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Subject[PATCH v3] fb: backlight: add driver for iPAQ micro backlight
Date
This adds a driver for the backlight controlled by the microcontroller
on the Compaq iPAQ series of handheld computers: h3100, h3600
and h3700.

Acked-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v2->v3:
- Order includes alphabetically
- Use explicit GPL v2 license
ChangeLog v1->v2:
- Add a comment to clarify message format
- Coding format and style fixes
- Drop driver announce boilerplate
- Drop empty remove() function
---
drivers/video/backlight/Kconfig | 9 ++++
drivers/video/backlight/Makefile | 1 +
drivers/video/backlight/ipaq_micro_bl.c | 83 +++++++++++++++++++++++++++++++++
3 files changed, 93 insertions(+)
create mode 100644 drivers/video/backlight/ipaq_micro_bl.c

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 5d449059a556..cc153f55d9f9 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -207,6 +207,15 @@ config BACKLIGHT_GENERIC
known as the Corgi backlight driver. If you have a Sharp Zaurus
SL-C7xx, SL-Cxx00 or SL-6000x say y.

+config BACKLIGHT_IPAQ_MICRO
+ tristate "iPAQ microcontroller backlight driver"
+ depends on MFD_IPAQ_MICRO
+ default y
+ help
+ Say y to enable the backlight driver for Compaq iPAQ handheld
+ computers. Say yes if you have one of the h3100/h3600/h3700
+ machines.
+
config BACKLIGHT_LM3533
tristate "Backlight Driver for LM3533"
depends on BACKLIGHT_CLASS_DEVICE
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index bb820024f346..a9ea34a39cad 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_BACKLIGHT_GENERIC) += generic_bl.o
obj-$(CONFIG_BACKLIGHT_GPIO) += gpio_backlight.o
obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o
obj-$(CONFIG_BACKLIGHT_HP700) += jornada720_bl.o
+obj-$(CONFIG_BACKLIGHT_IPAQ_MICRO) += ipaq_micro_bl.o
obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o
obj-$(CONFIG_BACKLIGHT_LM3630A) += lm3630a_bl.o
obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o
diff --git a/drivers/video/backlight/ipaq_micro_bl.c b/drivers/video/backlight/ipaq_micro_bl.c
new file mode 100644
index 000000000000..feab29c6b255
--- /dev/null
+++ b/drivers/video/backlight/ipaq_micro_bl.c
@@ -0,0 +1,83 @@
+/*
+ * 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.
+ *
+ * iPAQ microcontroller backlight support
+ * Author : Linus Walleij <linus.walleij@linaro.org>
+ */
+
+#include <linux/backlight.h>
+#include <linux/err.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/mfd/ipaq-micro.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+static int micro_bl_update_status(struct backlight_device *bd)
+{
+ struct ipaq_micro *micro = dev_get_drvdata(&bd->dev);
+ int intensity = bd->props.brightness;
+ struct ipaq_micro_msg msg = {
+ .id = MSG_BACKLIGHT,
+ .tx_len = 3,
+ };
+
+ if (bd->props.power != FB_BLANK_UNBLANK)
+ intensity = 0;
+ if (bd->props.state & (BL_CORE_FBBLANK | BL_CORE_SUSPENDED))
+ intensity = 0;
+
+ /*
+ * Message format:
+ * Byte 0: backlight instance (usually 1)
+ * Byte 1: on/off
+ * Byte 2: intensity, 0-255
+ */
+ msg.tx_data[0] = 0x01;
+ msg.tx_data[1] = intensity > 0 ? 1 : 0;
+ msg.tx_data[2] = intensity;
+ return ipaq_micro_tx_msg_sync(micro, &msg);
+}
+
+static const struct backlight_ops micro_bl_ops = {
+ .options = BL_CORE_SUSPENDRESUME,
+ .update_status = micro_bl_update_status,
+};
+
+static struct backlight_properties micro_bl_props = {
+ .type = BACKLIGHT_RAW,
+ .max_brightness = 255,
+ .power = FB_BLANK_UNBLANK,
+ .brightness = 64,
+};
+
+static int micro_backlight_probe(struct platform_device *pdev)
+{
+ struct backlight_device *bd;
+ struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent);
+
+ bd = devm_backlight_device_register(&pdev->dev, "ipaq-micro-backlight",
+ &pdev->dev, micro, &micro_bl_ops,
+ &micro_bl_props);
+ if (IS_ERR(bd))
+ return PTR_ERR(bd);
+
+ platform_set_drvdata(pdev, bd);
+ backlight_update_status(bd);
+
+ return 0;
+}
+
+struct platform_driver micro_backlight_device_driver = {
+ .driver = {
+ .name = "ipaq-micro-backlight",
+ },
+ .probe = micro_backlight_probe,
+};
+module_platform_driver(micro_backlight_device_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("driver for iPAQ Atmel micro backlight");
+MODULE_ALIAS("platform:ipaq-micro-backlight");
--
1.9.3


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