[PATCH 1/1] OMAP: DSS2: Add TI Boxer display panel driver

[Javier Martinez Canillas <martinez.javier@gmail.com>]

Add panel driver for TI Boxer LCD.

This panel is used on many embedded devices such as
Barnes & Nobles's Nook Color e-reader.

Signed-off-by: Javier Martinez Canillas <martinez.javier@gmail.com>
---
 drivers/video/omap2/displays/Kconfig       |    6 +
 drivers/video/omap2/displays/Makefile      |    1 +
 drivers/video/omap2/displays/panel-boxer.c |  333 ++++++++++++++++++++++++++++
 3 files changed, 340 insertions(+), 0 deletions(-)
 create mode 100644 drivers/video/omap2/displays/panel-boxer.c

diff --git a/drivers/video/omap2/displays/Kconfig b/drivers/video/omap2/displays/Kconfig
index 609a280..6c9fe26 100644
--- a/drivers/video/omap2/displays/Kconfig
+++ b/drivers/video/omap2/displays/Kconfig
@@ -48,4 +48,10 @@ config PANEL_ACX565AKM
 	select BACKLIGHT_CLASS_DEVICE
 	help
 	  This is the LCD panel used on Nokia N900
+
+config PANEL_BOXER
+        tristate "TI Boxer Panel"
+        help
+          LCD Panel used in the TI Boxer
+
 endmenu
diff --git a/drivers/video/omap2/displays/Makefile b/drivers/video/omap2/displays/Makefile
index 0f601ab3a..26c662e 100644
--- a/drivers/video/omap2/displays/Makefile
+++ b/drivers/video/omap2/displays/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_PANEL_NEC_NL8048HL11_01B) += panel-nec-nl8048hl11-01b.o
 obj-$(CONFIG_PANEL_TAAL) += panel-taal.o
 obj-$(CONFIG_PANEL_TPO_TD043MTEA1) += panel-tpo-td043mtea1.o
 obj-$(CONFIG_PANEL_ACX565AKM) += panel-acx565akm.o
+obj-$(CONFIG_PANEL_BOXER) += panel-boxer.o
diff --git a/drivers/video/omap2/displays/panel-boxer.c b/drivers/video/omap2/displays/panel-boxer.c
new file mode 100644
index 0000000..6429960
--- /dev/null
+++ b/drivers/video/omap2/displays/panel-boxer.c
@@ -0,0 +1,333 @@
+/*
+ * Boxer panel support
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
+ *
+ * Copyright (c) 2010 Barnes & Noble
+ * David Bolcsfoldi <dbolcsfoldi@intrinsyc.com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
+#include <linux/regulator/consumer.h>
+#include <linux/err.h>
+#include <linux/workqueue.h>
+
+#include <plat/mcspi.h>
+#include <mach/gpio.h>
+#include <mach/gpio.h>
+#include <plat/mux.h>
+#include <asm/mach-types.h>
+
+#include <video/omapdss.h>
+
+/* Delay between Panel configuration and Panel enabling */
+#define LCD_RST_DELAY		100
+#define LCD_INIT_DELAY		200
+
+#define LCD_XRES		1024
+#define LCD_YRES		600
+
+#define LCD_PIXCLOCK_MIN	39000 /* CPT MIN PIX Clock is 39MHz */
+#define Lcd_Pixclock_Typ	45000 /* Typical PIX clock is 45MHz */
+#define LCD_PIXCLOCK_MAX	52000 /* Maximum is 52MHz */
+
+/* Current Pixel clock */
+#define LCD_PIXEL_CLOCK		68000
+
+static struct workqueue_struct *boxer_panel_wq;
+static struct omap_dss_device *boxer_panel_dssdev;
+static struct regulator *boxer_panel_regulator;
+static struct spi_device *boxer_spi_device;
+static atomic_t boxer_panel_is_enabled = ATOMIC_INIT(0);
+
+/*NEC NL8048HL11-01B  Manual
+ * defines HFB, HSW, HBP, VFP, VSW, VBP as shown below
+ */
+
+static struct omap_video_timings boxer_panel_timings = {
+	/* 1024 x 600 @ 60 Hz  Reduced blanking VESA CVT 0.31M3-R */
