Skip to content
Permalink
Branch: master
Find file Copy path
Find file Copy path
1 contributor

Users who have contributed to this file

1134 lines (923 sloc) 26 KB
// SPDX-License-Identifier: GPL-2.0+
/*
* Azoteq IQS550/572/525 Trackpad/Touchscreen Controller
*
* Copyright (C) 2018
* Author: Jeff LaBundy <jeff@labundy.com>
*
* These devices require firmware exported from a PC-based configuration tool
* made available by the vendor. Firmware files may be pushed to the device's
* nonvolatile memory by writing the filename to the 'fw_file' sysfs control.
*
* Link to PC-based configuration tool and data sheet: http://www.azoteq.com/
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.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/input/touchscreen.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/slab.h>
#include <asm/unaligned.h>
#define IQS5XX_FW_FILE_LEN 64
#define IQS5XX_NUM_RETRIES 10
#define IQS5XX_NUM_POINTS 256
#define IQS5XX_NUM_CONTACTS 5
#define IQS5XX_WR_BYTES_MAX 2
#define IQS5XX_PROD_NUM_IQS550 40
#define IQS5XX_PROD_NUM_IQS572 58
#define IQS5XX_PROD_NUM_IQS525 52
#define IQS5XX_PROJ_NUM_A000 0
#define IQS5XX_PROJ_NUM_B000 15
#define IQS5XX_MAJOR_VER_MIN 2
#define IQS5XX_RESUME 0x00
#define IQS5XX_SUSPEND 0x01
#define IQS5XX_SW_INPUT_EVENT 0x10
#define IQS5XX_SETUP_COMPLETE 0x40
#define IQS5XX_EVENT_MODE 0x01
#define IQS5XX_TP_EVENT 0x04
#define IQS5XX_FLIP_X 0x01
#define IQS5XX_FLIP_Y 0x02
#define IQS5XX_SWITCH_XY_AXIS 0x04
#define IQS5XX_PROD_NUM 0x0000
#define IQS5XX_ABS_X 0x0016
#define IQS5XX_ABS_Y 0x0018
#define IQS5XX_SYS_CTRL0 0x0431
#define IQS5XX_SYS_CTRL1 0x0432
#define IQS5XX_SYS_CFG0 0x058E
#define IQS5XX_SYS_CFG1 0x058F
#define IQS5XX_TOTAL_RX 0x063D
#define IQS5XX_TOTAL_TX 0x063E
#define IQS5XX_XY_CFG0 0x0669
#define IQS5XX_X_RES 0x066E
#define IQS5XX_Y_RES 0x0670
#define IQS5XX_CHKSM 0x83C0
#define IQS5XX_APP 0x8400
#define IQS5XX_CSTM 0xBE00
#define IQS5XX_PMAP_END 0xBFFF
#define IQS5XX_END_COMM 0xEEEE
#define IQS5XX_CHKSM_LEN (IQS5XX_APP - IQS5XX_CHKSM)
#define IQS5XX_APP_LEN (IQS5XX_CSTM - IQS5XX_APP)
#define IQS5XX_CSTM_LEN (IQS5XX_PMAP_END + 1 - IQS5XX_CSTM)
#define IQS5XX_PMAP_LEN (IQS5XX_PMAP_END + 1 - IQS5XX_CHKSM)
#define IQS5XX_REC_HDR_LEN 4
#define IQS5XX_REC_LEN_MAX 255
#define IQS5XX_REC_TYPE_DATA 0x00
#define IQS5XX_REC_TYPE_EOF 0x01
#define IQS5XX_BL_ADDR_MASK 0x40
#define IQS5XX_BL_CMD_VER 0x00
#define IQS5XX_BL_CMD_READ 0x01
#define IQS5XX_BL_CMD_EXEC 0x02
#define IQS5XX_BL_CMD_CRC 0x03
#define IQS5XX_BL_BLK_LEN_MAX 64
#define IQS5XX_BL_ID 0x0200
#define IQS5XX_BL_STATUS_RESET 0x00
#define IQS5XX_BL_STATUS_AVAIL 0xA5
#define IQS5XX_BL_STATUS_NONE 0xEE
#define IQS5XX_BL_CRC_PASS 0x00
#define IQS5XX_BL_CRC_FAIL 0x01
#define IQS5XX_BL_ATTEMPTS 3
struct iqs5xx_private {
struct i2c_client *client;
struct input_dev *input;
struct gpio_desc *reset_gpio;
struct mutex lock;
u8 bl_status;
};
struct iqs5xx_dev_id_info {
__be16 prod_num;
__be16 proj_num;
u8 major_ver;
u8 minor_ver;
u8 bl_status;
} __packed;
struct iqs5xx_ihex_rec {
char start;
char len[2];
char addr[4];
char type[2];
char data[2];
} __packed;
struct iqs5xx_touch_data {
__be16 abs_x;
__be16 abs_y;
__be16 strength;
u8 area;
} __packed;
