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linux/drivers/input/touchscreen/atmel_mxt_ts.c

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/*
* Atmel maXTouch Touchscreen driver
*
* Copyright (C) 2010 Samsung Electronics Co.Ltd
* Copyright (C) 2011-2014 Atmel Corporation
* Copyright (C) 2012 Google, Inc.
*
* Author: Joonyoung Shim <jy0922.shim@samsung.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.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/i2c.h>
#include <linux/i2c/atmel_mxt_ts.h>
#include <linux/input/mt.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/slab.h>
/* Version */
#define MXT_VER_20 20
#define MXT_VER_21 21
#define MXT_VER_22 22
/* Firmware files */
#define MXT_FW_NAME "maxtouch.fw"
#define MXT_CFG_NAME "maxtouch.cfg"
#define MXT_CFG_MAGIC "OBP_RAW V1"
/* Registers */
#define MXT_INFO 0x00
#define MXT_FAMILY_ID 0x00
#define MXT_VARIANT_ID 0x01
#define MXT_VERSION 0x02
#define MXT_BUILD 0x03
#define MXT_MATRIX_X_SIZE 0x04
#define MXT_MATRIX_Y_SIZE 0x05
#define MXT_OBJECT_NUM 0x06
#define MXT_OBJECT_START 0x07
#define MXT_OBJECT_SIZE 6
#define MXT_INFO_CHECKSUM_SIZE 3
#define MXT_MAX_BLOCK_WRITE 256
/* Object types */
#define MXT_DEBUG_DIAGNOSTIC_T37 37
#define MXT_GEN_MESSAGE_T5 5
#define MXT_GEN_COMMAND_T6 6
#define MXT_GEN_POWER_T7 7
#define MXT_GEN_ACQUIRE_T8 8
#define MXT_GEN_DATASOURCE_T53 53
#define MXT_TOUCH_MULTI_T9 9
#define MXT_TOUCH_KEYARRAY_T15 15
#define MXT_TOUCH_PROXIMITY_T23 23
#define MXT_TOUCH_PROXKEY_T52 52
#define MXT_PROCI_GRIPFACE_T20 20
#define MXT_PROCG_NOISE_T22 22
#define MXT_PROCI_ONETOUCH_T24 24
#define MXT_PROCI_TWOTOUCH_T27 27
#define MXT_PROCI_GRIP_T40 40
#define MXT_PROCI_PALM_T41 41
#define MXT_PROCI_TOUCHSUPPRESSION_T42 42
#define MXT_PROCI_STYLUS_T47 47
#define MXT_PROCG_NOISESUPPRESSION_T48 48
#define MXT_SPT_COMMSCONFIG_T18 18
#define MXT_SPT_GPIOPWM_T19 19
#define MXT_SPT_SELFTEST_T25 25
#define MXT_SPT_CTECONFIG_T28 28
#define MXT_SPT_USERDATA_T38 38
#define MXT_SPT_DIGITIZER_T43 43
#define MXT_SPT_MESSAGECOUNT_T44 44
#define MXT_SPT_CTECONFIG_T46 46
/* MXT_GEN_MESSAGE_T5 object */
#define MXT_RPTID_NOMSG 0xff
/* MXT_GEN_COMMAND_T6 field */
#define MXT_COMMAND_RESET 0
#define MXT_COMMAND_BACKUPNV 1
#define MXT_COMMAND_CALIBRATE 2
#define MXT_COMMAND_REPORTALL 3
#define MXT_COMMAND_DIAGNOSTIC 5
/* Define for T6 status byte */
#define MXT_T6_STATUS_RESET (1 << 7)
#define MXT_T6_STATUS_OFL (1 << 6)
#define MXT_T6_STATUS_SIGERR (1 << 5)
#define MXT_T6_STATUS_CAL (1 << 4)
#define MXT_T6_STATUS_CFGERR (1 << 3)
#define MXT_T6_STATUS_COMSERR (1 << 2)
/* MXT_GEN_POWER_T7 field */
struct t7_config {
u8 idle;
u8 active;
} __packed;
#define MXT_POWER_CFG_RUN 0
#define MXT_POWER_CFG_DEEPSLEEP 1
/* MXT_GEN_ACQUIRE_T8 field */
#define MXT_ACQUIRE_CHRGTIME 0
#define MXT_ACQUIRE_TCHDRIFT 2
#define MXT_ACQUIRE_DRIFTST 3
#define MXT_ACQUIRE_TCHAUTOCAL 4
#define MXT_ACQUIRE_SYNC 5
#define MXT_ACQUIRE_ATCHCALST 6
#define MXT_ACQUIRE_ATCHCALSTHR 7
/* MXT_TOUCH_MULTI_T9 field */
#define MXT_T9_ORIENT 9
#define MXT_T9_RANGE 18
/* MXT_TOUCH_MULTI_T9 status */
#define MXT_T9_UNGRIP (1 << 0)
#define MXT_T9_SUPPRESS (1 << 1)
#define MXT_T9_AMP (1 << 2)
#define MXT_T9_VECTOR (1 << 3)
#define MXT_T9_MOVE (1 << 4)
#define MXT_T9_RELEASE (1 << 5)
#define MXT_T9_PRESS (1 << 6)
#define MXT_T9_DETECT (1 << 7)
struct t9_range {
u16 x;
u16 y;
} __packed;
/* MXT_TOUCH_MULTI_T9 orient */
#define MXT_T9_ORIENT_SWITCH (1 << 0)
/* MXT_PROCI_GRIPFACE_T20 field */
#define MXT_GRIPFACE_CTRL 0
#define MXT_GRIPFACE_XLOGRIP 1
#define MXT_GRIPFACE_XHIGRIP 2
#define MXT_GRIPFACE_YLOGRIP 3
#define MXT_GRIPFACE_YHIGRIP 4
#define MXT_GRIPFACE_MAXTCHS 5
#define MXT_GRIPFACE_SZTHR1 7
#define MXT_GRIPFACE_SZTHR2 8
#define MXT_GRIPFACE_SHPTHR1 9
#define MXT_GRIPFACE_SHPTHR2 10
#define MXT_GRIPFACE_SUPEXTTO 11
/* MXT_PROCI_NOISE field */
#define MXT_NOISE_CTRL 0
#define MXT_NOISE_OUTFLEN 1
#define MXT_NOISE_GCAFUL_LSB 3
#define MXT_NOISE_GCAFUL_MSB 4
#define MXT_NOISE_GCAFLL_LSB 5
#define MXT_NOISE_GCAFLL_MSB 6
#define MXT_NOISE_ACTVGCAFVALID 7
#define MXT_NOISE_NOISETHR 8
#define MXT_NOISE_FREQHOPSCALE 10
#define MXT_NOISE_FREQ0 11
#define MXT_NOISE_FREQ1 12
#define MXT_NOISE_FREQ2 13
#define MXT_NOISE_FREQ3 14
#define MXT_NOISE_FREQ4 15
#define MXT_NOISE_IDLEGCAFVALID 16
/* MXT_SPT_COMMSCONFIG_T18 */
#define MXT_COMMS_CTRL 0
#define MXT_COMMS_CMD 1
/* MXT_SPT_CTECONFIG_T28 field */
#define MXT_CTE_CTRL 0
#define MXT_CTE_CMD 1
#define MXT_CTE_MODE 2
#define MXT_CTE_IDLEGCAFDEPTH 3
#define MXT_CTE_ACTVGCAFDEPTH 4
#define MXT_CTE_VOLTAGE 5
#define MXT_VOLTAGE_DEFAULT 2700000
#define MXT_VOLTAGE_STEP 10000
/* Define for MXT_GEN_COMMAND_T6 */
#define MXT_BOOT_VALUE 0xa5
#define MXT_RESET_VALUE 0x01
#define MXT_BACKUP_VALUE 0x55
/* Delay times */
#define MXT_BACKUP_TIME 50 /* msec */
#define MXT_RESET_TIME 200 /* msec */
#define MXT_RESET_TIMEOUT 3000 /* msec */
#define MXT_CRC_TIMEOUT 1000 /* msec */
#define MXT_FW_RESET_TIME 3000 /* msec */
#define MXT_FW_CHG_TIMEOUT 300 /* msec */
/* Command to unlock bootloader */
#define MXT_UNLOCK_CMD_MSB 0xaa
#define MXT_UNLOCK_CMD_LSB 0xdc
/* Bootloader mode status */
#define MXT_WAITING_BOOTLOAD_CMD 0xc0 /* valid 7 6 bit only */
#define MXT_WAITING_FRAME_DATA 0x80 /* valid 7 6 bit only */
#define MXT_FRAME_CRC_CHECK 0x02
#define MXT_FRAME_CRC_FAIL 0x03
#define MXT_FRAME_CRC_PASS 0x04
#define MXT_APP_CRC_FAIL 0x40 /* valid 7 8 bit only */
#define MXT_BOOT_STATUS_MASK 0x3f
#define MXT_BOOT_EXTENDED_ID (1 << 5)
#define MXT_BOOT_ID_MASK 0x1f
