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002945f014
linux/drivers/extcon/extcon-palmas.c
Laxman Dewangan 002945f014 extcon: palmas: enable ID_GND and ID_FLOAT detection always 
When integrating driver with Tegra platform, it is found that
the ID pins get detected only once after booting system and
further removal and re-insert does not detect the ID pin.

Fixing this issue with enabling interrupt on ID_GND and ID_FLOAT
always  and clearing the status on LATCH register which actually
occurred.

Also if interrupt occurs with line status as zero then based on
previous status, set the cable state.

Add debug prints to display the cable state when any cable
insertion/removal happen.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Acked-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
2013-08-05 08:53:34 +09:00

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/*
* Palmas USB transceiver driver
*
* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
* 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.
*
* Author: Graeme Gregory <gg@slimlogic.co.uk>
* Author: Kishon Vijay Abraham I <kishon@ti.com>
*
* Based on twl6030_usb.c
*
* Author: Hema HK <hemahk@ti.com>
*
* 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.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/mfd/palmas.h>
#include <linux/of.h>
#include <linux/of_platform.h>
static const char *palmas_extcon_cable[] = {
[0] = "USB",
[1] = "USB-HOST",
NULL,
};
static const int mutually_exclusive[] = {0x3, 0x0};
static void palmas_usb_wakeup(struct palmas *palmas, int enable)
{
if (enable)
palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
else
palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
}
static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
{
struct palmas_usb *palmas_usb = _palmas_usb;
unsigned int vbus_line_state;
palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
PALMAS_INT3_LINE_STATE, &vbus_line_state);
if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
extcon_set_cable_state(&palmas_usb->edev, "USB", true);
dev_info(palmas_usb->dev, "USB cable is attached\n");
} else {
dev_dbg(palmas_usb->dev,
"Spurious connect event detected\n");
}
} else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
extcon_set_cable_state(&palmas_usb->edev, "USB", false);
dev_info(palmas_usb->dev, "USB cable is detached\n");
} else {
dev_dbg(palmas_usb->dev,
"Spurious disconnect event detected\n");
}
}
return IRQ_HANDLED;
}
static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
{
unsigned int set;
struct palmas_usb *palmas_usb = _palmas_usb;
palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
PALMAS_USB_ID_INT_LATCH_SET, &set);
if (set & PALMAS_USB_ID_INT_SRC_ID_GND) {
palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
PALMAS_USB_ID_INT_LATCH_CLR,
PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
palmas_usb->linkstat = PALMAS_USB_STATE_ID;
extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true);
dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
} else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) {
palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
PALMAS_USB_ID_INT_LATCH_CLR,
PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
(!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
}
return IRQ_HANDLED;
}
static void palmas_enable_irq(struct palmas_usb *palmas_usb)
{
palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
PALMAS_USB_VBUS_CTRL_SET,
PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
PALMAS_USB_ID_INT_EN_HI_SET,
PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
/* cold plug for host mode needs this delay */
msleep(30);
palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
}
static int palmas_usb_probe(struct platform_device *pdev)
{
struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
struct palmas_usb_platform_data *pdata = pdev->dev.platform_data;
struct device_node *node = pdev->dev.of_node;
struct palmas_usb *palmas_usb;
int status;
if (node && !pdata) {
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdata->wakeup = of_property_read_bool(node, "ti,wakeup");
} else if (!pdata) {
return -EINVAL;
}
palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
if (!palmas_usb)
return -ENOMEM;
palmas->usb = palmas_usb;
palmas_usb->palmas = palmas;
palmas_usb->dev = &pdev->dev;
palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
PALMAS_ID_OTG_IRQ);
palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
PALMAS_ID_IRQ);
palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
PALMAS_VBUS_OTG_IRQ);
palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
PALMAS_VBUS_IRQ);
palmas_usb_wakeup(palmas, pdata->wakeup);
platform_set_drvdata(pdev, palmas_usb);
palmas_usb->edev.supported_cable = palmas_extcon_cable;
palmas_usb->edev.mutually_exclusive = mutually_exclusive;
status = extcon_dev_register(&palmas_usb->edev, palmas_usb->dev);
if (status) {
dev_err(&pdev->dev, "failed to register extcon device\n");
return status;
}
status = devm_request_threaded_irq(palmas_usb->dev, palmas_usb->id_irq,
NULL, palmas_id_irq_handler,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
"palmas_usb_id", palmas_usb);
if (status < 0) {
dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
palmas_usb->id_irq, status);
goto fail_extcon;
}
status = devm_request_threaded_irq(palmas_usb->dev,
palmas_usb->vbus_irq, NULL, palmas_vbus_irq_handler,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
"palmas_usb_vbus", palmas_usb);
if (status < 0) {
dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
palmas_usb->vbus_irq, status);
goto fail_extcon;
}
palmas_enable_irq(palmas_usb);
return 0;
fail_extcon:
extcon_dev_unregister(&palmas_usb->edev);
return status;
}
static int palmas_usb_remove(struct platform_device *pdev)
{
struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
extcon_dev_unregister(&palmas_usb->edev);
return 0;
}
static struct of_device_id of_palmas_match_tbl[] = {
{ .compatible = "ti,palmas-usb", },
{ .compatible = "ti,twl6035-usb", },
{ /* end */ }
};
static struct platform_driver palmas_usb_driver = {
.probe = palmas_usb_probe,
.remove = palmas_usb_remove,
.driver = {
.name = "palmas-usb",
.of_match_table = of_palmas_match_tbl,
.owner = THIS_MODULE,
},
};
module_platform_driver(palmas_usb_driver);
MODULE_ALIAS("platform:palmas-usb");
MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
MODULE_DESCRIPTION("Palmas USB transceiver driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);
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