3 * Touch Screen I2C Driver for EETI Controller
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
17 // Release Date: 2010/11/08
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/interrupt.h>
23 #include <linux/wait.h>
24 #include <linux/delay.h>
25 #include <linux/platform_device.h>
26 #include <linux/freezer.h>
27 #include <linux/proc_fs.h>
28 #include <linux/clk.h>
29 #include <linux/i2c.h>
30 #include <linux/gpio.h>
31 #include <linux/device.h>
32 #include <linux/cdev.h>
34 #include <asm/system.h>
35 #include <asm/uaccess.h>
36 #include <linux/poll.h>
37 #include <linux/kfifo.h>
38 #include <linux/version.h>
39 #include <linux/input.h>
40 #include <linux/input/mt.h>
41 #include <linux/irq.h>
42 #include <linux/async.h>
43 #include <mach/board.h>
45 #ifdef CONFIG_HAS_EARLYSUSPEND
46 #include <linux/earlysuspend.h>
50 #ifdef CONFIG_EETI_EGALAX_DEBUG
51 #define TS_DEBUG(fmt,args...) printk( KERN_DEBUG "[egalax_i2c]: " fmt, ## args)
52 #define DBG() printk("[%s]:%d => \n",__FUNCTION__,__LINE__)
54 #define TS_DEBUG(fmt,args...)
58 //#define _NON_INPUT_DEV // define this to disable register input device
60 static int global_major = 0; // dynamic major by default
61 static int global_minor = 0;
62 #define EETI_I2C_RATE (200*1000)
63 #define MAX_I2C_LEN 10
64 #define FIFO_SIZE PAGE_SIZE
65 #define MAX_SUPPORT_POINT 2
66 #define REPORTID_MOUSE 0x01
67 #define REPORTID_VENDOR 0x03
68 #define REPORTID_MTOUCH 0x04
71 #define EGALAX_IOC_MAGIC 0x72
72 #define EGALAX_IOCWAKEUP _IO(EGALAX_IOC_MAGIC, 1)
73 #define EGALAX_IOC_MAXNR 1
75 #define EETI_EARLYSUSPEND_LEVEL (EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1)
84 struct workqueue_struct *ktouch_wq;
85 struct work_struct work;
86 struct mutex mutex_wq;
87 struct i2c_client *client;
93 #ifdef CONFIG_HAS_EARLYSUSPEND
95 struct early_suspend early_suspend;
96 struct _egalax_i2c *egalax_i2c;
100 struct egalax_char_dev
104 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
105 struct kfifo* pDataKFiFo;
107 struct kfifo DataKFiFo;
109 unsigned char *pFiFoBuf;
111 struct semaphore sem;
112 wait_queue_head_t fifo_inq;
115 static struct _egalax_i2c *p_egalax_i2c_dev = NULL; // allocated in egalax_i2c_probe
116 static struct egalax_char_dev *p_char_dev = NULL; // allocated in init_module
117 static atomic_t egalax_char_available = ATOMIC_INIT(1);
118 static struct class *egalax_class;
119 #ifndef _NON_INPUT_DEV
120 static struct input_dev *input_dev = NULL;
121 static struct point_data PointBuf[MAX_SUPPORT_POINT];
122 #endif //#ifndef _NON_INPUT_DEV
124 static int egalax_cdev_open(struct inode *inode, struct file *filp)
126 struct egalax_char_dev *cdev;
130 cdev = container_of(inode->i_cdev, struct egalax_char_dev, cdev);
133 TS_DEBUG(" No such char device node \n");
137 if( !atomic_dec_and_test(&egalax_char_available) )
139 atomic_inc(&egalax_char_available);
140 return -EBUSY; /* already open */
144 filp->private_data = cdev;// Used by the read and write metheds
146 TS_DEBUG(" egalax_cdev_open done \n");
147 try_module_get(THIS_MODULE);
151 static int egalax_cdev_release(struct inode *inode, struct file *filp)
153 struct egalax_char_dev *cdev; // device information
157 cdev = container_of(inode->i_cdev, struct egalax_char_dev, cdev);
160 TS_DEBUG(" No such char device node \n");
