Messages in this thread Patch in this message | | | From | Lee Jones <> | Subject | [PATCH 03/18] power: ab8500_charger: Detect removed charger | Date | Thu, 13 Dec 2012 15:21:26 +0000 |
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From: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com> --- drivers/power/ab8500_charger.c | 145 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 144 insertions(+), 1 deletion(-)
diff --git a/drivers/power/ab8500_charger.c b/drivers/power/ab8500_charger.c index d6e1792..8c09444 100644 --- a/drivers/power/ab8500_charger.c +++ b/drivers/power/ab8500_charger.c @@ -31,6 +31,7 @@ #include <linux/mfd/abx500/ab8500-gpadc.h> #include <linux/mfd/abx500/ux500_chargalg.h> #include <linux/usb/otg.h> +#include <linux/mutex.h> /* Charger constants */ #define NO_PW_CONN 0 @@ -68,6 +69,11 @@ #define MAIN_CH_NOK 0x01 #define VBUS_DET 0x80 +#define MAIN_CH_STATUS2_MAINCHGDROP 0x80 +#define MAIN_CH_STATUS2_MAINCHARGERDETDBNC 0x40 +#define USB_CH_VBUSDROP 0x40 +#define USB_CH_VBUSDETDBNC 0x01 + /* UsbLineStatus register bit masks */ #define AB8500_USB_LINK_STATUS 0x78 #define AB8500_STD_HOST_SUSP 0x18 @@ -82,6 +88,8 @@ /* Step up/down delay in us */ #define STEP_UDELAY 1000 +#define CHARGER_STATUS_POLL 10 /* in ms */ + /* UsbLineStatus register - usb types */ enum ab8500_charger_link_status { USB_STAT_NOT_CONFIGURED, @@ -203,6 +211,10 @@ struct ab8500_charger_usb_state { * @check_usbchgnotok_work: Work for checking USB charger not ok status * @kick_wd_work: Work for kicking the charger watchdog in case * of ABB rev 1.* due to the watchog logic bug + * @ac_charger_attached_work: Work for checking if AC charger is still + * connected + * @usb_charger_attached_work: Work for checking if USB charger is still + * connected * @ac_work: Work for checking AC charger connection * @detect_usb_type_work: Work for detecting the USB type connected * @usb_link_status_work: Work for checking the new USB link status @@ -211,6 +223,7 @@ struct ab8500_charger_usb_state { * Work for checking Main thermal status * @check_usb_thermal_prot_work: * Work for checking USB thermal status + * @charger_attached_mutex: For controlling the wakelock */ struct ab8500_charger { struct device *dev; @@ -239,6 +252,8 @@ struct ab8500_charger { struct delayed_work check_hw_failure_work; struct delayed_work check_usbchgnotok_work; struct delayed_work kick_wd_work; + struct delayed_work ac_charger_attached_work; + struct delayed_work usb_charger_attached_work; struct work_struct ac_work; struct work_struct detect_usb_type_work; struct work_struct usb_link_status_work; @@ -247,6 +262,7 @@ struct ab8500_charger { struct work_struct check_usb_thermal_prot_work; struct usb_phy *usb_phy; struct notifier_block nb; + struct mutex charger_attached_mutex; }; /* AC properties */ @@ -349,6 +365,19 @@ static void ab8500_charger_set_usb_connected(struct ab8500_charger *di, dev_dbg(di->dev, "USB connected:%i\n", connected); di->usb.charger_connected = connected; sysfs_notify(&di->usb_chg.psy.dev->kobj, NULL, "present"); + + if (connected) { + mutex_lock(&di->charger_attached_mutex); + mutex_unlock(&di->charger_attached_mutex); + + queue_delayed_work(di->charger_wq, + &di->usb_charger_attached_work, + HZ); + } else { + cancel_delayed_work_sync(&di->usb_charger_attached_work); + mutex_lock(&di->charger_attached_mutex); + mutex_unlock(&di->charger_attached_mutex); + } } } @@ -1706,6 +1735,87 @@ static void ab8500_charger_ac_work(struct work_struct *work) sysfs_notify(&di->ac_chg.psy.dev->kobj, NULL, "present"); } +static void ab8500_charger_usb_attached_work(struct work_struct *work) +{ + int i; + int ret; + u8 statval; + struct ab8500_charger *di = container_of(work, + struct ab8500_charger, + usb_charger_attached_work.work); + + for (i = 0 ; i < 10; i++) { + ret = abx500_get_register_interruptible(di->dev, + AB8500_CHARGER, + AB8500_CH_USBCH_STAT1_REG, + &statval); + if (ret < 0) { + dev_err(di->dev, "ab8500 