Initial import

1 files changed, 548 insertions, 0 deletions

diff --git a/drivers/power/isp1704_charger.c b/drivers/power/isp1704_charger.c
new file mode 100644
index 000000000..f2a7d9703
--- /dev/null
+++ b/drivers/power/isp1704_charger.c
@@ -0,0 +1,548 @@
+/*
+ * ISP1704 USB Charger Detection driver
+ *
+ * Copyright (C) 2010 Nokia Corporation
+ * Copyright (C) 2012 - 2013 Pali Rohár <pali.rohar@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/sysfs.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+
+#include <linux/usb/otg.h>
+#include <linux/usb/ulpi.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/power/isp1704_charger.h>
+
+/* Vendor specific Power Control register */
+#define ISP1704_PWR_CTRL		0x3d
+#define ISP1704_PWR_CTRL_SWCTRL		(1 << 0)
+#define ISP1704_PWR_CTRL_DET_COMP	(1 << 1)
+#define ISP1704_PWR_CTRL_BVALID_RISE	(1 << 2)
+#define ISP1704_PWR_CTRL_BVALID_FALL	(1 << 3)
+#define ISP1704_PWR_CTRL_DP_WKPU_EN	(1 << 4)
+#define ISP1704_PWR_CTRL_VDAT_DET	(1 << 5)
+#define ISP1704_PWR_CTRL_DPVSRC_EN	(1 << 6)
+#define ISP1704_PWR_CTRL_HWDETECT	(1 << 7)
+
+#define NXP_VENDOR_ID			0x04cc
+
+static u16 isp170x_id[] = {
+	0x1704,
+	0x1707,
+};
+
+struct isp1704_charger {
+	struct device			*dev;
+	struct power_supply		*psy;
+	struct power_supply_desc	psy_desc;
+	struct usb_phy			*phy;
+	struct notifier_block		nb;
+	struct work_struct		work;
+
+	/* properties */
+	char			model[8];
+	unsigned		present:1;
+	unsigned		online:1;
+	unsigned		current_max;
+};
+
+static inline int isp1704_read(struct isp1704_charger *isp, u32 reg)
+{
+	return usb_phy_io_read(isp->phy, reg);
+}
+
+static inline int isp1704_write(struct isp1704_charger *isp, u32 val, u32 reg)
+{
+	return usb_phy_io_write(isp->phy, val, reg);
+}
+
+/*
+ * Disable/enable the power from the isp1704 if a function for it
+ * has been provided with platform data.
+ */
+static void isp1704_charger_set_power(struct isp1704_charger *isp, bool on)
+{
+	struct isp1704_charger_data	*board = isp->dev->platform_data;
+
+	if (board && board->set_power)
+		board->set_power(on);
+	else if (board)
+		gpio_set_value(board->enable_gpio, on);
+}
+
+/*
+ * 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_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;
+}
+
+static inline int isp1704_charger_detect_dcp(struct isp1704_charger *isp)
+{
+	if (isp1704_charger_detect(isp) &&
+			isp1704_charger_type(isp) == POWER_SUPPLY_TYPE_USB_DCP)
+		return true;
+	else
+		return false;
+}
+
+static void isp1704_charger_work(struct work_struct *data)
+{
+	struct isp1704_charger	*isp =
+		container_of(data, struct isp1704_charger, work);
+	static DEFINE_MUTEX(lock);
+
+	mutex_lock(&lock);
+
+	switch (isp->phy->last_event) {
+	case USB_EVENT_VBUS:
+		/* do not call wall charger detection more times */
+		if (!isp->present) {
+			isp->online = true;
+			isp->present = 1;
+			isp1704_charger_set_power(isp, 1);
+
+			/* detect wall charger */
+			if (isp1704_charger_detect_dcp(isp)) {
+				isp->psy_desc.type = POWER_SUPPLY_TYPE_USB_DCP;
+				isp->current_max = 1800;
+			} else {
+				isp->psy_desc.type = POWER_SUPPLY_TYPE_USB;
+				isp->current_max = 500;
+			}
+
+			/* enable data pullups */
+			if (isp->phy->otg->gadget)
+				usb_gadget_connect(isp->phy->otg->gadget);
+		}
+
+		if (isp->psy_desc.type != POWER_SUPPLY_TYPE_USB_DCP) {
+			/*
+			 * Only 500mA here or high speed chirp
+			 * handshaking may break
+			 */
+			if (isp->current_max > 500)
+				isp->current_max = 500;
+
+			if (isp->current_max > 100)
+				isp->psy_desc.type = POWER_SUPPLY_TYPE_USB_CDP;
+		}
+		break;
+	case USB_EVENT_NONE:
+		isp->online = false;
+		isp->present = 0;
+		isp->current_max = 0;
+		isp->psy_desc.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->phy->otg->gadget)
+			usb_gadget_disconnect(isp->phy->otg->gadget);
+