static int iqs5xx_read_burst(struct i2c_client *client,
u16 reg, void *val, u16 len)
{
__be16 reg_buf = cpu_to_be16(reg);
int ret, i;
struct i2c_msg msg[] = {
{
.addr = client->addr,
.flags = 0,
.len = sizeof(reg_buf),
.buf = (u8 *)&reg_buf,
},
{
.addr = client->addr,
.flags = I2C_M_RD,
.len = len,
.buf = (u8 *)val,
},
};
/*
* The first addressing attempt outside of a communication window fails
* and must be retried, after which the device clock stretches until it
* is available.
*/
for (i = 0; i < IQS5XX_NUM_RETRIES; i++) {
ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
if (ret == ARRAY_SIZE(msg))
return 0;
usleep_range(200, 300);
}
if (ret >= 0)
ret = -EIO;
dev_err(&client->dev, "Failed to read from address 0x%04X: %d\n",
reg, ret);
return ret;
}
static int iqs5xx_read_word(struct i2c_client *client, u16 reg, u16 *val)
{
__be16 val_buf;
int error;
error = iqs5xx_read_burst(client, reg, &val_buf, sizeof(val_buf));
if (error)
return error;
*val = be16_to_cpu(val_buf);
return 0;
}
static int iqs5xx_read_byte(struct i2c_client *client, u16 reg, u8 *val)
{
return iqs5xx_read_burst(client, reg, val, sizeof(*val));
}
static int iqs5xx_write_burst(struct i2c_client *client,
u16 reg, const void *val, u16 len)
{
int ret, i;
u16 mlen = sizeof(reg) + len;
u8 mbuf[sizeof(reg) + IQS5XX_WR_BYTES_MAX];
if (len > IQS5XX_WR_BYTES_MAX)
return -EINVAL;
put_unaligned_be16(reg, mbuf);
memcpy(mbuf + sizeof(reg), val, len);
/*
* The first addressing attempt outside of a communication window fails
* and must be retried, after which the device clock stretches until it
* is available.
*/
for (i = 0; i < IQS5XX_NUM_RETRIES; i++) {
ret = i2c_master_send(client, mbuf, mlen);
if (ret == mlen)
return 0;
usleep_range(200, 300);
}
if (ret >= 0)
ret = -EIO;
dev_err(&client->dev, "Failed to write to address 0x%04X: %d\n",
reg, ret);
return ret;
}
static int iqs5xx_write_word(struct i2c_client *client, u16 reg, u16 val)
{
__be16 val_buf = cpu_to_be16(val);
return iqs5xx_write_burst(client, reg, &val_buf, sizeof(val_buf));
}
static int iqs5xx_write_byte(struct i2c_client *client, u16 reg, u8 val)
{
return iqs5xx_write_burst(client, reg, &val, sizeof(val));
}
static void iqs5xx_reset(struct i2c_client *client)
{
struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
gpiod_set_value_cansleep(iqs5xx->reset_gpio, 1);
usleep_range(200, 300);
gpiod_set_value_cansleep(iqs5xx->reset_gpio, 0);
}
static int iqs5xx_bl_cmd(struct i2c_client *client, u8 bl_cmd, u16 bl_addr)
{
struct i2c_msg msg;
int ret;
u8 mbuf[sizeof(bl_cmd) + sizeof(bl_addr)];
msg.addr = client->addr ^ IQS5XX_BL_ADDR_MASK;
msg.flags = 0;
msg.len = sizeof(bl_cmd);
msg.buf = mbuf;
*mbuf = bl_cmd;
switch (bl_cmd) {
case IQS5XX_BL_CMD_VER:
case IQS5XX_BL_CMD_CRC:
case IQS5XX_BL_CMD_EXEC:
break;
case IQS5XX_BL_CMD_READ:
msg.len += sizeof(bl_addr);
put_unaligned_be16(bl_addr, mbuf + sizeof(bl_cmd));
break;
default:
return -EINVAL;
}
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret != 1)
goto msg_fail;
switch (bl_cmd) {
case IQS5XX_BL_CMD_VER:
msg.len = sizeof(u16);
break;
case IQS5XX_BL_CMD_CRC:
msg.len = sizeof(u8);
/*
* This delay saves the bus controller the trouble of having to
* tolerate a relatively long clock-stretching period while the
* CRC is calculated.
