u-boot/drivers/i2c/sandbox_i2c.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

117 lines
2.3 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Simulate an I2C port
*
* Copyright (c) 2014 Google, Inc
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <i2c.h>
#include <asm/test.h>
#include <dm/lists.h>
#include <dm/device-internal.h>
struct sandbox_i2c_priv {
bool test_mode;
};
static int get_emul(struct udevice *dev, struct udevice **devp,
struct dm_i2c_ops **opsp)
{
struct dm_i2c_chip *plat;
struct udevice *child;
int ret;
*devp = NULL;
*opsp = NULL;
plat = dev_get_parent_platdata(dev);
if (!plat->emul) {
ret = dm_scan_fdt_dev(dev);
if (ret)
return ret;
for (device_find_first_child(dev, &child); child;
device_find_next_child(&child)) {
if (device_get_uclass_id(child) != UCLASS_I2C_EMUL)
continue;
ret = device_probe(child);
if (ret)
return ret;
break;
}
if (child)
plat->emul = child;
else
return -ENODEV;
}
*devp = plat->emul;
*opsp = i2c_get_ops(plat->emul);
return 0;
}
void sandbox_i2c_set_test_mode(struct udevice *bus, bool test_mode)
{
struct sandbox_i2c_priv *priv = dev_get_priv(bus);
priv->test_mode = test_mode;
}
static int sandbox_i2c_xfer(struct udevice *bus, struct i2c_msg *msg,
int nmsgs)
{
struct dm_i2c_bus *i2c = dev_get_uclass_priv(bus);
struct sandbox_i2c_priv *priv = dev_get_priv(bus);
struct dm_i2c_ops *ops;
struct udevice *emul, *dev;
bool is_read;
int ret;
/* Special test code to return success but with no emulation */
if (priv->test_mode && msg->addr == SANDBOX_I2C_TEST_ADDR)
return 0;
ret = i2c_get_chip(bus, msg->addr, 1, &dev);
if (ret)
return ret;
ret = get_emul(dev, &emul, &ops);
if (ret)
return ret;
if (priv->test_mode) {
/*
* For testing, don't allow writing above 100KHz for writes and
* 400KHz for reads.
*/
is_read = nmsgs > 1;
if (i2c->speed_hz > (is_read ? 400000 : 100000)) {
debug("%s: Max speed exceeded\n", __func__);
return -EINVAL;
}
}
return ops->xfer(emul, msg, nmsgs);
}
static const struct dm_i2c_ops sandbox_i2c_ops = {
.xfer = sandbox_i2c_xfer,
};
static const struct udevice_id sandbox_i2c_ids[] = {
{ .compatible = "sandbox,i2c" },
{ }
};
U_BOOT_DRIVER(i2c_sandbox) = {
.name = "i2c_sandbox",
.id = UCLASS_I2C,
.of_match = sandbox_i2c_ids,
.ops = &sandbox_i2c_ops,
.priv_auto_alloc_size = sizeof(struct sandbox_i2c_priv),
};