652 lines
16 KiB
C
652 lines
16 KiB
C
/*
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* GSC3280 SoC ADC(SPI0) Controller Driver
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*
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* Copyright (C) 2013 BLX IC Design Corp.,Ltd.
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* Author: Davied, apple_guet@126.com
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*
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*/
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/uaccess.h>
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/delay.h>
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#include <linux/input.h>
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#include <linux/irqreturn.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pm.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/serio.h>
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#include <linux/clk.h>
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#include <linux/timer.h>
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#include <linux/param.h>
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#include <linux/poll.h>
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#include <linux/proc_fs.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/miscdevice.h>
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#include <linux/types.h>
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#include <linux/gpio.h>
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#include <linux/platform_device.h>
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#include <gsc3280/gpio.h>
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#include <gsc3280/timer.h>
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#include <gsc3280/sysctl.h>
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#include <gsc3280/gsc3280_int.h>
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#ifdef CONFIG_GSC3280_TS_DEBUG
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#define DBG(msg...) do { \
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printk(KERN_INFO msg); \
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} while (0)
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#else
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#define DBG(msg...) do { } while(0)
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#endif
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//CRC
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static const unsigned char crc8_tab[] = {
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0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15,
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0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
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0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65,
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0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
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0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5,
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0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
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0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85,
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0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
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0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2,
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0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
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0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2,
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0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
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0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32,
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0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
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0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,
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0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
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0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C,
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0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
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0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC,
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0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
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0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C,
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0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
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0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C,
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0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
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0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B,
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0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
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0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B,
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0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
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0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB,
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0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
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0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB,
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0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3,
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};
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#define GSC3280_TS_NAME_SIZE 20
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#define TS_1WIRE_NAME "ts-1wire"
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#define BACKLIGHT_DEVICE_NAME "backlight-1wire"
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#define SAMPLE_BPS 9600
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#define SLOW_LOOP_FEQ 25
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#define FAST_LOOP_FEQ 60
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#define REQ_TS 0x40U
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#define REQ_INFO 0x60U
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#define BL_INIT 0x7fU
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#define crc8_init(crc) ((crc) = 0XACU)
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#define crc8(crc, v) ((crc) = crc8_tab[(crc) ^(v)])
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/* Touch screen coordinates */
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#define GSC_X_MIN 0
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#define GSC_X_MAX 4096
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#define GSC_X_FUZZ 5
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#define GSC_Y_MIN 0
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#define GSC_Y_MAX 4096
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#define GSC_Y_FUZZ 5
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#define GSC_PRESSURE_MIN 0
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#define GSC_PRESSURE_MAX 2000
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#define TIMER_DELAY HZ / 40 //25ms
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#define TS_1WIRE_DATA_PIN 22
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typedef enum {
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IDLE,
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START,
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REQUEST,
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WAITING,
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RESPONSE,
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STOPING,
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} one_wire_status_e;
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/* Touch screen device structure */
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struct ts_1wire_t {
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u8 req;
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u8 flg;
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char phys[32];
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char name[20];
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volatile unsigned int io_data;
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volatile unsigned int io_bit_count;
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unsigned lcd_type;
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volatile unsigned short x;
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volatile unsigned short y;
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volatile unsigned short old_x;
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volatile unsigned short old_y;
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volatile unsigned z;
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volatile u8 ts_ready;
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volatile u8 bl_ready;
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u8 backlight_req;
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u8 backlight_init_success;
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volatile unsigned data;
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one_wire_status_e one_wire_status;
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spinlock_t slock;
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struct device *dev;
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struct input_dev *input;
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struct list_head device_entry;
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struct gsc3280_hard_timer ts_hard_timer;
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};
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#ifndef CONFIG_INPUT_TSDEV_SCREEN_X