/* Touchscreen absolute values */
#define MXT_MAX_AREA 0xff
#define MXT_PIXELS_PER_MM 20
struct mxt_info {
u8 family_id;
u8 variant_id;
u8 version;
u8 build;
u8 matrix_xsize;
u8 matrix_ysize;
u8 object_num;
};
struct mxt_object {
u8 type;
u16 start_address;
u8 size_minus_one;
u8 instances_minus_one;
u8 num_report_ids;
} __packed;
/* Each client has this additional data */
struct mxt_data {
struct i2c_client *client;
struct input_dev *input_dev;
char phys[64]; /* device physical location */
const struct mxt_platform_data *pdata;
struct mxt_object *object_table;
struct mxt_info info;
unsigned int irq;
unsigned int max_x;
unsigned int max_y;
bool in_bootloader;
u16 mem_size;
u8 max_reportid;
u32 config_crc;
u32 info_crc;
u8 bootloader_addr;
u8 *msg_buf;
u8 t6_status;
bool update_input;
u8 last_message_count;
u8 num_touchids;
struct t7_config t7_cfg;
/* Cached parameters from object table */
u16 T5_address;
u8 T5_msg_size;
u8 T6_reportid;
u16 T6_address;
u16 T7_address;
u8 T9_reportid_min;
u8 T9_reportid_max;
u8 T19_reportid;
u16 T44_address;
/* for fw update in bootloader */
struct completion bl_completion;
/* for reset handling */
struct completion reset_completion;
/* for config update handling */
struct completion crc_completion;
};
static size_t mxt_obj_size(const struct mxt_object *obj)
{
return obj->size_minus_one + 1;
}
static size_t mxt_obj_instances(const struct mxt_object *obj)
{
return obj->instances_minus_one + 1;
}
static bool mxt_object_readable(unsigned int type)
{
switch (type) {
case MXT_GEN_COMMAND_T6:
case MXT_GEN_POWER_T7:
case MXT_GEN_ACQUIRE_T8:
case MXT_GEN_DATASOURCE_T53:
case MXT_TOUCH_MULTI_T9:
case MXT_TOUCH_KEYARRAY_T15:
case MXT_TOUCH_PROXIMITY_T23:
case MXT_TOUCH_PROXKEY_T52:
case MXT_PROCI_GRIPFACE_T20:
case MXT_PROCG_NOISE_T22:
case MXT_PROCI_ONETOUCH_T24:
case MXT_PROCI_TWOTOUCH_T27:
case MXT_PROCI_GRIP_T40:
case MXT_PROCI_PALM_T41:
case MXT_PROCI_TOUCHSUPPRESSION_T42:
case MXT_PROCI_STYLUS_T47:
case MXT_PROCG_NOISESUPPRESSION_T48:
case MXT_SPT_COMMSCONFIG_T18:
case MXT_SPT_GPIOPWM_T19:
case MXT_SPT_SELFTEST_T25:
case MXT_SPT_CTECONFIG_T28:
case MXT_SPT_USERDATA_T38:
case MXT_SPT_DIGITIZER_T43:
case MXT_SPT_CTECONFIG_T46:
return true;
default:
return false;
}
}
static void mxt_dump_message(struct mxt_data *data, u8 *message)
{
dev_dbg(&data->client->dev, "message: %*ph\n",
data->T5_msg_size, message);
}
static int mxt_wait_for_completion(struct mxt_data *data,
struct completion *comp,
unsigned int timeout_ms)
{
struct device *dev = &data->client->dev;
unsigned long timeout = msecs_to_jiffies(timeout_ms);
long ret;
ret = wait_for_completion_interruptible_timeout(comp, timeout);
if (ret < 0) {
return ret;
} else if (ret == 0) {
dev_err(dev, "Wait for completion timed out.\n");
return -ETIMEDOUT;
}
return 0;
}
static int mxt_bootloader_read(struct mxt_data *data,
u8 *val, unsigned int count)
{
int ret;
struct i2c_msg msg;
msg.addr = data->bootloader_addr;
msg.flags = data->client->flags & I2C_M_TEN;
msg.flags |= I2C_M_RD;
msg.len = count;
msg.buf = val;
ret = i2c_transfer(data->client->adapter, &msg, 1);
if (ret == 1) {
ret = 0;
} else {
ret = ret < 0 ? ret : -EIO;
dev_err(&data->client->dev, "%s: i2c recv failed (%d)\n",
__func__, ret);
}
return ret;
}
static int mxt_bootloader_write(struct mxt_data *data,
const u8 * const val, unsigned int count)
{
int ret;
struct i2c_msg msg;
msg.addr = data->bootloader_addr;
msg.flags = data->client->flags & I2C_M_TEN;
msg.len = count;
msg.buf = (u8 *)val;
ret = i2c_transfer(data->client->adapter, &msg, 1);
if (ret == 1) {
ret = 0;
} else {
ret = ret < 0 ? ret : -EIO;
dev_err(&data->client->dev, "%s: i2c send failed (%d)\n",
__func__, ret);
}
return ret;
}
static int mxt_lookup_bootloader_address(struct mxt_data *data, bool retry)
{
u8 appmode = data->client->addr;
u8 bootloader;
switch (appmode) {
case 0x4a:
case 0x4b:
/* Chips after 1664S use different scheme */
if (retry || data->info.family_id >= 0xa2) {
bootloader = appmode - 0x24;
break;
}
/* Fall through for normal case */
case 0x4c:
case 0x4d:
case 0x5a:
case 0x5b:
bootloader = appmode - 0x26;
break;
default:
dev_err(&data->client->dev,
"Appmode i2c address 0x%02x not found\n",
appmode);
return -EINVAL;
}
data->bootloader_addr = bootloader;
return 0;
}
static int mxt_probe_bootloader(struct mxt_data *data, bool alt_address)
{
struct device *dev = &data->client->dev;
int error;
u8 val;
bool crc_failure;
error = mxt_lookup_bootloader_address(data, alt_address);
if (error)
return error;
error = mxt_bootloader_read(data, &val, 1);
if (error)
return error;
/* Check app crc fail mode */
crc_failure = (val & ~MXT_BOOT_STATUS_MASK) == MXT_APP_CRC_FAIL;
dev_err(dev, "Detected bootloader, status:%02X%s\n",
val, crc_failure ? ", APP_CRC_FAIL" : "");
return 0;
}
static u8 mxt_get_bootloader_version(struct mxt_data *data, u8 val)
{
struct device *dev = &data->client->dev;
u8 buf[3];
if (val & MXT_BOOT_EXTENDED_ID) {
if (mxt_bootloader_read(data, &buf[0], 3) != 0) {
dev_err(dev, "%s: i2c failure\n", __func__);
return val;
}
dev_dbg(dev, "Bootloader ID:%d Version:%d\n", buf[1], buf[2]);
return buf[0];
} else {
dev_dbg(dev, "Bootloader ID:%d\n", val & MXT_BOOT_ID_MASK);
return val;
}
}
static int mxt_check_bootloader(struct mxt_data *data, unsigned int state,
bool wait)
{
struct device *dev = &data->client->dev;
u8 val;
int ret;
recheck:
if (wait) {
/*
* In application update mode, the interrupt
* line signals state transitions. We must wait for the
* CHG assertion before reading the status byte.
