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d7ddf15414
If a function declares a variable to access a structure element, use it consistently. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
626 lines
15 KiB
C
626 lines
15 KiB
C
/*
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* Driver for Pixcir I2C touchscreen controllers.
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*
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* Copyright (C) 2010-2011 Pixcir, Inc.
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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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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/i2c.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/gpio/consumer.h>
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#include <linux/of_device.h>
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#include <linux/platform_data/pixcir_i2c_ts.h>
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#include <asm/unaligned.h>
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#define PIXCIR_MAX_SLOTS 5 /* Max fingers supported by driver */
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struct pixcir_i2c_ts_data {
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struct i2c_client *client;
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struct input_dev *input;
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struct gpio_desc *gpio_attb;
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struct gpio_desc *gpio_reset;
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struct gpio_desc *gpio_enable;
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struct gpio_desc *gpio_wake;
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const struct pixcir_i2c_chip_data *chip;
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struct touchscreen_properties prop;
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int max_fingers; /* Max fingers supported in this instance */
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bool running;
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};
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struct pixcir_report_data {
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int num_touches;
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struct input_mt_pos pos[PIXCIR_MAX_SLOTS];
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int ids[PIXCIR_MAX_SLOTS];
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};
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static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
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struct pixcir_report_data *report)
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{
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u8 rdbuf[2 + PIXCIR_MAX_SLOTS * 5];
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u8 wrbuf[1] = { 0 };
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u8 *bufptr;
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u8 touch;
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int ret, i;
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int readsize;
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const struct pixcir_i2c_chip_data *chip = tsdata->chip;
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memset(report, 0, sizeof(struct pixcir_report_data));
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i = chip->has_hw_ids ? 1 : 0;
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readsize = 2 + tsdata->max_fingers * (4 + i);
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if (readsize > sizeof(rdbuf))
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readsize = sizeof(rdbuf);
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ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
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if (ret != sizeof(wrbuf)) {
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dev_err(&tsdata->client->dev,
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"%s: i2c_master_send failed(), ret=%d\n",
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__func__, ret);
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return;
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}
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ret = i2c_master_recv(tsdata->client, rdbuf, readsize);
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if (ret != readsize) {
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dev_err(&tsdata->client->dev,
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"%s: i2c_master_recv failed(), ret=%d\n",
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__func__, ret);
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return;
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}
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touch = rdbuf[0] & 0x7;
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if (touch > tsdata->max_fingers)
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touch = tsdata->max_fingers;
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report->num_touches = touch;
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bufptr = &rdbuf[2];
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for (i = 0; i < touch; i++) {
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touchscreen_set_mt_pos(&report->pos[i], &tsdata->prop,
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get_unaligned_le16(bufptr),
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get_unaligned_le16(bufptr + 2));
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if (chip->has_hw_ids) {
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report->ids[i] = bufptr[4];
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bufptr = bufptr + 5;
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} else {
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bufptr = bufptr + 4;
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}
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}
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}
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static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
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struct pixcir_report_data *report)
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{
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int slots[PIXCIR_MAX_SLOTS];
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int n, i, slot;
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struct device *dev = &ts->client->dev;
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const struct pixcir_i2c_chip_data *chip = ts->chip;
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n = report->num_touches;
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if (n > PIXCIR_MAX_SLOTS)
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n = PIXCIR_MAX_SLOTS;
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if (!ts->chip->has_hw_ids)
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input_mt_assign_slots(ts->input, slots, report->pos, n, 0);
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for (i = 0; i < n; i++) {
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if (chip->has_hw_ids) {
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slot = input_mt_get_slot_by_key(ts->input,
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report->ids[i]);
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if (slot < 0) {
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dev_dbg(dev, "no free slot for id 0x%x\n",
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report->ids[i]);
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continue;
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}
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} else {
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slot = slots[i];
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}
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input_mt_slot(ts->input, slot);
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input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true);
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input_report_abs(ts->input, ABS_MT_POSITION_X,
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report->pos[i].x);
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input_report_abs(ts->input, ABS_MT_POSITION_Y,
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report->pos[i].y);
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dev_dbg(dev, "%d: slot %d, x %d, y %d\n",
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i, slot, report->pos[i].x, report->pos[i].y);
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}
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input_mt_sync_frame(ts->input);
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input_sync(ts->input);
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}
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static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
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{
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struct pixcir_i2c_ts_data *tsdata = dev_id;
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struct pixcir_report_data report;
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while (tsdata->running) {
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/* parse packet */
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pixcir_ts_parse(tsdata, &report);
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/* report it */
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pixcir_ts_report(tsdata, &report);
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if (gpiod_get_value_cansleep(tsdata->gpio_attb)) {
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if (report.num_touches) {
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/*
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* Last report with no finger up?
