// SPDX-License-Identifier: GPL-2.0-only/* * drivers/input/touchscreen/tsc2007.c * * Copyright (c) 2008 MtekVision Co., Ltd. * Kwangwoo Lee <kwlee@mtekvision.com> * * Using code from: * - ads7846.c * Copyright (c) 2005 David Brownell * Copyright (c) 2006 Nokia Corporation * - corgi_ts.c * Copyright (C) 2004-2005 Richard Purdie * - omap_ts.[hc], ads7846.h, ts_osk.c * Copyright (C) 2002 MontaVista Software * Copyright (C) 2004 Texas Instruments * Copyright (C) 2005 Dirk Behme */ #include <linux/module.h>#include <linux/slab.h>#include <linux/gpio/consumer.h>#include <linux/input.h>#include <linux/interrupt.h>#include <linux/i2c.h>#include <linux/math64.h>#include <linux/property.h>#include <linux/platform_data/tsc2007.h>#include "tsc2007.h" int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd){ s32 data; u16 val; data = i2c_smbus_read_word_data(tsc->client, cmd); if (data < 0) { dev_err(&tsc->client->dev, "i2c io error: %d\n", data); return data; } /* The protocol and raw data format from i2c interface: * S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P * Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 | Dummy 4bit]. */ val = swab16(data) >> 4; dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val); return val;} static void tsc2007_read_values(struct tsc2007 *tsc, struct ts_event *tc){ /* y- still on; turn on only y+ (and ADC) */ tc->y = tsc2007_xfer(tsc, READ_Y); /* turn y- off, x+ on, then leave in lowpower */ tc->x = tsc2007_xfer(tsc, READ_X); /* turn y+ off, x- on; we'll use formula #1 */ tc->z1 = tsc2007_xfer(tsc, READ_Z1); /* Read Z2 and power down ADC after A/D conversion, enable PENIRQ */ tc->z2 = tsc2007_xfer(tsc, (TSC2007_POWER_OFF_IRQ_EN | TSC2007_MEASURE_Z2));} u32 tsc2007_calculate_resistance(struct tsc2007 *tsc, struct ts_event *tc){ u64 rt = 0; /* range filtering */ if (tc->x == MAX_12BIT) tc->x = 0; if (likely(tc->x && tc->z1)) { /* compute touch resistance using equation #1 */ rt = tc->z2 - tc->z1; rt *= tc->x; rt *= tsc->x_plate_ohms; rt = div_u64(rt, tc->z1); rt = (rt + 2047) >> 12; } if (rt > U32_MAX) return U32_MAX; return (u32) rt;} bool tsc2007_is_pen_down(struct tsc2007 *ts){ /* * NOTE: We can't rely on the pressure to determine the pen down * state, even though this controller has a pressure sensor. * The pressure value can fluctuate for quite a while after * lifting the pen and in some cases may not even settle at the * expected value. * * The only safe way to check for the pen up condition is in the * work function by reading the pen signal state (it's a GPIO * and IRQ). Unfortunately such callback is not always available, * in that case we assume that the pen is down and expect caller * to fall back on the pressure reading. */ if (!ts->get_pendown_state) return true; return ts->get_pendown_state(&ts->client->dev);} static irqreturn_t tsc2007_soft_irq(int irq, void *handle){ struct tsc2007 *ts = handle; struct input_dev *input = ts->input; struct ts_event tc; u32 rt; while (!ts->stopped && tsc2007_is_pen_down(ts)) { /* pen is down, continue with the measurement */ /* Serialize access between the ISR and IIO reads. */ scoped_guard(mutex, &ts->mlock) { tsc2007_read_values(ts, &tc); } rt = tsc2007_calculate_resistance(ts, &tc); if (!rt && !ts->get_pendown_state) { /* * If pressure reported is 0 and we don't have * callback