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#define CONFIG_INPUT_TSDEV_SCREEN_X 800
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#endif
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#ifndef CONFIG_INPUT_TSDEV_SCREEN_Y
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#define CONFIG_INPUT_TSDEV_SCREEN_Y 480
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#endif
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static const int gXres = CONFIG_INPUT_TSDEV_SCREEN_X;
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static const int gYres = CONFIG_INPUT_TSDEV_SCREEN_Y;
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static LIST_HEAD(wire1_ts_list);
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static DEFINE_MUTEX(wire1_ts_list_lock);
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static struct timer_list ts_1wire_timer;
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/* backlight driver user interface begin */
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static DECLARE_WAIT_QUEUE_HEAD(bl_waitq);
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/* lcd backlight control function */
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int wire1_backlight_control(u8 bl_data)
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{
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int ret = -ENXIO;
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struct ts_1wire_t *ts = NULL;
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mutex_lock(&wire1_ts_list_lock);
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list_for_each_entry(ts, &wire1_ts_list, device_entry) {
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if(strcmp(ts->name, TS_1WIRE_NAME) == 0) {
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ret = 0;
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break;
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}
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}
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mutex_unlock(&wire1_ts_list_lock);
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if (ret != 0) {
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return ret;
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}
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if (bl_data > 127) {
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bl_data = 127;
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}
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ts->bl_ready = 0;
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ts->backlight_req = bl_data + 0x80U;
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ret = wait_event_interruptible_timeout(bl_waitq, ts->bl_ready, HZ);
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if (ret < 0) {
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printk(KERN_INFO "wait_event_interruptible_timeout error!\n");
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return ret;
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} else if (ret == 0) {
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printk(KERN_INFO "time out error!\n");
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return -ETIMEDOUT;
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} else {
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return 0;
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}
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}
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EXPORT_SYMBOL(wire1_backlight_control);
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static inline void notify_bl_data(struct ts_1wire_t *ts, u8 a, u8 b, u8 c)
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{
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ts->bl_ready = 1;
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wake_up_interruptible(&bl_waitq);
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}
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static int bl_open(struct inode *inode, struct file *filp)
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{
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int status = -ENXIO;
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struct ts_1wire_t *ts = NULL;
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mutex_lock(&wire1_ts_list_lock);
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list_for_each_entry(ts, &wire1_ts_list, device_entry) {
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if(strcmp(ts->name, TS_1WIRE_NAME) == 0) {
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status = 0;
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break;
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}
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}
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mutex_unlock(&wire1_ts_list_lock);
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if (status == 0) {
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filp->private_data = ts;
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} else {
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return status;
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}
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return nonseekable_open(inode, filp);
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}
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static ssize_t bl_write(struct file *filp, const char __user *buffer, size_t count, loff_t *ppos)
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{
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int ret = 0;
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u8 bl_data = 0;
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struct ts_1wire_t *ts = filp->private_data;
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DBG("bl_write start\n");
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if (get_user(bl_data, (u8 __user *)buffer)) {
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printk(KERN_INFO "get_user error!\n");
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return -EFAULT;
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}
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if (bl_data > 127) {
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bl_data = 127;
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}
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ts->bl_ready = 0;
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ts->backlight_req = bl_data + 0x80U;
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ret = wait_event_interruptible_timeout(bl_waitq, ts->bl_ready, HZ);
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if (ret < 0) {
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printk(KERN_INFO "wait_event_interruptible_timeout error!\n");
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return ret;
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} else if (ret == 0) {
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printk(KERN_INFO "time out error!\n");
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return -ETIMEDOUT;
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} else {
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return count;
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}
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}
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static struct file_operations bl_fops = {
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owner : THIS_MODULE,
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write : bl_write,
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open : bl_open,
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};
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static struct miscdevice bl_misc = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = BACKLIGHT_DEVICE_NAME,
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.fops = &bl_fops,
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};
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/* backlight driver user interface end */
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static void gsc3280_report_event(struct ts_1wire_t *ts, u32 z)
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{
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#ifdef CONFIG_GSC3280_POS_PRINT
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printk(KERN_INFO "x = %d\n", ts->x);
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printk(KERN_INFO "y = %d\n", ts->y);
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printk(KERN_INFO "z = %d\n", z);
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#endif
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input_report_abs(ts->input, ABS_PRESSURE, z);
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input_report_abs(ts->input, ABS_X, ts->x);
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input_report_abs(ts->input, ABS_Y, ts->y);
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if (z > 0)
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input_report_key(ts->input, BTN_TOUCH, 1);
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else
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input_report_key(ts->input, BTN_TOUCH, 0);
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input_sync(ts->input);
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}
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static inline void notify_ts_data(struct ts_1wire_t *ts)
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{
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if (ts->z == 1) {
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ts->x = ((ts->x -285) * gXres) / (3944 - 285);
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ts->y = ((3936 - ts->y) * gYres) / (3936 - 102);
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if ((ts->x > 0) && (ts->x < gXres) && (ts->y > 0) && (ts->y < gYres)) {
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if (ts->flg == 0) {
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ts->flg = 1;
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gsc3280_report_event(ts, 0);
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}
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gsc3280_report_event(ts, ts->z);
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ts->old_x = ts->x;
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ts->old_y = ts->y;
