636 lines
15 KiB
C
636 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* AD7879/AD7889 based touchscreen and GPIO driver
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*
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* Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
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*
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* History:
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* Copyright (c) 2005 David Brownell
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* Copyright (c) 2006 Nokia Corporation
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* Various changes: Imre Deak <imre.deak@nokia.com>
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*
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* Using code from:
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* - corgi_ts.c
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* Copyright (C) 2004-2005 Richard Purdie
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* - omap_ts.[hc], ads7846.h, ts_osk.c
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* Copyright (C) 2002 MontaVista Software
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* Copyright (C) 2004 Texas Instruments
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* Copyright (C) 2005 Dirk Behme
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* - ad7877.c
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* Copyright (C) 2006-2008 Analog Devices Inc.
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*/
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/property.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/gpio/driver.h>
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#include <linux/input/touchscreen.h>
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#include <linux/module.h>
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#include "ad7879.h"
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#define AD7879_REG_ZEROS 0
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#define AD7879_REG_CTRL1 1
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#define AD7879_REG_CTRL2 2
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#define AD7879_REG_CTRL3 3
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#define AD7879_REG_AUX1HIGH 4
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#define AD7879_REG_AUX1LOW 5
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#define AD7879_REG_TEMP1HIGH 6
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#define AD7879_REG_TEMP1LOW 7
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#define AD7879_REG_XPLUS 8
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#define AD7879_REG_YPLUS 9
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#define AD7879_REG_Z1 10
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#define AD7879_REG_Z2 11
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#define AD7879_REG_AUXVBAT 12
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#define AD7879_REG_TEMP 13
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#define AD7879_REG_REVID 14
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/* Control REG 1 */
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#define AD7879_TMR(x) ((x & 0xFF) << 0)
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#define AD7879_ACQ(x) ((x & 0x3) << 8)
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#define AD7879_MODE_NOC (0 << 10) /* Do not convert */
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#define AD7879_MODE_SCC (1 << 10) /* Single channel conversion */
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#define AD7879_MODE_SEQ0 (2 << 10) /* Sequence 0 in Slave Mode */
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#define AD7879_MODE_SEQ1 (3 << 10) /* Sequence 1 in Master Mode */
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#define AD7879_MODE_INT (1 << 15) /* PENIRQ disabled INT enabled */
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/* Control REG 2 */
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#define AD7879_FCD(x) ((x & 0x3) << 0)
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#define AD7879_RESET (1 << 4)
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#define AD7879_MFS(x) ((x & 0x3) << 5)
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#define AD7879_AVG(x) ((x & 0x3) << 7)
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#define AD7879_SER (1 << 9) /* non-differential */
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#define AD7879_DFR (0 << 9) /* differential */
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#define AD7879_GPIOPOL (1 << 10)
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#define AD7879_GPIODIR (1 << 11)
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#define AD7879_GPIO_DATA (1 << 12)
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#define AD7879_GPIO_EN (1 << 13)
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#define AD7879_PM(x) ((x & 0x3) << 14)
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#define AD7879_PM_SHUTDOWN (0)
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#define AD7879_PM_DYN (1)
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#define AD7879_PM_FULLON (2)
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/* Control REG 3 */
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#define AD7879_TEMPMASK_BIT (1<<15)
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#define AD7879_AUXVBATMASK_BIT (1<<14)
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#define AD7879_INTMODE_BIT (1<<13)
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#define AD7879_GPIOALERTMASK_BIT (1<<12)
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#define AD7879_AUXLOW_BIT (1<<11)
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#define AD7879_AUXHIGH_BIT (1<<10)
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#define AD7879_TEMPLOW_BIT (1<<9)
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#define AD7879_TEMPHIGH_BIT (1<<8)
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#define AD7879_YPLUS_BIT (1<<7)
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#define AD7879_XPLUS_BIT (1<<6)
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#define AD7879_Z1_BIT (1<<5)
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#define AD7879_Z2_BIT (1<<4)
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#define AD7879_AUX_BIT (1<<3)
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#define AD7879_VBAT_BIT (1<<2)
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#define AD7879_TEMP_BIT (1<<1)
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enum {
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AD7879_SEQ_YPOS = 0,
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AD7879_SEQ_XPOS = 1,
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AD7879_SEQ_Z1 = 2,
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AD7879_SEQ_Z2 = 3,
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AD7879_NR_SENSE = 4,
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};
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#define MAX_12BIT ((1<<12)-1)
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#define TS_PEN_UP_TIMEOUT msecs_to_jiffies(50)
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struct ad7879 {
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struct regmap *regmap;
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struct device *dev;
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struct input_dev *input;
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struct timer_list timer;
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#ifdef CONFIG_GPIOLIB
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struct gpio_chip gc;
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struct mutex mutex;
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#endif
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unsigned int irq;
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bool disabled; /* P: input->mutex */
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bool suspended; /* P: input->mutex */
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bool swap_xy;
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u16 conversion_data[AD7879_NR_SENSE];
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char phys[32];
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u8 first_conversion_delay;
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u8 acquisition_time;
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u8 averaging;
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u8 pen_down_acc_interval;
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u8 median;
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u16 x_plate_ohms;
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u16 cmd_crtl1;
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u16 cmd_crtl2;
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u16 cmd_crtl3;
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int x;
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int y;
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int Rt;
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};
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static int ad7879_read(struct ad7879 *ts, u8 reg)
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{
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unsigned int val;
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int error;
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error = regmap_read(ts->regmap, reg, &val);
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if (error) {
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dev_err(ts->dev, "failed to read register %#02x: %d\n",
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reg, error);
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return error;