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* Do it now then.
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*/
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input_mt_sync_frame(tsdata->input);
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input_sync(tsdata->input);
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}
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break;
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}
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msleep(20);
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}
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return IRQ_HANDLED;
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}
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static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
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{
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if (!IS_ERR_OR_NULL(tsdata->gpio_reset)) {
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gpiod_set_value_cansleep(tsdata->gpio_reset, 1);
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ndelay(100); /* datasheet section 1.2.3 says 80ns min. */
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gpiod_set_value_cansleep(tsdata->gpio_reset, 0);
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/* wait for controller ready. 100ms guess. */
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msleep(100);
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}
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}
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static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
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enum pixcir_power_mode mode)
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{
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struct device *dev = &ts->client->dev;
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int ret;
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if (mode == PIXCIR_POWER_ACTIVE || mode == PIXCIR_POWER_IDLE) {
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if (ts->gpio_wake)
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gpiod_set_value_cansleep(ts->gpio_wake, 1);
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}
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ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
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if (ret < 0) {
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dev_err(dev, "%s: can't read reg 0x%x : %d\n",
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__func__, PIXCIR_REG_POWER_MODE, ret);
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return ret;
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}
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ret &= ~PIXCIR_POWER_MODE_MASK;
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ret |= mode;
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/* Always AUTO_IDLE */
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ret |= PIXCIR_POWER_ALLOW_IDLE;
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ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_POWER_MODE, ret);
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if (ret < 0) {
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dev_err(dev, "%s: can't write reg 0x%x : %d\n",
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__func__, PIXCIR_REG_POWER_MODE, ret);
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return ret;
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}
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if (mode == PIXCIR_POWER_HALT) {
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if (ts->gpio_wake)
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gpiod_set_value_cansleep(ts->gpio_wake, 0);
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}
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return 0;
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}
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/*
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* Set the interrupt mode for the device i.e. ATTB line behaviour
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*
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* @polarity : 1 for active high, 0 for active low.
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*/
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static int pixcir_set_int_mode(struct pixcir_i2c_ts_data *ts,
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enum pixcir_int_mode mode, bool polarity)
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{
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struct device *dev = &ts->client->dev;
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int ret;
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ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
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if (ret < 0) {
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dev_err(dev, "%s: can't read reg 0x%x : %d\n",
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__func__, PIXCIR_REG_INT_MODE, ret);
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return ret;
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}
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ret &= ~PIXCIR_INT_MODE_MASK;
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ret |= mode;
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if (polarity)
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ret |= PIXCIR_INT_POL_HIGH;
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else
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ret &= ~PIXCIR_INT_POL_HIGH;
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ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
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if (ret < 0) {
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dev_err(dev, "%s: can't write reg 0x%x : %d\n",
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__func__, PIXCIR_REG_INT_MODE, ret);
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return ret;
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}
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return 0;
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}
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/*
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* Enable/disable interrupt generation
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*/
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static int pixcir_int_enable(struct pixcir_i2c_ts_data *ts, bool enable)
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{
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struct device *dev = &ts->client->dev;
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int ret;
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ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
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if (ret < 0) {
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dev_err(dev, "%s: can't read reg 0x%x : %d\n",
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__func__, PIXCIR_REG_INT_MODE, ret);
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return ret;
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}
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if (enable)
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ret |= PIXCIR_INT_ENABLE;
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else
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ret &= ~PIXCIR_INT_ENABLE;
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ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
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if (ret < 0) {
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dev_err(dev, "%s: can't write reg 0x%x : %d\n",
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__func__, PIXCIR_REG_INT_MODE, ret);
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return ret;
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}
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return 0;
