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Commit 879904a2 authored by Rohit Vaswani's avatar Rohit Vaswani
Browse files

msm: pp2s: Add sysfs node to cause reset of time 



Add a sysfs node to reset a newly recalculated time from user space.

Change-Id: I3b68d078689c26ef71cdebe3973bc5283144b3fa
Acked-by: default avatarPerry Randise <prandise@qti.qualcomm.com>
Signed-off-by: default avatarRohit Vaswani <rvaswani@codeaurora.org>
parent c77af294

arch/arm/mach-msm/pp2s.c

+45 −10
Original line number Diff line number Diff line
@@ -35,7 +35,7 @@ 
 */

#define NUM_PP2S_SYSFS_REG_NODES 1



#define NUM_WC_SYSFS_REG_NODES 6

#define NUM_WC_SYSFS_REG_NODES 7



#define ATTR_PTR_SIZE sizeof(struct attribute *)
@@ -70,7 +70,7 @@ 
/*

 * The difference (in seconds) between the unix and gps epochs...

 */

#define UNIX_EPOCH_TO_GPS_EPOCH_GAP 315964819

#define UNIX_EPOCH_TO_GPS_EPOCH_GAP 315964800



/*

 * These macros assist with creating sysfs attributes...
@@ -127,6 +127,8 @@ struct wc_sysfs_t { 
	u32                    clockcnt_reg;

	struct kobj_attribute  kobj_attr_snapshot_reg;

	u32                    snapshot_reg;

	struct kobj_attribute  kobj_attr_reset_time;

	u32                    reset_time;

};



/*
@@ -137,6 +139,7 @@ static struct pp2s_sysfs_t pp2s_sysfs; 
static struct workqueue_struct *workqueue;

static struct work_struct       bottom_work;

static struct wc_sysfs_t        wc_sysfs;

static int                      time_is_set = -1;



/*

 * The following will be set to point at the two regions where the
@@ -211,10 +214,9 @@ static void gps_to_unix_time( 
	nsecs <<= 4;



	/*

	 * Convert PP2S pules to seconds and add that in. NOTE: The first

	 * pulse ignored, since it's the epoch...

	 * Convert PP2S pulses to seconds and add that in.

	 */

	secs += ((pulses - 1) * 2);

	secs += (pulses * 2);



	/*

	 * Now convert the free running clock into seconds and nanoseconds
@@ -450,6 +452,40 @@ static ssize_t write_snapshot_reg( 
	return register_write(__func__, WC_SNAPSHOT_ADDR, buf);

}



/*

 * The sysfs routine which is called when an application issues a read

 * on the reset_time sysfs node...

 */

static ssize_t read_reset_time(

	struct kobject        *kobj,

	struct kobj_attribute *attr,

	char                  *buf)

{

	LOG_DRVR_DEBUG("Entering %s\n", __func__);



	return scnprintf(buf,

			 PAGE_SIZE,

			 "linux time is %s",

			 (time_is_set > 0) ? "set" : "not set");

}



/*

 * The sysfs routine which is called when an application issues a

 * write on the reset_time sysfs node...

 */

static ssize_t write_reset_time(

	struct kobject        *kobj,

	struct kobj_attribute *attr,

	const char            *buf,

	size_t                 count)

{

	LOG_DRVR_DEBUG("Entering %s\n", __func__);



	time_is_set = -1;



	return 1;

}



/*

 * The sysfs routine which is called when an application issues a read

 * on the pp2s_cnt sysfs node...
@@ -472,8 +508,6 @@ static ssize_t read_pp2s_cnt( 
static void pp2s_intr_bottom(

	struct work_struct *work)

{

	static int done = -1;



	LOG_DRVR_DEBUG("Entering %s\n", __func__);



	/*
@@ -482,11 +516,11 @@ static void pp2s_intr_bottom( 
	 * point, it is required to take GPS time, convert it to unix

	 * time, and to set it in the kernel, hence...

	 */

	if (done <= 0) {

	if (time_is_set <= 0) {

		struct timespec ts;

		gps_to_unix_time(&ts);

		done = !do_settimeofday(&ts);

		if (!done)

		time_is_set = !do_settimeofday(&ts);

		if (!time_is_set)

			LOG_DRVR_ERR("do_settimeofday() failed\n");

	}
@@ -706,6 +740,7 @@ static int wc_probe( 
	MAKE_RW_ATTR(pulsecnt_reg, &wc_sysfs, 3);

	MAKE_RW_ATTR(clockcnt_reg, &wc_sysfs, 4);

	MAKE_RW_ATTR(snapshot_reg, &wc_sysfs, 5);

	MAKE_RW_ATTR(reset_time,   &wc_sysfs, 6);



	/*

	 * Create sysfs group...