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309 lines
8.6 KiB
Diff
Executable File
309 lines
8.6 KiB
Diff
Executable File
From deee418974cd5cc3b1aa9b1329d91b50f8bb7baf Mon Sep 17 00:00:00 2001
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From: mokopatches <mokopatches@openmoko.org>
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Date: Wed, 16 Jul 2008 14:44:49 +0100
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Subject: [PATCH] gta01-backlight.patch
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This is a backlight driver for the FIC/OpenMoko Neo1973 GTA01 GSM Phone
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Signed-off-by: Harald Welte <laforge@openmoko.org>
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---
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drivers/video/backlight/Kconfig | 7 +
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drivers/video/backlight/Makefile | 1 +
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drivers/video/backlight/gta01_bl.c | 255 ++++++++++++++++++++++++++++++++++++
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3 files changed, 263 insertions(+), 0 deletions(-)
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create mode 100644 drivers/video/backlight/gta01_bl.c
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diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
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index dcd8073..475db76 100644
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--- a/drivers/video/backlight/Kconfig
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+++ b/drivers/video/backlight/Kconfig
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@@ -89,6 +89,13 @@ config BACKLIGHT_OMAP1
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the PWL module of OMAP1 processors. Say Y if your board
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uses this hardware.
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+config BACKLIGHT_GTA01
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+ tristate "FIC Neo1973 GTA01 Backlight Driver"
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+ depends on BACKLIGHT_CLASS_DEVICE && MACH_NEO1973_GTA01
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+ default y
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+ help
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+ If you have a FIC Neo1973 GTA01, say y to enable the backlight driver.
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+
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config BACKLIGHT_HP680
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tristate "HP Jornada 680 Backlight Driver"
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depends on BACKLIGHT_CLASS_DEVICE && SH_HP6XX
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diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
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index 33f6c7c..aee9f46 100644
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--- a/drivers/video/backlight/Makefile
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+++ b/drivers/video/backlight/Makefile
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@@ -5,6 +5,7 @@ obj-$(CONFIG_LCD_LTV350QV) += ltv350qv.o
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obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
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obj-$(CONFIG_BACKLIGHT_CORGI) += corgi_bl.o
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+obj-$(CONFIG_BACKLIGHT_GTA01) += gta01_bl.o
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obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o
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obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o
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obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o
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diff --git a/drivers/video/backlight/gta01_bl.c b/drivers/video/backlight/gta01_bl.c
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new file mode 100644
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index 0000000..c2bf0c9
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--- /dev/null
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+++ b/drivers/video/backlight/gta01_bl.c
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@@ -0,0 +1,255 @@
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+/*
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+ * Backlight Driver for FIC GTA01 (Neo1973) GSM Phone
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+ *
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+ * Copyright (C) 2006-2007 by OpenMoko, Inc.
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+ * Author: Harald Welte <laforge@openmoko.org>
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+ * All rights reserved.
