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/*
* Copyright 2004-2012 Freescale Semiconductor, Inc. All Rights Reserved.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
/*
* NOTICE: Currently, it only supports i.mx6q usb charger detect
*/
static void my_batt_ext_power_changed(struct power_supply *psy)
{
int mA;
union power_supply_propval ret = {0,};
printk(KERN_INFO "my_batt_ext_power_changed!\n");
if (!power_supply_am_i_supplied(psy)) {
/* stop charging */
printk(KERN_ERR "It is not usb supply!\n");
return;
}
power_supply_get_supplier_property(psy,
POWER_SUPPLY_PROP_ONLINE, &ret);
printk(KERN_INFO "imx6 usb charger online:%d\n", ret.intval);
power_supply_get_supplier_property(psy,
POWER_SUPPLY_PROP_CURRENT_MAX, &ret);
/* maximum milliamps we are allowed to draw from VBUS */
mA = ret.intval;
printk(KERN_INFO "imx6 usb charger limit mA: %d\n", mA);
}
static int usb_charger_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct usb_charger *charger =
container_of(psy, struct usb_charger, psy);
switch (psp) {
case POWER_SUPPLY_PROP_PRESENT:
val->intval = charger->present;
break;
case POWER_SUPPLY_PROP_ONLINE:
val->intval = charger->online;
break;
case POWER_SUPPLY_PROP_CURRENT_MAX:
val->intval = charger->max_current;
break;
default:
return -EINVAL;
}
return 0;
}
static void usb_charger_work(struct work_struct *data)
{
int ret;
struct usb_charger *charger =
container_of(data, struct usb_charger, work);
if (!charger->online)
return;
mutex_lock(&charger->lock);
/* Start the primary charger detection. */
if (charger->detect) {
ret = charger->detect(charger);
if (ret <= 0)
dev_err(charger->dev, "Error occurs during usb charger \
detection\n");
else
charger->present = ret;
}
switch (charger->psy.type) {
case POWER_SUPPLY_TYPE_USB_DCP:
charger->max_current = 1500;
break;
case POWER_SUPPLY_TYPE_USB_CDP:
charger->max_current = 900;
break;
case POWER_SUPPLY_TYPE_USB: /* SDP */
charger->max_current = 500;
default:
if (charger->dp_pullup)
charger->dp_pullup(true);
break;
}
power_supply_changed(&charger->psy);
mutex_unlock(&charger->lock);
}
/* Return value if the charger is present */
static int usb_charger_detect(struct usb_charger *charger)
{
void __iomem *addr = charger->charger_base_addr;
int i;
BUG_ON(!addr);
/* Enable the vdd3p0 curret limiter */
writel(BM_ANADIG_REG_3P0_ENABLE_LINREG |
BM_ANADIG_REG_3P0_ENABLE_ILIMIT,
addr + HW_ANADIG_REG_3P0_SET);
/* check if vbus is valid */
if (!(readl(addr + HW_ANADIG_USB1_VBUS_DET_STAT) &
BM_ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID)) {
dev_err(charger->dev, "vbus is error\n");
return 0;
}
/* Enable charger detector */
writel(BM_ANADIG_USB1_CHRG_DETECT_EN_B,
addr + HW_ANADIG_USB1_CHRG_DETECT_CLR);
/*
* - Do not check whether a charger is connected to the USB port
* - Check whether the USB plug has been in contact with each other
*/
writel(BM_ANADIG_USB1_CHRG_DETECT_CHK_CONTACT
| BM_ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B,
addr + HW_ANADIG_USB1_CHRG_DETECT_SET);
/* Check if plug is connected */
for (i = 0; i < 1000; i = i + 1) {
if (readl(addr + HW_ANADIG_USB1_CHRG_DET_STAT) &
BM_ANADIG_USB1_CHRG_DET_STAT_PLUG_CONTACT) {
dev_dbg(charger->dev, "Plug Contact = 1\n");
break;
} else if (i > 800) {
dev_err(charger->dev, "VBUS is coming from a dedicated power supply.\n");
return 0;
} else
msleep(1);
}
/*
* - Do check whether a charger is connected to the USB port
* - Do not Check whether the USB plug has been in contact with each other
*/
writel(BM_ANADIG_USB1_CHRG_DETECT_CHK_CONTACT
| BM_ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B,
addr + HW_ANADIG_USB1_CHRG_DETECT_CLR);
msleep(40);
/* Check if it is a charger */
if (!(readl(addr + HW_ANADIG_USB1_CHRG_DET_STAT) &
BM_ANADIG_USB1_CHRG_DET_STAT_CHRG_DETECTED)) {
dev_info(charger->dev, "It is a stardard downstream port\n");
charger->psy.type = POWER_SUPPLY_TYPE_USB;
/* Disable Charger detector */
writel(BM_ANADIG_USB1_CHRG_DETECT_EN_B
| BM_ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B,
addr + HW_ANADIG_USB1_CHRG_DETECT);
