From: Sanggun Lee<[email protected]>
This is a TSP driver for touchscreen chip mms144 of MELFAS.
It uses soft I2C interface and supports single touch.
This driver uses polling method.
If there are touch events, mms144_interrupt() reads and returns 0.
If not, mms144_interrupt() returns -1.
Signed-off-by: SangGun Lee<[email protected]>
Signed-off-by: Joonyoung Shim<[email protected]>
Signed-off=by: MyungJoo Ham<[email protected]>
---
drivers/input/Makefile | 1 +
drivers/input/mms144.c | 202 ++++++++++++++++++++++++++++++++++++++++++++++++
include/mms144.h | 41 ++++++++++
3 files changed, 244 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/mms144.c
create mode 100644 include/mms144.h
diff --git a/drivers/input/Makefile b/drivers/input/Makefile
index 0805e86..c802188 100644
--- a/drivers/input/Makefile
+++ b/drivers/input/Makefile
@@ -33,6 +33,7 @@ COBJS-$(CONFIG_PS2MULT) += ps2mult.o ps2ser.o
endif
COBJS-y += input.o
COBJS-$(CONFIG_OF_CONTROL) += key_matrix.o
+COBJS-$(CONFIG_MMS144) += mms144.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
diff --git a/drivers/input/mms144.c b/drivers/input/mms144.c
new file mode 100644
index 0000000..7532131
--- /dev/null
+++ b/drivers/input/mms144.c
@@ -0,0 +1,202 @@
+/*
+ * (C) Copyright 2012 Samsung Electronics
+ * Sang-gun Lee<[email protected]>
+ *
+ * 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.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <common.h>
+#include <mms144.h>
+#include <i2c.h>
+
+/* Operating Mode */
+#define mms144_SLEEP 0x01
+#define mms144_ACTIVE 0x02
+#define mms144_SW_RESET 0x03
+
+/* Write only registers */
+#define mms144_MODE_CONTROL 0x01
+
+/* Read only registers */
+#define mms144_PACKET_SIZE 0x0F
+#define mms144_INFOMATION 0x10
+
+/* Minimum delay time is 50us between stop and start signal of i2c */
+#define mms144_I2C_DELAY 50
+
+/* 200ms needs after power on */
+#define mms144_POWERON_DELAY 200
+
+/* Touchscreen absolute values */
+#define mms144_MAX_TOUCH 10
+
+/* XY calculate */
+#define X_SHIFT 8
+#define Y_SHIFT 4
+#define XY_HI_MASK 0xF00
+#define XY_LOW_MASK 0xFF
+#define X_LOW_MASK 0x0F
+#define Y_LOW_MASK 0xF0
+
+/* Others */
+#define SETUP_REG_LEN 6
+#define POWER_ON 1
+#define POWER_OFF 0
+
+struct mms144_touch {
+ unsigned char info;
+ unsigned char xy_hi;
+ unsigned char x_lo;
+ unsigned char y_lo;
+} __packed;
+
+static struct mms144_platform *pdata;
+
+static int
+mms144_read_reg(unsigned int addr, unsigned char *val, unsigned int len)
+{
+ int error;
+
+ i2c_set_bus_num(pdata->bus_num);
+
+ error = i2c_read(pdata->chip, addr, 1, val, len);
+ if (error != 0) {
+ printf("mms144_read_reg is failed\n");
+ return error;
+ }
+ udelay(mms144_I2C_DELAY);
+
+ return 0;
+}
+
+static int
+mms144_write_reg(unsigned int addr, unsigned char *val, unsigned int len)
+{
+ int error;
+
+ i2c_set_bus_num(pdata->bus_num);
+
+ error = i2c_write(pdata->chip, addr, 1, val, len);
+ if (error != 0) {
+ printf("mms144_write_reg is failed\n");
+ return error;
+ }
+ udelay(mms144_I2C_DELAY);
