396 строки
11 KiB
C
396 строки
11 KiB
C
/*
|
|
* 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)
|
|
|
|
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 <hdegoede@redhat.com>");
|
|
MODULE_LICENSE("GPL v2");
|