// SPDX-License-Identifier: GPL-2.0-only
/*
* Raydium touchscreen I2C driver.
*
* Copyright (C) 2012-2014, Raydium Semiconductor Corporation.
*
* Raydium reserves the right to make changes without further notice
* to the materials described herein. Raydium does not assume any
* liability arising out of the application described herein.
*
* Contact Raydium Semiconductor Corporation at www.rad-ic.com
*/
#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/pm_wakeirq.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/unaligned.h>
/* Slave I2C mode */
#define RM_BOOT_BLDR 0x02
#define RM_BOOT_MAIN 0x03
/* I2C bootoloader commands */
#define RM_CMD_BOOT_PAGE_WRT 0x0B /* send bl page write */
#define RM_CMD_BOOT_WRT 0x11 /* send bl write */
#define RM_CMD_BOOT_ACK 0x22 /* send ack*/
#define RM_CMD_BOOT_CHK 0x33 /* send data check */
#define RM_CMD_BOOT_READ 0x44 /* send wait bl data ready*/
#define RM_BOOT_RDY 0xFF /* bl data ready */
#define RM_BOOT_CMD_READHWID 0x0E /* read hwid */
/* I2C main commands */
#define RM_CMD_QUERY_BANK 0x2B
#define RM_CMD_DATA_BANK 0x4D
#define RM_CMD_ENTER_SLEEP 0x4E
#define RM_CMD_BANK_SWITCH 0xAA
#define RM_RESET_MSG_ADDR 0x40000004
#define RM_MAX_READ_SIZE 56
#define RM_PACKET_CRC_SIZE 2
/* Touch relative info */
#define RM_MAX_RETRIES 3
#define RM_RETRY_DELAY_MS 20
#define RM_MAX_TOUCH_NUM 10
#define RM_BOOT_DELAY_MS 100
/* Offsets in contact data */
#define RM_CONTACT_STATE_POS 0
#define RM_CONTACT_X_POS 1
#define RM_CONTACT_Y_POS 3
#define RM_CONTACT_PRESSURE_POS 5
#define RM_CONTACT_WIDTH_X_POS 6
#define RM_CONTACT_WIDTH_Y_POS 7
/* Bootloader relative info */
#define RM_BL_WRT_CMD_SIZE 3 /* bl flash wrt cmd size */
#define RM_BL_WRT_PKG_SIZE 32 /* bl wrt pkg size */
#define RM_BL_WRT_LEN (RM_BL_WRT_PKG_SIZE + RM_BL_WRT_CMD_SIZE)
#define RM_FW_PAGE_SIZE 128
#define RM_MAX_FW_RETRIES 30
#define RM_MAX_FW_SIZE 0xD000
#define RM_POWERON_DELAY_USEC 500
#define RM_RESET_DELAY_MSEC 50
enum raydium_bl_cmd {
BL_HEADER = 0,
BL_PAGE_STR,
BL_PKG_IDX,
BL_DATA_STR,
};
enum raydium_bl_ack {
RAYDIUM_ACK_NULL = 0,
RAYDIUM_WAIT_READY,
RAYDIUM_PATH_READY,
};
enum raydium_boot_mode {
RAYDIUM_TS_MAIN = 0,
RAYDIUM_TS_BLDR,
};
/* Response to RM_CMD_DATA_BANK request */
struct raydium_data_info {
__le32 data_bank_addr;
u8 pkg_size;
u8 tp_info_size;
};
struct raydium_info {
__le32 hw_ver; /*device version */
u8 main_ver;
u8 sub_ver;
__le16 ft_ver; /* test version */
u8 x_num;
u8 y_num;
__le16 x_max;
__le16 y_max;
u8 x_res; /* units/mm */
u8 y_res; /* units/mm */
};
/* struct raydium_data - represents state of Raydium touchscreen device */
struct raydium_data {
struct i2c_client *client;
struct input_dev *input;
struct regulator *avdd;
struct regulator *vccio;
struct gpio_desc *reset_gpio;
struct raydium_info info;
struct mutex sysfs_mutex;
u8 *report_data;
u32 data_bank_addr;
u8 report_size;
u8 contact_size;
u8 pkg_size;
enum raydium_boot_mode boot_mode;
};
/*
* Header to be sent for RM_CMD_BANK_SWITCH command. This is used by
* raydium_i2c_{read|send} below.
*/
struct __packed raydium_bank_switch_header {
u8 cmd;
__be32 be_addr;
};
static int raydium_i2c_xfer(struct i2c_client *client, u32 addr,
struct i2c_msg *xfer, size_t xfer_count)
{
int ret;
/*
* If address is greater than 255, then RM_CMD_BANK_SWITCH needs to be
* sent first. Else, skip the header i.e. xfer[0].
