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|
//[*]--------------------------------------------------------------------------------------------------[*]
//
//
//
// I2C Touchscreen driver
// 2012.01.17
//
//
//[*]--------------------------------------------------------------------------------------------------[*]
#include <linux/device.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/hrtimer.h>
#include <asm/unaligned.h>
#include <linux/firmware.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
//[*]--------------------------------------------------------------------------------------------------[*]
#if defined(CONFIG_HAS_EARLYSUSPEND)
#include <linux/wakelock.h>
#include <linux/earlysuspend.h>
#include <linux/suspend.h>
#endif
//[*]--------------------------------------------------------------------------------------------------[*]
#include <linux/input/touch-pdata.h>
#include <linux/input/odroidq-touch.h>
#include "touch.h"
#include "odroidq-config.h"
//[*]--------------------------------------------------------------------------------------------------[*]
//#define DEBUG_TOUCH
#define DEBUG_TOUCH_KEY
//[*]--------------------------------------------------------------------------------------------------[*]
// function prototype define
//[*]--------------------------------------------------------------------------------------------------[*]
// Touch data processing function
//[*]--------------------------------------------------------------------------------------------------[*]
static void odroidq_sw_config (struct touch *ts);
static void odroidq_fifo_clear (struct touch *ts);
void odroidq_work (struct touch *ts);
int odroidq_calibration (struct touch *ts);
int odroidq_i2c_read (struct i2c_client *client, unsigned char *cmd, unsigned int cmd_len, unsigned char *data, unsigned int len);
void odroidq_enable (struct touch *ts);
void odroidq_disable (struct touch *ts);
int odroidq_early_probe (struct touch *ts);
int odroidq_probe (struct touch *ts);
#ifdef CONFIG_HAS_EARLYSUSPEND
void odroidq_suspend (struct early_suspend *h);
void odroidq_resume (struct early_suspend *h);
#endif
//[*]--------------------------------------------------------------------------------------------------[*]
//
// i2c control function
//
//[*]--------------------------------------------------------------------------------------------------[*]
int odroidq_i2c_read(struct i2c_client *client, unsigned char *cmd, unsigned int cmd_len, unsigned char *data, unsigned int len)
{
struct i2c_msg msg[2];
int ret;
unsigned char temp[10];
unsigned char i;
if((len == 0) || (data == NULL)) {
dev_err(&client->dev, "I2C read error: Null pointer or length == 0\n");
return -1;
}
memset(msg, 0x00, sizeof(msg));
msg[0].addr = client->addr;
msg[0].flags = 0;
msg[0].len = cmd_len;
msg[0].buf = cmd;
msg[1].addr = client->addr;
msg[1].flags = I2C_M_RD;
msg[1].len = len;
msg[1].buf = temp;
if ((ret = i2c_transfer(client->adapter, msg, 2)) != 2) {
dev_err(&client->dev, "I2C read error: (%d) reg: 0x%X len: %d\n", ret, cmd[0], len);
return -EIO;
}
if(len) {
for(i = 0; i < len; i++) data[i] = temp[len - i -1];
}
return len;
}
//[*]--------------------------------------------------------------------------------------------------[*]
int odroidq_calibration (struct touch *ts)
{
if(ts->pdata->reset_gpio) gpio_set_value(ts->pdata->reset_gpio, ts->pdata->reset_level); mdelay(10);
if(ts->pdata->reset_gpio) gpio_set_value(ts->pdata->reset_gpio, ts->pdata->reset_level ? 0 : 1); mdelay(10);
odroidq_sw_config(ts); odroidq_fifo_clear(ts);
return 0;
}
//[*]--------------------------------------------------------------------------------------------------[*]
//
// Touch data processing function
//
//[*]--------------------------------------------------------------------------------------------------[*]
static void odroidq_sw_config (struct touch *ts)
{
