From: Steve Sakoman <steve@xxxxxxxxxxx>
Add touchscreen support for OMAP3 EVM
Signed-off-by: Steve Sakoman <steve@xxxxxxxxxxx>
---
arch/arm/mach-omap2/board-omap3evm.c | 42 +++++++++++++++++++++++++++++
include/asm-arm/arch-omap/board-omap3evm.h | 1
2 files changed, 43 insertions(+)
diff -uprN -X a/Documentation/dontdiff
a/arch/arm/mach-omap2/board-omap3evm.c
b/arch/arm/mach-omap2/board-omap3evm.c
--- a/arch/arm/mach-omap2/board-omap3evm.c 2008-04-28 21:03:22.000000000 -0700
+++ b/arch/arm/mach-omap2/board-omap3evm.c 2008-04-28 21:16:35.000000000 -0700
@@ -19,6 +19,8 @@
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/ads7846.h>
#include <asm/hardware.h>
#include <asm/mach-types.h>
@@ -31,6 +33,7 @@
#include <asm/arch/usb-musb.h>
#include <asm/arch/usb-ehci.h>
#include <asm/arch/common.h>
+#include <asm/arch/mcspi.h>
static struct omap_uart_config omap3_evm_uart_config __initdata = {
.enabled_uarts = ((1 << 0) | (1 << 1) | (1 << 2)),
@@ -65,6 +68,44 @@
.id = -1,
};
+static void ads7846_dev_init(void)
+{
+ if (omap_request_gpio(OMAP3_EVM_TS_GPIO) < 0)
+ printk(KERN_ERR "can't get ads7846 pen down GPIO\n");
+
+ omap_set_gpio_direction(OMAP3_EVM_TS_GPIO, 1);
+
+ omap_set_gpio_debounce(OMAP3_EVM_TS_GPIO, 1);
+ omap_set_gpio_debounce_time(OMAP3_EVM_TS_GPIO, 0xa);
+}
+
+static int ads7846_get_pendown_state(void)
+{
+ return !omap_get_gpio_datain(OMAP3_EVM_TS_GPIO);
+}
+
+struct ads7846_platform_data ads7846_config = {
+ .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 */
+};
+
+struct spi_board_info omap3evm_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(OMAP3_EVM_TS_GPIO),
+ .platform_data = &ads7846_config,
+ },
+};
+
static void __init omap3_evm_init_irq(void)
{
omap2_init_common_hw();
@@ -90,6 +90,10 @@ static void __init omap3_evm_init(void)
platform_add_devices(omap3_evm_devices, ARRAY_SIZE(omap3_evm_devices));
omap_board_config = omap3_evm_config;
omap_board_config_size = ARRAY_SIZE(omap3_evm_config);
+
+ spi_register_board_info(omap3evm_spi_board_info,
+ ARRAY_SIZE(omap3evm_spi_board_info));
+
omap_serial_init();
hsmmc_init();
usb_musb_init();
@@ -95,6 +136,7 @@
usb_musb_init();
usb_ehci_init();
omap3evm_flash_init();
+ ads7846_dev_init();
}
arch_initcall(omap3_evm_i2c_init);
diff -uprN -X a/Documentation/dontdiff
a/include/asm-arm/arch-omap/board-omap3evm.h
b/include/asm-arm/arch-omap/board-omap3evm.h
--- a/include/asm-arm/arch-omap/board-omap3evm.h 2008-04-28
21:03:19.000000000 -0700
+++ b/include/asm-arm/arch-omap/board-omap3evm.h 2008-04-28
21:11:29.000000000 -0700
@@ -31,6 +31,7 @@
extern void omap3evm_flash_init(void);
+#define OMAP3_EVM_TS_GPIO 175
#define ONENAND_MAP 0x20000000
#endif /* __ASM_ARCH_OMAP3_EVM_H */
--
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