*/
int xfer_start_idx = (addr > 0xff) ? 0 : 1;
xfer_count -= xfer_start_idx;
ret = i2c_transfer(client->adapter, &xfer[xfer_start_idx], xfer_count);
if (likely(ret == xfer_count))
return 0;
return ret < 0 ? ret : -EIO;
}
static int raydium_i2c_send(struct i2c_client *client,
u32 addr, const void *data, size_t len)
{
int tries = 0;
int error;
u8 *tx_buf;
u8 reg_addr = addr & 0xff;
tx_buf = kmalloc(len + 1, GFP_KERNEL);
if (!tx_buf)
return -ENOMEM;
tx_buf[0] = reg_addr;
memcpy(tx_buf + 1, data, len);
do {
struct raydium_bank_switch_header header = {
.cmd = RM_CMD_BANK_SWITCH,
.be_addr = cpu_to_be32(addr),
};
/*
* Perform as a single i2c_transfer transaction to ensure that
* no other I2C transactions are initiated on the bus to any
* other device in between. Initiating transacations to other
* devices after RM_CMD_BANK_SWITCH is sent is known to cause
* issues. This is also why regmap infrastructure cannot be used
* for this driver. Regmap handles page(bank) switch and reads
* as separate i2c_transfer() operations. This can result in
* problems if the Raydium device is on a shared I2C bus.
*/
struct i2c_msg xfer[] = {
{
.addr = client->addr,
.len = sizeof(header),
.buf = (u8 *)&header,
},
{
.addr = client->addr,
.len = len + 1,
.buf = tx_buf,
},
};
error = raydium_i2c_xfer(client, addr, xfer, ARRAY_SIZE(xfer));
if (likely(!error))
goto out;
msleep(RM_RETRY_DELAY_MS);
} while (++tries < RM_MAX_RETRIES);
dev_err(&client->dev, "%s failed: %d\n", __func__, error);
out:
kfree(tx_buf);
return error;
}
static int raydium_i2c_read(struct i2c_client *client,
u32 addr, void *data, size_t len)
{
int error;
while (len) {
u8 reg_addr = addr & 0xff;
struct raydium_bank_switch_header header = {
.cmd = RM_CMD_BANK_SWITCH,
.be_addr = cpu_to_be32(addr),
};
size_t xfer_len = min_t(size_t, len, RM_MAX_READ_SIZE);
/*
* Perform as a single i2c_transfer transaction to ensure that
* no other I2C transactions are initiated on the bus to any
* other device in between. Initiating transacations to other
* devices after RM_CMD_BANK_SWITCH is sent is known to cause
* issues. This is also why regmap infrastructure cannot be used
* for this driver. Regmap handles page(bank) switch and writes
* as separate i2c_transfer() operations. This can result in
* problems if the Raydium device is on a shared I2C bus.
*/
struct i2c_msg xfer[] = {
{
.addr = client->addr,
.len = sizeof(header),
.buf = (u8 *)&header,
},
{
.addr = client->addr,
.len = 1,
.buf = ®_addr,
},
{
.addr = client->addr,
.len = xfer_len,
.buf = data,
.flags = I2C_M_RD,
}
};
error = raydium_i2c_xfer(client, addr, xfer, ARRAY_SIZE(xfer));
if (unlikely(error))
return error;
len -= xfer_len;
data += xfer_len;
addr += xfer_len;
}
return 0;
}
static int raydium_i2c_sw_reset(struct i2c_client *client)
{
const u8 soft_rst_cmd = 0x01;
int error;
error = raydium_i2c_send(client, RM_RESET_MSG_ADDR, &soft_rst_cmd,
sizeof(soft_rst_cmd));
if (error) {
dev_err(&client->dev, "software reset failed: %d\n", error);
return error;
}
msleep(RM_RESET_DELAY_MSEC);
return 0;
}
static int raydium_i2c_query_ts_bootloader_info(struct raydium_data *ts)
{
struct i2c_client *client = ts->client;
static const u8 get_hwid[] = { RM_BOOT_CMD_READHWID,
0x10, 0xc0, 0x01, 0x00, 0x04, 0x00 };
u8 rbuf[5] = { 0 };
u32 hw_ver;
int error;
error = raydium_i2c_send(client, RM_CMD_BOOT_WRT,
get_hwid, sizeof(get_hwid));
if (error) {
dev_err(&client->dev, "WRT HWID command failed: %d\n", error);
return error;
}
error = raydium_i2c_send(client, RM_CMD_BOOT_ACK, rbuf, 1);
if (error) {
dev_err(&client->dev, "Ack HWID command failed: %d\n", error);
return error;
}
error = raydium_i2c_read(client, RM_CMD_BOOT_CHK, rbuf, sizeof(rbuf));
if (error) {
dev_err(&client->dev, "Read HWID command failed: %d (%4ph)\n",
error, rbuf + 1);
hw_ver = 0xffffffffUL;
} else {
hw_ver = get_unaligned_be32(rbuf + 1);
}
ts->info.hw_ver = cpu_to_le32(hw_ver);
ts->info.main_ver = 0xff;
ts->info.sub_ver = 0xff;
return error;
}
static int raydium_i2c_query_ts_info(struct raydium_data *ts)
{
struct i2c_client *client = ts->client;
struct raydium_data_info data_info;
__le32 query_bank_addr;
int error, retry_cnt;
for (retry_cnt = 0; retry_cnt < RM_MAX_RETRIES; retry_cnt++) {
error = raydium_i2c_read(client, RM_CMD_DATA_BANK,
&data_info, sizeof(data_info));
if (error)
continue;
/*
* Warn user if we already allocated memory for reports and
* then the size changed (due to firmware update?) and keep
* old size instead.
