Hi, This patch is to add support for SiS i2c touch panel.
Thanks a lot.
Signed-off-by: Ko-Hao, Yu <yuger_yu@xxxxxxx>
---
drivers/input/touchscreen/Kconfig | 11 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/sis_i2c.c | 525 ++++++++++++++++++++++++++++++++++++
3 files changed, 537 insertions(+)
create mode 100644 drivers/input/touchscreen/sis_i2c.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 600dcce..5782dd5 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -1064,4 +1064,15 @@ config TOUCHSCREEN_COLIBRI_VF50
To compile this driver as a module, choose M here: the
module will be called colibri_vf50_ts.
+config TOUCHSCREEN_SIS_I2C
+ tristate "SiS 9200 family I2C touchscreen driver"
+ depends on I2C && CRC_ITU_T
+ help
+ Say Y here to enable support for I2C connected SiS touch panels.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called sis_i2c.
+
endif
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 1b79cc0..360b577 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -87,3 +87,4 @@ obj-$(CONFIG_TOUCHSCREEN_SX8654) += sx8654.o
obj-$(CONFIG_TOUCHSCREEN_TPS6507X) += tps6507x-ts.o
obj-$(CONFIG_TOUCHSCREEN_ZFORCE) += zforce_ts.o
obj-$(CONFIG_TOUCHSCREEN_COLIBRI_VF50) += colibri-vf50-ts.o
+obj-$(CONFIG_TOUCHSCREEN_SIS_I2C) += sis_i2c.o
diff --git a/drivers/input/touchscreen/sis_i2c.c b/drivers/input/touchscreen/sis_i2c.c
new file mode 100644
index 0000000..f7b6ac5
--- /dev/null
+++ b/drivers/input/touchscreen/sis_i2c.c
@@ -0,0 +1,525 @@
+/*
+ * Touch Screen driver for SiS 9200 family I2C Touch panels
+ *
+ * Copyright (C) 2015 SiS, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/uaccess.h>
+#include <linux/irq.h>
+#include <asm/unaligned.h>
+#include <linux/input/mt.h> /*For Type-B Slot function*/
+#include <linux/crc-itu-t.h> /*For CRC Check*/
+
+#define SIS_I2C_NAME "sis_i2c_ts"
+#define SIS_SLAVE_ADDR 0x5c
+#define MAX_FINGERS 10
+
+/*Resolution mode*/
+/*Constant value*/
+#define SIS_MAX_X 4095
+#define SIS_MAX_Y 4095
+
+#define PACKET_BUFFER_SIZE 128
+
+#define SIS_CMD_NORMAL 0x0
+
+/* for new i2c format */
+#define TOUCHDOWN 0x3
+#define TOUCHUP 0x0
+#define MAX_BYTE 64
+#define PRESSURE_MAX 255
+
+/*Resolution diagonal */
+#define AREA_LENGTH_LONGER 5792
+/*((SIS_MAX_X^2) + (SIS_MAX_Y^2))^0.5*/
+#define AREA_LENGTH_SHORT 5792
+#define AREA_UNIT (5792/32)
+
+#define P_BYTECOUNT 0
+#define ALL_IN_ONE_PACKAGE 0x10
+#define IS_TOUCH(x) (x & 0x1)
+#define IS_HIDI2C(x) ((x & 0xF) == 0x06)
+#define IS_AREA(x) ((x >> 4) & 0x1)
+#define IS_PRESSURE(x) ((x >> 5) & 0x1)
+#define IS_SCANTIME(x) ((x >> 6) & 0x1)
+#define NORMAL_LEN_PER_POINT 6
+#define AREA_LEN_PER_POINT 2
+#define PRESSURE_LEN_PER_POINT 1
+
+#define TOUCH_FORMAT 0x1
+#define HIDI2C_FORMAT 0x6
+#define P_REPORT_ID 2
+#define BYTE_BYTECOUNT 2
+#define BYTE_ReportID 1
+#define BYTE_CRC_HIDI2C 0
+#define BYTE_CRC_I2C 2
+#define BYTE_SCANTIME 2
+
+#define MAX_SLOTS 15
+
+struct sis_slot {
+ int check_id;
+ int id;
+ unsigned short x, y;