* Once the status byte has been read, the line is deasserted.
*/
ret = mxt_wait_for_completion(data, &data->bl_completion,
MXT_FW_CHG_TIMEOUT);
if (ret) {
/*
* TODO: handle -ERESTARTSYS better by terminating
* fw update process before returning to userspace
* by writing length 0x000 to device (iff we are in
* WAITING_FRAME_DATA state).
*/
dev_err(dev, "Update wait error %d\n", ret);
return ret;
}
}
ret = mxt_bootloader_read(data, &val, 1);
if (ret)
return ret;
if (state == MXT_WAITING_BOOTLOAD_CMD)
val = mxt_get_bootloader_version(data, val);
switch (state) {
case MXT_WAITING_BOOTLOAD_CMD:
case MXT_WAITING_FRAME_DATA:
case MXT_APP_CRC_FAIL:
val &= ~MXT_BOOT_STATUS_MASK;
break;
case MXT_FRAME_CRC_PASS:
if (val == MXT_FRAME_CRC_CHECK) {
goto recheck;
} else if (val == MXT_FRAME_CRC_FAIL) {
dev_err(dev, "Bootloader CRC fail\n");
return -EINVAL;
}
break;
default:
return -EINVAL;
}
if (val != state) {
dev_err(dev, "Invalid bootloader state %02X != %02X\n",
val, state);
return -EINVAL;
}
return 0;
}
static int mxt_send_bootloader_cmd(struct mxt_data *data, bool unlock)
{
int ret;
u8 buf[2];
if (unlock) {
buf[0] = MXT_UNLOCK_CMD_LSB;
buf[1] = MXT_UNLOCK_CMD_MSB;
} else {
buf[0] = 0x01;
buf[1] = 0x01;
}
ret = mxt_bootloader_write(data, buf, 2);
if (ret)
return ret;
return 0;
}
static int __mxt_read_reg(struct i2c_client *client,
u16 reg, u16 len, void *val)
{
struct i2c_msg xfer[2];
u8 buf[2];
int ret;
buf[0] = reg & 0xff;
buf[1] = (reg >> 8) & 0xff;
/* Write register */
xfer[0].addr = client->addr;
xfer[0].flags = 0;
xfer[0].len = 2;
xfer[0].buf = buf;
/* Read data */
xfer[1].addr = client->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].len = len;
xfer[1].buf = val;
ret = i2c_transfer(client->adapter, xfer, 2);
if (ret == 2) {
ret = 0;
} else {
if (ret >= 0)
ret = -EIO;
dev_err(&client->dev, "%s: i2c transfer failed (%d)\n",
__func__, ret);
}
return ret;
}
static int __mxt_write_reg(struct i2c_client *client, u16 reg, u16 len,
const void *val)
{
u8 *buf;
size_t count;
int ret;
count = len + 2;
buf = kmalloc(count, GFP_KERNEL);
if (!buf)
return -ENOMEM;
buf[0] = reg & 0xff;
buf[1] = (reg >> 8) & 0xff;
memcpy(&buf[2], val, len);
ret = i2c_master_send(client, buf, count);
if (ret == count) {
ret = 0;
} else {
if (ret >= 0)
ret = -EIO;
dev_err(&client->dev, "%s: i2c send failed (%d)\n",
__func__, ret);
}
kfree(buf);
return ret;
}
static int mxt_write_reg(struct i2c_client *client, u16 reg, u8 val)
{
return __mxt_write_reg(client, reg, 1, &val);
}
static struct mxt_object *
mxt_get_object(struct mxt_data *data, u8 type)
{
struct mxt_object *object;
int i;
for (i = 0; i < data->info.object_num; i++) {
object = data->object_table + i;
if (object->type == type)
return object;
}
dev_warn(&data->client->dev, "Invalid object type T%u\n", type);
return NULL;
}
static void mxt_proc_t6_messages(struct mxt_data *data, u8 *msg)
{
struct device *dev = &data->client->dev;
u8 status = msg[1];
u32 crc = msg[2] | (msg[3] << 8) | (msg[4] << 16);
complete(&data->crc_completion);
if (crc != data->config_crc) {
data->config_crc = crc;
dev_dbg(dev, "T6 Config Checksum: 0x%06X\n", crc);
}
/* Detect reset */
if (status & MXT_T6_STATUS_RESET)
complete(&data->reset_completion);
/* Output debug if status has changed */
if (status != data->t6_status)
dev_dbg(dev, "T6 Status 0x%02X%s%s%s%s%s%s%s\n",
status,
status == 0 ? " OK" : "",
status & MXT_T6_STATUS_RESET ? " RESET" : "",
status & MXT_T6_STATUS_OFL ? " OFL" : "",
status & MXT_T6_STATUS_SIGERR ? " SIGERR" : "",
status & MXT_T6_STATUS_CAL ? " CAL" : "",
status & MXT_T6_STATUS_CFGERR ? " CFGERR" : "",
status & MXT_T6_STATUS_COMSERR ? " COMSERR" : "");
/* Save current status */
data->t6_status = status;
}
static void mxt_input_button(struct mxt_data *data, u8 *message)
{
struct input_dev *input = data->input_dev;
const struct mxt_platform_data *pdata = data->pdata;
bool button;
int i;
/* Active-low switch */
for (i = 0; i < pdata->t19_num_keys; i++) {
if (pdata->t19_keymap[i] == KEY_RESERVED)
continue;
button = !(message[1] & (1 << i));
input_report_key(input, pdata->t19_keymap[i], button);
}
}
static void mxt_input_sync(struct mxt_data *data)
{
input_mt_report_pointer_emulation(data->input_dev,
data->pdata->t19_num_keys);
input_sync(data->input_dev);
}
static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
{
struct device *dev = &data->client->dev;
struct input_dev *input_dev = data->input_dev;
int id;
u8 status;
int x;
int y;
int area;
int amplitude;
id = message[0] - data->T9_reportid_min;
status = message[1];
x = (message[2] << 4) | ((message[4] >> 4) & 0xf);
y = (message[3] << 4) | ((message[4] & 0xf));
/* Handle 10/12 bit switching */
if (data->max_x < 1024)
x >>= 2;
if (data->max_y < 1024)
y >>= 2;
area = message[5];
amplitude = message[6];
dev_dbg(dev,
"[%u] %c%c%c%c%c%c%c%c x: %5u y: %5u area: %3u amp: %3u\n",
id,
(status & MXT_T9_DETECT) ? 'D' : '.',
(status & MXT_T9_PRESS) ? 'P' : '.',
(status & MXT_T9_RELEASE) ? 'R' : '.',
(status & MXT_T9_MOVE) ? 'M' : '.',
(status & MXT_T9_VECTOR) ? 'V' : '.',
(status & MXT_T9_AMP) ? 'A' : '.',
(status & MXT_T9_SUPPRESS) ? 'S' : '.',
(status & MXT_T9_UNGRIP) ? 'U' : '.',
x, y, area, amplitude);
input_mt_slot(input_dev, id);
if (status & MXT_T9_DETECT) {
/*
* Multiple bits may be set if the host is slow to read
* the status messages, indicating all the events that
* have happened.
*/
if (status & MXT_T9_RELEASE) {
input_mt_report_slot_state(input_dev,
MT_TOOL_FINGER, 0);
mxt_input_sync(data);
}
/* Touch active */
input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, 1);
input_report_abs(input_dev, ABS_MT_POSITION_X, x);
input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
input_report_abs(input_dev, ABS_MT_PRESSURE, amplitude);
input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, area);
} else {
/* Touch no longer active, close out slot */
input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, 0);
}
data->update_input = true;
}
static int mxt_proc_message(struct mxt_data *data, u8 *message)
{
u8 report_id = message[0];
if (report_id == MXT_RPTID_NOMSG)
return 0;
if (report_id == data->T6_reportid) {
mxt_proc_t6_messages(data, message);
} else if (!data->input_dev) {
/*
* Do not report events if input device
* is not yet registered.
