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firmware: raspberrypi: Add backward compatible get_throttled

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Avoid a hard userspace ABI change by adding a compatible get_throttled
sysfs entry. Its value is now feed by the GET_THROTTLED requests of the
new hwmon driver. The first access to get_throttled will generate
a warning.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
This commit is contained in:
Stefan Wahren
2018-10-13 13:31:21 +02:00
committed by Dom Cobley
parent d922bcbd9d
commit 96647fb6ea
1 changed files with 33 additions and 0 deletions
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33
drivers/firmware/raspberrypi.c
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@@ -31,6 +31,7 @@ struct rpi_firmware {
u32 enabled;
struct kref consumers;
u32 get_throttled;
};
static struct platform_device *g_pdev;
@@ -176,6 +177,12 @@ int rpi_firmware_property(struct rpi_firmware *fw,
kfree(data);
if ((tag == RPI_FIRMWARE_GET_THROTTLED) &&
memcmp(&fw->get_throttled, tag_data, sizeof(fw->get_throttled))) {
memcpy(&fw->get_throttled, tag_data, sizeof(fw->get_throttled));
sysfs_notify(&fw->cl.dev->kobj, NULL, "get_throttled");
}
return ret;
}
EXPORT_SYMBOL_GPL(rpi_firmware_property);
@@ -200,6 +207,27 @@ static int rpi_firmware_notify_reboot(struct notifier_block *nb,
return 0;
}
static ssize_t get_throttled_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct rpi_firmware *fw = dev_get_drvdata(dev);
WARN_ONCE(1, "deprecated, use hwmon sysfs instead\n");
return sprintf(buf, "%x\n", fw->get_throttled);
}
static DEVICE_ATTR_RO(get_throttled);
static struct attribute *rpi_firmware_dev_attrs[] = {
&dev_attr_get_throttled.attr,
NULL,
};
static const struct attribute_group rpi_firmware_dev_group = {
.attrs = rpi_firmware_dev_attrs,
};
static void
rpi_firmware_print_firmware_revision(struct rpi_firmware *fw)
{
@@ -229,6 +257,11 @@ rpi_register_hwmon_driver(struct device *dev, struct rpi_firmware *fw)
rpi_hwmon = platform_device_register_data(dev, "raspberrypi-hwmon",
-1, NULL, 0);
if (!IS_ERR_OR_NULL(rpi_hwmon)) {
if (devm_device_add_group(dev, &rpi_firmware_dev_group))
dev_err(dev, "Failed to create get_trottled attr\n");
}
}
static void rpi_register_clk_driver(struct device *dev)