*/
if (ts->report_data && ts->pkg_size != data_info.pkg_size) {
dev_warn(&client->dev,
"report size changes, was: %d, new: %d\n",
ts->pkg_size, data_info.pkg_size);
} else {
ts->pkg_size = data_info.pkg_size;
ts->report_size = ts->pkg_size - RM_PACKET_CRC_SIZE;
}
ts->contact_size = data_info.tp_info_size;
ts->data_bank_addr = le32_to_cpu(data_info.data_bank_addr);
dev_dbg(&client->dev,
"data_bank_addr: %#08x, report_size: %d, contact_size: %d\n",
ts->data_bank_addr, ts->report_size, ts->contact_size);
error = raydium_i2c_read(client, RM_CMD_QUERY_BANK,
&query_bank_addr,
sizeof(query_bank_addr));
if (error)
continue;
error = raydium_i2c_read(client, le32_to_cpu(query_bank_addr),
&ts->info, sizeof(ts->info));
if (error)
continue;
return 0;
}
dev_err(&client->dev, "failed to query device parameters: %d\n", error);
return error;
}
static int raydium_i2c_check_fw_status(struct raydium_data *ts)
{
struct i2c_client *client = ts->client;
static const u8 bl_ack = 0x62;
static const u8 main_ack = 0x66;
u8 buf[4];
int error;
error = raydium_i2c_read(client, RM_CMD_BOOT_READ, buf, sizeof(buf));
if (!error) {
if (buf[0] == bl_ack)
ts->boot_mode = RAYDIUM_TS_BLDR;
else if (buf[0] == main_ack)
ts->boot_mode = RAYDIUM_TS_MAIN;
return 0;
}
return error;
}
static int raydium_i2c_initialize(struct raydium_data *ts)
{
struct i2c_client *client = ts->client;
int error, retry_cnt;
for (retry_cnt = 0; retry_cnt < RM_MAX_RETRIES; retry_cnt++) {
/* Wait for Hello packet */
msleep(RM_BOOT_DELAY_MS);
error = raydium_i2c_check_fw_status(ts);
if (error) {
dev_err(&client->dev,
"failed to read 'hello' packet: %d\n", error);
continue;
}
if (ts->boot_mode == RAYDIUM_TS_BLDR ||
ts->boot_mode == RAYDIUM_TS_MAIN) {
break;
}
}
if (error)
ts->boot_mode = RAYDIUM_TS_BLDR;
if (ts->boot_mode == RAYDIUM_TS_BLDR)
raydium_i2c_query_ts_bootloader_info(ts);
else
raydium_i2c_query_ts_info(ts);
return error;
}
static int raydium_i2c_bl_chk_state(struct i2c_client *client,
enum raydium_bl_ack state)
{
static const u8 ack_ok[] = { 0xFF, 0x39, 0x30, 0x30, 0x54 };
u8 rbuf[sizeof(ack_ok)];
u8 retry;
int error;
for (retry = 0; retry < RM_MAX_FW_RETRIES; retry++) {
switch (state) {
case RAYDIUM_ACK_NULL:
return 0;
case RAYDIUM_WAIT_READY:
error = raydium_i2c_read(client, RM_CMD_BOOT_CHK,
&rbuf[0], 1);
if (!error && rbuf[0] == RM_BOOT_RDY)
return 0;
break;
case RAYDIUM_PATH_READY:
error = raydium_i2c_read(client, RM_CMD_BOOT_CHK,
rbuf, sizeof(rbuf));
if (!error && !memcmp(rbuf, ack_ok, sizeof(ack_ok)))
return 0;
break;
default:
dev_err(&client->dev, "%s: invalid target state %d\n",
__func__, state);
return -EINVAL;
}
msleep(20);
}
return -ETIMEDOUT;
}
static int raydium_i2c_write_object(struct i2c_client *client,
const void *data, size_t len,
enum raydium_bl_ack state)
{
int error;
static const u8 cmd[] = { 0xFF, 0x39 };
error = raydium_i2c_send(client, RM_CMD_BOOT_WRT, data, len);
if (error) {
dev_err(&client->dev, "WRT obj command failed: %d\n",
error);
return error;
}
error = raydium_i2c_send(client, RM_CMD_BOOT_ACK, cmd, sizeof(cmd));
if (error) {
dev_err(&client->dev, "Ack obj command failed: %d\n", error);
return error;
}
error = raydium_i2c_bl_chk_state(client, state);
if (error) {