+ u16 pressure;
+ u16 width;
+ u16 height;
+};
+
+struct point {
+ int id;
+ unsigned short x, y;
+ u16 pressure;
+ u16 width;
+ u16 height;
+};
+
+struct sistp_driver_data {
+ int id;
+ int fingers;
+ struct point pt[MAX_FINGERS];
+};
+
+struct sis_ts_data {
+ struct i2c_client *client;
+ struct input_dev *input_dev;
+ struct sistp_driver_data *tp_info;
+};
+
+/* Addresses to scan */
+static void sis_tpinfo_clear(struct sistp_driver_data *tp_info, int max);
+
+static int sis_cul_unit(u8 report_id)
+{
+ int ret = NORMAL_LEN_PER_POINT;
+
+ if (report_id != ALL_IN_ONE_PACKAGE) {
+ if (IS_AREA(report_id))
+ ret += AREA_LEN_PER_POINT;
+ if (IS_PRESSURE(report_id))
+ ret += PRESSURE_LEN_PER_POINT;
+ }
+
+ return ret;
+}
+
+static int sis_readpacket(struct i2c_client *client, u8 cmd, u8 *buf)
+{
+ u8 tmpbuf[MAX_BYTE] = {0}; /*MAX_BYTE = 64;*/
+ int ret;
+ int touchnum = 0;
+ int p_count = 0;
+ int touch_format_id = 0;
+ int locate = 0;
+ bool read_first = true;
+ /*
+ * New i2c format
+ * buf[0] = Low 8 bits of byte count value
+ * buf[1] = High 8 bits of byte count value
+ * buf[2] = Report ID
+ * buf[touch num * 6 + 2 ] = Touch information;
+ * 1 touch point has 6 bytes, it could be none if no touch
+ * buf[touch num * 6 + 3] = Touch numbers
+ *
+ * One touch point information include 6 bytes, the order is
+ *
+ * 1. status = touch down or touch up
+ * 2. id = finger id
+ * 3. x axis low 8 bits
+ * 4. x axis high 8 bits
+ * 5. y axis low 8 bits
+ * 6. y axis high 8 bits
+ */
+ do {
+ if (locate >= PACKET_BUFFER_SIZE) {
+ dev_err(&client->dev, "sis_readpacket: Buf Overflow\n");
+ return -EPERM;
+ }
+ ret = i2c_master_recv(client, tmpbuf, MAX_BYTE);
+
+ if (ret < 0) {
+ dev_err(&client->dev, "sis_readpacket: i2c transfer error\n");
+ return ret;
+ }
+ /*error package length of receiving data*/
+ else if (tmpbuf[P_BYTECOUNT] > MAX_BYTE) {
+ dev_err(&client->dev, "sis_readpacket: Error Bytecount\n");
+ return -EPERM;
+ }
+ if (read_first) {
+ /*access NO TOUCH event unless BUTTON NO TOUCH event*/
+ if (tmpbuf[P_BYTECOUNT] == 0)
+ return 0; /*touchnum is 0*/
+ }
+ /*
+ * skip parsing data when two devices are registered
+ * at the same slave address
+ * parsing data when P_REPORT_ID && 0xf is TOUCH_FORMAT
+ * or P_REPORT_ID is ALL_IN_ONE_PACKAGE
+ */
+ touch_format_id = tmpbuf[P_REPORT_ID] & 0xf;
+ if ((touch_format_id != TOUCH_FORMAT) &&
+ (touch_format_id != HIDI2C_FORMAT) &&
+ (tmpbuf[P_REPORT_ID] != ALL_IN_ONE_PACKAGE)) {
+ dev_err(&client->dev, "sis_readpacket: Error Report_ID\n");
+ return -EPERM;
+ }
+ p_count = (int) tmpbuf[P_BYTECOUNT] - 1; /*start from 0*/
+ if (tmpbuf[P_REPORT_ID] != ALL_IN_ONE_PACKAGE) {
+ if (IS_TOUCH(tmpbuf[P_REPORT_ID])) {
+ /*delete 2 byte crc*/
+ p_count -= BYTE_CRC_I2C;
+ } else if (IS_HIDI2C(tmpbuf[P_REPORT_ID])) {
+ p_count -= BYTE_CRC_HIDI2C;
+ } else { /*should not be happen*/
+ dev_err(&client->dev, "sis_readpacket: delete crc error\n");
+ return -EPERM;
+ }
+ if (IS_SCANTIME(tmpbuf[P_REPORT_ID]))
