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extcon: sm5502: Detect cable state after completing platform booting

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This patch detect whether cable is connected or not and the cable type
after completing kernel/platform booting using system_power_efficient_wq.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Chanwoo Choi 2014-05-28 14:21:55 +09:00
parent 914b881f94
commit e1954452f5
1 changed files with 36 additions and 0 deletions
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36
drivers/extcon/extcon-sm5502.c
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@ -28,6 +28,8 @@
#include <linux/extcon.h>
#include <linux/extcon/sm5502.h>
#define DELAY_MS_DEFAULT 17000 /* unit: millisecond */
struct muic_irq {
unsigned int irq;
const char *name;
@ -59,6 +61,14 @@ struct sm5502_muic_info {
unsigned int num_reg_data;
struct mutex mutex;
/*
* Use delayed workqueue to detect cable state and then
* notify cable state to notifiee/platform through uevent.
* After completing the booting of platform, the extcon provider
* driver should notify cable state to upper layer.
*/
struct delayed_work wq_detcable;
};
/* Default value of SM5502 register to bring up MUIC device. */
@ -341,6 +351,8 @@ static int sm5502_muic_cable_handler(struct sm5502_muic_info *info,
case SM5502_MUIC_ADC_OPEN_USB_OTG:
idx = EXTCON_CABLE_USB_HOST;
break;
case SM5502_MUIC_ADC_GROUND:
break;
default:
dev_dbg(info->dev,
"cannot handle this cable_type (0x%x)\n", cable_type);
@ -433,6 +445,18 @@ static irqreturn_t sm5502_muic_irq_handler(int irq, void *data)
return IRQ_HANDLED;
}
static void sm5502_muic_detect_cable_wq(struct work_struct *work)
{
struct sm5502_muic_info *info = container_of(to_delayed_work(work),
struct sm5502_muic_info, wq_detcable);
int ret;
/* Notify the state of connector cable or not */
ret = sm5502_muic_cable_handler(info, true);
if (ret < 0)
dev_warn(info->dev, "failed to detect cable state\n");
}
static void sm5502_init_dev_type(struct sm5502_muic_info *info)
{
unsigned int reg_data, vendor_id, version_id;
@ -546,6 +570,18 @@ static int sm5022_muic_i2c_probe(struct i2c_client *i2c,
return ret;
}
/*
* Detect accessory after completing the initialization of platform
*
* - Use delayed workqueue to detect cable state and then
* notify cable state to notifiee/platform through uevent.
* After completing the booting of platform, the extcon provider
* driver should notify cable state to upper layer.
*/
INIT_DELAYED_WORK(&info->wq_detcable, sm5502_muic_detect_cable_wq);
queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
msecs_to_jiffies(DELAY_MS_DEFAULT));
/* Initialize SM5502 device and print vendor id and version id */
sm5502_init_dev_type(info);