164 atomic_inc(&egalax_char_available); /* release the device */
166 filp->private_data = NULL;
168 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
169 kfifo_reset( cdev->pDataKFiFo );
171 kfifo_reset( &cdev->DataKFiFo );
174 TS_DEBUG(" egalax_cdev_release done \n");
175 module_put(THIS_MODULE);
179 #define MAX_READ_BUF_LEN 50
180 static char fifo_read_buf[MAX_READ_BUF_LEN];
181 static ssize_t egalax_cdev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
183 int read_cnt, ret, fifoLen;
184 struct egalax_char_dev *cdev = file->private_data;
188 if( down_interruptible(&cdev->sem) )
191 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
192 fifoLen = kfifo_len(cdev->pDataKFiFo);
194 fifoLen = kfifo_len(&cdev->DataKFiFo);
197 while( fifoLen<1 ) /* nothing to read */
199 up(&cdev->sem); /* release the lock */
200 if( file->f_flags & O_NONBLOCK )
203 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
204 if( wait_event_interruptible(cdev->fifo_inq, kfifo_len( cdev->pDataKFiFo )>0) )
206 if( wait_event_interruptible(cdev->fifo_inq, kfifo_len( &cdev->DataKFiFo )>0) )
209 return -ERESTARTSYS; /* signal: tell the fs layer to handle it */
212 if( down_interruptible(&cdev->sem) )
216 if(count > MAX_READ_BUF_LEN)
217 count = MAX_READ_BUF_LEN;
219 TS_DEBUG("\"%s\" reading: real fifo data\n", current->comm);
220 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
221 read_cnt = kfifo_get(cdev->pDataKFiFo, fifo_read_buf, count);
223 read_cnt = kfifo_out_locked(&cdev->DataKFiFo, fifo_read_buf, count, &cdev->FiFoLock);
226 ret = copy_to_user(buf, fifo_read_buf, read_cnt)?-EFAULT:read_cnt;
233 static ssize_t egalax_cdev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
236 struct egalax_char_dev *cdev = file->private_data;
241 if( down_interruptible(&cdev->sem) )
244 if (count > MAX_I2C_LEN)
247 tmp = kmalloc(count,GFP_KERNEL);
254 if(copy_from_user(tmp, buf, count))
261 ret = i2c_master_normal_send(p_egalax_i2c_dev->client, tmp, count,EETI_I2C_RATE);
262 TS_DEBUG("I2C writing %zu bytes.\n", count);
271 static int wakeup_controller(int gpio)
277 if( (ret=gpio_request(gpio, "Touch Wakeup GPIO"))!=0 )
279 printk(KERN_ERR "[egalax_i2c]: Failed to request GPIO for Touch Wakeup GPIO. Err:%d\n", ret);
284 gpio_direction_output(gpio, 0);
285 for(i=0; i<100; i++);
286 gpio_direction_input(gpio);
287 printk(KERN_ERR "[egalax_i2c]: INT wakeup touch controller done\n");
293 static long egalax_cdev_ioctl(struct file *filp, unsigned int cmd, unsigned long args)
295 //struct egalax_char_dev *cdev = file->private_data;
298 if(_IOC_TYPE(cmd) != EGALAX_IOC_MAGIC)
300 if(_IOC_NR(cmd) > EGALAX_IOC_MAXNR)
303 if(_IOC_DIR(cmd) & _IOC_READ)
304 ret = !access_ok(VERIFY_WRITE, (void __user*)args, _IOC_SIZE(cmd));
305 else if(_IOC_DIR(cmd) & _IOC_WRITE)
306 ret = !access_ok(VERIFY_READ, (void __user*)args, _IOC_SIZE(cmd));
311 //printk(KERN_ERR "Handle device ioctl command\n");
314 case EGALAX_IOCWAKEUP:
315 ret = wakeup_controller(irq_to_gpio(p_egalax_i2c_dev->irq));
325 static unsigned int egalax_cdev_poll(struct file *filp, struct poll_table_struct *wait)
327 struct egalax_char_dev *cdev = filp->private_data;
328 unsigned int mask = 0;
332 poll_wait(filp, &cdev->fifo_inq, wait);
334 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
335 fifoLen = kfifo_len(cdev->pDataKFiFo);
