| /* |
| * 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 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.type = POWER_SUPPLY_TYPE_USB_DCP; |
| isp->current_max = 1800; |
| } else { |
| isp->psy.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.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.type = POWER_SUPPLY_TYPE_USB_CDP; |
| } |
| break; |
| case USB_EVENT_NONE: |
| isp->online = false; |
| 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->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 = |
| container_of(psy, struct isp1704_charger, 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 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.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, NULL); |
| 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); |
| |
| 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"); |