// SPDX-License-Identifier: GPL-2.0-or-later
/*
* MELFAS MIP4 Touchscreen
*
* Copyright (C) 2016 MELFAS Inc.
*
* Author : Sangwon Jee <[email protected]>
*/
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/unaligned.h>
#define MIP4_DEVICE_NAME "mip4_ts"
/*****************************************************************
* Protocol
* Version : MIP 4.0 Rev 5.4
*****************************************************************/
/* Address */
#define MIP4_R0_BOOT 0x00
#define MIP4_R1_BOOT_MODE 0x01
#define MIP4_R1_BOOT_BUF_ADDR 0x10
#define MIP4_R1_BOOT_STATUS 0x20
#define MIP4_R1_BOOT_CMD 0x30
#define MIP4_R1_BOOT_TARGET_ADDR 0x40
#define MIP4_R1_BOOT_SIZE 0x44
#define MIP4_R0_INFO 0x01
#define MIP4_R1_INFO_PRODUCT_NAME 0x00
#define MIP4_R1_INFO_RESOLUTION_X 0x10
#define MIP4_R1_INFO_RESOLUTION_Y 0x12
#define MIP4_R1_INFO_NODE_NUM_X 0x14
#define MIP4_R1_INFO_NODE_NUM_Y 0x15
#define MIP4_R1_INFO_KEY_NUM 0x16
#define MIP4_R1_INFO_PRESSURE_NUM 0x17
#define MIP4_R1_INFO_LENGTH_X 0x18
#define MIP4_R1_INFO_LENGTH_Y 0x1A
#define MIP4_R1_INFO_PPM_X 0x1C
#define MIP4_R1_INFO_PPM_Y 0x1D
#define MIP4_R1_INFO_VERSION_BOOT 0x20
#define MIP4_R1_INFO_VERSION_CORE 0x22
#define MIP4_R1_INFO_VERSION_APP 0x24
#define MIP4_R1_INFO_VERSION_PARAM 0x26
#define MIP4_R1_INFO_SECT_BOOT_START 0x30
#define MIP4_R1_INFO_SECT_BOOT_END 0x31
#define MIP4_R1_INFO_SECT_CORE_START 0x32
#define MIP4_R1_INFO_SECT_CORE_END 0x33
#define MIP4_R1_INFO_SECT_APP_START 0x34
#define MIP4_R1_INFO_SECT_APP_END 0x35
#define MIP4_R1_INFO_SECT_PARAM_START 0x36
#define MIP4_R1_INFO_SECT_PARAM_END 0x37
#define MIP4_R1_INFO_BUILD_DATE 0x40
#define MIP4_R1_INFO_BUILD_TIME 0x44
#define MIP4_R1_INFO_CHECKSUM_PRECALC 0x48
#define MIP4_R1_INFO_CHECKSUM_REALTIME 0x4A
#define MIP4_R1_INFO_PROTOCOL_NAME 0x50
#define MIP4_R1_INFO_PROTOCOL_VERSION 0x58
#define MIP4_R1_INFO_IC_ID 0x70
#define MIP4_R1_INFO_IC_NAME 0x71
#define MIP4_R1_INFO_IC_VENDOR_ID 0x75
#define MIP4_R1_INFO_IC_HW_CATEGORY 0x77
#define MIP4_R1_INFO_CONTACT_THD_SCR 0x78
#define MIP4_R1_INFO_CONTACT_THD_KEY 0x7A
#define MIP4_R1_INFO_PID 0x7C
#define MIP4_R1_INFO_VID 0x7E
#define MIP4_R1_INFO_SLAVE_ADDR 0x80
#define MIP4_R0_EVENT 0x02
#define MIP4_R1_EVENT_SUPPORTED_FUNC 0x00
#define MIP4_R1_EVENT_FORMAT 0x04
#define MIP4_R1_EVENT_SIZE 0x06
#define MIP4_R1_EVENT_PACKET_INFO 0x10
#define MIP4_R1_EVENT_PACKET_DATA 0x11
#define MIP4_R0_CTRL 0x06
#define MIP4_R1_CTRL_READY_STATUS 0x00
#define MIP4_R1_CTRL_EVENT_READY 0x01
#define MIP4_R1_CTRL_MODE 0x10
#define MIP4_R1_CTRL_EVENT_TRIGGER_TYPE 0x11
#define MIP4_R1_CTRL_RECALIBRATE 0x12
#define MIP4_R1_CTRL_POWER_STATE 0x13
#define MIP4_R1_CTRL_GESTURE_TYPE 0x14
#define MIP4_R1_CTRL_DISABLE_ESD_ALERT 0x18
#define MIP4_R1_CTRL_CHARGER_MODE 0x19
#define MIP4_R1_CTRL_HIGH_SENS_MODE 0x1A
#define MIP4_R1_CTRL_WINDOW_MODE 0x1B
#define MIP4_R1_CTRL_PALM_REJECTION 0x1C
#define MIP4_R1_CTRL_EDGE_CORRECTION 0x1D
#define MIP4_R1_CTRL_ENTER_GLOVE_MODE 0x1E
#define MIP4_R1_CTRL_I2C_ON_LPM 0x1F
#define MIP4_R1_CTRL_GESTURE_DEBUG 0x20
#define MIP4_R1_CTRL_PALM_EVENT 0x22
#define MIP4_R1_CTRL_PROXIMITY_SENSING 0x23
/* Value */
#define MIP4_BOOT_MODE_BOOT 0x01
#define MIP4_BOOT_MODE_APP 0x02
#define MIP4_BOOT_STATUS_BUSY 0x05
#define MIP4_BOOT_STATUS_ERROR 0x0E
#define MIP4_BOOT_STATUS_DONE 0xA0
#define MIP4_BOOT_CMD_MASS_ERASE 0x15
#define MIP4_BOOT_CMD_PROGRAM 0x54
#define MIP4_BOOT_CMD_ERASE 0x8F
#define MIP4_BOOT_CMD_WRITE 0xA5
#define MIP4_BOOT_CMD_READ 0xC2
#define MIP4_EVENT_INPUT_TYPE_KEY 0
#define MIP4_EVENT_INPUT_TYPE_SCREEN 1
#define MIP4_EVENT_INPUT_TYPE_PROXIMITY 2
#define I2C_RETRY_COUNT 3 /* 2~ */
#define MIP4_BUF_SIZE 128
#define MIP4_MAX_FINGERS 10
#define MIP4_MAX_KEYS 4
#define MIP4_TOUCH_MAJOR_MIN 0
#define MIP4_TOUCH_MAJOR_MAX 255
#define MIP4_TOUCH_MINOR_MIN 0
#define MIP4_TOUCH_MINOR_MAX 255
#define MIP4_PRESSURE_MIN 0
#define MIP4_PRESSURE_MAX 255
#define MIP4_FW_NAME "melfas_mip4.fw"
#define MIP4_FW_UPDATE_DEBUG 0 /* 0 (default) or 1 */
struct mip4_fw_version {
u16 boot;
u16 core;
u16 app;
u16 param;
};
struct mip4_ts {
struct i2c_client *client;
struct input_dev *input;
struct gpio_desc *gpio_ce;
char phys[32];
char product_name[16];
u16 product_id;
char ic_name[4];
char fw_name[32];
unsigned int max_x;
unsigned int max_y;
u8 node_x;
u8 node_y;
u8 node_key;