*/
msleep(50);
break;
case IQS5XX_BL_CMD_EXEC:
usleep_range(10000, 10100);
/* fall through */
default:
return 0;
}
msg.flags = I2C_M_RD;
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret != 1)
goto msg_fail;
if (bl_cmd == IQS5XX_BL_CMD_VER &&
get_unaligned_be16(mbuf) != IQS5XX_BL_ID) {
dev_err(&client->dev, "Unrecognized bootloader ID: 0x%04X\n",
get_unaligned_be16(mbuf));
return -EINVAL;
}
if (bl_cmd == IQS5XX_BL_CMD_CRC && *mbuf != IQS5XX_BL_CRC_PASS) {
dev_err(&client->dev, "Bootloader CRC failed\n");
return -EIO;
}
return 0;
msg_fail:
if (ret >= 0)
ret = -EIO;
if (bl_cmd != IQS5XX_BL_CMD_VER)
dev_err(&client->dev,
"Unsuccessful bootloader command 0x%02X: %d\n",
bl_cmd, ret);
return ret;
}
static int iqs5xx_bl_open(struct i2c_client *client)
{
int error, i, j;
/*
* The device opens a bootloader polling window for 2 ms following the
* release of reset. If the host cannot establish communication during
* this time frame, it must cycle reset again.
*/
for (i = 0; i < IQS5XX_BL_ATTEMPTS; i++) {
iqs5xx_reset(client);
for (j = 0; j < IQS5XX_NUM_RETRIES; j++) {
error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_VER, 0);
if (!error || error == -EINVAL)
return error;
}
}
dev_err(&client->dev, "Failed to open bootloader: %d\n", error);
return error;
}
static int iqs5xx_bl_write(struct i2c_client *client,
u16 bl_addr, u8 *pmap_data, u16 pmap_len)
{
struct i2c_msg msg;
int ret, i;
u8 mbuf[sizeof(bl_addr) + IQS5XX_BL_BLK_LEN_MAX];
if (pmap_len % IQS5XX_BL_BLK_LEN_MAX)
return -EINVAL;
msg.addr = client->addr ^ IQS5XX_BL_ADDR_MASK;
msg.flags = 0;
msg.len = sizeof(mbuf);
msg.buf = mbuf;
for (i = 0; i < pmap_len; i += IQS5XX_BL_BLK_LEN_MAX) {
put_unaligned_be16(bl_addr + i, mbuf);
memcpy(mbuf + sizeof(bl_addr), pmap_data + i,
sizeof(mbuf) - sizeof(bl_addr));
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret != 1)
goto msg_fail;
usleep_range(10000, 10100);
}
return 0;
msg_fail:
if (ret >= 0)
ret = -EIO;
dev_err(&client->dev, "Failed to write block at address 0x%04X: %d\n",
bl_addr + i, ret);
return ret;
}
static int iqs5xx_bl_verify(struct i2c_client *client,
u16 bl_addr, u8 *pmap_data, u16 pmap_len)
{
struct i2c_msg msg;
int ret, i;
u8 bl_data[IQS5XX_BL_BLK_LEN_MAX];
if (pmap_len % IQS5XX_BL_BLK_LEN_MAX)
return -EINVAL;
msg.addr = client->addr ^ IQS5XX_BL_ADDR_MASK;
msg.flags = I2C_M_RD;
msg.len = sizeof(bl_data);
msg.buf = bl_data;
for (i = 0; i < pmap_len; i += IQS5XX_BL_BLK_LEN_MAX) {
ret = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_READ, bl_addr + i);
if (ret)
return ret;
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret != 1)
goto msg_fail;
if (memcmp(bl_data, pmap_data + i, sizeof(bl_data))) {
dev_err(&client->dev,
"Failed to verify block at address 0x%04X\n",
bl_addr + i);
return -EIO;
}
}
return 0;
msg_fail:
if (ret >= 0)
ret = -EIO;
dev_err(&client->dev, "Failed to read block at address 0x%04X: %d\n",
bl_addr + i, ret);
return ret;
}
static int iqs5xx_set_state(struct i2c_client *client, u8 state)
{
struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
int error1, error2;
if (iqs5xx->bl_status == IQS5XX_BL_STATUS_RESET)
return 0;
mutex_lock(&iqs5xx->lock);
/*
* Addressing the device outside of a communication window prompts it
* to assert the RDY output, so disable the interrupt line to prevent
* the handler from servicing a false interrupt.
