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![Hans de Goede](/assets/img/avatar_default.png)
Extend touchscreen_parse_properties() with support for the touchscreen-inverted-x/y and touchscreen-swapped-x-y properties and add touchscreen_set_mt_pos() and touchscreen_report_pos() helper functions for storing coordinates into a input_mt_pos struct, or directly reporting them, taking these properties into account. This commit also modifies the existing callers of touchscreen_parse_properties() to pass in NULL for the new third argument, keeping the existing behavior. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
698 lines
16 KiB
C
698 lines
16 KiB
C
/*
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* Core Source for:
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* Cypress TrueTouch(TM) Standard Product (TTSP) touchscreen drivers.
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* For use with Cypress Txx3xx parts.
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* Supported parts include:
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* CY8CTST341
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* CY8CTMA340
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*
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* Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
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* Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2, and only version 2, as published by the
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* Free Software Foundation.
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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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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com>
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*
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*/
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#include <linux/delay.h>
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#include <linux/input.h>
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#include <linux/input/mt.h>
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#include <linux/input/touchscreen.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/property.h>
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#include <linux/gpio/consumer.h>
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#include "cyttsp_core.h"
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/* Bootloader number of command keys */
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#define CY_NUM_BL_KEYS 8
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/* helpers */
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#define GET_NUM_TOUCHES(x) ((x) & 0x0F)
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#define IS_LARGE_AREA(x) (((x) & 0x10) >> 4)
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#define IS_BAD_PKT(x) ((x) & 0x20)
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#define IS_VALID_APP(x) ((x) & 0x01)
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#define IS_OPERATIONAL_ERR(x) ((x) & 0x3F)
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#define GET_HSTMODE(reg) (((reg) & 0x70) >> 4)
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#define GET_BOOTLOADERMODE(reg) (((reg) & 0x10) >> 4)
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#define CY_REG_BASE 0x00
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#define CY_REG_ACT_DIST 0x1E
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#define CY_REG_ACT_INTRVL 0x1D
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#define CY_REG_TCH_TMOUT (CY_REG_ACT_INTRVL + 1)
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#define CY_REG_LP_INTRVL (CY_REG_TCH_TMOUT + 1)
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#define CY_MAXZ 255
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#define CY_DELAY_DFLT 20 /* ms */
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#define CY_DELAY_MAX 500
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#define CY_ACT_DIST_DFLT 0xF8
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#define CY_ACT_DIST_MASK 0x0F
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#define CY_HNDSHK_BIT 0x80
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/* device mode bits */
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#define CY_OPERATE_MODE 0x00
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#define CY_SYSINFO_MODE 0x10
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/* power mode select bits */
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#define CY_SOFT_RESET_MODE 0x01 /* return to Bootloader mode */
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#define CY_DEEP_SLEEP_MODE 0x02
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#define CY_LOW_POWER_MODE 0x04
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/* Slots management */
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#define CY_MAX_FINGER 4
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#define CY_MAX_ID 16
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static const u8 bl_command[] = {
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0x00, /* file offset */
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0xFF, /* command */
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0xA5, /* exit bootloader command */
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0, 1, 2, 3, 4, 5, 6, 7 /* default keys */
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};
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static int ttsp_read_block_data(struct cyttsp *ts, u8 command,
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u8 length, void *buf)
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{
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int error;
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int tries;
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for (tries = 0; tries < CY_NUM_RETRY; tries++) {
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error = ts->bus_ops->read(ts->dev, ts->xfer_buf, command,
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length, buf);
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if (!error)
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return 0;
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msleep(CY_DELAY_DFLT);
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}
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return -EIO;
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}
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static int ttsp_write_block_data(struct cyttsp *ts, u8 command,
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u8 length, void *buf)
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{
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int error;
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int tries;
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for (tries = 0; tries < CY_NUM_RETRY; tries++) {
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error = ts->bus_ops->write(ts->dev, ts->xfer_buf, command,
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length, buf);
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if (!error)
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return 0;
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msleep(CY_DELAY_DFLT);
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}
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return -EIO;
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}
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static int ttsp_send_command(struct cyttsp *ts, u8 cmd)
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{
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return ttsp_write_block_data(ts, CY_REG_BASE, sizeof(cmd), &cmd);
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}
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static int cyttsp_handshake(struct cyttsp *ts)
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{
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if (ts->use_hndshk)
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return ttsp_send_command(ts,
