/* * GSC3280 SoC ADC(SPI0) Controller Driver * * Copyright (C) 2013 BLX IC Design Corp.,Ltd. * Author: Davied, apple_guet@126.com * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_GSC3280_TS_DEBUG #define DBG(msg...) do { \ printk(KERN_INFO msg); \ } while (0) #else #define DBG(msg...) do { } while(0) #endif //CRC static const unsigned char crc8_tab[] = { 0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15, 0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D, 0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65, 0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D, 0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5, 0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD, 0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85, 0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD, 0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2, 0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA, 0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2, 0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A, 0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32, 0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A, 0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42, 0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A, 0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C, 0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4, 0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC, 0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4, 0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C, 0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44, 0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C, 0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34, 0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B, 0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63, 0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B, 0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13, 0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB, 0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83, 0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB, 0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3, }; #define GSC3280_TS_NAME_SIZE 20 #define TS_1WIRE_NAME "ts-1wire" #define BACKLIGHT_DEVICE_NAME "backlight-1wire" #define SAMPLE_BPS 9600 #define SLOW_LOOP_FEQ 25 #define FAST_LOOP_FEQ 60 #define REQ_TS 0x40U #define REQ_INFO 0x60U #define BL_INIT 0x7fU #define crc8_init(crc) ((crc) = 0XACU) #define crc8(crc, v) ((crc) = crc8_tab[(crc) ^(v)]) /* Touch screen coordinates */ #define GSC_X_MIN 0 #define GSC_X_MAX 4096 #define GSC_X_FUZZ 5 #define GSC_Y_MIN 0 #define GSC_Y_MAX 4096 #define GSC_Y_FUZZ 5 #define GSC_PRESSURE_MIN 0 #define GSC_PRESSURE_MAX 2000 #define TIMER_DELAY HZ / 40 //25ms #define TS_1WIRE_DATA_PIN 22 typedef enum { IDLE, START, REQUEST, WAITING, RESPONSE, STOPING, } one_wire_status_e; /* Touch screen device structure */ struct ts_1wire_t { u8 req; u8 flg; char phys[32]; char name[20]; volatile unsigned int io_data; volatile unsigned int io_bit_count; unsigned lcd_type; volatile unsigned short x; volatile unsigned short y; volatile unsigned short old_x; volatile unsigned short old_y; volatile unsigned z; volatile u8 ts_ready; volatile u8 bl_ready; u8 backlight_req; u8 backlight_init_success; volatile unsigned data; one_wire_status_e one_wire_status; spinlock_t slock; struct device *dev; struct input_dev *input; struct list_head device_entry; struct gsc3280_hard_timer ts_hard_timer; }; #ifndef CONFIG_INPUT_TSDEV_SCREEN_X #define CONFIG_INPUT_TSDEV_SCREEN_X 800 #endif #ifndef CONFIG_INPUT_TSDEV_SCREEN_Y #define CONFIG_INPUT_TSDEV_SCREEN_Y 480 #endif static