dev_err(&client->dev, "BL check state failed: %d\n", error);
return error;
}
return 0;
}
static int raydium_i2c_boot_trigger(struct i2c_client *client)
{
static const u8 cmd[7][6] = {
{ 0x08, 0x0C, 0x09, 0x00, 0x50, 0xD7 },
{ 0x08, 0x04, 0x09, 0x00, 0x50, 0xA5 },
{ 0x08, 0x04, 0x09, 0x00, 0x50, 0x00 },
{ 0x08, 0x04, 0x09, 0x00, 0x50, 0xA5 },
{ 0x08, 0x0C, 0x09, 0x00, 0x50, 0x00 },
{ 0x06, 0x01, 0x00, 0x00, 0x00, 0x00 },
{ 0x02, 0xA2, 0x00, 0x00, 0x00, 0x00 },
};
int i;
int error;
for (i = 0; i < 7; i++) {
error = raydium_i2c_write_object(client, cmd[i], sizeof(cmd[i]),
RAYDIUM_WAIT_READY);
if (error) {
dev_err(&client->dev,
"boot trigger failed at step %d: %d\n",
i, error);
return error;
}
}
return 0;
}
static int raydium_i2c_fw_trigger(struct i2c_client *client)
{
static const u8 cmd[5][11] = {
{ 0, 0x09, 0x71, 0x0C, 0x09, 0x00, 0x50, 0xD7, 0, 0, 0 },
{ 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0xA5, 0, 0, 0 },
{ 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0x00, 0, 0, 0 },
{ 0, 0x09, 0x71, 0x04, 0x09, 0x00, 0x50, 0xA5, 0, 0, 0 },
{ 0, 0x09, 0x71, 0x0C, 0x09, 0x00, 0x50, 0x00, 0, 0, 0 },
};
int i;
int error;
for (i = 0; i < 5; i++) {
error = raydium_i2c_write_object(client, cmd[i], sizeof(cmd[i]),
RAYDIUM_ACK_NULL);
if (error) {
dev_err(&client->dev,
"fw trigger failed at step %d: %d\n",
i, error);
return error;
}
}
return 0;
}
static int raydium_i2c_check_path(struct i2c_client *client)
{
static const u8 cmd[] = { 0x09, 0x00, 0x09, 0x00, 0x50, 0x10, 0x00 };
int error;
error = raydium_i2c_write_object(client, cmd, sizeof(cmd),
RAYDIUM_PATH_READY);
if (error) {
dev_err(&client->dev, "check path command failed: %d\n", error);
return error;
}
return 0;
}
static int raydium_i2c_enter_bl(struct i2c_client *client)
{
static const u8 cal_cmd[] = { 0x00, 0x01, 0x52 };
int error;
error = raydium_i2c_write_object(client, cal_cmd, sizeof(cal_cmd),
RAYDIUM_ACK_NULL);
if (error) {
dev_err(&client->dev, "enter bl command failed: %d\n", error);
return error;
}
msleep(RM_BOOT_DELAY_MS);
return 0;
}
static int raydium_i2c_leave_bl(struct i2c_client *client)
{
static const u8 leave_cmd[] = { 0x05, 0x00 };
int error;
error = raydium_i2c_write_object(client, leave_cmd, sizeof(leave_cmd),
RAYDIUM_ACK_NULL);
if (error) {
dev_err(&client->dev, "leave bl command failed: %d\n", error);
return error;
}
msleep(RM_BOOT_DELAY_MS);
return 0;
}
static int raydium_i2c_write_checksum(struct i2c_client *client,
size_t length, u16 checksum)
{
u8 checksum_cmd[] = { 0x00, 0x05, 0x6D, 0x00, 0x00, 0x00, 0x00 };
int error;
put_unaligned_le16(length, &checksum_cmd[3]);
put_unaligned_le16(checksum, &checksum_cmd[5]);
error = raydium_i2c_write_object(client,
checksum_cmd, sizeof(checksum_cmd),
RAYDIUM_ACK_NULL);
if (error) {
dev_err(&client->dev, "failed to write checksum: %d\n",
error);
return error;
}
return 0;
}
static int raydium_i2c_disable_watch_dog(struct i2c_client *client)
{
static const u8 cmd[] = { 0x0A, 0xAA };
int error;
error = raydium_i2c_write_object(client, cmd, sizeof(cmd),
RAYDIUM_WAIT_READY);
if (error) {
dev_err(&client->dev, "disable watchdog command failed: %d\n",
error);
return error;
}
return 0;
}
static int raydium_i2c_fw_write_page(struct i2c_client *client,