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}
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static int pixcir_start(struct pixcir_i2c_ts_data *ts)
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{
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struct device *dev = &ts->client->dev;
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int error;
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if (ts->gpio_enable) {
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gpiod_set_value_cansleep(ts->gpio_enable, 1);
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msleep(100);
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}
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/* LEVEL_TOUCH interrupt with active low polarity */
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error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
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if (error) {
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dev_err(dev, "Failed to set interrupt mode: %d\n", error);
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return error;
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}
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ts->running = true;
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mb(); /* Update status before IRQ can fire */
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/* enable interrupt generation */
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error = pixcir_int_enable(ts, true);
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if (error) {
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dev_err(dev, "Failed to enable interrupt generation: %d\n",
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error);
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return error;
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}
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return 0;
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}
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static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
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{
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int error;
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/* Disable interrupt generation */
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error = pixcir_int_enable(ts, false);
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if (error) {
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dev_err(&ts->client->dev,
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"Failed to disable interrupt generation: %d\n",
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error);
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return error;
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}
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/* Exit ISR if running, no more report parsing */
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ts->running = false;
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mb(); /* update status before we synchronize irq */
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/* Wait till running ISR is complete */
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synchronize_irq(ts->client->irq);
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if (ts->gpio_enable)
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gpiod_set_value_cansleep(ts->gpio_enable, 0);
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return 0;
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}
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static int pixcir_input_open(struct input_dev *dev)
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{
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struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
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return pixcir_start(ts);
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}
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static void pixcir_input_close(struct input_dev *dev)
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{
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struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
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pixcir_stop(ts);
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}
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static int __maybe_unused pixcir_i2c_ts_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
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struct input_dev *input = ts->input;
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int ret = 0;
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mutex_lock(&input->mutex);
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if (device_may_wakeup(&client->dev)) {
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if (!input->users) {
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ret = pixcir_start(ts);
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if (ret) {
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dev_err(dev, "Failed to start\n");
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goto unlock;
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}
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}
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} else if (input->users) {
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ret = pixcir_stop(ts);
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}
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unlock:
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mutex_unlock(&input->mutex);
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return ret;
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}
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static int __maybe_unused pixcir_i2c_ts_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
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struct input_dev *input = ts->input;
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int ret = 0;
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mutex_lock(&input->mutex);
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if (device_may_wakeup(&client->dev)) {
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if (!input->users) {
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ret = pixcir_stop(ts);
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if (ret) {
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dev_err(dev, "Failed to stop\n");
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goto unlock;
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}
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}
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} else if (input->users) {
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ret = pixcir_start(ts);
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}
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unlock:
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mutex_unlock(&input->mutex);
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return ret;
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}
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static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
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pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
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#ifdef CONFIG_OF
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static const struct of_device_id pixcir_of_match[];
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static int pixcir_parse_dt(struct device *dev,
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struct pixcir_i2c_ts_data *tsdata)
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{
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tsdata->chip = of_device_get_match_data(dev);
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if (!tsdata->chip)
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return -EINVAL;
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return 0;
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}
