/* * Extcon charger detection driver for Intel Cherrytrail Whiskey Cove PMIC * Copyright (C) 2017 Hans de Goede * * Based on various non upstream patches to support the CHT Whiskey Cove PMIC: * Copyright (C) 2013-2015 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope 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. */ #include #include #include #include #include #include #include #include #define CHT_WC_PHYCTRL 0x5e07 #define CHT_WC_CHGRCTRL0 0x5e16 #define CHT_WC_CHGRCTRL0_CHGRRESET BIT(0) #define CHT_WC_CHGRCTRL0_EMRGCHREN BIT(1) #define CHT_WC_CHGRCTRL0_EXTCHRDIS BIT(2) #define CHT_WC_CHGRCTRL0_SWCONTROL BIT(3) #define CHT_WC_CHGRCTRL0_TTLCK_MASK BIT(4) #define CHT_WC_CHGRCTRL0_CCSM_OFF_MASK BIT(5) #define CHT_WC_CHGRCTRL0_DBPOFF_MASK BIT(6) #define CHT_WC_CHGRCTRL0_WDT_NOKICK BIT(7) #define CHT_WC_CHGRCTRL1 0x5e17 #define CHT_WC_USBSRC 0x5e29 #define CHT_WC_USBSRC_STS_MASK GENMASK(1, 0) #define CHT_WC_USBSRC_STS_SUCCESS 2 #define CHT_WC_USBSRC_STS_FAIL 3 #define CHT_WC_USBSRC_TYPE_SHIFT 2 #define CHT_WC_USBSRC_TYPE_MASK GENMASK(5, 2) #define CHT_WC_USBSRC_TYPE_NONE 0 #define CHT_WC_USBSRC_TYPE_SDP 1 #define CHT_WC_USBSRC_TYPE_DCP 2 #define CHT_WC_USBSRC_TYPE_CDP 3 #define CHT_WC_USBSRC_TYPE_ACA 4 #define CHT_WC_USBSRC_TYPE_SE1 5 #define CHT_WC_USBSRC_TYPE_MHL 6 #define CHT_WC_USBSRC_TYPE_FLOAT_DP_DN 7 #define CHT_WC_USBSRC_TYPE_OTHER 8 #define CHT_WC_USBSRC_TYPE_DCP_EXTPHY 9 #define CHT_WC_PWRSRC_IRQ 0x6e03 #define CHT_WC_PWRSRC_IRQ_MASK 0x6e0f #define CHT_WC_PWRSRC_STS 0x6e1e #define CHT_WC_PWRSRC_VBUS BIT(0) #define CHT_WC_PWRSRC_DC BIT(1) #define CHT_WC_PWRSRC_BAT BIT(2) #define CHT_WC_PWRSRC_ID_GND BIT(3) #define CHT_WC_PWRSRC_ID_FLOAT BIT(4) #define CHT_WC_VBUS_GPIO_CTLO 0x6e2d #define CHT_WC_VBUS_GPIO_CTLO_OUTPUT BIT(0) enum cht_wc_usb_id { USB_ID_OTG, USB_ID_GND, USB_ID_FLOAT, USB_RID_A, USB_RID_B, USB_RID_C, }; enum cht_wc_mux_select { MUX_SEL_PMIC = 0, MUX_SEL_SOC, }; static const unsigned int cht_wc_extcon_cables[] = { EXTCON_USB, EXTCON_USB_HOST, EXTCON_CHG_USB_SDP, EXTCON_CHG_USB_CDP, EXTCON_CHG_USB_DCP, EXTCON_CHG_USB_ACA, EXTCON_NONE, }; struct cht_wc_extcon_data { struct device *dev; struct regmap *regmap; struct extcon_dev *edev; unsigned int previous_cable; bool usb_host; }; static int cht_wc_extcon_get_id(struct cht_wc_extcon_data *ext, int pwrsrc_sts) { if (pwrsrc_sts & CHT_WC_PWRSRC_ID_GND) return USB_ID_GND; if (pwrsrc_sts & CHT_WC_PWRSRC_ID_FLOAT) return USB_ID_FLOAT; /* * Once we have iio support for the gpadc we should read the USBID * gpadc channel here and determine ACA role based on that. */ return USB_ID_FLOAT; } static int cht_wc_extcon_get_charger(struct cht_wc_extcon_data *ext, bool ignore_errors) { int ret, usbsrc, status; unsigned long timeout; /* Charger detection can take upto 600ms, wait 800ms max. */ timeout = jiffies + msecs_to_jiffies(800); do { ret = regmap_read(ext->regmap, CHT_WC_USBSRC, &usbsrc); if (ret) { dev_err(ext->dev, "Error reading usbsrc: %d\n", ret); return ret; } status = usbsrc & CHT_WC_USBSRC_STS_MASK; if (status == CHT_WC_USBSRC_STS_SUCCESS || status == CHT_WC_USBSRC_STS_FAIL) break; msleep(50); /* Wait a bit before retrying */ } while (time_before(jiffies, timeout)); if (status != CHT_WC_USBSRC_STS_SUCCESS) { if (ignore_errors) return EXTCON_CHG_USB_SDP; /* Save fallback */ if (status == CHT_WC_USBSRC_STS_FAIL) dev_warn(ext->dev, "Could not detect charger type\n"); else