+ p_count -= BYTE_SCANTIME;
+ }
+ /*For ALL_IN_ONE_PACKAGE*/
+ if (read_first) {
+ touchnum = tmpbuf[p_count];
+ } else {
+ if (tmpbuf[p_count] != 0) {
+ dev_err(&client->dev, "sis_readpacket: get error package\n");
+ return -EPERM;
+ }
+ }
+
+ if ((touch_format_id != HIDI2C_FORMAT) &&
+ (tmpbuf[P_BYTECOUNT] > 3)) {
+ int crc_end = p_count + (IS_SCANTIME(
+ tmpbuf[P_REPORT_ID]) * 2);
+ u16 buf_crc = crc_itu_t(
+ 0, tmpbuf + 2, crc_end - 1);
+ int l_package_crc = (IS_SCANTIME(
+ tmpbuf[P_REPORT_ID]) * 2) + p_count + 1;
+ u16 package_crc = get_unaligned_le16(
+ &tmpbuf[l_package_crc]);
+
+ if (buf_crc != package_crc) {
+ dev_err(&client->dev, "sis_readpacket: CRC Error\n");
+ return -EPERM;
+ }
+ }
+
+ memcpy(&buf[locate], &tmpbuf[0], MAX_BYTE);
+ /*Buf_Data [0~63] [64~128]*/
+ locate += MAX_BYTE;
+ read_first = false;
+ } while (tmpbuf[P_REPORT_ID] != ALL_IN_ONE_PACKAGE &&
+ tmpbuf[p_count] > 5);
+ return touchnum;
+}
+
+static int sis_parse_i2c_event(u8 *buf, u8 fingers,
+ struct sistp_driver_data *tp_info,
+ int *check_id, struct sis_slot *sisdata)
+{
+ int point_unit;
+ u8 i = 0, pstatus = 0;
+ u8 px = 0, py = 0;
+ u8 p_area = 0;
+ u8 p_preasure = 0;
+ /*Parser and Get the sis data*/
+ point_unit = sis_cul_unit(buf[P_REPORT_ID]);
+ tp_info->fingers = fingers = (fingers > MAX_FINGERS ? 0 : fingers);
+
+ /*fingers 10 = 0 ~ 9*/
+ for (i = 0; i < fingers; i++) {
+ if ((buf[P_REPORT_ID] != ALL_IN_ONE_PACKAGE) && (i >= 5)) {
+ /*Calc point status*/
+ pstatus = BYTE_BYTECOUNT + BYTE_ReportID
+ + ((i - 5) * point_unit);
+ pstatus += 64;
+ } else {
+ pstatus = BYTE_BYTECOUNT + BYTE_ReportID
+ + (i * point_unit);
+ /*Calc point status*/
+ }
+ px = pstatus + 2; /*Calc point x_coord*/
+ py = px + 2; /*Calc point y_coord*/
+ if ((buf[pstatus]) == TOUCHUP) {
+ tp_info->pt[i].width = 0;
+ tp_info->pt[i].height = 0;
+ tp_info->pt[i].pressure = 0;
+ } else if (buf[P_REPORT_ID] == ALL_IN_ONE_PACKAGE
+ && (buf[pstatus]) == TOUCHDOWN) {
+ tp_info->pt[i].width = 1;
+ tp_info->pt[i].height = 1;
+ tp_info->pt[i].pressure = 1;
+ } else if ((buf[pstatus]) == TOUCHDOWN) {
+ p_area = py + 2;
+ p_preasure = py + 2 + (IS_AREA(buf[P_REPORT_ID]) * 2);
+ /*area*/
+ if (IS_AREA(buf[P_REPORT_ID])) {
+ tp_info->pt[i].width = buf[p_area];
+ tp_info->pt[i].height = buf[p_area + 1];
+ } else {
+ tp_info->pt[i].width = 1;
+ tp_info->pt[i].height = 1;
+ }
+ /*pressure*/
+ if (IS_PRESSURE(buf[P_REPORT_ID]))
+ tp_info->pt[i].pressure = (buf[p_preasure]);
+ else
+ tp_info->pt[i].pressure = 1;
+ } else
+ return -EPERM;
+
+ tp_info->pt[i].id = (buf[pstatus + 1]);
+ tp_info->pt[i].x = get_unaligned_le16(&buf[px]);
+ tp_info->pt[i].y = get_unaligned_le16(&buf[py]);
+
+ check_id[tp_info->pt[i].id] = 1;
+ sisdata[tp_info->pt[i].id].id = tp_info->pt[i].id;
+ sisdata[tp_info->pt[i].id].pressure = tp_info->pt[i].pressure;
+ sisdata[tp_info->pt[i].id].x = tp_info->pt[i].x;
+ sisdata[tp_info->pt[i].id].y = tp_info->pt[i].y;
+ sisdata[tp_info->pt[i].id].width = tp_info->pt[i].width
