mirror of
https://git.yoctoproject.org/meta-ti
synced 2026-07-16 14:27:48 +00:00
Koen Kooi
243 lines
6.3 KiB
Diff
243 lines
6.3 KiB
Diff
From e707458df28487c2fb0bf620cb3eff22466e2c6c Mon Sep 17 00:00:00 2001
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From: Koen Kooi <koen@dominion.thruhere.net>
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Date: Thu, 20 Oct 2011 16:13:16 +0200
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Subject: [PATCH 4/4] LEDS: add initial support for WS2801 controller
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This adds initial support for the WS2801 RGB LED controller.
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Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
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---
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arch/arm/mach-omap2/board-omap3beagle.c | 11 ++
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drivers/leds/Kconfig | 6 +
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drivers/leds/Makefile | 1 +
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drivers/leds/leds-ws2801.c | 159 +++++++++++++++++++++++++++++++
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4 files changed, 177 insertions(+), 0 deletions(-)
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create mode 100644 drivers/leds/leds-ws2801.c
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diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
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index 47bc79b..016d0985 100644
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--- a/arch/arm/mach-omap2/board-omap3beagle.c
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+++ b/arch/arm/mach-omap2/board-omap3beagle.c
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@@ -796,6 +796,11 @@ static struct platform_device leds_gpio = {
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},
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};
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+static struct platform_device ws2801_leds = {
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+ .name = "ws2801-leds",
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+ .id = -1,
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+};
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+
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static struct gpio_keys_button gpio_buttons[] = {
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{
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.code = BTN_EXTRA,
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@@ -1014,6 +1019,12 @@ static void __init omap3_beagle_init(void)
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ARRAY_SIZE(beagle_i2c2_bbtoys_ulcd));
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}
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+ if(!strcmp(expansionboard_name, "beacon"))
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+ {
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+ printk(KERN_INFO "Beagle expansionboard: registering TinCanTools Beacon LED driver\n");
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+ platform_device_register(&ws2801_leds);
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+ }
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+
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usb_musb_init(NULL);
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usbhs_init(&usbhs_bdata);
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omap_nand_flash_init(NAND_BUSWIDTH_16, omap3beagle_nand_partitions,
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diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
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index 713d43b..fd2c4b3 100644
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--- a/drivers/leds/Kconfig
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+++ b/drivers/leds/Kconfig
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@@ -323,6 +323,12 @@ config LEDS_BD2802
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This option enables support for BD2802GU RGB LED driver chips
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accessed via the I2C bus.
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+config LEDS_WS2801
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+ tristate "LED driver for WS2801 RGB LED"
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+ depends on LEDS_CLASS
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+ help
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+ This option enables support for WS2801 RGB LED driver chips.
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+
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config LEDS_INTEL_SS4200
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tristate "LED driver for Intel NAS SS4200 series"
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depends on LEDS_CLASS
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diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
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index bbfd2e3..14f849e 100644
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--- a/drivers/leds/Makefile
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+++ b/drivers/leds/Makefile
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@@ -43,6 +43,7 @@ obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o
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obj-$(CONFIG_LEDS_NS2) += leds-ns2.o
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obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o
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obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o
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+obj-$(CONFIG_LEDS_WS2801) += leds-ws2801.o
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# LED SPI Drivers
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obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
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diff --git a/drivers/leds/leds-ws2801.c b/drivers/leds/leds-ws2801.c
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new file mode 100644
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index 0000000..9526a84
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--- /dev/null
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+++ b/drivers/leds/leds-ws2801.c
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@@ -0,0 +1,159 @@
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+/*
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+ * LEDs driver for WS2801 RGB Controller
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+ *
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+ * Copyright (C) 2006 Kristian Kielhofner <kris@krisk.org>
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+ *
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+ * Based on leds-net48xx.c
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/init.h>
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+#include <linux/platform_device.h>
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+#include <linux/leds.h>
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+#include <linux/err.h>
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+#include <linux/gpio.h>
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+#include <linux/io.h>
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+
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+#define DRVNAME "ws2801-leds"
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+#define WS2801_LED_CLOCK_GPIO 159
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+#define WS2801_LED_DATA_GPIO 158
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+
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+static unsigned long rgb_color;
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+
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+static struct platform_device *pdev;
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+
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+static void ws2801_set_rgb(void)
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+{
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+ int count;
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+ int color_bit;
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+
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+ for (count = 23; count >= 0 ; count--) {
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+ color_bit = (rgb_color>>count) & (1<<0);
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+ gpio_set_value(WS2801_LED_DATA_GPIO, color_bit);
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+ gpio_set_value(WS2801_LED_CLOCK_GPIO, 1);
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+ gpio_set_value(WS2801_LED_CLOCK_GPIO, 0);
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+ }
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+
