ }
+ } else if (test_bit(B_SESS_VLD, &dotg->inputs)) {
+ dev_dbg(phy->dev, "b_sess_vld\n");
+ if (charger) {
+ /* Has charger been detected? If no detect it */
+ switch (charger->chg_type) {
+ case DWC3_DCP_CHARGER:
+ /* TODO: initiate LPM */
+ break;
+ case DWC3_CDP_CHARGER:
+ dwc3_otg_start_peripheral(&dotg->otg,
+ 1);
+ phy->state = OTG_STATE_B_PERIPHERAL;
+ work = 1;
+ break;
+ case DWC3_SDP_CHARGER:
+ dwc3_otg_start_peripheral(&dotg->otg,
+ 1);
+ phy->state = OTG_STATE_B_PERIPHERAL;
+ work = 1;
+ break;
+ default:
+ dev_dbg(phy->dev, "chg_det started\n");
+ charger->start_detection(charger, true);
+ break;
+ }
+ } else {
+ /* no charger registered, start peripheral */
+ if (dwc3_otg_start_peripheral(&dotg->otg, 1)) {
+ /*
+ * Probably set_peripheral not called
+ * yet. We will re-try as soon as it
+ * will be called
+ */
+ dev_err(phy->dev,
+ "unable to start B-device\n");
+ phy->state = OTG_STATE_UNDEFINED;
+ return;
+ }
+ }
+ } else {
+ if (charger) {
+ if (charger->chg_type == DWC3_INVALID_CHARGER)
+ charger->start_detection(dotg->charger,
+ false);
+ else
+ charger->chg_type =
+ DWC3_INVALID_CHARGER;
+ }
+ /* TODO: Enter low power state */
+ }
+ break;
+
+ case OTG_STATE_B_PERIPHERAL:
+ if (!test_bit(B_SESS_VLD, &dotg->inputs) ||
+ !test_bit(ID, &dotg->inputs)) {
+ dev_dbg(phy->dev, "!id || !bsv\n");
+ dwc3_otg_start_peripheral(&dotg->otg, 0);
+ phy->state = OTG_STATE_B_IDLE;
+ if (charger)
+ charger->chg_type = DWC3_INVALID_CHARGER;
+ work = 1;
+ }
+ break;
+
case OTG_STATE_A_IDLE:
/* Switch to A-Device*/
- if (dwc3_otg_start_host(&dotg->otg, 1)) {
- /*
- * Probably set_host was not called yet.
- * We will re-try as soon as it will be called
- */
- dev_err(phy->dev,
- "unable to start A-device\n");
- phy->state = OTG_STATE_UNDEFINED;
- } else
- phy->state = OTG_STATE_A_HOST;
-
- schedule_work(&dotg->sm_work);
- break;
- case OTG_STATE_A_HOST:
- if (dotg->osts & DWC3_OTG_OSTS_CONIDSTS) {
- dwc3_otg_start_host(&dotg->otg, 0);
+ if (test_bit(ID, &dotg->inputs)) {
+ dev_dbg(phy->dev, "id\n");
phy->state = OTG_STATE_B_IDLE;
- schedule_work(&dotg->sm_work);
+ work = 1;
+ } else {
+ if (dwc3_otg_start_host(&dotg->otg, 1)) {
+ /*
+ * Probably set_host was not called yet.
+ * We will re-try as soon as it will be called
+ */
+ dev_dbg(phy->dev,
+ "unable to start A-device\n");
+ phy->state = OTG_STATE_UNDEFINED;
+ return;
+ }
+ phy->state = OTG_STATE_A_HOST;
}
break;
+
+ case OTG_STATE_A_HOST:
+ if (test_bit(ID, &dotg->inputs)) {
+ dev_dbg(phy->dev, "id\n");
+ dwc3_otg_start_host(&dotg->otg, 0);
+ phy->state = OTG_STATE_B_IDLE;
+ work = 1;
+ }
+ break;
+
default:
dev_err(phy->dev, "%s: invalid otg-state\n", __func__);
}
+
+ if (work)
+ schedule_work(&dotg->sm_work);
}
@@ -384,13 +537,10 @@
/* Clear all otg events (interrupts) indications */
dwc3_writel(dotg->regs, DWC3_OEVT, 0xFFFF);
- /* Enable only the ConIDStsChngEn event*/
+ /* Enable ID/BSV StsChngEn event*/
dwc3_writel(dotg->regs, DWC3_OEVTEN,
- DWC3_OEVTEN_OTGCONIDSTSCHNGEVNT);
-
- /* Read OSTS */
- dotg->osts = dwc3_readl(dotg->regs, DWC3_OSTS);
-
+ DWC3_OEVTEN_OTGCONIDSTSCHNGEVNT |
+ DWC3_OEVTEN_OTGBDEVVBUSCHNGEVNT);
}
/**
@@ -502,6 +652,8 @@
/* dotg is null when GHWPARAMS6[10]=SRPSupport=0, see dwc3_otg_init */
if (dotg) {
+ if (dotg->charger)
+ dotg->charger->start_detection(dotg->charger, false);
cancel_work_sync(&dotg->sm_work);
usb_set_transceiver(NULL);
free_irq(dotg->irq, dotg);
diff --git a/drivers/usb/dwc3/dwc3_otg.h b/drivers/usb/dwc3/dwc3_otg.h
index a048306..0d8b61b 100644
--- a/drivers/usb/dwc3/dwc3_otg.h
+++ b/drivers/usb/dwc3/dwc3_otg.h
@@ -20,19 +20,57 @@
#include <linux/usb/otg.h>
+struct dwc3_charger;
+
/**
* struct dwc3_otg: OTG driver data. Shared by HCD and DCD.
* @otg: USB OTG Transceiver structure.
* @irq: IRQ number assigned for HSUSB controller.
* @regs: ioremapped register base address.
* @sm_work: OTG state machine work.
- * @osts: last value of the OSTS register, as read from HW.
+ * @charger: DWC3 external charger detector
+ * @inputs: OTG state machine inputs
*/
struct dwc3_otg {
struct usb_otg otg;
int irq;
void __iomem *regs;
struct work_struct sm_work;
- u32 osts;
+ struct dwc3_charger *charger;
+#define ID 0
+#define B_SESS_VLD 1
+ unsigned long inputs;
};
+
+/**
+ * USB charger types
+ *
+ * DWC3_INVALID_CHARGER Invalid USB charger.
+ * DWC3_SDP_CHARGER Standard downstream port. Refers to a downstream port
+ * on USB compliant host/hub.
+ * DWC3_DCP_CHARGER Dedicated charger port (AC charger/ Wall charger).
+ * DWC3_CDP_CHARGER Charging downstream port. Enumeration can happen and
+ * IDEV_CHG_MAX can be drawn irrespective of USB state.
+ */
+enum dwc3_chg_type {
+ DWC3_INVALID_CHARGER = 0,
+ DWC3_SDP_CHARGER,
+ DWC3_DCP_CHARGER,
+ DWC3_CDP_CHARGER,
+};
+
+struct dwc3_charger {
+ enum dwc3_chg_type chg_type;
+
+ /* start/stop charger detection, provided by external charger module */
+ void (*start_detection)(struct dwc3_charger *charger, bool start);
+
+ /* to notify OTG about charger detection completion, provided by OTG */
+ void (*notify_detection_complete)(struct usb_otg *otg,
+ struct dwc3_charger *charger);
+};
+
+/* for external charger driver */
+extern int dwc3_set_charger(struct usb_otg *otg, struct dwc3_charger *charger);
+
#endif /* __LINUX_USB_DWC3_OTG_H */