+ * AREA_UNIT;
+ sisdata[tp_info->pt[i].id].height = tp_info->pt[i].height
+ * AREA_UNIT;
+ }
+ return 0;
+}
+
+static irqreturn_t sis_ts_irq_handler(int irq, void *dev_id)
+{
+ struct sis_ts_data *ts = dev_id;
+ struct sistp_driver_data *tp_info = ts->tp_info;
+ int ret;
+ u8 buf[PACKET_BUFFER_SIZE] = {0};
+ u8 i = 0, fingers = 0;
+ int check_id[MAX_FINGERS];
+ static int pre_check_id[MAX_FINGERS];
+ struct sis_slot sisdata[MAX_FINGERS];
+
+ memset(check_id, 0, sizeof(int)*MAX_FINGERS);
+
+ /*I2C or SMBUS block data read*/
+ ret = sis_readpacket(ts->client, SIS_CMD_NORMAL, buf);
+ /*Error Number*/
+ if (ret < 0)
+ goto out;
+ /*access NO TOUCH event unless BUTTON NO TOUCH event*/
+ else if (ret == 0) {
+ fingers = 0;
+ sis_tpinfo_clear(tp_info, MAX_FINGERS);
+ goto type_b_report;
+ }
+
+ sis_tpinfo_clear(tp_info, MAX_FINGERS);
+ fingers = ret;
+
+ ret = sis_parse_i2c_event(buf, fingers, tp_info, check_id, sisdata);
+ if (ret < 0)
+ goto out;
+
+type_b_report:
+ for (i = 0; i < MAX_FINGERS; i++) {
+ if ((check_id[i] != pre_check_id[i]) && (check_id[i] != 1))
+ check_id[i] = -1;
+ }
+
+ for (i = 0; i < MAX_FINGERS; i++) {
+ if (check_id[i] == 1) {
+ input_mt_slot(ts->input_dev, i+1);
+ if (sisdata[i].pressure > 0) {
+ input_mt_report_slot_state(ts->input_dev,
+ MT_TOOL_FINGER, true);
+ input_report_abs(ts->input_dev,
+ ABS_MT_PRESSURE, sisdata[i].pressure);
+ input_report_abs(ts->input_dev,
+ ABS_MT_TOUCH_MAJOR, sisdata[i].width);
+ input_report_abs(ts->input_dev,
+ ABS_MT_TOUCH_MINOR, sisdata[i].height);
+ input_report_abs(ts->input_dev,
+ ABS_MT_POSITION_X, sisdata[i].x);
+ input_report_abs(ts->input_dev,
+ ABS_MT_POSITION_Y, sisdata[i].y);
+ } else {
+ input_mt_report_slot_state(ts->input_dev,
+ MT_TOOL_FINGER, false);
+ check_id[i] = 0;
+ }
+ } else if (check_id[i] == -1) {
+ input_mt_slot(ts->input_dev, i+1);
+ input_mt_report_slot_state(ts->input_dev,
+ MT_TOOL_FINGER, false);
+ check_id[i] = 0;
+ }
+ pre_check_id[i] = check_id[i];
+ }
+
+ input_sync(ts->input_dev);
+
+out:
+ return IRQ_HANDLED;
+}
+
+static void sis_tpinfo_clear(struct sistp_driver_data *tp_info, int max)
+{
+ int i = 0;
+
+ for (i = 0; i < max; i++) {
+ tp_info->pt[i].id = -1;
+ tp_info->pt[i].x = 0;
+ tp_info->pt[i].y = 0;
+ tp_info->pt[i].pressure = 0;
+ tp_info->pt[i].width = 0;
+ }
+ tp_info->id = 0x0;
+ tp_info->fingers = 0;
+}
+
+static int sis_ts_probe(
+ struct i2c_client *client, const struct i2c_device_id *id)
+{
+ int err = 0;
+ struct sis_ts_data *ts;
+
+ dev_dbg(&client->dev, "sis_ts_probe\n");
+ ts = devm_kzalloc(&client->dev, sizeof(struct sis_ts_data),
+ GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+ ts->tp_info = devm_kzalloc(&client->dev,
+ sizeof(struct sistp_driver_data),
+ GFP_KERNEL);
+ if (!ts->tp_info) {
+ dev_err(&client->dev, "Failed to allocate memory\n");
+ return -ENOMEM;
+ }
+
+ /*1. Init necessary buffers*/
+ ts->client = client;
+ i2c_set_clientdata(client, ts);
+
+ /*2. Allocate input device*/
