diff options
Diffstat (limited to 'drivers/power/isp1704_charger.c')
| -rw-r--r-- | drivers/power/isp1704_charger.c | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/drivers/power/isp1704_charger.c b/drivers/power/isp1704_charger.c new file mode 100644 index 00000000000..72512185f3e --- /dev/null +++ b/drivers/power/isp1704_charger.c @@ -0,0 +1,369 @@ +/* + * ISP1704 USB Charger Detection driver + * + * Copyright (C) 2010 Nokia Corporation + * + * 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/usb/otg.h> +#include <linux/usb/ulpi.h> +#include <linux/usb/ch9.h> +#include <linux/usb/gadget.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 otg_transceiver *otg; + struct notifier_block nb; + struct work_struct work; + + char model[7]; + unsigned present:1; +}; + +/* + * 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 = otg_io_read(isp->otg, ULPI_FUNC_CTRL); + r |= ULPI_FUNC_CTRL_RESET; + otg_io_write(isp->otg, ULPI_FUNC_CTRL, r); + usleep_range(1000, 2000); + + /* Set normal mode */ + r &= ~(ULPI_FUNC_CTRL_RESET | ULPI_FUNC_CTRL_OPMODE_MASK); + otg_io_write(isp->otg, ULPI_FUNC_CTRL, r); + + /* Clear the DP and DM pull-down bits */ + r = ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN; + otg_io_write(isp->otg, 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; + otg_io_write(isp->otg, ULPI_SET(ULPI_FUNC_CTRL), r); + usleep_range(1000, 2000); + + /* Read the line state */ + if (!otg_io_read(isp->otg, ULPI_DEBUG)) { + /* Disable strong pull-up on DP (1.5K) */ + otg_io_write(isp->otg, 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 */ + otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL), + ISP1704_PWR_CTRL_DP_WKPU_EN); + + /* Disable strong pull-up on DP (1.5K) */ + otg_io_write(isp->otg, ULPI_CLR(ULPI_FUNC_CTRL), + ULPI_FUNC_CTRL_TERMSELECT); + + /* Enable weak pull-down resistor on DM */ + otg_io_write(isp->otg, ULPI_SET(ULPI_OTG_CTRL), + ULPI_OTG_CTRL_DM_PULLDOWN); + + /* It's a charger if the line states are clear */ + if (!(otg_io_read(isp->otg, ULPI_DEBUG))) + ret = 1; + + /* Disable weak pull-up resistor on DP */ + otg_io_write(isp->otg, 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 r; + int ret = 0; + + /* set SW control bit in PWR_CTRL register */ + otg_io_write(isp->otg, ISP1704_PWR_CTRL, + ISP1704_PWR_CTRL_SWCTRL); + + /* enable manual charger detection */ + r = (ISP1704_PWR_CTRL_SWCTRL | ISP1704_PWR_CTRL_DPVSRC_EN); + otg_io_write(isp->otg, ULPI_SET(ISP1704_PWR_CTRL), r); + usleep_range(1000, 2000); + + timeout = jiffies + msecs_to_jiffies(300); + do { + /* Check if there is a charger */ + if (otg_io_read(isp->otg, ISP1704_PWR_CTRL) + & ISP1704_PWR_CTRL_VDAT_DET) { + ret = isp1704_charger_verify(isp); + break; + } + } while (!time_after(jiffies, timeout)); + + return ret; +} + +static void isp1704_charger_work(struct work_struct *data) +{ + int detect; + struct isp1704_charger *isp = + container_of(data, struct isp1704_charger, work); + + /* + * FIXME Only supporting dedicated chargers even though isp1704 can + * detect HUB and HOST chargers. If the device has already been + * enumerated, the detection will break the connection. + */ + if (isp->otg->state != OTG_STATE_B_IDLE) + return; + + /* disable data pullups */ + if (isp->otg->gadget) + usb_gadget_disconnect(isp->otg->gadget); + + /* detect charger */ + detect = isp1704_charger_detect(isp); + if (detect) { + isp->present = detect; + power_supply_changed(&isp->psy); + } + + /* enable data pullups */ + if (isp->otg->gadget) + usb_gadget_connect(isp->otg->gadget); +} + +static int isp1704_notifier_call(struct notifier_block *nb, + unsigned long event, void *unused) +{ + struct isp1704_charger *isp = + container_of(nb, struct isp1704_charger, nb); + + switch (event) { + case USB_EVENT_VBUS: + schedule_work(&isp->work); + break; + case USB_EVENT_NONE: + if (isp->present) { + isp->present = 0; + power_supply_changed(&isp->psy); + } + break; + default: + return NOTIFY_DONE; + } + + 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_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_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 = otg_io_write(isp->otg, ULPI_SCRATCH, 0xaa); + if (ret < 0) + return ret; + + ret = otg_io_read(isp->otg, ULPI_SCRATCH); + if (ret < 0) + return ret; + + if (ret != 0xaa) + return -ENODEV; + + /* Verify the product and vendor id matches */ + vendor = otg_io_read(isp->otg, ULPI_VENDOR_ID_LOW); + vendor |= otg_io_read(isp->otg, ULPI_VENDOR_ID_HIGH) << 8; + if (vendor != NXP_VENDOR_ID) + return -ENODEV; + + product = otg_io_read(isp->otg, ULPI_PRODUCT_ID_LOW); + product |= otg_io_read(isp->otg, 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->otg = otg_get_transceiver(); + if (!isp->otg) + goto fail0; + + ret = isp1704_test_ulpi(isp); + if (ret < 0) + goto fail1; + + isp->dev = &pdev->dev; + platform_set_drvdata(pdev, isp); + + 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 otg notifications to be + * made atomically in the future. + */ + INIT_WORK(&isp->work, isp1704_charger_work); + + isp->nb.notifier_call = isp1704_notifier_call; + + ret = otg_register_notifier(isp->otg, &isp->nb); + if (ret) + goto fail2; + + dev_info(isp->dev, "registered with product id %s\n", isp->model); + + return 0; +fail2: + power_supply_unregister(&isp->psy); +fail1: + otg_put_transceiver(isp->otg); +fail0: + kfree(isp); + + dev_err(&pdev->dev, "failed to register isp1704 with error %d\n", ret); + + return ret; +} + +static int __devexit isp1704_charger_remove(struct platform_device *pdev) +{ + struct isp1704_charger *isp = platform_get_drvdata(pdev); + + otg_unregister_notifier(isp->otg, &isp->nb); + power_supply_unregister(&isp->psy); + otg_put_transceiver(isp->otg); + kfree(isp); + + return 0; +} + +static struct platform_driver isp1704_charger_driver = { + .driver = { + .name = "isp1704_charger", + }, + .probe = isp1704_charger_probe, + .remove = __devexit_p(isp1704_charger_remove), +}; + +static int __init isp1704_charger_init(void) +{ + return platform_driver_register(&isp1704_charger_driver); +} +module_init(isp1704_charger_init); + +static void __exit isp1704_charger_exit(void) +{ + platform_driver_unregister(&isp1704_charger_driver); +} +module_exit(isp1704_charger_exit); + +MODULE_ALIAS("platform:isp1704_charger"); +MODULE_AUTHOR("Nokia Corporation"); +MODULE_DESCRIPTION("ISP170x USB Charger driver"); +MODULE_LICENSE("GPL"); |