An upcoming Overo expansion board includes an ADS7846 touchscreen controller.
This patch adds support via the ads7846 driver when enabled in the kernel config. Signed-off-by: Steve Sakoman <[email protected]> --- arch/arm/mach-omap2/board-overo.c | 61 +++++++++++++++++++++++++ arch/arm/plat-omap/include/mach/board-overo.h | 1 + 2 files changed, 62 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-omap2/board-overo.c b/arch/arm/mach-omap2/board-overo.c index 032a2c9..2521b21 100644 --- a/arch/arm/mach-omap2/board-overo.c +++ b/arch/arm/mach-omap2/board-overo.c @@ -116,6 +116,66 @@ static inline void __init overo_init_smsc911x(void) static inline void __init overo_init_smsc911x(void) { return; } #endif +#if defined(CONFIG_TOUCHSCREEN_ADS7846) || \ + defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE) + +#include <mach/mcspi.h> +#include <linux/spi/spi.h> +#include <linux/spi/ads7846.h> + +static struct omap2_mcspi_device_config ads7846_mcspi_config = { + .turbo_mode = 0, + .single_channel = 1, /* 0: slave, 1: master */ +}; + + +static int ads7846_get_pendown_state(void) +{ + return !gpio_get_value(OVERO_GPIO_PENDOWN); +} + +static struct ads7846_platform_data ads7846_config = { + .x_max = 0x0fff, + .y_max = 0x0fff, + .x_plate_ohms = 180, + .pressure_max = 255, + .debounce_max = 10, + .debounce_tol = 3, + .debounce_rep = 1, + .get_pendown_state = ads7846_get_pendown_state, + .keep_vref_on = 1, +}; + +static struct spi_board_info overo_spi_board_info[] __initdata = { + { + .modalias = "ads7846", + .bus_num = 1, + .chip_select = 0, + .max_speed_hz = 1500000, + .controller_data = &ads7846_mcspi_config, + .irq = OMAP_GPIO_IRQ(OVERO_GPIO_PENDOWN), + .platform_data = &ads7846_config, + } +}; + +static void __init overo_ads7846_init(void) +{ + if ((gpio_request(OVERO_GPIO_PENDOWN, "ADS7846_PENDOWN") == 0) && + (gpio_direction_input(OVERO_GPIO_PENDOWN) == 0)) { + gpio_export(OVERO_GPIO_PENDOWN, 0); + } else { + printk(KERN_ERR "could not obtain gpio for ADS7846_PENDOWN\n"); + return; + } + + spi_register_board_info(overo_spi_board_info, + ARRAY_SIZE(overo_spi_board_info)); +} + +#else +static inline void __init overo_ads7846_init(void) { return; } +#endif + static struct mtd_partition overo_nand_partitions[] = { { .name = "xloader", @@ -296,6 +356,7 @@ static void __init overo_init(void) usb_ehci_init(); overo_flash_init(); overo_init_smsc911x(); + overo_ads7846_init(); if ((gpio_request(OVERO_GPIO_W2W_NRESET, "OVERO_GPIO_W2W_NRESET") == 0) && diff --git a/arch/arm/plat-omap/include/mach/board-overo.h b/arch/arm/plat-omap/include/mach/board-overo.h index 8635171..aca717d 100644 --- a/arch/arm/plat-omap/include/mach/board-overo.h +++ b/arch/arm/plat-omap/include/mach/board-overo.h @@ -18,6 +18,7 @@ #define OVERO_GPIO_BT_XGATE 15 #define OVERO_GPIO_W2W_NRESET 16 +#define OVERO_GPIO_PENDOWN 114 #define OVERO_GPIO_BT_NRESET 164 #define OVERO_GPIO_USBH_CPEN 168 #define OVERO_GPIO_USBH_NRESET 183 -- 1.5.6.3 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
