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-rw-r--r--drivers/input/touchscreen/tsc2007.c496
1 files changed, 0 insertions, 496 deletions
diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c
deleted file mode 100644
index 5d0cd51c6f41..000000000000
--- a/drivers/input/touchscreen/tsc2007.c
+++ /dev/null
@@ -1,496 +0,0 @@
-/*
- * 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
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/input.h>
-#include <linux/interrupt.h>
-#include <linux/i2c.h>
-#include <linux/i2c/tsc2007.h>
-#include <linux/of_device.h>
-#include <linux/of.h>
-#include <linux/of_gpio.h>
-
-#define TSC2007_MEASURE_TEMP0 (0x0 << 4)
-#define TSC2007_MEASURE_AUX (0x2 << 4)
-#define TSC2007_MEASURE_TEMP1 (0x4 << 4)
-#define TSC2007_ACTIVATE_XN (0x8 << 4)
-#define TSC2007_ACTIVATE_YN (0x9 << 4)
-#define TSC2007_ACTIVATE_YP_XN (0xa << 4)
-#define TSC2007_SETUP (0xb << 4)
-#define TSC2007_MEASURE_X (0xc << 4)
-#define TSC2007_MEASURE_Y (0xd << 4)
-#define TSC2007_MEASURE_Z1 (0xe << 4)
-#define TSC2007_MEASURE_Z2 (0xf << 4)
-
-#define TSC2007_POWER_OFF_IRQ_EN (0x0 << 2)
-#define TSC2007_ADC_ON_IRQ_DIS0 (0x1 << 2)
-#define TSC2007_ADC_OFF_IRQ_EN (0x2 << 2)
-#define TSC2007_ADC_ON_IRQ_DIS1 (0x3 << 2)
-
-#define TSC2007_12BIT (0x0 << 1)
-#define TSC2007_8BIT (0x1 << 1)
-
-#define MAX_12BIT ((1 << 12) - 1)
-
-#define ADC_ON_12BIT (TSC2007_12BIT | TSC2007_ADC_ON_IRQ_DIS0)
-
-#define READ_Y (ADC_ON_12BIT | TSC2007_MEASURE_Y)
-#define READ_Z1 (ADC_ON_12BIT | TSC2007_MEASURE_Z1)
-#define READ_Z2 (ADC_ON_12BIT | TSC2007_MEASURE_Z2)
-#define READ_X (ADC_ON_12BIT | TSC2007_MEASURE_X)
-#define PWRDOWN (TSC2007_12BIT | TSC2007_POWER_OFF_IRQ_EN)
-
-struct ts_event {
- u16 x;
- u16 y;
- u16 z1, z2;
-};
-
-struct tsc2007 {
- struct input_dev *input;
- char phys[32];
-
- struct i2c_client *client;
-
- u16 model;
- u16 x_plate_ohms;
- u16 max_rt;
- unsigned long poll_period; /* in jiffies */
- int fuzzx;
- int fuzzy;
- int fuzzz;
-
- unsigned gpio;
- int irq;
-
- wait_queue_head_t wait;
- bool stopped;
-
- int (*get_pendown_state)(struct device *);
- void (*clear_penirq)(void);
-};
-
-static inline 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);
- tc->z2 = tsc2007_xfer(tsc, READ_Z2);
-
- /* Prepare for next touch reading - power down ADC, enable PENIRQ */
- tsc2007_xfer(tsc, PWRDOWN);
-}
-
-static u32 tsc2007_calculate_pressure(struct tsc2007 *tsc, struct ts_event *tc)
-{
- u32 rt = 0;
-
- /* range filtering */
- if (tc->x == MAX_12BIT)
- tc->x = 0;
-
- if (likely(tc->x && tc->z1)) {
- /* compute touch pressure resistance using equation #1 */
- rt = tc->z2 - tc->z1;
- rt *= tc->x;
- rt *= tsc->x_plate_ohms;
- rt /= tc->z1;
- rt = (rt + 2047) >> 12;
- }
-
- return rt;
-}
-
-static 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 */
- tsc2007_read_values(ts, &tc);
-
- rt = tsc2007_calculate_pressure(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), pressure (%4u)\n",
- tc.x, tc.y, rt);
-
- input_report_key(input, BTN_TOUCH, 1);
- input_report_abs(input, ABS_X, tc.x);
- input_report_abs(input, ABS_Y, tc.y);
- 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 irqreturn_t tsc2007_hard_irq(int irq, void *handle)
-{
- struct tsc2007 *ts = handle;
-
- if (tsc2007_is_pen_down(ts))
- return IRQ_WAKE_THREAD;
-
- 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);
-
- 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();
-
- 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);
-}
-
-#ifdef CONFIG_OF
-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 !gpio_get_value(ts->gpio);
-}
-
-static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts)
-{
- struct device_node *np = client->dev.of_node;
- u32 val32;
- u64 val64;
-
- if (!np) {
- dev_err(&client->dev, "missing device tree data\n");
- return -EINVAL;
- }
-
- if (!of_property_read_u32(np, "ti,max-rt", &val32))
- ts->max_rt = val32;
- else
- ts->max_rt = MAX_12BIT;
-
- if (!of_property_read_u32(np, "ti,fuzzx", &val32))
- ts->fuzzx = val32;
-
- if (!of_property_read_u32(np, "ti,fuzzy", &val32))
- ts->fuzzy = val32;
-
- if (!of_property_read_u32(np, "ti,fuzzz", &val32))
- ts->fuzzz = val32;
-
- if (!of_property_read_u64(np, "ti,poll-period", &val64))
- ts->poll_period = msecs_to_jiffies(val64);
- else
- ts->poll_period = msecs_to_jiffies(1);
-
- if (!of_property_read_u32(np, "ti,x-plate-ohms", &val32)) {
- ts->x_plate_ohms = val32;
- } else {
- dev_err(&client->dev, "missing ti,x-plate-ohms devicetree property.");
- return -EINVAL;
- }
-
- ts->gpio = of_get_gpio(np, 0);
- if (gpio_is_valid(ts->gpio))
- ts->get_pendown_state = tsc2007_get_pendown_state_gpio;
- else
- dev_warn(&client->dev,
- "GPIO not specified in DT (of_get_gpio returned %d)\n",
- ts->gpio);
-
- return 0;
-}
-#else
-static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts)
-{
- dev_err(&client->dev, "platform data is required!\n");
- return -EINVAL;
-}
-#endif
-
-static int tsc2007_probe_pdev(struct i2c_client *client, 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(&client->dev, "x_plate_ohms is not set up in platform data");
- 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)
-{
- 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, ts, pdata, id);
- else
- err = tsc2007_probe_dt(client, 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);
-
- 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_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
- input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(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);
- 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();
- }
-
- err = devm_request_threaded_irq(&client->dev, ts->irq,
- tsc2007_hard_irq, 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);
-
- err = input_register_device(input_dev);
- if (err) {
- dev_err(&client->dev,
- "Failed to register input device: %d\n", err);
- return err;
- }
-
- return 0;
-}
-
-static const struct i2c_device_id tsc2007_idtable[] = {
- { "tsc2007", 0 },
- { }
-};
-
-MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);
-
-#ifdef CONFIG_OF
-static const struct of_device_id tsc2007_of_match[] = {
- { .compatible = "ti,tsc2007" },
- { /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, tsc2007_of_match);
-#endif
-
-static struct i2c_driver tsc2007_driver = {
- .driver = {
- .name = "tsc2007",
- .of_match_table = of_match_ptr(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");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.