read failed %d\n", + __LINE__); + goto reschedule; + } + if ((statval & (USB_CH_VBUSDROP | + USB_CH_VBUSDETDBNC)) != + (USB_CH_VBUSDROP | USB_CH_VBUSDETDBNC)) + goto reschedule; + + msleep(CHARGER_STATUS_POLL); + } + + (void) ab8500_charger_usb_en(&di->usb_chg, 0, 0, 0); + + mutex_lock(&di->charger_attached_mutex); + mutex_unlock(&di->charger_attached_mutex); + + return; +reschedule: + queue_delayed_work(di->charger_wq, + &di->usb_charger_attached_work, + HZ); +} + +static void ab8500_charger_ac_attached_work(struct work_struct *work) +{ + + int i; + int ret; + u8 statval; + struct ab8500_charger *di = container_of(work, + struct ab8500_charger, + ac_charger_attached_work.work); + + for (i = 0 ; i < 10; i++) { + ret = abx500_get_register_interruptible(di->dev, + AB8500_CHARGER, + AB8500_CH_STATUS2_REG, + &statval); + if (ret < 0) { + dev_err(di->dev, "ab8500 read failed %d\n", + __LINE__); + goto reschedule; + } + if ((statval & (MAIN_CH_STATUS2_MAINCHGDROP | + MAIN_CH_STATUS2_MAINCHARGERDETDBNC)) != + (MAIN_CH_STATUS2_MAINCHGDROP | + MAIN_CH_STATUS2_MAINCHARGERDETDBNC)) + goto reschedule; + + msleep(CHARGER_STATUS_POLL); + } + + (void) ab8500_charger_ac_en(&di->ac_chg, 0, 0, 0); + queue_work(di->charger_wq, &di->ac_work); + + mutex_lock(&di->charger_attached_mutex); + mutex_unlock(&di->charger_attached_mutex); + + return; +reschedule: + queue_delayed_work(di->charger_wq, + &di->ac_charger_attached_work, + HZ); +} + /** * ab8500_charger_detect_usb_type_work() - work to detect USB type * @work: Pointer to the work_struct structure @@ -1986,6 +2096,10 @@ static irqreturn_t ab8500_charger_mainchunplugdet_handler(int irq, void *_di) dev_dbg(di->dev, "Main charger unplugged\n"); queue_work(di->charger_wq, &di->ac_work); + cancel_delayed_work_sync(&di->ac_charger_attached_work); + mutex_lock(&di->charger_attached_mutex); + mutex_unlock(&di->charger_attached_mutex); + return IRQ_HANDLED; } @@ -2003,6 +2117,11 @@ static irqreturn_t ab8500_charger_mainchplugdet_handler(int irq, void *_di) dev_dbg(di->dev, "Main charger plugged\n"); queue_work(di->charger_wq, &di->ac_work); + mutex_lock(&di->charger_attached_mutex); + mutex_unlock(&di->charger_attached_mutex); + queue_delayed_work(di->charger_wq, + &di->ac_charger_attached_work, + HZ); return IRQ_HANDLED; } @@ -2637,7 +2756,7 @@ static int __devinit ab8500_charger_probe(struct platform_device *pdev) struct device_node *np = pdev->dev.of_node; struct abx500_bm_data *plat = pdev->dev.platform_data; struct ab8500_charger *di; - int irq, i, charger_status, ret = 0; + int irq, i, charger_status, ret = 0, ch_stat; di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL); if (!di) { @@ -2716,12 +2835,19 @@ static int __devinit ab8500_charger_probe(struct platform_device *pdev) return -ENOMEM; } + mutex_init(&di->charger_attached_mutex); + /* Init work for HW failure check */ INIT_DEFERRABLE_WORK(&di->check_hw_failure_work, ab8500_charger_check_hw_failure_work); INIT_DEFERRABLE_WORK(&di->check_usbchgnotok_work, ab8500_charger_check_usbchargernotok_work); + INIT_DELAYED_WORK(&di->ac_charger_attached_work, + ab8500_charger_ac_attached_work); + INIT_DELAYED_WORK(&di->usb_charger_attached_work, + ab8500_charger_usb_attached_work); + /* * For ABB revision 1.0 and 1.1 there is a bug in the watchdog * logic. That means we have to continously kick the charger @@ -2835,6 +2961,23 @@ static int __devinit ab8500_charger_probe(struct platform_device *pdev) platform_set_drvdata(pdev, di); + mutex_lock(&di->charger_attached_mutex); + + ch_stat = ab8500_charger_detect_chargers(di); + + if ((ch_stat & AC_PW_CONN) == AC_PW_CONN) { + queue_delayed_work(di->charger_wq, + &di->ac_charger_attached_work, + HZ); + } + if ((ch_stat & USB_PW_CONN) == USB_PW_CONN) { + queue_delayed_work(di->charger_wq, + &di->usb_charger_attached_work, + HZ); + } + + mutex_unlock(&di->charger_attached_mutex); + return ret; free_irq: -- 1.7.9.5
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