static inline int isp1704_charger_detect(struct isp1704_charger *isp)
{
unsigned long timeout;
u8 pwr_ctrl;
int ret = 0;
pwr_ctrl = isp1704_read(isp, ISP1704_PWR_CTRL);
/* set SW control bit in PWR_CTRL register */
isp1704_write(isp, ISP1704_PWR_CTRL,
ISP1704_PWR_CTRL_SWCTRL);
/* enable manual charger detection */
isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
ISP1704_PWR_CTRL_SWCTRL
| ISP1704_PWR_CTRL_DPVSRC_EN);
usleep_range(1000, 2000);
timeout = jiffies + msecs_to_jiffies(300);
do {
/* Check if there is a charger */
if (isp1704_read(isp, ISP1704_PWR_CTRL)
& ISP1704_PWR_CTRL_VDAT_DET) {
ret = isp1704_charger_verify(isp);
break;
}
} while (!time_after(jiffies, timeout) && isp->online);
/* recover original state */
isp1704_write(isp, ISP1704_PWR_CTRL, pwr_ctrl);
return ret;
}
/*
* 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 = isp1704_read(isp, ULPI_FUNC_CTRL);
otg_ctrl = isp1704_read(isp, ULPI_OTG_CTRL);
/* disable pulldowns */
reg = ULPI_OTG_CTRL_DM_PULLDOWN | ULPI_OTG_CTRL_DP_PULLDOWN;
isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), reg);
/* full speed */
isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
ULPI_FUNC_CTRL_XCVRSEL_MASK);
isp1704_write(isp, 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;
isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), reg);
usleep_range(1000, 2000);
reg = isp1704_read(isp, ULPI_DEBUG);
if ((reg & 3) != 3)
type = POWER_SUPPLY_TYPE_USB_CDP;
/* recover original state */
isp1704_write(isp, ULPI_FUNC_CTRL, func_ctrl);
isp1704_write(isp, 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.
*/
static inline int isp1704_charger_verify(struct isp1704_charger *isp)
{
int ret = 0;
u8 r;
/* Reset the transceiver */
r = isp1704_read(isp, ULPI_FUNC_CTRL);
r |= ULPI_FUNC_CTRL_RESET;
isp1704_write(isp, ULPI_FUNC_CTRL, r);
usleep_range(1000, 2000);
/* Set normal mode */
r &= ~(ULPI_FUNC_CTRL_RESET | ULPI_FUNC_CTRL_OPMODE_MASK);
isp1704_write(isp, ULPI_FUNC_CTRL, r);
/* Clear the DP and DM pull-down bits */
r = ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN;
isp1704_write(isp, ULPI_CLR(ULPI_OTG_CTRL), r);
/* Enable strong pull-up on DP (1.5K) and reset */
r = ULPI_FUNC_CTRL_TERMSELECT | ULPI_FUNC_CTRL_RESET;
isp1704_write(isp, ULPI_SET(ULPI_FUNC_CTRL), r);
usleep_range(1000, 2000);
/* Read the line state */
if (!isp1704_read(isp, ULPI_DEBUG)) {
/* Disable strong pull-up on DP (1.5K) */
isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
ULPI_FUNC_CTRL_TERMSELECT);
return 1;
}
/* Is it a charger or PS/2 connection */
/* Enable weak pull-up resistor on DP */
isp1704_write(isp, ULPI_SET(ISP1704_PWR_CTRL),
ISP1704_PWR_CTRL_DP_WKPU_EN);
/* Disable strong pull-up on DP (1.5K) */
isp1704_write(isp, ULPI_CLR(ULPI_FUNC_CTRL),
ULPI_FUNC_CTRL_TERMSELECT);
/* Enable weak pull-down resistor on DM */
isp1704_write(isp, ULPI_SET(ULPI_OTG_CTRL),
ULPI_OTG_CTRL_DM_PULLDOWN);
/* It's a charger if the line states are clear */
if (!(isp1704_read(isp, ULPI_DEBUG)))
ret = 1;
/* Disable weak pull-up resistor on DP */
isp1704_write(isp, ULPI_CLR(ISP1704_PWR_CTRL),
ISP1704_PWR_CTRL_DP_WKPU_EN);
return ret;
}
static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
{
int vendor;
int product;
int i;
int ret = -ENODEV;
/* Test ULPI interface */
ret = isp1704_write(isp, ULPI_SCRATCH, 0xaa);
if (ret < 0)
return ret;
ret = isp1704_read(isp, ULPI_SCRATCH);
if (ret < 0)
return ret;
if (ret != 0xaa)
return -ENODEV;
/* Verify the product and vendor id matches */
vendor = isp1704_read(isp, ULPI_VENDOR_ID_LOW);
vendor |= isp1704_read(isp, ULPI_VENDOR_ID_HIGH) << 8;
if (vendor != NXP_VENDOR_ID)
return -ENODEV;
product = isp1704_read(isp, ULPI_PRODUCT_ID_LOW);
product |= isp1704_read(isp, ULPI_PRODUCT_ID_HIGH) << 8;
for (i = 0; i < ARRAY_SIZE(isp170x_id); i++) {
if (product == isp170x_id[i]) {
sprintf(isp->model, "isp%x", product);
return product;
}
}
dev_err(isp->dev, "product id %x not matching known ids", product);
return -ENODEV;
}
static int __devinit isp1704_charger_probe(struct platform_device *pdev)
{
struct isp1704_charger *isp;
int ret = -ENODEV;
isp = kzalloc(sizeof *isp, GFP_KERNEL);
if (!isp)
return -ENOMEM;
isp->phy = usb_get_phy();
if (!isp->phy)
goto fail0;
isp->dev = &pdev->dev;
platform_set_drvdata(pdev, isp);
isp1704_charger_set_power(isp, 1);
ret = isp1704_test_ulpi(isp);
if (ret < 0)
goto fail1;
isp->psy.name = "isp1704";
isp->psy.type = POWER_SUPPLY_TYPE_USB;
isp->psy.properties = power_props;
isp->psy.num_properties = ARRAY_SIZE(power_props);
isp->psy.get_property = isp1704_charger_get_property;
ret = power_supply_register(isp->dev, &isp->psy);
if (ret)
goto fail1;
/*
* REVISIT: using work in order to allow the usb notifications to be
* made atomically in the future.
*/
INIT_WORK(&isp->work, isp1704_charger_work);
isp->nb.notifier_call = isp1704_notifier_call;
ret = usb_register_notifier(isp->phy, &isp->nb);
if (ret)
goto fail2;
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->phy->otg->gadget)
usb_gadget_disconnect(isp->phy->otg->gadget);
/* Detect charger if VBUS is valid (the cable was already plugged). */
ret = isp1704_read(isp, ULPI_USB_INT_STS);
isp1704_charger_set_power(isp, 0);
if ((ret & ULPI_INT_VBUS_VALID) && !isp->phy->otg->default_a) {
isp->event = USB_EVENT_VBUS;
schedule_work(&isp->work);
}
return 0;
fail2:
power_supply_unregister(&isp->psy);
fail1:
usb_put_phy(isp->phy);
fail0:
kfree(isp);
dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);
isp1704_charger_set_power(isp, 0);
return ret;
}
