forked from Minki/linux
92b7cb5dc8
Some palmas based chip variants do not have OTG based ID logic. For these variants we rely on GPIO based USB ID detection. These chips do have VBUS comparator for VBUS detection so we continue to use the old way of detecting VBUS. Signed-off-by: Roger Quadros <rogerq@ti.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
389 lines
12 KiB
C
389 lines
12 KiB
C
/*
|
|
* 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/slab.h>
|
|
#include <linux/err.h>
|
|
#include <linux/mfd/palmas.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/of_gpio.h>
|
|
#include <linux/workqueue.h>
|
|
|
|
#define USB_GPIO_DEBOUNCE_MS 20 /* ms */
|
|
|
|
static const unsigned int palmas_extcon_cable[] = {
|
|
EXTCON_USB,
|
|
EXTCON_USB_HOST,
|
|
EXTCON_NONE,
|
|
};
|
|
|
|
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;
|
|
struct extcon_dev *edev = palmas_usb->edev;
|
|
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_(edev, EXTCON_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_(edev, EXTCON_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, id_src;
|
|
struct palmas_usb *palmas_usb = _palmas_usb;
|
|
struct extcon_dev *edev = palmas_usb->edev;
|
|
|
|
palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
|
|
PALMAS_USB_ID_INT_LATCH_SET, &set);
|
|
palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
|
|
PALMAS_USB_ID_INT_SRC, &id_src);
|
|
|
|
if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
|
|
(id_src & 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_(edev, EXTCON_USB_HOST, true);
|
|
dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
|
|
} else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
|
|
(id_src & 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_(edev, EXTCON_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_(edev, EXTCON_USB_HOST, false);
|
|
dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
|
|
} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
|
|
(id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
|
|
palmas_usb->linkstat = PALMAS_USB_STATE_ID;
|
|
extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
|
|
dev_info(palmas_usb->dev, " USB-HOST cable is attached\n");
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void palmas_gpio_id_detect(struct work_struct *work)
|
|
{
|
|
int id;
|
|
struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
|
|
struct palmas_usb,
|
|
wq_detectid);
|
|
struct extcon_dev *edev = palmas_usb->edev;
|
|
|
|
if (!palmas_usb->id_gpiod)
|
|
return;
|
|
|
|
id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);
|
|
|
|
if (id) {
|
|
extcon_set_cable_state_(edev, EXTCON_USB_HOST, false);
|
|
dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
|
|
} else {
|
|
extcon_set_cable_state_(edev, EXTCON_USB_HOST, true);
|
|
dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
|
|
}
|
|
}
|
|
|
|
static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
|
|
{
|
|
struct palmas_usb *palmas_usb = _palmas_usb;
|
|
|
|
queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
|
|
palmas_usb->sw_debounce_jiffies);
|
|
|
|
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);
|
|
|
|
if (palmas_usb->enable_id_detection) {
|
|
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);
|
|
}
|
|
|
|
if (palmas_usb->enable_vbus_detection)
|
|
palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
|
|
|
|
/* cold plug for host mode needs this delay */
|
|
if (palmas_usb->enable_id_detection) {
|
|
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 = dev_get_platdata(&pdev->dev);
|
|
struct device_node *node = pdev->dev.of_node;
|
|
struct palmas_usb *palmas_usb;
|
|
int status;
|
|
|
|
palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
|
|
if (!palmas_usb)
|
|
return -ENOMEM;
|
|
|
|
if (node && !pdata) {
|
|
palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
|
|
palmas_usb->enable_id_detection = of_property_read_bool(node,
|
|
"ti,enable-id-detection");
|
|
palmas_usb->enable_vbus_detection = of_property_read_bool(node,
|
|
"ti,enable-vbus-detection");
|
|
} else {
|
|
palmas_usb->wakeup = true;
|
|
palmas_usb->enable_id_detection = true;
|
|
palmas_usb->enable_vbus_detection = true;
|
|
|
|
if (pdata)
|
|
palmas_usb->wakeup = pdata->wakeup;
|
|
}
|
|
|
|
palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id");
|
|
if (IS_ERR(palmas_usb->id_gpiod)) {
|
|
dev_err(&pdev->dev, "failed to get id gpio\n");
