119 lines
4.9 KiB
Diff
119 lines
4.9 KiB
Diff
diff --git a/ddcci-backlight/ddcci-backlight.c b/ddcci-backlight/ddcci-backlight.c
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index 7a98522..e518bfc 100644
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--- a/ddcci-backlight/ddcci-backlight.c
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+++ b/ddcci-backlight/ddcci-backlight.c
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@@ -29,6 +29,12 @@
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#define DDCCI_MONITOR_BACKLIGHT 0x13
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#define DDCCI_MONITOR_BL_WHITE 0x6B
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+#define DDCCI_BL_MUX_MAX_DEVICES 8
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+
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+static struct backlight_device *ddcci_bl_global_control = NULL;
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+static struct backlight_device *ddcci_bl_mux_devices[DDCCI_BL_MUX_MAX_DEVICES] = {NULL};
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+static int ddcci_bl_mux_device_count = 0;
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+
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static bool convenience_symlink = true;
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struct ddcci_monitor_drv_data {
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@@ -101,13 +107,21 @@ static int ddcci_backlight_update_status(struct backlight_device *bl)
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struct ddcci_monitor_drv_data *drv_data = bl_get_data(bl);
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int brightness = bl->props.brightness;
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int ret;
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+ int i;
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- if (bl->props.power != FB_BLANK_UNBLANK ||
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- bl->props.state & BL_CORE_FBBLANK)
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- brightness = 0;
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+ if (drv_data == NULL) {
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+ for (i = 0; i < ddcci_bl_mux_device_count; ++i) {
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+ ddcci_bl_mux_devices[i]->props.brightness = bl->props.brightness;
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+ ddcci_backlight_update_status(ddcci_bl_mux_devices[i]);
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+ }
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+ } else {
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+ if (bl->props.power != FB_BLANK_UNBLANK ||
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+ bl->props.state & BL_CORE_FBBLANK)
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+ brightness = 0;
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- ret = ddcci_monitor_writectrl(drv_data->device, drv_data->used_vcp,
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- brightness);
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+ ret = ddcci_monitor_writectrl(drv_data->device, drv_data->used_vcp,
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+ brightness);
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+ }
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if (ret > 0)
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ret = 0;
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return ret;
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@@ -119,6 +133,10 @@ static int ddcci_backlight_get_brightness(struct backlight_device *bl)
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int ret;
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struct ddcci_monitor_drv_data *drv_data = bl_get_data(bl);
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+ if (drv_data == NULL) {
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+ return bl->props.brightness;
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+ }
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+
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ret = ddcci_monitor_readctrl(drv_data->device, drv_data->used_vcp,
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&value, &maxval);
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if (ret < 0)
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@@ -277,6 +295,7 @@ static int ddcci_monitor_probe(struct ddcci_device *dev,
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{
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struct ddcci_monitor_drv_data *drv_data;
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struct backlight_properties props;
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+ struct backlight_properties cprops;
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struct backlight_device *bl = NULL;
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int ret = 0;
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bool support_luminance, support_bl_white;
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@@ -369,6 +388,27 @@ static int ddcci_monitor_probe(struct ddcci_device *dev,
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ddcci_backlight_create_symlink(dev);
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}
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+ if (ddcci_bl_global_control == NULL) {
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+ printk(KERN_INFO "ddcci-backlight: registering global controller with brightness=%d, max_brightness=%d\n",
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+ brightness, max_brightness);
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+ cprops.type = BACKLIGHT_RAW;
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+ cprops.max_brightness = max_brightness;
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+ cprops.brightness = brightness;
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+ ddcci_bl_global_control = devm_backlight_device_register(&dev->dev, "0000-ddcci_backlight_global_control",
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+ &dev->dev, NULL,
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+ &ddcci_backlight_ops, &cprops);
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+ };
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+
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+ if(ddcci_bl_mux_device_count < DDCCI_BL_MUX_MAX_DEVICES) {
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+ dev_info(&dev->dev, "registering backlight device %s as mux slave #%d",
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+ dev_name(&dev->dev), ddcci_bl_mux_device_count);
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+ ddcci_bl_mux_devices[ddcci_bl_mux_device_count] = bl;
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+ dev_info(&dev->dev, "registered mux slave #%d successfully", ddcci_bl_mux_device_count);
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+ ++ddcci_bl_mux_device_count;
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+ } else {
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+ dev_info(&dev->dev, "new backlight device added, but mux slave array is at max capacity. global control will not work for this device.");
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+ }
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+
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goto end;
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err_free:
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devm_kfree(&dev->dev, drv_data);
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@@ -378,8 +418,27 @@ end:
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static int ddcci_monitor_remove(struct ddcci_device *dev)
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{
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+ int i,j;
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+
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dev_dbg(&dev->dev, "removing device\n");
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ddcci_backlight_remove_symlink(dev);
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+
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+ for (i = 0; i < ddcci_bl_mux_device_count; ++i) {
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+ struct backlight_device *bl = ddcci_bl_mux_devices[i];
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+ printk(KERN_INFO "ddcci-backlight: scan for remove global device %d from control array\n", i);
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+ if (dev == (struct ddcci_device*) bl_get_data(bl)) {
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+ printk(KERN_INFO "ddcci-backlight: removing global device %d from control array\n", i);
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+ ddcci_bl_mux_devices[i] = NULL;
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+ for (j = i+1; j < ddcci_bl_mux_device_count; ++j) {
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+ if(ddcci_bl_mux_devices[j] != NULL) {
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+ printk(KERN_INFO "ddcci-backlight: adjusting global devices %d -> %d\n", j, j-1);
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+ ddcci_bl_mux_devices[j-1] = ddcci_bl_mux_devices[j];
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+ }
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+ }
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+ --ddcci_bl_mux_device_count;
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+ }
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+ }
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+
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return 0;
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}
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