297 lines
7 KiB
C
297 lines
7 KiB
C
/*
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* Touchscreen driver for the tps6507x chip.
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*
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* Copyright (c) 2009 RidgeRun (todd.fischer@ridgerun.com)
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*
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* Credits:
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*
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* Using code from tsc2007, MtekVision Co., Ltd.
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*
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* For licencing details see kernel-base/COPYING
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*
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* TPS65070, TPS65073, TPS650731, and TPS650732 support
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* 10 bit touch screen interface.
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*/
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#include <linux/module.h>
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#include <linux/workqueue.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/input-polldev.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/tps6507x.h>
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#include <linux/input/tps6507x-ts.h>
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#include <linux/delay.h>
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#define TSC_DEFAULT_POLL_PERIOD 30 /* ms */
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#define TPS_DEFAULT_MIN_PRESSURE 0x30
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#define MAX_10BIT ((1 << 10) - 1)
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#define TPS6507X_ADCONFIG_CONVERT_TS (TPS6507X_ADCONFIG_AD_ENABLE | \
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TPS6507X_ADCONFIG_START_CONVERSION | \
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TPS6507X_ADCONFIG_INPUT_REAL_TSC)
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#define TPS6507X_ADCONFIG_POWER_DOWN_TS (TPS6507X_ADCONFIG_INPUT_REAL_TSC)
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struct ts_event {
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u16 x;
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u16 y;
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u16 pressure;
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};
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struct tps6507x_ts {
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struct device *dev;
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struct input_polled_dev *poll_dev;
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struct tps6507x_dev *mfd;
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char phys[32];
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struct ts_event tc;
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u16 min_pressure;
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bool pendown;
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};
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static int tps6507x_read_u8(struct tps6507x_ts *tsc, u8 reg, u8 *data)
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{
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return tsc->mfd->read_dev(tsc->mfd, reg, 1, data);
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}
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static int tps6507x_write_u8(struct tps6507x_ts *tsc, u8 reg, u8 data)
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{
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return tsc->mfd->write_dev(tsc->mfd, reg, 1, &data);
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}
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static s32 tps6507x_adc_conversion(struct tps6507x_ts *tsc,
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u8 tsc_mode, u16 *value)
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{
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s32 ret;
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u8 adc_status;
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u8 result;
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/* Route input signal to A/D converter */
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ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE, tsc_mode);
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if (ret) {
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dev_err(tsc->dev, "TSC mode read failed\n");
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goto err;
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}
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/* Start A/D conversion */
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ret = tps6507x_write_u8(tsc, TPS6507X_REG_ADCONFIG,
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TPS6507X_ADCONFIG_CONVERT_TS);
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if (ret) {
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dev_err(tsc->dev, "ADC config write failed\n");
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return ret;
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}
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do {
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ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADCONFIG,
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&adc_status);
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if (ret) {
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dev_err(tsc->dev, "ADC config read failed\n");
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goto err;
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}
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} while (adc_status & TPS6507X_ADCONFIG_START_CONVERSION);
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ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_2, &result);
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if (ret) {
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dev_err(tsc->dev, "ADC result 2 read failed\n");
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goto err;
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}
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*value = (result & TPS6507X_REG_ADRESULT_2_MASK) << 8;
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ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_1, &result);
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if (ret) {
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dev_err(tsc->dev, "ADC result 1 read failed\n");
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goto err;
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}
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*value |= result;
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dev_dbg(tsc->dev, "TSC channel %d = 0x%X\n", tsc_mode, *value);
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err:
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return ret;
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}
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/* Need to call tps6507x_adc_standby() after using A/D converter for the
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* touch screen interrupt to work properly.
