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path: root/drivers/power/isp1704_charger.c
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Diffstat (limited to 'drivers/power/isp1704_charger.c')
-rw-r--r--drivers/power/isp1704_charger.c201
1 files changed, 161 insertions, 40 deletions
diff --git a/drivers/power/isp1704_charger.c b/drivers/power/isp1704_charger.c
index 72512185f3e2..2ad9b14a5ce3 100644
--- a/drivers/power/isp1704_charger.c
+++ b/drivers/power/isp1704_charger.c
@@ -59,11 +59,61 @@ struct isp1704_charger {
struct notifier_block nb;
struct work_struct work;
- char model[7];
+ /* properties */
+ char model[8];
unsigned present:1;
+ unsigned online:1;
+ unsigned current_max;
+
+ /* temp storage variables */
+ unsigned long event;
+ unsigned max_power;
};
/*
+ * Determine is the charging port DCP (dedicated charger) or CDP (Host/HUB
+ * chargers).
+ *
+ * REVISIT: The method is defined in Battery Charging Specification and is
+ * applicable to any ULPI transceiver. Nothing isp170x specific here.
+ */
+static inline int isp1704_charger_type(struct isp1704_charger *isp)
+{
+ u8 reg;
+ u8 func_ctrl;
+ u8 otg_ctrl;
+ int type = POWER_SUPPLY_TYPE_USB_DCP;
+
+ func_ctrl = otg_io_read(isp->otg, ULPI_FUNC_CTRL);
+ otg_ctrl = otg_io_read(isp->otg, ULPI_OTG_CTRL);
+
+ /* disable pulldowns */
+ reg = ULPI_OTG_CTRL_DM_PULLDOWN | ULPI_OTG_CTRL_DP_PULLDOWN;
+ otg_io_write(isp->otg, ULPI_CLR(ULPI_OTG_CTRL), reg);
+
+ /* full speed */
+ otg_io_write(isp->otg, ULPI_CLR(ULPI_FUNC_CTRL),
+ ULPI_FUNC_CTRL_XCVRSEL_MASK);
+ otg_io_write(isp->otg, ULPI_SET(ULPI_FUNC_CTRL),
+ ULPI_FUNC_CTRL_FULL_SPEED);
+
+ /* Enable strong pull-up on DP (1.5K) and reset */
+ reg = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET;
+ otg_io_write(isp->otg, ULPI_SET(ULPI_FUNC_CTRL), reg);
+ usleep_range(1000, 2000);
+
+ reg = otg_io_read(isp->otg, ULPI_DEBUG);
+ if ((reg & 3) != 3)
+ type = POWER_SUPPLY_TYPE_USB_CDP;
+
+ /* recover original state */
+ otg_io_write(isp->otg, ULPI_FUNC_CTRL, func_ctrl);
+ otg_io_write(isp->otg, ULPI_OTG_CTRL, otg_ctrl);
+
+ return type;
+}
+
+/*
* ISP1704 detects PS/2 adapters as charger. To make sure the detected charger
* is actually a dedicated charger, the following steps need to be taken.
*/
@@ -127,16 +177,19 @@ static inline int isp1704_charger_verify(struct isp1704_charger *isp)
static inline int isp1704_charger_detect(struct isp1704_charger *isp)
{
unsigned long timeout;
- u8 r;
+ u8 pwr_ctrl;
int ret = 0;
+ pwr_ctrl = otg_io_read(isp->otg, ISP1704_PWR_CTRL);
+
/* set SW control bit in PWR_CTRL register */
otg_io_write(isp->otg, ISP1704_PWR_CTRL,
ISP1704_PWR_CTRL_SWCTRL);
/* enable manual charger detection */
- r = (ISP1704_PWR_CTRL_SWCTRL | ISP1704_PWR_CTRL_DPVSRC_EN);
- otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL), r);
+ otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL),
+ ISP1704_PWR_CTRL_SWCTRL
+ | ISP1704_PWR_CTRL_DPVSRC_EN);
usleep_range(1000, 2000);
timeout = jiffies + msecs_to_jiffies(300);
@@ -147,7 +200,10 @@ static inline int isp1704_charger_detect(struct isp1704_charger *isp)
ret = isp1704_charger_verify(isp);
break;
}
- } while (!time_after(jiffies, timeout));
+ } while (!time_after(jiffies, timeout) && isp->online);
+
+ /* recover original state */
+ otg_io_write(isp->otg, ISP1704_PWR_CTRL, pwr_ctrl);
return ret;
}
@@ -155,52 +211,92 @@ static inline int isp1704_charger_detect(struct isp1704_charger *isp)
static void isp1704_charger_work(struct work_struct *data)
{
int detect;
+ unsigned long event;
+ unsigned power;
struct isp1704_charger *isp =
container_of(data, struct isp1704_charger, work);
+ static DEFINE_MUTEX(lock);
- /*
- * FIXME Only supporting dedicated chargers even though isp1704 can
- * detect HUB and HOST chargers. If the device has already been
- * enumerated, the detection will break the connection.