*/
mxt_dump_message(data, message);
} else if (report_id >= data->T9_reportid_min
&& report_id <= data->T9_reportid_max) {
mxt_proc_t9_message(data, message);
} else if (report_id == data->T19_reportid) {
mxt_input_button(data, message);
data->update_input = true;
} else {
mxt_dump_message(data, message);
}
return 1;
}
static int mxt_read_and_process_messages(struct mxt_data *data, u8 count)
{
struct device *dev = &data->client->dev;
int ret;
int i;
u8 num_valid = 0;
/* Safety check for msg_buf */
if (count > data->max_reportid)
return -EINVAL;
/* Process remaining messages if necessary */
ret = __mxt_read_reg(data->client, data->T5_address,
data->T5_msg_size * count, data->msg_buf);
if (ret) {
dev_err(dev, "Failed to read %u messages (%d)\n", count, ret);
return ret;
}
for (i = 0; i < count; i++) {
ret = mxt_proc_message(data,
data->msg_buf + data->T5_msg_size * i);
if (ret == 1)
num_valid++;
}
/* return number of messages read */
return num_valid;
}
static irqreturn_t mxt_process_messages_t44(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
int ret;
u8 count, num_left;
/* Read T44 and T5 together */
ret = __mxt_read_reg(data->client, data->T44_address,
data->T5_msg_size + 1, data->msg_buf);
if (ret) {
dev_err(dev, "Failed to read T44 and T5 (%d)\n", ret);
return IRQ_NONE;
}
count = data->msg_buf[0];
if (count == 0) {
/*
* This condition is caused by the CHG line being configured
* in Mode 0. It results in unnecessary I2C operations but it
* is benign.
*/
dev_dbg(dev, "Interrupt triggered but zero messages\n");
return IRQ_NONE;
} else if (count > data->max_reportid) {
dev_err(dev, "T44 count %d exceeded max report id\n", count);
count = data->max_reportid;
}
/* Process first message */
ret = mxt_proc_message(data, data->msg_buf + 1);
if (ret < 0) {
dev_warn(dev, "Unexpected invalid message\n");
return IRQ_NONE;
}
num_left = count - 1;
/* Process remaining messages if necessary */
if (num_left) {
ret = mxt_read_and_process_messages(data, num_left);
if (ret < 0)
goto end;
else if (ret != num_left)
dev_warn(dev, "Unexpected invalid message\n");
}
end:
if (data->update_input) {
mxt_input_sync(data);
data->update_input = false;
}
return IRQ_HANDLED;
}
static int mxt_process_messages_until_invalid(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
int count, read;
u8 tries = 2;
count = data->max_reportid;
/* Read messages until we force an invalid */
do {
read = mxt_read_and_process_messages(data, count);
if (read < count)
return 0;
} while (--tries);
if (data->update_input) {
mxt_input_sync(data);
data->update_input = false;
}
dev_err(dev, "CHG pin isn't cleared\n");
return -EBUSY;
}
static irqreturn_t mxt_process_messages(struct mxt_data *data)
{
int total_handled, num_handled;
u8 count = data->last_message_count;
if (count < 1 || count > data->max_reportid)
count = 1;
/* include final invalid message */
total_handled = mxt_read_and_process_messages(data, count + 1);
if (total_handled < 0)
return IRQ_NONE;
/* if there were invalid messages, then we are done */
else if (total_handled <= count)
goto update_count;
/* keep reading two msgs until one is invalid or reportid limit */
do {
num_handled = mxt_read_and_process_messages(data, 2);
if (num_handled < 0)
return IRQ_NONE;
total_handled += num_handled;
if (num_handled < 2)
break;
} while (total_handled < data->num_touchids);
update_count:
data->last_message_count = total_handled;
if (data->update_input) {
mxt_input_sync(data);
data->update_input = false;
}
return IRQ_HANDLED;
}
static irqreturn_t mxt_interrupt(int irq, void *dev_id)
{
struct mxt_data *data = dev_id;
if (data->in_bootloader) {
/* bootloader state transition completion */
complete(&data->bl_completion);
return IRQ_HANDLED;
}
if (!data->object_table)
return IRQ_HANDLED;
if (data->T44_address) {
return mxt_process_messages_t44(data);
} else {
return mxt_process_messages(data);
}
}
static int mxt_t6_command(struct mxt_data *data, u16 cmd_offset,
u8 value, bool wait)
{
u16 reg;
u8 command_register;
int timeout_counter = 0;
int ret;
reg = data->T6_address + cmd_offset;
ret = mxt_write_reg(data->client, reg, value);
if (ret)
return ret;
if (!wait)
return 0;
do {
msleep(20);
ret = __mxt_read_reg(data->client, reg, 1, &command_register);
if (ret)
return ret;
} while (command_register != 0 && timeout_counter++ <= 100);
if (timeout_counter > 100) {
dev_err(&data->client->dev, "Command failed!\n");
return -EIO;
}
return 0;
}
static int mxt_soft_reset(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
int ret = 0;
dev_info(dev, "Resetting chip\n");
reinit_completion(&data->reset_completion);
ret = mxt_t6_command(data, MXT_COMMAND_RESET, MXT_RESET_VALUE, false);
if (ret)
return ret;
ret = mxt_wait_for_completion(data, &data->reset_completion,
MXT_RESET_TIMEOUT);
if (ret)
return ret;
return 0;
}
static void mxt_update_crc(struct mxt_data *data, u8 cmd, u8 value)
{
/*
* On failure, CRC is set to 0 and config will always be
* downloaded.
*/
data->config_crc = 0;
reinit_completion(&data->crc_completion);
mxt_t6_command(data, cmd, value, true);
/*
* Wait for crc message. On failure, CRC is set to 0 and config will
* always be downloaded.
*/
mxt_wait_for_completion(data, &data->crc_completion, MXT_CRC_TIMEOUT);
}
static void mxt_calc_crc24(u32 *crc, u8 firstbyte, u8 secondbyte)
{
static const unsigned int crcpoly = 0x80001B;
u32 result;
u32 data_word;
data_word = (secondbyte << 8) | firstbyte;
result = ((*crc << 1) ^ data_word);
if (result & 0x1000000)
result ^= crcpoly;
*crc = result;
}
static u32 mxt_calculate_crc(u8 *base, off_t start_off, off_t end_off)
{
u32 crc = 0;
u8 *ptr = base + start_off;
u8 *last_val = base + end_off - 1;
if (end_off < start_off)
return -EINVAL;
while (ptr < last_val) {
mxt_calc_crc24(&crc, *ptr, *(ptr + 1));
ptr += 2;
}
/* if len is odd, fill the last byte with 0 */
if (ptr == last_val)
mxt_calc_crc24(&crc, *ptr, 0);
/* Mask to 24-bit */
crc &= 0x00FFFFFF;
return crc;
}
static int mxt_prepare_cfg_mem(struct mxt_data *data,
const struct firmware *cfg,
unsigned int data_pos,
unsigned int cfg_start_ofs,
u8 *config_mem,
size_t config_mem_size)
{
struct device *dev = &data->client->dev;
struct mxt_object *object;
unsigned int type, instance, size, byte_offset;
int offset;
int ret;
int i;
u16 reg;
u8 val;
while (data_pos < cfg->size) {
/* Read type, instance, length */
ret = sscanf(cfg->data + data_pos, "%x %x %x%n",
&type, &instance, &size, &offset);
if (ret == 0) {
/* EOF */
break;
} else if (ret != 3) {
dev_err(dev, "Bad format: failed to parse object\n");
return -EINVAL;
}
data_pos += offset;
object = mxt_get_object(data, type);
if (!object) {
/* Skip object */
for (i = 0; i < size; i++) {
ret = sscanf(cfg->data + data_pos, "%hhx%n",
&val, &offset);
if (ret != 1) {
dev_err(dev, "Bad format in T%d at %d\n",
type, i);
return -EINVAL;
}
data_pos += offset;
}
continue;
}
if (size > mxt_obj_size(object)) {
/*
* Either we are in fallback mode due to wrong
* config or config from a later fw version,
* or the file is corrupt or hand-edited.
