435 lines
13 KiB
C
435 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Palmas USB transceiver driver
|
|
*
|
|
* Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com
|
|
* 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>
|
|
*/
|
|
|
|
#include <linux/devm-helpers.h>
|
|
#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/gpio/consumer.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_state_sync(edev, EXTCON_USB, true);
|
|
dev_dbg(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_state_sync(edev, EXTCON_USB, false);
|
|
dev_dbg(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_state_sync(edev, EXTCON_USB_HOST, true);
|
|
dev_dbg(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_state_sync(edev, EXTCON_USB_HOST, false);
|
|
dev_dbg(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_state_sync(edev, EXTCON_USB_HOST, false);
|
|
dev_dbg(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_state_sync(edev, EXTCON_USB_HOST, true);
|
|
dev_dbg(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_state_sync(edev, EXTCON_USB_HOST, false);
|
|
dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
|
|
} else {
|
|
extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
|
|
dev_dbg(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;
|
|
|
|
if (!palmas) {
|
|
dev_err(&pdev->dev, "failed to get valid parent\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
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",
|
|
GPIOD_IN);
|
|
if (IS_ERR(palmas_usb->id_gpiod))
|
|
return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->id_gpiod),
|
|
"failed to get id gpio\n");
|
|
|
|
palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
|
|
GPIOD_IN);
|
|
if (IS_ERR(palmas_usb->vbus_gpiod))
|
|
return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->vbus_gpiod),
|
|
"failed to get id gpio\n");
|
|
|
|
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_vbus_detection && palmas_usb->vbus_gpiod) {
|
|
palmas_usb->enable_vbus_detection = false;
|
|
palmas_usb->enable_gpio_vbus_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);
|
|
}
|
|
|
|
status = devm_delayed_work_autocancel(&pdev->dev,
|
|
&palmas_usb->wq_detectid,
|
|
palmas_gpio_id_detect);
|
|
if (status)
|
|
return status;
|
|
|
|
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,
|
|
"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,
|
|
"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;
|
|
}
|
|
} else if (palmas_usb->enable_gpio_vbus_detection) {
|
|
/* remux GPIO_1 as VBUSDET */
|
|
status = palmas_update_bits(palmas,
|
|
PALMAS_PU_PD_OD_BASE,
|
|
PALMAS_PRIMARY_SECONDARY_PAD1,
|
|
PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
|
|
(1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
|
|
if (status < 0) {
|
|
dev_err(&pdev->dev, "can't remux GPIO1\n");
|
|
return status;
|
|
}
|
|
|
|
palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
|
|
PALMAS_VBUS_OTG_IRQ);
|
|
palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
|
|
if (palmas_usb->gpio_vbus_irq < 0) {
|
|
dev_err(&pdev->dev, "failed to get vbus irq\n");
|
|
return palmas_usb->gpio_vbus_irq;
|
|
}
|
|
status = devm_request_threaded_irq(&pdev->dev,
|
|
palmas_usb->gpio_vbus_irq,
|
|
NULL,
|
|
palmas_vbus_irq_handler,
|
|
IRQF_TRIGGER_FALLING |
|
|
IRQF_TRIGGER_RISING |
|
|
IRQF_ONESHOT,
|
|
"palmas_usb_vbus",
|
|
palmas_usb);
|
|
if (status < 0) {
|
|
dev_err(&pdev->dev,
|
|
"failed to request handler for vbus irq\n");
|
|
return status;
|
|
}
|
|
}
|
|
|
|
palmas_enable_irq(palmas_usb);
|
|
/* perform initial detection */
|
|
if (palmas_usb->enable_gpio_vbus_detection)
|
|
palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
|
|
palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
|
|
device_set_wakeup_capable(&pdev->dev, true);
|
|
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_gpio_vbus_detection)
|
|
enable_irq_wake(palmas_usb->gpio_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_gpio_vbus_detection)
|
|
disable_irq_wake(palmas_usb->gpio_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);
|
|
}
|
|
|
|
/* check if GPIO states changed while suspend/resume */
|
|
if (palmas_usb->enable_gpio_vbus_detection)
|
|
palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
|
|
palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
|
|
|
|
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,
|
|
.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);
|