+	.x_res          = LCD_XRES,
+	.y_res          = LCD_YRES,
+	.pixel_clock    = LCD_PIXEL_CLOCK,
+	.hfp            = 48,
+	.hsw            = 40,
+	.hbp            = 65,
+	.vfp            = 3,
+	.vsw            = 10,
+	.vbp            = 25,
+};
+
+static void boxer_get_resolution(struct omap_dss_device *dssdev,
+				 u16 *xres, u16 *yres)
+{
+
+	*xres = dssdev->panel.timings.x_res;
+	*yres = dssdev->panel.timings.y_res;
+}
+
+int boxer_get_recommended_bpp(struct omap_dss_device *dssdev)
+{
+	return 24;
+}
+
+
+static int boxer_panel_probe(struct omap_dss_device *dssdev)
+{
+	dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_IVS |
+		OMAP_DSS_LCD_IHS | OMAP_DSS_LCD_IPC;
+	dssdev->panel.timings = boxer_panel_timings;
+	return 0;
+}
+
+static void boxer_panel_remove(struct omap_dss_device *dssdev)
+{
+}
+
+static int spi_send(struct spi_device *spi, unsigned char reg_addr,
+		    unsigned char reg_data)
+{
+	int ret = 0;
+	uint16_t msg;
+	msg = (reg_addr << 10) | reg_data;
+
+	if (spi_write(spi, (unsigned char *)&msg, 2))
+		printk(KERN_ERR "error in spi_write %x\n", msg);
+
+	udelay(10);
+
+	return ret;
+}
+
+static void boxer_init_panel(void)
+{
+	spi_send(boxer_spi_device, 0, 0x00);
+
+	spi_send(boxer_spi_device,   0, 0xad);
+	spi_send(boxer_spi_device,   1, 0x30);
+	spi_send(boxer_spi_device,   2, 0x40);
+	spi_send(boxer_spi_device, 0xe, 0x5f);
+	spi_send(boxer_spi_device, 0xf, 0xa4);
+	spi_send(boxer_spi_device, 0xd, 0x00);
+	spi_send(boxer_spi_device, 0x2, 0x43);
+	spi_send(boxer_spi_device, 0xa, 0x28);
+	spi_send(boxer_spi_device, 0x10, 0x41);
+}
+
+static void boxer_panel_work_func(struct work_struct *work)
+{
+	if (!regulator_is_enabled(boxer_panel_regulator))
+		regulator_enable(boxer_panel_regulator);
+
+	msleep(LCD_RST_DELAY);
+
+	boxer_spi_device->mode = SPI_MODE_0;
+	boxer_spi_device->bits_per_word = 16;
+	spi_setup(boxer_spi_device);
+
+	boxer_init_panel();
+
+	msleep(LCD_INIT_DELAY);
+
+	if (boxer_panel_dssdev->platform_enable)
+		boxer_panel_dssdev->platform_enable(boxer_panel_dssdev);
+}
+
+static DECLARE_WORK(boxer_panel_work, boxer_panel_work_func);
+
+static int boxer_panel_enable(struct omap_dss_device *dssdev)
+{
+	if (atomic_add_unless(&boxer_panel_is_enabled, 1, 1)) {
+		boxer_panel_dssdev = dssdev;
+		queue_work(boxer_panel_wq, &boxer_panel_work);
+	}
+
+	return 0;
+}
+
+static void boxer_panel_disable(struct omap_dss_device *dssdev)
+{
+	if (atomic_dec_and_test(&boxer_panel_is_enabled)) {
+		cancel_work_sync(&boxer_panel_work);
+
+		if (dssdev->platform_disable)
+			dssdev->platform_disable(dssdev);
+
+		if (regulator_is_enabled(boxer_panel_regulator))
+			regulator_disable(boxer_panel_regulator);
+	} else {
+		printk(KERN_WARNING "%s: attempting to disable panel twice!\n",
+		       __func__);
+		WARN_ON(1);
+	}
+}
+
+static int boxer_panel_suspend(struct omap_dss_device *dssdev)
+{
+	boxer_panel_disable(dssdev);
+	return 0;
+}
+
+static int boxer_panel_resume(struct omap_dss_device *dssdev)
+{
+	return boxer_panel_enable(dssdev);
+}
+
+static struct omap_dss_driver boxer_driver = {
+	.probe          = boxer_panel_probe,
+	.remove         = boxer_panel_remove,
