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authorMike Rapoport <mike@compulab.co.il>2011-04-25 01:09:05 +0300
committerTony Lindgren <tony@atomide.com>2011-05-03 02:38:09 -0700
commit96974a249b0cf3537f49115a59be67e2c54f315c (patch)
tree4415a81a5ad4a91313bacf6b534b77f5556858a9 /arch/arm/mach-omap2/common-board-devices.c
parentd14f81741f4ca5c96f52eff0210c8da0b0997d6f (diff)
downloadop-kernel-dev-96974a249b0cf3537f49115a59be67e2c54f315c.zip
op-kernel-dev-96974a249b0cf3537f49115a59be67e2c54f315c.tar.gz
omap: consolidate touch screen initialization among different boards
Add common-board-devices.c that will contain the code for peripheral devices initializatoin shared between multiple boards. Start small with touchscreen initialization. Signed-off-by: Mike Rapoport <mike@compulab.co.il> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/mach-omap2/common-board-devices.c')
-rw-r--r--arch/arm/mach-omap2/common-board-devices.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/common-board-devices.c b/arch/arm/mach-omap2/common-board-devices.c
new file mode 100644
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--- /dev/null
+++ b/arch/arm/mach-omap2/common-board-devices.c
@@ -0,0 +1,85 @@
+/*
+ * common-board-devices.c
+ *
+ * Copyright (C) 2011 CompuLab, Ltd.
+ * Author: Mike Rapoport <mike@compulab.co.il>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/gpio.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/ads7846.h>
+
+#include <plat/mcspi.h>
+
+#include "common-board-devices.h"
+
+static struct omap2_mcspi_device_config ads7846_mcspi_config = {
+ .turbo_mode = 0,
+ .single_channel = 1, /* 0: slave, 1: master */
+};
+
+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,
+ .gpio_pendown = -EINVAL,
+ .keep_vref_on = 1,
+};
+
+static struct spi_board_info ads7846_spi_board_info __initdata = {
+ .modalias = "ads7846",
+ .bus_num = -EINVAL,
+ .chip_select = 0,
+ .max_speed_hz = 1500000,
+ .controller_data = &ads7846_mcspi_config,
+ .irq = -EINVAL,
+ .platform_data = &ads7846_config,
+};
+
+void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
+ struct ads7846_platform_data *board_pdata)
+{
+ struct spi_board_info *spi_bi = &ads7846_spi_board_info;
+ int err;
+
+ err = gpio_request(gpio_pendown, "TS PenDown");
+ if (err) {
+ pr_err("Could not obtain gpio for TS PenDown: %d\n", err);
+ return;
+ }
+
+ gpio_direction_input(gpio_pendown);
+ gpio_export(gpio_pendown, 0);
+
+ if (gpio_debounce)
+ gpio_set_debounce(gpio_pendown, gpio_debounce);
+
+ ads7846_config.gpio_pendown = gpio_pendown;
+
+ spi_bi->bus_num = bus_num;
+ spi_bi->irq = OMAP_GPIO_IRQ(gpio_pendown);
+
+ if (board_pdata)
+ spi_bi->platform_data = board_pdata;
+
+ spi_register_board_info(&ads7846_spi_board_info, 1);
+}
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