diff options
Diffstat (limited to 'kernel/drivers/power/isp1704_charger.c')
| -rw-r--r-- | kernel/drivers/power/isp1704_charger.c | 548 |
1 files changed, 548 insertions, 0 deletions
diff --git a/kernel/drivers/power/isp1704_charger.c b/kernel/drivers/power/isp1704_charger.c new file mode 100644 index 000000000..f2a7d9703 --- /dev/null +++ b/kernel/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"); |