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}
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} else if (ts->z == 0) {
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if (ts->flg == 1) {
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ts->flg = 0;
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ts->x = ts->old_x;
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ts->y = ts->old_y;
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gsc3280_report_event(ts, 0);
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}
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}
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}
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static inline void notify_info_data(struct ts_1wire_t *ts, unsigned char lcd_type,
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unsigned char ver_year, unsigned char week)
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{
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if (lcd_type != 0xFF) {
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ts->lcd_type = lcd_type;
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//firmware_ver = ver_year * 100 + week;
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}
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}
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static void one_wire_session_complete(struct ts_1wire_t *ts)
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{
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u8 crc = 0;
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const unsigned char *p = (const u8*)&(ts->io_data);
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crc8_init(crc);
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crc8(crc, p[3]);
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crc8(crc, p[2]);
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crc8(crc, p[1]);
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if (crc != p[0]) {
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DBG("one_wire_session_complete crc error\n");
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return;
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}
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switch(ts->req) {
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case REQ_TS:
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ts->x = ((p[3] >> 4U) << 8U) + p[2];
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ts->y = ((p[3] & 0xFU) << 8U) + p[1];
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ts->z = (ts->x != 0xFFFU) && (ts->y != 0xFFFU);
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notify_ts_data(ts);
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break;
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case REQ_INFO:
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notify_info_data(ts, p[3], p[2], p[1]);
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break;
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default:
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notify_bl_data(ts, p[3], p[2], p[1]);
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break;
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}
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}
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//Pin access
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static inline void set_pin_up(void)
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{
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}
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static inline void set_pin_as_input(void)
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{
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gpio_direction_input(TS_1WIRE_DATA_PIN);
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}
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static inline void set_pin_as_output(void)
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{
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gpio_direction_output(TS_1WIRE_DATA_PIN, 1);
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}
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static inline void set_pin_value(int v)
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{
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if (v) {
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gpio_set_value(TS_1WIRE_DATA_PIN, 1);
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} else {
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gpio_set_value(TS_1WIRE_DATA_PIN, 0);
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}
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}
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static inline int get_pin_value(void)
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{
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return gpio_get_value(TS_1WIRE_DATA_PIN);
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}
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static void ts_1wire_hardtimer_callback(unsigned long data)
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{
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struct ts_1wire_t *ts = (struct ts_1wire_t *)data;
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//DBG("ts_1wire_hardtimer_callback start\n");
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ts->io_bit_count--;
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switch(ts->one_wire_status) {
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case START:
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//DBG("START\n");
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if (ts->io_bit_count == 0) {
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ts->io_bit_count = 16;
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ts->one_wire_status = REQUEST;
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}
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break;
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case REQUEST:
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//Send a bit
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//DBG("REQUEST\n");
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set_pin_value(ts->io_data & (1U << 31));
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ts->io_data <<= 1;
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if (ts->io_bit_count == 0) {
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ts->io_bit_count = 2;
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ts->one_wire_status = WAITING;
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}
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break;
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case WAITING:
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//DBG("WAITING\n");
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if (ts->io_bit_count == 0) {
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ts->io_bit_count = 32;
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ts->one_wire_status = RESPONSE;
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}
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else if (ts->io_bit_count == 1) {
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set_pin_as_input();
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set_pin_value(1);
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}
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break;
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case RESPONSE:
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//Get a bit
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//DBG("RESPONSE\n");
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ts->io_data = (ts->io_data << 1) | get_pin_value();
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if (ts->io_bit_count == 0) {
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ts->io_bit_count = 2;
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ts->one_wire_status = STOPING;
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set_pin_value(1);
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set_pin_as_output();
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one_wire_session_complete(ts);
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}
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break;
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case STOPING:
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//DBG("STOPING\n");
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if (ts->io_bit_count == 0) {
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ts->one_wire_status = IDLE;
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gsc3280_timer_stop(&ts->ts_hard_timer);
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mod_timer(&ts_1wire_timer, jiffies + TIMER_DELAY);
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}
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break;
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default:
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//DBG("default\n");
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gsc3280_timer_stop(&ts->ts_hard_timer);
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mod_timer(&ts_1wire_timer, jiffies + TIMER_DELAY);
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break;
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}
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}
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static void init_hard_timer_for_1wire(struct ts_1wire_t *ts)
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{
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ts->ts_hard_timer.type = LOOP;
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ts->ts_hard_timer.value_type = 1;
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ts->ts_hard_timer.bps = SAMPLE_BPS;
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ts->ts_hard_timer.function = ts_1wire_hardtimer_callback;
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ts->ts_hard_timer.data = (unsigned long)ts;
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}
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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<apple_guet@126.com>");
|
|
MODULE_DESCRIPTION("GSC3280 one wire ts Driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("gsc3280 one wire ts");
|
|
|