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+}
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+
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+static void ws2801_red_led_set(struct led_classdev *led_cdev,
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+ enum led_brightness value)
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+{
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+ rgb_color &= ((0x00<<16)|(0xff<<8)|(0xff<<0));
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+ rgb_color |= (value<<16);
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+ ws2801_set_rgb();
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+}
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+
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+static void ws2801_green_led_set(struct led_classdev *led_cdev,
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+ enum led_brightness value)
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+{
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+ rgb_color &= ((0xff<<16)|(0x00<<8)|(0xff<<0));
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+ rgb_color |= (value<<8);
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+ ws2801_set_rgb();
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+}
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+
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+static void ws2801_blue_led_set(struct led_classdev *led_cdev,
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+ enum led_brightness value)
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+{
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+ rgb_color &= ((0xff<<16)|(0xff<<8)|(0x00<<0));
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+ rgb_color |= (value<<0);
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+ ws2801_set_rgb();
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+}
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+
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+static struct led_classdev ws2801_red_led = {
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+ .name = "ws2801-red",
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+ .brightness_set = ws2801_red_led_set,
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+ .flags = LED_CORE_SUSPENDRESUME,
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+};
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+
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+static struct led_classdev ws2801_green_led = {
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+ .name = "ws2801-green",
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+ .brightness_set = ws2801_green_led_set,
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+ .flags = LED_CORE_SUSPENDRESUME,
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+};
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+
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+static struct led_classdev ws2801_blue_led = {
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+ .name = "ws2801-blue",
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+ .brightness_set = ws2801_blue_led_set,
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+ .flags = LED_CORE_SUSPENDRESUME,
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+};
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+
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+static int ws2801_led_probe(struct platform_device *pdev)
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+{
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+ int ret;
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+
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+ ret = led_classdev_register(&pdev->dev, &ws2801_red_led);
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+ if (ret < 0)
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+ return ret;
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+
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+ ret = led_classdev_register(&pdev->dev, &ws2801_green_led);
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+ if (ret < 0)
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+ goto err1;
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+
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+ ret = led_classdev_register(&pdev->dev, &ws2801_blue_led);
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+ if (ret < 0)
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+ goto err2;
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+
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+ gpio_request_one(WS2801_LED_DATA_GPIO,
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+ GPIOF_OUT_INIT_LOW, "ws2801_data");
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+
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+ gpio_request_one(WS2801_LED_CLOCK_GPIO,
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+ GPIOF_OUT_INIT_LOW, "ws2801_clock");
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+
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+ ws2801_set_rgb();
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+ return ret;
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+
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+err2:
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+ led_classdev_unregister(&ws2801_green_led);
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+err1:
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+ led_classdev_unregister(&ws2801_red_led);
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+
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+ return ret;
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+}
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+
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+static int ws2801_led_remove(struct platform_device *pdev)
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+{
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+ led_classdev_unregister(&ws2801_red_led);
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+ led_classdev_unregister(&ws2801_green_led);
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+ led_classdev_unregister(&ws2801_blue_led);
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+ return 0;
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+}
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+
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+static struct platform_driver ws2801_led_driver = {
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+ .probe = ws2801_led_probe,
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+ .remove = ws2801_led_remove,
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+ .driver = {
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+ .name = DRVNAME,
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+ .owner = THIS_MODULE,
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+ },
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+};
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+
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+static int __init ws2801_led_init(void)
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+{
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+ int ret;
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+
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+ ret = platform_driver_register(&ws2801_led_driver);
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+ if (ret < 0)
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+ goto out;
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+
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+out:
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+ return ret;
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+}
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+
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+static void __exit ws2801_led_exit(void)
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+{
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+ platform_device_unregister(pdev);
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+ platform_driver_unregister(&ws2801_led_driver);
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+}
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+
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+module_init(ws2801_led_init);
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+module_exit(ws2801_led_exit);
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+
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+MODULE_AUTHOR("David Anders <danders@tincantools.com>");
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+MODULE_DESCRIPTION("WS2801 RGB LED driver");
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+MODULE_LICENSE("GPL");
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+
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--
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1.7.2.5
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