+
+ return 0;
+}
+
+static int mms144_setup_reg(void)
+{
+ unsigned char setup_reg_buf[SETUP_REG_LEN];
+ int error;
+
+ /*
+ * 0 = Mode Control
+ * 1 = XY hi resolution
+ * 2 = X low resolution
+ * 3 = Y low resolution
+ * 4 = Contact on event Threshold
+ * 5 = Moving event Threshold
+ */
+ setup_reg_buf[0] = mms144_ACTIVE;
+ setup_reg_buf[1] = ((pdata->y_size >> Y_SHIFT) & Y_LOW_MASK) |
+ ((pdata->x_size >> X_SHIFT) & X_LOW_MASK);
+ setup_reg_buf[2] = pdata->x_size & XY_LOW_MASK;
+ setup_reg_buf[3] = pdata->y_size & XY_LOW_MASK;
+ setup_reg_buf[4] = pdata->contact_threshold;
+ setup_reg_buf[5] = pdata->moving_threshold;
+
+ /* burst write */
+ error = mms144_write_reg(mms144_MODE_CONTROL,
+ setup_reg_buf, SETUP_REG_LEN);
+ if (error != 0) {
+ printf("mms144_setup_reg is failed\n");
+ return error;
+ }
+
+ return 0;
+}
+
+int mms144_start(struct mms144_platform *platform_data)
+{
+ int error;
+
+ pdata = platform_data;
+
+ /* TSP POWER ON */
+ pdata->cfg_power_pin(POWER_ON);
+ mdelay(mms144_POWERON_DELAY);
+
+ /* setup register. burst write from 0x01 */
+ error = mms144_setup_reg();
+ if (error != 0) {
+ printf("mms144_start is failed\n");
+ return error;
+ }
+
+ return 0;
+}
+
+void mms144_stop(void)
+{
+ /* TSP POWER disable */
+ pdata->cfg_power_pin(POWER_OFF);
+}
+
+static void
+mms144_calcul_xy(struct mms144_touch *touch, struct mms144_coord *coord)
+{
+ int x, y;
+
+ x = touch->xy_hi;
+ x = (x << X_SHIFT) & XY_HI_MASK;
+ x = x | (touch->x_lo & XY_LOW_MASK);
+
+ y = touch->xy_hi;
+ y = (y << Y_SHIFT) & XY_HI_MASK;
+ y = y | (touch->y_lo & XY_LOW_MASK);
+
+ coord->x = x;
+ coord->y = y;
+}
+
+int mms144_interrupt(struct mms144_coord *coord)
+{
+ int error;
+ unsigned char packet_size;
+ struct mms144_touch touch[mms144_MAX_TOUCH];
+
+ error = mms144_read_reg(mms144_PACKET_SIZE, &packet_size, 1);
+ if (error != 0) {
+ printf("\nmms144_interrupt is failed\n");
+ return -1;
+ }
+
+ if (packet_size == 0)
+ return -1;
+
+ error = mms144_read_reg(mms144_INFOMATION, touch, packet_size);
+ if (error != 0) {
+ printf("\nmms144_interrupt is failed\n");
+ return -1;
+ }
+
+ mms144_calcul_xy(touch, coord);
+
+ return 0;
+}
diff --git a/include/mms144.h b/include/mms144.h
new file mode 100644
index 0000000..a7a8d07
--- /dev/null
+++ b/include/mms144.h
@@ -0,0 +1,41 @@
+/*
+ * (C) Copyright 2012 Samsung Electronics
+ * Sang-gun Lee<[email protected]>
+ *
+ * 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.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#ifdef CONFIG_mms144
+struct mms144_platform {
+ unsigned char chip;
+ unsigned int bus_num;
+ unsigned int x_size;
+ unsigned int y_size;
+ unsigned int contact_threshold;
+ unsigned int moving_threshold;
+ void (*cfg_power_pin)(int enable);
+};
+
+struct mms144_coord {
+ unsigned int x;
+ unsigned int y;
+};
+
+int mms144_start(struct mms144_platform *pdata);
+void mms144_stop(void);
+int mms144_interrupt(struct mms144_coord *coord);
+#endif
-- 1.7.4.1
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