const int gXres = CONFIG_INPUT_TSDEV_SCREEN_X; static const int gYres = CONFIG_INPUT_TSDEV_SCREEN_Y; static LIST_HEAD(wire1_ts_list); static DEFINE_MUTEX(wire1_ts_list_lock); static struct timer_list ts_1wire_timer; /* backlight driver user interface begin */ static DECLARE_WAIT_QUEUE_HEAD(bl_waitq); /* lcd backlight control function */ int wire1_backlight_control(u8 bl_data) { int ret = -ENXIO; struct ts_1wire_t *ts = NULL; mutex_lock(&wire1_ts_list_lock); list_for_each_entry(ts, &wire1_ts_list, device_entry) { if(strcmp(ts->name, TS_1WIRE_NAME) == 0) { ret = 0; break; } } mutex_unlock(&wire1_ts_list_lock); if (ret != 0) { return ret; } if (bl_data > 127) { bl_data = 127; } ts->bl_ready = 0; ts->backlight_req = bl_data + 0x80U; ret = wait_event_interruptible_timeout(bl_waitq, ts->bl_ready, HZ); if (ret < 0) { printk(KERN_INFO "wait_event_interruptible_timeout error!\n"); return ret; } else if (ret == 0) { printk(KERN_INFO "time out error!\n"); return -ETIMEDOUT; } else { return 0; } } EXPORT_SYMBOL(wire1_backlight_control); static inline void notify_bl_data(struct ts_1wire_t *ts, u8 a, u8 b, u8 c) { ts->bl_ready = 1; wake_up_interruptible(&bl_waitq); } static int bl_open(struct inode *inode, struct file *filp) { int status = -ENXIO; struct ts_1wire_t *ts = NULL; mutex_lock(&wire1_ts_list_lock); list_for_each_entry(ts, &wire1_ts_list, device_entry) { if(strcmp(ts->name, TS_1WIRE_NAME) == 0) { status = 0; break; } } mutex_unlock(&wire1_ts_list_lock); if (status == 0) { filp->private_data = ts; } else { return status; } return nonseekable_open(inode, filp); } static ssize_t bl_write(struct file *filp, const char __user *buffer, size_t count, loff_t *ppos) { int ret = 0; u8 bl_data = 0; struct ts_1wire_t *ts = filp->private_data; DBG("bl_write start\n"); if (get_user(bl_data, (u8 __user *)buffer)) { printk(KERN_INFO "get_user error!\n"); return -EFAULT; } if (bl_data > 127) { bl_data = 127; } ts->bl_ready = 0; ts->backlight_req = bl_data + 0x80U; ret = wait_event_interruptible_timeout(bl_waitq, ts->bl_ready, HZ); if (ret < 0) { printk(KERN_INFO "wait_event_interruptible_timeout error!\n"); return ret; } else if (ret == 0) { printk(KERN_INFO "time out error!\n"); return -ETIMEDOUT; } else { return count; } } static struct file_operations bl_fops = { owner : THIS_MODULE, write : bl_write, open : bl_open, }; static struct miscdevice bl_misc = { .minor = MISC_DYNAMIC_MINOR, .name = BACKLIGHT_DEVICE_NAME, .fops = &bl_fops, }; /* backlight driver user interface end */ static void gsc3280_report_event(struct ts_1wire_t *ts, u32 z) { #ifdef CONFIG_GSC3280_POS_PRINT printk(KERN_INFO "x = %d\n", ts->x); printk(KERN_INFO "y = %d\n", ts->y); printk(KERN_INFO "z = %d\n", z); #endif input_report_abs(ts->input, ABS_PRESSURE, z); input_report_abs(ts->input, ABS_X, ts->x); input_report_abs(ts->input, ABS_Y, ts->y); if (z > 0) input_report_key(ts->input, BTN_TOUCH, 1); else input_report_key(ts->input, BTN_TOUCH, 0); input_sync(ts->input); } static inline void notify_ts_data(struct ts_1wire_t *ts) { if (ts->z == 1) { ts->x = ((ts->x -285) * gXres) / (3944 - 285); ts->y = ((3936 - ts->y) * gYres) / (3936 - 102); if ((ts->x > 0) && (ts->x < gXres) && (ts->y > 0) && (ts->y < gYres)) { if (ts->flg == 0) { ts->flg = 1; gsc3280_report_event(ts, 0); } gsc3280_report_event(ts, ts->z); ts->old_x = ts->x; ts->old_y = ts->y; } } else if (ts->z == 0) { if (ts->flg == 1) { ts->flg = 0; ts->x = ts->old_x; ts->y = ts->old_y; gsc3280_report_event(ts, 0); } } } static inline void notify_info_data(struct ts_1wire_t *ts, unsigned char lcd_type, unsigned char ver_year, unsigned char week) { if (lcd_type != 0xFF) { ts->lcd_type = lcd_type; //firmware_ver = ver_year * 100 + week; } } static void one_wire_session_complete(struct ts_1wire_t *ts) { u8 crc = 0; const unsigned char *p = (const u8*)&(ts->io_data); crc8_init(crc); crc8(crc, p[3]); crc8(crc, p[2]); crc8(crc, p[1]); if (crc != p[0]) { DBG("one_wire_session_complete crc error\n"); return; } switch(ts->req) { case REQ_TS: ts->x = ((p[3] >> 4U) << 8U) + p[2]; ts->y = ((p[3] & 0xFU) << 8U) + p[1]; ts->z = (ts->x != 0xFFFU) && (ts->y != 0xFFFU); notify_ts_data(ts); break; case REQ_INFO: notify_info_data(ts, p[3], p[2], p[1]); break; default: notify_bl_data(ts, p[3], p[2], p[1]); break; } } //Pin access static inline void set_pin_up(void) { } static inline void set_pin_as_input(void) { gpio_direction_input(TS_1WIRE_DATA_PIN); } static inline void set_pin_as_output(void) { gpio_direction_output(TS_1WIRE_DATA_PIN, 1); } static inline void set_pin_value(int v) { if (v) { gpio_set_value(TS_1WIRE_DATA_PIN, 1); } else { gpio_set_value(TS_1WIRE_DATA_PIN, 0); } } static inline int get_pin_value(void) { return gpio_get_value(TS_1WIRE_DATA_PIN); } static void ts_1wire_hardtimer_callback(unsigned long data) { struct ts_1wire_t *ts = (struct ts_1wire_t *)data; //DBG("ts_1wire_hardtimer_callback start\n"); ts->io_bit_count--; switch(ts->one_wire_status) { case START: //DBG("START\n"); if (ts->io_bit_count == 0) { ts->io_bit_count = 16; ts->one_wire_status = REQUEST; } break; case REQUEST: //Send a bit //DBG("REQUEST\n"); set_pin_value(ts->io_data & (1U << 31)); ts->io_data <<= 1; if (ts->io_bit_count == 0) { ts->io_bit_count = 2; ts->one_wire_status = WAITING; } break; case WAITING: //DBG("WAITING\n"); if (ts->io_bit_count == 0) { ts->io_bit_count = 32; ts->one_wire_status = RESPONSE; } else if (ts->io_bit_count == 1) { set_pin_as_input(); set_pin_value(1); } break; case RESPONSE: //Get a bit //DBG("RESPONSE\n"); ts->io_data = (ts->io_data << 1) | get_pin_value(); if (ts->io_bit_count == 0) { ts->io_bit_count = 2; ts->one_wire_status = STOPING; set_pin_value(1); set_pin_as_output(); one_wire_session_complete(ts); } break; case STOPING: //DBG("STOPING\n"); if (ts->io_bit_count == 0) { ts->one_wire_status = IDLE; gsc3280_timer_stop(&ts->ts_hard_timer); mod_timer(&ts_1wire_timer, jiffies + TIMER_DELAY); } break; default: //DBG("default\n"); gsc3280_timer_stop(&ts->ts_hard_timer); mod_timer(&ts_1wire_timer, jiffies + TIMER_DELAY); break; } } static void init_hard_timer_for_1wire(struct ts_1wire_t *ts) { ts->ts_hard_timer.type = LOOP; ts->ts_hard_timer.value_type = 1; ts->ts_hard_timer.bps = SAMPLE_BPS; ts->ts_hard_timer.function = ts_1wire_hardtimer_callback; ts->ts_hard_timer.data = (unsigned long)ts; } static void start_one_wire_session(struct ts_1wire_t *ts) { u8 crc = 0; unsigned long flags = 0; if (ts->one_wire_status != IDLE) { DBG("one_wire_status: %d error!!!!\n", ts->one_wire_status); return; } spin_lock_irqsave(&ts->slock, flags); ts->one_wire_status = START; //IDLE to START set_pin_value(1); set_pin_as_output(); crc8_init(crc); crc8(crc, ts->req); ts->io_data = (ts->req << 8) + crc; ts->io_data <<= 16; ts->io_bit_count = 1; set_pin_as_output(); spin_unlock_irqrestore(&ts->slock, flags); local_irq_save(flags); gsc3280_timer_start(&ts->ts_hard_timer); set_pin_value(0); local_irq_restore(flags); } static void one_wire_timer_callback(unsigned long data) { unsigned long flags = 0; struct ts_1wire_t *ts = (struct ts_1wire_t *)data; //mod_timer(&ts_1wire_timer, jiffies + TIMER_DELAY); spin_lock_irqsave(&ts->slock, flags); if (ts->lcd_type == 0) { //DBG("REQ_INFO\n"); ts->req = REQ_INFO; } else if (!ts->backlight_init_success) { //DBG("backlight_init_success\n"); ts->backlight_init_success = 1; ts->req = BL_INIT; } else if (ts->backlight_req) { //DBG("backlight_req\n"); ts->req = ts->backlight_req; ts->backlight_req = 0; } else { //DBG("REQ_TS\n"); ts->req = REQ_TS; } spin_unlock_irqrestore(&ts->slock, flags); start_one_wire_session(ts); } static int ts_1wire_probe(struct platform_device *pdev) { int ret = 0; struct ts_1wire_t *ts = NULL; struct input_dev *input = NULL; DBG("############\n"); printk(KERN_INFO "ts 1wire probe start.