*/
disable_irq(client->irq);
error1 = iqs5xx_write_byte(client, IQS5XX_SYS_CTRL1, state);
error2 = iqs5xx_write_byte(client, IQS5XX_END_COMM, 0);
usleep_range(50, 100);
enable_irq(client->irq);
mutex_unlock(&iqs5xx->lock);
if (error1)
return error1;
return error2;
}
static int iqs5xx_open(struct input_dev *input)
{
struct iqs5xx_private *iqs5xx = input_get_drvdata(input);
return iqs5xx_set_state(iqs5xx->client, IQS5XX_RESUME);
}
static void iqs5xx_close(struct input_dev *input)
{
struct iqs5xx_private *iqs5xx = input_get_drvdata(input);
iqs5xx_set_state(iqs5xx->client, IQS5XX_SUSPEND);
}
static int iqs5xx_axis_init(struct i2c_client *client)
{
struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
struct touchscreen_properties prop;
struct input_dev *input;
int error;
u16 max_x, max_x_hw;
u16 max_y, max_y_hw;
u8 val;
if (!iqs5xx->input) {
input = devm_input_allocate_device(&client->dev);
if (!input)
return -ENOMEM;
input->name = client->name;
input->id.bustype = BUS_I2C;
input->open = iqs5xx_open;
input->close = iqs5xx_close;
input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
input_set_capability(input, EV_ABS, ABS_MT_PRESSURE);
error = input_mt_init_slots(input,
IQS5XX_NUM_CONTACTS, INPUT_MT_DIRECT);
if (error) {
dev_err(&client->dev,
"Failed to initialize slots: %d\n", error);
return error;
}
input_set_drvdata(input, iqs5xx);
iqs5xx->input = input;
}
touchscreen_parse_properties(iqs5xx->input, true, &prop);
error = iqs5xx_read_byte(client, IQS5XX_TOTAL_RX, &val);
if (error)
return error;
max_x_hw = (val - 1) * IQS5XX_NUM_POINTS;
error = iqs5xx_read_byte(client, IQS5XX_TOTAL_TX, &val);
if (error)
return error;
max_y_hw = (val - 1) * IQS5XX_NUM_POINTS;
error = iqs5xx_read_byte(client, IQS5XX_XY_CFG0, &val);
if (error)
return error;
if (val & IQS5XX_SWITCH_XY_AXIS)
swap(max_x_hw, max_y_hw);
if (prop.swap_x_y)
val ^= IQS5XX_SWITCH_XY_AXIS;
if (prop.invert_x)
val ^= prop.swap_x_y ? IQS5XX_FLIP_Y : IQS5XX_FLIP_X;
if (prop.invert_y)
val ^= prop.swap_x_y ? IQS5XX_FLIP_X : IQS5XX_FLIP_Y;
error = iqs5xx_write_byte(client, IQS5XX_XY_CFG0, val);
if (error)
return error;
if (prop.max_x > max_x_hw) {
dev_err(&client->dev, "Invalid maximum x-coordinate: %u > %u\n",
prop.max_x, max_x_hw);
return -EINVAL;
} else if (prop.max_x == 0) {
error = iqs5xx_read_word(client, IQS5XX_X_RES, &max_x);
if (error)
return error;
input_abs_set_max(iqs5xx->input,
prop.swap_x_y ? ABS_MT_POSITION_Y :
ABS_MT_POSITION_X,
max_x);
} else {
max_x = (u16)prop.max_x;
}
if (prop.max_y > max_y_hw) {
dev_err(&client->dev, "Invalid maximum y-coordinate: %u > %u\n",
prop.max_y, max_y_hw);
return -EINVAL;
} else if (prop.max_y == 0) {
error = iqs5xx_read_word(client, IQS5XX_Y_RES, &max_y);
if (error)
return error;
input_abs_set_max(iqs5xx->input,
prop.swap_x_y ? ABS_MT_POSITION_X :
ABS_MT_POSITION_Y,
max_y);
} else {
max_y = (u16)prop.max_y;
}
/*
* Write horizontal and vertical resolution to the device in case its
* original defaults were overridden or swapped as per the properties
* specified in the device tree.