dev_warn(ext->dev, "Timeout detecting charger type\n"); return EXTCON_CHG_USB_SDP; /* Save fallback */ } usbsrc = (usbsrc & CHT_WC_USBSRC_TYPE_MASK) >> CHT_WC_USBSRC_TYPE_SHIFT; switch (usbsrc) { default: dev_warn(ext->dev, "Unhandled charger type %d, defaulting to SDP\n", ret); /* Fall through, treat as SDP */ case CHT_WC_USBSRC_TYPE_SDP: case CHT_WC_USBSRC_TYPE_FLOAT_DP_DN: case CHT_WC_USBSRC_TYPE_OTHER: return EXTCON_CHG_USB_SDP; case CHT_WC_USBSRC_TYPE_CDP: return EXTCON_CHG_USB_CDP; case CHT_WC_USBSRC_TYPE_DCP: case CHT_WC_USBSRC_TYPE_DCP_EXTPHY: case CHT_WC_USBSRC_TYPE_MHL: /* MHL2+ delivers upto 2A, treat as DCP */ return EXTCON_CHG_USB_DCP; case CHT_WC_USBSRC_TYPE_ACA: return EXTCON_CHG_USB_ACA; } } static void cht_wc_extcon_set_phymux(struct cht_wc_extcon_data *ext, u8 state) { int ret; ret = regmap_write(ext->regmap, CHT_WC_PHYCTRL, state); if (ret) dev_err(ext->dev, "Error writing phyctrl: %d\n", ret); } static void cht_wc_extcon_set_5v_boost(struct cht_wc_extcon_data *ext, bool enable) { int ret, val; val = enable ? CHT_WC_VBUS_GPIO_CTLO_OUTPUT : 0; /* * The 5V boost converter is enabled through a gpio on the PMIC, since * there currently is no gpio driver we access the gpio reg directly. */ ret = regmap_update_bits(ext->regmap, CHT_WC_VBUS_GPIO_CTLO, CHT_WC_VBUS_GPIO_CTLO_OUTPUT, val); if (ret) dev_err(ext->dev, "Error writing Vbus GPIO CTLO: %d\n", ret); } /* Small helper to sync EXTCON_CHG_USB_SDP and EXTCON_USB state */ static void cht_wc_extcon_set_state(struct cht_wc_extcon_data *ext, unsigned int cable, bool state) { extcon_set_state_sync(ext->edev, cable, state); if (cable == EXTCON_CHG_USB_SDP) extcon_set_state_sync(ext->edev, EXTCON_USB, state); } static void cht_wc_extcon_pwrsrc_event(struct cht_wc_extcon_data *ext) { int ret, pwrsrc_sts, id; unsigned int cable = EXTCON_NONE; /* Ignore errors in host mode, as the 5v boost converter is on then */ bool ignore_get_charger_errors = ext->usb_host; ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_STS, &pwrsrc_sts); if (ret) { dev_err(ext->dev, "Error reading pwrsrc status: %d\n", ret); return; } id = cht_wc_extcon_get_id(ext, pwrsrc_sts); if (id == USB_ID_GND) { /* The 5v boost causes a false VBUS / SDP detect, skip */ goto charger_det_done; } /* Plugged into a host/charger or not connected? */ if (!(pwrsrc_sts & CHT_WC_PWRSRC_VBUS)) { /* Route D+ and D- to PMIC for future charger detection */ cht_wc_extcon_set_phymux(ext, MUX_SEL_PMIC); goto set_state; } ret = cht_wc_extcon_get_charger(ext, ignore_get_charger_errors); if (ret >= 0) cable = ret; charger_det_done: /* Route D+ and D- to SoC for the host or gadget controller */ cht_wc_extcon_set_phymux(ext, MUX_SEL_SOC); set_state: if (cable != ext->previous_cable) { cht_wc_extcon_set_state(ext, cable, true); cht_wc_extcon_set_state(ext, ext->previous_cable, false); ext->previous_cable = cable; } ext->usb_host = ((id == USB_ID_GND) || (id == USB_RID_A)); extcon_set_state_sync(ext->edev, EXTCON_USB_HOST, ext->usb_host); } static irqreturn_t cht_wc_extcon_isr(int irq, void *data) { struct cht_wc_extcon_data *ext = data; int ret, irqs; ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_IRQ, &irqs); if (ret) { dev_err(ext->dev, "Error reading irqs: %d\n", ret); return IRQ_NONE; } cht_wc_extcon_pwrsrc_event(ext); ret = regmap_write(ext->regmap, CHT_WC_PWRSRC_IRQ, irqs); if (ret) { dev_err(ext->dev, "Error writing irqs: %d\n", ret); return IRQ_NONE; } return IRQ_HANDLED; } static int cht_wc_extcon_sw_control(struct cht_wc_extcon_data *ext, bool enable) { int ret, mask, val; mask = CHT_WC_CHGRCTRL0_SWCONTROL | CHT_WC_CHGRCTRL0_CCSM_OFF_MASK; val = enable ? mask : 0; ret = regmap_update_bits(ext->regmap, CHT_WC_CHGRCTRL0, mask, val); if (ret) dev_err(ext->dev, "Error setting sw control: %d\n", ret); return ret; } static int cht_wc_extcon_probe(struct platform_device *pdev) { struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent); struct cht_wc_extcon_data *ext; int irq, ret; irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; ext = devm_kzalloc(&pdev->dev, sizeof(*ext), GFP_KERNEL); if (!ext) return -ENOMEM; ext->dev = &pdev->dev; ext->regmap = pmic->regmap; ext->previous_cable = EXTCON_NONE; /* Initialize extcon device */ ext->edev = devm_extcon_dev_allocate(ext->dev, cht_wc_extcon_cables); if (IS_ERR(ext->edev)) return PTR_ERR(ext->edev); /* * When a host-cable is detected the BIOS enables an external 5v boost * converter to power connected devices there are 2 problems with this: * 1) This gets seen by the external battery charger as a valid Vbus * supply and it then tries to feed Vsys from this creating a * feedback loop which causes aprox. 300 mA extra battery drain * (and unless we drive the external-charger-disable pin high it * also tries to charge the battery causing even more feedback). * 2) This gets seen by the pwrsrc block as a SDP USB Vbus supply * Since the external battery charger has its own 5v boost converter * which does not have these issues, we simply turn the separate * external 5v boost converter off and leave it off entirely. */ cht_wc_extcon_set_5v_boost(ext, false); /* Enable sw control */ ret = cht_wc_extcon_sw_control(ext, true); if (ret) return ret; /* Register extcon device */ ret = devm_extcon_dev_register(ext->dev, ext->edev); if (ret) { dev_err(ext->dev, "Error registering extcon device: %d\n", ret); goto disable_sw_control; } /* Route D+ and D- to PMIC for initial charger detection */ cht_wc_extcon_set_phymux(ext, MUX_SEL_PMIC); /* Get initial state */ cht_wc_extcon_pwrsrc_event(ext); ret = devm_request_threaded_irq(ext->dev, irq, NULL, cht_wc_extcon_isr, IRQF_ONESHOT, pdev->name, ext); if (ret) { dev_err(ext->dev, "Error requesting interrupt: %d\n", ret); goto disable_sw_control; } /* Unmask irqs */ ret = regmap_write(ext->regmap, CHT_WC_PWRSRC_IRQ_MASK, (int)~(CHT_WC_PWRSRC_VBUS | CHT_WC_PWRSRC_ID_GND | CHT_WC_PWRSRC_ID_FLOAT)); if (ret) { dev_err(ext->dev, "Error writing irq-mask: %d\n", ret); goto disable_sw_control; } platform_set_drvdata(pdev, ext); return 0; disable_sw_control: cht_wc_extcon_sw_control(ext, false); return ret; } static int cht_wc_extcon_remove(struct platform_device *pdev) { struct cht_wc_extcon_data *ext = platform_get_drvdata(pdev); cht_wc_extcon_sw_control(ext, false); return 0; } static const struct platform_device_id cht_wc_extcon_table[] = { { .name = "cht_wcove_pwrsrc" }, {}, }; MODULE_DEVICE_TABLE(platform, cht_wc_extcon_table); static struct platform_driver cht_wc_extcon_driver = { .probe = cht_wc_extcon_probe, .remove = cht_wc_extcon_remove, .id_table = cht_wc_extcon_table, .driver = { .name = "cht_wcove_pwrsrc", }, }; module_platform_driver(cht_wc_extcon_driver); MODULE_DESCRIPTION("Intel Cherrytrail Whiskey Cove PMIC extcon driver"); MODULE_AUTHOR("Hans de Goede "); MODULE_LICENSE("GPL v2");