*/
dev_warn(dev, "Discarding %zu byte(s) in T%u\n",
size - mxt_obj_size(object), type);
} else if (mxt_obj_size(object) > size) {
/*
* If firmware is upgraded, new bytes may be added to
* end of objects. It is generally forward compatible
* to zero these bytes - previous behaviour will be
* retained. However this does invalidate the CRC and
* will force fallback mode until the configuration is
* updated. We warn here but do nothing else - the
* malloc has zeroed the entire configuration.
*/
dev_warn(dev, "Zeroing %zu byte(s) in T%d\n",
mxt_obj_size(object) - size, type);
}
if (instance >= mxt_obj_instances(object)) {
dev_err(dev, "Object instances exceeded!\n");
return -EINVAL;
}
reg = object->start_address + mxt_obj_size(object) * instance;
for (i = 0; i < size; i++) {
ret = sscanf(cfg->data + data_pos, "%hhx%n",
&val,
&offset);
if (ret != 1) {
dev_err(dev, "Bad format in T%d at %d\n",
type, i);
return -EINVAL;
}
data_pos += offset;
if (i > mxt_obj_size(object))
continue;
byte_offset = reg + i - cfg_start_ofs;
if (byte_offset >= 0 && byte_offset < config_mem_size) {
*(config_mem + byte_offset) = val;
} else {
dev_err(dev, "Bad object: reg:%d, T%d, ofs=%d\n",
reg, object->type, byte_offset);
return -EINVAL;
}
}
}
return 0;
}
static int mxt_upload_cfg_mem(struct mxt_data *data, unsigned int cfg_start,
u8 *config_mem, size_t config_mem_size)
{
unsigned int byte_offset = 0;
int error;
/* Write configuration as blocks */
while (byte_offset < config_mem_size) {
unsigned int size = config_mem_size - byte_offset;
if (size > MXT_MAX_BLOCK_WRITE)
size = MXT_MAX_BLOCK_WRITE;
error = __mxt_write_reg(data->client,
cfg_start + byte_offset,
size, config_mem + byte_offset);
if (error) {
dev_err(&data->client->dev,
"Config write error, ret=%d\n", error);
return error;
}
byte_offset += size;
}
return 0;
}
/*
* mxt_update_cfg - download configuration to chip
*
* Atmel Raw Config File Format
*
* The first four lines of the raw config file contain:
* 1) Version
* 2) Chip ID Information (first 7 bytes of device memory)
* 3) Chip Information Block 24-bit CRC Checksum
* 4) Chip Configuration 24-bit CRC Checksum
*
* The rest of the file consists of one line per object instance:
* <TYPE> <INSTANCE> <SIZE> <CONTENTS>
*
* <TYPE> - 2-byte object type as hex
* <INSTANCE> - 2-byte object instance number as hex
* <SIZE> - 2-byte object size as hex
* <CONTENTS> - array of <SIZE> 1-byte hex values
*/
static int mxt_update_cfg(struct mxt_data *data, const struct firmware *cfg)
{
struct device *dev = &data->client->dev;
struct mxt_info cfg_info;
int ret;
int offset;
int data_pos;
int i;
int cfg_start_ofs;
u32 info_crc, config_crc, calculated_crc;
u8 *config_mem;
size_t config_mem_size;
mxt_update_crc(data, MXT_COMMAND_REPORTALL, 1);
if (strncmp(cfg->data, MXT_CFG_MAGIC, strlen(MXT_CFG_MAGIC))) {
dev_err(dev, "Unrecognised config file\n");
return -EINVAL;
}
data_pos = strlen(MXT_CFG_MAGIC);
/* Load information block and check */
for (i = 0; i < sizeof(struct mxt_info); i++) {
ret = sscanf(cfg->data + data_pos, "%hhx%n",
(unsigned char *)&cfg_info + i,
&offset);
if (ret != 1) {
dev_err(dev, "Bad format\n");
return -EINVAL;
}
data_pos += offset;
}
if (cfg_info.family_id != data->info.family_id) {
dev_err(dev, "Family ID mismatch!\n");
return -EINVAL;
}
if (cfg_info.variant_id != data->info.variant_id) {
dev_err(dev, "Variant ID mismatch!\n");
return -EINVAL;
}
/* Read CRCs */
ret = sscanf(cfg->data + data_pos, "%x%n", &info_crc, &offset);
if (ret != 1) {
dev_err(dev, "Bad format: failed to parse Info CRC\n");
return -EINVAL;
}
data_pos += offset;
ret = sscanf(cfg->data + data_pos, "%x%n", &config_crc, &offset);
if (ret != 1) {
dev_err(dev, "Bad format: failed to parse Config CRC\n");
return -EINVAL;
}
data_pos += offset;
/*
* The Info Block CRC is calculated over mxt_info and the object
* table. If it does not match then we are trying to load the
* configuration from a different chip or firmware version, so
* the configuration CRC is invalid anyway.
*/
if (info_crc == data->info_crc) {
if (config_crc == 0 || data->config_crc == 0) {
dev_info(dev, "CRC zero, attempting to apply config\n");
} else if (config_crc == data->config_crc) {
dev_dbg(dev, "Config CRC 0x%06X: OK\n",
data->config_crc);
return 0;
} else {
dev_info(dev, "Config CRC 0x%06X: does not match file 0x%06X\n",
data->config_crc, config_crc);
}
} else {
dev_warn(dev,
"Warning: Info CRC error - device=0x%06X file=0x%06X\n",
data->info_crc, info_crc);
}
/* Malloc memory to store configuration */
cfg_start_ofs = MXT_OBJECT_START +
data->info.object_num * sizeof(struct mxt_object) +
MXT_INFO_CHECKSUM_SIZE;
config_mem_size = data->mem_size - cfg_start_ofs;
config_mem = kzalloc(config_mem_size, GFP_KERNEL);
if (!config_mem) {
dev_err(dev, "Failed to allocate memory\n");
return -ENOMEM;
}
ret = mxt_prepare_cfg_mem(data, cfg, data_pos, cfg_start_ofs,
config_mem, config_mem_size);
if (ret)
goto release_mem;
/* Calculate crc of the received configs (not the raw config file) */
if (data->T7_address < cfg_start_ofs) {
dev_err(dev, "Bad T7 address, T7addr = %x, config offset %x\n",
data->T7_address, cfg_start_ofs);
ret = 0;
goto release_mem;
}
calculated_crc = mxt_calculate_crc(config_mem,
data->T7_address - cfg_start_ofs,
config_mem_size);
if (config_crc > 0 && config_crc != calculated_crc)
dev_warn(dev, "Config CRC error, calculated=%06X, file=%06X\n",
calculated_crc, config_crc);
ret = mxt_upload_cfg_mem(data, cfg_start_ofs,
config_mem, config_mem_size);
if (ret)
goto release_mem;
mxt_update_crc(data, MXT_COMMAND_BACKUPNV, MXT_BACKUP_VALUE);
ret = mxt_soft_reset(data);
if (ret)
goto release_mem;
dev_info(dev, "Config successfully updated\n");
release_mem:
kfree(config_mem);
return ret;
}
static int mxt_acquire_irq(struct mxt_data *data)
{
int error;
enable_irq(data->irq);
error = mxt_process_messages_until_invalid(data);
if (error)
return error;
return 0;
}
static int mxt_get_info(struct mxt_data *data)
{
struct i2c_client *client = data->client;
struct mxt_info *info = &data->info;
int error;
/* Read 7-byte info block starting at address 0 */
error = __mxt_read_reg(client, MXT_INFO, sizeof(*info), info);
if (error)
return error;
return 0;
}
static void mxt_free_input_device(struct mxt_data *data)
{
if (data->input_dev) {
input_unregister_device(data->input_dev);
data->input_dev = NULL;
}
}
static void mxt_free_object_table(struct mxt_data *data)
{
kfree(data->object_table);
data->object_table = NULL;
kfree(data->msg_buf);
data->msg_buf = NULL;
data->T5_address = 0;
data->T5_msg_size = 0;
data->T6_reportid = 0;
data->T7_address = 0;
data->T9_reportid_min = 0;
data->T9_reportid_max = 0;
data->T19_reportid = 0;
data->T44_address = 0;
data->max_reportid = 0;
}
static int mxt_get_object_table(struct mxt_data *data)
{
struct i2c_client *client = data->client;
size_t table_size;
struct mxt_object *object_table;
int error;
int i;
u8 reportid;
u16 end_address;
table_size = data->info.object_num * sizeof(struct mxt_object);
object_table = kzalloc(table_size, GFP_KERNEL);
if (!object_table) {
dev_err(&data->client->dev, "Failed to allocate memory\n");
return -ENOMEM;
}
error = __mxt_read_reg(client, MXT_OBJECT_START, table_size,
object_table);
if (error) {
kfree(object_table);
return error;
}
/* Valid Report IDs start counting from 1 */
reportid = 1;
data->mem_size = 0;
for (i = 0; i < data->info.object_num; i++) {
struct mxt_object *object = object_table + i;
u8 min_id, max_id;
le16_to_cpus(&object->start_address);
if (object->num_report_ids) {
min_id = reportid;
reportid += object->num_report_ids *
mxt_obj_instances(object);
max_id = reportid - 1;
} else {
min_id = 0;
max_id = 0;
}
dev_dbg(&data->client->dev,
"T%u Start:%u Size:%zu Instances:%zu Report IDs:%u-%u\n",
object->type, object->start_address,
mxt_obj_size(object), mxt_obj_instances(object),
min_id, max_id);
switch (object->type) {
case MXT_GEN_MESSAGE_T5:
if (data->info.family_id == 0x80 &&
data->info.version < 0x20) {
/*
* On mXT224 firmware versions prior to V2.0
* read and discard unused CRC byte otherwise
* DMA reads are misaligned.