u16 page_idx, const void *data, size_t len)
{
u8 buf[RM_BL_WRT_LEN];
size_t xfer_len;
int error;
int i;
BUILD_BUG_ON((RM_FW_PAGE_SIZE % RM_BL_WRT_PKG_SIZE) != 0);
for (i = 0; i < RM_FW_PAGE_SIZE / RM_BL_WRT_PKG_SIZE; i++) {
buf[BL_HEADER] = RM_CMD_BOOT_PAGE_WRT;
buf[BL_PAGE_STR] = page_idx ? 0xff : 0;
buf[BL_PKG_IDX] = i + 1;
xfer_len = min_t(size_t, len, RM_BL_WRT_PKG_SIZE);
memcpy(&buf[BL_DATA_STR], data, xfer_len);
if (len < RM_BL_WRT_PKG_SIZE)
memset(&buf[BL_DATA_STR + xfer_len], 0xff,
RM_BL_WRT_PKG_SIZE - xfer_len);
error = raydium_i2c_write_object(client, buf, RM_BL_WRT_LEN,
RAYDIUM_WAIT_READY);
if (error) {
dev_err(&client->dev,
"page write command failed for page %d, chunk %d: %d\n",
page_idx, i, error);
return error;
}
data += xfer_len;
len -= xfer_len;
}
return error;
}
static u16 raydium_calc_chksum(const u8 *buf, u16 len)
{
u16 checksum = 0;
u16 i;
for (i = 0; i < len; i++)
checksum += buf[i];
return checksum;
}
static int raydium_i2c_do_update_firmware(struct raydium_data *ts,
const struct firmware *fw)
{
struct i2c_client *client = ts->client;
const void *data;
size_t data_len;
size_t len;
int page_nr;
int i;
int error;
u16 fw_checksum;
if (fw->size == 0 || fw->size > RM_MAX_FW_SIZE) {
dev_err(&client->dev, "Invalid firmware length\n");
return -EINVAL;
}
error = raydium_i2c_check_fw_status(ts);
if (error) {
dev_err(&client->dev, "Unable to access IC %d\n", error);
return error;
}
if (ts->boot_mode == RAYDIUM_TS_MAIN) {
for (i = 0; i < RM_MAX_RETRIES; i++) {
error = raydium_i2c_enter_bl(client);
if (!error) {
error = raydium_i2c_check_fw_status(ts);
if (error) {
dev_err(&client->dev,
"unable to access IC: %d\n",
error);
return error;
}
if (ts->boot_mode == RAYDIUM_TS_BLDR)
break;
}
}
if (ts->boot_mode == RAYDIUM_TS_MAIN) {
dev_err(&client->dev,
"failed to jump to boot loader: %d\n",
error);
return -EIO;
}
}
error = raydium_i2c_disable_watch_dog(client);
if (error)
return error;
error = raydium_i2c_check_path(client);
if (error)
return error;
error = raydium_i2c_boot_trigger(client);
if (error) {
dev_err(&client->dev, "send boot trigger fail: %d\n", error);
return error;
}
msleep(RM_BOOT_DELAY_MS);
data = fw->data;
data_len = fw->size;
page_nr = 0;
while (data_len) {
len = min_t(size_t, data_len, RM_FW_PAGE_SIZE);
error = raydium_i2c_fw_write_page(client, page_nr++, data, len);
if (error)
return error;
msleep(20);
data += len;
data_len -= len;
}
error = raydium_i2c_leave_bl(client);
if (error) {
dev_err(&client->dev,
"failed to leave boot loader: %d\n", error);
return error;
}
dev_dbg(&client->dev, "left boot loader mode\n");
msleep(RM_BOOT_DELAY_MS);
error = raydium_i2c_check_fw_status(ts);
if (error) {
dev_err(&client->dev,
"failed to check fw status after write: %d\n",
error);
return error;
}
if (ts->boot_mode != RAYDIUM_TS_MAIN) {
dev_err(&client->dev,
"failed to switch to main fw after writing firmware: %d\n",
error);
return -EINVAL;
}
error = raydium_i2c_fw_trigger(client);
if (error) {
dev_err(&client->dev, "failed to trigger fw: %d\n", error);
return error;
}
fw_checksum = raydium_calc_chksum(fw->data, fw->size);
error = raydium_i2c_write_checksum(client, fw->size, fw_checksum);
if (error)