unsigned int ppm_x;
unsigned int ppm_y;
struct mip4_fw_version fw_version;
unsigned int event_size;
unsigned int event_format;
unsigned int key_num;
unsigned short key_code[MIP4_MAX_KEYS];
bool wake_irq_enabled;
u8 buf[MIP4_BUF_SIZE];
};
static int mip4_i2c_xfer(struct mip4_ts *ts,
char *write_buf, unsigned int write_len,
char *read_buf, unsigned int read_len)
{
struct i2c_msg msg[] = {
{
.addr = ts->client->addr,
.flags = 0,
.buf = write_buf,
.len = write_len,
}, {
.addr = ts->client->addr,
.flags = I2C_M_RD,
.buf = read_buf,
.len = read_len,
},
};
int retry = I2C_RETRY_COUNT;
int res;
int error;
do {
res = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
if (res == ARRAY_SIZE(msg))
return 0;
error = res < 0 ? res : -EIO;
dev_err(&ts->client->dev,
"%s - i2c_transfer failed: %d (%d)\n",
__func__, error, res);
} while (--retry);
return error;
}
static void mip4_parse_fw_version(const u8 *buf, struct mip4_fw_version *v)
{
v->boot = get_unaligned_le16(buf + 0);
v->core = get_unaligned_le16(buf + 2);
v->app = get_unaligned_le16(buf + 4);
v->param = get_unaligned_le16(buf + 6);
}
/*
* Read chip firmware version
*/
static int mip4_get_fw_version(struct mip4_ts *ts)
{
u8 cmd[] = { MIP4_R0_INFO, MIP4_R1_INFO_VERSION_BOOT };
u8 buf[sizeof(ts->fw_version)];
int error;
error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, sizeof(buf));
if (error) {
memset(&ts->fw_version, 0xff, sizeof(ts->fw_version));
return error;
}
mip4_parse_fw_version(buf, &ts->fw_version);
return 0;
}
/*
* Fetch device characteristics
*/
static int mip4_query_device(struct mip4_ts *ts)
{
union i2c_smbus_data dummy;
int error;
u8 cmd[2];
u8 buf[14];
/*
* Make sure there is something at this address as we do not
* consider subsequent failures as fatal.
*/
if (i2c_smbus_xfer(ts->client->adapter, ts->client->addr,
0, I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
dev_err(&ts->client->dev, "nothing at this address\n");
return -ENXIO;
}
/* Product name */
cmd[0] = MIP4_R0_INFO;
cmd[1] = MIP4_R1_INFO_PRODUCT_NAME;
error = mip4_i2c_xfer(ts, cmd, sizeof(cmd),
ts->product_name, sizeof(ts->product_name));
if (error)
dev_warn(&ts->client->dev,
"Failed to retrieve product name: %d\n", error);
else
dev_dbg(&ts->client->dev, "product name: %.*s\n",
(int)sizeof(ts->product_name), ts->product_name);
/* Product ID */
cmd[0] = MIP4_R0_INFO;
cmd[1] = MIP4_R1_INFO_PID;
error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 2);
if (error) {
dev_warn(&ts->client->dev,
"Failed to retrieve product id: %d\n", error);
} else {
ts->product_id = get_unaligned_le16(&buf[0]);
dev_dbg(&ts->client->dev, "product id: %04X\n", ts->product_id);
}
/* Firmware name */
snprintf(ts->fw_name, sizeof(ts->fw_name),
"melfas_mip4_%04X.fw", ts->product_id);
dev_dbg(&ts->client->dev, "firmware name: %s\n", ts->fw_name);
/* IC name */
cmd[0] = MIP4_R0_INFO;
cmd[1] = MIP4_R1_INFO_IC_NAME;
error = mip4_i2c_xfer(ts, cmd, sizeof(cmd),
ts->ic_name, sizeof(ts->ic_name));
if (error)
dev_warn(&ts->client->dev,
"Failed to retrieve IC name: %d\n", error);
else
dev_dbg(&ts->client->dev, "IC name: %.*s\n",
(int)sizeof(ts->ic_name), ts->ic_name);
/* Firmware version */
error = mip4_get_fw_version(ts);
if (error)
dev_warn(&ts->client->dev,
"Failed to retrieve FW version: %d\n", error);
else
dev_dbg(&ts->client->dev, "F/W Version: %04X %04X %04X %04X\n",
ts->fw_version.boot, ts->fw_version.core,
ts->fw_version.app, ts->fw_version.param);
/* Resolution */
cmd[0] = MIP4_R0_INFO;
cmd[1] = MIP4_R1_INFO_RESOLUTION_X;
error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 14);
if (error) {
dev_warn(&ts->client->dev,
"Failed to retrieve touchscreen parameters: %d\n",
error);
} else {
ts->max_x = get_unaligned_le16(&buf[0]);
ts->max_y = get_unaligned_le16(&buf[2]);
dev_dbg(&ts->client->dev, "max_x: %d, max_y: %d\n",
ts->max_x, ts->max_y);
ts->node_x = buf[4];
ts->node_y = buf[5];
ts->node_key = buf[6];
dev_dbg(&ts->client->dev,
"node_x: %d, node_y: %d, node_key: %d\n",
ts->node_x, ts->node_y, ts->node_key);
ts->ppm_x = buf[12];
ts->ppm_y = buf[13];
dev_dbg(&ts->client->dev, "ppm_x: %d, ppm_y: %d\n",
ts->ppm_x, ts->ppm_y);
/* Key ts */
if (ts->node_key > 0)
ts->key_num = ts->node_key;
}
/* Protocol */
cmd[0] = MIP4_R0_EVENT;
cmd[1] = MIP4_R1_EVENT_SUPPORTED_FUNC;
