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// SPDX-License-Identifier: GPL-2.0
// Samsung S6SY761 Touchscreen device driver
//
// Copyright (c) 2017 Samsung Electronics Co., Ltd.
// Copyright (c) 2017 Andi Shyti <andi.shyti@samsung.com>
#include <asm/unaligned.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
/* commands */
#define S6SY761_SENSE_ON 0x10
#define S6SY761_SENSE_OFF 0x11
#define S6SY761_TOUCH_FUNCTION 0x30 /* R/W for get/set */
#define S6SY761_FIRMWARE_INTEGRITY 0x21
#define S6SY761_PANEL_INFO 0x23
#define S6SY761_DEVICE_ID 0x52
#define S6SY761_BOOT_STATUS 0x55
#define S6SY761_READ_ONE_EVENT 0x60
#define S6SY761_READ_ALL_EVENT 0x61
#define S6SY761_CLEAR_EVENT_STACK 0x62
#define S6SY761_APPLICATION_MODE 0xe4
/* events */
#define S6SY761_EVENT_INFO 0x02
#define S6SY761_EVENT_VENDOR_INFO 0x07
/* info */
#define S6SY761_INFO_BOOT_COMPLETE 0x00
/* firmware status */
#define S6SY761_FW_OK 0x80
/*
* the functionalities are put as a reference
* as in the device I am using none of them
* works therefore not used in this driver yet.
*/
/* touchscreen functionalities */
#define S6SY761_MASK_TOUCH BIT(0)
#define S6SY761_MASK_HOVER BIT(1)
#define S6SY761_MASK_COVER BIT(2)
#define S6SY761_MASK_GLOVE BIT(3)
#define S6SY761_MASK_STYLUS BIT(4)
#define S6SY761_MASK_PALM BIT(5)
#define S6SY761_MASK_WET BIT(6)
#define S6SY761_MASK_PROXIMITY BIT(7)
/* boot status (BS) */
#define S6SY761_BS_BOOT_LOADER 0x10
#define S6SY761_BS_APPLICATION 0x20
/* event id */
#define S6SY761_EVENT_ID_COORDINATE 0x00
#define S6SY761_EVENT_ID_STATUS 0x01
/* event register masks */
#define S6SY761_MASK_TOUCH_STATE 0xc0 /* byte 0 */
#define S6SY761_MASK_TID 0x3c
#define S6SY761_MASK_EID 0x03
#define S6SY761_MASK_X 0xf0 /* byte 3 */
#define S6SY761_MASK_Y 0x0f
#define S6SY761_MASK_Z 0x3f /* byte 6 */
#define S6SY761_MASK_LEFT_EVENTS 0x3f /* byte 7 */
#define S6SY761_MASK_TOUCH_TYPE 0xc0 /* MSB in byte 6, LSB in byte 7 */
/* event touch state values */
#define S6SY761_TS_NONE 0x00
#define S6SY761_TS_PRESS 0x01
#define S6SY761_TS_MOVE 0x02
#define S6SY761_TS_RELEASE 0x03
/* application modes */
#define S6SY761_APP_NORMAL 0x0
#define S6SY761_APP_LOW_POWER 0x1
#define S6SY761_APP_TEST 0x2
#define S6SY761_APP_FLASH 0x3
#define S6SY761_APP_SLEEP 0x4
#define S6SY761_EVENT_SIZE 8
#define S6SY761_EVENT_COUNT 32
#define S6SY761_DEVID_SIZE 3
#define S6SY761_PANEL_ID_SIZE 11
#define S6SY761_TS_STATUS_SIZE 5
#define S6SY761_MAX_FINGERS 10
#define S6SY761_DEV_NAME "s6sy761"
enum s6sy761_regulators {
S6SY761_REGULATOR_VDD,
S6SY761_REGULATOR_AVDD,
};
struct s6sy761_data {
struct i2c_client *client;
struct regulator_bulk_data regulators[2];
struct input_dev *input;
struct touchscreen_properties prop;
u8 data[S6SY761_EVENT_SIZE * S6SY761_EVENT_COUNT];
u16 devid;
u8 tx_channel;
};
/*
* We can't simply use i2c_smbus_read_i2c_block_data because we
* need to read more than 255 bytes
*/
static int s6sy761_read_events(struct s6sy761_data *sdata, u16 n_events)
{
u8 cmd = S6SY761_READ_ALL_EVENT;
struct i2c_msg msgs[2] = {
{
.addr = sdata->client->addr,
.len = 1,
.buf = &cmd,
},
{
.addr = sdata->client->addr,
.flags = I2C_M_RD,
.len = (n_events * S6SY761_EVENT_SIZE),
.buf = sdata->data + S6SY761_EVENT_SIZE,
},
};
int ret;
ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs));
if (ret < 0)
return ret;
return ret == ARRAY_SIZE(msgs) ? 0 : -EIO;
}
static void s6sy761_report_coordinates(struct s6sy761_data *sdata,
u8 *event, u8 tid)
{
u8 major = event[4];
u8 minor = event[5];
u8 z = event[6] & S6SY761_MASK_Z;
u16 x = (event[1] << 3) | ((event[3] & S6SY761_MASK_X) >> 4);
u16 y = (event[2] << 3) | (event[3] & S6SY761_MASK_Y);
input_mt_slot(sdata->input, tid);
input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true);
input_report_abs(sdata->input, ABS_MT_POSITION_X, x);
input_report_abs(sdata->input, ABS_MT_POSITION_Y, y);
input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, major);
input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, minor);
input_report_abs(sdata->input, ABS_MT_PRESSURE, z);
input_sync(sdata->input);
}
static void s6sy761_report_release(struct s6sy761_data *sdata,
u8 *event, u8 tid)
{
input_mt_slot(sdata->input, tid);
input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, false);
input_sync(sdata->input);
}
static void s6sy761_handle_coordinates(struct s6sy761_data *sdata, u8 *event)
{
u8 tid;
u8 touch_state;
if (unlikely(!(event[0] & S6SY761_MASK_TID)))
return;
tid = ((event[0] & S6SY761_MASK_TID) >> 2) - 1;
touch_state = (event[0] & S6SY761_MASK_TOUCH_STATE) >> 6;
switch (touch_state) {
case S6SY761_TS_NONE:
break;
case S6SY761_TS_RELEASE:
s6sy761_report_release(sdata, event, tid);
break;
case S6SY761_TS_PRESS:
case S6SY761_TS_MOVE:
s6sy761_report_coordinates(sdata, event, tid);
break;
}
}
static void s6sy761_handle_events(struct s6sy761_data *sdata, u8 n_events)
{
int i;
for (i = 0; i < n_events; i++) {
u8 *event = &sdata->data[i * S6SY761_EVENT_SIZE];
u8 event_id = event[0] & S6SY761_MASK_EID;
if (!event[0])
return;
switch (event_id) {
case S6SY761_EVENT_ID_COORDINATE:
s6sy761_handle_coordinates(sdata, event);
break;
case S6SY761_EVENT_ID_STATUS:
break;
default:
break;
}
}
}
static irqreturn_t s6sy761_irq_handler(int irq, void *dev)
{
struct s6sy761_data *sdata = dev;
int ret;
u8 n_events;
ret = i2c_smbus_read_i2c_block_data(sdata->client,
S6SY761_READ_ONE_EVENT,
S6SY761_EVENT_SIZE,
sdata->data);
if (ret < 0) {
dev_err(&sdata->client->dev, "failed to read events\n");
return IRQ_HANDLED;
}
if (!sdata->data[0])
return IRQ_HANDLED;
n_events = sdata->data[7] & S6SY761_MASK_LEFT_EVENTS;
if (unlikely(n_events > S6SY761_EVENT_COUNT - 1))
return IRQ_HANDLED;
if (n_events) {
ret = s6sy761_read_events(sdata, n_events);
if (ret < 0) {
dev_err(&sdata->client->dev, "failed to read events\n");
return IRQ_HANDLED;
}
}
s6sy761_handle_events(sdata, n_events + 1);
return IRQ_HANDLED;
}
static int s6sy761_input_open(struct input_dev *dev)
{
struct s6sy761_data *sdata = input_get_drvdata(dev);
return i2c_smbus_write_byte(sdata->client, S6SY761_SENSE_ON);
}
static void s6sy761_input_close(struct input_dev *dev)
{
struct s6sy761_data *sdata = input_get_drvdata(dev);
int ret;
ret = i2c_smbus_write_byte(sdata->client, S6SY761_SENSE_OFF);
if (ret)
dev_err(&sdata->client->dev, "failed to turn off sensing\n");
}
static ssize_t s6sy761_sysfs_devid(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct s6sy761_data *sdata = dev_get_drvdata(dev);
return sprintf(buf, &q
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