*/
error = iqs5xx_write_word(client,
prop.swap_x_y ? IQS5XX_Y_RES : IQS5XX_X_RES,
max_x);
if (error)
return error;
return iqs5xx_write_word(client,
prop.swap_x_y ? IQS5XX_X_RES : IQS5XX_Y_RES,
max_y);
}
static int iqs5xx_dev_init(struct i2c_client *client)
{
struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
struct iqs5xx_dev_id_info *dev_id_info;
int error;
u8 val;
u8 buf[sizeof(*dev_id_info) + 1];
error = iqs5xx_read_burst(client, IQS5XX_PROD_NUM,
&buf[1], sizeof(*dev_id_info));
if (error)
return iqs5xx_bl_open(client);
/*
* A000 and B000 devices use 8-bit and 16-bit addressing, respectively.
* Querying an A000 device's version information with 16-bit addressing
* gives the appearance that the data is shifted by one byte; a nonzero
* leading array element suggests this could be the case (in which case
* the missing zero is prepended).
*/
buf[0] = 0;
dev_id_info = (struct iqs5xx_dev_id_info *)&buf[(buf[1] > 0) ? 0 : 1];
switch (be16_to_cpu(dev_id_info->prod_num)) {
case IQS5XX_PROD_NUM_IQS550:
case IQS5XX_PROD_NUM_IQS572:
case IQS5XX_PROD_NUM_IQS525:
break;
default:
dev_err(&client->dev, "Unrecognized product number: %u\n",
be16_to_cpu(dev_id_info->prod_num));
return -EINVAL;
}
switch (be16_to_cpu(dev_id_info->proj_num)) {
case IQS5XX_PROJ_NUM_A000:
dev_err(&client->dev, "Unsupported project number: %u\n",
be16_to_cpu(dev_id_info->proj_num));
return iqs5xx_bl_open(client);
case IQS5XX_PROJ_NUM_B000:
break;
default:
dev_err(&client->dev, "Unrecognized project number: %u\n",
be16_to_cpu(dev_id_info->proj_num));
return -EINVAL;
}
if (dev_id_info->major_ver < IQS5XX_MAJOR_VER_MIN) {
dev_err(&client->dev, "Unsupported major version: %u\n",
dev_id_info->major_ver);
return iqs5xx_bl_open(client);
}
switch (dev_id_info->bl_status) {
case IQS5XX_BL_STATUS_AVAIL:
case IQS5XX_BL_STATUS_NONE:
break;
default:
dev_err(&client->dev,
"Unrecognized bootloader status: 0x%02X\n",
dev_id_info->bl_status);
return -EINVAL;
}
error = iqs5xx_axis_init(client);
if (error)
return error;
error = iqs5xx_read_byte(client, IQS5XX_SYS_CFG0, &val);
if (error)
return error;
val |= IQS5XX_SETUP_COMPLETE;
val &= ~IQS5XX_SW_INPUT_EVENT;
error = iqs5xx_write_byte(client, IQS5XX_SYS_CFG0, val);
if (error)
return error;
val = IQS5XX_TP_EVENT | IQS5XX_EVENT_MODE;
error = iqs5xx_write_byte(client, IQS5XX_SYS_CFG1, val);
if (error)
return error;
error = iqs5xx_write_byte(client, IQS5XX_END_COMM, 0);
if (error)
return error;
iqs5xx->bl_status = dev_id_info->bl_status;
/*
* Closure of the first communication window that appears following the
* release of reset appears to kick off an initialization period during
* which further communication is met with clock stretching. The return
* from this function is delayed so that further communication attempts
* avoid this period.