error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 7);
if (error) {
dev_warn(&ts->client->dev,
"Failed to retrieve device type: %d\n", error);
ts->event_format = 0xff;
} else {
ts->event_format = get_unaligned_le16(&buf[4]);
ts->event_size = buf[6];
dev_dbg(&ts->client->dev, "event_format: %d, event_size: %d\n",
ts->event_format, ts->event_size);
if (ts->event_format == 2 || ts->event_format > 3)
dev_warn(&ts->client->dev,
"Unknown event format %d\n", ts->event_format);
}
return 0;
}
static int mip4_power_on(struct mip4_ts *ts)
{
if (ts->gpio_ce) {
gpiod_set_value_cansleep(ts->gpio_ce, 1);
/* Booting delay : 200~300ms */
usleep_range(200 * 1000, 300 * 1000);
}
return 0;
}
static void mip4_power_off(struct mip4_ts *ts)
{
if (ts->gpio_ce)
gpiod_set_value_cansleep(ts->gpio_ce, 0);
}
/*
* Clear touch input event status
*/
static void mip4_clear_input(struct mip4_ts *ts)
{
int i;
/* Screen */
for (i = 0; i < MIP4_MAX_FINGERS; i++) {
input_mt_slot(ts->input, i);
input_mt_report_slot_inactive(ts->input);
}
/* Keys */
for (i = 0; i < ts->key_num; i++)
input_report_key(ts->input, ts->key_code[i], 0);
input_sync(ts->input);
}
static int mip4_enable(struct mip4_ts *ts)
{
int error;
error = mip4_power_on(ts);
if (error)
return error;
enable_irq(ts->client->irq);
return 0;
}
static void mip4_disable(struct mip4_ts *ts)
{
disable_irq(ts->client->irq);
mip4_power_off(ts);
mip4_clear_input(ts);
}
/*****************************************************************
* Input handling
*****************************************************************/
static void mip4_report_keys(struct mip4_ts *ts, u8 *packet)
{
u8 key;
bool down;
switch (ts->event_format) {
case 0:
case 1:
key = packet[0] & 0x0F;
down = packet[0] & 0x80;
break;
case 3:
default:
key = packet[0] & 0x0F;
down = packet[1] & 0x01;
break;
}
/* Report key event */
if (key >= 1 && key <= ts->key_num) {
unsigned short keycode = ts->key_code[key - 1];
dev_dbg(&ts->client->dev,
"Key - ID: %d, keycode: %d, state: %d\n",
key, keycode, down);
input_event(ts->input, EV_MSC, MSC_SCAN, keycode);
input_report_key(ts->input, keycode, down);
} else {
dev_err(&ts->client->dev, "Unknown key: %d\n", key);
}
}
static void mip4_report_touch(struct mip4_ts *ts, u8 *packet)
{
int id;
bool __always_unused hover;
bool palm;
bool state;
u16 x, y;
u8 __always_unused pressure_stage = 0;
u8 pressure;
u8 __always_unused size;
u8 touch_major;
u8 touch_minor;
switch (ts->event_format) {
case 0:
case 1:
/* Touch only */
state = packet[0] & BIT(7);
hover = packet[0] & BIT(5);
palm = packet[0] & BIT(4);
id = (packet[0] & 0x0F) - 1;
x = ((packet[1] & 0x0F) << 8) | packet[2];
y = (((packet[1] >> 4) & 0x0F) << 8) |
packet[3];
pressure = packet[4];
size = packet[5];
if (ts->event_format == 0) {
touch_major = packet[5];
touch_minor = packet[5];
} else {
touch_major = packet[6];
touch_minor = packet[7];
}
break;
case 3:
default:
/* Touch + Force(Pressure) */
id = (packet[0] & 0x0F) - 1;
hover = packet[1] & BIT(2);
palm = packet[1] & BIT(1);
state = packet[1] & BIT(0);
x = ((packet[2] & 0x0F) << 8) | packet[3];
y = (((packet[2] >> 4) & 0x0F) << 8) |
packet[4];
size = packet[6];
pressure_stage = (packet[7] & 0xF0) >> 4;
pressure = ((packet[7] & 0x0F) << 8) |
packet[8];
touch_major = packet[9];
touch_minor = packet[10];
break;
}
dev_dbg(&ts->client->dev,
"Screen - Slot: %d State: %d X: %04d Y: %04d Z: %d\n",
id, state, x, y, pressure);
if (unlikely(id < 0 || id >= MIP4_MAX_FINGERS)) {
dev_err(&ts->client->dev, "Screen - invalid slot ID: %d\n", id);
goto out;
}
input_mt_slot(ts->input, id);
if (input_mt_report_slot_state(ts->input,
palm ? MT_TOOL_PALM : MT_TOOL_FINGER,
state)) {
input_report_abs(ts->input, ABS_MT_POSITION_X, x);
input_report_abs(ts->input, ABS_MT_POSITION_Y, y);
input_report_abs(ts->input, ABS_MT_PRESSURE, pressure);
input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, touch_major);
input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, touch_minor);
}
out:
input_mt_sync_frame(ts->input);
}
static int mip4_handle_packet(struct mip4_ts *ts, u8 *packet)
{
u8 type;
switch (ts->event_format) {
case 0:
case 1:
type = (packet[0] & 0x40) >> 6;
break;
case 3:
type = (packet[0] & 0xF0) >> 4;
break;
default:
/* Should not happen unless we have corrupted firmware */
return -EINVAL;
}
dev_dbg(&ts->client->dev, "Type: %d\n", type);