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+ *
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+ * based on corgi_cl.c, Copyright (c) 2004-2006 Richard Purdie
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License as
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+ * published by the Free Software Foundation, version 2.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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+ * MA 02111-1307 USA
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+ *
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+ * Javi Roman <javiroman@kernel-labs.org>:
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+ * implement PWM, instead of simple on/off switching
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+ *
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+ */
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+
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+#include <linux/module.h>
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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/mutex.h>
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+#include <linux/fb.h>
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+#include <linux/backlight.h>
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+#include <linux/clk.h>
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+
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+#include <asm/arch/hardware.h>
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+#include <asm/arch/gta01.h>
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+#include <asm/arch/pwm.h>
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+
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+#include <asm/plat-s3c/regs-timer.h>
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+
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+static struct backlight_properties gta01bl_prop;
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+static struct backlight_device *gta01_backlight_device;
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+static struct gta01bl_machinfo *bl_machinfo;
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+
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+static unsigned long gta01bl_flags;
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+
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+struct gta01bl_data {
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+ int intensity;
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+ struct mutex mutex;
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+ struct clk *clk;
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+ struct s3c2410_pwm pwm;
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+};
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+
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+static struct gta01bl_data gta01bl;
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+
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+#define GTA01BL_SUSPENDED 0x01
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+#define GTA01BL_BATTLOW 0x02
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+
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+/* On the GTA01 / Neo1973, we use a 50 or 66MHz PCLK, which gives
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+ * us a 6.25..8.25MHz DIV8 clock, which is further divided by a
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+ * prescaler of 4, resulting in a 1.56..2.06MHz tick. This results in a
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+ * minimum frequency of 24..31Hz. At 400Hz, we need to set the count
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+ * to something like 3906..5156, providing us a way sufficient resolution
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+ * for display brightness adjustment. */
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+#define GTA01BL_COUNTER 5156
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+
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+static int gta01bl_send_intensity(struct backlight_device *bd)
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+{
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+ int intensity = bd->props.brightness;
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+
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+ if (bd->props.power != FB_BLANK_UNBLANK)
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+ intensity = 0;
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+ if (bd->props.fb_blank != FB_BLANK_UNBLANK)
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+ intensity = 0;
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+ if (gta01bl_flags & GTA01BL_SUSPENDED)
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+ intensity = 0;
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+ if (gta01bl_flags & GTA01BL_BATTLOW)
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+ intensity &= bl_machinfo->limit_mask;
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+
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+ mutex_lock(>a01bl.mutex);
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+#ifdef GTA01_BACKLIGHT_ONOFF_ONLY
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+ if (intensity)
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+ s3c2410_gpio_setpin(GTA01_GPIO_BACKLIGHT, 1);
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+ else
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+ s3c2410_gpio_setpin(GTA01_GPIO_BACKLIGHT, 0);
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+#else
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+ if (intensity == bd->props.max_brightness) {
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+ s3c2410_gpio_setpin(GTA01_GPIO_BACKLIGHT, 1);
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+ s3c2410_gpio_cfgpin(GTA01_GPIO_BACKLIGHT, S3C2410_GPIO_OUTPUT);
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+ } else {
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+ s3c2410_pwm_duty_cycle(intensity & 0xffff, >a01bl.pwm);
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+ s3c2410_gpio_cfgpin(GTA01_GPIO_BACKLIGHT, S3C2410_GPB0_TOUT0);
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+ }
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+#endif
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+ mutex_unlock(>a01bl.mutex);
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+
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+ gta01bl.intensity = intensity;
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+ return 0;
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+}
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+
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+static int gta01bl_init_hw(void)
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+{
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+ int rc;
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+
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+ rc = s3c2410_pwm_init(>a01bl.pwm);
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+ if (rc)
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+ return rc;
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+
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+ gta01bl.pwm.timerid = PWM0;
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+ gta01bl.pwm.prescaler = (4 - 1);
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+ gta01bl.pwm.divider = S3C2410_TCFG1_MUX0_DIV8;
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+ gta01bl.pwm.counter = GTA01BL_COUNTER;
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+ gta01bl.pwm.comparer = gta01bl.pwm.counter;
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+
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+ rc = s3c2410_pwm_enable(>a01bl.pwm);
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+ if (rc)
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+ return rc;
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+
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+ s3c2410_pwm_start(>a01bl.pwm);
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+
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+ gta01bl_prop.max_brightness = gta01bl.pwm.counter;
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+
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+ return 0;
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+}
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+
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+#ifdef CONFIG_PM
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+static int gta01bl_suspend(struct platform_device *dev, pm_message_t state)
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+{
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+ gta01bl_flags |= GTA01BL_SUSPENDED;
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+ gta01bl_send_intensity(gta01_backlight_device);
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+ return 0;
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+}
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+
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+static int gta01bl_resume(struct platform_device *dev)
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+{
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+ mutex_lock(>a01bl.mutex);
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+ gta01bl_init_hw();
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+ mutex_unlock(>a01bl.mutex);
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+
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+ gta01bl_flags &= ~GTA01BL_SUSPENDED;
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+ gta01bl_send_intensity(gta01_backlight_device);
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+ return 0;
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+}
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+#else
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+#define gta01bl_suspend NULL
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+#define gta01bl_resume NULL
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+#endif
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+
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+static int gta01bl_get_intensity(struct backlight_device *bd)
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+{
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+ return gta01bl.intensity;
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+}
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+
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+static int gta01bl_set_intensity(struct backlight_device *bd)
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+{
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+ gta01bl_send_intensity(gta01_backlight_device);
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+ return 0;
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+}
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+
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+/*
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+ * Called when the battery is low to limit the backlight intensity.