unsigned char i, wdata[2], cmd;
for(i = 0; i < sizeof(Config) / sizeof(Config[0]); i++)
{
wdata[0] = Config[i].Data1; wdata[1] = Config[i].Data2;
cmd = Config[i].Reg;
if(Config[i].No == 0xFF) mdelay(cmd);
else {
ts->pdata->i2c_write(ts->client, (unsigned char *)&cmd, sizeof(cmd), &wdata[0], Config[i].No);
}
}
mdelay(10);
}
//[*]--------------------------------------------------------------------------------------------------[*]
static void odroidq_fifo_clear (struct touch *ts)
{
unsigned char wdata = 0x01, cmd = EVENT_FIFO_SCLR;
ts->pdata->i2c_write(ts->client, (unsigned char *)&cmd, sizeof(cmd), (unsigned char *)&wdata, sizeof(wdata)); // clear Event FiFo
}
//[*]--------------------------------------------------------------------------------------------------[*]
static unsigned char odroidq_id_tracking (struct touch *ts, unsigned char find_id)
{
unsigned char i, find_slot = 0xFF;
for(i = 0; i < ts->pdata->max_fingers; i++) {
if(ts->finger[i].id == find_id) find_slot = i;
if((ts->finger[i].event == TS_EVENT_UNKNOWN) && (find_slot == 0xFF)) find_slot = i;
}
return find_slot;
}
//[*]--------------------------------------------------------------------------------------------------[*]
#if defined(SOFT_AVR_FILTER_ENABLE)
typedef struct soft_filter__t {
unsigned int x[SOFT_AVR_COUNT];
unsigned int y[SOFT_AVR_COUNT];
unsigned int pos, cnt;
} __attribute__ ((packed)) soft_filter_t;
static soft_filter_t *pSoftFilter;
static unsigned char odroidq_soft_avr_filter(struct touch *ts, event_stack_u *event_stack, unsigned char find_slot)
{
unsigned int i, x, y;
if(ts->finger[find_slot].event != TS_EVENT_MOVE) {
pSoftFilter[find_slot].pos = 0; pSoftFilter[find_slot].cnt = 0;
return true;
}
x = (((event_stack->bits.msb_x << 8) & 0xF00) | event_stack->bits.lsb_x);
y = (((event_stack->bits.msb_y << 8) & 0xF00) | event_stack->bits.lsb_y);
if(y > 15) y -= 15;
else y = 1;
ts->finger[find_slot].id = event_stack->bits.number + 1;
ts->finger[find_slot].pressure =
(unsigned int)(event_stack->bits.pressure);
if(pSoftFilter[find_slot].cnt == 1) {
if((abs(pSoftFilter[find_slot].x[0] - x) < SOFT_AVR_MOVE_TOL_X) &&
(abs(pSoftFilter[find_slot].y[0] - y) < SOFT_AVR_MOVE_TOL_Y)) return false;
}
if(event_stack->bits.speed < SOFT_AVR_ENABLE_SPEED) {
pSoftFilter[find_slot].x[pSoftFilter[find_slot].pos] = x;
pSoftFilter[find_slot].y[pSoftFilter[find_slot].pos] = y;
pSoftFilter[find_slot].pos++; pSoftFilter[find_slot].pos %= SOFT_AVR_COUNT;
if(pSoftFilter[find_slot].cnt < SOFT_AVR_COUNT) pSoftFilter[find_slot].cnt++;
for(i = 0, x = 0, y = 0; i < pSoftFilter[find_slot].cnt; i++) {
x += pSoftFilter[find_slot].x[i]; y += pSoftFilter[find_slot].y[i];
}
ts->finger[find_slot].x = x / pSoftFilter[find_slot].cnt;
ts->finger[find_slot].y = y / pSoftFilter[find_slot].cnt;
}
else {
pSoftFilter[find_slot].pos = 0; pSoftFilter[find_slot].cnt = 0;
ts->finger[find_slot].x = x; ts->finger[find_slot].y = y;
}
return true;
}
#endif // #if defined(SOFT_AVR_FILTER_ENABLE)
//[*]--------------------------------------------------------------------------------------------------[*]
void odroidq_work (struct touch *ts)
{
status_u status;
button_u button;
event_stack_u event_stack;
unsigned char cmd, find_slot;
cmd = TOUCH_STATUS;
if(ts->pdata->i2c_read(ts->client, (unsigned char *)&cmd, sizeof(cmd), (unsigned char *)&status.byte[0], sizeof(status_u)) < 0) return;
if(ts->pdata->keycode) {
cmd = BUTTON_STATUS;
if(ts->pdata->i2c_read(ts->client, (unsigned char *)&cmd, sizeof(cmd), (unsigned char *)&button.ubyte, sizeof(button_u)) < 0) return;
ts->pdata->key_report(ts, button.ubyte);
}
if(status.bits.fifo_overflow || status.bits.large_object || status.bits.abnomal_status) {
printk("[Error Status] fifo_overflow(%d), large_object(%d), abnomal_status(%d)\n" , status.bits.fifo_overflow
, status.bits.large_object
, status.bits.abnomal_status);
// Error reconfig
ts->pdata->disable(ts); ts->pdata->enable(ts);