to check pendown state, we have to * assume that pen was lifted up. */ break; } if (rt <= ts->max_rt) { dev_dbg(&ts->client->dev, "DOWN point(%4d,%4d), resistance (%4u)\n", tc.x, tc.y, rt); rt = ts->max_rt - rt; input_report_key(input, BTN_TOUCH, 1); touchscreen_report_pos(input, &ts->prop, tc.x, tc.y, false); input_report_abs(input, ABS_PRESSURE, rt); input_sync(input); } else { /* * Sample found inconsistent by debouncing or pressure is * beyond the maximum. Don't report it to user space, * repeat at least once more the measurement. */ dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt); } wait_event_timeout(ts->wait, ts->stopped, ts->poll_period); } dev_dbg(&ts->client->dev, "UP\n"); input_report_key(input, BTN_TOUCH, 0); input_report_abs(input, ABS_PRESSURE, 0); input_sync(input); if (ts->clear_penirq) ts->clear_penirq(); return IRQ_HANDLED;} static void tsc2007_stop(struct tsc2007 *ts){ ts->stopped = true; mb(); wake_up(&ts->wait); if (ts->irq) disable_irq(ts->irq);} static int tsc2007_open(struct input_dev *input_dev){ struct tsc2007 *ts = input_get_drvdata(input_dev); int err; ts->stopped = false; mb(); if (ts->irq) enable_irq(ts->irq); /* Prepare for touch readings - power down ADC and enable PENIRQ */ err = tsc2007_xfer(ts, PWRDOWN); if (err < 0) { tsc2007_stop(ts); return err; } return 0;} static void tsc2007_close(struct input_dev *input_dev){ struct tsc2007 *ts = input_get_drvdata(input_dev); tsc2007_stop(ts);} static int tsc2007_get_pendown_state_gpio(struct device *dev){ struct i2c_client *client = to_i2c_client(dev); struct tsc2007 *ts = i2c_get_clientdata(client); return gpiod_get_value_cansleep(ts->gpiod);} static int tsc2007_probe_properties(struct device *dev, struct tsc2007 *ts){ u32 val32; u64 val64; if (!device_property_read_u32(dev, "ti,max-rt", &val32)) ts->max_rt = val32; else ts->max_rt = MAX_12BIT; if (!device_property_read_u32(dev, "ti,fuzzx", &val32)) ts->fuzzx = val32; if (!device_property_read_u32(dev, "ti,fuzzy", &val32)) ts->fuzzy = val32; if (!device_property_read_u32(dev, "ti,fuzzz", &val32)) ts->fuzzz = val32; if (!device_property_read_u64(dev, "ti,poll-period", &val64)) ts->poll_period = msecs_to_jiffies(val64); else ts->poll_period = msecs_to_jiffies(1); if (!device_property_read_u32(dev, "ti,x-plate-ohms", &val32)) { ts->x_plate_ohms = val32; } else { dev_err(dev, "Missing ti,x-plate-ohms device property\n"); return -EINVAL; } ts->gpiod = devm_gpiod_get_optional(dev, NULL, GPIOD_IN); if (IS_ERR(ts->gpiod)) return PTR_ERR(ts->gpiod); if (ts->gpiod) ts->get_pendown_state = tsc2007_get_pendown_state_gpio; else dev_dbg(dev, "Pen down GPIO is not specified in properties\n"); return 0;} static int tsc2007_probe_pdev(struct device *dev, struct tsc2007 *ts, const struct tsc2007_platform_data *pdata, const struct i2c_device_id *id){ ts->model = pdata->model; ts->x_plate_ohms = pdata->x_plate_ohms; ts->max_rt = pdata->max_rt ? : MAX_12BIT; ts->poll_period = msecs_to_jiffies(pdata->poll_period ? : 1); ts->get_pendown_state = pdata->get_pendown_state; ts->clear_penirq = pdata->clear_penirq; ts->fuzzx = pdata->fuzzx; ts->fuzzy = pdata->fuzzy; ts->fuzzz = pdata->fuzzz; if (pdata->x_plate_ohms == 0) { dev_err(dev, "x_plate_ohms is not set up in platform data\n"); return -EINVAL; } return 0;} static void tsc2007_call_exit_platform_hw(void *data){ struct device *dev = data; const struct tsc2007_platform_data *pdata = dev_get_platdata(dev); pdata->exit_platform_hw();} static int tsc2007_probe(struct i2c_client *client){ const struct i2c_device_id *id = i2c_client_get_device_id(client); const struct tsc2007_platform_data *pdata = dev_get_platdata(&client->dev); struct tsc2007 *ts; struct input_dev *input_dev; int err; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_WORD_DATA)) return -EIO; ts = devm_kzalloc(&client->dev, sizeof(struct tsc2007), GFP_KERNEL); if (!ts) return -ENOMEM; if (pdata) err = tsc2007_probe_pdev(&client->dev, ts, pdata, id); else err = tsc2007_probe_properties(&client->dev, ts); if (err) return err; input_dev = devm_input_allocate_device(&client->dev); if (!input_dev) return -ENOMEM; i2c_set_clientdata(client, ts); ts->client = client; ts->irq = client->irq; ts->input = input_dev; init_waitqueue_head(&ts->wait); mutex_init(&ts->mlock); snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&client->dev)); input_dev->name = "TSC2007 Touchscreen"; input_dev->phys = ts->phys; input_dev->id.bustype = BUS_I2C; input_dev->open = tsc2007_open; input_dev->close = tsc2007_close; input_set_drvdata(input_dev, ts); input_set_capability(input_dev, EV_KEY, BTN_TOUCH); input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, ts->fuzzx, 0); input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, ts->fuzzy, 0); touchscreen_parse_properties(input_dev, false, &ts->prop); input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, ts->fuzzz, 0); if (pdata) { if (pdata->exit_platform_hw) { err = devm_add_action(&client->dev, tsc2007_call_exit_platform_hw, &client->dev); if (err) { dev_err(&client->dev, "Failed to register exit_platform_hw action, %d\n", err); return err; } } if (pdata->init_platform_hw) pdata->init_platform_hw(); } if (ts->irq) { err = devm_request_threaded_irq(&client->dev, ts->irq, NULL, tsc2007_soft_irq, IRQF_ONESHOT, client->dev.driver->name, ts); if (err) { dev_err(&client->dev, "Failed to request irq %d: %d\n", ts->irq, err); return err; } tsc2007_stop(ts); } /* power down the chip (TSC2007_SETUP does not ACK on I2C) */ err = tsc2007_xfer(ts, PWRDOWN); if (err < 0) { dev_err(&client->dev, "Failed to setup chip: %d\n", err); return err; /* chip does not respond */ } err = input_register_device(input_dev); if (err) { dev_err(&client->dev, "Failed to register input device: %d\n", err); return err; } err = tsc2007_iio_configure(ts); if (err) { dev_err(&client->dev, "Failed to register with IIO: %d\n", err); return err; } return 0;} static const struct i2c_device_id tsc2007_idtable[] = { { .name = "tsc2007" }, { }}; MODULE_DEVICE_TABLE(i2c, tsc2007_idtable); static const struct of_device_id tsc2007_of_match[] = { { .compatible = "ti,tsc2007" }, { /* sentinel */ }};MODULE_DEVICE_TABLE(of, tsc2007_of_match); static struct i2c_driver tsc2007_driver = { .driver = { .name = "tsc2007", .of_match_table = tsc2007_of_match, }, .id_table = tsc2007_idtable, .probe = tsc2007_probe,}; module_i2c_driver(tsc2007_driver); MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>");MODULE_DESCRIPTION("TSC2007 TouchScreen Driver");MODULE_LICENSE("GPL");
// SPDX-License-Identifier: GPL-2.0-only
/*
* drivers/input/touchscreen/tsc2007.c
*
* Copyright (c) 2008 MtekVision Co., Ltd.