/* Report input event */
switch (type) {
case MIP4_EVENT_INPUT_TYPE_KEY:
mip4_report_keys(ts, packet);
break;
case MIP4_EVENT_INPUT_TYPE_SCREEN:
mip4_report_touch(ts, packet);
break;
default:
dev_err(&ts->client->dev, "Unknown event type: %d\n", type);
break;
}
return 0;
}
static irqreturn_t mip4_interrupt(int irq, void *dev_id)
{
struct mip4_ts *ts = dev_id;
struct i2c_client *client = ts->client;
unsigned int i;
int error;
u8 cmd[2];
u8 size;
bool alert;
/* Read packet info */
cmd[0] = MIP4_R0_EVENT;
cmd[1] = MIP4_R1_EVENT_PACKET_INFO;
error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), ts->buf, 1);
if (error) {
dev_err(&client->dev,
"Failed to read packet info: %d\n", error);
goto out;
}
size = ts->buf[0] & 0x7F;
alert = ts->buf[0] & BIT(7);
dev_dbg(&client->dev, "packet size: %d, alert: %d\n", size, alert);
/* Check size */
if (!size) {
dev_err(&client->dev, "Empty packet\n");
goto out;
}
/* Read packet data */
cmd[0] = MIP4_R0_EVENT;
cmd[1] = MIP4_R1_EVENT_PACKET_DATA;
error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), ts->buf, size);
if (error) {
dev_err(&client->dev,
"Failed to read packet data: %d\n", error);
goto out;
}
if (alert) {
dev_dbg(&client->dev, "Alert: %d\n", ts->buf[0]);
} else {
for (i = 0; i < size; i += ts->event_size) {
error = mip4_handle_packet(ts, &ts->buf[i]);
if (error)
break;
}
input_sync(ts->input);
}
out:
return IRQ_HANDLED;
}
static int mip4_input_open(struct input_dev *dev)
{
struct mip4_ts *ts = input_get_drvdata(dev);
return mip4_enable(ts);
}
static void mip4_input_close(struct input_dev *dev)
{
struct mip4_ts *ts = input_get_drvdata(dev);
mip4_disable(ts);
}
/*****************************************************************
* Firmware update
*****************************************************************/
/* Firmware Info */
#define MIP4_BL_PAGE_SIZE 512 /* 512 */
#define MIP4_BL_PACKET_SIZE 512 /* 512, 256, 128, 64, ... */
/*
* Firmware binary tail info
*/
struct mip4_bin_tail {
u8 tail_mark[4];
u8 chip_name[4];
__le32 bin_start_addr;
__le32 bin_length;
__le16 ver_boot;
__le16 ver_core;
__le16 ver_app;
__le16 ver_param;
u8 boot_start;
u8 boot_end;
u8 core_start;
u8 core_end;
u8 app_start;
u8 app_end;
u8 param_start;
u8 param_end;
u8 checksum_type;
u8 hw_category;
__le16 param_id;
__le32 param_length;
__le32 build_date;
__le32 build_time;
__le32 reserved1;
__le32 reserved2;
__le16 reserved3;
__le16 tail_size;
__le32 crc;
} __packed;
#define MIP4_BIN_TAIL_MARK "MBT\001"
#define MIP4_BIN_TAIL_SIZE (sizeof(struct mip4_bin_tail))
/*
* Bootloader - Read status
*/
static int mip4_bl_read_status(struct mip4_ts *ts)
{
u8 cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_STATUS };
u8 result;
struct i2c_msg msg[] = {
{
.addr = ts->client->addr,
.flags = 0,
.buf = cmd,
.len = sizeof(cmd),
}, {
.addr = ts->client->addr,
.flags = I2C_M_RD,
.buf = &result,
.len = sizeof(result),
},
};
int ret;
int error;
int retry = 1000;
do {
ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
if (ret != ARRAY_SIZE(msg)) {
error = ret < 0 ? ret : -EIO;
dev_err(&ts->client->dev,
"Failed to read bootloader status: %d\n",
error);
return error;
}
switch (result) {
case MIP4_BOOT_STATUS_DONE:
dev_dbg(&ts->client->dev, "%s - done\n", __func__);
return 0;
case MIP4_BOOT_STATUS_ERROR:
dev_err(&ts->client->dev, "Bootloader failure\n");
return -EIO;
case MIP4_BOOT_STATUS_BUSY:
dev_dbg(&ts->client->dev, "%s - Busy\n", __func__);
error = -EBUSY;
break;
default:
dev_err(&ts->client->dev,
"Unexpected bootloader status: %#02x\n",
result);
error = -EINVAL;
break;
}
usleep_range(1000, 2000);
} while (--retry);
return error;
}
/*
* Bootloader - Change mode
*/
static int mip4_bl_change_mode(struct mip4_ts *ts, u8 mode)
{
u8 mode_chg_cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_MODE, mode };
u8 mode_read_cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_MODE };
u8 result;
struct i2c_msg msg[] = {
{
.addr = ts->client->addr,
.flags = 0,
.buf = mode_read_cmd,
.len = sizeof(mode_read_cmd),
}, {
.addr = ts->client->addr,
.flags = I2C_M_RD,
.buf = &result,
.len = sizeof(result),
},
};
int retry = 10;
int ret;
int error;
do {
/* Send mode change command */
ret = i2c_master_send(ts->client,
mode_chg_cmd, sizeof(mode_chg_cmd));
if (ret != sizeof(mode_chg_cmd)) {