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+ * If limit==0 clear any limit, otherwise limit the intensity
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+ */
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+void gta01bl_limit_intensity(int limit)
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+{
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+ if (limit)
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+ gta01bl_flags |= GTA01BL_BATTLOW;
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+ else
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+ gta01bl_flags &= ~GTA01BL_BATTLOW;
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+ gta01bl_send_intensity(gta01_backlight_device);
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+}
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+EXPORT_SYMBOL_GPL(gta01bl_limit_intensity);
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+
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+
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+static struct backlight_ops gta01bl_ops = {
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+ .get_brightness = gta01bl_get_intensity,
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+ .update_status = gta01bl_set_intensity,
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+};
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+
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+static int __init gta01bl_probe(struct platform_device *pdev)
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+{
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+ struct gta01bl_machinfo *machinfo = pdev->dev.platform_data;
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+ int rc;
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+
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+#ifdef GTA01_BACKLIGHT_ONOFF_ONLY
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+ s3c2410_gpio_cfgpin(GTA01_GPIO_BACKLIGHT, S3C2410_GPIO_OUTPUT);
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+ gta01bl_prop.max_brightness = 1;
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+#else
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+ rc = gta01bl_init_hw();
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+ if (rc < 0)
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+ return rc;
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+#endif
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+ mutex_init(>a01bl.mutex);
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+
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+ if (!machinfo->limit_mask)
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+ machinfo->limit_mask = -1;
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+
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+ gta01_backlight_device = backlight_device_register("gta01-bl",
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+ &pdev->dev, NULL,
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+ >a01bl_ops);
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+ if (IS_ERR(gta01_backlight_device))
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+ return PTR_ERR(gta01_backlight_device);
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+
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+ gta01bl_prop.power = FB_BLANK_UNBLANK;
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+ gta01bl_prop.brightness = gta01bl_prop.max_brightness;
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+ memcpy(>a01_backlight_device->props,
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+ >a01bl_prop, sizeof(gta01bl_prop));
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+ gta01bl_send_intensity(gta01_backlight_device);
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+
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+ return 0;
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+}
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+
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+static int gta01bl_remove(struct platform_device *dev)
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+{
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+#ifndef GTA01_BACKLIGHT_ONOFF_ONLY
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+ s3c2410_pwm_disable(>a01bl.pwm);
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+#endif
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+ backlight_device_unregister(gta01_backlight_device);
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+ mutex_destroy(>a01bl.mutex);
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+
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+ s3c2410_gpio_cfgpin(GTA01_GPIO_BACKLIGHT, S3C2410_GPIO_OUTPUT);
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+ s3c2410_gpio_setpin(GTA01_GPIO_BACKLIGHT, 1);
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+
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+ return 0;
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+}
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+
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+static struct platform_driver gta01bl_driver = {
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+ .probe = gta01bl_probe,
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+ .remove = gta01bl_remove,
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+ .suspend = gta01bl_suspend,
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+ .resume = gta01bl_resume,
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+ .driver = {
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+ .name = "gta01-bl",
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+ },
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+};
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+
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+static int __init gta01bl_init(void)
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+{
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+ return platform_driver_register(>a01bl_driver);
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+}
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+
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+static void __exit gta01bl_exit(void)
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+{
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+ platform_driver_unregister(>a01bl_driver);
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+}
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+
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+module_init(gta01bl_init);
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+module_exit(gta01bl_exit);
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+
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+MODULE_DESCRIPTION("FIC GTA01 (Neo1973) Backlight Driver");
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+MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
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+MODULE_LICENSE("GPL");
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--
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1.5.6.3
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