337 fifoLen = kfifo_len(&cdev->DataKFiFo);
341 mask |= POLLIN | POLLRDNORM; /* readable */
342 if( (FIFO_SIZE - fifoLen) > MAX_I2C_LEN )
343 mask |= POLLOUT | POLLWRNORM; /* writable */
349 #ifndef _NON_INPUT_DEV
350 static int LastUpdateID = 0;
351 static void ProcessReport(unsigned char *buf, int buflen)
354 short X=0, Y=0, ContactID=0, Status=0;
355 if(buflen!=MAX_I2C_LEN || buf[0]!=0x04) // check buffer len & header
358 Status = buf[1]&0x01;
359 ContactID = (buf[1]&0x7C)>>2;
360 X = ((buf[3]<<8) + buf[2])>>4;
361 Y = ((buf[5]<<8) + buf[4])>>4;
363 PointBuf[ContactID].Status = Status;
364 PointBuf[ContactID].X = X;
365 PointBuf[ContactID].Y = Y;
367 TS_DEBUG("Get Point[%d] Update: Status=%d X=%d Y=%d\n", ContactID, Status, X, Y);
370 if( !Status || (ContactID <= LastUpdateID) )
372 for(i=0; i<MAX_SUPPORT_POINT;i++)
374 if(PointBuf[i].Status > 0)
376 input_mt_slot(input_dev, i);
377 input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, true);
378 input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, PointBuf[i].Status);
379 input_report_abs(input_dev, ABS_MT_POSITION_X, PointBuf[i].X);
380 input_report_abs(input_dev, ABS_MT_POSITION_Y, PointBuf[i].Y);
381 PointBuf[i].Status = 0;
383 else if (PointBuf[i].Status == 0)
385 input_mt_slot(input_dev, i);
386 input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, false);
387 PointBuf[i].Status = -1;
390 input_sync(input_dev);
391 TS_DEBUG("Input sync point data done!\n");
394 LastUpdateID = ContactID;
397 static struct input_dev * allocate_Input_Dev(void)
400 struct input_dev *pInputDev=NULL;
402 pInputDev = input_allocate_device();
403 if(pInputDev == NULL)
405 TS_DEBUG("Failed to allocate input device\n");
406 return NULL;//-ENOMEM;
409 pInputDev->name = "eGalax Touch Screen";
410 pInputDev->phys = "I2C";
411 pInputDev->id.bustype = BUS_I2C;
412 pInputDev->id.vendor = 0x0EEF;
413 pInputDev->id.product = 0x0020;
415 __set_bit(INPUT_PROP_DIRECT, pInputDev->propbit);
416 __set_bit(EV_ABS, pInputDev->evbit);
418 input_mt_init_slots(pInputDev, MAX_SUPPORT_POINT);
419 input_set_abs_params(pInputDev, ABS_MT_POSITION_X, 0, CONFIG_EETI_EGALAX_MAX_X, 0, 0);
420 input_set_abs_params(pInputDev, ABS_MT_POSITION_Y, 0, CONFIG_EETI_EGALAX_MAX_Y, 0, 0);
421 input_set_abs_params(pInputDev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
423 ret = input_register_device(pInputDev);
426 TS_DEBUG("Unable to register input device.\n");
427 input_free_device(pInputDev);
433 #endif //#ifndef _NON_INPUT_DEV
435 static int egalax_i2c_measure(struct i2c_client *client, char skip_packet)
437 u8 x_buf[MAX_I2C_LEN];
441 count = i2c_master_normal_recv(client, x_buf, MAX_I2C_LEN,EETI_I2C_RATE);
442 }while(count==EAGAIN && --loop);
444 if( count<0 || (x_buf[0]!=REPORTID_VENDOR && x_buf[0]!=REPORTID_MTOUCH) )
446 TS_DEBUG("I2C read error data with Len=%d hedaer=%d\n", count, x_buf[0]);
450 TS_DEBUG("egalax_i2c read data with Len=%d\n", count);
451 if(x_buf[0]==REPORTID_VENDOR)
452 TS_DEBUG("egalax_i2c get command packet\n");
454 if( skip_packet > 0 )
457 #ifndef _NON_INPUT_DEV
458 if( count>0 && x_buf[0]==REPORTID_MTOUCH )
460 ProcessReport(x_buf, count);
464 #endif //#ifndef _NON_INPUT_DEV
466 if( count>0 && p_char_dev->OpenCnts>0 ) // If someone reading now! put the data into the buffer!