return;
}
do {
cmd = EVENT_STACK;
ts->pdata->i2c_read(ts->client, (unsigned char *)&cmd, sizeof(cmd), (unsigned char *)&event_stack.byte[0], sizeof(event_stack_u));
if(status.bits.fifo_valid) {
if((find_slot = odroidq_id_tracking(ts, event_stack.bits.number + 1)) == 0xFF) {
printk("ERROR(%s) : Empty slot not found", __func__); continue;
}
if((event_stack.bits.event != EVENT_UNKNOWN) && (event_stack.bits.number < ts->pdata->max_fingers)) {
if((event_stack.bits.event == EVENT_PRESS) || (event_stack.bits.event == EVENT_MOVE)) {
ts->finger[find_slot].status = true;
ts->finger[find_slot].event = TS_EVENT_MOVE;
#if defined(SOFT_AVR_FILTER_ENABLE)
ts->finger[find_slot].status = odroidq_soft_avr_filter(ts, &event_stack, find_slot);
#else
ts->finger[find_slot].id = event_stack.bits.number + 1;
ts->finger[find_slot].x =
(unsigned int)(((event_stack.bits.msb_x << 8) & 0xF00) | event_stack.bits.lsb_x);
ts->finger[find_slot].y =
(unsigned int)(((event_stack.bits.msb_y << 8) & 0xF00) | event_stack.bits.lsb_y);
if(ts->finger[find_slot].y > 15) ts->finger[find_slot].y -= 15;
else ts->finger[find_slot].y = 1;
ts->finger[find_slot].pressure =
(unsigned int)(event_stack.bits.pressure);
#endif
}
else {
if(ts->finger[find_slot].event == TS_EVENT_MOVE) {
ts->finger[find_slot].status = true;
ts->finger[find_slot].event = TS_EVENT_RELEASE;
}
else {
ts->finger[find_slot].status = false;
ts->finger[find_slot].event = TS_EVENT_UNKNOWN;
}
#if defined(SOFT_AVR_FILTER_ENABLE)
odroidq_soft_avr_filter(ts, &event_stack, find_slot);
#endif
}
ts->pdata->report(ts);
}
}
} while(!gpio_get_value(ts->pdata->irq_gpio));
}
//[*]--------------------------------------------------------------------------------------------------[*]
void odroidq_enable (struct touch *ts)
{
if(ts->disabled) {
odroidq_calibration(ts);
enable_irq(ts->irq); ts->disabled = false;
}
}
//[*]--------------------------------------------------------------------------------------------------[*]
void odroidq_disable (struct touch *ts)
{
if(!ts->disabled) {
disable_irq(ts->irq); ts->disabled = true;
if(ts->pdata->event_clear) ts->pdata->event_clear(ts);
if(ts->pdata->reset_gpio) gpio_set_value(ts->pdata->reset_gpio, ts->pdata->reset_level);
}
}
//[*]--------------------------------------------------------------------------------------------------[*]
int odroidq_early_probe (struct touch *ts)
{
#if defined(SOFT_AVR_FILTER_ENABLE)
if(ts->pdata->max_fingers) {
if(!(pSoftFilter = kzalloc(sizeof(soft_filter_t) * ts->pdata->max_fingers, GFP_KERNEL))) {
printk("touch soft-filter struct malloc error!\n"); return -ENOMEM;
}
}
#endif
odroidq_calibration(ts);
return 0;
}
//[*]--------------------------------------------------------------------------------------------------[*]
int odroidq_probe (struct touch *ts)
{
int ret;
unsigned short rd;
unsigned char cmd;
// Get Touch screen information
cmd = DEVICE_ID; rd = 0;
ret = ts->pdata->i2c_read(ts->client, (unsigned char *)&cmd, sizeof(cmd), (unsigned char *)&rd, sizeof(rd));
#if defined(DEBUG_TOUCH) // 0x2533
printk("DEVICE ID = 0x%04X\n", rd);
#endif
cmd = VERSION_ID; rd = 0;
ret = ts->pdata->i2c_read(ts->client, (unsigned char *)&cmd, sizeof(cmd), (unsigned char *)&rd, sizeof(rd));
#if defined(DEBUG_TOUCH)
printk("VERSION = 0x%04X\n", rd);
#endif
ts->fw_version = ((rd >> 8) & 0xFF) * 100 + (rd & 0xFF);
return ret;
}
//[*]--------------------------------------------------------------------------------------------------[*]
//[*]--------------------------------------------------------------------------------------------------[*]
MODULE_AUTHOR("HardKernel Co., Ltd.");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Touchscreen Driver");
//[*]--------------------------------------------------------------------------------------------------[*]
//[*]--------------------------------------------------------------------------------------------------[*]
|