/* Disable the vdd3p0 curret limiter */
writel(BM_ANADIG_REG_3P0_ENABLE_ILIMIT,
addr + HW_ANADIG_REG_3P0_CLR);
return 1;
}
/* Begin to detect CDP and DCP */
/* Disable Charger detector */
writel(BM_ANADIG_USB1_CHRG_DETECT_EN_B
| BM_ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B,
addr + HW_ANADIG_USB1_CHRG_DETECT);
msleep(40);
/* Disable the vdd3p0 curret limiter */
writel(BM_ANADIG_REG_3P0_ENABLE_ILIMIT,
addr + HW_ANADIG_REG_3P0_CLR);
/* pull up dp */
if (charger->dp_pullup)
charger->dp_pullup(true);
msleep(40);
if ((readl(&dr_regs->portsc1) & PORTSCX_LINE_STATUS_KSTATE)) {
dev_info(charger->dev, "It is a dedicate charging port\n");
charger->psy.type = POWER_SUPPLY_TYPE_USB_DCP;
} else {
dev_info(charger->dev, "It is a charging downstream port\n");
charger->psy.type = POWER_SUPPLY_TYPE_USB_CDP;
}
return 1;
}
static void usb_charger_init(struct usb_charger *charger)
{
charger->bc = BATTERY_CHARGING_SPEC_1_2;
charger->detect = usb_charger_detect;
}
/*
* imx_usb_create_charger - create a USB charger
* @charger: the charger to be initialized
* @name: name for the power supply
* Registers a power supply for the charger. The PHY/UDC driver will
* call this after filling struct usb_charger. All the users are
* expected to be in the supplied_to parameter.
*/
int imx_usb_create_charger(struct usb_charger *charger,
const char *name)
{
int ret = 0;
struct power_supply *psy = &charger->psy;
if (!charger->dev)
return -EINVAL;
if (name)
psy->name = name;
else
psy->name = "usb_charger";
usb_charger_init(charger);
psy->type = POWER_SUPPLY_TYPE_USB;
psy->properties = power_props;
psy->num_properties = ARRAY_SIZE(power_props);
psy->get_property = usb_charger_get_property;
psy->supplied_to = usb_charger_supplied_to;
psy->num_supplicants = sizeof(usb_charger_supplied_to)/sizeof(char *);
psy->external_power_changed = my_batt_ext_power_changed;
ret = power_supply_register(charger->dev, psy);
if (ret)
goto fail;
mutex_init(&charger->lock);
INIT_WORK(&charger->work, usb_charger_work);
fail:
return ret;
}
EXPORT_SYMBOL(imx_usb_create_charger);
/*
* imx_usb_remove_charger - remove a USB charger
* @charger: the charger to be removed
*
* Unregister the chargers power supply.
*/
void imx_usb_remove_charger(struct usb_charger *charger)
{
power_supply_unregister(&charger->psy);
}
EXPORT_SYMBOL(imx_usb_remove_charger);
/*
* imx_usb_set_power - Set the maximum power allowed to draw
* @charger: the usb charger
* @mA: maximum current in milliamps
*
* Called from the controller after enumeration to inform the maximum
* power from the configuration, and after bus suspend and resume.
*/
int imx_usb_set_power(struct usb_charger *charger, unsigned mA)
{
if (!charger->online)
return 0;
if (charger->max_current == mA)
return 0;
charger->max_current = mA;
power_supply_changed(&charger->psy);
return 0;
}
EXPORT_SYMBOL(imx_usb_set_power);
/*
* imx_usb_vbus_connect - inform about VBUS connection
* @charger: the usb charger
*
* Inform the charger VBUS is connected. The USB device controller is
* expected to keep the dataline pullups disabled until dp_pullup()
* is called.
*/
int imx_usb_vbus_connect(struct usb_charger *charger)
{
/* if charger is disabled, set usbcmd.rs=1 and return directly */
if (!charger->enable) {
if (charger->dp_pullup)
charger->dp_pullup(true);
return 0;
}
charger->online = 1;
schedule_work(&charger->work);
return 0;
}
EXPORT_SYMBOL(imx_usb_vbus_connect);
/*
* imx_usb_vbus_disconnect - inform about VBUS disconnection
* @charger: the usb charger
*
* Inform the charger that VBUS is disconnected. The charging will be
* stopped and the charger properties cleared.
*/
int imx_usb_vbus_disconnect(struct usb_charger *charger)
{
if (!charger->enable)
return 0;
/* in case, the charger detect is doing or pending */
cancel_work_sync(&charger->work);
charger->online = 0;
charger->present = 0;
charger->max_current = 0;
charger->psy.type = POWER_SUPPLY_TYPE_USB;
if (charger->disconnect)
charger->disconnect(charger);
power_supply_changed(&charger->psy);
return 0;
}
EXPORT_SYMBOL(imx_usb_vbus_disconnect);
|