* Kwangwoo Lee <kwlee@mtekvision.com>
*
* Using code from:
* - ads7846.c
* Copyright (c) 2005 David Brownell
* Copyright (c) 2006 Nokia Corporation
* - corgi_ts.c
* Copyright (C) 2004-2005 Richard Purdie
* - omap_ts.[hc], ads7846.h, ts_osk.c
* Copyright (C) 2002 MontaVista Software
* Copyright (C) 2004 Texas Instruments
* Copyright (C) 2005 Dirk Behme
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/math64.h>
#include <linux/property.h>
#include <linux/platform_data/tsc2007.h>
#include "tsc2007.h"
int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
{
s32 data;
u16 val;
data = i2c_smbus_read_word_data(tsc->client, cmd);
if (data < 0) {
dev_err(&tsc->client->dev, "i2c io error: %d\n", data);
return data;
}
/* The protocol and raw data format from i2c interface:
* S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P
* Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 | Dummy 4bit].
*/
val = swab16(data) >> 4;
dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val);
return val;
}
static void tsc2007_read_values(struct tsc2007 *tsc, struct ts_event *tc)
{
/* y- still on; turn on only y+ (and ADC) */
tc->y = tsc2007_xfer(tsc, READ_Y);
/* turn y- off, x+ on, then leave in lowpower */
tc->x = tsc2007_xfer(tsc, READ_X);
/* turn y+ off, x- on; we'll use formula #1 */
tc->z1 = tsc2007_xfer(tsc, READ_Z1);
/* Read Z2 and power down ADC after A/D conversion, enable PENIRQ */
tc->z2 = tsc2007_xfer(tsc, (TSC2007_POWER_OFF_IRQ_EN | TSC2007_MEASURE_Z2));
}
u32 tsc2007_calculate_resistance(struct tsc2007 *tsc, struct ts_event *tc)
{
u64 rt = 0;
/* range filtering */
if (tc->x == MAX_12BIT)
tc->x = 0;
if (likely(tc->x && tc->z1)) {
/* compute touch resistance using equation #1 */
rt = tc->z2 - tc->z1;
rt *= tc->x;
rt *= tsc->x_plate_ohms;
rt = div_u64(rt, tc->z1);
rt = (rt + 2047) >> 12;
}
if (rt > U32_MAX)
return U32_MAX;
return (u32) rt;
}
bool tsc2007_is_pen_down(struct tsc2007 *ts)
{
/*
* NOTE: We can't rely on the pressure to determine the pen down
* state, even though this controller has a pressure sensor.
* The pressure value can fluctuate for quite a while after
* lifting the pen and in some cases may not even settle at the
* expected value.
*
* The only safe way to check for the pen up condition is in the
* work function by reading the pen signal state (it's a GPIO
* and IRQ). Unfortunately such callback is not always available,
* in that case we assume that the pen is down and expect caller
* to fall back on the pressure reading.
*/
if (!ts->get_pendown_state)
return true;
return ts->get_pendown_state(&ts->client->dev);
}
static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
{
struct tsc2007 *ts = handle;
struct input_dev *input = ts->input;
struct ts_event tc;
u32 rt;
while (!ts->stopped && tsc2007_is_pen_down(ts)) {
/* pen is down, continue with the measurement */
/* Serialize access between the ISR and IIO reads. */
scoped_guard(mutex, &ts->mlock) {
tsc2007_read_values(ts, &tc);
}
rt = tsc2007_calculate_resistance(ts, &tc);
if (!rt && !ts->get_pendown_state) {
/*
* If pressure reported is 0 and we don't have
* callback to check pendown state, we have to
* assume that pen was lifted up.