*/
msleep(100);
return 0;
}
static irqreturn_t iqs5xx_irq(int irq, void *data)
{
struct iqs5xx_private *iqs5xx = data;
struct iqs5xx_touch_data touch_data[IQS5XX_NUM_CONTACTS];
struct i2c_client *client = iqs5xx->client;
struct input_dev *input = iqs5xx->input;
int error, i;
/*
* This check is purely a precaution, as the device does not assert the
* RDY output during bootloader mode. If the device operates outside of
* bootloader mode, the input device is guaranteed to be allocated.
*/
if (iqs5xx->bl_status == IQS5XX_BL_STATUS_RESET)
return IRQ_NONE;
error = iqs5xx_read_burst(client, IQS5XX_ABS_X,
touch_data, sizeof(touch_data));
if (error)
return IRQ_NONE;
for (i = 0; i < ARRAY_SIZE(touch_data); i++) {
u16 pressure = be16_to_cpu(touch_data[i].strength);
input_mt_slot(input, i);
if (input_mt_report_slot_state(input, MT_TOOL_FINGER,
pressure != 0)) {
input_report_abs(input, ABS_MT_POSITION_X,
be16_to_cpu(touch_data[i].abs_x));
input_report_abs(input, ABS_MT_POSITION_Y,
be16_to_cpu(touch_data[i].abs_y));
input_report_abs(input, ABS_MT_PRESSURE, pressure);
}
}
input_mt_sync_frame(input);
input_sync(input);
error = iqs5xx_write_byte(client, IQS5XX_END_COMM, 0);
if (error)
return IRQ_NONE;
/*
* Once the communication window is closed, a small delay is added to
* ensure the device's RDY output has been deasserted by the time the
* interrupt handler returns.
*/
usleep_range(50, 100);
return IRQ_HANDLED;
}
static int iqs5xx_fw_file_parse(struct i2c_client *client,
const char *fw_file, u8 *pmap)
{
const struct firmware *fw;
struct iqs5xx_ihex_rec *rec;
size_t pos = 0;
int error, i;
u16 rec_num = 1;
u16 rec_addr;
u8 rec_len, rec_type, rec_chksm, chksm;
u8 rec_hdr[IQS5XX_REC_HDR_LEN];
u8 rec_data[IQS5XX_REC_LEN_MAX];
/*
* Firmware exported from the vendor's configuration tool deviates from
* standard ihex as follows: (1) the checksum for records corresponding
* to user-exported settings is not recalculated, and (2) an address of
* 0xFFFF is used for the EOF record.
*
* Because the ihex2fw tool tolerates neither (1) nor (2), the slightly
* nonstandard ihex firmware is parsed directly by the driver.
