/*
* clearpad_tm1217.c - Touch Screen driver for Synaptics Clearpad
* TM1217 controller
*
* Copyright (C) 2008 Intel Corp
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; ifnot, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* Questions/Comments/Bug fixes to Ramesh Agarwal (ramesh.agarwal@intel.com)
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/timer.h>
#include <linux/gpio.h>
#include <linux/hrtimer.h>
#include <linux/kthread.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include "cp_tm1217.h"
#define CPTM1217_DEVICE_NAME "cptm1217"
#define CPTM1217_DRIVER_NAME CPTM1217_DEVICE_NAME
#define MAX_TOUCH_SUPPORTED 2
#define TOUCH_SUPPORTED 1
#define SAMPLING_FREQ 80 /* Frequency in HZ */
#define DELAY_BTWIN_SAMPLE (1000 / SAMPLING_FREQ)
#define WAIT_FOR_RESPONSE 5 /* 5msec just works */
#define MAX_RETRIES 5 /* As above */
#define INCREMENTAL_DELAY 5 /* As above */
/* Regster Definitions */
#define TMA1217_DEV_STATUS 0x13 /* Device Status */
#define TMA1217_INT_STATUS 0x14 /* Interrupt Status */
/* Controller can detect up to 2 possible finger touches.
* Each finger touch provides 12 bit X Y co-ordinates, the values are split
* across 2 registers, and an 8 bit Z value */
#define TMA1217_FINGER_STATE 0x18 /* Finger State */
#define TMA1217_FINGER1_X_HIGHER8 0x19 /* Higher 8 bit of X coordinate */
#define TMA1217_FINGER1_Y_HIGHER8 0x1A /* Higher 8 bit of Y coordinate */
#define TMA1217_FINGER1_XY_LOWER4 0x1B /* Lower 4 bits of X and Y */
#define TMA1217_FINGER1_Z_VALUE 0x1D /* 8 bit Z value for finger 1 */
#define TMA1217_FINGER2_X_HIGHER8 0x1E /* Higher 8 bit of X coordinate */
#define TMA1217_FINGER2_Y_HIGHER8 0x1F /* Higher 8 bit of Y coordinate */
#define TMA1217_FINGER2_XY_LOWER4 0x20 /* Lower 4 bits of X and Y */
#define TMA1217_FINGER2_Z_VALUE 0x22 /* 8 bit Z value for finger 2 */
#define TMA1217_DEVICE_CTRL 0x23 /* Device Control */
#define TMA1217_INTERRUPT_ENABLE 0x24 /* Interrupt Enable */
#define TMA1217_REPORT_MODE 0x2B /* Reporting Mode */
#define TMA1217_MAX_X_LOWER8 0x31 /* Bit 0-7 for Max X */
#define TMA1217_MAX_X_HIGHER4 0x32 /* Bit 8-11 for Max X */
#define TMA1217_MAX_Y_LOWER8 0x33 /* Bit 0-7 for Max Y */
#define TMA1217_MAX_Y_HIGHER4 0x34 /* Bit 8-11 for Max Y */
#define TMA1217_DEVICE_CMD_RESET 0x67 /* Device CMD reg for reset */
#define TMA1217_DEVICE_CMD_REZERO 0x69 /* Device CMD reg for rezero */
#define TMA1217_MANUFACTURER_ID 0x73 /* Manufacturer Id */
#define TMA1217_PRODUCT_FAMILY 0x75 /* Product Family */
#define TMA1217_FIRMWARE_REVISION 0x76 /* Firmware Revision */
#define TMA1217_SERIAL_NO_HIGH 0x7C /* Bit 8-15 of device serial no. */
#define TMA1217_SERIAL_NO_LOW 0x7D /* Bit 0-7 of device serial no. */
#define TMA1217_PRODUCT_ID_START 0x7E /* Start address for 10 byte ID */
#define TMA1217_DEVICE_CAPABILITY 0x8B /* Reporting capability */
/*
* The touch position structure.
