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Commit 7c73628f authored by Andrew Victor's avatar Andrew Victor Committed by Russell King
Browse files

[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: default avatarNicolas Ferre <nicolas.ferre@rfo.atmel.com>
Signed-off-by: default avatarAndrew Victor <andrew@sanpeople.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 23522728

arch/arm/mach-at91/board-sam9263ek.c

+48 −0
Original line number Original line Diff line number Diff line
@@ -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 <asm/hardware.h>

#include <asm/hardware.h>

#include <asm/setup.h>

#include <asm/setup.h>
@@ -85,6 +86,40 @@ static struct at91_udc_data __initdata ek_udc_data = { 
};

};









/*

 * 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.

 * SPI devices.

 */

 */
@@ -97,6 +132,16 @@ static struct spi_board_info ek_spi_devices[] = { 
		.bus_num	= 0,

		.bus_num	= 0,

	},

	},

#endif

#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 @@ static void __init ek_board_init(void) 
	/* USB Device */

	/* USB Device */

	at91_add_device_udc(&ek_udc_data);

	at91_add_device_udc(&ek_udc_data);

	/* SPI */

	/* SPI */

	at91_set_gpio_output(AT91_PIN_PE20, 1);		/* select spi0 clock */

	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();

	/* MMC */

	/* MMC */

	at91_add_device_mmc(1, &ek_mmc_data);

	at91_add_device_mmc(1, &ek_mmc_data);

	/* NAND */

	/* NAND */