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ts->xy_data.hst_mode ^ CY_HNDSHK_BIT);
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return 0;
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}
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static int cyttsp_load_bl_regs(struct cyttsp *ts)
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{
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memset(&ts->bl_data, 0, sizeof(ts->bl_data));
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ts->bl_data.bl_status = 0x10;
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return ttsp_read_block_data(ts, CY_REG_BASE,
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sizeof(ts->bl_data), &ts->bl_data);
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}
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static int cyttsp_exit_bl_mode(struct cyttsp *ts)
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{
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int error;
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u8 bl_cmd[sizeof(bl_command)];
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memcpy(bl_cmd, bl_command, sizeof(bl_command));
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if (ts->bl_keys)
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memcpy(&bl_cmd[sizeof(bl_command) - CY_NUM_BL_KEYS],
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ts->bl_keys, CY_NUM_BL_KEYS);
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error = ttsp_write_block_data(ts, CY_REG_BASE,
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sizeof(bl_cmd), bl_cmd);
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if (error)
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return error;
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/* wait for TTSP Device to complete the operation */
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msleep(CY_DELAY_DFLT);
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error = cyttsp_load_bl_regs(ts);
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if (error)
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return error;
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if (GET_BOOTLOADERMODE(ts->bl_data.bl_status))
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return -EIO;
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return 0;
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}
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static int cyttsp_set_operational_mode(struct cyttsp *ts)
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{
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int error;
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error = ttsp_send_command(ts, CY_OPERATE_MODE);
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if (error)
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return error;
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/* wait for TTSP Device to complete switch to Operational mode */
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error = ttsp_read_block_data(ts, CY_REG_BASE,
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sizeof(ts->xy_data), &ts->xy_data);
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if (error)
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return error;
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error = cyttsp_handshake(ts);
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if (error)
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return error;
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return ts->xy_data.act_dist == CY_ACT_DIST_DFLT ? -EIO : 0;
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}
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static int cyttsp_set_sysinfo_mode(struct cyttsp *ts)
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{
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int error;
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memset(&ts->sysinfo_data, 0, sizeof(ts->sysinfo_data));
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/* switch to sysinfo mode */
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error = ttsp_send_command(ts, CY_SYSINFO_MODE);
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if (error)
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return error;
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/* read sysinfo registers */
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msleep(CY_DELAY_DFLT);
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error = ttsp_read_block_data(ts, CY_REG_BASE, sizeof(ts->sysinfo_data),
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&ts->sysinfo_data);
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if (error)
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return error;
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error = cyttsp_handshake(ts);
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if (error)
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return error;
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if (!ts->sysinfo_data.tts_verh && !ts->sysinfo_data.tts_verl)
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return -EIO;
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return 0;
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}
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static int cyttsp_set_sysinfo_regs(struct cyttsp *ts)
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{
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int retval = 0;
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if (ts->act_intrvl != CY_ACT_INTRVL_DFLT ||
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ts->tch_tmout != CY_TCH_TMOUT_DFLT ||
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ts->lp_intrvl != CY_LP_INTRVL_DFLT) {
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u8 intrvl_ray[] = {
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ts->act_intrvl,
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ts->tch_tmout,
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ts->lp_intrvl
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};
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/* set intrvl registers */
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retval = ttsp_write_block_data(ts, CY_REG_ACT_INTRVL,
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sizeof(intrvl_ray), intrvl_ray);
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msleep(CY_DELAY_DFLT);
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}
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return retval;
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}
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static void cyttsp_hard_reset(struct cyttsp *ts)
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{
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if (ts->reset_gpio) {
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gpiod_set_value_cansleep(ts->reset_gpio, 1);
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msleep(CY_DELAY_DFLT);
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gpiod_set_value_cansleep(ts->reset_gpio, 0);
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msleep(CY_DELAY_DFLT);
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}
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}
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static int cyttsp_soft_reset(struct cyttsp *ts)
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{
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unsigned long timeout;
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int retval;
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/* wait for interrupt to set ready completion */
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reinit_completion(&ts->bl_ready);
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ts->state = CY_BL_STATE;
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enable_irq(ts->irq);
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retval = ttsp_send_command(ts, CY_SOFT_RESET_MODE);
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if (retval)