468 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
469 kfifo_put(p_char_dev->pDataKFiFo, x_buf, count);
471 kfifo_in_locked(&p_char_dev->DataKFiFo, x_buf, count, &p_char_dev->FiFoLock);
473 wake_up_interruptible( &p_char_dev->fifo_inq );
479 static void egalax_i2c_wq(struct work_struct *work)
481 struct _egalax_i2c *egalax_i2c = container_of(work, struct _egalax_i2c, work);
482 struct i2c_client *client = egalax_i2c->client;
483 int gpio = client->irq;
484 TS_DEBUG("egalax_i2c_wq run\n");
485 mutex_lock(&egalax_i2c->mutex_wq);
487 /*continue recv data*/
488 while( !gpio_get_value(gpio) && egalax_i2c->work_state>0 )
490 egalax_i2c_measure(client, egalax_i2c->skip_packet);
491 schedule_timeout_interruptible(HZ/100);
494 #ifndef _NON_INPUT_DEV
495 if (gpio_get_value(gpio) && egalax_i2c->work_state > 0 && !egalax_i2c->skip_packet) {
497 for(i = 0; i < MAX_SUPPORT_POINT; i++) {
498 if (PointBuf[i].Status > 0) {
499 TS_DEBUG("point %d still down\n", i);
500 input_mt_slot(input_dev, i);
501 input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, true);
502 input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, 0);
503 input_report_abs(input_dev, ABS_MT_POSITION_X, PointBuf[i].X);
504 input_report_abs(input_dev, ABS_MT_POSITION_Y, PointBuf[i].Y);
505 PointBuf[i].Status = 0;
507 else if (PointBuf[i].Status == 0)
509 input_mt_slot(input_dev, i);
510 input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, false);
511 PointBuf[i].Status = -1;
514 input_sync(input_dev);
518 if( egalax_i2c->skip_packet > 0 )
519 egalax_i2c->skip_packet = 0;
521 mutex_unlock(&egalax_i2c->mutex_wq);
523 enable_irq(p_egalax_i2c_dev->irq);
525 TS_DEBUG("egalax_i2c_wq leave\n");
528 static irqreturn_t egalax_i2c_interrupt(int irq, void *dev_id)
530 struct _egalax_i2c *egalax_i2c = (struct _egalax_i2c *)dev_id;
531 TS_DEBUG("egalax_i2c_interrupt with irq:%d\n", irq);
532 disable_irq_nosync(irq);
533 queue_work(egalax_i2c->ktouch_wq, &egalax_i2c->work);
539 void egalax_i2c_set_standby(struct i2c_client *client, int enable)
541 struct eeti_egalax_platform_data *mach_info = client->dev.platform_data;
542 unsigned display_on = mach_info->disp_on_pin;
543 unsigned lcd_standby = mach_info->standby_pin;
545 int display_on_pol = mach_info->disp_on_value;
546 int lcd_standby_pol = mach_info->standby_value;
547 #ifndef CONFIG_ARCH_RK2928
548 printk("%s : %s, enable = %d", __FILE__, __FUNCTION__,enable);
549 if(display_on != INVALID_GPIO)
551 gpio_direction_output(display_on, 0);
552 gpio_set_value(display_on, enable ? display_on_pol : !display_on_pol);
554 if(lcd_standby != INVALID_GPIO)
556 gpio_direction_output(lcd_standby, 0);
557 gpio_set_value(lcd_standby, enable ? lcd_standby_pol : !lcd_standby_pol);
563 static int egalax_i2c_suspend(struct i2c_client *client, pm_message_t mesg)
