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Commit e7e6fc7f authored by Valeri Atamaniouk's avatar Valeri Atamaniouk
Browse files

msm: qca1530: Sysfs chip reset control 



This change adds reset control capability using sysfs interface.

Change-Id: I766a6babae3ee12758ad94428e807b415cbd8ab1
Signed-off-by: default avatarValeri Atamaniouk <valeria@codeaurora.org>
parent 2d37de8c

drivers/platform/msm/qca1530.c

+75 −14
Original line number Diff line number Diff line
@@ -600,7 +600,7 @@ static void qca1530_reset_deinit(struct platform_device *pdev) 
{

	pr_debug("Releasing reset control");

	qca1530_deinit_gpio(pdev, &qca1530_data.reset_gpio,

		GPIO_OUTDIR_FLG | GPIO_EXPORT_FLG);

		GPIO_OUTDIR_FLG);

	if (qca1530_data.reset_reg) {

		qca1530_pwr_set_regulator(qca1530_data.reset_reg, 0);

		qca1530_deinit_regulator(&qca1530_data.reset_reg);
@@ -623,7 +623,7 @@ static int qca1530_reset_init(struct platform_device *pdev) 
	pr_debug("Initializing reset control");



	ret = qca1530_init_gpio(pdev, &qca1530_data.reset_gpio,

		QCA1530_OF_RESET_GPIO_NAME, GPIO_OUTDIR_FLG | GPIO_EXPORT_FLG);

		QCA1530_OF_RESET_GPIO_NAME, GPIO_OUTDIR_FLG);



	if (ret < 0) {

		goto err_0;
@@ -915,22 +915,27 @@ switching_off: 
	return ret;

}





static ssize_t chip_state_show(struct kobject *kobj,

/**

 * qca1530_attr_chip_state_show() - provides current chip state through sysfs

 */

static ssize_t qca1530_attr_chip_state_show(struct kobject *kobj,

	struct kobj_attribute *attr,

	char *buf)

{

	return snprintf(buf, 16, "%d\n", qca1530_data.chip_state);

}



static ssize_t chip_state_store(struct kobject *kobj,

/**

 * qca1530_attr_chip_state_store() - sets new chip state

 */

static ssize_t qca1530_attr_chip_state_store(struct kobject *kobj,

	struct kobj_attribute *attr,

	const char *buf, size_t count)

{

	int retval;

	int new_state;



	sscanf(buf, "%du", &new_state);

	sscanf(buf, "%d", &new_state);

	pr_debug("new_state=%d", new_state);

	if (count &&

		((new_state <= QCA1530_ALL_FLG) && (new_state >= 0))) {
@@ -943,20 +948,73 @@ static ssize_t chip_state_store(struct kobject *kobj, 
	return count;

}



static struct kobj_attribute chip_state_attribute =

	__ATTR(chip_state, 0600, chip_state_show, chip_state_store);

/**

 * qca1530_attr_reset_show() - provides current reset state through sysfs

 */

static ssize_t qca1530_attr_reset_show(struct kobject *kobj,

	struct kobj_attribute *attr,

	char *buf)

{

	int v = -1;



	if (qca1530_data.chip_state & QCA1530_RESET_FLG)

		v = gpio_get_value(qca1530_data.reset_gpio);



	return snprintf(buf, 16, "%d\n", v);

}



/**

 * qca1530_attr_reset_store() - sets new reset state

 */

static ssize_t qca1530_attr_reset_store(struct kobject *kobj,

	struct kobj_attribute *attr,

	const char *buf, size_t count)

{

	int v;



	if (sscanf(buf, "%d", &v) == 1

		&& (qca1530_data.chip_state & QCA1530_RESET_FLG))

		gpio_set_value(qca1530_data.reset_gpio, v ? 1 : 0);



	return count;

}



/*

 * qca1530_attributes - sysfs attribute definition array

 */

static struct kobj_attribute qca1530_attributes[] = {

	__ATTR(chip_state,

		S_IRUSR | S_IWUSR,

		qca1530_attr_chip_state_show, qca1530_attr_chip_state_store),

	__ATTR(reset,

		S_IRUSR | S_IWUSR,

		qca1530_attr_reset_show, qca1530_attr_reset_store),

};



static struct attribute *attrs[] = {

	&chip_state_attribute.attr,

/*

 * qca1530_attrs - sysfs attributes for attribute group

 */

static struct attribute *qca1530_attrs[] = {

	&qca1530_attributes[0].attr,

	&qca1530_attributes[1].attr,

	NULL,

};



static struct attribute_group attr_group = {

	.attrs = attrs,

/*

 * qca1530_attr_group - driver sysfs attribute group

 */

static struct attribute_group qca1530_attr_group = {

	.attrs = qca1530_attrs,

};



static struct kobject *qca1530_kobject;



/**

 * qca1530_create_sysfs_node() - creates sysfs nodes for control

 *

 * Function exports two control nodes: for controlling chip control signals

 * and for reset control.

 */

static int qca1530_create_sysfs_node(void)

{

	int retval;
@@ -968,7 +1026,7 @@ static int qca1530_create_sysfs_node(void) 
	if (!qca1530_kobject)

		return -ENOMEM;



	retval = sysfs_create_group(qca1530_kobject, &attr_group);

	retval = sysfs_create_group(qca1530_kobject, &qca1530_attr_group);

	pr_debug("sysfs_create_group() returned %d", retval);

	if (retval)

		kobject_put(qca1530_kobject);
@@ -976,11 +1034,14 @@ static int qca1530_create_sysfs_node(void) 
	return retval;

}



/**

 * qca1530_remove_sysfs_node() - removes sysfs nodes

 */

static void qca1530_remove_sysfs_node(void)

{

	pr_debug("Removing sysfs node");

	if (qca1530_kobject) {

		sysfs_remove_group(qca1530_kobject, &attr_group);

		sysfs_remove_group(qca1530_kobject, &qca1530_attr_group);

		kobject_put(qca1530_kobject);

		qca1530_kobject = NULL;

	}