error = ret < 0 ? ret : -EIO;
dev_err(&ts->client->dev,
"Failed to send %d mode change: %d (%d)\n",
mode, error, ret);
return error;
}
dev_dbg(&ts->client->dev,
"Sent mode change request (mode: %d)\n", mode);
/* Wait */
msleep(1000);
/* Verify target mode */
ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
if (ret != ARRAY_SIZE(msg)) {
error = ret < 0 ? ret : -EIO;
dev_err(&ts->client->dev,
"Failed to read device mode: %d\n", error);
return error;
}
dev_dbg(&ts->client->dev,
"Current device mode: %d, want: %d\n", result, mode);
if (result == mode)
return 0;
} while (--retry);
return -EIO;
}
/*
* Bootloader - Start bootloader mode
*/
static int mip4_bl_enter(struct mip4_ts *ts)
{
return mip4_bl_change_mode(ts, MIP4_BOOT_MODE_BOOT);
}
/*
* Bootloader - Exit bootloader mode
*/
static int mip4_bl_exit(struct mip4_ts *ts)
{
return mip4_bl_change_mode(ts, MIP4_BOOT_MODE_APP);
}
static int mip4_bl_get_address(struct mip4_ts *ts, u16 *buf_addr)
{
u8 cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_BUF_ADDR };
u8 result[sizeof(u16)];
struct i2c_msg msg[] = {
{
.addr = ts->client->addr,
.flags = 0,
.buf = cmd,
.len = sizeof(cmd),
}, {
.addr = ts->client->addr,
.flags = I2C_M_RD,
.buf = result,
.len = sizeof(result),
},
};
int ret;
int error;
ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
if (ret != ARRAY_SIZE(msg)) {
error = ret < 0 ? ret : -EIO;
dev_err(&ts->client->dev,
"Failed to retrieve bootloader buffer address: %d\n",
error);
return error;
}
*buf_addr = get_unaligned_le16(result);
dev_dbg(&ts->client->dev,
"Bootloader buffer address %#04x\n", *buf_addr);
return 0;
}
static int mip4_bl_program_page(struct mip4_ts *ts, int offset,
const u8 *data, int length, u16 buf_addr)
{
u8 cmd[6];
u8 *data_buf;
u16 buf_offset;
int ret;
int error;
dev_dbg(&ts->client->dev, "Writing page @%#06x (%d)\n",
offset, length);
if (length > MIP4_BL_PAGE_SIZE || length % MIP4_BL_PACKET_SIZE) {
dev_err(&ts->client->dev,
"Invalid page length: %d\n", length);
return -EINVAL;
}
data_buf = kmalloc(2 + MIP4_BL_PACKET_SIZE, GFP_KERNEL);
if (!data_buf)
return -ENOMEM;
/* Addr */
cmd[0] = MIP4_R0_BOOT;
cmd[1] = MIP4_R1_BOOT_TARGET_ADDR;
put_unaligned_le32(offset, &cmd[2]);
ret = i2c_master_send(ts->client, cmd, 6);
if (ret != 6) {
error = ret < 0 ? ret : -EIO;
dev_err(&ts->client->dev,
"Failed to send write page address: %d\n", error);
goto out;
}
/* Size */
cmd[0] = MIP4_R0_BOOT;
cmd[1] = MIP4_R1_BOOT_SIZE;
put_unaligned_le32(length, &cmd[2]);
ret = i2c_master_send(ts->client, cmd, 6);
if (ret != 6) {
error = ret < 0 ? ret : -EIO;
dev_err(&ts->client->dev,
"Failed to send write page size: %d\n", error);
goto out;
}
/* Data */
for (buf_offset = 0;
buf_offset < length;
buf_offset += MIP4_BL_PACKET_SIZE) {
dev_dbg(&ts->client->dev,
"writing chunk at %#04x (size %d)\n",
buf_offset, MIP4_BL_PACKET_SIZE);
put_unaligned_be16(buf_addr + buf_offset, data_buf);
memcpy(&data_buf[2], &data[buf_offset], MIP4_BL_PACKET_SIZE);
ret = i2c_master_send(ts->client,
data_buf, 2 + MIP4_BL_PACKET_SIZE);
if (ret != 2 + MIP4_BL_PACKET_SIZE) {
error = ret < 0 ? ret : -EIO;
dev_err(&ts->client->dev,
"Failed to read chunk at %#04x (size %d): %d\n",
buf_offset, MIP4_BL_PACKET_SIZE, error);
goto out;
}
}
/* Command */
cmd[0] = MIP4_R0_BOOT;
cmd[1] = MIP4_R1_BOOT_CMD;
cmd[2] = MIP4_BOOT_CMD_PROGRAM;
ret = i2c_master_send(ts->client, cmd, 3);
if (ret != 3) {
error = ret < 0 ? ret : -EIO;
dev_err(&ts->client->dev,
"Failed to send 'write' command: %d\n", error);
goto out;
}
/* Status */
error = mip4_bl_read_status(ts);
out:
kfree(data_buf);
return error ? error : 0;
}
static int mip4_bl_verify_page(struct mip4_ts *ts, int offset,
const u8 *data, int length, int buf_addr)
{
u8 cmd[8];
u8 *read_buf;
int buf_offset;
struct i2c_msg msg[] = {
{
.addr = ts->client->addr,
.flags = 0,
.buf = cmd,
.len = 2,
}, {
.addr = ts->client->addr,
.flags = I2C_M_RD,
.len = MIP4_BL_PACKET_SIZE,
},
};
int ret;
int error;
dev_dbg(&ts->client->dev, "Validating page @%#06x (%d)\n",
offset, length);
/* Addr */
cmd[0] = MIP4_R0_BOOT;
cmd[1] = MIP4_R1_BOOT_TARGET_ADDR;
put_unaligned_le32(offset, &cmd[2]);
ret = i2c_master_send(ts->client, cmd, 6);
if (ret != 6) {
error = ret < 0 ? ret : -EIO;
dev_err(&ts->client->dev,
"Failed to send read page address: %d\n", error);
return error;
}
/* Size */
