OMAP: DSS2: Add support for LG Philips LB035Q02 panel

This patch adds support for the Gumstix Palo35 expansion board
which utilizes the 320 x 240 pixel LG.Philips LB035Q02 LCD Panel

Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

3 files changed, 286 insertions, 0 deletions

diff --git a/drivers/video/omap2/displays/Kconfig b/drivers/video/omap2/displays/Kconfig
index 940cab394c2e..d18ad6b2372a 100644
--- a/drivers/video/omap2/displays/Kconfig
+++ b/drivers/video/omap2/displays/Kconfig
@@ -9,6 +9,12 @@ config PANEL_GENERIC_DPI
           Supports LCD Panel used in TI SDP3430 and EVM boards,
           OMAP3517 EVM boards and CM-T35.
 
+config PANEL_LGPHILIPS_LB035Q02
+        tristate "LG.Philips LB035Q02 LCD Panel"
+        depends on OMAP2_DSS && SPI
+        help
+          LCD Panel used on the Gumstix Overo Palo35
+
 config PANEL_SHARP_LS037V7DW01
         tristate "Sharp LS037V7DW01 LCD Panel"
         depends on OMAP2_DSS
diff --git a/drivers/video/omap2/displays/Makefile b/drivers/video/omap2/displays/Makefile
index 861f0255ec6b..0f601ab3abf4 100644
--- a/drivers/video/omap2/displays/Makefile
+++ b/drivers/video/omap2/displays/Makefile
@@ -1,4 +1,5 @@
 obj-$(CONFIG_PANEL_GENERIC_DPI) += panel-generic-dpi.o
+obj-$(CONFIG_PANEL_LGPHILIPS_LB035Q02) += panel-lgphilips-lb035q02.o
 obj-$(CONFIG_PANEL_SHARP_LS037V7DW01) += panel-sharp-ls037v7dw01.o
 obj-$(CONFIG_PANEL_NEC_NL8048HL11_01B) += panel-nec-nl8048hl11-01b.o
 