565 struct _egalax_i2c *egalax_i2c = i2c_get_clientdata(client);
566 u8 cmdbuf[MAX_I2C_LEN]={0x03, 0x05, 0x0A, 0x03, 0x36, 0x3F, 0x02, 0, 0, 0};
568 i2c_master_normal_send(client, cmdbuf, MAX_I2C_LEN, EETI_I2C_RATE);
570 disable_irq(p_egalax_i2c_dev->irq);
571 egalax_i2c->work_state = 0;
572 if (cancel_work_sync(&egalax_i2c->work)) {
573 /* if work was pending disable-count is now 2 */
574 pr_info("%s: work was pending\n", __func__);
575 enable_irq(p_egalax_i2c_dev->irq);
578 printk(KERN_DEBUG "[egalax_i2c]: device suspend done\n");
580 if(device_may_wakeup(&client->dev))
582 enable_irq_wake(p_egalax_i2c_dev->irq);
586 printk(KERN_DEBUG "[egalax_i2c]: device_may_wakeup false\n");
588 egalax_i2c_set_standby(client, 0);
592 static int egalax_i2c_resume(struct i2c_client *client)
594 struct _egalax_i2c *egalax_i2c = i2c_get_clientdata(client);
595 egalax_i2c_set_standby(client, 1);
596 if(device_may_wakeup(&client->dev))
598 disable_irq_wake(p_egalax_i2c_dev->irq);
602 printk(KERN_DEBUG "[egalax_i2c]: device_may_wakeup false\n");
605 wakeup_controller(irq_to_gpio(p_egalax_i2c_dev->irq));
606 egalax_i2c->work_state = 1;
607 enable_irq(p_egalax_i2c_dev->irq);
609 printk(KERN_DEBUG "[egalax_i2c]: device wakeup done\n");
614 #ifdef CONFIG_HAS_EARLYSUSPEND
616 static void egalax_i2c_early_suspend(struct early_suspend *h)
618 pm_message_t mesg = {.event = 0};
619 struct suspend_info *info = container_of(h,struct suspend_info,early_suspend);
620 struct i2c_client *client = info->egalax_i2c->client;
621 egalax_i2c_suspend(client,mesg);
624 static void egalax_i2c_early_resume(struct early_suspend *h)
627 struct suspend_info *info = container_of(h,struct suspend_info,early_suspend);
628 struct i2c_client *client = info->egalax_i2c->client;
630 egalax_i2c_resume(client);
639 #define egalax_i2c_suspend NULL
640 #define egalax_i2c_resume NULL
643 #ifdef CONFIG_HAS_EARLYSUSPEND
644 static struct suspend_info suspend_info = {
645 .early_suspend.suspend = egalax_i2c_early_suspend,
646 .early_suspend.resume = egalax_i2c_early_resume,
647 .early_suspend.level = EETI_EARLYSUSPEND_LEVEL,
652 static int __devinit egalax_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
655 int gpio = client->irq;
656 struct eeti_egalax_platform_data *pdata = pdata = client->dev.platform_data;
658 printk(KERN_DEBUG "[egalax_i2c]: start probe\n");
660 p_egalax_i2c_dev = (struct _egalax_i2c *)kzalloc(sizeof(struct _egalax_i2c), GFP_KERNEL);
661 if (!p_egalax_i2c_dev)
663 printk(KERN_ERR "[egalax_i2c]: request memory failed\n");
668 #ifndef _NON_INPUT_DEV
669 input_dev = allocate_Input_Dev();
672 printk(KERN_ERR "[egalax_i2c]: allocate_Input_Dev failed\n");
676 TS_DEBUG("egalax_i2c register input device done\n");
677 memset(PointBuf, 0, sizeof(struct point_data)*MAX_SUPPORT_POINT);
678 #endif //#ifndef _NON_INPUT_DEV
