ARM: OMAP: Add bitbank SPI driver for Innovator 1510 touchscreen

Add bitbang SPI driver for Innovator 1510 touchscreen, using the new
framework.  Compile-tested only.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/arch/arm/mach-omap1/board-innovator.c b/arch/arm/mach-omap1/board-innovator.c
index 43260aa20f86..4cbc62db5b5d 100644
--- a/arch/arm/mach-omap1/board-innovator.c
+++ b/arch/arm/mach-omap1/board-innovator.c
@@ -177,6 +177,10 @@ static struct platform_device innovator_kp_device = {
 
 #ifdef CONFIG_ARCH_OMAP15XX
 
+#include <linux/spi/spi.h>
+#include <linux/spi/ads7846.h>
+
+
 /* Only FPGA needs to be mapped here. All others are done with ioremap */
 static struct map_desc innovator1510_io_desc[] __initdata = {
         {
@@ -212,14 +216,44 @@ static struct platform_device innovator1510_lcd_device = {
         .id             = -1,
 };
 
+static struct platform_device innovator1510_spi_device = {
+        .name           = "spi_inn1510",
+        .id             = -1,
+};
+
 static struct platform_device *innovator1510_devices[] __initdata = {
         &innovator_flash_device,
         &innovator1510_smc91x_device,
         &innovator_mcbsp1_device,
         &innovator_kp_device,
         &innovator1510_lcd_device,
+        &innovator1510_spi_device,
 };
 
+static int innovator_get_pendown_state(void)
+{
+        return !(fpga_read(OMAP1510_FPGA_TOUCHSCREEN) & (1 << 5));
+}
+
+static const struct ads7846_platform_data innovator1510_ts_info = {
+        .model                  = 7846,
+        .vref_delay_usecs       = 100,  /* internal, no capacitor */
+        .x_plate_ohms           = 419,
+        .y_plate_ohms           = 486,
+        .get_pendown_state      = innovator_get_pendown_state,
+};
+
+static struct spi_board_info __initdata innovator1510_boardinfo[] = { {
+        /* FPGA (bus "10") CS0 has an ads7846e */
+        .modalias               = "ads7846",
+        .platform_data          = &innovator1510_ts_info,
+        .irq                    = OMAP1510_INT_FPGA_TS,
+        .max_speed_hz           = 120000 /* max sample rate at 3V */
+                                        * 26 /* command + data + overhead */,
+        .bus_num                = 10,
+        .chip_select            = 0,
+} };
+
 #endif /* CONFIG_ARCH_OMAP15XX */
 
 #ifdef CONFIG_ARCH_OMAP16XX
@@ -350,6 +384,8 @@ static void __init innovator_init(void)
 #ifdef CONFIG_ARCH_OMAP15XX
         if (cpu_is_omap1510()) {
                 platform_add_devices(innovator1510_devices, ARRAY_SIZE(innovator1510_devices));
+                spi_register_board_info(innovator1510_boardinfo,
+                                ARRAY_SIZE(innovator1510_boardinfo));
         }
 #endif
 #ifdef CONFIG_ARCH_OMAP16XX