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melfas_mip4.c
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melfas_mip4.c
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/*
* MELFAS MIP4 Touchscreen
*
* Copyright (C) 2016 MELFAS Inc.
*
* Author : Sangwon Jee <jeesw@melfas.com>
*
* 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.
*/
#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 <asm/unaligned.h>
#define MIP4_DEVICE_NAME "mip4_ts"
/*****************************************************************
* Protocol
* Version : MIP 4.0 Rev 4.6
*****************************************************************/
/* 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_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];
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)
{
int error;
u8 cmd[2];
u8 buf[14];
/* 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);
/* 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_state(ts->input, MT_TOOL_FINGER, 0);
}
/* 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 hover;
bool palm;
bool state;
u16 x, y;
u8 pressure_stage = 0;
u8 pressure;
u8 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);
} else if (state) {
/* Press or Move event */
input_mt_slot(ts->input, id);
input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true);
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);
} else {
/* Release event */
input_mt_slot(ts->input, id);
input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, 0);
}
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;