*/
struct touch_state {
int x;
int y;
bool button;
};
/* Device Specific info given by the controller */
struct cp_dev_info {
u16 maxX;
u16 maxY;
};
/* Vendor related info given by the controller */
struct cp_vendor_info {
u8 vendor_id;
u8 product_family;
u8 firmware_rev;
u16 serial_no;
};
/*
* Private structure to store the device details
*/
struct cp_tm1217_device {
struct i2c_client *client;
struct device *dev;
struct cp_vendor_info vinfo;
struct cp_dev_info dinfo;
struct input_dev_info {
char phys[32];
char name[128];
struct input_dev *input;
struct touch_state touch;
} cp_input_info[MAX_TOUCH_SUPPORTED];
int thread_running;
struct mutex thread_mutex;
int gpio;
};
/* The following functions are used to read/write registers on the device
* as per the RMI prorocol. Technically, a page select should be written
* before doing read/write but since the register offsets are below 0xFF
* we can use the default value of page which is 0x00
*/
static int cp_tm1217_read(struct cp_tm1217_device *ts,
u8 *req, int size)
{
int i, retval;
/* Send the address */
retval = i2c_master_send(ts->client, &req[0], 1);
if (retval != 1) {
dev_err(ts->dev, "cp_tm1217: I2C send failed\n");
return retval;
}
msleep(WAIT_FOR_RESPONSE);
for (i = 0; i < MAX_RETRIES; i++) {
retval = i2c_master_recv(ts->client, &req[1], size);
if (retval == size) {
break;
} else {
msleep(INCREMENTAL_DELAY);
dev_dbg(ts->dev, "cp_tm1217: Retry count is %d\n", i);
}
}
if (retval != size)
dev_err(ts->dev, "cp_tm1217: Read from device failed\n");
return retval;
}
static int cp_tm1217_write(struct cp_tm1217_device *ts,
u8 *req, int size)
{
int retval;
/* Send the address and the data to be written */
retval = i2c_master_send(ts->client, &req[0], size + 1);
if (retval != size + 1) {
dev_err(ts->dev, "cp_tm1217: I2C write failed: %d\n", retval);
return retval;
}
/* Wait for the write to complete. TBD why this is required */
msleep(WAIT_FOR_RESPONSE);
return size;
}
static int cp_tm1217_mask_interrupt(struct cp_tm1217_device *ts)
{
u8 req[2];
int retval;
req[0] = TMA1217_INTERRUPT_ENABLE;
req[1] = 0x0;
retval = cp_tm1217_write(ts, req, 1);
if (retval != 1)
return -EIO;
return 0;
}
static int cp_tm1217_unmask_interrupt(struct cp_tm1217_device *ts)
{
u8 req[2];
int retval;
req[0] = TMA1217_INTERRUPT_ENABLE;
req[1] = 0xa;
retval = cp_tm1217_write(ts, req, 1);
if (retval != 1)
return -EIO;
return 0;
}
static void process_touch(struct cp_tm1217_device *ts, int index)
{
int retval;
struct input_dev_info *input_info =
(struct input_dev_info *)&ts->cp_input_info[index];
u8 xy_data[6];
if (index == 0)
xy_data[0] = TMA1217_FINGER1_X_HIGHER8;
else
xy_data[0] = TMA1217_FINGER2_X_HIGHER8;
retval = cp_tm1217_read(ts, xy_data, 5);
if (retval < 5) {
dev_err(ts->dev, "cp_tm1217: XY read from device failed\n");
return;
}
/* Note: Currently not using the Z values but may be requried in
the future. */
input_info->touch.x = (xy_data[1] << 4)
| (xy_data[3] & 0x0F);
input_info->touch.y = (xy_data[2] << 4)
| ((xy_data[3] & 0xF0) >> 4);
input_report_abs(input_info->input, ABS_X, input_info->touch.x);
input_report_abs(input_info->input, ABS_Y, input_info->touch.y);
input_sync(input_info->input);
}
static void cp_tm1217_get_data(struct cp_tm1217_device *ts)