|
|
return PTR_ERR(palmas_usb->id_gpiod);
|
|
}
|
|
|
|
if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
|
|
palmas_usb->enable_id_detection = false;
|
|
palmas_usb->enable_gpio_id_detection = true;
|
|
}
|
|
|
|
if (palmas_usb->enable_gpio_id_detection) {
|
|
u32 debounce;
|
|
|
|
if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
|
|
debounce = USB_GPIO_DEBOUNCE_MS;
|
|
|
|
status = gpiod_set_debounce(palmas_usb->id_gpiod,
|
|
debounce * 1000);
|
|
if (status < 0)
|
|
palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
|
|
}
|
|
|
|
INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect);
|
|
|
|
palmas->usb = palmas_usb;
|
|
palmas_usb->palmas = palmas;
|
|
|
|
palmas_usb->dev = &pdev->dev;
|
|
|
|
palmas_usb_wakeup(palmas, palmas_usb->wakeup);
|
|
|
|
platform_set_drvdata(pdev, palmas_usb);
|
|
|
|
palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
|
|
palmas_extcon_cable);
|
|
if (IS_ERR(palmas_usb->edev)) {
|
|
dev_err(&pdev->dev, "failed to allocate extcon device\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
|
|
if (status) {
|
|
dev_err(&pdev->dev, "failed to register extcon device\n");
|
|
return status;
|
|
}
|
|
|
|
if (palmas_usb->enable_id_detection) {
|
|
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);
|
|
status = devm_request_threaded_irq(palmas_usb->dev,
|
|
palmas_usb->id_irq,
|
|
NULL, palmas_id_irq_handler,
|
|
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
|
|
IRQF_ONESHOT | IRQF_EARLY_RESUME,
|
|
"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);
|
|
return status;
|
|
}
|
|
} else if (palmas_usb->enable_gpio_id_detection) {
|
|
palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
|
|
if (palmas_usb->gpio_id_irq < 0) {
|
|
dev_err(&pdev->dev, "failed to get id irq\n");
|
|
return palmas_usb->gpio_id_irq;
|
|
}
|
|
status = devm_request_threaded_irq(&pdev->dev,
|
|
palmas_usb->gpio_id_irq,
|
|
NULL,
|
|
palmas_gpio_id_irq_handler,
|
|
IRQF_TRIGGER_RISING |
|
|
IRQF_TRIGGER_FALLING |
|
|
IRQF_ONESHOT,
|
|
"palmas_usb_id",
|
|
palmas_usb);
|
|
if (status < 0) {
|
|
dev_err(&pdev->dev,
|
|
"failed to request handler for id irq\n");
|
|
return status;
|
|
}
|
|
}
|
|
|
|
if (palmas_usb->enable_vbus_detection) {
|
|
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);
|
|
status = devm_request_threaded_irq(palmas_usb->dev,
|
|
palmas_usb->vbus_irq, NULL,
|
|
palmas_vbus_irq_handler,
|
|
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
|
|
IRQF_ONESHOT | IRQF_EARLY_RESUME,
|
|
"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);
|
|
return status;
|
|
}
|
|
}
|
|
|
|
palmas_enable_irq(palmas_usb);
|
|
/* perform initial detection */
|
|
palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
|
|
device_set_wakeup_capable(&pdev->dev, true);
|
|
return 0;
|
|
}
|
|
|
|
static int palmas_usb_remove(struct platform_device *pdev)
|
|
{
|
|
struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
|
|
|
|
cancel_delayed_work_sync(&palmas_usb->wq_detectid);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int palmas_usb_suspend(struct device *dev)
|
|
{
|
|
struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
|
|
|
|
if (device_may_wakeup(dev)) {
|
|
if (palmas_usb->enable_vbus_detection)
|
|
enable_irq_wake(palmas_usb->vbus_irq);
|
|
if (palmas_usb->enable_id_detection)
|
|
enable_irq_wake(palmas_usb->id_irq);
|
|
if (palmas_usb->enable_gpio_id_detection)
|
|
enable_irq_wake(palmas_usb->gpio_id_irq);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int palmas_usb_resume(struct device *dev)
|
|
{
|
|
struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
|
|
|
|
if (device_may_wakeup(dev)) {
|
|
if (palmas_usb->enable_vbus_detection)
|
|
disable_irq_wake(palmas_usb->vbus_irq);
|
|
if (palmas_usb->enable_id_detection)
|
|
disable_irq_wake(palmas_usb->id_irq);
|
|
if (palmas_usb->enable_gpio_id_detection)
|
|
disable_irq_wake(palmas_usb->gpio_id_irq);
|
|
}
|
|
return 0;
|
|
};
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
|
|
|
|
static const struct of_device_id of_palmas_match_tbl[] = {
|
|
{ .compatible = "ti,palmas-usb", },
|
|
{ .compatible = "ti,palmas-usb-vid", },
|
|
{ .compatible = "ti,twl6035-usb", },
|
|
{ .compatible = "ti,twl6035-usb-vid", },
|
|
{ /* 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,
|
|
.pm = &palmas_pm_ops,
|
|
},
|
|
};
|
|
|
|
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);
|