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linux/drivers/usb/phy/phy-twl6030-usb.c
Sven Van Asbroeck 5895d311d2 usb: phy: twl6030-usb: fix possible use-after-free on remove 
In remove(), use cancel_delayed_work_sync() to cancel the
delayed work. Otherwise there's a chance that this work
will continue to run until after the device has been removed.

This issue was detected with the help of Coccinelle.

Cc: Tony Lindgren <tony@atomide.com>
Cc: Bin Liu <b-liu@ti.com>
Fixes: b6a619a883 ("usb: phy: Check initial state for twl6030")
Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2019-02-13 13:05:35 +02:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* twl6030_usb - TWL6030 USB transceiver, talking to OMAP OTG driver.
*
* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
*
* Author: Hema HK <hemahk@ti.com>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/usb/musb.h>
#include <linux/usb/phy_companion.h>
#include <linux/phy/omap_usb.h>
#include <linux/mfd/twl.h>
#include <linux/regulator/consumer.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/of.h>
/* usb register definitions */
#define USB_VENDOR_ID_LSB 0x00
#define USB_VENDOR_ID_MSB 0x01
#define USB_PRODUCT_ID_LSB 0x02
#define USB_PRODUCT_ID_MSB 0x03
#define USB_VBUS_CTRL_SET 0x04
#define USB_VBUS_CTRL_CLR 0x05
#define USB_ID_CTRL_SET 0x06
#define USB_ID_CTRL_CLR 0x07
#define USB_VBUS_INT_SRC 0x08
#define USB_VBUS_INT_LATCH_SET 0x09
#define USB_VBUS_INT_LATCH_CLR 0x0A
#define USB_VBUS_INT_EN_LO_SET 0x0B
#define USB_VBUS_INT_EN_LO_CLR 0x0C
#define USB_VBUS_INT_EN_HI_SET 0x0D
#define USB_VBUS_INT_EN_HI_CLR 0x0E
#define USB_ID_INT_SRC 0x0F
#define USB_ID_INT_LATCH_SET 0x10
#define USB_ID_INT_LATCH_CLR 0x11
#define USB_ID_INT_EN_LO_SET 0x12
#define USB_ID_INT_EN_LO_CLR 0x13
#define USB_ID_INT_EN_HI_SET 0x14
#define USB_ID_INT_EN_HI_CLR 0x15
#define USB_OTG_ADP_CTRL 0x16
#define USB_OTG_ADP_HIGH 0x17
#define USB_OTG_ADP_LOW 0x18
#define USB_OTG_ADP_RISE 0x19
#define USB_OTG_REVISION 0x1A
/* to be moved to LDO */
#define TWL6030_MISC2 0xE5
#define TWL6030_CFG_LDO_PD2 0xF5
#define TWL6030_BACKUP_REG 0xFA
#define STS_HW_CONDITIONS 0x21
/* In module TWL6030_MODULE_PM_MASTER */
#define STS_HW_CONDITIONS 0x21
#define STS_USB_ID BIT(2)
/* In module TWL6030_MODULE_PM_RECEIVER */
#define VUSB_CFG_TRANS 0x71
#define VUSB_CFG_STATE 0x72
#define VUSB_CFG_VOLTAGE 0x73
/* in module TWL6030_MODULE_MAIN_CHARGE */
#define CHARGERUSB_CTRL1 0x8
#define CONTROLLER_STAT1 0x03
#define VBUS_DET BIT(2)
struct twl6030_usb {
struct phy_companion comparator;
struct device *dev;
/* for vbus reporting with irqs disabled */
spinlock_t lock;
struct regulator *usb3v3;
/* used to check initial cable status after probe */
struct delayed_work get_status_work;
/* used to set vbus, in atomic path */
struct work_struct set_vbus_work;
int irq1;
int irq2;
enum musb_vbus_id_status linkstat;
u8 asleep;
bool vbus_enable;
};
#define comparator_to_twl(x) container_of((x), struct twl6030_usb, comparator)
/*-------------------------------------------------------------------------*/
static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
u8 data, u8 address)
{
int ret = 0;
ret = twl_i2c_write_u8(module, data, address);
if (ret < 0)
dev_err(twl->dev,
"Write[0x%x] Error %d\n", address, ret);
return ret;
}
static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
{
u8 data;
int ret;
ret = twl_i2c_read_u8(module, &data, address);
if (ret >= 0)
ret = data;
else
dev_err(twl->dev,
"readb[0x%x,0x%x] Error %d\n",
module, address, ret);
return ret;
}
static int twl6030_start_srp(struct phy_companion *comparator)
{
struct twl6030_usb *twl = comparator_to_twl(comparator);
twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);
mdelay(100);
twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);
return 0;
}
static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
{
/* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_BACKUP_REG);
/* Program CFG_LDO_PD2 register and set VUSB bit */
twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_CFG_LDO_PD2);
/* Program MISC2 register and set bit VUSB_IN_VBAT */
twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x10, TWL6030_MISC2);
twl->usb3v3 = regulator_get(twl->dev, "usb");
if (IS_ERR(twl->usb3v3))
return -ENODEV;
/* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
/*
* Program the USB_ID_CTRL_SET register to enable GND drive
* and the ID comparators
*/
twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
return 0;
}
static ssize_t vbus_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct twl6030_usb *twl = dev_get_drvdata(dev);
unsigned long flags;
int ret = -EINVAL;
spin_lock_irqsave(&twl->lock, flags);
switch (twl->linkstat) {
case MUSB_VBUS_VALID:
ret = snprintf(buf, PAGE_SIZE, "vbus\n");
break;
case MUSB_ID_GROUND:
ret = snprintf(buf, PAGE_SIZE, "id\n");
break;
case MUSB_VBUS_OFF:
ret = snprintf(buf, PAGE_SIZE, "none\n");
break;
default:
ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
}
spin_unlock_irqrestore(&twl->lock, flags);
return ret;
}
static DEVICE_ATTR_RO(vbus);
static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
{
struct twl6030_usb *twl = _twl;
enum musb_vbus_id_status status = MUSB_UNKNOWN;
u8 vbus_state, hw_state;
int ret;
hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
CONTROLLER_STAT1);
if (!(hw_state & STS_USB_ID)) {
if (vbus_state & VBUS_DET) {
ret = regulator_enable(twl->usb3v3);
if (ret)
dev_err(twl->dev, "Failed to enable usb3v3\n");
twl->asleep = 1;
status = MUSB_VBUS_VALID;
twl->linkstat = status;
ret = musb_mailbox(status);
if (ret)
twl->linkstat = MUSB_UNKNOWN;
} else {
if (twl->linkstat != MUSB_UNKNOWN) {
status = MUSB_VBUS_OFF;
twl->linkstat = status;
ret = musb_mailbox(status);
if (ret)
twl->linkstat = MUSB_UNKNOWN;
if (twl->asleep) {
regulator_disable(twl->usb3v3);
twl->asleep = 0;
}
}
}
}
sysfs_notify(&twl->dev->kobj, NULL, "vbus");
return IRQ_HANDLED;
}
static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
{
struct twl6030_usb *twl = _twl;
enum musb_vbus_id_status status = MUSB_UNKNOWN;
u8 hw_state;
int ret;
hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
if (hw_state & STS_USB_ID) {
ret = regulator_enable(twl->usb3v3);
if (ret)
dev_err(twl->dev, "Failed to enable usb3v3\n");
twl->asleep = 1;
twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR);
twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET);
status = MUSB_ID_GROUND;
twl->linkstat = status;
ret = musb_mailbox(status);
if (ret)
twl->linkstat = MUSB_UNKNOWN;
} else {
twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR);
twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
}
twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR);
return IRQ_HANDLED;
}
static void twl6030_status_work(struct work_struct *work)
{
struct twl6030_usb *twl = container_of(work, struct twl6030_usb,
get_status_work.work);
twl6030_usb_irq(twl->irq2, twl);
twl6030_usbotg_irq(twl->irq1, twl);
}
static int twl6030_enable_irq(struct twl6030_usb *twl)
{
twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
REG_INT_MSK_LINE_C);
twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
REG_INT_MSK_STS_C);
return 0;
}
static void otg_set_vbus_work(struct work_struct *data)
{
struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
set_vbus_work);
/*
* Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
* register. This enables boost mode.