*/
error = request_firmware(&fw, fw_file, &client->dev);
if (error) {
dev_err(&client->dev, "Failed to request firmware %s: %d\n",
fw_file, error);
return error;
}
do {
if (pos + sizeof(*rec) > fw->size) {
dev_err(&client->dev, "Insufficient firmware size\n");
error = -EINVAL;
break;
}
rec = (struct iqs5xx_ihex_rec *)(fw->data + pos);
pos += sizeof(*rec);
if (rec->start != ':') {
dev_err(&client->dev, "Invalid start at record %u\n",
rec_num);
error = -EINVAL;
break;
}
error = hex2bin(rec_hdr, rec->len, sizeof(rec_hdr));
if (error) {
dev_err(&client->dev, "Invalid header at record %u\n",
rec_num);
break;
}
rec_len = *rec_hdr;
rec_addr = get_unaligned_be16(rec_hdr + sizeof(rec_len));
rec_type = *(rec_hdr + sizeof(rec_len) + sizeof(rec_addr));
if (pos + rec_len * 2 > fw->size) {
dev_err(&client->dev, "Insufficient firmware size\n");
error = -EINVAL;
break;
}
pos += (rec_len * 2);
error = hex2bin(rec_data, rec->data, rec_len);
if (error) {
dev_err(&client->dev, "Invalid data at record %u\n",
rec_num);
break;
}
error = hex2bin(&rec_chksm,
rec->data + rec_len * 2, sizeof(rec_chksm));
if (error) {
dev_err(&client->dev, "Invalid checksum at record %u\n",
rec_num);
break;
}
chksm = 0;
for (i = 0; i < sizeof(rec_hdr); i++)
chksm += rec_hdr[i];
for (i = 0; i < rec_len; i++)
chksm += rec_data[i];
chksm = ~chksm + 1;
if (chksm != rec_chksm && rec_addr < IQS5XX_CSTM) {
dev_err(&client->dev,
"Incorrect checksum at record %u\n",
rec_num);
error = -EINVAL;
break;
}
switch (rec_type) {
case IQS5XX_REC_TYPE_DATA:
if (rec_addr < IQS5XX_CHKSM ||
rec_addr > IQS5XX_PMAP_END) {
dev_err(&client->dev,
"Invalid address at record %u\n",
rec_num);
error = -EINVAL;
} else {
memcpy(pmap + rec_addr - IQS5XX_CHKSM,
rec_data, rec_len);
}
break;
case IQS5XX_REC_TYPE_EOF:
break;
default:
dev_err(&client->dev, "Invalid type at record %u\n",
rec_num);
error = -EINVAL;
}
if (error)
break;
rec_num++;
while (pos < fw->size) {
if (*(fw->data + pos) == ':')
break;
pos++;
}
} while (rec_type != IQS5XX_REC_TYPE_EOF);
release_firmware(fw);
return error;
}
static int iqs5xx_fw_file_write(struct i2c_client *client, const char *fw_file)
{
struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
int error;
u8 *pmap;
if (iqs5xx->bl_status == IQS5XX_BL_STATUS_NONE)
return -EPERM;
pmap = kzalloc(IQS5XX_PMAP_LEN, GFP_KERNEL);
if (!pmap)
return -ENOMEM;
error = iqs5xx_fw_file_parse(client, fw_file, pmap);
if (error)
goto err_kfree;
mutex_lock(&iqs5xx->lock);
/*
* Disable the interrupt line in case the first attempt(s) to enter the
* bootloader don't happen quickly enough, in which case the device may
* assert the RDY output until the next attempt.
*/
disable_irq(client->irq);
iqs5xx->bl_status = IQS5XX_BL_STATUS_RESET;
error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_VER, 0);
if (error) {
error = iqs5xx_bl_open(client);
if (error)
goto err_reset;
}
error = iqs5xx_bl_write(client, IQS5XX_CHKSM, pmap, IQS5XX_PMAP_LEN);
if (error)
goto err_reset;
error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_CRC, 0);
if (error)
goto err_reset;
error = iqs5xx_bl_verify(client, IQS5XX_CSTM,
pmap + IQS5XX_CHKSM_LEN + IQS5XX_APP_LEN,
IQS5XX_CSTM_LEN);
if (error)
goto err_reset;
error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_EXEC, 0);
err_reset:
if (error) {
iqs5xx_reset(client);
usleep_range(10000, 10100);
}
error = iqs5xx_dev_init(client);
if (!error && iqs5xx->bl_status == IQS5XX_BL_STATUS_RESET)
error = -EINVAL;
enable_irq(client->irq);
mutex_unlock(&iqs5xx->lock);
err_kfree:
kfree(pmap);
return error;
}
static ssize_t fw_file_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct iqs5xx_private *iqs5xx = dev_get_drvdata(dev);
struct i2c_client *client = iqs5xx->client;
size_t len = count;
bool input_reg = !iqs5xx->input;
char fw_file[IQS5XX_FW_FILE_LEN + 1];
int error;
if (!len)
return -EINVAL;
if (buf[len - 1] == '\n')
len--;
if (len > IQS5XX_FW_FILE_LEN)
return -ENAMETOOLONG;
memcpy(fw_file, buf, len);
fw_file[len] = '\0';
error = iqs5xx_fw_file_write(client, fw_file);
if (error)
return error;
/*
* If the input device was not allocated already, it is guaranteed to
* be allocated by this point and can finally be registered.
