473 lines
11 KiB
C
473 lines
11 KiB
C
/*
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* Copyright (C) 2007-2008 HTC Corporation.
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*
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* Copyright (C) 2013-2015 Freescale Semiconductor, Inc.
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*
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* This driver is adapted from elan8232_i2c.c written by Shan-Fu Chiou
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* <sfchiou@gmail.com> and Jay Tu <jay_tu@htc.com>.
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* This driver is also adapted from the ELAN Touch Screen driver
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* written by Stanley Zeng <stanley.zeng@emc.com.tw>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/input.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <linux/hrtimer.h>
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#include <linux/of_gpio.h>
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#include <linux/regulator/consumer.h>
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#include <linux/gpio.h>
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static const char ELAN_TS_NAME[] = "elan-touch";
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#define ELAN_TS_X_MAX 1088
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#define ELAN_TS_Y_MAX 768
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#define ELAN_USER_X_MAX 800
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#define ELAN_USER_Y_MAX 600
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#define IDX_PACKET_SIZE 8
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enum {
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hello_packet = 0x55,
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idx_coordinate_packet = 0x5a,
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};
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enum {
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idx_finger_state = 7,
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};
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static struct workqueue_struct *elan_wq;
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static struct elan_data {
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int intr_gpio;
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int use_irq;
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struct hrtimer timer;
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struct work_struct work;
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struct i2c_client *client;
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struct input_dev *input;
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wait_queue_head_t wait;
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} elan_touch_data;
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/*--------------------------------------------------------------*/
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static int elan_touch_detect_int_level(void)
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{
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int v;
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v = gpio_get_value(elan_touch_data.intr_gpio);
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return v;
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}
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static int __elan_touch_poll(struct i2c_client *client)
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{
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int status = 0, retry = 20;
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do {
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status = elan_touch_detect_int_level();
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retry--;
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mdelay(20);
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} while (status == 1 && retry > 0);
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return status == 0 ? 0 : -ETIMEDOUT;
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}
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static int elan_touch_poll(struct i2c_client *client)
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{
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return __elan_touch_poll(client);
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}
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static int __hello_packet_handler(struct i2c_client *client)
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{
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int rc;
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uint8_t buf_recv[4] = { 0 };
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rc = elan_touch_poll(client);
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if (rc < 0)
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return -EINVAL;
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rc = i2c_master_recv(client, buf_recv, 4);
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if (rc != 4) {
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return rc;
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} else {
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int i;
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pr_info("hello packet: [0x%02x 0x%02x 0x%02x 0x%02x]\n",
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buf_recv[0], buf_recv[1], buf_recv[2], buf_recv[3]);
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for (i = 0; i < 4; i++)
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if (buf_recv[i] != hello_packet)
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return -EINVAL;
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}
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return 0;
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}
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static inline int elan_touch_parse_xy(uint8_t *data, uint16_t *x,
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uint16_t *y)
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{
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*x = (data[0] & 0xf0);
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*x <<= 4;
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*x |= data[1];
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if (*x >= ELAN_TS_X_MAX)
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*x = ELAN_TS_X_MAX;
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*x = ((((ELAN_TS_X_MAX -
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*x) * 1000) / ELAN_TS_X_MAX) * ELAN_USER_X_MAX) / 1000;
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*y = (data[0] & 0x0f);
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*y <<= 8;
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*y |= data[2];
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if (*y >= ELAN_TS_Y_MAX)
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*y = ELAN_TS_Y_MAX;
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*y = ((((ELAN_TS_Y_MAX -
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*y) * 1000) / ELAN_TS_Y_MAX) * ELAN_USER_Y_MAX) / 1000;
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return 0;
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}
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/* __elan_touch_init -- hand shaking with touch panel
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*
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* 1.recv hello packet
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*/
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static int __elan_touch_init(struct i2c_client *client)
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{
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int rc;
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rc = __hello_packet_handler(client);
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if (rc < 0)
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goto hand_shake_failed;
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hand_shake_failed:
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return rc;
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}
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static int elan_touch_recv_data(struct i2c_client *client, uint8_t *buf)
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{
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int rc, bytes_to_recv = IDX_PACKET_SIZE;
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if (buf == NULL)
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return -EINVAL;
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memset(buf, 0, bytes_to_recv);
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rc = i2c_master_recv(client, buf, bytes_to_recv);
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if (rc != bytes_to_recv)
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return -EINVAL;
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return rc;
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}
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static void elan_touch_report_data(struct i2c_client *client, uint8_t *buf)
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{
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switch (buf[0]) {
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case idx_coordinate_packet:
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{
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uint16_t x1, x2, y1, y2;
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uint8_t finger_stat;