{
u8 req[2];
int retval, i, finger_touched = 0;
do {
req[0] = TMA1217_FINGER_STATE;
retval = cp_tm1217_read(ts, req, 1);
if (retval != 1) {
dev_err(ts->dev,
"cp_tm1217: Read from device failed\n");
continue;
}
finger_touched = 0;
/* Start sampling until the pressure is below
threshold */
for (i = 0; i < TOUCH_SUPPORTED; i++) {
if (req[1] & 0x3) {
finger_touched++;
if (ts->cp_input_info[i].touch.button == 0) {
/* send the button touch event */
input_report_key(
ts->cp_input_info[i].input,
BTN_TOUCH, 1);
ts->cp_input_info[i].touch.button = 1;
}
process_touch(ts, i);
} else {
if (ts->cp_input_info[i].touch.button == 1) {
/* send the button release event */
input_report_key(
ts->cp_input_info[i].input,
BTN_TOUCH, 0);
input_sync(ts->cp_input_info[i].input);
ts->cp_input_info[i].touch.button = 0;
}
}
req[1] = req[1] >> 2;
}
msleep(DELAY_BTWIN_SAMPLE);
} while (finger_touched > 0);
}
static irqreturn_t cp_tm1217_sample_thread(int irq, void *handle)
{
struct cp_tm1217_device *ts = (struct cp_tm1217_device *) handle;
u8 req[2];
int retval;
/* Chedk if another thread is already running */
mutex_lock(&ts->thread_mutex);
if (ts->thread_running == 1) {
mutex_unlock(&ts->thread_mutex);
return IRQ_HANDLED;
} else {
ts->thread_running = 1;
mutex_unlock(&ts->thread_mutex);
}
/* Mask the interrupts */
retval = cp_tm1217_mask_interrupt(ts);
/* Read the Interrupt Status register to find the cause of the
Interrupt */
req[0] = TMA1217_INT_STATUS;
retval = cp_tm1217_read(ts, req, 1);
if (retval != 1)
goto exit_thread;
if (!(req[1] & 0x8))
goto exit_thread;
cp_tm1217_get_data(ts);
exit_thread:
/* Unmask the interrupts before going to sleep */
retval = cp_tm1217_unmask_interrupt(ts);
mutex_lock(&ts->thread_mutex);
ts->thread_running = 0;
mutex_unlock(&ts->thread_mutex);
return IRQ_HANDLED;
}
static int cp_tm1217_init_data(struct cp_tm1217_device *ts)
{
int retval;
u8 req[2];
/* Read the vendor id/ fw revision etc. Ignoring return check as this
is non critical info */
req[0] = TMA1217_MANUFACTURER_ID;
retval = cp_tm1217_read(ts, req, 1);
ts->vinfo.vendor_id = req[1];
req[0] = TMA1217_PRODUCT_FAMILY;
retval = cp_tm1217_read(ts, req, 1);
ts->vinfo.product_family = req[1];
req[0] = TMA1217_FIRMWARE_REVISION;
retval = cp_tm1217_read(ts, req, 1);
ts->vinfo.firmware_rev = req[1];
req[0] = TMA1217_SERIAL_NO_HIGH;
retval = cp_tm1217_read(ts, req, 1);
ts->vinfo.serial_no = (req[1] << 8);
req[0] = TMA1217_SERIAL_NO_LOW;
retval = cp_tm1217_read(ts, req, 1);
ts->vinfo.serial_no = ts->vinfo.serial_no | req[1];
req[0] = TMA1217_MAX_X_HIGHER4;
retval = cp_tm1217_read(ts, req, 1);
ts->dinfo.maxX = (req[1] & 0xF) << 8;
req[0] = TMA1217_MAX_X_LOWER8;
retval = cp_tm1217_read(ts, req, 1);
ts->dinfo.maxX = ts->dinfo.maxX | req[1];
req[0] = TMA1217_MAX_Y_HIGHER4;
retval = cp_tm1217_read(ts, req, 1);
ts->dinfo.maxY = (req[1] & 0xF) << 8;
req[0] = TMA1217_MAX_Y_LOWER8;
retval = cp_tm1217_read(ts, req, 1);
ts->dinfo.maxY = ts->dinfo.maxY | req[1];
return 0;
}
/*
* Set up a GPIO for use as the interrupt. We can't simply do this at
* boot time because the GPIO drivers themselves may not be around at
* boot/firmware set up time to do the work. Instead defer it to driver
* detection.
