Add a sysfs interface to allow userspace to modify the mapping between
ThinkPad hotkeys and the keycode input events they generate.
Signed-off-by: Henrique de Moraes Holschuh <hmh@xxxxxxxxxx>
---
drivers/misc/thinkpad_acpi.c | 109 +++++++++++++++++++++++++++++++++++++++--
1 files changed, 103 insertions(+), 6 deletions(-)
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index fad3bd0..5690247 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -809,6 +809,84 @@ static ssize_t hotkey_bios_mask_show(struct device *dev,
static struct device_attribute dev_attr_hotkey_bios_mask =
__ATTR(hotkey_bios_mask, S_IRUGO, hotkey_bios_mask_show, NULL);
+/* sysfs hotkey event_map ---------------------------------------------- */
+static ssize_t hotkey_event_map_read(struct kobject *kobj, char *buffer,
+ loff_t off, size_t count)
+{
+ int res;
+
+ BUG_ON(off < 0);
+
+ /* sanitize */
+ if (off > sizeof(hotkey_event_map))
+ return 0;
+ if (off + count > sizeof(hotkey_event_map))
+ count = sizeof(hotkey_event_map) - off;
+
+ if (count > 0) {
+ res = mutex_lock_interruptible(&hotkey_mutex);
+ if (res < 0)
+ return res;
+
+ /* Attribute is little-endian. Since this driver is for
+ * ia32 and amd-64 only, conversion is not required */
+ memcpy(buffer, (char *)hotkey_event_map + off, count);
+
+ mutex_unlock(&hotkey_mutex);
+ }
+
+ return count;
+}
+
+static ssize_t hotkey_event_map_write(struct kobject *kobj, char *buffer,
+ loff_t off, size_t count)
+{
+ unsigned int i;
+ u16 *p;
+ int res;
+
+ /*
+ * Due to weirdness in the sysfs bin attribute support,
+ * for fixed-size attributes, we accept only full writes
+ * of the entire buffer.
+ *
+ * Too bad we can't force a fixed size for the inode,
+ * that would allow proper support. On 2.6.20, a short
+ * write can truncate the file(!) and break subsequent
+ * reads of the binary attribute.
+ */
+ if (off != 0 || count != sizeof(hotkey_event_map))
+ return -EINVAL;
+
+ /* validate buffer */
+ for (i = 0, p = (u16 *)buffer; i < count; i += 2, p++)
+ if (*p > KEY_MAX)
+ return -EINVAL;
+
+ res = mutex_lock_interruptible(&hotkey_mutex);
+ if (res < 0)
+ return res;
+
+ /* Attribute is little-endian. Since this driver is for
+ * ia32 and amd-64 only, conversion is not required */
+ memcpy((char *)hotkey_event_map + off, buffer, count);
+
+ mutex_unlock(&hotkey_mutex);
+
+ return count;
+}
+
+static struct bin_attribute bin_attr_hotkey_event_map = {
+ .attr = {
+ .name = "hotkey_event_map",
+ .mode = S_IWUSR | S_IRUGO,
+ .owner = THIS_MODULE,
+ },
+ .size = sizeof(hotkey_event_map),
+ .read = hotkey_event_map_read,
+ .write = hotkey_event_map_write,
+};
+
/* --------------------------------------------------------------------- */
static struct attribute *hotkey_mask_attributes[] = {
@@ -862,6 +940,12 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
hotkey_dev_attributes,
&tpacpi_pdev->dev.kobj);
+ if (!res) {
+ res = sysfs_create_bin_file(
+ &tpacpi_pdev->dev.kobj,
+ &bin_attr_hotkey_event_map);
+ }
+
if (res)
return res;
@@ -885,6 +969,9 @@ static void hotkey_exit(void)
}
if (hotkey_dev_attributes) {
+ sysfs_remove_bin_file(&tpacpi_pdev->dev.kobj,
+ &bin_attr_hotkey_event_map);
+
delete_attr_set(hotkey_dev_attributes, &tpacpi_pdev->dev.kobj);
hotkey_dev_attributes = NULL;
}
@@ -900,18 +987,28 @@ static void tpacpi_input_send_key(unsigned int keycode)
}
}
+static void hotkey_send_input_event(int hkey)
+{
+ unsigned int keycode;
+
+ if (hkey > 0x1000 && hkey < 0x1011) {
+ mutex_lock(&hotkey_mutex);
+ keycode = hotkey_event_map[(hkey - 1) & 0x0f];
+ mutex_unlock(&hotkey_mutex);
+
+ tpacpi_input_send_key(keycode);
+ } else {
+ printk(IBM_ERR "unknown hotkey 0x%04x\n", hkey);
+ }
+}
+
static void hotkey_notify(struct ibm_struct *ibm, u32 event)
{
int hkey;
if (acpi_evalf(hkey_handle, &hkey, "MHKP", "d")) {
acpi_bus_generate_event(ibm->acpi->device, event, hkey);
- if (hkey > 0x1000 && hkey < 0x1011) {
- tpacpi_input_send_key(
- hotkey_event_map[(hkey - 1) & 0x0f]);
- } else {
- printk(IBM_ERR "unknown hotkey 0x%04x\n", hkey);
- }
+ hotkey_send_input_event(hkey);
} else {
printk(IBM_ERR "unknown hotkey event %d\n", event);
acpi_bus_generate_event(ibm->acpi->device, event, 0);
--
1.5.1.6
-
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