*/
break;
}
if (rt <= ts->max_rt) {
dev_dbg(&ts->client->dev,
"DOWN point(%4d,%4d), resistance (%4u)\n",
tc.x, tc.y, rt);
rt = ts->max_rt - rt;
input_report_key(input, BTN_TOUCH, 1);
touchscreen_report_pos(input, &ts->prop, tc.x, tc.y, false);
input_report_abs(input, ABS_PRESSURE, rt);
input_sync(input);
} else {
/*
* Sample found inconsistent by debouncing or pressure is
* beyond the maximum. Don't report it to user space,
* repeat at least once more the measurement.
*/
dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);
}
wait_event_timeout(ts->wait, ts->stopped, ts->poll_period);
}
dev_dbg(&ts->client->dev, "UP\n");
input_report_key(input, BTN_TOUCH, 0);
input_report_abs(input, ABS_PRESSURE, 0);
input_sync(input);
if (ts->clear_penirq)
ts->clear_penirq();
return IRQ_HANDLED;
}
static void tsc2007_stop(struct tsc2007 *ts)
{
ts->stopped = true;
mb();
wake_up(&ts->wait);
if (ts->irq)
disable_irq(ts->irq);
}
static int tsc2007_open(struct input_dev *input_dev)
{
struct tsc2007 *ts = input_get_drvdata(input_dev);
int err;
ts->stopped = false;
mb();
if (ts->irq)
enable_irq(ts->irq);
/* Prepare for touch readings - power down ADC and enable PENIRQ */
err = tsc2007_xfer(ts, PWRDOWN);
if (err < 0) {
tsc2007_stop(ts);
return err;
}
return 0;
}
static void tsc2007_close(struct input_dev *input_dev)
{
struct tsc2007 *ts = input_get_drvdata(input_dev);
tsc2007_stop(ts);
}
static int tsc2007_get_pendown_state_gpio(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct tsc2007 *ts = i2c_get_clientdata(client);
return gpiod_get_value_cansleep(ts->gpiod);
}
static int tsc2007_probe_properties(struct device *dev, struct tsc2007 *ts)
{
u32 val32;
u64 val64;
if (!device_property_read_u32(dev, "ti,max-rt", &val32))
ts->max_rt = val32;
else
ts->max_rt = MAX_12BIT;
if (!device_property_read_u32(dev, "ti,fuzzx", &val32))
ts->fuzzx = val32;
if (!device_property_read_u32(dev, "ti,fuzzy", &val32))
ts->fuzzy = val32;
if (!device_property_read_u32(dev, "ti,fuzzz", &val32))
ts->fuzzz = val32;
if (!device_property_read_u64(dev, "ti,poll-period", &val64))
ts->poll_period = msecs_to_jiffies(val64);
else
ts->poll_period = msecs_to_jiffies(1);
if (!device_property_read_u32(dev, "ti,x-plate-ohms", &val32)) {
ts->x_plate_ohms = val32;
} else {
dev_err(dev, "Missing ti,x-plate-ohms device property\n");
return -EINVAL;
}
ts->gpiod = devm_gpiod_get_optional(dev, NULL, GPIOD_IN);
if (IS_ERR(ts->gpiod))
return PTR_ERR(ts->gpiod);
if (ts->gpiod)
ts->get_pendown_state = tsc2007_get_pendown_state_gpio;
else
dev_dbg(dev, "Pen down GPIO is not specified in properties\n");
return 0;
}
static int tsc2007_probe_pdev(struct device *dev, struct tsc2007 *ts,
const struct tsc2007_platform_data *pdata,
const struct i2c_device_id *id)
{
ts->model = pdata->model;
ts->x_plate_ohms = pdata->x_plate_ohms;
ts->max_rt = pdata->max_rt ? : MAX_12BIT;
ts->poll_period = msecs_to_jiffies(pdata->poll_period ? : 1);
ts->get_pendown_state = pdata->get_pendown_state;
ts->clear_penirq = pdata->clear_penirq;
ts->fuzzx = pdata->fuzzx;
ts->fuzzy = pdata->fuzzy;
ts->fuzzz = pdata->fuzzz;
if (pdata->x_plate_ohms == 0) {
dev_err(dev, "x_plate_ohms is not set up in platform data\n");
return -EINVAL;
}
return 0;
}