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#else
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static int pixcir_parse_dt(struct device *dev,
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struct pixcir_i2c_ts_data *tsdata)
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{
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return -EINVAL;
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}
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#endif
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static int pixcir_i2c_ts_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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const struct pixcir_ts_platform_data *pdata =
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dev_get_platdata(&client->dev);
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struct device *dev = &client->dev;
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struct pixcir_i2c_ts_data *tsdata;
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struct input_dev *input;
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int error;
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tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
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if (!tsdata)
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return -ENOMEM;
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if (pdata) {
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tsdata->chip = &pdata->chip;
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} else if (dev->of_node) {
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error = pixcir_parse_dt(dev, tsdata);
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if (error)
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return error;
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} else {
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dev_err(dev, "platform data not defined\n");
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return -EINVAL;
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}
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if (!tsdata->chip->max_fingers) {
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dev_err(dev, "Invalid max_fingers in chip data\n");
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return -EINVAL;
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}
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input = devm_input_allocate_device(dev);
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if (!input) {
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dev_err(dev, "Failed to allocate input device\n");
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return -ENOMEM;
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}
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tsdata->client = client;
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tsdata->input = input;
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input->name = client->name;
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input->id.bustype = BUS_I2C;
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input->open = pixcir_input_open;
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input->close = pixcir_input_close;
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input->dev.parent = dev;
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if (pdata) {
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input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
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} else {
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input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
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input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
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touchscreen_parse_properties(input, true, &tsdata->prop);
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if (!input_abs_get_max(input, ABS_MT_POSITION_X) ||
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!input_abs_get_max(input, ABS_MT_POSITION_Y)) {
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dev_err(dev, "Touchscreen size is not specified\n");
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return -EINVAL;
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}
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}
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tsdata->max_fingers = tsdata->chip->max_fingers;
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if (tsdata->max_fingers > PIXCIR_MAX_SLOTS) {
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tsdata->max_fingers = PIXCIR_MAX_SLOTS;
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dev_info(dev, "Limiting maximum fingers to %d\n",
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tsdata->max_fingers);
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}
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error = input_mt_init_slots(input, tsdata->max_fingers,
|
|
INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
|
|
if (error) {
|
|
dev_err(dev, "Error initializing Multi-Touch slots\n");
|
|
return error;
|
|
}
|
|
|
|
input_set_drvdata(input, tsdata);
|
|
|
|
tsdata->gpio_attb = devm_gpiod_get(dev, "attb", GPIOD_IN);
|
|
if (IS_ERR(tsdata->gpio_attb)) {
|
|
error = PTR_ERR(tsdata->gpio_attb);
|
|
dev_err(dev, "Failed to request ATTB gpio: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
tsdata->gpio_reset = devm_gpiod_get_optional(dev, "reset",
|
|
GPIOD_OUT_LOW);
|
|
if (IS_ERR(tsdata->gpio_reset)) {
|
|
error = PTR_ERR(tsdata->gpio_reset);
|
|
dev_err(dev, "Failed to request RESET gpio: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
tsdata->gpio_wake = devm_gpiod_get_optional(dev, "wake",
|
|
GPIOD_OUT_HIGH);
|
|
if (IS_ERR(tsdata->gpio_wake)) {
|
|
error = PTR_ERR(tsdata->gpio_wake);
|
|
if (error != -EPROBE_DEFER)
|
|
dev_err(dev, "Failed to get wake gpio: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
tsdata->gpio_enable = devm_gpiod_get_optional(dev, "enable",
|
|
GPIOD_OUT_HIGH);
|
|
if (IS_ERR(tsdata->gpio_enable)) {
|
|
error = PTR_ERR(tsdata->gpio_enable);
|
|
if (error != -EPROBE_DEFER)
|
|
dev_err(dev, "Failed to get enable gpio: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
if (tsdata->gpio_enable)
|
|
msleep(100);
|
|
|
|
error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
|
|
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
|
client->name, tsdata);
|
|
if (error) {
|
|
dev_err(dev, "failed to request irq %d\n", client->irq);
|
|
return error;
|
|
}
|
|
|
|
pixcir_reset(tsdata);
|
|
|
|
/* Always be in IDLE mode to save power, device supports auto wake */
|
|
error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
|
|
if (error) {
|
|
dev_err(dev, "Failed to set IDLE mode\n");
|
|
return error;
|
|
}
|
|
|
|
/* Stop device till opened */
|
|
error = pixcir_stop(tsdata);
|
|
if (error)
|
|
return error;
|
|
|
|
error = input_register_device(input);
|
|
if (error)
|
|
return error;
|
|
|
|
i2c_set_clientdata(client, tsdata);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id pixcir_i2c_ts_id[] = {
|
|
{ "pixcir_ts", 0 },
|
|
{ "pixcir_tangoc", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct pixcir_i2c_chip_data pixcir_ts_data = {
|
|
.max_fingers = 2,
|
|
/* no hw id support */
|
|
};
|
|
|
|
static const struct pixcir_i2c_chip_data pixcir_tangoc_data = {
|
|
.max_fingers = 5,
|
|
.has_hw_ids = true,
|
|
};
|
|
|
|
static const struct of_device_id pixcir_of_match[] = {
|
|
{ .compatible = "pixcir,pixcir_ts", .data = &pixcir_ts_data },
|
|
{ .compatible = "pixcir,pixcir_tangoc", .data = &pixcir_tangoc_data },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, pixcir_of_match);
|
|
#endif
|
|
|
|
static struct i2c_driver pixcir_i2c_ts_driver = {
|
|
.driver = {
|
|
.name = "pixcir_ts",
|
|
.pm = &pixcir_dev_pm_ops,
|
|
.of_match_table = of_match_ptr(pixcir_of_match),
|
|
},
|
|
.probe = pixcir_i2c_ts_probe,
|
|
.id_table = pixcir_i2c_ts_id,
|
|
};
|
|
|
|
module_i2c_driver(pixcir_i2c_ts_driver);
|
|
|
|
MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
|
|
MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
|
|
MODULE_LICENSE("GPL");
|