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80 lines
2.3 KiB
Diff
80 lines
2.3 KiB
Diff
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From 1910584831fe065c50efc3c07b8ea08ff90e6f31 Mon Sep 17 00:00:00 2001
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From: Stefan Wahren <stefan.wahren@i2se.com>
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Date: Sat, 13 Oct 2018 13:31:21 +0200
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Subject: [PATCH] firmware: raspberrypi: Add backward compatible
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get_throttled
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Avoid a hard userspace ABI change by adding a compatible get_throttled
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sysfs entry. Its value is now feed by the GET_THROTTLED requests of the
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new hwmon driver. The first access to get_throttled will generate
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a warning.
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Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
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---
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drivers/firmware/raspberrypi.c | 33 +++++++++++++++++++++++++++++++++
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1 file changed, 33 insertions(+)
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--- a/drivers/firmware/raspberrypi.c
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+++ b/drivers/firmware/raspberrypi.c
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@@ -28,6 +28,7 @@ struct rpi_firmware {
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struct mbox_chan *chan; /* The property channel. */
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struct completion c;
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u32 enabled;
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+ u32 get_throttled;
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};
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static struct platform_device *g_pdev;
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@@ -174,6 +175,12 @@ int rpi_firmware_property(struct rpi_fir
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kfree(data);
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+ if ((tag == RPI_FIRMWARE_GET_THROTTLED) &&
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+ memcmp(&fw->get_throttled, tag_data, sizeof(fw->get_throttled))) {
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+ memcpy(&fw->get_throttled, tag_data, sizeof(fw->get_throttled));
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+ sysfs_notify(&fw->cl.dev->kobj, NULL, "get_throttled");
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+ }
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+
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return ret;
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}
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EXPORT_SYMBOL_GPL(rpi_firmware_property);
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@@ -198,6 +205,27 @@ static int rpi_firmware_notify_reboot(st
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return 0;
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}
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+static ssize_t get_throttled_show(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct rpi_firmware *fw = dev_get_drvdata(dev);
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+
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+ WARN_ONCE(1, "deprecated, use hwmon sysfs instead\n");
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+
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+ return sprintf(buf, "%x\n", fw->get_throttled);
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+}
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+
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+static DEVICE_ATTR_RO(get_throttled);
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+
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+static struct attribute *rpi_firmware_dev_attrs[] = {
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+ &dev_attr_get_throttled.attr,
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+ NULL,
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+};
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+
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+static const struct attribute_group rpi_firmware_dev_group = {
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+ .attrs = rpi_firmware_dev_attrs,
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+};
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+
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static void
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rpi_firmware_print_firmware_revision(struct rpi_firmware *fw)
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{
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@@ -227,6 +255,11 @@ rpi_register_hwmon_driver(struct device
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rpi_hwmon = platform_device_register_data(dev, "raspberrypi-hwmon",
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-1, NULL, 0);
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+
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+ if (!IS_ERR_OR_NULL(rpi_hwmon)) {
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+ if (devm_device_add_group(dev, &rpi_firmware_dev_group))
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+ dev_err(dev, "Failed to create get_trottled attr\n");
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+ }
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}
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static void rpi_register_clk_driver(struct device *dev)
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