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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/power/isp1704_charger.c
Initial import
Diffstat (limited to 'drivers/power/isp1704_charger.c')
-rw-r--r--drivers/power/isp1704_charger.c548
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");