[ARM] 4354/1: AT91: Support ADS7846 touchsceen on SAM9263-EK board
Add support for the ADS7846 Touchscreen found on the Atmel
AT91SAM9263-EK board.
Signed-off-by: Nicolas Ferre <nicolas.ferre@rfo.atmel.com>
Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-at91/board-sam9263ek.c b/arch/arm/mach-at91/board-sam9263ek.c
index 8fdce11..81d3d6a 100644
--- a/arch/arm/mach-at91/board-sam9263ek.c
+++ b/arch/arm/mach-at91/board-sam9263ek.c
@@ -25,6 +25,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
+#include <linux/spi/ads7846.h>
#include <asm/hardware.h>
#include <asm/setup.h>
@@ -86,6 +87,40 @@
/*
+ * ADS7846 Touchscreen
+ */
+#if defined(CONFIG_TOUCHSCREEN_ADS7846) || defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
+static int ads7843_pendown_state(void)
+{
+ return !at91_get_gpio_value(AT91_PIN_PA15); /* Touchscreen PENIRQ */
+}
+
+static struct ads7846_platform_data ads_info = {
+ .model = 7843,
+ .x_min = 150,
+ .x_max = 3830,
+ .y_min = 190,
+ .y_max = 3830,
+ .vref_delay_usecs = 100,
+ .x_plate_ohms = 450,
+ .y_plate_ohms = 250,
+ .pressure_max = 15000,
+ .debounce_max = 1,
+ .debounce_rep = 0,
+ .debounce_tol = (~0),
+ .get_pendown_state = ads7843_pendown_state,
+};
+
+static void __init ek_add_device_ts(void)
+{
+ at91_set_B_periph(AT91_PIN_PA15, 1); /* External IRQ1, with pullup */
+ at91_set_gpio_input(AT91_PIN_PA31, 1); /* Touchscreen BUSY signal */
+}
+#else
+static void __init ek_add_device_ts(void) {}
+#endif
+
+/*
* SPI devices.
*/
static struct spi_board_info ek_spi_devices[] = {
@@ -97,6 +132,16 @@
.bus_num = 0,
},
#endif
+#if defined(CONFIG_TOUCHSCREEN_ADS7846) || defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
+ {
+ .modalias = "ads7846",
+ .chip_select = 3,
+ .max_speed_hz = 125000 * 26, /* (max sample rate @ 3V) * (cmd + data + overhead) */
+ .bus_num = 0,
+ .platform_data = &ads_info,
+ .irq = AT91SAM9263_ID_IRQ1,
+ },
+#endif
};
@@ -157,7 +202,10 @@
/* USB Device */
at91_add_device_udc(&ek_udc_data);
/* SPI */
+ at91_set_gpio_output(AT91_PIN_PE20, 1); /* select spi0 clock */
at91_add_device_spi(ek_spi_devices, ARRAY_SIZE(ek_spi_devices));
+ /* Touchscreen */
+ ek_add_device_ts();
/* MMC */
at91_add_device_mmc(1, &ek_mmc_data);
/* NAND */