*/
data->T5_msg_size = mxt_obj_size(object);
} else {
/* CRC not enabled, so skip last byte */
data->T5_msg_size = mxt_obj_size(object) - 1;
}
data->T5_address = object->start_address;
break;
case MXT_GEN_COMMAND_T6:
data->T6_reportid = min_id;
data->T6_address = object->start_address;
break;
case MXT_GEN_POWER_T7:
data->T7_address = object->start_address;
break;
case MXT_TOUCH_MULTI_T9:
data->T9_reportid_min = min_id;
data->T9_reportid_max = max_id;
data->num_touchids = object->num_report_ids
* mxt_obj_instances(object);
break;
case MXT_SPT_MESSAGECOUNT_T44:
data->T44_address = object->start_address;
break;
case MXT_SPT_GPIOPWM_T19:
data->T19_reportid = min_id;
break;
}
end_address = object->start_address
+ mxt_obj_size(object) * mxt_obj_instances(object) - 1;
if (end_address >= data->mem_size)
data->mem_size = end_address + 1;
}
/* Store maximum reportid */
data->max_reportid = reportid;
/* If T44 exists, T5 position has to be directly after */
if (data->T44_address && (data->T5_address != data->T44_address + 1)) {
dev_err(&client->dev, "Invalid T44 position\n");
error = -EINVAL;
goto free_object_table;
}
data->msg_buf = kcalloc(data->max_reportid,
data->T5_msg_size, GFP_KERNEL);
if (!data->msg_buf) {
dev_err(&client->dev, "Failed to allocate message buffer\n");
error = -ENOMEM;
goto free_object_table;
}
data->object_table = object_table;
return 0;
free_object_table:
mxt_free_object_table(data);
return error;
}
static int mxt_read_t9_resolution(struct mxt_data *data)
{
struct i2c_client *client = data->client;
int error;
struct t9_range range;
unsigned char orient;
struct mxt_object *object;
object = mxt_get_object(data, MXT_TOUCH_MULTI_T9);
if (!object)
return -EINVAL;
error = __mxt_read_reg(client,
object->start_address + MXT_T9_RANGE,
sizeof(range), &range);
if (error)
return error;
le16_to_cpus(&range.x);
le16_to_cpus(&range.y);
error = __mxt_read_reg(client,
object->start_address + MXT_T9_ORIENT,
1, &orient);
if (error)
return error;
/* Handle default values */
if (range.x == 0)
range.x = 1023;
if (range.y == 0)
range.y = 1023;
if (orient & MXT_T9_ORIENT_SWITCH) {
data->max_x = range.y;
data->max_y = range.x;
} else {
data->max_x = range.x;
data->max_y = range.y;
}
dev_dbg(&client->dev,
"Touchscreen size X%uY%u\n", data->max_x, data->max_y);
return 0;
}
static int mxt_input_open(struct input_dev *dev);
static void mxt_input_close(struct input_dev *dev);
static int mxt_initialize_t9_input_device(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
const struct mxt_platform_data *pdata = data->pdata;
struct input_dev *input_dev;
int error;
unsigned int num_mt_slots;
unsigned int mt_flags = 0;
int i;
error = mxt_read_t9_resolution(data);
if (error)
dev_warn(dev, "Failed to initialize T9 resolution\n");
input_dev = input_allocate_device();
if (!input_dev) {
dev_err(dev, "Failed to allocate memory\n");
return -ENOMEM;
}
input_dev->name = "Atmel maXTouch Touchscreen";
input_dev->phys = data->phys;
input_dev->id.bustype = BUS_I2C;
input_dev->dev.parent = dev;
input_dev->open = mxt_input_open;
input_dev->close = mxt_input_close;
__set_bit(EV_ABS, input_dev->evbit);
__set_bit(EV_KEY, input_dev->evbit);
__set_bit(BTN_TOUCH, input_dev->keybit);
if (pdata->t19_num_keys) {
__set_bit(INPUT_PROP_BUTTONPAD, input_dev->propbit);
for (i = 0; i < pdata->t19_num_keys; i++)
if (pdata->t19_keymap[i] != KEY_RESERVED)
input_set_capability(input_dev, EV_KEY,
pdata->t19_keymap[i]);
mt_flags |= INPUT_MT_POINTER;
input_abs_set_res(input_dev, ABS_X, MXT_PIXELS_PER_MM);
input_abs_set_res(input_dev, ABS_Y, MXT_PIXELS_PER_MM);
input_abs_set_res(input_dev, ABS_MT_POSITION_X,
MXT_PIXELS_PER_MM);
input_abs_set_res(input_dev, ABS_MT_POSITION_Y,
MXT_PIXELS_PER_MM);
input_dev->name = "Atmel maXTouch Touchpad";
}
/* For single touch */
input_set_abs_params(input_dev, ABS_X,
0, data->max_x, 0, 0);
input_set_abs_params(input_dev, ABS_Y,
0, data->max_y, 0, 0);
input_set_abs_params(input_dev, ABS_PRESSURE,
0, 255, 0, 0);
/* For multi touch */
num_mt_slots = data->T9_reportid_max - data->T9_reportid_min + 1;
error = input_mt_init_slots(input_dev, num_mt_slots, mt_flags);
if (error) {
dev_err(dev, "Error %d initialising slots\n", error);
goto err_free_mem;
}
input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
0, MXT_MAX_AREA, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_X,
0, data->max_x, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
0, data->max_y, 0, 0);
input_set_abs_params(input_dev, ABS_MT_PRESSURE,
0, 255, 0, 0);
input_set_drvdata(input_dev, data);
error = input_register_device(input_dev);
if (error) {
dev_err(dev, "Error %d registering input device\n", error);
goto err_free_mem;
}
data->input_dev = input_dev;
return 0;
err_free_mem:
input_free_device(input_dev);
return error;
}
static int mxt_configure_objects(struct mxt_data *data,
const struct firmware *cfg);
static void mxt_config_cb(const struct firmware *cfg, void *ctx)
{
mxt_configure_objects(ctx, cfg);
release_firmware(cfg);
}
static int mxt_initialize(struct mxt_data *data)
{
struct i2c_client *client = data->client;
int recovery_attempts = 0;
int error;
while (1) {
error = mxt_get_info(data);
if (!error)
break;
/* Check bootloader state */
error = mxt_probe_bootloader(data, false);
if (error) {
dev_info(&client->dev, "Trying alternate bootloader address\n");
error = mxt_probe_bootloader(data, true);
if (error) {
/* Chip is not in appmode or bootloader mode */
return error;
}
}
/* OK, we are in bootloader, see if we can recover */
if (++recovery_attempts > 1) {
dev_err(&client->dev, "Could not recover from bootloader mode\n");
/*
* We can reflash from this state, so do not
* abort initialization.
