OMAP2EVM : Add touchscreen support

Adding ads7846 touchscreen support to omap2evm board

Signed-off-by: Arun KS <arunks@mistralsolutions.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap2/board-omap2evm.c b/arch/arm/mach-omap2/board-omap2evm.c
index 9f19c34..d284551 100644 (file)
--- a/arch/arm/mach-omap2/board-omap2evm.c
+++ b/arch/arm/mach-omap2/board-omap2evm.c
@@ -22,6 +22,8 @@
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/partitions.h>
 #include <linux/mtd/nand.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/ads7846.h>
 
 #include <mach/hardware.h>
 #include <asm/mach-types.h>
@@ -36,6 +38,8 @@
 #include <mach/keypad.h>
 #include <mach/gpmc.h>
 #include <mach/nand.h>
+#include <mach/mcspi.h>
+#include <mach/mux.h>
 
 #define GPMC_OFF_CONFIG1_0 0x60
 
@@ -181,6 +185,66 @@ static struct omap_lcd_config omap2_evm_lcd_config __initdata = {
        .ctrl_name      = "internal",
 };
 
+static void ads7846_dev_init(void)
+{
+       int gpio = OMAP2_EVM_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);
+
+       /*Setting the MUX */
+       omap_cfg_reg(Y18_2430_MCSPI1_CLK);
+       omap_cfg_reg(AD15_2430_MCSPI1_SIMO);
+       omap_cfg_reg(AE17_2430_MCSPI1_SOMI);
+       omap_cfg_reg(U1_2430_MCSPI1_CS0);
+
+       omap_cfg_reg(AF19_2430_GPIO_85);
+
+}
+
+static int ads7846_get_pendown_state(void)
+{
+       return !omap_get_gpio_datain(OMAP2_EVM_TS_GPIO);
+}
+
+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,
+       .settle_delay_usecs     = 150,
+};
+
+static struct omap2_mcspi_device_config ads7846_mcspi_config = {
+       .turbo_mode     = 0,
+       .single_channel = 1,  /* 0: slave, 1: master */
+};
+
+struct spi_board_info omap2evm_spi_board_info[] = {
+       [0] = {
+               .modalias               = "ads7846",
+               .bus_num                = 1,
+               .chip_select            = 0,
+               .max_speed_hz           = 1500000,
+               .controller_data        = &ads7846_mcspi_config,
+               .irq                    = OMAP_GPIO_IRQ(OMAP2_EVM_TS_GPIO),
+               .platform_data          = &ads7846_config,
+       },
+};
+
+
 static int omap2evm_keymap[] = {
        KEY(0, 0, KEY_LEFT),
        KEY(0, 1, KEY_RIGHT),
@@ -280,9 +344,12 @@ static void __init omap2_evm_init(void)
        platform_add_devices(omap2_evm_devices, ARRAY_SIZE(omap2_evm_devices));
        omap_board_config = omap2_evm_config;
        omap_board_config_size = ARRAY_SIZE(omap2_evm_config);
+       spi_register_board_info(omap2evm_spi_board_info,
+                               ARRAY_SIZE(omap2evm_spi_board_info));
        omap_serial_init();
        hsmmc_init();
        omap2evm_flash_init();
+       ads7846_dev_init();
 }
 
 static void __init omap2_evm_map_io(void)

diff --git a/arch/arm/plat-omap/include/mach/board-omap2evm.h b/arch/arm/plat-omap/include/mach/board-omap2evm.h
index ec548d4..c6ba428 100644 (file)
--- a/arch/arm/plat-omap/include/mach/board-omap2evm.h
+++ b/arch/arm/plat-omap/include/mach/board-omap2evm.h
@@ -30,8 +30,9 @@
 #define __ASM_ARCH_OMAP2_EVM_H
 
 /* Placeholder for OMAP2EVM specific defines */
-#define OMAP2EVM_ETHR_START                    0x2c000000
-#define OMAP2EVM_ETHR_SIZE                     1024
+#define OMAP2EVM_ETHR_START            0x2c000000
+#define OMAP2EVM_ETHR_SIZE             1024
 #define OMAP2EVM_ETHR_GPIO_IRQ         149
+#define        OMAP2_EVM_TS_GPIO               85
 
 #endif /* __ASM_ARCH_OMAP2_EVM_H */