5f60d5f6bb
asm/unaligned.h is always an include of asm-generic/unaligned.h; might as well move that thing to linux/unaligned.h and include that - there's nothing arch-specific in that header. auto-generated by the following: for i in `git grep -l -w asm/unaligned.h`; do sed -i -e "s/asm\/unaligned.h/linux\/unaligned.h/" $i done for i in `git grep -l -w asm-generic/unaligned.h`; do sed -i -e "s/asm-generic\/unaligned.h/linux\/unaligned.h/" $i done git mv include/asm-generic/unaligned.h include/linux/unaligned.h git mv tools/include/asm-generic/unaligned.h tools/include/linux/unaligned.h sed -i -e "/unaligned.h/d" include/asm-generic/Kbuild sed -i -e "s/__ASM_GENERIC/__LINUX/" include/linux/unaligned.h tools/include/linux/unaligned.h
257 lines
5.7 KiB
C
257 lines
5.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2016, Jelle van der Waa <jelle@vdwaa.nl>
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*/
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#include <linux/delay.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/interrupt.h>
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#include <linux/module.h>
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#include <linux/regulator/consumer.h>
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#include <linux/unaligned.h>
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#define ZET6223_MAX_FINGERS 16
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#define ZET6223_MAX_PKT_SIZE (3 + 4 * ZET6223_MAX_FINGERS)
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#define ZET6223_CMD_INFO 0xB2
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#define ZET6223_CMD_INFO_LENGTH 17
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#define ZET6223_VALID_PACKET 0x3c
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#define ZET6223_POWER_ON_DELAY_MSEC 30
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struct zet6223_ts {
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struct i2c_client *client;
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struct input_dev *input;
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struct touchscreen_properties prop;
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struct regulator_bulk_data supplies[2];
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u16 max_x;
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u16 max_y;
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u8 fingernum;
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};
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static int zet6223_start(struct input_dev *dev)
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{
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struct zet6223_ts *ts = input_get_drvdata(dev);
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enable_irq(ts->client->irq);
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return 0;
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}
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static void zet6223_stop(struct input_dev *dev)
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{
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struct zet6223_ts *ts = input_get_drvdata(dev);
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disable_irq(ts->client->irq);
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}
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static irqreturn_t zet6223_irq(int irq, void *dev_id)
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{
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struct zet6223_ts *ts = dev_id;
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u16 finger_bits;
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/*
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* First 3 bytes are an identifier, two bytes of finger data.
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* X, Y data per finger is 4 bytes.
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*/
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u8 bufsize = 3 + 4 * ts->fingernum;
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u8 buf[ZET6223_MAX_PKT_SIZE];
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int i;
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int ret;
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int error;
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ret = i2c_master_recv(ts->client, buf, bufsize);
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if (ret != bufsize) {
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error = ret < 0 ? ret : -EIO;
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dev_err_ratelimited(&ts->client->dev,
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"Error reading input data: %d\n", error);
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return IRQ_HANDLED;
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}
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if (buf[0] != ZET6223_VALID_PACKET)
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return IRQ_HANDLED;
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finger_bits = get_unaligned_be16(buf + 1);
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for (i = 0; i < ts->fingernum; i++) {
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if (!(finger_bits & BIT(15 - i)))
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continue;
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input_mt_slot(ts->input, i);
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input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true);
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input_event(ts->input, EV_ABS, ABS_MT_POSITION_X,
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((buf[i + 3] >> 4) << 8) + buf[i + 4]);
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input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y,
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((buf[i + 3] & 0xF) << 8) + buf[i + 5]);
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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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return IRQ_HANDLED;
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}
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static void zet6223_power_off(void *_ts)
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{
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struct zet6223_ts *ts = _ts;
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regulator_bulk_disable(ARRAY_SIZE(ts->supplies), ts->supplies);
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}
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static int zet6223_power_on(struct zet6223_ts *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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ts->supplies[0].supply = "vio";
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ts->supplies[1].supply = "vcc";
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error = devm_regulator_bulk_get(dev, ARRAY_SIZE(ts->supplies),
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ts->supplies);
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if (error)
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return error;
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error = regulator_bulk_enable(ARRAY_SIZE(ts->supplies), ts->supplies);
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if (error)
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return error;
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msleep(ZET6223_POWER_ON_DELAY_MSEC);
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error = devm_add_action_or_reset(dev, zet6223_power_off, ts);
