Add touchscreen support for Pandora

This patch adds ADS7846 compatible touchscreen support for
OMAP3 Pandora.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap2/board-omap3pandora.c b/arch/arm/mach-omap2/board-omap3pandora.c
index 8a6c75fea78ceb8e9940295510cdb544cf294d72..6a29ed6d8b8bf5bc106f118aece4ed18954e5b43 100644 (file)
--- a/arch/arm/mach-omap2/board-omap3pandora.c
+++ b/arch/arm/mach-omap2/board-omap3pandora.c
@@ -25,6 +25,8 @@
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 
+#include <linux/spi/spi.h>
+#include <linux/spi/ads7846.h>
 #include <linux/i2c/twl4030.h>
 
 #include <linux/mtd/mtd.h>
@@ -45,6 +47,7 @@
 #include <mach/nand.h>
 #include <mach/usb-ehci.h>
 #include <mach/usb-musb.h>
+#include <mach/mcspi.h>
 
 #include "sdram-micron-mt46h32m32lf-6.h"
 #include "mmc-twl4030.h"
@@ -54,6 +57,8 @@
 #define GPMC_CS0_BASE  0x60
 #define GPMC_CS_SIZE   0x30
 
+#define OMAP3_PANDORA_TS_GPIO          94
+
 static struct mtd_partition omap3pandora_nand_partitions[] = {
        {
                .name           = "xloader",
@@ -185,6 +190,55 @@ static void __init omap3pandora_init_irq(void)
        omap_gpio_init();
 }
 
+static void __init omap3pandora_ads7846_init(void)
+{
+       int gpio = OMAP3_PANDORA_TS_GPIO;
+       int ret;
+
+       ret = gpio_request(gpio, "ads7846_pen_down");
+       if (ret < 0) {
+               printk(KERN_ERR "Failed to request GPIO %d for "
+                               "ads7846 pen down IRQ\n", gpio);
+               return;
+       }
+
+       gpio_direction_input(gpio);
+}
+
+static int ads7846_get_pendown_state(void)
+{
+       return !gpio_get_value(OMAP3_PANDORA_TS_GPIO);
+}
+
+static struct ads7846_platform_data ads7846_config = {
+       .x_max                  = 0x0fff,
+       .y_max                  = 0x0fff,
+       .x_plate_ohms           = 180,
+       .pressure_max           = 255,
+       .debounce_max           = 10,
+       .debounce_tol           = 3,
+       .debounce_rep           = 1,
+       .get_pendown_state      = ads7846_get_pendown_state,
+       .keep_vref_on           = 1,
+};
+
+static struct omap2_mcspi_device_config ads7846_mcspi_config = {
+       .turbo_mode     = 0,
+       .single_channel = 1,  /* 0: slave, 1: master */
+};
+
+static struct spi_board_info omap3pandora_spi_board_info[] __initdata = {
+       {
+               .modalias               = "ads7846",
+               .bus_num                = 1,
+               .chip_select            = 0,
+               .max_speed_hz           = 1500000,
+               .controller_data        = &ads7846_mcspi_config,
+               .irq                    = OMAP_GPIO_IRQ(OMAP3_PANDORA_TS_GPIO),
+               .platform_data          = &ads7846_config,
+       }
+};
+
 static struct platform_device omap3pandora_lcd_device = {
        .name           = "pandora_lcd",
        .id             = -1,
@@ -220,10 +274,13 @@ static void __init omap3pandora_init(void)
        omap_board_config = omap3pandora_config;
        omap_board_config_size = ARRAY_SIZE(omap3pandora_config);
        omap_serial_init();
+       spi_register_board_info(omap3pandora_spi_board_info,
+                       ARRAY_SIZE(omap3pandora_spi_board_info));
        hsmmc_init(mmc);
        usb_musb_init();
        usb_ehci_init();
        omap3pandora_flash_init();
+       omap3pandora_ads7846_init();
 }
 
 static void __init omap3pandora_map_io(void)