static void tsc2007_call_exit_platform_hw(void *data)
{
struct device *dev = data;
const struct tsc2007_platform_data *pdata = dev_get_platdata(dev);
pdata->exit_platform_hw();
}
static int tsc2007_probe(struct i2c_client *client)
{
const struct i2c_device_id *id = i2c_client_get_device_id(client);
const struct tsc2007_platform_data *pdata =
dev_get_platdata(&client->dev);
struct tsc2007 *ts;
struct input_dev *input_dev;
int err;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_WORD_DATA))
return -EIO;
ts = devm_kzalloc(&client->dev, sizeof(struct tsc2007), GFP_KERNEL);
if (!ts)
return -ENOMEM;
if (pdata)
err = tsc2007_probe_pdev(&client->dev, ts, pdata, id);
else
err = tsc2007_probe_properties(&client->dev, ts);
if (err)
return err;
input_dev = devm_input_allocate_device(&client->dev);
if (!input_dev)
return -ENOMEM;
i2c_set_clientdata(client, ts);
ts->client = client;
ts->irq = client->irq;
ts->input = input_dev;
init_waitqueue_head(&ts->wait);
mutex_init(&ts->mlock);
snprintf(ts->phys, sizeof(ts->phys),
"%s/input0", dev_name(&client->dev));
input_dev->name = "TSC2007 Touchscreen";
input_dev->phys = ts->phys;
input_dev->id.bustype = BUS_I2C;
input_dev->open = tsc2007_open;
input_dev->close = tsc2007_close;
input_set_drvdata(input_dev, ts);
input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, ts->fuzzx, 0);
input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, ts->fuzzy, 0);
touchscreen_parse_properties(input_dev, false, &ts->prop);
input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT,
ts->fuzzz, 0);
if (pdata) {
if (pdata->exit_platform_hw) {
err = devm_add_action(&client->dev,
tsc2007_call_exit_platform_hw,
&client->dev);
if (err) {
dev_err(&client->dev,
"Failed to register exit_platform_hw action, %d\n",
err);
return err;
}
}
if (pdata->init_platform_hw)
pdata->init_platform_hw();
}
if (ts->irq) {
err = devm_request_threaded_irq(&client->dev, ts->irq,
NULL, tsc2007_soft_irq,
IRQF_ONESHOT,
client->dev.driver->name, ts);
if (err) {
dev_err(&client->dev, "Failed to request irq %d: %d\n",
ts->irq, err);
return err;
}
tsc2007_stop(ts);
}
/* power down the chip (TSC2007_SETUP does not ACK on I2C) */
err = tsc2007_xfer(ts, PWRDOWN);
if (err < 0) {
dev_err(&client->dev,
"Failed to setup chip: %d\n", err);
return err; /* chip does not respond */
}
err = input_register_device(input_dev);
if (err) {
dev_err(&client->dev,
"Failed to register input device: %d\n", err);
return err;
}
err = tsc2007_iio_configure(ts);
if (err) {
dev_err(&client->dev,
"Failed to register with IIO: %d\n", err);
return err;
}
return 0;
}
static const struct i2c_device_id tsc2007_idtable[] = {
{ .name = "tsc2007" },
{ }
};
MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);
static const struct of_device_id tsc2007_of_match[] = {
{ .compatible = "ti,tsc2007" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, tsc2007_of_match);
static struct i2c_driver tsc2007_driver = {
.driver = {
.name = "tsc2007",
.of_match_table = tsc2007_of_match,
},
.id_table = tsc2007_idtable,
.probe = tsc2007_probe,
};
module_i2c_driver(tsc2007_driver);
MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>");
MODULE_DESCRIPTION("TSC2007 TouchScreen Driver");
MODULE_LICENSE("GPL");