- */
- if (isp->otg->state != OTG_STATE_B_IDLE)
- return;
+ event = isp->event;
+ power = isp->max_power;
- /* disable data pullups */
- if (isp->otg->gadget)
- usb_gadget_disconnect(isp->otg->gadget);
+ mutex_lock(&lock);
+
+ switch (event) {
+ case USB_EVENT_VBUS:
+ isp->online = true;
+
+ /* detect charger */
+ detect = isp1704_charger_detect(isp);
+
+ if (detect) {
+ isp->present = detect;
+ isp->psy.type = isp1704_charger_type(isp);
+ }
- /* detect charger */
- detect = isp1704_charger_detect(isp);
- if (detect) {
- isp->present = detect;
- power_supply_changed(&isp->psy);
+ switch (isp->psy.type) {
+ case POWER_SUPPLY_TYPE_USB_DCP:
+ isp->current_max = 1800;
+ break;
+ case POWER_SUPPLY_TYPE_USB_CDP:
+ /*
+ * Only 500mA here or high speed chirp
+ * handshaking may break
+ */
+ isp->current_max = 500;
+ /* FALLTHROUGH */
+ case POWER_SUPPLY_TYPE_USB:
+ default:
+ /* enable data pullups */
+ if (isp->otg->gadget)
+ usb_gadget_connect(isp->otg->gadget);
+ }
+ break;
+ case USB_EVENT_NONE:
+ isp->online = false;
+ isp->current_max = 0;
+ isp->present = 0;
+ isp->current_max = 0;
+ isp->psy.type = POWER_SUPPLY_TYPE_USB;
+
+ /*
+ * Disable data pullups. We need to prevent the controller from
+ * enumerating.
+ *
+ * FIXME: This is here to allow charger detection with Host/HUB
+ * chargers. The pullups may be enabled elsewhere, so this can
+ * not be the final solution.
+ */
+ if (isp->otg->gadget)
+ usb_gadget_disconnect(isp->otg->gadget);
+ break;
+ case USB_EVENT_ENUMERATED:
+ if (isp->present)
+ isp->current_max = 1800;
+ else
+ isp->current_max = power;
+ break;
+ default:
+ goto out;
}
- /* enable data pullups */
- if (isp->otg->gadget)
- usb_gadget_connect(isp->otg->gadget);
+ power_supply_changed(&isp->psy);
+out:
+ mutex_unlock(&lock);
}
static int isp1704_notifier_call(struct notifier_block *nb,
- unsigned long event, void *unused)
+ unsigned long event, void *power)
{
struct isp1704_charger *isp =
container_of(nb, struct isp1704_charger, nb);
- switch (event) {
- case USB_EVENT_VBUS:
- schedule_work(&isp->work);
- break;
- case USB_EVENT_NONE:
- if (isp->present) {
- isp->present = 0;
- power_supply_changed(&isp->psy);
- }
- break;
- default:
- return NOTIFY_DONE;
- }
+ isp->event = event;
+
+ if (power)
+ isp->max_power = *((unsigned *)power);
+
+ schedule_work(&isp->work);
return NOTIFY_OK;
}
@@ -216,6 +312,12 @@ static int isp1704_charger_get_property(struct power_supply *psy,
case POWER_SUPPLY_PROP_PRESENT:
val->intval = isp->present;
break;
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = isp->online;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_MAX:
+ val->intval = isp->current_max;
+ break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = isp->model;
break;
@@ -230,6 +332,8 @@ static int isp1704_charger_get_property(struct power_supply *psy,
static enum power_supply_property power_props[] = {
POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_CURRENT_MAX,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,
};
@@ -287,13 +391,13 @@ static int __devinit isp1704_charger_probe(struct platform_device *pdev)
if (!isp->otg)
goto fail0;
+ isp->dev = &pdev->dev;
+ platform_set_drvdata(pdev, isp);
+
ret = isp1704_test_ulpi(isp);
if (ret < 0)
goto fail1;
- isp->dev = &pdev->dev;
- platform_set_drvdata(pdev, isp);
-
isp->psy.name = "isp1704";
isp->psy.type = POWER_SUPPLY_TYPE_USB;
isp->psy.properties = power_props;
@@ -318,6 +422,23 @@ static int __devinit isp1704_charger_probe(struct platform_device *pdev)
dev_info(isp->dev, "registered with product id %s\n", isp->model);
+ /*
+ * Taking over the D+ pullup.
+ *
+ * FIXME: The device will be disconnected if it was already
+ * enumerated. The charger driver should be always loaded before any
+ * gadget is loaded.
+ */
+ if (isp->otg->gadget)
+ usb_gadget_disconnect(isp->otg->gadget);
+
+ /* Detect charger if VBUS is valid (the cable was already plugged). */
+ ret = otg_io_read(isp->otg, ULPI_USB_INT_STS);
+ if ((ret & ULPI_INT_VBUS_VALID) && !isp->otg->default_a) {
+ isp->event = USB_EVENT_VBUS;
+ schedule_work(&isp->work);
+ }
+
return 0;
fail2:
power_supply_unregister(&isp->psy);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 10:09:39 +0100