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linux/drivers/extcon/extcon-intel-cht-wc.c
Hans de Goede ad49aee401 extcon: intel-cht-wc: Set direction and drv flags for V5 boost GPIO 
Sometimes (firmware bug?) the V5 boost GPIO is not configured as output
by the BIOS, leading to the 5V boost convertor being permanently on,

Explicitly set the direction and drv flags rather then inheriting them
from the firmware to fix this.

Fixes: 585cb239f4 ("extcon: intel-cht-wc: Disable external 5v boost ...")
Cc: stable@vger.kernel.org
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2018-03-21 13:57:52 +09:00

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/*
* Extcon charger detection driver for Intel Cherrytrail Whiskey Cove PMIC
* Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
*
* 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 <linux/extcon-provider.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/intel_soc_pmic.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#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)
#define CHT_WC_VBUS_GPIO_CTLO_DRV_OD BIT(4)
#define CHT_WC_VBUS_GPIO_CTLO_DIR_OUT BIT(5)
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;
/*
* 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.
*/
val = CHT_WC_VBUS_GPIO_CTLO_DRV_OD | CHT_WC_VBUS_GPIO_CTLO_DIR_OUT;
if (enable)
val |= CHT_WC_VBUS_GPIO_CTLO_OUTPUT;
ret = regmap_write(ext->regmap, CHT_WC_VBUS_GPIO_CTLO, 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 <hdegoede@redhat.com>");
MODULE_LICENSE("GPL v2");
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