680 if (pdata->init_platform_hw)
681 pdata->init_platform_hw();
683 p_egalax_i2c_dev->client = client;
684 mutex_init(&p_egalax_i2c_dev->mutex_wq);
686 p_egalax_i2c_dev->ktouch_wq = create_workqueue("egalax_touch_wq");
687 INIT_WORK(&p_egalax_i2c_dev->work, egalax_i2c_wq);
689 i2c_set_clientdata(client, p_egalax_i2c_dev);
691 if( gpio_get_value(gpio) )
692 p_egalax_i2c_dev->skip_packet = 0;
694 p_egalax_i2c_dev->skip_packet = 1;
696 p_egalax_i2c_dev->work_state = 1;
698 p_egalax_i2c_dev->irq = gpio_to_irq(client->irq);
700 ret = request_irq(p_egalax_i2c_dev->irq, egalax_i2c_interrupt, IRQF_TRIGGER_LOW,
701 client->name, p_egalax_i2c_dev);
704 printk(KERN_ERR "[egalax_i2c]: request irq(%d) failed\n", p_egalax_i2c_dev->irq);
707 TS_DEBUG("egalax_i2c request irq(%d) gpio(%d) with result:%d\n", p_egalax_i2c_dev->irq, gpio, ret);
710 device_init_wakeup(&client->dev, 0);
713 #ifdef CONFIG_HAS_EARLYSUSPEND
716 suspend_info.egalax_i2c = p_egalax_i2c_dev;
717 register_early_suspend(&suspend_info.early_suspend);
720 printk(KERN_DEBUG "[egalax_i2c]: probe done\n");
724 i2c_set_clientdata(client, NULL);
725 destroy_workqueue(p_egalax_i2c_dev->ktouch_wq);
726 free_irq(p_egalax_i2c_dev->irq, p_egalax_i2c_dev);
727 #ifndef _NON_INPUT_DEV
728 input_unregister_device(input_dev);
729 input_free_device(input_dev);
731 #endif //#ifndef _NON_INPUT_DEV
734 kfree(p_egalax_i2c_dev);
735 p_egalax_i2c_dev = NULL;
737 printk(KERN_DEBUG "[egalax_i2c]: probe failed\n");
741 static int __devexit egalax_i2c_remove(struct i2c_client *client)
743 struct _egalax_i2c *egalax_i2c = i2c_get_clientdata(client);
747 #ifndef _NON_INPUT_DEV
750 TS_DEBUG("unregister input device\n");
751 input_unregister_device(input_dev);
752 input_free_device(input_dev);
755 #endif //#ifndef _NON_INPUT_DEV
757 if(p_egalax_i2c_dev->ktouch_wq)
759 destroy_workqueue(p_egalax_i2c_dev->ktouch_wq);
762 if(p_egalax_i2c_dev->irq)
764 free_irq(p_egalax_i2c_dev->irq, egalax_i2c);
767 i2c_set_clientdata(client, NULL);
769 p_egalax_i2c_dev = NULL;
774 static struct i2c_device_id egalax_i2c_idtable[] = {
779 MODULE_DEVICE_TABLE(i2c, egalax_i2c_idtable);
781 static struct i2c_driver egalax_i2c_driver = {
783 .name = "egalax_i2c",
785 .id_table = egalax_i2c_idtable,
786 .probe = egalax_i2c_probe,
787 .remove = __devexit_p(egalax_i2c_remove),
788 //.suspend = egalax_i2c_suspend,
789 //.resume = egalax_i2c_resume,
792 static const struct file_operations egalax_cdev_fops = {
793 .owner = THIS_MODULE,
794 .read = egalax_cdev_read,
795 .write = egalax_cdev_write,
796 .unlocked_ioctl = egalax_cdev_ioctl,
797 .poll = egalax_cdev_poll,
798 .open = egalax_cdev_open,
799 .release= egalax_cdev_release,
802 static void egalax_i2c_ts_exit(void)
804 dev_t devno = MKDEV(global_major, global_minor);
809 TS_DEBUG("unregister character device\n");