*/
static int cp_tm1217_setup_gpio_irq(struct cp_tm1217_device *ts)
{
int retval;
/* Hook up the irq handler */
retval = gpio_request(ts->gpio, "cp_tm1217_touch");
if (retval < 0) {
dev_err(ts->dev, "cp_tm1217: GPIO request failed error %d\n",
retval);
return retval;
}
retval = gpio_direction_input(ts->gpio);
if (retval < 0) {
dev_err(ts->dev,
"cp_tm1217: GPIO direction configuration failed, error %d\n",
retval);
gpio_free(ts->gpio);
return retval;
}
retval = gpio_to_irq(ts->gpio);
if (retval < 0) {
dev_err(ts->dev, "cp_tm1217: GPIO to IRQ failedi,"
" error %d\n", retval);
gpio_free(ts->gpio);
}
dev_dbg(ts->dev,
"cp_tm1217: Got IRQ number is %d for GPIO %d\n",
retval, ts->gpio);
return retval;
}
static int cp_tm1217_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct cp_tm1217_device *ts;
struct input_dev *input_dev;
struct input_dev_info *input_info;
struct cp_tm1217_platform_data *pdata;
u8 req[2];
int i, retval;
/* No pdata is fine - we then use "normal" IRQ mode */
pdata = client->dev.platform_data;
ts = kzalloc(sizeof(struct cp_tm1217_device), GFP_KERNEL);
if (!ts) {
dev_err(&client->dev,
"cp_tm1217: Private Device Struct alloc failed\n");
return -ENOMEM;
}
ts->client = client;
ts->dev = &client->dev;
i2c_set_clientdata(client, ts);
ts->thread_running = 0;
mutex_init(&ts->thread_mutex);
/* Reset the Controller */
req[0] = TMA1217_DEVICE_CMD_RESET;
req[1] = 0x1;
retval = cp_tm1217_write(ts, req, 1);
if (retval != 1) {
dev_err(ts->dev, "cp_tm1217: Controller reset failed\n");
kfree(ts);
return -EIO;
}
/* Clear up the interrupt status from reset. */
req[0] = TMA1217_INT_STATUS;
retval = cp_tm1217_read(ts, req, 1);
/* Mask all the interrupts */
retval = cp_tm1217_mask_interrupt(ts);
/* Read the controller information */
cp_tm1217_init_data(ts);
/* The following code will register multiple event devices when
multi-pointer is enabled, the code has not been tested
with MPX */
for (i = 0; i < TOUCH_SUPPORTED; i++) {
input_dev = input_allocate_device();
if (input_dev == NULL) {
dev_err(ts->dev,
"cp_tm1217:Input Device Struct alloc failed\n");
retval = -ENOMEM;
goto fail;
}
input_info = &ts->cp_input_info[i];
snprintf(input_info->name, sizeof(input_info->name),
"cp_tm1217_touchscreen_%d", i);
input_dev->name = input_info->name;
snprintf(input_info->phys, sizeof(input_info->phys),
"%s/input%d", dev_name(&client->dev), i);
input_dev->phys = input_info->phys;
input_dev->id.bustype = BUS_I2C;
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
input_set_abs_params(input_dev, ABS_X, 0, ts->dinfo.maxX, 0, 0);
input_set_abs_params(input_dev, ABS_Y, 0, ts->dinfo.maxY, 0, 0);
retval = input_register_device(input_dev);
if (retval) {
dev_err(ts->dev,
"Input dev registration failed for %s\n",
input_dev->name);
input_free_device(input_dev);
goto fail;
}
input_info->input = input_dev;
}
/* Setup the reporting mode to send an interrupt only when
finger arrives or departs. */
req[0] = TMA1217_REPORT_MODE;
req[1] = 0x02;
retval = cp_tm1217_write(ts, req, 1);
/* Setup the device to no sleep mode for now and make it configured */
req[0] = TMA1217_DEVICE_CTRL;
req[1] = 0x84;
retval = cp_tm1217_write(ts, req, 1);
/* Check for the status of the device */
req[0] = TMA1217_DEV_STATUS;
retval = cp_tm1217_read(ts, req, 1);
if (req[1] != 0) {
dev_err(ts->dev,
"cp_tm1217: Device Status 0x%x != 0: config failed\n",
req[1]);