return error;
return 0;
}
static int raydium_i2c_fw_update(struct raydium_data *ts)
{
struct i2c_client *client = ts->client;
const struct firmware *fw = NULL;
char *fw_file;
int error;
fw_file = kasprintf(GFP_KERNEL, "raydium_%#04x.fw",
le32_to_cpu(ts->info.hw_ver));
if (!fw_file)
return -ENOMEM;
dev_dbg(&client->dev, "firmware name: %s\n", fw_file);
error = request_firmware(&fw, fw_file, &client->dev);
if (error) {
dev_err(&client->dev, "Unable to open firmware %s\n", fw_file);
goto out_free_fw_file;
}
disable_irq(client->irq);
error = raydium_i2c_do_update_firmware(ts, fw);
if (error) {
dev_err(&client->dev, "firmware update failed: %d\n", error);
ts->boot_mode = RAYDIUM_TS_BLDR;
goto out_enable_irq;
}
error = raydium_i2c_initialize(ts);
if (error) {
dev_err(&client->dev,
"failed to initialize device after firmware update: %d\n",
error);
ts->boot_mode = RAYDIUM_TS_BLDR;
goto out_enable_irq;
}
ts->boot_mode = RAYDIUM_TS_MAIN;
out_enable_irq:
enable_irq(client->irq);
msleep(100);
release_firmware(fw);
out_free_fw_file:
kfree(fw_file);
return error;
}
static void raydium_mt_event(struct raydium_data *ts)
{
int i;
for (i = 0; i < ts->report_size / ts->contact_size; i++) {
u8 *contact = &ts->report_data[ts->contact_size * i];
bool state = contact[RM_CONTACT_STATE_POS];
u8 wx, wy;
input_mt_slot(ts->input, i);
input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, state);
if (!state)
continue;
input_report_abs(ts->input, ABS_MT_POSITION_X,
get_unaligned_le16(&contact[RM_CONTACT_X_POS]));
input_report_abs(ts->input, ABS_MT_POSITION_Y,
get_unaligned_le16(&contact[RM_CONTACT_Y_POS]));
input_report_abs(ts->input, ABS_MT_PRESSURE,
contact[RM_CONTACT_PRESSURE_POS]);
wx = contact[RM_CONTACT_WIDTH_X_POS];
wy = contact[RM_CONTACT_WIDTH_Y_POS];
input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, max(wx, wy));
input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, min(wx, wy));
}
input_mt_sync_frame(ts->input);
input_sync(ts->input);
}
static irqreturn_t raydium_i2c_irq(int irq, void *_dev)
{
struct raydium_data *ts = _dev;
int error;
u16 fw_crc;
u16 calc_crc;
if (ts->boot_mode != RAYDIUM_TS_MAIN)
goto out;
error = raydium_i2c_read(ts->client, ts->data_bank_addr,
ts->report_data, ts->pkg_size);
if (error)
goto out;
fw_crc = get_unaligned_le16(&ts->report_data[ts->report_size]);
calc_crc = raydium_calc_chksum(ts->report_data, ts->report_size);
if (unlikely(fw_crc != calc_crc)) {
dev_warn(&ts->client->dev,
"%s: invalid packet crc %#04x vs %#04x\n",
__func__, calc_crc, fw_crc);
goto out;
}
raydium_mt_event(ts);
out:
return IRQ_HANDLED;
}
static ssize_t raydium_i2c_fw_ver_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct raydium_data *ts = i2c_get_clientdata(client);
return sprintf(buf, "%d.%d\n", ts->info.main_ver, ts->info.sub_ver);
}
static ssize_t raydium_i2c_hw_ver_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct raydium_data *ts = i2c_get_clientdata(client);
return sprintf(buf, "%#04x\n", le32_to_cpu(ts->info.hw_ver));
}
static ssize_t raydium_i2c_boot_mode_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct raydium_data *ts = i2c_get_clientdata(client);
return sprintf(buf, "%s\n",
ts->boot_mode == RAYDIUM_TS_MAIN ?