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*/
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static s32 tps6507x_adc_standby(struct tps6507x_ts *tsc)
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{
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s32 ret;
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s32 loops = 0;
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u8 val;
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ret = tps6507x_write_u8(tsc, TPS6507X_REG_ADCONFIG,
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TPS6507X_ADCONFIG_INPUT_TSC);
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if (ret)
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return ret;
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ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE,
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TPS6507X_TSCMODE_STANDBY);
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if (ret)
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return ret;
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ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val);
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if (ret)
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return ret;
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while (val & TPS6507X_REG_TSC_INT) {
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mdelay(10);
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ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val);
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if (ret)
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return ret;
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loops++;
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}
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return ret;
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}
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static void tps6507x_ts_poll(struct input_polled_dev *poll_dev)
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{
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struct tps6507x_ts *tsc = poll_dev->private;
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struct input_dev *input_dev = poll_dev->input;
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bool pendown;
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s32 ret;
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ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_PRESSURE,
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&tsc->tc.pressure);
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if (ret)
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goto done;
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pendown = tsc->tc.pressure > tsc->min_pressure;
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if (unlikely(!pendown && tsc->pendown)) {
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dev_dbg(tsc->dev, "UP\n");
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input_report_key(input_dev, BTN_TOUCH, 0);
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input_report_abs(input_dev, ABS_PRESSURE, 0);
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input_sync(input_dev);
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tsc->pendown = false;
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}
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if (pendown) {
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if (!tsc->pendown) {
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dev_dbg(tsc->dev, "DOWN\n");
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input_report_key(input_dev, BTN_TOUCH, 1);
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} else
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dev_dbg(tsc->dev, "still down\n");
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ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_X_POSITION,
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&tsc->tc.x);
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if (ret)
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goto done;
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ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_Y_POSITION,
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&tsc->tc.y);
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if (ret)
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goto done;
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input_report_abs(input_dev, ABS_X, tsc->tc.x);
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input_report_abs(input_dev, ABS_Y, tsc->tc.y);
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input_report_abs(input_dev, ABS_PRESSURE, tsc->tc.pressure);
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input_sync(input_dev);
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tsc->pendown = true;
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}
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done:
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tps6507x_adc_standby(tsc);
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}
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static int tps6507x_ts_probe(struct platform_device *pdev)
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{
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struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
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const struct tps6507x_board *tps_board;
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const struct touchscreen_init_data *init_data;
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struct tps6507x_ts *tsc;
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struct input_polled_dev *poll_dev;
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struct input_dev *input_dev;
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int error;
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/*
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* tps_board points to pmic related constants
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* coming from the board-evm file.
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*/
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tps_board = dev_get_platdata(tps6507x_dev->dev);
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if (!tps_board) {
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dev_err(tps6507x_dev->dev,
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"Could not find tps6507x platform data\n");
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return -ENODEV;
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}
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/*
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* init_data points to array of regulator_init structures
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* coming from the board-evm file.
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*/
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init_data = tps_board->tps6507x_ts_init_data;
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tsc = devm_kzalloc(&pdev->dev, sizeof(struct tps6507x_ts), GFP_KERNEL);
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if (!tsc) {
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dev_err(tps6507x_dev->dev, "failed to allocate driver data\n");
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return -ENOMEM;
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}
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tsc->mfd = tps6507x_dev;
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tsc->dev = tps6507x_dev->dev;
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tsc->min_pressure = init_data ?
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init_data->min_pressure : TPS_DEFAULT_MIN_PRESSURE;
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snprintf(tsc->phys, sizeof(tsc->phys),
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"%s/input0", dev_name(tsc->dev));
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poll_dev = devm_input_allocate_polled_device(&pdev->dev);
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if (!poll_dev) {
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dev_err(tsc->dev, "Failed to allocate polled input device.\n");
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return -ENOMEM;
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}
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tsc->poll_dev = poll_dev;
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poll_dev->private = tsc;
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poll_dev->poll = tps6507x_ts_poll;
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poll_dev->poll_interval = init_data ?
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init_data->poll_period : TSC_DEFAULT_POLL_PERIOD;
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input_dev = poll_dev->input;
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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input_set_abs_params(input_dev, ABS_X, 0, MAX_10BIT, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 0, MAX_10BIT, 0, 0);
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input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_10BIT, 0, 0);
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input_dev->name = "TPS6507x Touchscreen";
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input_dev->phys = tsc->phys;
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input_dev->dev.parent = tsc->dev;
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input_dev->id.bustype = BUS_I2C;
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if (init_data) {
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input_dev->id.vendor = init_data->vendor;
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input_dev->id.product = init_data->product;
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input_dev->id.version = init_data->version;
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}
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error = tps6507x_adc_standby(tsc);
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if (error)
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return error;
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error = input_register_polled_device(poll_dev);
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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 struct platform_driver tps6507x_ts_driver = {
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.driver = {
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.name = "tps6507x-ts",
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},
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.probe = tps6507x_ts_probe,
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};
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module_platform_driver(tps6507x_ts_driver);
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MODULE_AUTHOR("Todd Fischer <todd.fischer@ridgerun.com>");
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MODULE_DESCRIPTION("TPS6507x - TouchScreen driver");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:tps6507x-ts");
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