cmd[0] = MIP4_R0_BOOT;
cmd[1] = MIP4_R1_BOOT_SIZE;
put_unaligned_le32(length, &cmd[2]);
ret = i2c_master_send(ts->client, cmd, 6);
if (ret != 6) {
error = ret < 0 ? ret : -EIO;
dev_err(&ts->client->dev,
"Failed to send read page size: %d\n", error);
return error;
}
/* Command */
cmd[0] = MIP4_R0_BOOT;
cmd[1] = MIP4_R1_BOOT_CMD;
cmd[2] = MIP4_BOOT_CMD_READ;
ret = i2c_master_send(ts->client, cmd, 3);
if (ret != 3) {
error = ret < 0 ? ret : -EIO;
dev_err(&ts->client->dev,
"Failed to send 'read' command: %d\n", error);
return error;
}
/* Status */
error = mip4_bl_read_status(ts);
if (error)
return error;
/* Read */
msg[1].buf = read_buf = kmalloc(MIP4_BL_PACKET_SIZE, GFP_KERNEL);
if (!read_buf)
return -ENOMEM;
for (buf_offset = 0;
buf_offset < length;
buf_offset += MIP4_BL_PACKET_SIZE) {
dev_dbg(&ts->client->dev,
"reading chunk at %#04x (size %d)\n",
buf_offset, MIP4_BL_PACKET_SIZE);
put_unaligned_be16(buf_addr + buf_offset, cmd);
ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
if (ret != ARRAY_SIZE(msg)) {
error = ret < 0 ? ret : -EIO;
dev_err(&ts->client->dev,
"Failed to read chunk at %#04x (size %d): %d\n",
buf_offset, MIP4_BL_PACKET_SIZE, error);
break;
}
if (memcmp(&data[buf_offset], read_buf, MIP4_BL_PACKET_SIZE)) {
dev_err(&ts->client->dev,
"Failed to validate chunk at %#04x (size %d)\n",
buf_offset, MIP4_BL_PACKET_SIZE);
#if MIP4_FW_UPDATE_DEBUG
print_hex_dump(KERN_DEBUG,
MIP4_DEVICE_NAME " F/W File: ",
DUMP_PREFIX_OFFSET, 16, 1,
data + offset, MIP4_BL_PACKET_SIZE,
false);
print_hex_dump(KERN_DEBUG,
MIP4_DEVICE_NAME " F/W Chip: ",
DUMP_PREFIX_OFFSET, 16, 1,
read_buf, MIP4_BL_PAGE_SIZE, false);
#endif
error = -EINVAL;
break;
}
}
kfree(read_buf);
return error ? error : 0;
}
/*
* Flash chip firmware
*/
static int mip4_flash_fw(struct mip4_ts *ts,
const u8 *fw_data, u32 fw_size, u32 fw_offset)
{
struct i2c_client *client = ts->client;
int offset;
u16 buf_addr;
int error, error2;
/* Enter bootloader mode */
dev_dbg(&client->dev, "Entering bootloader mode\n");
error = mip4_bl_enter(ts);
if (error) {
dev_err(&client->dev,
"Failed to enter bootloader mode: %d\n",
error);
return error;
}
/* Read info */
error = mip4_bl_get_address(ts, &buf_addr);
if (error)
goto exit_bl;
/* Program & Verify */
dev_dbg(&client->dev,
"Program & Verify, page size: %d, packet size: %d\n",
MIP4_BL_PAGE_SIZE, MIP4_BL_PACKET_SIZE);
for (offset = fw_offset;
offset < fw_offset + fw_size;
offset += MIP4_BL_PAGE_SIZE) {
/* Program */
error = mip4_bl_program_page(ts, offset, fw_data + offset,
MIP4_BL_PAGE_SIZE, buf_addr);
if (error)
break;
/* Verify */
error = mip4_bl_verify_page(ts, offset, fw_data + offset,
MIP4_BL_PAGE_SIZE, buf_addr);
if (error)
break;
}
exit_bl:
/* Exit bootloader mode */
dev_dbg(&client->dev, "Exiting bootloader mode\n");
error2 = mip4_bl_exit(ts);
if (error2) {
dev_err(&client->dev,
"Failed to exit bootloader mode: %d\n", error2);
if (!error)
error = error2;
}
/* Reset chip */
mip4_power_off(ts);
mip4_power_on(ts);
mip4_query_device(ts);
/* Refresh device parameters */
input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->max_x, 0, 0);
input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0);
input_set_abs_params(ts->input, ABS_X, 0, ts->max_x, 0, 0);
input_set_abs_params(ts->input, ABS_Y, 0, ts->max_y, 0, 0);
input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->ppm_x);
input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->ppm_y);
input_abs_set_res(ts->input, ABS_X, ts->ppm_x);
input_abs_set_res(ts->input, ABS_Y, ts->ppm_y);
return error ? error : 0;
}
static int mip4_parse_firmware(struct mip4_ts *ts, const struct firmware *fw,
u32 *fw_offset_start, u32 *fw_size,
const struct mip4_bin_tail **pfw_info)
{
const struct mip4_bin_tail *fw_info;
struct mip4_fw_version fw_version;
u16 tail_size;
if (fw->size < MIP4_BIN_TAIL_SIZE) {
dev_err(&ts->client->dev,
"Invalid firmware, size mismatch (tail %zd vs %zd)\n",
MIP4_BIN_TAIL_SIZE, fw->size);
return -EINVAL;
}
fw_info = (const void *)&fw->data[fw->size - MIP4_BIN_TAIL_SIZE];
#if MIP4_FW_UPDATE_DEBUG
print_hex_dump(KERN_ERR, MIP4_DEVICE_NAME " Bin Info: ",
DUMP_PREFIX_OFFSET, 16, 1, *fw_info, tail_size, false);
#endif
tail_size = get_unaligned_le16(&fw_info->tail_size);
if (tail_size != MIP4_BIN_TAIL_SIZE) {
dev_err(&ts->client->dev,