retval = -EIO;
goto fail;
}
if (pdata && pdata->gpio) {
ts->gpio = pdata->gpio;
retval = cp_tm1217_setup_gpio_irq(ts);
} else
retval = client->irq;
if (retval < 0) {
dev_err(ts->dev, "cp_tm1217: GPIO request failed error %d\n",
retval);
goto fail;
}
client->irq = retval;
retval = request_threaded_irq(client->irq,
NULL, cp_tm1217_sample_thread,
IRQF_TRIGGER_FALLING, "cp_tm1217_touch", ts);
if (retval < 0) {
dev_err(ts->dev, "cp_tm1217: Request IRQ error %d\n", retval);
goto fail_gpio;
}
/* Unmask the interrupts */
retval = cp_tm1217_unmask_interrupt(ts);
if (retval == 0)
return 0;
free_irq(client->irq, ts);
fail_gpio:
if (ts->gpio)
gpio_free(ts->gpio);
fail:
/* Clean up before returning failure */
for (i = 0; i < TOUCH_SUPPORTED; i++) {
if (ts->cp_input_info[i].input) {
input_unregister_device(ts->cp_input_info[i].input);
input_free_device(ts->cp_input_info[i].input);
}
}
kfree(ts);
return retval;
}
/*
* cp_tm1217 suspend
*
*/
static int cp_tm1217_suspend(struct i2c_client *client, pm_message_t mesg)
{
struct cp_tm1217_device *ts = i2c_get_clientdata(client);
u8 req[2];
int retval;
/* Put the controller to sleep */
req[0] = TMA1217_DEVICE_CTRL;
retval = cp_tm1217_read(ts, req, 1);
req[1] = (req[1] & 0xF8) | 0x1;
retval = cp_tm1217_write(ts, req, 1);
if (device_may_wakeup(&client->dev))
enable_irq_wake(client->irq);
return 0;
}
/*
* cp_tm1217_resume
*
*/
static int cp_tm1217_resume(struct i2c_client *client)
{
struct cp_tm1217_device *ts = i2c_get_clientdata(client);
u8 req[2];
int retval;
/* Take the controller out of sleep */
req[0] = TMA1217_DEVICE_CTRL;
retval = cp_tm1217_read(ts, req, 1);
req[1] = (req[1] & 0xF8) | 0x4;
retval = cp_tm1217_write(ts, req, 1);
/* Restore the register settings sinc the power to the
could have been cut off */
/* Setup the reporting mode to send an interrupt only when
finger arrives or departs. */
req[0] = TMA1217_REPORT_MODE;
req[1] = 0x02;
retval = cp_tm1217_write(ts, req, 1);
/* Setup the device to no sleep mode for now and make it configured */
req[0] = TMA1217_DEVICE_CTRL;
req[1] = 0x84;
retval = cp_tm1217_write(ts, req, 1);
/* Setup the interrupt mask */
retval = cp_tm1217_unmask_interrupt(ts);
if (device_may_wakeup(&client->dev))
disable_irq_wake(client->irq);
return 0;
}
/*
* cp_tm1217_remove
*
*/
static int cp_tm1217_remove(struct i2c_client *client)
{
struct cp_tm1217_device *ts = i2c_get_clientdata(client);
int i;
free_irq(client->irq, ts);
if (ts->gpio)
gpio_free(ts->gpio);
for (i = 0; i < TOUCH_SUPPORTED; i++)
input_unregister_device(ts->cp_input_info[i].input);
kfree(ts);
return 0;
}
static struct i2c_device_id cp_tm1217_idtable[] = {
{ CPTM1217_DEVICE_NAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, cp_tm1217_idtable);
static struct i2c_driver cp_tm1217_driver = {
.driver = {
.owner = THIS_MODULE,
.name = CPTM1217_DRIVER_NAME,
},
.id_table = cp_tm1217_idtable,
.probe = cp_tm1217_probe,
.remove = cp_tm1217_remove,
.suspend = cp_tm1217_suspend,
.resume = cp_tm1217_resume,
};
static int __init clearpad_tm1217_init(void)
{
return i2c_add_driver(&cp_tm1217_driver);
}
static void __exit clearpad_tm1217_exit(void)
{
i2c_del_driver(&cp_tm1217_driver);
}
module_init(clearpad_tm1217_init);
module_exit(clearpad_tm1217_exit);
MODULE_AUTHOR("Ramesh Agarwal <ramesh.agarwal@intel.com>");
MODULE_DESCRIPTION("Synaptics TM1217 TouchScreen Driver");
MODULE_LICENSE("GPL v2");