"Normal" : "Recovery");
}
static ssize_t raydium_i2c_update_fw_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct raydium_data *ts = i2c_get_clientdata(client);
int error;
error = mutex_lock_interruptible(&ts->sysfs_mutex);
if (error)
return error;
error = raydium_i2c_fw_update(ts);
mutex_unlock(&ts->sysfs_mutex);
return error ?: count;
}
static ssize_t raydium_i2c_calibrate_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct raydium_data *ts = i2c_get_clientdata(client);
static const u8 cal_cmd[] = { 0x00, 0x01, 0x9E };
int error;
error = mutex_lock_interruptible(&ts->sysfs_mutex);
if (error)
return error;
error = raydium_i2c_write_object(client, cal_cmd, sizeof(cal_cmd),
RAYDIUM_WAIT_READY);
if (error)
dev_err(&client->dev, "calibrate command failed: %d\n", error);
mutex_unlock(&ts->sysfs_mutex);
return error ?: count;
}
static DEVICE_ATTR(fw_version, S_IRUGO, raydium_i2c_fw_ver_show, NULL);
static DEVICE_ATTR(hw_version, S_IRUGO, raydium_i2c_hw_ver_show, NULL);
static DEVICE_ATTR(boot_mode, S_IRUGO, raydium_i2c_boot_mode_show, NULL);
static DEVICE_ATTR(update_fw, S_IWUSR, NULL, raydium_i2c_update_fw_store);
static DEVICE_ATTR(calibrate, S_IWUSR, NULL, raydium_i2c_calibrate_store);
static struct attribute *raydium_i2c_attrs[] = {
&dev_attr_update_fw.attr,
&dev_attr_boot_mode.attr,
&dev_attr_fw_version.attr,
&dev_attr_hw_version.attr,
&dev_attr_calibrate.attr,
NULL
};
ATTRIBUTE_GROUPS(raydium_i2c);
static int raydium_i2c_power_on(struct raydium_data *ts)
{
int error;
if (!ts->reset_gpio)
return 0;
gpiod_set_value_cansleep(ts->reset_gpio, 1);
error = regulator_enable(ts->avdd);
if (error) {
dev_err(&ts->client->dev,
"failed to enable avdd regulator: %d\n", error);
goto release_reset_gpio;
}
error = regulator_enable(ts->vccio);
if (error) {
regulator_disable(ts->avdd);
dev_err(&ts->client->dev,
"failed to enable vccio regulator: %d\n", error);
goto release_reset_gpio;
}
udelay(RM_POWERON_DELAY_USEC);
release_reset_gpio:
gpiod_set_value_cansleep(ts->reset_gpio, 0);
if (error)
return error;
msleep(RM_RESET_DELAY_MSEC);
return 0;
}
static void raydium_i2c_power_off(void *_data)
{
struct raydium_data *ts = _data;
if (ts->reset_gpio) {
gpiod_set_value_cansleep(ts->reset_gpio, 1);
regulator_disable(ts->vccio);
regulator_disable(ts->avdd);
}
}
static int raydium_i2c_probe(struct i2c_client *client)
{
union i2c_smbus_data dummy;
struct raydium_data *ts;
int error;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev,
"i2c check functionality error (need I2C_FUNC_I2C)\n");
return -ENXIO;
}
ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
if (!ts)
return -ENOMEM;
mutex_init(&ts->sysfs_mutex);
ts->client = client;
i2c_set_clientdata(client, ts);
ts->avdd = devm_regulator_get(&client->dev, "avdd");
if (IS_ERR(ts->avdd))
return dev_err_probe(&client->dev, PTR_ERR(ts->avdd),
"Failed to get 'avdd' regulator\n");
ts->vccio = devm_regulator_get(&client->dev, "vccio");
if (IS_ERR(ts->vccio))
return dev_err_probe(&client->dev, PTR_ERR(ts->vccio),
"Failed to get 'vccio' regulator\n");
ts->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
GPIOD_OUT_LOW);
if (IS_ERR(ts->reset_gpio))
return dev_err_probe(&client->dev, PTR_ERR(ts->reset_gpio),
"Failed to get reset gpio\n");
error = raydium_i2c_power_on(ts);
if (error)
return error;
error = devm_add_action_or_reset(&client->dev,
raydium_i2c_power_off, ts);
if (error) {
dev_err(&client->dev,
"failed to install power off action: %d\n", error);
return error;
}
/* Make sure there is something at this address */
if (i2c_smbus_xfer(client->adapter, client->addr, 0,