diff --git a/drivers/video/omap2/displays/panel-lgphilips-lb035q02.c b/drivers/video/omap2/displays/panel-lgphilips-lb035q02.c
new file mode 100644
index 000000000000..271324db2436
--- /dev/null
+++ b/drivers/video/omap2/displays/panel-lgphilips-lb035q02.c
@@ -0,0 +1,279 @@
+/*
+ * LCD panel driver for LG.Philips LB035Q02
+ *
+ * Author: Steve Sakoman <steve@sakoman.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/delay.h>
+#include <linux/spi/spi.h>
+#include <linux/mutex.h>
+
+#include <plat/display.h>
+
+struct lb035q02_data {
+        struct mutex lock;
+};
+
+static struct omap_video_timings lb035q02_timings = {
+        .x_res = 320,
+        .y_res = 240,
+
+        .pixel_clock    = 6500,
+
+        .hsw            = 2,
+        .hfp            = 20,
+        .hbp            = 68,
+
+        .vsw            = 2,
+        .vfp            = 4,
+        .vbp            = 18,
+};
+
+static int lb035q02_panel_power_on(struct omap_dss_device *dssdev)
+{
+        int r;
+
+        if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
+                return 0;
+
+        r = omapdss_dpi_display_enable(dssdev);
+        if (r)
+                goto err0;
+
+        if (dssdev->platform_enable) {
+                r = dssdev->platform_enable(dssdev);
+                if (r)
+                        goto err1;
+        }
+
+        return 0;
+err1:
+        omapdss_dpi_display_disable(dssdev);
+err0:
+        return r;
+}
+
+static void lb035q02_panel_power_off(struct omap_dss_device *dssdev)
+{
+        if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
+                return;
+
+        if (dssdev->platform_disable)
+                dssdev->platform_disable(dssdev);
+
+        omapdss_dpi_display_disable(dssdev);
+}
+
+static int lb035q02_panel_probe(struct omap_dss_device *dssdev)
+{
+        struct lb035q02_data *ld;
+        int r;
+
+        dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_IVS |
+                OMAP_DSS_LCD_IHS;
+        dssdev->panel.timings = lb035q02_timings;
+
+        ld = kzalloc(sizeof(*ld), GFP_KERNEL);
+        if (!ld) {
+                r = -ENOMEM;
+                goto err;
+        }
+        mutex_init(&ld->lock);
+        dev_set_drvdata(&dssdev->dev, ld);
+        return 0;
+err:
+        return r;
+}
+
+static void lb035q02_panel_remove(struct omap_dss_device *dssdev)
+{
+        struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
+
+        kfree(ld);
+}
+
+static int lb035q02_panel_enable(struct omap_dss_device *dssdev)
+{
+        struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
+        int r;
+
+        mutex_lock(&ld->lock);
+
+        r = lb035q02_panel_power_on(dssdev);
+        if (r)
+                goto err;
+        dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+
+        mutex_unlock(&ld->lock);
+        return 0;
+err:
+        mutex_unlock(&ld->lock);
+        return r;
+}
+
+static void lb035q02_panel_disable(struct omap_dss_device *dssdev)
+{
+        struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
+
+        mutex_lock(&ld->lock);
+
+        lb035q02_panel_power_off(dssdev);
+        dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
+
+        mutex_unlock(&ld->lock);
+}
+
+static int lb035q02_panel_suspend(struct omap_dss_device *dssdev)
+{
+        struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
+
+        mutex_lock(&ld->lock);
+
+        lb035q02_panel_power_off(dssdev);
+        dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
+
+        mutex_unlock(&ld->lock);
+        return 0;
+}
+
+static int lb035q02_panel_resume(struct omap_dss_device *dssdev)
+{
+        struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
+        int r;
+
+        mutex_lock(&ld->lock);
+
+        r = lb035q02_panel_power_on(dssdev);
+        if (r)
+                goto err;
+        dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+
+        mutex_unlock(&ld->lock);
+        return 0;
+err:
+        mutex_unlock(&ld->lock);
+        return r;
+}
+
+static struct omap_dss_driver lb035q02_driver = {
+        .probe          = lb035q02_panel_probe,
+        .remove         = lb035q02_panel_remove,
+
+        .enable         = lb035q02_panel_enable,
+        .disable        = lb035q02_panel_disable,
+        .suspend        = lb035q02_panel_suspend,
+        .resume         = lb035q02_panel_resume,
+
+        .driver         = {
+                .name   = "lgphilips_lb035q02_panel",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
+{
+        struct spi_message msg;
+        struct spi_transfer index_xfer = {
+                .len            = 3,
+                .cs_change      = 1,
+        };
+        struct spi_transfer value_xfer = {
+                .len            = 3,
+        };
+        u8      buffer[16];
+
+        spi_message_init(&msg);
+
+        /* register index */
+        buffer[0] = 0x70;
+        buffer[1] = 0x00;
+        buffer[2] = reg & 0x7f;
+        index_xfer.tx_buf = buffer;
+        spi_message_add_tail(&index_xfer, &msg);
+
+        /* register value */
+        buffer[4] = 0x72;
+        buffer[5] = val >> 8;
+        buffer[6] = val;
+        value_xfer.tx_buf = buffer + 4;
+        spi_message_add_tail(&value_xfer, &msg);
+
+        return spi_sync(spi, &msg);
+}
+
+static void init_lb035q02_panel(struct spi_device *spi)
+{
+        /* Init sequence from page 28 of the lb035q02 spec */
+        lb035q02_write_reg(spi, 0x01, 0x6300);
+        lb035q02_write_reg(spi, 0x02, 0x0200);
+        lb035q02_write_reg(spi, 0x03, 0x0177);
+        lb035q02_write_reg(spi, 0x04, 0x04c7);
+        lb035q02_write_reg(spi, 0x05, 0xffc0);
+        lb035q02_write_reg(spi, 0x06, 0xe806);
+        lb035q02_write_reg(spi, 0x0a, 0x4008);
+        lb035q02_write_reg(spi, 0x0b, 0x0000);
+        lb035q02_write_reg(spi, 0x0d, 0x0030);
+        lb035q02_write_reg(spi, 0x0e, 0x2800);
+        lb035q02_write_reg(spi, 0x0f, 0x0000);
+        lb035q02_write_reg(spi, 0x16, 0x9f80);
+        lb035q02_write_reg(spi, 0x17, 0x0a0f);
+        lb035q02_write_reg(spi, 0x1e, 0x00c1);
+        lb035q02_write_reg(spi, 0x30, 0x0300);
+        lb035q02_write_reg(spi, 0x31, 0x0007);
+        lb035q02_write_reg(spi, 0x32, 0x0000);
+        lb035q02_write_reg(spi, 0x33, 0x0000);
+        lb035q02_write_reg(spi, 0x34, 0x0707);
+        lb035q02_write_reg(spi, 0x35, 0x0004);
+        lb035q02_write_reg(spi, 0x36, 0x0302);
+        lb035q02_write_reg(spi, 0x37, 0x0202);
+        lb035q02_write_reg(spi, 0x3a, 0x0a0d);
+        lb035q02_write_reg(spi, 0x3b, 0x0806);
+}
+
+static int __devinit lb035q02_panel_spi_probe(struct spi_device *spi)
+{
+        init_lb035q02_panel(spi);
+        return omap_dss_register_driver(&lb035q02_driver);
+}
+
+static int __devexit lb035q02_panel_spi_remove(struct spi_device *spi)
+{
+        omap_dss_unregister_driver(&lb035q02_driver);
+        return 0;
+}
+
+static struct spi_driver lb035q02_spi_driver = {
+        .driver         = {
+                .name   = "lgphilips_lb035q02_panel-spi",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = lb035q02_panel_spi_probe,
+        .remove         = __devexit_p(lb035q02_panel_spi_remove),
+};
+
+static int __init lb035q02_panel_drv_init(void)
+{
+        return spi_register_driver(&lb035q02_spi_driver);
+}
+
+static void __exit lb035q02_panel_drv_exit(void)
+{
+        spi_unregister_driver(&lb035q02_spi_driver);
+}
+
+module_init(lb035q02_panel_drv_init);
+module_exit(lb035q02_panel_drv_exit);
+MODULE_LICENSE("GPL");