*/
if (input_reg) {
error = input_register_device(iqs5xx->input);
if (error) {
dev_err(&client->dev,
"Failed to register device: %d\n",
error);
return error;
}
}
return count;
}
static DEVICE_ATTR_WO(fw_file);
static struct attribute *iqs5xx_attrs[] = {
&dev_attr_fw_file.attr,
NULL,
};
static const struct attribute_group iqs5xx_attr_group = {
.attrs = iqs5xx_attrs,
};
static int __maybe_unused iqs5xx_suspend(struct device *dev)
{
struct iqs5xx_private *iqs5xx = dev_get_drvdata(dev);
struct input_dev *input = iqs5xx->input;
int error = 0;
if (!input)
return error;
mutex_lock(&input->mutex);
if (input->users)
error = iqs5xx_set_state(iqs5xx->client, IQS5XX_SUSPEND);
mutex_unlock(&input->mutex);
return error;
}
static int __maybe_unused iqs5xx_resume(struct device *dev)
{
struct iqs5xx_private *iqs5xx = dev_get_drvdata(dev);
struct input_dev *input = iqs5xx->input;
int error = 0;
if (!input)
return error;
mutex_lock(&input->mutex);
if (input->users)
error = iqs5xx_set_state(iqs5xx->client, IQS5XX_RESUME);
mutex_unlock(&input->mutex);
return error;
}
static SIMPLE_DEV_PM_OPS(iqs5xx_pm, iqs5xx_suspend, iqs5xx_resume);
static int iqs5xx_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct iqs5xx_private *iqs5xx;
int error;
iqs5xx = devm_kzalloc(&client->dev, sizeof(*iqs5xx), GFP_KERNEL);
if (!iqs5xx)
return -ENOMEM;
dev_set_drvdata(&client->dev, iqs5xx);
i2c_set_clientdata(client, iqs5xx);
iqs5xx->client = client;
iqs5xx->reset_gpio = devm_gpiod_get(&client->dev,
"reset", GPIOD_OUT_LOW);
if (IS_ERR(iqs5xx->reset_gpio)) {
error = PTR_ERR(iqs5xx->reset_gpio);
dev_err(&client->dev, "Failed to request GPIO: %d\n", error);
return error;
}
mutex_init(&iqs5xx->lock);
iqs5xx_reset(client);
usleep_range(10000, 10100);
error = iqs5xx_dev_init(client);
if (error)
return error;
error = devm_request_threaded_irq(&client->dev, client->irq,
NULL, iqs5xx_irq, IRQF_ONESHOT,
client->name, iqs5xx);
if (error) {
dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
return error;
}
error = devm_device_add_group(&client->dev, &iqs5xx_attr_group);
if (error) {
dev_err(&client->dev, "Failed to add attributes: %d\n", error);
return error;
}
if (iqs5xx->input) {
error = input_register_device(iqs5xx->input);
if (error)
dev_err(&client->dev,
"Failed to register device: %d\n",
error);
}
return error;
}
static const struct i2c_device_id iqs5xx_id[] = {
{ "iqs550", 0 },
{ "iqs572", 1 },
{ "iqs525", 2 },
{ }
};
MODULE_DEVICE_TABLE(i2c, iqs5xx_id);
static const struct of_device_id iqs5xx_of_match[] = {
{ .compatible = "azoteq,iqs550" },
{ .compatible = "azoteq,iqs572" },
{ .compatible = "azoteq,iqs525" },
{ }
};
MODULE_DEVICE_TABLE(of, iqs5xx_of_match);
static struct i2c_driver iqs5xx_i2c_driver = {
.driver = {
.name = "iqs5xx",
.of_match_table = iqs5xx_of_match,
.pm = &iqs5xx_pm,
},
.id_table = iqs5xx_id,
.probe = iqs5xx_probe,
};
module_i2c_driver(iqs5xx_i2c_driver);
MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
MODULE_DESCRIPTION("Azoteq IQS550/572/525 Trackpad/Touchscreen Controller");
MODULE_LICENSE("GPL");
You can’t perform that action at this time.