/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include /* 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");