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Commit e1954452 authored by Chanwoo Choi's avatar Chanwoo Choi
Browse files

extcon: sm5502: Detect cable state after completing platform booting 



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: default avatarChanwoo Choi <cw00.choi@samsung.com>
parent 914b881f

drivers/extcon/extcon-sm5502.c

+36 −0
Original line number Diff line number Diff line
@@ -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);