"wrong tail size: %d (expected %zd)\n",
tail_size, MIP4_BIN_TAIL_SIZE);
return -EINVAL;
}
/* Check bin format */
if (memcmp(fw_info->tail_mark, MIP4_BIN_TAIL_MARK,
sizeof(fw_info->tail_mark))) {
dev_err(&ts->client->dev,
"unable to locate tail marker (%*ph vs %*ph)\n",
(int)sizeof(fw_info->tail_mark), fw_info->tail_mark,
(int)sizeof(fw_info->tail_mark), MIP4_BIN_TAIL_MARK);
return -EINVAL;
}
*fw_offset_start = get_unaligned_le32(&fw_info->bin_start_addr);
*fw_size = get_unaligned_le32(&fw_info->bin_length);
dev_dbg(&ts->client->dev,
"F/W Data offset: %#08x, size: %d\n",
*fw_offset_start, *fw_size);
if (*fw_size % MIP4_BL_PAGE_SIZE) {
dev_err(&ts->client->dev,
"encoded fw length %d is not multiple of pages (%d)\n",
*fw_size, MIP4_BL_PAGE_SIZE);
return -EINVAL;
}
if (fw->size != *fw_offset_start + *fw_size) {
dev_err(&ts->client->dev,
"Wrong firmware size, expected %d bytes, got %zd\n",
*fw_offset_start + *fw_size, fw->size);
return -EINVAL;
}
mip4_parse_fw_version((const u8 *)&fw_info->ver_boot, &fw_version);
dev_dbg(&ts->client->dev,
"F/W file version %04X %04X %04X %04X\n",
fw_version.boot, fw_version.core,
fw_version.app, fw_version.param);
dev_dbg(&ts->client->dev, "F/W chip version: %04X %04X %04X %04X\n",
ts->fw_version.boot, ts->fw_version.core,
ts->fw_version.app, ts->fw_version.param);
/* Check F/W type */
if (fw_version.boot != 0xEEEE && fw_version.boot != 0xFFFF &&
fw_version.core == 0xEEEE &&
fw_version.app == 0xEEEE &&
fw_version.param == 0xEEEE) {
dev_dbg(&ts->client->dev, "F/W type: Bootloader\n");
} else if (fw_version.boot == 0xEEEE &&
fw_version.core != 0xEEEE && fw_version.core != 0xFFFF &&
fw_version.app != 0xEEEE && fw_version.app != 0xFFFF &&
fw_version.param != 0xEEEE && fw_version.param != 0xFFFF) {
dev_dbg(&ts->client->dev, "F/W type: Main\n");
} else {
dev_err(&ts->client->dev, "Wrong firmware type\n");
return -EINVAL;
}
return 0;
}
static int mip4_execute_fw_update(struct mip4_ts *ts, const struct firmware *fw)
{
const struct mip4_bin_tail *fw_info;
u32 fw_start_offset;
u32 fw_size;
int retires = 3;
int error;
error = mip4_parse_firmware(ts, fw,
&fw_start_offset, &fw_size, &fw_info);
if (error)
return error;
if (input_device_enabled(ts->input)) {
disable_irq(ts->client->irq);
} else {
error = mip4_power_on(ts);
if (error)
return error;
}
/* Update firmware */
do {
error = mip4_flash_fw(ts, fw->data, fw_size, fw_start_offset);
if (!error)
break;
} while (--retires);
if (error)
dev_err(&ts->client->dev,
"Failed to flash firmware: %d\n", error);
/* Enable IRQ */
if (input_device_enabled(ts->input))
enable_irq(ts->client->irq);
else
mip4_power_off(ts);
return error ? error : 0;
}
static ssize_t mip4_sysfs_fw_update(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct mip4_ts *ts = i2c_get_clientdata(client);
const struct firmware *fw;
int error;
error = request_firmware(&fw, ts->fw_name, dev);
if (error) {
dev_err(&ts->client->dev,
"Failed to retrieve firmware %s: %d\n",
ts->fw_name, error);
return error;
}
/*
* Take input mutex to prevent racing with itself and also with
* userspace opening and closing the device and also suspend/resume
* transitions.
*/
mutex_lock(&ts->input->mutex);
error = mip4_execute_fw_update(ts, fw);
mutex_unlock(&ts->input->mutex);
release_firmware(fw);
if (error) {
dev_err(&ts->client->dev,
"Firmware update failed: %d\n", error);
return error;
}
return count;
}
static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mip4_sysfs_fw_update);
static ssize_t mip4_sysfs_read_fw_version(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct mip4_ts *ts = i2c_get_clientdata(client);
size_t count;
/* Take lock to prevent racing with firmware update */
mutex_lock(&ts->input->mutex);
count = sysfs_emit(buf, "%04X %04X %04X %04X\n",
ts->fw_version.boot, ts->fw_version.core,
ts->fw_version.app, ts->fw_version.param);
mutex_unlock(&ts->input->mutex);
return count;
}
static DEVICE_ATTR(fw_version, S_IRUGO, mip4_sysfs_read_fw_version, NULL);
static ssize_t mip4_sysfs_read_hw_version(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct mip4_ts *ts = i2c_get_clientdata(client);
size_t count;
/* Take lock to prevent racing with firmware update */
mutex_lock(&ts->input->mutex);
/*
* product_name shows the name or version of the hardware
* paired with current firmware in the chip.
