fix up old touch screen implementation

Change-Id: Ib7fe714a770f5295d43a1b40dca40b3abd8a4a16

1 files changed, 71 insertions, 1 deletions

diff --git a/arch/x86/platform/mrst/mrst.c b/arch/x86/platform/mrst/mrst.c
index f8c29a26bce..f891827c510 100644
--- a/arch/x86/platform/mrst/mrst.c
+++ b/arch/x86/platform/mrst/mrst.c
@@ -31,6 +31,7 @@
 #include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/notifier.h>
+#include <linux/atmel_mxt224.h>
 
 #include <asm/setup.h>
 #include <asm/mpspec_def.h>
@@ -565,6 +566,70 @@ static void __init *lis331dl_platform_data(void *info)
 	return &intr2nd_pdata;
 }
 
+static  int mxt_reset_gpio;
+
+static u8 mxt_valid_interrupt(void)
+{
+	return 1;
+}
+
+static void mxt_init_platform_hw(void)
+{
+	int err;
+
+	err = gpio_request(mxt_reset_gpio, "MaxTouch-reset");
+	if (err < 0)
+		printk(KERN_ERR "Failed to request GPIO%d (MaxTouch-reset) err=%d\n",
+			mxt_reset_gpio, err);
+
+	err = gpio_direction_output(mxt_reset_gpio, 0);
+	if (err)
+		printk(KERN_ERR "Failed to change direction, err=%d\n", err);
+
+	/* maXTouch wants 40mSec minimum after reset to get organized */
+	gpio_set_value(mxt_reset_gpio, 1);
+	msleep(40);
+}
+
+static void mxt_exit_platform_hw(void)
+{
+	printk(KERN_INFO "In %s.", __func__);
+	gpio_set_value(mxt_reset_gpio, 0);
+}
+
+static void *mxt_platform_data(void *info)
+{
+	struct i2c_board_info *i2c_info = (struct i2c_board_info *) info;
+	static struct mxt_platform_data mfld_mxt_platform_data;
+	int intr = 0;
+
+	printk(KERN_INFO "In %s.", __func__);
+
+	memset(&mfld_mxt_platform_data, 0x00,
+		sizeof(struct mxt_platform_data));
+	mfld_mxt_platform_data.numtouch         = 10;
+	mfld_mxt_platform_data.init_platform_hw = &mxt_init_platform_hw;
+	mfld_mxt_platform_data.exit_platform_hw = &mxt_exit_platform_hw;
+	mfld_mxt_platform_data.max_x            = 864;
+	mfld_mxt_platform_data.max_y            = 480;
+	mfld_mxt_platform_data.orientation      = MXT_MSGB_T9_ORIENT_HORZ_FLIP;
+	mfld_mxt_platform_data.valid_interrupt  = &mxt_valid_interrupt;
+
+	intr = get_gpio_by_name("TS0-intr");
+	if (intr == -1) {
+		printk(KERN_ERR "Missing GPIO(s) for MXT.\n");
+		return NULL;
+	}
+
+	/* On nCDK EB2.0, Atmel max touch reset is on
+	GP_CORE_033 = 33 + 96 = 129 */
+	mxt_reset_gpio = 129; /* TODO: Use SFI, when SFI is available */
+
+	i2c_info->irq = intr + MRST_IRQ_OFFSET;
+	return &mfld_mxt_platform_data;
+}
+
+
 /* MFLD iCDK touchscreen data */
 #define CYTTSP_GPIO_PIN 0x3E
 static int cyttsp_init(int on)
@@ -772,6 +837,7 @@ static const struct devs_id __initconst device_ids[] = {
 	{"i2c_accel", SFI_DEV_TYPE_I2C, 0, &lis331dl_platform_data},
 	{"pmic_audio", SFI_DEV_TYPE_IPC, 1, &no_platform_data},
 	{"mpu3050", SFI_DEV_TYPE_I2C, 1, &mpu3050_platform_data},
+	{"mXT224", SFI_DEV_TYPE_I2C, 1, &mxt_platform_data},
 	{"ektf2136_spi", SFI_DEV_TYPE_SPI, 0, &ektf2136_spi_platform_data},
 	{"msic_adc", SFI_DEV_TYPE_IPC, 1, &msic_adc_platform_data},
 
@@ -1042,6 +1108,10 @@ static int __init sfi_parse_devs(struct sfi_table_header *table)
 				i2c_info.type,
 				i2c_info.irq,
 				i2c_info.addr);
+			if (!strcmp(i2c_info.type, "mxt224")){
+				printk(KERN_INFO "[%s:%d] Breaking mxt224 driver\n",__func__,__LINE__);
+				break;
+			}
 			sfi_handle_i2c_dev(bus, &i2c_info);
 			break;
 		case SFI_DEV_TYPE_UART:
@@ -1242,4 +1312,4 @@ void mfld_hsu_disable_wakeup(int index, struct device *dev)
 		dev_err(dev, "hsu: unknow hsu port\n");
 	}
 }
-EXPORT_SYMBOL_GPL(mfld_hsu_disable_wakeup);
\ No newline at end of file
+