810 if( p_char_dev->pFiFoBuf )
811 kfree(p_char_dev->pFiFoBuf);
813 cdev_del(&p_char_dev->cdev);
818 unregister_chrdev_region( devno, 1);
820 if(!IS_ERR(egalax_class))
822 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26)
823 class_device_destroy(egalax_class, devno);
825 device_destroy(egalax_class, devno);
827 class_destroy(egalax_class);
830 i2c_del_driver(&egalax_i2c_driver);
832 printk(KERN_DEBUG "[egalax_i2c]: driver exit\n");
835 static struct egalax_char_dev* setup_chardev(dev_t dev)
837 struct egalax_char_dev *pCharDev;
840 pCharDev = kmalloc(1*sizeof(struct egalax_char_dev), GFP_KERNEL);
843 memset(pCharDev, 0, sizeof(struct egalax_char_dev));
845 spin_lock_init( &pCharDev->FiFoLock );
846 pCharDev->pFiFoBuf = kmalloc(sizeof(unsigned char)*FIFO_SIZE, GFP_KERNEL);
847 if(!pCharDev->pFiFoBuf)
849 memset(pCharDev->pFiFoBuf, 0, sizeof(unsigned char)*FIFO_SIZE);
851 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
852 pCharDev->pDataKFiFo = kfifo_init(pCharDev->pFiFoBuf, FIFO_SIZE, GFP_KERNEL, &pCharDev->FiFoLock);
853 if( pCharDev->pDataKFiFo==NULL )
856 kfifo_init(&pCharDev->DataKFiFo, pCharDev->pFiFoBuf, FIFO_SIZE);
857 if( !kfifo_initialized(&pCharDev->DataKFiFo) )
861 pCharDev->OpenCnts = 0;
862 cdev_init(&pCharDev->cdev, &egalax_cdev_fops);
863 pCharDev->cdev.owner = THIS_MODULE;
864 sema_init(&pCharDev->sem, 1);
865 init_waitqueue_head(&pCharDev->fifo_inq);
867 result = cdev_add(&pCharDev->cdev, dev, 1);
870 TS_DEBUG(KERN_ERR "Error cdev ioctldev added\n");
877 kfree(pCharDev->pFiFoBuf);
884 static void __init egalax_i2c_ts_init_async(void *unused, async_cookie_t cookie)
891 // Asking for a dynamic major unless directed otherwise at load time.
894 devno = MKDEV(global_major, global_minor);
895 result = register_chrdev_region(devno, 1, "egalax_i2c");
899 result = alloc_chrdev_region(&devno, global_minor, 1, "egalax_i2c");
900 global_major = MAJOR(devno);
905 TS_DEBUG(" egalax_i2c cdev can't get major number\n");
909 // allocate the character device
910 p_char_dev = setup_chardev(devno);
917 egalax_class = class_create(THIS_MODULE, "egalax_i2c");
918 if(IS_ERR(egalax_class))
920 TS_DEBUG("Err: failed in creating class.\n");
925 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26)
926 class_device_create(egalax_class, NULL, devno, NULL, "egalax_i2c");
928 device_create(egalax_class, NULL, devno, NULL, "egalax_i2c");
930 TS_DEBUG("register egalax_i2c cdev, major: %d \n",global_major);
932 printk(KERN_DEBUG "[egalax_i2c]: init done\n");
933 i2c_add_driver(&egalax_i2c_driver);
937 egalax_i2c_ts_exit();
940 static int __init egalax_i2c_ts_init(void)
942 async_schedule(egalax_i2c_ts_init_async, NULL);
945 module_init(egalax_i2c_ts_init);
946 module_exit(egalax_i2c_ts_exit);
948 MODULE_DESCRIPTION("egalax touch screen i2c driver");
949 MODULE_LICENSE("GPL");