Adding ads7846 touchscreen support to omap2evm board
Signed-off-by: Arun KS <arunks@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-omap2/board-omap2evm.c | 67 ++++++++++++++++++++++
arch/arm/plat-omap/include/mach/board-omap2evm.h | 5 +-
2 files changed, 70 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-omap2/board-omap2evm.c
b/arch/arm/mach-omap2/board-omap2evm.c
index 6ce7740..5bbf36f 100644
--- 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),
@@ -269,9 +333,12 @@ 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
--- 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 */
--
1.5.3.4
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