+
+	.enable         = boxer_panel_enable,
+	.disable        = boxer_panel_disable,
+	.suspend        = boxer_panel_suspend,
+	.resume         = boxer_panel_resume,
+	.get_resolution = boxer_get_resolution,
+	.get_recommended_bpp = boxer_get_recommended_bpp,
+	.driver		= {
+		.name	= "boxer_panel",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static ssize_t lcd_reg_store(struct device *dev, struct device_attribute *attr,
+			     const char *buf, size_t count)
+{
+	int argc;
+	char **args;
+	unsigned long r, val;
+	int ret;
+
+	struct spi_device *spi = to_spi_device(dev);
+
+	args = argv_split(GFP_KERNEL, buf, &argc);
+
+	if (args = NULL) {
+		dev_err(dev, "error getting arguments\n");
+		return count;
+	}
+
+	if (argc = 2) {
+		ret = strict_strtoul(*args, 0, (unsigned long *)&r);
+		if (ret)
+			return ret;
+		args++;
+		ret = strict_strtoul(*args, 0, (unsigned long *)&val);
+		if (ret)
+			return ret;
+		dev_info(dev, "set lcd panel spi reg %lu = %lu\n", r, val);
+		spi_send(spi, r, val);
+	}
+	argv_free(args);
+
+	return count;
+}
+
+
+static DEVICE_ATTR(lcd_reg, S_IWUSR, NULL, lcd_reg_store);
+
+static struct attribute *boxer_lcd_spi_attributes[] = {
+	&dev_attr_lcd_reg,
+	NULL
+};
+
+
+static struct attribute_group boxer_lcd_spi_attributes_group = {
+	.attrs = boxer_lcd_spi_attributes,
+};
+
+
+
+static int boxer_spi_probe(struct spi_device *spi)
+{
+	spi->mode = SPI_MODE_0;
+	spi->bits_per_word = 16;
+	spi_setup(spi);
+
+	boxer_spi_device = spi;
+
+	boxer_init_panel();
+
+	if (sysfs_create_group(&spi->dev.kobj, &boxer_lcd_spi_attributes_group))
+		printk(KERN_WARNING "error creating sysfs entries\n");
+
+	omap_dss_register_driver(&boxer_driver);
+	return 0;
+}
+
+static int boxer_spi_remove(struct spi_device *spi)
+{
+	sysfs_remove_group(&spi->dev.kobj, &boxer_lcd_spi_attributes_group);
+	omap_dss_unregister_driver(&boxer_driver);
+
+	return 0;
+}
+
+
+static struct spi_driver boxer_spi_driver = {
+	.probe           = boxer_spi_probe,
+	.remove	= __devexit_p(boxer_spi_remove),
+	.driver         = {
+		.name   = "boxer_disp_spi",
+		.bus    = &spi_bus_type,
+		.owner  = THIS_MODULE,
+	},
+};
+
+static int __init boxer_lcd_init(void)
+{
+	int ret = 0;
+
+	boxer_panel_wq = create_singlethread_workqueue("boxer-panel-wq");
+
+	printk(KERN_WARNING "Enabling power for LCD\n");
+	boxer_panel_regulator = regulator_get(NULL, "vlcd");
+
+	if (IS_ERR(boxer_panel_regulator)) {
+		printk(KERN_ERR "Unable to get vlcd regulator, reason: %ld!\n",
+		       IS_ERR(boxer_panel_regulator));
+		ret = -ENODEV;
+		goto out;
+	}
+
+	ret = regulator_enable(boxer_panel_regulator);
+
+	if (ret) {
+		printk(KERN_ERR "Failed to enable regulator vlcd!\n");
+		regulator_put(boxer_panel_regulator);
+		goto out;
+	}
+
+	return spi_register_driver(&boxer_spi_driver);
+out:
+	return ret;
+}
+
+static void __exit boxer_lcd_exit(void)
+{
+	spi_unregister_driver(&boxer_spi_driver);
+	regulator_disable(boxer_panel_regulator);
+	regulator_put(boxer_panel_regulator);
+	destroy_workqueue(boxer_panel_wq);
+}
+
+
+module_init(boxer_lcd_init);
+module_exit(boxer_lcd_exit);
+MODULE_LICENSE("GPL");
+
-- 
1.7.4.1