diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0081-rpi_display-add-backlight-driver-and-overlay.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0081-rpi_display-add-backlight-driver-and-overlay.patch | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0081-rpi_display-add-backlight-driver-and-overlay.patch b/target/linux/bcm27xx/patches-5.4/950-0081-rpi_display-add-backlight-driver-and-overlay.patch deleted file mode 100644 index f1dfb2c556..0000000000 --- a/target/linux/bcm27xx/patches-5.4/950-0081-rpi_display-add-backlight-driver-and-overlay.patch +++ /dev/null @@ -1,172 +0,0 @@ -From 9cad45e26ed0fc4cd640438c57a566f531f82ee5 Mon Sep 17 00:00:00 2001 -From: P33M <P33M@github.com> -Date: Wed, 21 Oct 2015 14:55:21 +0100 -Subject: [PATCH] rpi_display: add backlight driver and overlay - -Add a mailbox-driven backlight controller for the Raspberry Pi DSI -touchscreen display. Requires updated GPU firmware to recognise the -mailbox request. - -Signed-off-by: Gordon Hollingworth <gordon@raspberrypi.org> - -Add Raspberry Pi firmware driver to the dependencies of backlight driver - -Otherwise the backlight driver fails to build if the firmware -loading driver is not in the kernel - -Signed-off-by: Alex Riesen <alexander.riesen@cetitec.com> ---- - drivers/video/backlight/Kconfig | 7 ++ - drivers/video/backlight/Makefile | 1 + - drivers/video/backlight/rpi_backlight.c | 119 ++++++++++++++++++++++++ - 3 files changed, 127 insertions(+) - create mode 100644 drivers/video/backlight/rpi_backlight.c - ---- a/drivers/video/backlight/Kconfig -+++ b/drivers/video/backlight/Kconfig -@@ -248,6 +248,13 @@ config BACKLIGHT_PWM - If you have a LCD backlight adjustable by PWM, say Y to enable - this driver. - -+config BACKLIGHT_RPI -+ tristate "Raspberry Pi display firmware driven backlight" -+ depends on RASPBERRYPI_FIRMWARE -+ help -+ If you have the Raspberry Pi DSI touchscreen display, say Y to -+ enable the mailbox-controlled backlight driver. -+ - config BACKLIGHT_DA903X - tristate "Backlight Driver for DA9030/DA9034 using WLED" - depends on PMIC_DA903X ---- a/drivers/video/backlight/Makefile -+++ b/drivers/video/backlight/Makefile -@@ -50,6 +50,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA) += pand - obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o - obj-$(CONFIG_BACKLIGHT_PM8941_WLED) += pm8941-wled.o - obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o -+obj-$(CONFIG_BACKLIGHT_RPI) += rpi_backlight.o - obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o - obj-$(CONFIG_BACKLIGHT_SKY81452) += sky81452-backlight.o - obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o ---- /dev/null -+++ b/drivers/video/backlight/rpi_backlight.c -@@ -0,0 +1,119 @@ -+/* -+ * rpi_bl.c - Backlight controller through VPU -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 as -+ * published by the Free Software Foundation. -+ */ -+ -+#include <linux/backlight.h> -+#include <linux/err.h> -+#include <linux/fb.h> -+#include <linux/gpio.h> -+#include <linux/init.h> -+#include <linux/kernel.h> -+#include <linux/module.h> -+#include <linux/of.h> -+#include <linux/of_gpio.h> -+#include <linux/platform_device.h> -+#include <linux/slab.h> -+#include <soc/bcm2835/raspberrypi-firmware.h> -+ -+struct rpi_backlight { -+ struct device *dev; -+ struct device *fbdev; -+ struct rpi_firmware *fw; -+}; -+ -+static int rpi_backlight_update_status(struct backlight_device *bl) -+{ -+ struct rpi_backlight *gbl = bl_get_data(bl); -+ int brightness = bl->props.brightness; -+ int ret; -+ -+ if (bl->props.power != FB_BLANK_UNBLANK || -+ bl->props.fb_blank != FB_BLANK_UNBLANK || -+ bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) -+ brightness = 0; -+ -+ ret = rpi_firmware_property(gbl->fw, -+ RPI_FIRMWARE_FRAMEBUFFER_SET_BACKLIGHT, -+ &brightness, sizeof(brightness)); -+ if (ret) { -+ dev_err(gbl->dev, "Failed to set brightness\n"); -+ return ret; -+ } -+ -+ if (brightness < 0) { -+ dev_err(gbl->dev, "Backlight change failed\n"); -+ return -EAGAIN; -+ } -+ -+ return 0; -+} -+ -+static const struct backlight_ops rpi_backlight_ops = { -+ .options = BL_CORE_SUSPENDRESUME, -+ .update_status = rpi_backlight_update_status, -+}; -+ -+static int rpi_backlight_probe(struct platform_device *pdev) -+{ -+ struct backlight_properties props; -+ struct backlight_device *bl; -+ struct rpi_backlight *gbl; -+ struct device_node *fw_node; -+ -+ gbl = devm_kzalloc(&pdev->dev, sizeof(*gbl), GFP_KERNEL); -+ if (gbl == NULL) -+ return -ENOMEM; -+ -+ gbl->dev = &pdev->dev; -+ -+ fw_node = of_parse_phandle(pdev->dev.of_node, "firmware", 0); -+ if (!fw_node) { -+ dev_err(&pdev->dev, "Missing firmware node\n"); -+ return -ENOENT; -+ } -+ -+ gbl->fw = rpi_firmware_get(fw_node); -+ if (!gbl->fw) -+ return -EPROBE_DEFER; -+ -+ memset(&props, 0, sizeof(props)); -+ props.type = BACKLIGHT_RAW; -+ props.max_brightness = 255; -+ bl = devm_backlight_device_register(&pdev->dev, dev_name(&pdev->dev), -+ &pdev->dev, gbl, &rpi_backlight_ops, -+ &props); -+ if (IS_ERR(bl)) { -+ dev_err(&pdev->dev, "failed to register backlight\n"); -+ return PTR_ERR(bl); -+ } -+ -+ bl->props.brightness = 255; -+ backlight_update_status(bl); -+ -+ platform_set_drvdata(pdev, bl); -+ return 0; -+} -+ -+static const struct of_device_id rpi_backlight_of_match[] = { -+ { .compatible = "raspberrypi,rpi-backlight" }, -+ { /* sentinel */ } -+}; -+MODULE_DEVICE_TABLE(of, rpi_backlight_of_match); -+ -+static struct platform_driver rpi_backlight_driver = { -+ .driver = { -+ .name = "rpi-backlight", -+ .of_match_table = of_match_ptr(rpi_backlight_of_match), -+ }, -+ .probe = rpi_backlight_probe, -+}; -+ -+module_platform_driver(rpi_backlight_driver); -+ -+MODULE_AUTHOR("Gordon Hollingworth <gordon@raspberrypi.org>"); -+MODULE_DESCRIPTION("Raspberry Pi mailbox based Backlight Driver"); -+MODULE_LICENSE("GPL"); |