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finger_stat = (buf[idx_finger_state] & 0x06) >> 1;
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if (finger_stat == 0) {
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input_report_key(elan_touch_data.input, BTN_TOUCH, 0);
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input_report_key(elan_touch_data.input, BTN_2, 0);
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} else if (finger_stat == 1) {
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elan_touch_parse_xy(&buf[1], &x1, &y1);
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input_report_abs(elan_touch_data.input, ABS_X, x1);
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input_report_abs(elan_touch_data.input, ABS_Y, y1);
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input_report_key(elan_touch_data.input, BTN_TOUCH, 1);
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input_report_key(elan_touch_data.input, BTN_2, 0);
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} else if (finger_stat == 2) {
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elan_touch_parse_xy(&buf[1], &x1, &y1);
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input_report_abs(elan_touch_data.input, ABS_X, x1);
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input_report_abs(elan_touch_data.input, ABS_Y, y1);
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input_report_key(elan_touch_data.input, BTN_TOUCH, 1);
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elan_touch_parse_xy(&buf[4], &x2, &y2);
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input_report_abs(elan_touch_data.input, ABS_HAT0X, x2);
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input_report_abs(elan_touch_data.input, ABS_HAT0Y, y2);
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input_report_key(elan_touch_data.input, BTN_2, 1);
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}
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input_sync(elan_touch_data.input);
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break;
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}
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default:
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break;
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}
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}
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static void elan_touch_work_func(struct work_struct *work)
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{
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int rc;
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uint8_t buf[IDX_PACKET_SIZE] = { 0 };
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struct i2c_client *client = elan_touch_data.client;
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if (elan_touch_detect_int_level())
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return;
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rc = elan_touch_recv_data(client, buf);
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if (rc < 0)
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return;
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elan_touch_report_data(client, buf);
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}
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static irqreturn_t elan_touch_ts_interrupt(int irq, void *dev_id)
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{
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queue_work(elan_wq, &elan_touch_data.work);
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return IRQ_HANDLED;
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}
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static enum hrtimer_restart elan_touch_timer_func(struct hrtimer *timer)
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{
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queue_work(elan_wq, &elan_touch_data.work);
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hrtimer_start(&elan_touch_data.timer, ktime_set(0, 12500000),
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HRTIMER_MODE_REL);
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return HRTIMER_NORESTART;
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}
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static int elan_touch_register_interrupt(struct i2c_client *client)
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{
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int err = 0;
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if (client->irq) {
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elan_touch_data.use_irq = 1;
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err =
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request_irq(client->irq, elan_touch_ts_interrupt,
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IRQF_TRIGGER_FALLING, ELAN_TS_NAME,
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&elan_touch_data);
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if (err < 0) {
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pr_info("%s(%s): Can't allocate irq %d\n", __FILE__,
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__func__, client->irq);
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elan_touch_data.use_irq = 0;
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}
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}
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if (!elan_touch_data.use_irq) {
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hrtimer_init(&elan_touch_data.timer, CLOCK_MONOTONIC,
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HRTIMER_MODE_REL);
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elan_touch_data.timer.function = elan_touch_timer_func;
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hrtimer_start(&elan_touch_data.timer, ktime_set(1, 0),
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HRTIMER_MODE_REL);
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}
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pr_info("elan ts starts in %s mode.\n",
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elan_touch_data.use_irq == 1 ? "interrupt" : "polling");
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return 0;
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}
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static int elan_touch_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device_node *np = client->dev.of_node;
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int gpio_elan_cs, gpio_elan_rst, err = 0;
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if (!np)
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return -ENODEV;
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elan_touch_data.intr_gpio = of_get_named_gpio(np, "gpio_intr", 0);
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if (!gpio_is_valid(elan_touch_data.intr_gpio))
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return -ENODEV;
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err = devm_gpio_request_one(&client->dev, elan_touch_data.intr_gpio,
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GPIOF_IN, "gpio_elan_intr");
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if (err < 0) {
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dev_err(&client->dev,
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"request gpio failed: %d\n", err);
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return err;
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}
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/* elan touch init */
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gpio_elan_cs = of_get_named_gpio(np, "gpio_elan_cs", 0);
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if (!gpio_is_valid(gpio_elan_cs))
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return -ENODEV;
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err = devm_gpio_request_one(&client->dev, gpio_elan_cs,
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GPIOF_OUT_INIT_HIGH, "gpio_elan_cs");
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if (err < 0) {
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dev_err(&client->dev,
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"request gpio failed: %d\n", err);
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return err;
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}
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gpio_set_value(gpio_elan_cs, 0);
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gpio_elan_rst = of_get_named_gpio(np, "gpio_elan_rst", 0);
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if (!gpio_is_valid(gpio_elan_rst))
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return -ENODEV;
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err = devm_gpio_request_one(&client->dev, gpio_elan_rst,
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GPIOF_OUT_INIT_HIGH, "gpio_elan_rst");
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if (err < 0) {
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dev_err(&client->dev,
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"request gpio failed: %d\n", err);
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return err;
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}
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gpio_set_value(gpio_elan_rst, 0);
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msleep(10);
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gpio_set_value(gpio_elan_rst, 1);
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gpio_set_value(gpio_elan_cs, 1);
