drivers/platform/x86/intel/bytcrc_pwrsrc.c

Source file repositories/reference/linux-study-clean/drivers/platform/x86/intel/bytcrc_pwrsrc.c

File Facts

System
Linux kernel
Corpus path
drivers/platform/x86/intel/bytcrc_pwrsrc.c
Extension
.c
Size
6992 bytes
Lines
256
Domain
Driver Families
Bucket
drivers/platform
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct crc_pwrsrc_data {
	struct regmap *regmap;
	struct dentry *debug_dentry;
	struct power_supply *psy;
	unsigned int resetsrc0;
	unsigned int resetsrc1;
	unsigned int wakesrc;
};

static const char * const pwrsrc_pwrsrc_info[] = {
	/* bit 0 */ "USB",
	/* bit 1 */ "DC in",
	/* bit 2 */ "Battery",
	NULL,
};

static const char * const pwrsrc_resetsrc0_info[] = {
	/* bit 0 */ "SOC reporting a thermal event",
	/* bit 1 */ "critical PMIC temperature",
	/* bit 2 */ "critical system temperature",
	/* bit 3 */ "critical battery temperature",
	/* bit 4 */ "VSYS under voltage",
	/* bit 5 */ "VSYS over voltage",
	/* bit 6 */ "battery removal",
	NULL,
};

static const char * const pwrsrc_resetsrc1_info[] = {
	/* bit 0 */ "VCRIT threshold",
	/* bit 1 */ "BATID reporting battery removal",
	/* bit 2 */ "user pressing the power button",
	NULL,
};

static const char * const pwrsrc_wakesrc_info[] = {
	/* bit 0 */ "user pressing the power button",
	/* bit 1 */ "a battery insertion",
	/* bit 2 */ "a USB charger insertion",
	/* bit 3 */ "an adapter insertion",
	NULL,
};

static void crc_pwrsrc_log(struct seq_file *seq, const char *prefix,
			   const char * const *info, unsigned int reg_val)
{
	int i;

	for (i = 0; info[i]; i++) {
		if (reg_val & BIT(i))
			seq_printf(seq, "%s by %s\n", prefix, info[i]);
	}
}

static int pwrsrc_show(struct seq_file *seq, void *unused)
{
	struct crc_pwrsrc_data *data = seq->private;
	unsigned int reg_val;
	int ret;

	ret = regmap_read(data->regmap, CRYSTALCOVE_SPWRSRC_REG, &reg_val);
	if (ret)
		return ret;

	crc_pwrsrc_log(seq, "System powered", pwrsrc_pwrsrc_info, reg_val);
	return 0;
}

static int resetsrc_show(struct seq_file *seq, void *unused)
{
	struct crc_pwrsrc_data *data = seq->private;

	crc_pwrsrc_log(seq, "Last shutdown caused", pwrsrc_resetsrc0_info, data->resetsrc0);
	crc_pwrsrc_log(seq, "Last shutdown caused", pwrsrc_resetsrc1_info, data->resetsrc1);
	return 0;
}

static int wakesrc_show(struct seq_file *seq, void *unused)
{
	struct crc_pwrsrc_data *data = seq->private;

	crc_pwrsrc_log(seq, "Last wake caused", pwrsrc_wakesrc_info, data->wakesrc);
	return 0;
}

DEFINE_SHOW_ATTRIBUTE(pwrsrc);
DEFINE_SHOW_ATTRIBUTE(resetsrc);
DEFINE_SHOW_ATTRIBUTE(wakesrc);

static int crc_pwrsrc_read_and_clear(struct crc_pwrsrc_data *data,
				     unsigned int reg, unsigned int *val)

Annotation

Implementation Notes