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}
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return val;
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}
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static int ad7879_write(struct ad7879 *ts, u8 reg, u16 val)
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{
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int error;
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error = regmap_write(ts->regmap, reg, val);
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if (error) {
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dev_err(ts->dev,
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"failed to write %#04x to register %#02x: %d\n",
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val, reg, 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 ad7879_report(struct ad7879 *ts)
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{
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struct input_dev *input_dev = ts->input;
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unsigned Rt;
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u16 x, y, z1, z2;
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x = ts->conversion_data[AD7879_SEQ_XPOS] & MAX_12BIT;
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y = ts->conversion_data[AD7879_SEQ_YPOS] & MAX_12BIT;
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z1 = ts->conversion_data[AD7879_SEQ_Z1] & MAX_12BIT;
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z2 = ts->conversion_data[AD7879_SEQ_Z2] & MAX_12BIT;
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if (ts->swap_xy)
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swap(x, y);
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/*
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* The samples processed here are already preprocessed by the AD7879.
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* The preprocessing function consists of a median and an averaging
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* filter. The combination of these two techniques provides a robust
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* solution, discarding the spurious noise in the signal and keeping
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* only the data of interest. The size of both filters is
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* programmable. (dev.platform_data, see linux/platform_data/ad7879.h)
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* Other user-programmable conversion controls include variable
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* acquisition time, and first conversion delay. Up to 16 averages can
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* be taken per conversion.
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*/
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if (likely(x && z1)) {
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/* compute touch pressure resistance using equation #1 */
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Rt = (z2 - z1) * x * ts->x_plate_ohms;
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Rt /= z1;
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Rt = (Rt + 2047) >> 12;
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/*
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* Sample found inconsistent, pressure is beyond
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* the maximum. Don't report it to user space.
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*/
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if (Rt > input_abs_get_max(input_dev, ABS_PRESSURE))
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return -EINVAL;
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/*
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* Note that we delay reporting events by one sample.
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* This is done to avoid reporting last sample of the
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* touch sequence, which may be incomplete if finger
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* leaves the surface before last reading is taken.
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*/
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if (timer_pending(&ts->timer)) {
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/* Touch continues */
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input_report_key(input_dev, BTN_TOUCH, 1);
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input_report_abs(input_dev, ABS_X, ts->x);
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input_report_abs(input_dev, ABS_Y, ts->y);
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input_report_abs(input_dev, ABS_PRESSURE, ts->Rt);
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input_sync(input_dev);
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}
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ts->x = x;
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ts->y = y;
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ts->Rt = Rt;
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return 0;
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}
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return -EINVAL;
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}
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static void ad7879_ts_event_release(struct ad7879 *ts)
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{
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struct input_dev *input_dev = ts->input;
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input_report_abs(input_dev, ABS_PRESSURE, 0);
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input_report_key(input_dev, BTN_TOUCH, 0);
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input_sync(input_dev);
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}
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static void ad7879_timer(struct timer_list *t)
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{
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struct ad7879 *ts = from_timer(ts, t, timer);
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ad7879_ts_event_release(ts);
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}
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static irqreturn_t ad7879_irq(int irq, void *handle)
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{
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struct ad7879 *ts = handle;
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int error;
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error = regmap_bulk_read(ts->regmap, AD7879_REG_XPLUS,
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ts->conversion_data, AD7879_NR_SENSE);
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if (error)
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dev_err_ratelimited(ts->dev, "failed to read %#02x: %d\n",
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AD7879_REG_XPLUS, error);
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else if (!ad7879_report(ts))
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mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
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return IRQ_HANDLED;
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}
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static void __ad7879_enable(struct ad7879 *ts)
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{
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ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
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ad7879_write(ts, AD7879_REG_CTRL3, ts->cmd_crtl3);
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ad7879_write(ts, AD7879_REG_CTRL1, ts->cmd_crtl1);
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enable_irq(ts->irq);
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}
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static void __ad7879_disable(struct ad7879 *ts)
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{
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u16 reg = (ts->cmd_crtl2 & ~AD7879_PM(-1)) |
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AD7879_PM(AD7879_PM_SHUTDOWN);
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disable_irq(ts->irq);
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if (del_timer_sync(&ts->timer))
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ad7879_ts_event_release(ts);
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ad7879_write(ts, AD7879_REG_CTRL2, reg);
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}
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static int ad7879_open(struct input_dev *input)
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{
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struct ad7879 *ts = input_get_drvdata(input);
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/* protected by input->mutex */
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if (!ts->disabled && !ts->suspended)
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__ad7879_enable(ts);
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return 0;
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}
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static void ad7879_close(struct input_dev *input)
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{
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struct ad7879 *ts = input_get_drvdata(input);
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/* protected by input->mutex */
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if (!ts->disabled && !ts->suspended)
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__ad7879_disable(ts);
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}
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static int __maybe_unused ad7879_suspend(struct device *dev)
