drivers/platform/olpc/olpc-ec.c

Source file repositories/reference/linux-study-clean/drivers/platform/olpc/olpc-ec.c

File Facts

System
Linux kernel
Corpus path
drivers/platform/olpc/olpc-ec.c
Extension
.c
Size
11264 bytes
Lines
493
Domain
Driver Families
Bucket
drivers/platform
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern 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

static const struct file_operations ec_dbgfs_ops = {
	.write = ec_dbgfs_cmd_write,
	.read = ec_dbgfs_cmd_read,
};

static struct dentry *olpc_ec_setup_debugfs(void)
{
	struct dentry *dbgfs_dir;

	dbgfs_dir = debugfs_create_dir("olpc-ec", NULL);
	debugfs_create_file("cmd", 0600, dbgfs_dir, NULL, &ec_dbgfs_ops);

	return dbgfs_dir;
}

#else

static struct dentry *olpc_ec_setup_debugfs(void)
{
	return NULL;
}

#endif /* CONFIG_DEBUG_FS */

static int olpc_ec_set_dcon_power(struct olpc_ec_priv *ec, bool state)
{
	unsigned char ec_byte = state;
	int ret;

	if (ec->dcon_enabled == state)
		return 0;

	ret = olpc_ec_cmd(EC_DCON_POWER_MODE, &ec_byte, 1, NULL, 0);
	if (ret)
		return ret;

	ec->dcon_enabled = state;
	return 0;
}

static int dcon_regulator_enable(struct regulator_dev *rdev)
{
	struct olpc_ec_priv *ec = rdev_get_drvdata(rdev);

	return olpc_ec_set_dcon_power(ec, true);
}

static int dcon_regulator_disable(struct regulator_dev *rdev)
{
	struct olpc_ec_priv *ec = rdev_get_drvdata(rdev);

	return olpc_ec_set_dcon_power(ec, false);
}

static int dcon_regulator_is_enabled(struct regulator_dev *rdev)
{
	struct olpc_ec_priv *ec = rdev_get_drvdata(rdev);

	return ec->dcon_enabled ? 1 : 0;
}

static const struct regulator_ops dcon_regulator_ops = {
	.enable		= dcon_regulator_enable,
	.disable	= dcon_regulator_disable,
	.is_enabled	= dcon_regulator_is_enabled,
};

static const struct regulator_desc dcon_desc = {
	.name		= "dcon",
	.id		= 0,
	.ops		= &dcon_regulator_ops,
	.type		= REGULATOR_VOLTAGE,
	.owner		= THIS_MODULE,
	.enable_time	= 25000,
};

static int olpc_ec_probe(struct platform_device *pdev)
{
	struct olpc_ec_priv *ec;
	struct regulator_config config = { };
	struct regulator_dev *regulator;
	int err;

	if (!ec_driver)
		return -ENODEV;

	ec = kzalloc_obj(*ec);
	if (!ec)
		return -ENOMEM;

Annotation

Implementation Notes