*/
data->in_bootloader = true;
return 0;
}
/* Attempt to exit bootloader into app mode */
mxt_send_bootloader_cmd(data, false);
msleep(MXT_FW_RESET_TIME);
}
/* Get object table information */
error = mxt_get_object_table(data);
if (error) {
dev_err(&client->dev, "Error %d reading object table\n", error);
return error;
}
error = mxt_acquire_irq(data);
if (error)
goto err_free_object_table;
error = request_firmware_nowait(THIS_MODULE, true, MXT_CFG_NAME,
&client->dev, GFP_KERNEL, data,
mxt_config_cb);
if (error) {
dev_err(&client->dev, "Failed to invoke firmware loader: %d\n",
error);
goto err_free_object_table;
}
return 0;
err_free_object_table:
mxt_free_object_table(data);
return error;
}
static int mxt_set_t7_power_cfg(struct mxt_data *data, u8 sleep)
{
struct device *dev = &data->client->dev;
int error;
struct t7_config *new_config;
struct t7_config deepsleep = { .active = 0, .idle = 0 };
if (sleep == MXT_POWER_CFG_DEEPSLEEP)
new_config = &deepsleep;
else
new_config = &data->t7_cfg;
error = __mxt_write_reg(data->client, data->T7_address,
sizeof(data->t7_cfg), new_config);
if (error)
return error;
dev_dbg(dev, "Set T7 ACTV:%d IDLE:%d\n",
new_config->active, new_config->idle);
return 0;
}
static int mxt_init_t7_power_cfg(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
int error;
bool retry = false;
recheck:
error = __mxt_read_reg(data->client, data->T7_address,
sizeof(data->t7_cfg), &data->t7_cfg);
if (error)
return error;
if (data->t7_cfg.active == 0 || data->t7_cfg.idle == 0) {
if (!retry) {
dev_dbg(dev, "T7 cfg zero, resetting\n");
mxt_soft_reset(data);
retry = true;
goto recheck;
} else {
dev_dbg(dev, "T7 cfg zero after reset, overriding\n");
data->t7_cfg.active = 20;
data->t7_cfg.idle = 100;
return mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
}
}
dev_dbg(dev, "Initialized power cfg: ACTV %d, IDLE %d\n",
data->t7_cfg.active, data->t7_cfg.idle);
return 0;
}
static int mxt_configure_objects(struct mxt_data *data,
const struct firmware *cfg)
{
struct device *dev = &data->client->dev;
struct mxt_info *info = &data->info;
int error;
if (cfg) {
error = mxt_update_cfg(data, cfg);
if (error)
dev_warn(dev, "Error %d updating config\n", error);
}
error = mxt_init_t7_power_cfg(data);
if (error) {
dev_err(dev, "Failed to initialize power cfg\n");
return error;
}
error = mxt_initialize_t9_input_device(data);
if (error)
return error;
dev_info(dev,
"Family: %u Variant: %u Firmware V%u.%u.%02X Objects: %u\n",
info->family_id, info->variant_id, info->version >> 4,
info->version & 0xf, info->build, info->object_num);
return 0;
}
/* Firmware Version is returned as Major.Minor.Build */
static ssize_t mxt_fw_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mxt_data *data = dev_get_drvdata(dev);
struct mxt_info *info = &data->info;
return scnprintf(buf, PAGE_SIZE, "%u.%u.%02X\n",
info->version >> 4, info->version & 0xf, info->build);
}
/* Hardware Version is returned as FamilyID.VariantID */
static ssize_t mxt_hw_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mxt_data *data = dev_get_drvdata(dev);
struct mxt_info *info = &data->info;
return scnprintf(buf, PAGE_SIZE, "%u.%u\n",
info->family_id, info->variant_id);
}
static ssize_t mxt_show_instance(char *buf, int count,
struct mxt_object *object, int instance,
const u8 *val)
{
int i;
if (mxt_obj_instances(object) > 1)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Instance %u\n", instance);
for (i = 0; i < mxt_obj_size(object); i++)
count += scnprintf(buf + count, PAGE_SIZE - count,
"\t[%2u]: %02x (%d)\n", i, val[i], val[i]);
count += scnprintf(buf + count, PAGE_SIZE - count, "\n");
return count;
}
static ssize_t mxt_object_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mxt_data *data = dev_get_drvdata(dev);
struct mxt_object *object;
int count = 0;
int i, j;
int error;
u8 *obuf;
/* Pre-allocate buffer large enough to hold max sized object. */
obuf = kmalloc(256, GFP_KERNEL);
if (!obuf)
return -ENOMEM;
error = 0;
for (i = 0; i < data->info.object_num; i++) {
object = data->object_table + i;
if (!mxt_object_readable(object->type))
continue;
count += scnprintf(buf + count, PAGE_SIZE - count,
"T%u:\n", object->type);
for (j = 0; j < mxt_obj_instances(object); j++) {
u16 size = mxt_obj_size(object);
u16 addr = object->start_address + j * size;
error = __mxt_read_reg(data->client, addr, size, obuf);
if (error)
goto done;
count = mxt_show_instance(buf, count, object, j, obuf);
}
}
done:
kfree(obuf);
return error ?: count;
}
static int mxt_check_firmware_format(struct device *dev,
const struct firmware *fw)
{
unsigned int pos = 0;
char c;
while (pos < fw->size) {
c = *(fw->data + pos);
if (c < '0' || (c > '9' && c < 'A') || c > 'F')
return 0;
pos++;
}
/*
* To convert file try:
* xxd -r -p mXTXXX__APP_VX-X-XX.enc > maxtouch.fw
*/
dev_err(dev, "Aborting: firmware file must be in binary format\n");
return -EINVAL;
}
static int mxt_load_fw(struct device *dev, const char *fn)
{
struct mxt_data *data = dev_get_drvdata(dev);
const struct firmware *fw = NULL;
unsigned int frame_size;
unsigned int pos = 0;
unsigned int retry = 0;
unsigned int frame = 0;
int ret;
ret = request_firmware(&fw, fn, dev);
if (ret) {
dev_err(dev, "Unable to open firmware %s\n", fn);
return ret;
}
/* Check for incorrect enc file */
ret = mxt_check_firmware_format(dev, fw);
if (ret)
goto release_firmware;
if (!data->in_bootloader) {
/* Change to the bootloader mode */
data->in_bootloader = true;
ret = mxt_t6_command(data, MXT_COMMAND_RESET,
MXT_BOOT_VALUE, false);
if (ret)
goto release_firmware;
msleep(MXT_RESET_TIME);
/* Do not need to scan since we know family ID */
ret = mxt_lookup_bootloader_address(data, 0);
if (ret)
goto release_firmware;
mxt_free_input_device(data);
mxt_free_object_table(data);
} else {
enable_irq(data->irq);
}
reinit_completion(&data->bl_completion);
ret = mxt_check_bootloader(data, MXT_WAITING_BOOTLOAD_CMD, false);
if (ret) {
/* Bootloader may still be unlocked from previous attempt */
ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA, false);
if (ret)
goto disable_irq;
} else {
dev_info(dev, "Unlocking bootloader\n");
/* Unlock bootloader */
ret = mxt_send_bootloader_cmd(data, true);
if (ret)
goto disable_irq;
}
while (pos < fw->size) {
ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA, true);
if (ret)
goto disable_irq;
frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1));
/* Take account of CRC bytes */
frame_size += 2;
/* Write one frame to device */
ret = mxt_bootloader_write(data, fw->data + pos, frame_size);
if (ret)
goto disable_irq;
ret = mxt_check_bootloader(data, MXT_FRAME_CRC_PASS, true);
if (ret) {
retry++;
/* Back off by 20ms per retry */
msleep(retry * 20);
if (retry > 20) {
dev_err(dev, "Retry count exceeded\n");
goto disable_irq;
}
} else {
retry = 0;
pos += frame_size;
frame++;
}
if (frame % 50 == 0)
dev_dbg(dev, "Sent %d frames, %d/%zd bytes\n",
frame, pos, fw->size);
}
/* Wait for flash. */
ret = mxt_wait_for_completion(data, &data->bl_completion,
MXT_FW_RESET_TIME);
if (ret)
goto disable_irq;
dev_dbg(dev, "Sent %d frames, %d bytes\n", frame, pos);
/*
* Wait for device to reset. Some bootloader versions do not assert
* the CHG line after bootloading has finished, so ignore potential
* errors.
