drivers/i2c/busses/i2c-octeon-platdrv.c

Source file repositories/reference/linux-study-clean/drivers/i2c/busses/i2c-octeon-platdrv.c

File Facts

System
Linux kernel
Corpus path
drivers/i2c/busses/i2c-octeon-platdrv.c
Extension
.c
Size
7137 bytes
Lines
284
Domain
Driver Families
Bucket
drivers/i2c
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

of_property_read_u32(node, "clock-rate", &i2c->twsi_freq)) {
		dev_err(i2c->dev,
			"no I2C 'clock-rate' or 'clock-frequency' property\n");
		result = -ENXIO;
		goto out;
	}

	i2c->sys_freq = octeon_get_io_clock_rate();

	init_waitqueue_head(&i2c->queue);

	i2c->irq = irq;

	if (cn78xx_style) {
		i2c->hlc_irq = hlc_irq;

		i2c->int_enable = octeon_i2c_int_enable78;
		i2c->int_disable = octeon_i2c_int_disable78;
		i2c->hlc_int_enable = octeon_i2c_hlc_int_enable78;
		i2c->hlc_int_disable = octeon_i2c_hlc_int_disable78;

		irq_set_status_flags(i2c->irq, IRQ_NOAUTOEN);
		irq_set_status_flags(i2c->hlc_irq, IRQ_NOAUTOEN);

		result = devm_request_irq(&pdev->dev, i2c->hlc_irq,
					  octeon_i2c_hlc_isr78, 0,
					  DRV_NAME, i2c);
		if (result < 0) {
			dev_err(i2c->dev, "failed to attach interrupt\n");
			goto out;
		}
	} else {
		i2c->int_enable = octeon_i2c_int_enable;
		i2c->int_disable = octeon_i2c_int_disable;
		i2c->hlc_int_enable = octeon_i2c_hlc_int_enable;
		i2c->hlc_int_disable = octeon_i2c_int_disable;
	}

	result = devm_request_irq(&pdev->dev, i2c->irq,
				  octeon_i2c_isr, 0, DRV_NAME, i2c);
	if (result < 0) {
		dev_err(i2c->dev, "failed to attach interrupt\n");
		goto out;
	}

	if (OCTEON_IS_MODEL(OCTEON_CN38XX))
		i2c->broken_irq_check = true;

	result = octeon_i2c_init_lowlevel(i2c);
	if (result) {
		dev_err(i2c->dev, "init low level failed\n");
		goto  out;
	}

	octeon_i2c_set_clock(i2c);

	i2c->adap = octeon_i2c_ops;
	i2c->adap.timeout = msecs_to_jiffies(2);
	i2c->adap.retries = 5;
	i2c->adap.bus_recovery_info = &octeon_i2c_recovery_info;
	i2c->adap.dev.parent = &pdev->dev;
	i2c->adap.dev.of_node = node;
	i2c_set_adapdata(&i2c->adap, i2c);
	platform_set_drvdata(pdev, i2c);

	result = i2c_add_adapter(&i2c->adap);
	if (result < 0)
		goto out;
	dev_info(i2c->dev, "probed\n");
	return 0;

out:
	return result;
};

static void octeon_i2c_remove(struct platform_device *pdev)
{
	struct octeon_i2c *i2c = platform_get_drvdata(pdev);

	i2c_del_adapter(&i2c->adap);
};

static const struct of_device_id octeon_i2c_match[] = {
	{ .compatible = "cavium,octeon-3860-twsi", },
	{ .compatible = "cavium,octeon-7890-twsi", },
	{},
};
MODULE_DEVICE_TABLE(of, octeon_i2c_match);

static struct platform_driver octeon_i2c_driver = {

Annotation

Implementation Notes