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goto out;
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timeout = wait_for_completion_timeout(&ts->bl_ready,
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msecs_to_jiffies(CY_DELAY_DFLT * CY_DELAY_MAX));
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retval = timeout ? 0 : -EIO;
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out:
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ts->state = CY_IDLE_STATE;
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disable_irq(ts->irq);
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return retval;
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}
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static int cyttsp_act_dist_setup(struct cyttsp *ts)
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{
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u8 act_dist_setup = ts->act_dist;
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/* Init gesture; active distance setup */
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return ttsp_write_block_data(ts, CY_REG_ACT_DIST,
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sizeof(act_dist_setup), &act_dist_setup);
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}
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static void cyttsp_extract_track_ids(struct cyttsp_xydata *xy_data, int *ids)
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{
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ids[0] = xy_data->touch12_id >> 4;
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ids[1] = xy_data->touch12_id & 0xF;
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ids[2] = xy_data->touch34_id >> 4;
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ids[3] = xy_data->touch34_id & 0xF;
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}
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static const struct cyttsp_tch *cyttsp_get_tch(struct cyttsp_xydata *xy_data,
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int idx)
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{
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switch (idx) {
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case 0:
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return &xy_data->tch1;
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case 1:
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return &xy_data->tch2;
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case 2:
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return &xy_data->tch3;
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case 3:
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return &xy_data->tch4;
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default:
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return NULL;
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}
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}
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static void cyttsp_report_tchdata(struct cyttsp *ts)
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{
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struct cyttsp_xydata *xy_data = &ts->xy_data;
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struct input_dev *input = ts->input;
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int num_tch = GET_NUM_TOUCHES(xy_data->tt_stat);
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const struct cyttsp_tch *tch;
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int ids[CY_MAX_ID];
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int i;
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DECLARE_BITMAP(used, CY_MAX_ID);
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if (IS_LARGE_AREA(xy_data->tt_stat) == 1) {
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/* terminate all active tracks */
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num_tch = 0;
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dev_dbg(ts->dev, "%s: Large area detected\n", __func__);
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} else if (num_tch > CY_MAX_FINGER) {
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/* terminate all active tracks */
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num_tch = 0;
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dev_dbg(ts->dev, "%s: Num touch error detected\n", __func__);
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} else if (IS_BAD_PKT(xy_data->tt_mode)) {
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/* terminate all active tracks */
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num_tch = 0;
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dev_dbg(ts->dev, "%s: Invalid buffer detected\n", __func__);
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}
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cyttsp_extract_track_ids(xy_data, ids);
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bitmap_zero(used, CY_MAX_ID);
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for (i = 0; i < num_tch; i++) {
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tch = cyttsp_get_tch(xy_data, i);
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input_mt_slot(input, ids[i]);
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input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
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input_report_abs(input, ABS_MT_POSITION_X, be16_to_cpu(tch->x));
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input_report_abs(input, ABS_MT_POSITION_Y, be16_to_cpu(tch->y));
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input_report_abs(input, ABS_MT_TOUCH_MAJOR, tch->z);
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__set_bit(ids[i], used);
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}
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for (i = 0; i < CY_MAX_ID; i++) {
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if (test_bit(i, used))
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continue;
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input_mt_slot(input, i);
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input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
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}
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input_sync(input);
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}
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static irqreturn_t cyttsp_irq(int irq, void *handle)
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{
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struct cyttsp *ts = handle;
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int error;
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if (unlikely(ts->state == CY_BL_STATE)) {
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complete(&ts->bl_ready);
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goto out;
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}
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/* Get touch data from CYTTSP device */
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error = ttsp_read_block_data(ts, CY_REG_BASE,
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sizeof(struct cyttsp_xydata), &ts->xy_data);
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if (error)
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goto out;
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/* provide flow control handshake */
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error = cyttsp_handshake(ts);
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if (error)
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goto out;
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if (unlikely(ts->state == CY_IDLE_STATE))
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goto out;
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if (GET_BOOTLOADERMODE(ts->xy_data.tt_mode)) {
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/*
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* TTSP device has reset back to bootloader mode.
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* Restore to operational mode.