*/
mxt_wait_for_completion(data, &data->bl_completion, MXT_FW_RESET_TIME);
data->in_bootloader = false;
disable_irq:
disable_irq(data->irq);
release_firmware:
release_firmware(fw);
return ret;
}
static ssize_t mxt_update_fw_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct mxt_data *data = dev_get_drvdata(dev);
int error;
error = mxt_load_fw(dev, MXT_FW_NAME);
if (error) {
dev_err(dev, "The firmware update failed(%d)\n", error);
count = error;
} else {
dev_info(dev, "The firmware update succeeded\n");
error = mxt_initialize(data);
if (error)
return error;
}
return count;
}
static DEVICE_ATTR(fw_version, S_IRUGO, mxt_fw_version_show, NULL);
static DEVICE_ATTR(hw_version, S_IRUGO, mxt_hw_version_show, NULL);
static DEVICE_ATTR(object, S_IRUGO, mxt_object_show, NULL);
static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mxt_update_fw_store);
static struct attribute *mxt_attrs[] = {
&dev_attr_fw_version.attr,
&dev_attr_hw_version.attr,
&dev_attr_object.attr,
&dev_attr_update_fw.attr,
NULL
};
static const struct attribute_group mxt_attr_group = {
.attrs = mxt_attrs,
};
static void mxt_start(struct mxt_data *data)
{
mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
/* Recalibrate since chip has been in deep sleep */
mxt_t6_command(data, MXT_COMMAND_CALIBRATE, 1, false);
}
static void mxt_stop(struct mxt_data *data)
{
mxt_set_t7_power_cfg(data, MXT_POWER_CFG_DEEPSLEEP);
}
static int mxt_input_open(struct input_dev *dev)
{
struct mxt_data *data = input_get_drvdata(dev);
mxt_start(data);
return 0;
}
static void mxt_input_close(struct input_dev *dev)
{
struct mxt_data *data = input_get_drvdata(dev);
mxt_stop(data);
}
#ifdef CONFIG_OF
static struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client)
{
struct mxt_platform_data *pdata;
u32 *keymap;
u32 keycode;
int proplen, i, ret;
if (!client->dev.of_node)
return ERR_PTR(-ENODEV);
pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
if (of_find_property(client->dev.of_node, "linux,gpio-keymap",
&proplen)) {
pdata->t19_num_keys = proplen / sizeof(u32);
keymap = devm_kzalloc(&client->dev,
pdata->t19_num_keys * sizeof(keymap[0]),
GFP_KERNEL);
if (!keymap)
return ERR_PTR(-ENOMEM);
for (i = 0; i < pdata->t19_num_keys; i++) {
ret = of_property_read_u32_index(client->dev.of_node,
"linux,gpio-keymap", i, &keycode);
if (ret)
keycode = KEY_RESERVED;
keymap[i] = keycode;
}
pdata->t19_keymap = keymap;
}
return pdata;
}
#else
static struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client)
{
dev_dbg(&client->dev, "No platform data specified\n");
return ERR_PTR(-EINVAL);
}
#endif
static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct mxt_data *data;
const struct mxt_platform_data *pdata;
int error;
pdata = dev_get_platdata(&client->dev);
if (!pdata) {
pdata = mxt_parse_dt(client);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
}
data = kzalloc(sizeof(struct mxt_data), GFP_KERNEL);
if (!data) {
dev_err(&client->dev, "Failed to allocate memory\n");
return -ENOMEM;
}
snprintf(data->phys, sizeof(data->phys), "i2c-%u-%04x/input0",
client->adapter->nr, client->addr);
data->client = client;
data->pdata = pdata;
data->irq = client->irq;
i2c_set_clientdata(client, data);
init_completion(&data->bl_completion);
init_completion(&data->reset_completion);
init_completion(&data->crc_completion);
error = request_threaded_irq(client->irq, NULL, mxt_interrupt,
pdata->irqflags | IRQF_ONESHOT,
client->name, data);
if (error) {
dev_err(&client->dev, "Failed to register interrupt\n");
goto err_free_mem;
}
disable_irq(client->irq);
error = mxt_initialize(data);
if (error)
goto err_free_irq;
error = sysfs_create_group(&client->dev.kobj, &mxt_attr_group);
if (error) {
dev_err(&client->dev, "Failure %d creating sysfs group\n",
error);
goto err_free_object;
}
return 0;
err_free_object:
mxt_free_input_device(data);
mxt_free_object_table(data);
err_free_irq:
free_irq(client->irq, data);
err_free_mem:
kfree(data);
return error;
}
static int mxt_remove(struct i2c_client *client)
{
struct mxt_data *data = i2c_get_clientdata(client);
sysfs_remove_group(&client->dev.kobj, &mxt_attr_group);
free_irq(data->irq, data);
mxt_free_input_device(data);
mxt_free_object_table(data);
kfree(data);
return 0;
}
static int __maybe_unused mxt_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct mxt_data *data = i2c_get_clientdata(client);
struct input_dev *input_dev = data->input_dev;
mutex_lock(&input_dev->mutex);
if (input_dev->users)
mxt_stop(data);
mutex_unlock(&input_dev->mutex);
return 0;
}
static int __maybe_unused mxt_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct mxt_data *data = i2c_get_clientdata(client);
struct input_dev *input_dev = data->input_dev;
mutex_lock(&input_dev->mutex);
if (input_dev->users)
mxt_start(data);
mutex_unlock(&input_dev->mutex);
return 0;
}
static SIMPLE_DEV_PM_OPS(mxt_pm_ops, mxt_suspend, mxt_resume);
static const struct of_device_id mxt_of_match[] = {
{ .compatible = "atmel,maxtouch", },
{},
};
MODULE_DEVICE_TABLE(of, mxt_of_match);
static const struct i2c_device_id mxt_id[] = {
{ "qt602240_ts", 0 },
{ "atmel_mxt_ts", 0 },
{ "atmel_mxt_tp", 0 },
{ "mXT224", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, mxt_id);
static struct i2c_driver mxt_driver = {
.driver = {
.name = "atmel_mxt_ts",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(mxt_of_match),
.pm = &mxt_pm_ops,
},
.probe = mxt_probe,
.remove = mxt_remove,
.id_table = mxt_id,
};
module_i2c_driver(mxt_driver);
/* Module information */
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_DESCRIPTION("Atmel maXTouch Touchscreen driver");
MODULE_LICENSE("GPL");
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