ENGR00137602-1 input: FSL MPR121 capacitive touch button.

This button driver is based on Freescale MPR121 capacitive
touch sensor controller.

It can support 12 elements maximal. The chip is use i2c interface.

You can find all the data sheet reference in code by google the name.

Signed-off-by: Zhang Jiejing <jiejing.zhang@freescale.com>

1 files changed, 79 insertions, 0 deletions

diff --git a/include/linux/i2c/mpr.h b/include/linux/i2c/mpr.h
new file mode 100644
index 000000000000..ded00db775f3
--- /dev/null
+++ b/include/linux/i2c/mpr.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+
+ * 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.
+ */
+
+/* mpr.h - Header file for Freescale MPR121 Capacitive Touch Sensor Controllor */
+
+#ifndef MPR_H
+#define MPR_H
+
+/* Register definitions */
+#define ELE_TOUCH_STATUS_0_ADDR	0x0
+#define ELE_TOUCH_STATUS_1_ADDR	0X1
+#define MHD_RISING_ADDR		0x2b
+#define NHD_RISING_ADDR		0x2c
+#define NCL_RISING_ADDR		0x2d
+#define FDL_RISING_ADDR		0x2e
+#define MHD_FALLING_ADDR	0x2f
+#define NHD_FALLING_ADDR	0x30
+#define NCL_FALLING_ADDR	0x31
+#define FDL_FALLING_ADDR	0x32
+#define ELE0_TOUCH_THRESHOLD_ADDR	0x41
+#define ELE0_RELEASE_THRESHOLD_ADDR	0x42
+/* ELE0...ELE11's threshold will set in a loop */
+#define AFE_CONF_ADDR			0x5c
+#define FILTER_CONF_ADDR		0x5d
+
+/* ELECTRODE_CONF: this register is most important register, it
+ * control how many of electrode is enabled. If you set this register
+ * to 0x0, it make the sensor going to suspend mode. Other value(low
+ * bit is non-zero) will make the sensor into Run mode.  This register
+ * should be write at last.
+ */
+#define ELECTRODE_CONF_ADDR		0x5e
+#define AUTO_CONFIG_CTRL_ADDR		0x7b
+/* AUTO_CONFIG_USL: Upper Limit for auto baseline search, this
+ * register is related to VDD supplied on your board, the value of
+ * this register is calc by EQ: `((VDD-0.7)/VDD) * 256`.
+ * AUTO_CONFIG_LSL: Low Limit of auto baseline search. This is 65% of
+ * USL AUTO_CONFIG_TL: The Traget Level of auto baseline search, This
+ * is 90% of USL  */
+#define AUTO_CONFIG_USL_ADDR		0x7d
+#define AUTO_CONFIG_LSL_ADDR		0x7e
+#define AUTO_CONFIG_TL_ADDR		0x7f
+
+/* Threshold of touch/release trigger */
+#define TOUCH_THRESHOLD			0x0f
+#define RELEASE_THRESHOLD		0x0a
+/* Mask Button bits of STATUS_0 & STATUS_1 register */
+#define TOUCH_STATUS_MASK		0xfff
+/* MPR121 have 12 electrodes */
+#define MPR121_MAX_KEY_COUNT		12
+
+
+/**
+ * @keycount: how many key maped
+ * @vdd_uv: voltage of vdd supply the chip in uV
+ * @matrix: maxtrix of keys
+ * @wakeup: can key wake up system.
+ */
+struct mpr121_platform_data {
+	u16 keycount;
+	u16 *matrix;
+	int wakeup;
+	int vdd_uv;
+};
+
+#endif