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*/
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error = cyttsp_exit_bl_mode(ts);
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if (error) {
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dev_err(ts->dev,
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"Could not return to operational mode, err: %d\n",
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error);
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ts->state = CY_IDLE_STATE;
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}
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} else {
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cyttsp_report_tchdata(ts);
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}
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out:
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return IRQ_HANDLED;
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}
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static int cyttsp_power_on(struct cyttsp *ts)
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{
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int error;
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error = cyttsp_soft_reset(ts);
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if (error)
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return error;
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error = cyttsp_load_bl_regs(ts);
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if (error)
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return error;
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if (GET_BOOTLOADERMODE(ts->bl_data.bl_status) &&
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IS_VALID_APP(ts->bl_data.bl_status)) {
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error = cyttsp_exit_bl_mode(ts);
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if (error)
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return error;
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}
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if (GET_HSTMODE(ts->bl_data.bl_file) != CY_OPERATE_MODE ||
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IS_OPERATIONAL_ERR(ts->bl_data.bl_status)) {
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return -ENODEV;
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}
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error = cyttsp_set_sysinfo_mode(ts);
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if (error)
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return error;
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error = cyttsp_set_sysinfo_regs(ts);
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if (error)
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return error;
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error = cyttsp_set_operational_mode(ts);
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if (error)
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return error;
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/* init active distance */
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error = cyttsp_act_dist_setup(ts);
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if (error)
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return error;
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ts->state = CY_ACTIVE_STATE;
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return 0;
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}
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static int cyttsp_enable(struct cyttsp *ts)
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{
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int error;
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/*
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* The device firmware can wake on an I2C or SPI memory slave
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* address match. So just reading a register is sufficient to
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* wake up the device. The first read attempt will fail but it
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* will wake it up making the second read attempt successful.
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*/
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error = ttsp_read_block_data(ts, CY_REG_BASE,
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sizeof(ts->xy_data), &ts->xy_data);
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if (error)
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return error;
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if (GET_HSTMODE(ts->xy_data.hst_mode))
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return -EIO;
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enable_irq(ts->irq);
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return 0;
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}
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static int cyttsp_disable(struct cyttsp *ts)
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{
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int error;
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error = ttsp_send_command(ts, CY_LOW_POWER_MODE);
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if (error)
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return error;
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disable_irq(ts->irq);
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return 0;
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}
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static int __maybe_unused cyttsp_suspend(struct device *dev)
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{
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struct cyttsp *ts = dev_get_drvdata(dev);
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int retval = 0;
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mutex_lock(&ts->input->mutex);
