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Message-Id: <1348589574-25655-23-git-send-email-mathieu.poirier@linaro.org>
Date: Tue, 25 Sep 2012 10:12:19 -0600
From: mathieu.poirier@...aro.org
To: linux-kernel@...r.kernel.org, cbou@...l.ru, dwmw2@...radead.org
Cc: mathieu.poirier@...aro.org
Subject: [PATCH 22/57] power: AB workaround for invalid charger
From: Henrik Sölver <henrik.solver@...ricsson.com>
AB8500 refuses to start charging when some types of non standard
chargers are connected. This change force the AB to start charging.
Signed-off-by: Henrik Sölver <henrik.solver@...ricsson.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Reviewed-by: Yvan FILLION <yvan.fillion@...ricsson.com>
Reviewed-by: Jonas ABERG <jonas.aberg@...ricsson.com>
---
drivers/power/ab8500_charger.c | 70 +++++++++++++++++++++++++++++++++++++--
1 files changed, 66 insertions(+), 4 deletions(-)
diff --git a/drivers/power/ab8500_charger.c b/drivers/power/ab8500_charger.c
index 7cd4165..cbc9fd7 100644
--- a/drivers/power/ab8500_charger.c
+++ b/drivers/power/ab8500_charger.c
@@ -203,6 +203,7 @@ struct ab8500_charger_usb_state {
* @old_vbat Previously measured battery voltage
* @usb_device_is_unrecognised USB device is unrecognised by the hardware
* @autopower Indicate if we should have automatic pwron after pwrloss
+ * @invalid_charger_detect_state State when forcing AB to use invalid charger
* @parent: Pointer to the struct ab8500
* @gpadc: Pointer to the struct gpadc
* @pdata: Pointer to the abx500_charger platform data
@@ -246,6 +247,7 @@ struct ab8500_charger {
int old_vbat;
bool usb_device_is_unrecognised;
bool autopower;
+ int invalid_charger_detect_state;
struct ab8500 *parent;
struct ab8500_gpadc *gpadc;
struct abx500_charger_platform_data *pdata;
@@ -650,7 +652,6 @@ static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
break;
}
case USB_STAT_HM_IDGND:
- case USB_STAT_NOT_VALID_LINK:
dev_err(di->dev, "USB Type - Charging not allowed\n");
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
ret = -ENXIO;
@@ -679,6 +680,9 @@ static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
di->max_usb_in_curr);
+ case USB_STAT_NOT_VALID_LINK:
+ dev_err(di->dev, "USB Type invalid - try charging anyway\n");
+ di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
break;
default:
@@ -1945,7 +1949,9 @@ static void ab8500_charger_usb_link_attach_work(struct work_struct *work)
*/
static void ab8500_charger_usb_link_status_work(struct work_struct *work)
{
+ int detected_chargers;
int ret;
+ u8 val;
struct ab8500_charger *di = container_of(work,
struct ab8500_charger, usb_link_status_work);
@@ -1955,11 +1961,66 @@ static void ab8500_charger_usb_link_status_work(struct work_struct *work)
* synchronously, we have the check if is
* connected by reading the status register
*/
- ret = ab8500_charger_detect_chargers(di);
- if (ret < 0)
+ detected_chargers = ab8500_charger_detect_chargers(di);
+ if (detected_chargers < 0)
return;
- if (!(ret & USB_PW_CONN)) {
+ /*
+ * Some chargers that breaks the USB spec is
+ * identified as invalid by AB8500 and it refuse
+ * to start the charging process. but by jumping
+ * thru a few hoops it can be forced to start.
+ */
+ ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
+ AB8500_USB_LINE_STAT_REG, &val);
+ if (ret >= 0)
+ dev_dbg(di->dev, "UsbLineStatus register = 0x%02x\n", val);
+ else
+ dev_dbg(di->dev, "Error reading USB link status\n");
+
+ if (detected_chargers & USB_PW_CONN) {
+ if (((val & AB8500_USB_LINK_STATUS) >> 3) ==
+ USB_STAT_NOT_VALID_LINK &&
+ di->invalid_charger_detect_state == 0) {
+ dev_dbg(di->dev,
+ "Invalid charger detected, state= 0\n");
+ /*Enable charger*/
+ abx500_mask_and_set_register_interruptible(di->dev,
+ AB8500_CHARGER,
+ AB8500_USBCH_CTRL1_REG,
+ 0x01, 0x01)
+ /*Enable charger detection*/
+ abx500_mask_and_set_register_interruptible(di->dev,
+ AB8500_USB,
+ AB8500_MCH_IPT_CURLVL_REG,
+ 0x01, 0x01);
+ di->invalid_charger_detect_state = 1;
+ /*exit and wait for new link status interrupt.*/
+ return;
+
+ }
+ if (di->invalid_charger_detect_state == 1) {
+ dev_dbg(di->dev,
+ "Invalid charger detected, state= 1\n");
+ /*Stop charger detection*/
+ abx500_mask_and_set_register_interruptible(di->dev,
+ AB8500_USB,
+ AB8500_MCH_IPT_CURLVL_REG,
+ 0x01, 0x00);
+ /*Check link status*/
+ ret = abx500_get_register_interruptible(di->dev,
+ AB8500_USB,
+ AB8500_USB_LINE_STAT_REG,
+ &val);
+ dev_dbg(di->dev, "USB link status= 0x%02x\n",
+ (val & AB8500_USB_LINK_STATUS) >> 3);
+ di->invalid_charger_detect_state = 2;
+ }
+ } else {
+ di->invalid_charger_detect_state = 0;
+ }
+
+ if (!(detected_chargers & USB_PW_CONN)) {
di->vbus_detected = 0;
ab8500_charger_set_usb_connected(di, false);
ab8500_power_supply_changed(di, &di->usb_chg.psy);
@@ -2862,6 +2923,7 @@ static int __devinit ab8500_charger_probe(struct platform_device *pdev)
}
di->autopower = false;
+ di->invalid_charger_detect_state = 0;
/* AC supply */
/* power_supply base class */
--
1.7.5.4
--
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