Commit 23522728 authored by Andrew Victor's avatar Andrew Victor Committed by Russell King

[ARM] 4353/1: AT91: Support ADS7846 touchsceen on SAM9261-EK board

Add support for the ADS7846 Touchscreen found on the Atmel
AT91SAM9261-EK board.

Original patch by Morten Larsen.
Signed-off-by: default avatarAndrew Victor <andrew@sanpeople.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 7776a94c
......@@ -25,6 +25,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <linux/spi/ads7846.h>
#include <linux/dm9000.h>
#include <asm/hardware.h>
......@@ -194,6 +195,41 @@ static struct at91_nand_data __initdata ek_nand_data = {
#endif
};
/*
* 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_PC2); /* 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_PC2, 1); /* External IRQ0, with pullup */
at91_set_gpio_input(AT91_PIN_PA11, 1); /* Touchscreen BUSY signal */
}
#else
static void __init ek_add_device_ts(void) {}
#endif
/*
* SPI devices
*/
......@@ -204,6 +240,16 @@ static struct spi_board_info ek_spi_devices[] = {
.max_speed_hz = 15 * 1000 * 1000,
.bus_num = 0,
},
#if defined(CONFIG_TOUCHSCREEN_ADS7846) || defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
{
.modalias = "ads7846",
.chip_select = 2,
.max_speed_hz = 125000 * 26, /* (max sample rate @ 3V) * (cmd + data + overhead) */
.bus_num = 0,
.platform_data = &ads_info,
.irq = AT91SAM9261_ID_IRQ0,
},
#endif
#if defined(CONFIG_MTD_AT91_DATAFLASH_CARD)
{ /* DataFlash card - jumper (J12) configurable to CS3 or CS0 */
.modalias = "mtd_dataflash",
......@@ -211,9 +257,9 @@ static struct spi_board_info ek_spi_devices[] = {
.max_speed_hz = 15 * 1000 * 1000,
.bus_num = 0,
},
#elif defined(CONFIG_SND_AT73C213)
#elif defined(CONFIG_SND_AT73C213) || defined(CONFIG_SND_AT73C213_MODULE)
{ /* AT73C213 DAC */
.modalias = "snd_at73c213",
.modalias = "at73c213",
.chip_select = 3,
.max_speed_hz = 10 * 1000 * 1000,
.bus_num = 0,
......@@ -241,6 +287,8 @@ static void __init ek_board_init(void)
#if defined(CONFIG_SPI_ATMEL) || defined(CONFIG_SPI_ATMEL_MODULE)
/* SPI */
at91_add_device_spi(ek_spi_devices, ARRAY_SIZE(ek_spi_devices));
/* Touchscreen */
ek_add_device_ts();
#else
/* MMC */
at91_add_device_mmc(0, &ek_mmc_data);
......
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