drivers/misc/smpro-misc.c

Source file repositories/reference/linux-study-clean/drivers/misc/smpro-misc.c

File Facts

System
Linux kernel
Corpus path
drivers/misc/smpro-misc.c
Extension
.c
Size
3255 bytes
Lines
146
Domain
Driver Families
Bucket
drivers/misc
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 smpro_misc {
	struct regmap *regmap;
};

static ssize_t boot_progress_show(struct device *dev, struct device_attribute *da, char *buf)
{
	struct smpro_misc *misc = dev_get_drvdata(dev);
	u16 boot_progress[3] = { 0 };
	u32 bootstage;
	u8 boot_stage;
	u8 cur_stage;
	u32 reg_lo;
	u32 reg;
	int ret;

	/* Read current boot stage */
	ret = regmap_read(misc->regmap, CUR_BOOTSTAGE, &reg);
	if (ret)
		return ret;

	cur_stage = reg & 0xff;

	ret = regmap_read(misc->regmap, BOOTSTAGE, &bootstage);
	if (ret)
		return ret;

	boot_stage = (bootstage >> 8) & 0xff;

	if (boot_stage > cur_stage)
		return -EINVAL;

	ret = regmap_read(misc->regmap,	BOOTSTAGE_LO, &reg_lo);
	if (!ret)
		ret = regmap_read(misc->regmap, BOOTSTAGE_HI, &reg);
	if (ret)
		return ret;

	/* Firmware to report new boot stage next time */
	if (boot_stage < cur_stage) {
		ret = regmap_write(misc->regmap, BOOTSTAGE, ((bootstage & 0xff00) | 0x1));
		if (ret)
			return ret;
	}

	boot_progress[0] = bootstage;
	boot_progress[1] = swab16(reg);
	boot_progress[2] = swab16(reg_lo);

	return sysfs_emit(buf, "%*phN\n", (int)sizeof(boot_progress), boot_progress);
}

static DEVICE_ATTR_RO(boot_progress);

static ssize_t soc_power_limit_show(struct device *dev, struct device_attribute *da, char *buf)
{
	struct smpro_misc *misc = dev_get_drvdata(dev);
	unsigned int value;
	int ret;

	ret = regmap_read(misc->regmap, SOC_POWER_LIMIT, &value);
	if (ret)
		return ret;

	return sysfs_emit(buf, "%d\n", value);
}

static ssize_t soc_power_limit_store(struct device *dev, struct device_attribute *da,
				     const char *buf, size_t count)
{
	struct smpro_misc *misc = dev_get_drvdata(dev);
	unsigned long val;
	s32 ret;

	ret = kstrtoul(buf, 0, &val);
	if (ret)
		return ret;

	ret = regmap_write(misc->regmap, SOC_POWER_LIMIT, (unsigned int)val);
	if (ret)
		return -EPROTO;

	return count;
}

static DEVICE_ATTR_RW(soc_power_limit);

static struct attribute *smpro_misc_attrs[] = {
	&dev_attr_boot_progress.attr,
	&dev_attr_soc_power_limit.attr,
	NULL

Annotation

Implementation Notes