I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) {
dev_err(&client->dev, "nothing at this address\n");
return -ENXIO;
}
error = raydium_i2c_initialize(ts);
if (error) {
dev_err(&client->dev, "failed to initialize: %d\n", error);
return error;
}
ts->report_data = devm_kmalloc(&client->dev,
ts->pkg_size, GFP_KERNEL);
if (!ts->report_data)
return -ENOMEM;
ts->input = devm_input_allocate_device(&client->dev);
if (!ts->input) {
dev_err(&client->dev, "Failed to allocate input device\n");
return -ENOMEM;
}
ts->input->name = "Raydium Touchscreen";
ts->input->id.bustype = BUS_I2C;
input_set_abs_params(ts->input, ABS_MT_POSITION_X,
0, le16_to_cpu(ts->info.x_max), 0, 0);
input_set_abs_params(ts->input, ABS_MT_POSITION_Y,
0, le16_to_cpu(ts->info.y_max), 0, 0);
input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->info.x_res);
input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->info.y_res);
input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
error = input_mt_init_slots(ts->input, RM_MAX_TOUCH_NUM,
INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
if (error) {
dev_err(&client->dev,
"failed to initialize MT slots: %d\n", error);
return error;
}
error = input_register_device(ts->input);
if (error) {
dev_err(&client->dev,
"unable to register input device: %d\n", error);
return error;
}
error = devm_request_threaded_irq(&client->dev, client->irq,
NULL, raydium_i2c_irq,
IRQF_ONESHOT, client->name, ts);
if (error) {
dev_err(&client->dev, "Failed to register interrupt\n");
return error;
}
return 0;
}
static void raydium_enter_sleep(struct i2c_client *client)
{
static const u8 sleep_cmd[] = { 0x5A, 0xff, 0x00, 0x0f };
int error;
error = raydium_i2c_send(client, RM_CMD_ENTER_SLEEP,
sleep_cmd, sizeof(sleep_cmd));
if (error)
dev_err(&client->dev,
"sleep command failed: %d\n", error);
}
static int raydium_i2c_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct raydium_data *ts = i2c_get_clientdata(client);
/* Sleep is not available in BLDR recovery mode */
if (ts->boot_mode != RAYDIUM_TS_MAIN)
return -EBUSY;
disable_irq(client->irq);
if (device_may_wakeup(dev)) {
raydium_enter_sleep(client);
} else {
raydium_i2c_power_off(ts);
}
return 0;
}
static int raydium_i2c_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct raydium_data *ts = i2c_get_clientdata(client);
if (device_may_wakeup(dev)) {
raydium_i2c_sw_reset(client);
} else {
raydium_i2c_power_on(ts);
raydium_i2c_initialize(ts);
}
enable_irq(client->irq);
return 0;
}
static DEFINE_SIMPLE_DEV_PM_OPS(raydium_i2c_pm_ops,
raydium_i2c_suspend, raydium_i2c_resume);
static const struct i2c_device_id raydium_i2c_id[] = {
{ "raydium_i2c" },
{ "rm32380" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, raydium_i2c_id);
#ifdef CONFIG_ACPI
static const struct acpi_device_id raydium_acpi_id[] = {
{ "RAYD0001", 0 },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(acpi, raydium_acpi_id);
#endif
#ifdef CONFIG_OF
static const struct of_device_id raydium_of_match[] = {
{ .compatible = "raydium,rm32380", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, raydium_of_match);
#endif
static struct i2c_driver raydium_i2c_driver = {
.probe = raydium_i2c_probe,
.id_table = raydium_i2c_id,
.driver = {
.name = "raydium_ts",
.dev_groups = raydium_i2c_groups,
.pm = pm_sleep_ptr(&raydium_i2c_pm_ops),
.acpi_match_table = ACPI_PTR(raydium_acpi_id),
.of_match_table = of_match_ptr(raydium_of_match),
},
};
module_i2c_driver(raydium_i2c_driver);
MODULE_AUTHOR("Raydium");
MODULE_DESCRIPTION("Raydium I2c Touchscreen driver");
MODULE_LICENSE("GPL v2");
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