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msleep(100);
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elan_wq = create_singlethread_workqueue("elan_wq");
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if (!elan_wq) {
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err = -ENOMEM;
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goto fail;
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}
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elan_touch_data.client = client;
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strlcpy(client->name, ELAN_TS_NAME, I2C_NAME_SIZE);
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INIT_WORK(&elan_touch_data.work, elan_touch_work_func);
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elan_touch_data.input = input_allocate_device();
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if (elan_touch_data.input == NULL) {
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err = -ENOMEM;
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goto fail;
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}
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err = __elan_touch_init(client);
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if (err < 0) {
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dev_err(&client->dev, "elan - Read Hello Packet Failed\n");
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goto fail;
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}
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elan_touch_data.input->name = ELAN_TS_NAME;
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elan_touch_data.input->id.bustype = BUS_I2C;
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set_bit(EV_SYN, elan_touch_data.input->evbit);
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set_bit(EV_KEY, elan_touch_data.input->evbit);
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set_bit(BTN_TOUCH, elan_touch_data.input->keybit);
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set_bit(BTN_2, elan_touch_data.input->keybit);
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set_bit(EV_ABS, elan_touch_data.input->evbit);
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set_bit(ABS_X, elan_touch_data.input->absbit);
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set_bit(ABS_Y, elan_touch_data.input->absbit);
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set_bit(ABS_HAT0X, elan_touch_data.input->absbit);
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set_bit(ABS_HAT0Y, elan_touch_data.input->absbit);
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input_set_abs_params(elan_touch_data.input, ABS_X, 0, ELAN_USER_X_MAX,
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0, 0);
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input_set_abs_params(elan_touch_data.input, ABS_Y, 0, ELAN_USER_Y_MAX,
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0, 0);
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input_set_abs_params(elan_touch_data.input, ABS_HAT0X, 0,
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ELAN_USER_X_MAX, 0, 0);
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input_set_abs_params(elan_touch_data.input, ABS_HAT0Y, 0,
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ELAN_USER_Y_MAX, 0, 0);
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err = input_register_device(elan_touch_data.input);
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if (err < 0)
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goto fail;
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elan_touch_register_interrupt(elan_touch_data.client);
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return 0;
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fail:
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input_free_device(elan_touch_data.input);
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if (elan_wq)
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destroy_workqueue(elan_wq);
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return err;
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}
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static int elan_touch_remove(struct i2c_client *client)
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{
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if (elan_wq)
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destroy_workqueue(elan_wq);
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input_unregister_device(elan_touch_data.input);
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if (elan_touch_data.use_irq)
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free_irq(client->irq, client);
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else
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hrtimer_cancel(&elan_touch_data.timer);
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return 0;
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}
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/* -------------------------------------------------------------------- */
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static const struct i2c_device_id elan_touch_id[] = {
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{"elan-touch", 0},
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{}
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};
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static const struct of_device_id elan_dt_ids[] = {
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{
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.compatible = "elan,elan-touch",
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}, {
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/* sentinel */
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}
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};
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MODULE_DEVICE_TABLE(of, elan_dt_ids);
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static int elan_suspend(struct device *dev)
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{
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return 0;
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}
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static int elan_resume(struct device *dev)
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{
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uint8_t buf[IDX_PACKET_SIZE] = { 0 };
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if (0 == elan_touch_detect_int_level()) {
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dev_dbg(dev, "Got touch during suspend period.\n");
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/*
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* if touch screen during suspend, recv and drop the
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* data, then touch interrupt pin will return high after
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* receving data.
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*/
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elan_touch_recv_data(elan_touch_data.client, buf);
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}
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return 0;
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}
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static const struct dev_pm_ops elan_dev_pm_ops = {
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.suspend = elan_suspend,
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.resume = elan_resume,
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};
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static struct i2c_driver elan_touch_driver = {
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.probe = elan_touch_probe,
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.remove = elan_touch_remove,
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.id_table = elan_touch_id,
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.driver = {
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.name = "elan-touch",
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.owner = THIS_MODULE,
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.of_match_table = elan_dt_ids,
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#ifdef CONFIG_PM
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.pm = &elan_dev_pm_ops,
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#endif
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},
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};
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static int __init elan_touch_init(void)
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{
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return i2c_add_driver(&elan_touch_driver);
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}
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static void __exit elan_touch_exit(void)
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{
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i2c_del_driver(&elan_touch_driver);
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}
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module_init(elan_touch_init);
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module_exit(elan_touch_exit);
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MODULE_AUTHOR("Stanley Zeng <stanley.zeng@emc.com.tw>");
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MODULE_DESCRIPTION("ELAN Touch Screen driver");
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MODULE_LICENSE("GPL");
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