+		isp1704_charger_set_power(isp, 0);
+		break;
+	default:
+		goto out;
+	}
+
+	power_supply_changed(isp->psy);
+out:
+	mutex_unlock(&lock);
+}
+
+static int isp1704_notifier_call(struct notifier_block *nb,
+		unsigned long val, void *v)
+{
+	struct isp1704_charger *isp =
+		container_of(nb, struct isp1704_charger, nb);
+
+	schedule_work(&isp->work);
+
+	return NOTIFY_OK;
+}
+
+static int isp1704_charger_get_property(struct power_supply *psy,
+				enum power_supply_property psp,
+				union power_supply_propval *val)
+{
+	struct isp1704_charger *isp = power_supply_get_drvdata(psy);
+
+	switch (psp) {
+	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;
+	case POWER_SUPPLY_PROP_MANUFACTURER:
+		val->strval = "NXP";
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+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,
+};
+
+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 isp1704_charger_probe(struct platform_device *pdev)
+{
+	struct isp1704_charger	*isp;
+	int			ret = -ENODEV;
+	struct power_supply_config psy_cfg = {};
+
+	struct isp1704_charger_data *pdata = dev_get_platdata(&pdev->dev);
+	struct device_node *np = pdev->dev.of_node;
+
+	if (np) {
+		int gpio = of_get_named_gpio(np, "nxp,enable-gpio", 0);
+
+		if (gpio < 0)
+			return gpio;
+
+		pdata = devm_kzalloc(&pdev->dev,
+			sizeof(struct isp1704_charger_data), GFP_KERNEL);
+		pdata->enable_gpio = gpio;
+
+		dev_info(&pdev->dev, "init gpio %d\n", pdata->enable_gpio);
+
+		ret = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio,
+					GPIOF_OUT_INIT_HIGH, "isp1704_reset");
+		if (ret)
+			goto fail0;
+	}
+
+	if (!pdata) {
+		dev_err(&pdev->dev, "missing platform data!\n");
+		return -ENODEV;
+	}
+
+
+	isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL);
+	if (!isp)
+		return -ENOMEM;
+
+	if (np)
+		isp->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
+	else
+		isp->phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
+
+	if (IS_ERR(isp->phy)) {
+		ret = PTR_ERR(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_desc.name		= "isp1704";
+	isp->psy_desc.type		= POWER_SUPPLY_TYPE_USB;
+	isp->psy_desc.properties	= power_props;
+	isp->psy_desc.num_properties	= ARRAY_SIZE(power_props);
+	isp->psy_desc.get_property	= isp1704_charger_get_property;
+
+	psy_cfg.drv_data		= isp;
+
+	isp->psy = power_supply_register(isp->dev, &isp->psy_desc, &psy_cfg);
+	if (IS_ERR(isp->psy)) {
+		ret = PTR_ERR(isp->psy);
+		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);
+
+	if (isp->phy->last_event == USB_EVENT_NONE)
+		isp1704_charger_set_power(isp, 0);
+
+	/* Detect charger if VBUS is valid (the cable was already plugged). */
+	if (isp->phy->last_event == USB_EVENT_VBUS &&
+			!isp->phy->otg->default_a)
+		schedule_work(&isp->work);
+
+	return 0;
+fail2:
+	power_supply_unregister(isp->psy);
+fail1:
+	isp1704_charger_set_power(isp, 0);
+fail0:
+	dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret);
+
+	return ret;
+}
+
+static int isp1704_charger_remove(struct platform_device *pdev)
+{
+	struct isp1704_charger *isp = platform_get_drvdata(pdev);
+
+	usb_unregister_notifier(isp->phy, &isp->nb);
+	power_supply_unregister(isp->psy);
+	isp1704_charger_set_power(isp, 0);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id omap_isp1704_of_match[] = {
+	{ .compatible = "nxp,isp1704", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, omap_isp1704_of_match);
+#endif
+
+static struct platform_driver isp1704_charger_driver = {
+	.driver = {
+		.name = "isp1704_charger",
+		.of_match_table = of_match_ptr(omap_isp1704_of_match),
+	},
+	.probe = isp1704_charger_probe,
+	.remove = isp1704_charger_remove,
+};
+
+module_platform_driver(isp1704_charger_driver);
+
+MODULE_ALIAS("platform:isp1704_charger");
+MODULE_AUTHOR("Nokia Corporation");
+MODULE_DESCRIPTION("ISP170x USB Charger driver");
+MODULE_LICENSE("GPL");