\n"); ts = kzalloc(sizeof(struct ts_1wire_t), GFP_KERNEL); if (!ts) { DBG("kzalloc error\n"); return -ENOMEM; } input = input_allocate_device(); if (!input) { ret = -ENOMEM; goto err_free_mem; } spin_lock_init(&ts->slock); ts->dev = &pdev->dev; snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(ts->dev)); input->name = "h3600_ts"; input->phys = ts->phys; input->dev.parent = ts->dev; input->id.vendor = 0x00; //tsdev->vendor; input->id.version = 0x00; //tsdev->rev; input->id.product = 0x03; //tsdev->rev; input->id.bustype = BUS_HOST; //should be spi input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); __set_bit(EV_REP, input->evbit); __set_bit(EV_KEY, input->evbit); __set_bit(BTN_TOUCH, input->keybit); __set_bit(EV_ABS, input->evbit); __set_bit(ABS_X, input->absbit); __set_bit(ABS_Y, input->absbit); __set_bit(ABS_PRESSURE, input->absbit); ts->input = input; input_set_abs_params(ts->input, ABS_X, GSC_X_MIN, GSC_X_MAX, GSC_X_FUZZ, 0); input_set_abs_params(ts->input, ABS_Y, GSC_Y_MIN, GSC_Y_MAX, GSC_Y_FUZZ, 0); input_set_abs_params(ts->input, ABS_PRESSURE, GSC_PRESSURE_MIN, GSC_PRESSURE_MAX, 0, 0); ret = input_register_device(ts->input); if (ret) { DBG("!!!!input register device error!\n"); goto err_free_input; } strlcpy(ts->name, TS_1WIRE_NAME, sizeof(ts->name)); ret = gpio_request(TS_1WIRE_DATA_PIN, "TS_1WIRE_DATA_PIN"); if (ret) { DBG("gpio request error!\n"); goto err_free_input; } set_pin_up(); set_pin_value(1); set_pin_as_output(); init_hard_timer_for_1wire(ts); ret = gsc3280_request_hard_timer(&ts->ts_hard_timer); if (ret) { DBG("gsc3280 request hard timer error\n"); goto err_gpio_req; } ret = misc_register(&bl_misc); if (ret != 0) { DBG("misc_register bl_misc error!\n"); goto err_hard_timer_req; } ts->one_wire_status = IDLE; init_timer(&ts_1wire_timer); ts_1wire_timer.data = (unsigned long)ts; ts_1wire_timer.expires = jiffies + TIMER_DELAY; ts_1wire_timer.function = one_wire_timer_callback; add_timer(&ts_1wire_timer); mutex_lock(&wire1_ts_list_lock); list_add(&ts->device_entry, &wire1_ts_list); mutex_unlock(&wire1_ts_list_lock); platform_set_drvdata(pdev, ts); printk(KERN_INFO "ts 1wire probe success.\n"); DBG("############\n"); return 0; err_hard_timer_req: gsc3280_free_hard_timer(&ts->ts_hard_timer); err_gpio_req: gpio_free(TS_1WIRE_DATA_PIN); err_free_input: input_free_device(input); err_free_mem: kfree(ts); printk(KERN_INFO "!!!!ts 1wire probe error!!!!!\n"); return ret; } static int ts_1wire_remove(struct platform_device *pdev) { struct ts_1wire_t *ts = platform_get_drvdata(pdev);; platform_set_drvdata(pdev, NULL); del_timer_sync(&ts_1wire_timer); gpio_free(TS_1WIRE_DATA_PIN); misc_deregister(&bl_misc); kfree(ts); printk(KERN_INFO "ts 1wire remove.\n"); return 0; } static struct platform_driver ts_1wire_device_driver = { .probe = ts_1wire_probe, .remove = __devexit_p(ts_1wire_remove), .driver = { .name = "ts_1wire_device", .owner = THIS_MODULE, } }; static int __init ts_1wire_init(void) { return platform_driver_register(&ts_1wire_device_driver); } static void __exit ts_1wire_exit(void) { platform_driver_unregister(&ts_1wire_device_driver); } module_init(ts_1wire_init); module_exit(ts_1wire_exit); MODULE_AUTHOR("Davied"); MODULE_DESCRIPTION("GSC3280 one wire ts Driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("gsc3280 one wire ts");