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Commit 95d18be6 authored by David Collins's avatar David Collins
Browse files

regulator: core: add support to log enabled regulators during suspend 



Add support to print a list of enabled regulators in the
kernel log.  This is useful when debugging low power modes
during suspend.

Change-Id: I78acb1285caeaeccd30efc16bb5bc001f66bdf33
Signed-off-by: default avatarDavid Collins <collinsd@codeaurora.org>
parent 6e9f8d30

drivers/regulator/core.c

+69 −0
Original line number Original line Diff line number Diff line
@@ -57,6 +57,7 @@ static LIST_HEAD(regulator_map_list); 
static LIST_HEAD(regulator_ena_gpio_list);

static LIST_HEAD(regulator_ena_gpio_list);

static LIST_HEAD(regulator_supply_alias_list);

static LIST_HEAD(regulator_supply_alias_list);

static bool has_full_constraints;

static bool has_full_constraints;

static bool debug_suspend;





static struct dentry *debugfs_root;

static struct dentry *debugfs_root;
@@ -5120,6 +5121,71 @@ static const struct file_operations regulator_summary_fops = { 
#endif

#endif

};

};





static int _regulator_debug_print_enabled(struct device *dev, void *data)

{

	struct regulator_dev *rdev = dev_to_rdev(dev);

	struct regulator *reg;

	const char *supply_name;

	int mode = -EPERM;

	int uV = -EPERM;



	if (_regulator_is_enabled(rdev) <= 0)

		return 0;



	uV = _regulator_get_voltage(rdev);



	if (rdev->desc->ops->get_mode)

		mode = rdev->desc->ops->get_mode(rdev);



	if (uV != -EPERM && mode != -EPERM)

		pr_info("%s[%u] %d uV, mode=%d\n",

			rdev_get_name(rdev), rdev->use_count, uV, mode);

	else if (uV != -EPERM)

		pr_info("%s[%u] %d uV\n",

			rdev_get_name(rdev), rdev->use_count, uV);

	else if (mode != -EPERM)

		pr_info("%s[%u], mode=%d\n",

			rdev_get_name(rdev), rdev->use_count, mode);

	else

		pr_info("%s[%u]\n", rdev_get_name(rdev), rdev->use_count);



	/* Print a header if there are consumers. */

	if (rdev->open_count)

		pr_info("  %-32s EN    Min_uV   Max_uV  load_uA\n",

			"Device-Supply");



	list_for_each_entry(reg, &rdev->consumer_list, list) {

		if (reg->supply_name)

			supply_name = reg->supply_name;

		else

			supply_name = "(null)-(null)";



		pr_info("  %-32s %d   %8d %8d %8d\n", supply_name, reg->enabled,

			reg->voltage[PM_SUSPEND_ON].min_uV,

			reg->voltage[PM_SUSPEND_ON].max_uV,

			reg->uA_load);

	}



	return 0;

}



/**

 * regulator_debug_print_enabled - log enabled regulators

 *

 * Print the names of all enabled regulators and their consumers to the kernel

 * log if debug_suspend is set from debugfs.

 */

void regulator_debug_print_enabled(void)

{

	if (likely(!debug_suspend))

		return;



	pr_info("Enabled regulators:\n");

	class_for_each_device(&regulator_class, NULL, NULL,

			     _regulator_debug_print_enabled);

}

EXPORT_SYMBOL(regulator_debug_print_enabled);



static int __init regulator_init(void)

static int __init regulator_init(void)

{

{

	int ret;

	int ret;
@@ -5136,6 +5202,9 @@ static int __init regulator_init(void) 
	debugfs_create_file("regulator_summary", 0444, debugfs_root,

	debugfs_create_file("regulator_summary", 0444, debugfs_root,

			    NULL, &regulator_summary_fops);

			    NULL, &regulator_summary_fops);





	debugfs_create_bool("debug_suspend", 0644, debugfs_root,

			    &debug_suspend);



	regulator_dummy_init();

	regulator_dummy_init();





	return ret;

	return ret;

include/linux/regulator/machine.h

+4 −0
Original line number Original line Diff line number Diff line
@@ -247,10 +247,14 @@ struct regulator_init_data { 




#ifdef CONFIG_REGULATOR

#ifdef CONFIG_REGULATOR

void regulator_has_full_constraints(void);

void regulator_has_full_constraints(void);

void regulator_debug_print_enabled(void);

#else

#else

static inline void regulator_has_full_constraints(void)

static inline void regulator_has_full_constraints(void)

{

{

}

}

static void regulator_debug_print_enabled(void)

{

}

#endif

#endif





static inline int regulator_suspend_prepare(suspend_state_t state)

static inline int regulator_suspend_prepare(suspend_state_t state)