+ ts->input_dev = devm_input_allocate_device(&client->dev);
+ if (!ts->input_dev) {
+ err = -ENOMEM;
+ dev_err(&client->dev, "sis_ts_probe: Failed to allocate input device\n");
+ goto err_input_dev_alloc_failed;
+ }
+ ts->input_dev->name = "sis_touch";
+
+ set_bit(EV_ABS, ts->input_dev->evbit);
+ set_bit(EV_KEY, ts->input_dev->evbit);
+ input_set_abs_params(ts->input_dev, ABS_MT_PRESSURE,
+ 0, PRESSURE_MAX, 0, 0);
+ input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR,
+ 0, AREA_LENGTH_LONGER, 0, 0);
+ input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MINOR,
+ 0, AREA_LENGTH_SHORT, 0, 0);
+ input_set_abs_params(ts->input_dev, ABS_MT_POSITION_X,
+ 0, SIS_MAX_X, 0, 0);
+ input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y,
+ 0, SIS_MAX_Y, 0, 0);
+ input_mt_init_slots(ts->input_dev, MAX_SLOTS, INPUT_MT_DIRECT);
+
+ /* add for touch keys */
+ set_bit(KEY_COMPOSE, ts->input_dev->keybit);
+ set_bit(KEY_BACK, ts->input_dev->keybit);
+ set_bit(KEY_MENU, ts->input_dev->keybit);
+ set_bit(KEY_HOME, ts->input_dev->keybit);
+
+ /*3. Register input device to core*/
+ err = input_register_device(ts->input_dev);
+ if (err) {
+ dev_err(&client->dev,
+ "sis_ts_probe: Unable to register %s input device\n",
+ ts->input_dev->name);
+ goto err_input_register_device_failed;
+ }
+
+ /*4. irq setup*/
+ err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+ sis_ts_irq_handler,
+ IRQF_TRIGGER_FALLING, client->name,
+ ts);
+ if (err < 0) {
+ dev_err(&client->dev, "Failed to request touchscreen IRQ\n");
+ goto err_request_threaded_irq;
+ }
+
+ dev_dbg(&client->dev, "sis SIS_SLAVE_ADDR: %d\n", SIS_SLAVE_ADDR);
+ return 0;
+err_request_threaded_irq:
+err_input_register_device_failed:
+ input_free_device(ts->input_dev);
+err_input_dev_alloc_failed:
+ kfree(ts->tp_info);
+ kfree(ts);
+ return err;
+}
+
+static int sis_ts_remove(struct i2c_client *client)
+{
+ struct sis_ts_data *ts = i2c_get_clientdata(client);
+
+ input_unregister_device(ts->input_dev);
+ input_free_device(ts->input_dev);
+ kfree(ts->tp_info);
+ kfree(ts);
+ return 0;
+}
+
+static int __maybe_unused sis_ts_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ disable_irq(client->irq);
+ return 0;
+}
+
+static int __maybe_unused sis_ts_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ enable_irq(client->irq);
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(sis_ts_pm, sis_ts_suspend, sis_ts_resume);
+
+static const struct i2c_device_id sis_ts_id[] = {
+ { SIS_I2C_NAME, 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, sis_ts_id);
+
+static struct i2c_driver sis_ts_driver = {
+ .driver = {
+ .name = SIS_I2C_NAME,
+ .owner = THIS_MODULE,
+ .pm = &sis_ts_pm,
+ },
+ .probe = sis_ts_probe,
+ .remove = sis_ts_remove,
+ .id_table = sis_ts_id,
+};
+module_i2c_driver(sis_ts_driver);
+
+MODULE_DESCRIPTION("SiS 9200 Family Touchscreen Driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1
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