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if (ts->input->users) {
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retval = cyttsp_disable(ts);
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if (retval == 0)
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ts->suspended = true;
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}
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mutex_unlock(&ts->input->mutex);
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return retval;
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}
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static int __maybe_unused cyttsp_resume(struct device *dev)
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{
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struct cyttsp *ts = dev_get_drvdata(dev);
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mutex_lock(&ts->input->mutex);
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if (ts->input->users)
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cyttsp_enable(ts);
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ts->suspended = false;
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mutex_unlock(&ts->input->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
SIMPLE_DEV_PM_OPS(cyttsp_pm_ops, cyttsp_suspend, cyttsp_resume);
|
|
EXPORT_SYMBOL_GPL(cyttsp_pm_ops);
|
|
|
|
static int cyttsp_open(struct input_dev *dev)
|
|
{
|
|
struct cyttsp *ts = input_get_drvdata(dev);
|
|
int retval = 0;
|
|
|
|
if (!ts->suspended)
|
|
retval = cyttsp_enable(ts);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void cyttsp_close(struct input_dev *dev)
|
|
{
|
|
struct cyttsp *ts = input_get_drvdata(dev);
|
|
|
|
if (!ts->suspended)
|
|
cyttsp_disable(ts);
|
|
}
|
|
|
|
static int cyttsp_parse_properties(struct cyttsp *ts)
|
|
{
|
|
struct device *dev = ts->dev;
|
|
u32 dt_value;
|
|
int ret;
|
|
|
|
ts->bl_keys = devm_kzalloc(dev, CY_NUM_BL_KEYS, GFP_KERNEL);
|
|
if (!ts->bl_keys)
|
|
return -ENOMEM;
|
|
|
|
/* Set some default values */
|
|
ts->use_hndshk = false;
|
|
ts->act_dist = CY_ACT_DIST_DFLT;
|
|
ts->act_intrvl = CY_ACT_INTRVL_DFLT;
|
|
ts->tch_tmout = CY_TCH_TMOUT_DFLT;
|
|
ts->lp_intrvl = CY_LP_INTRVL_DFLT;
|
|
|
|
ret = device_property_read_u8_array(dev, "bootloader-key",
|
|
ts->bl_keys, CY_NUM_BL_KEYS);
|
|
if (ret) {
|
|
dev_err(dev,
|
|
"bootloader-key property could not be retrieved\n");
|
|
return ret;
|
|
}
|
|
|
|
ts->use_hndshk = device_property_present(dev, "use-handshake");
|
|
|
|
if (!device_property_read_u32(dev, "active-distance", &dt_value)) {
|
|
if (dt_value > 15) {
|
|
dev_err(dev, "active-distance (%u) must be [0-15]\n",
|
|
dt_value);
|
|
return -EINVAL;
|
|
}
|
|
ts->act_dist &= ~CY_ACT_DIST_MASK;
|
|
ts->act_dist |= dt_value;
|
|
}
|
|
|
|
if (!device_property_read_u32(dev, "active-interval-ms", &dt_value)) {
|
|
if (dt_value > 255) {
|
|
dev_err(dev, "active-interval-ms (%u) must be [0-255]\n",
|
|
dt_value);
|
|
return -EINVAL;
|
|
}
|
|
ts->act_intrvl = dt_value;
|
|
}
|
|
|
|
if (!device_property_read_u32(dev, "lowpower-interval-ms", &dt_value)) {
|
|
if (dt_value > 2550) {
|
|
dev_err(dev, "lowpower-interval-ms (%u) must be [0-2550]\n",
|
|
dt_value);
|
|
return -EINVAL;
|
|
}
|
|
/* Register value is expressed in 0.01s / bit */
|
|
ts->lp_intrvl = dt_value / 10;
|
|
}
|
|
|
|
if (!device_property_read_u32(dev, "touch-timeout-ms", &dt_value)) {
|
|
if (dt_value > 2550) {
|
|
dev_err(dev, "touch-timeout-ms (%u) must be [0-2550]\n",
|
|
dt_value);
|
|
return -EINVAL;
|
|
}
|
|
/* Register value is expressed in 0.01s / bit */
|
|
ts->tch_tmout = dt_value / 10;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,
|
|
struct device *dev, int irq, size_t xfer_buf_size)
|
|
{
|
|
struct cyttsp *ts;
|
|
struct input_dev *input_dev;
|
|
int error;
|
|
|
|
ts = devm_kzalloc(dev, sizeof(*ts) + xfer_buf_size, GFP_KERNEL);
|
|
if (!ts)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
input_dev = devm_input_allocate_device(dev);
|
|
if (!input_dev)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ts->dev = dev;
|
|
ts->input = input_dev;
|
|
ts->bus_ops = bus_ops;
|
|
ts->irq = irq;
|
|
|
|
ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
|
|
if (IS_ERR(ts->reset_gpio)) {
|
|
error = PTR_ERR(ts->reset_gpio);
|
|
dev_err(dev, "Failed to request reset gpio, error %d\n", error);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
error = cyttsp_parse_properties(ts);
|
|
if (error)
|
|
return ERR_PTR(error);
|
|
|
|
init_completion(&ts->bl_ready);
|
|
snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
|
|
|
|
input_dev->name = "Cypress TTSP TouchScreen";
|
|
input_dev->phys = ts->phys;
|
|
input_dev->id.bustype = bus_ops->bustype;
|
|
input_dev->dev.parent = ts->dev;
|
|
|
|
input_dev->open = cyttsp_open;
|
|
input_dev->close = cyttsp_close;
|
|
|
|
input_set_drvdata(input_dev, ts);
|
|
|
|
input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
|
|
input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
|
|
touchscreen_parse_properties(input_dev, true, NULL);
|
|
|
|
error = input_mt_init_slots(input_dev, CY_MAX_ID, 0);
|
|
if (error) {
|
|
dev_err(dev, "Unable to init MT slots.\n");
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
error = devm_request_threaded_irq(dev, ts->irq, NULL, cyttsp_irq,
|
|
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
|
"cyttsp", ts);
|
|
if (error) {
|
|
dev_err(ts->dev, "failed to request IRQ %d, err: %d\n",
|
|
ts->irq, error);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
disable_irq(ts->irq);
|
|
|
|
cyttsp_hard_reset(ts);
|
|
|
|
error = cyttsp_power_on(ts);
|
|
if (error)
|
|
return ERR_PTR(error);
|
|
|
|
error = input_register_device(input_dev);
|
|
if (error) {
|
|
dev_err(ts->dev, "failed to register input device: %d\n",
|
|
error);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
return ts;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cyttsp_probe);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard touchscreen driver core");
|
|
MODULE_AUTHOR("Cypress");
|