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if (error) {
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dev_err(dev, "failed to install poweroff action: %d\n", 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 zet6223_query_device(struct zet6223_ts *ts)
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{
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u8 buf[ZET6223_CMD_INFO_LENGTH];
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u8 cmd = ZET6223_CMD_INFO;
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int ret;
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int error;
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ret = i2c_master_send(ts->client, &cmd, sizeof(cmd));
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if (ret != sizeof(cmd)) {
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error = ret < 0 ? ret : -EIO;
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dev_err(&ts->client->dev,
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"touchpanel info cmd failed: %d\n", error);
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return error;
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}
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ret = i2c_master_recv(ts->client, buf, sizeof(buf));
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if (ret != sizeof(buf)) {
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error = ret < 0 ? ret : -EIO;
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dev_err(&ts->client->dev,
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"failed to retrieve touchpanel info: %d\n", error);
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return error;
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}
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ts->fingernum = buf[15] & 0x7F;
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if (ts->fingernum > ZET6223_MAX_FINGERS) {
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dev_warn(&ts->client->dev,
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"touchpanel reports %d fingers, limiting to %d\n",
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ts->fingernum, ZET6223_MAX_FINGERS);
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ts->fingernum = ZET6223_MAX_FINGERS;
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}
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ts->max_x = get_unaligned_le16(&buf[8]);
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ts->max_y = get_unaligned_le16(&buf[10]);
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return 0;
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}
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static int zet6223_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct zet6223_ts *ts;
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struct input_dev *input;
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int error;
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if (!client->irq) {
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dev_err(dev, "no irq specified\n");
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return -EINVAL;
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}
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ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
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if (!ts)
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return -ENOMEM;
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ts->client = client;
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error = zet6223_power_on(ts);
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if (error)
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return error;
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error = zet6223_query_device(ts);
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if (error)
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return error;
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ts->input = input = devm_input_allocate_device(dev);
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if (!input)
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return -ENOMEM;
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input_set_drvdata(input, ts);
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input->name = client->name;
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input->id.bustype = BUS_I2C;
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input->open = zet6223_start;
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input->close = zet6223_stop;
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input_set_abs_params(input, ABS_MT_POSITION_X, 0, ts->max_x, 0, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0);
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touchscreen_parse_properties(input, true, &ts->prop);
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error = input_mt_init_slots(input, ts->fingernum,
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INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
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if (error)
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return error;
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error = devm_request_threaded_irq(dev, client->irq, NULL, zet6223_irq,
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IRQF_ONESHOT, client->name, ts);
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if (error) {
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dev_err(dev, "failed to request irq %d: %d\n",
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client->irq, error);
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return error;
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}
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zet6223_stop(input);
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error = input_register_device(input);
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if (error)
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return error;
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return 0;
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}
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static const struct of_device_id zet6223_of_match[] = {
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{ .compatible = "zeitec,zet6223" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, zet6223_of_match);
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static const struct i2c_device_id zet6223_id[] = {
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{ "zet6223" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, zet6223_id);
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static struct i2c_driver zet6223_driver = {
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.driver = {
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.name = "zet6223",
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.of_match_table = zet6223_of_match,
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},
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.probe = zet6223_probe,
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.id_table = zet6223_id
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};
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module_i2c_driver(zet6223_driver);
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MODULE_AUTHOR("Jelle van der Waa <jelle@vdwaa.nl>");
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MODULE_DESCRIPTION("ZEITEC zet622x I2C touchscreen driver");
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MODULE_LICENSE("GPL");
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