*/
if (twl->vbus_enable)
twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x40,
CHARGERUSB_CTRL1);
else
twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x00,
CHARGERUSB_CTRL1);
}
static int twl6030_set_vbus(struct phy_companion *comparator, bool enabled)
{
struct twl6030_usb *twl = comparator_to_twl(comparator);
twl->vbus_enable = enabled;
schedule_work(&twl->set_vbus_work);
return 0;
}
static int twl6030_usb_probe(struct platform_device *pdev)
{
u32 ret;
struct twl6030_usb *twl;
int status, err;
struct device_node *np = pdev->dev.of_node;
struct device *dev = &pdev->dev;
if (!np) {
dev_err(dev, "no DT info\n");
return -EINVAL;
}
twl = devm_kzalloc(dev, sizeof(*twl), GFP_KERNEL);
if (!twl)
return -ENOMEM;
twl->dev = &pdev->dev;
twl->irq1 = platform_get_irq(pdev, 0);
twl->irq2 = platform_get_irq(pdev, 1);
twl->linkstat = MUSB_UNKNOWN;
twl->comparator.set_vbus = twl6030_set_vbus;
twl->comparator.start_srp = twl6030_start_srp;
ret = omap_usb2_set_comparator(&twl->comparator);
if (ret == -ENODEV) {
dev_info(&pdev->dev, "phy not ready, deferring probe");
return -EPROBE_DEFER;
}
/* init spinlock for workqueue */
spin_lock_init(&twl->lock);
err = twl6030_usb_ldo_init(twl);
if (err) {
dev_err(&pdev->dev, "ldo init failed\n");
return err;
}
platform_set_drvdata(pdev, twl);
if (device_create_file(&pdev->dev, &dev_attr_vbus))
dev_warn(&pdev->dev, "could not create sysfs file\n");
INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
INIT_DELAYED_WORK(&twl->get_status_work, twl6030_status_work);
status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
"twl6030_usb", twl);
if (status < 0) {
dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
twl->irq1, status);
device_remove_file(twl->dev, &dev_attr_vbus);
return status;
}
status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
"twl6030_usb", twl);
if (status < 0) {
dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
twl->irq2, status);
free_irq(twl->irq1, twl);
device_remove_file(twl->dev, &dev_attr_vbus);
return status;
}
twl->asleep = 0;
twl6030_enable_irq(twl);
schedule_delayed_work(&twl->get_status_work, HZ);
dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
return 0;
}
static int twl6030_usb_remove(struct platform_device *pdev)
{
struct twl6030_usb *twl = platform_get_drvdata(pdev);
cancel_delayed_work_sync(&twl->get_status_work);
twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
REG_INT_MSK_LINE_C);
twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
REG_INT_MSK_STS_C);
free_irq(twl->irq1, twl);
free_irq(twl->irq2, twl);
regulator_put(twl->usb3v3);
device_remove_file(twl->dev, &dev_attr_vbus);
cancel_work_sync(&twl->set_vbus_work);
return 0;
}
static const struct of_device_id twl6030_usb_id_table[] = {
{ .compatible = "ti,twl6030-usb" },
{}
};
MODULE_DEVICE_TABLE(of, twl6030_usb_id_table);
static struct platform_driver twl6030_usb_driver = {
.probe = twl6030_usb_probe,
.remove = twl6030_usb_remove,
.driver = {
.name = "twl6030_usb",
.of_match_table = of_match_ptr(twl6030_usb_id_table),
},
};
static int __init twl6030_usb_init(void)
{
return platform_driver_register(&twl6030_usb_driver);
}
subsys_initcall(twl6030_usb_init);
static void __exit twl6030_usb_exit(void)
{
platform_driver_unregister(&twl6030_usb_driver);
}
module_exit(twl6030_usb_exit);
MODULE_ALIAS("platform:twl6030_usb");
MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
MODULE_LICENSE("GPL");
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