*/
count = sysfs_emit(buf, "%.*s\n",
(int)sizeof(ts->product_name), ts->product_name);
mutex_unlock(&ts->input->mutex);
return count;
}
static DEVICE_ATTR(hw_version, S_IRUGO, mip4_sysfs_read_hw_version, NULL);
static ssize_t mip4_sysfs_read_product_id(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct mip4_ts *ts = i2c_get_clientdata(client);
size_t count;
mutex_lock(&ts->input->mutex);
count = sysfs_emit(buf, "%04X\n", ts->product_id);
mutex_unlock(&ts->input->mutex);
return count;
}
static DEVICE_ATTR(product_id, S_IRUGO, mip4_sysfs_read_product_id, NULL);
static ssize_t mip4_sysfs_read_ic_name(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct mip4_ts *ts = i2c_get_clientdata(client);
size_t count;
mutex_lock(&ts->input->mutex);
count = sysfs_emit(buf, "%.*s\n",
(int)sizeof(ts->ic_name), ts->ic_name);
mutex_unlock(&ts->input->mutex);
return count;
}
static DEVICE_ATTR(ic_name, S_IRUGO, mip4_sysfs_read_ic_name, NULL);
static struct attribute *mip4_attrs[] = {
&dev_attr_fw_version.attr,
&dev_attr_hw_version.attr,
&dev_attr_product_id.attr,
&dev_attr_ic_name.attr,
&dev_attr_update_fw.attr,
NULL,
};
ATTRIBUTE_GROUPS(mip4);
static int mip4_probe(struct i2c_client *client)
{
struct mip4_ts *ts;
struct input_dev *input;
int error;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev, "Not supported I2C adapter\n");
return -ENXIO;
}
ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
if (!ts)
return -ENOMEM;
input = devm_input_allocate_device(&client->dev);
if (!input)
return -ENOMEM;
ts->client = client;
ts->input = input;
snprintf(ts->phys, sizeof(ts->phys),
"%s/input0", dev_name(&client->dev));
ts->gpio_ce = devm_gpiod_get_optional(&client->dev,
"ce", GPIOD_OUT_LOW);
if (IS_ERR(ts->gpio_ce))
return dev_err_probe(&client->dev, PTR_ERR(ts->gpio_ce), "Failed to get gpio\n");
error = mip4_power_on(ts);
if (error)
return error;
error = mip4_query_device(ts);
mip4_power_off(ts);
if (error)
return error;
input->name = "MELFAS MIP4 Touchscreen";
input->phys = ts->phys;
input->id.bustype = BUS_I2C;
input->id.vendor = 0x13c5;
input->id.product = ts->product_id;
input->open = mip4_input_open;
input->close = mip4_input_close;
input_set_drvdata(input, ts);
input->keycode = ts->key_code;
input->keycodesize = sizeof(*ts->key_code);
input->keycodemax = ts->key_num;
input_set_abs_params(input, ABS_MT_TOOL_TYPE, 0, MT_TOOL_PALM, 0, 0);
input_set_abs_params(input, ABS_MT_POSITION_X, 0, ts->max_x, 0, 0);
input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0);
input_set_abs_params(input, ABS_MT_PRESSURE,
MIP4_PRESSURE_MIN, MIP4_PRESSURE_MAX, 0, 0);
input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
MIP4_TOUCH_MAJOR_MIN, MIP4_TOUCH_MAJOR_MAX, 0, 0);
input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
MIP4_TOUCH_MINOR_MIN, MIP4_TOUCH_MINOR_MAX, 0, 0);
input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->ppm_x);
input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->ppm_y);
error = input_mt_init_slots(input, MIP4_MAX_FINGERS, INPUT_MT_DIRECT);
if (error)
return error;
i2c_set_clientdata(client, ts);
error = devm_request_threaded_irq(&client->dev, client->irq,
NULL, mip4_interrupt,
IRQF_ONESHOT | IRQF_NO_AUTOEN,
MIP4_DEVICE_NAME, ts);
if (error) {
dev_err(&client->dev,
"Failed to request interrupt %d: %d\n",
client->irq, error);
return error;
}
error = input_register_device(input);
if (error) {
dev_err(&client->dev,
"Failed to register input device: %d\n", error);
return error;
}
return 0;
}
static int mip4_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct mip4_ts *ts = i2c_get_clientdata(client);
struct input_dev *input = ts->input;
mutex_lock(&input->mutex);
if (device_may_wakeup(dev))
ts->wake_irq_enabled = enable_irq_wake(client->irq) == 0;
else if (input_device_enabled(input))
mip4_disable(ts);
mutex_unlock(&input->mutex);
return 0;
}
static int mip4_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct mip4_ts *ts = i2c_get_clientdata(client);
struct input_dev *input = ts->input;
mutex_lock(&input->mutex);
if (ts->wake_irq_enabled)
disable_irq_wake(client->irq);
else if (input_device_enabled(input))
mip4_enable(ts);
mutex_unlock(&input->mutex);
return 0;
}
static DEFINE_SIMPLE_DEV_PM_OPS(mip4_pm_ops, mip4_suspend, mip4_resume);
#ifdef CONFIG_OF
static const struct of_device_id mip4_of_match[] = {
{ .compatible = "melfas,"MIP4_DEVICE_NAME, },
{ },
};
MODULE_DEVICE_TABLE(of, mip4_of_match);
#endif
#ifdef CONFIG_ACPI
static const struct acpi_device_id mip4_acpi_match[] = {
{ "MLFS0000", 0},
{ },
};
MODULE_DEVICE_TABLE(acpi, mip4_acpi_match);
#endif
static const struct i2c_device_id mip4_i2c_ids[] = {
{ MIP4_DEVICE_NAME },
{ }
};
MODULE_DEVICE_TABLE(i2c, mip4_i2c_ids);
static struct i2c_driver mip4_driver = {
.id_table = mip4_i2c_ids,
.probe = mip4_probe,
.driver = {
.name = MIP4_DEVICE_NAME,
.dev_groups = mip4_groups,
.of_match_table = of_match_ptr(mip4_of_match),
.acpi_match_table = ACPI_PTR(mip4_acpi_match),
.pm = pm_sleep_ptr(&mip4_pm_ops),
},
};
module_i2c_driver(mip4_driver);
MODULE_DESCRIPTION("MELFAS MIP4 Touchscreen");
MODULE_AUTHOR("Sangwon Jee <[email protected]>");
MODULE_LICENSE("GPL");
Codebase Browser
linux