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

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

Original patch by Morten Larsen.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Andrew Victor 2007-05-02 17:58:51 +01:00 • committed by Russell King
parent 7776a94c31
commit 235227285b
1 changed files with 50 additions and 2 deletions
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52
arch/arm/mach-at91/board-sam9261ek.c
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@ -25,6 +25,7 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/spi/spi.h> #include <linux/spi/spi.h>
#include <linux/spi/ads7846.h>
#include <linux/dm9000.h> #include <linux/dm9000.h>
#include <asm/hardware.h> #include <asm/hardware.h>
@ -194,6 +195,41 @@ static struct at91_nand_data __initdata ek_nand_data = {
#endif #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 * SPI devices
*/ */
@ -204,6 +240,16 @@ static struct spi_board_info ek_spi_devices[] = {
.max_speed_hz = 15 * 1000 * 1000, .max_speed_hz = 15 * 1000 * 1000,
.bus_num = 0, .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) #if defined(CONFIG_MTD_AT91_DATAFLASH_CARD)
{ /* DataFlash card - jumper (J12) configurable to CS3 or CS0 */ { /* DataFlash card - jumper (J12) configurable to CS3 or CS0 */
.modalias = "mtd_dataflash", .modalias = "mtd_dataflash",
@ -211,9 +257,9 @@ static struct spi_board_info ek_spi_devices[] = {
.max_speed_hz = 15 * 1000 * 1000, .max_speed_hz = 15 * 1000 * 1000,
.bus_num = 0, .bus_num = 0,
}, },
#elif defined(CONFIG_SND_AT73C213) #elif defined(CONFIG_SND_AT73C213) || defined(CONFIG_SND_AT73C213_MODULE)
{ /* AT73C213 DAC */ { /* AT73C213 DAC */
.modalias = "snd_at73c213", .modalias = "at73c213",
.chip_select = 3, .chip_select = 3,
.max_speed_hz = 10 * 1000 * 1000, .max_speed_hz = 10 * 1000 * 1000,
.bus_num = 0, .bus_num = 0,
@ -241,6 +287,8 @@ static void __init ek_board_init(void)
#if defined(CONFIG_SPI_ATMEL) || defined(CONFIG_SPI_ATMEL_MODULE) #if defined(CONFIG_SPI_ATMEL) || defined(CONFIG_SPI_ATMEL_MODULE)
/* SPI */ /* SPI */
at91_add_device_spi(ek_spi_devices, ARRAY_SIZE(ek_spi_devices)); at91_add_device_spi(ek_spi_devices, ARRAY_SIZE(ek_spi_devices));
/* Touchscreen */
ek_add_device_ts();
#else #else
/* MMC */ /* MMC */
at91_add_device_mmc(0, &ek_mmc_data); at91_add_device_mmc(0, &ek_mmc_data);