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authorAndrey Smirnov <andrew.smirnov@gmail.com>2018-03-08 22:20:45 +0300
committerLee Jones <lee.jones@linaro.org>2018-04-30 12:50:43 +0300
commit6552d3141064f09736580dc2dc527019762cbf71 (patch)
tree785365ae19ff2ce1d9d8dfeda516415849dbb20f /drivers/video
parent60cc43fc888428bb2f18f08997432d426a243338 (diff)
downloadlinux-6552d3141064f09736580dc2dc527019762cbf71.tar.xz
backlight: Add RAVE SP backlight driver
This driver provides access to RAVE SP backlight control functionality. Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> Acked-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/backlight/Kconfig6
-rw-r--r--drivers/video/backlight/Makefile1
-rw-r--r--drivers/video/backlight/rave-sp-backlight.c82
3 files changed, 89 insertions, 0 deletions
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 4e1d2ad50ba1..5d2d0d7e8100 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -467,6 +467,12 @@ config BACKLIGHT_ARCXCNN
If you have an ARCxCnnnn family backlight say Y to enable
the backlight driver.
+config BACKLIGHT_RAVE_SP
+ tristate "RAVE SP Backlight driver"
+ depends on RAVE_SP_CORE
+ help
+ Support for backlight control on RAVE SP device.
+
endif # BACKLIGHT_CLASS_DEVICE
endif # BACKLIGHT_LCD_SUPPORT
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 5e28f01c8391..19da71d518bf 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -57,3 +57,4 @@ obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o
obj-$(CONFIG_BACKLIGHT_TPS65217) += tps65217_bl.o
obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o
obj-$(CONFIG_BACKLIGHT_ARCXCNN) += arcxcnn_bl.o
+obj-$(CONFIG_BACKLIGHT_RAVE_SP) += rave-sp-backlight.o
diff --git a/drivers/video/backlight/rave-sp-backlight.c b/drivers/video/backlight/rave-sp-backlight.c
new file mode 100644
index 000000000000..462f14a1b19d
--- /dev/null
+++ b/drivers/video/backlight/rave-sp-backlight.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * LCD Backlight driver for RAVE SP
+ *
+ * Copyright (C) 2018 Zodiac Inflight Innovations
+ *
+ */
+
+#include <linux/backlight.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mfd/rave-sp.h>
+#include <linux/platform_device.h>
+
+#define RAVE_SP_BACKLIGHT_LCD_EN BIT(7)
+
+static int rave_sp_backlight_update_status(struct backlight_device *bd)
+{
+ const struct backlight_properties *p = &bd->props;
+ const u8 intensity =
+ (p->power == FB_BLANK_UNBLANK) ? p->brightness : 0;
+ struct rave_sp *sp = dev_get_drvdata(&bd->dev);
+ u8 cmd[] = {
+ [0] = RAVE_SP_CMD_SET_BACKLIGHT,
+ [1] = 0,
+ [2] = intensity ? RAVE_SP_BACKLIGHT_LCD_EN | intensity : 0,
+ [3] = 0,
+ [4] = 0,
+ };
+
+ return rave_sp_exec(sp, cmd, sizeof(cmd), NULL, 0);
+}
+
+static const struct backlight_ops rave_sp_backlight_ops = {
+ .options = BL_CORE_SUSPENDRESUME,
+ .update_status = rave_sp_backlight_update_status,
+};
+
+static struct backlight_properties rave_sp_backlight_props = {
+ .type = BACKLIGHT_PLATFORM,
+ .max_brightness = 100,
+ .brightness = 50,
+};
+
+static int rave_sp_backlight_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct backlight_device *bd;
+
+ bd = devm_backlight_device_register(dev, pdev->name, dev->parent,
+ dev_get_drvdata(dev->parent),
+ &rave_sp_backlight_ops,
+ &rave_sp_backlight_props);
+ if (IS_ERR(bd))
+ return PTR_ERR(bd);
+
+ backlight_update_status(bd);
+
+ return 0;
+}
+
+static const struct of_device_id rave_sp_backlight_of_match[] = {
+ { .compatible = "zii,rave-sp-backlight" },
+ {}
+};
+
+static struct platform_driver rave_sp_backlight_driver = {
+ .probe = rave_sp_backlight_probe,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = rave_sp_backlight_of_match,
+ },
+};
+module_platform_driver(rave_sp_backlight_driver);
+
+MODULE_DEVICE_TABLE(of, rave_sp_backlight_of_match);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>");
+MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>");
+MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
+MODULE_DESCRIPTION("RAVE SP Backlight driver");