drivers/usb/phy/phy-isp1301.c

Source file repositories/reference/linux-study-clean/drivers/usb/phy/phy-isp1301.c

File Facts

System
Linux kernel
Corpus path
drivers/usb/phy/phy-isp1301.c
Extension
.c
Size
3901 bytes
Lines
164
Domain
Driver Families
Bucket
drivers/usb
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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 isp1301 {
	struct usb_phy		phy;
	struct mutex		mutex;

	struct i2c_client	*client;
};

#define phy_to_isp(p)		(container_of((p), struct isp1301, phy))

static const struct i2c_device_id isp1301_id[] = {
	{ "isp1301" },
	{ }
};
MODULE_DEVICE_TABLE(i2c, isp1301_id);

static const struct of_device_id isp1301_of_match[] = {
	{.compatible = "nxp,isp1301" },
	{ },
};
MODULE_DEVICE_TABLE(of, isp1301_of_match);

static struct i2c_client *isp1301_i2c_client;

static int __isp1301_write(struct isp1301 *isp, u8 reg, u8 value, u8 clear)
{
	return i2c_smbus_write_byte_data(isp->client, reg | clear, value);
}

static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value)
{
	return __isp1301_write(isp, reg, value, 0);
}

static int isp1301_clear(struct isp1301 *isp, u8 reg, u8 value)
{
	return __isp1301_write(isp, reg, value, ISP1301_I2C_REG_CLEAR_ADDR);
}

static int isp1301_phy_init(struct usb_phy *phy)
{
	struct isp1301 *isp = phy_to_isp(phy);

	/* Disable transparent UART mode first */
	isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_UART_EN);
	isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, ~MC1_SPEED_REG);
	isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
	isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_2, ~0);
	isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_2, (MC2_BI_DI | MC2_PSW_EN
				| MC2_SPD_SUSP_CTRL));

	isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, ~0);
	isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
	isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLDOWN
				| OTG1_DP_PULLDOWN));
	isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLUP
				| OTG1_DP_PULLUP));

	/* mask all interrupts */
	isp1301_clear(isp, ISP1301_I2C_INTERRUPT_LATCH, ~0);
	isp1301_clear(isp, ISP1301_I2C_INTERRUPT_FALLING, ~0);
	isp1301_clear(isp, ISP1301_I2C_INTERRUPT_RISING, ~0);

	return 0;
}

static int isp1301_phy_set_vbus(struct usb_phy *phy, int on)
{
	struct isp1301 *isp = phy_to_isp(phy);

	if (on)
		isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
	else
		isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);

	return 0;
}

static int isp1301_probe(struct i2c_client *client)
{
	struct isp1301 *isp;
	struct usb_phy *phy;

	isp = devm_kzalloc(&client->dev, sizeof(*isp), GFP_KERNEL);
	if (!isp)
		return -ENOMEM;

	isp->client = client;
	mutex_init(&isp->mutex);

	phy = &isp->phy;

Annotation

Implementation Notes