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{
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struct ad7879 *ts = dev_get_drvdata(dev);
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mutex_lock(&ts->input->mutex);
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if (!ts->suspended && !ts->disabled && input_device_enabled(ts->input))
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__ad7879_disable(ts);
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ts->suspended = true;
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mutex_unlock(&ts->input->mutex);
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return 0;
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}
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static int __maybe_unused ad7879_resume(struct device *dev)
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{
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struct ad7879 *ts = dev_get_drvdata(dev);
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mutex_lock(&ts->input->mutex);
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if (ts->suspended && !ts->disabled && input_device_enabled(ts->input))
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__ad7879_enable(ts);
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ts->suspended = false;
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mutex_unlock(&ts->input->mutex);
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return 0;
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}
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SIMPLE_DEV_PM_OPS(ad7879_pm_ops, ad7879_suspend, ad7879_resume);
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EXPORT_SYMBOL(ad7879_pm_ops);
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static void ad7879_toggle(struct ad7879 *ts, bool disable)
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{
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mutex_lock(&ts->input->mutex);
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if (!ts->suspended && input_device_enabled(ts->input)) {
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if (disable) {
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if (ts->disabled)
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__ad7879_enable(ts);
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} else {
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if (!ts->disabled)
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__ad7879_disable(ts);
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}
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}
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ts->disabled = disable;
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mutex_unlock(&ts->input->mutex);
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}
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static ssize_t ad7879_disable_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ad7879 *ts = dev_get_drvdata(dev);
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return sprintf(buf, "%u\n", ts->disabled);
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}
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static ssize_t ad7879_disable_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ad7879 *ts = dev_get_drvdata(dev);
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unsigned int val;
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int error;
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error = kstrtouint(buf, 10, &val);
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if (error)
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return error;
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ad7879_toggle(ts, val);
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return count;
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}
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static DEVICE_ATTR(disable, 0664, ad7879_disable_show, ad7879_disable_store);
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static struct attribute *ad7879_attributes[] = {
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&dev_attr_disable.attr,
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NULL
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};
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static const struct attribute_group ad7879_attr_group = {
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.attrs = ad7879_attributes,
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};
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#ifdef CONFIG_GPIOLIB
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static int ad7879_gpio_direction_input(struct gpio_chip *chip,
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unsigned gpio)
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{
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struct ad7879 *ts = gpiochip_get_data(chip);
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int err;
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mutex_lock(&ts->mutex);
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ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIODIR | AD7879_GPIOPOL;
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err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
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mutex_unlock(&ts->mutex);
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return err;
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}
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static int ad7879_gpio_direction_output(struct gpio_chip *chip,
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unsigned gpio, int level)
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{
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struct ad7879 *ts = gpiochip_get_data(chip);
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int err;
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mutex_lock(&ts->mutex);
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ts->cmd_crtl2 &= ~AD7879_GPIODIR;
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ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIOPOL;
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if (level)
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ts->cmd_crtl2 |= AD7879_GPIO_DATA;
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else
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ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
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err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
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mutex_unlock(&ts->mutex);
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return err;
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}
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static int ad7879_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
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{
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struct ad7879 *ts = gpiochip_get_data(chip);
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u16 val;
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mutex_lock(&ts->mutex);
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val = ad7879_read(ts, AD7879_REG_CTRL2);
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mutex_unlock(&ts->mutex);
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return !!(val & AD7879_GPIO_DATA);
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}
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static void ad7879_gpio_set_value(struct gpio_chip *chip,
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unsigned gpio, int value)
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{
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struct ad7879 *ts = gpiochip_get_data(chip);
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mutex_lock(&ts->mutex);
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if (value)
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ts->cmd_crtl2 |= AD7879_GPIO_DATA;
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else
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ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
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ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
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mutex_unlock(&ts->mutex);
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}
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static int ad7879_gpio_add(struct ad7879 *ts)
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{
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int ret = 0;
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mutex_init(&ts->mutex);
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/* Do not create a chip unless flagged for it */
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if (!device_property_read_bool(ts->dev, "gpio-controller"))
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return 0;
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ts->gc.direction_input = ad7879_gpio_direction_input;
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ts->gc.direction_output = ad7879_gpio_direction_output;
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ts->gc.get = ad7879_gpio_get_value;
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ts->gc.set = ad7879_gpio_set_value;
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ts->gc.can_sleep = 1;
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ts->gc.base = -1;
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ts->gc.ngpio = 1;
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ts->gc.label = "AD7879-GPIO";
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ts->gc.owner = THIS_MODULE;
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ts->gc.parent = ts->dev;
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ret = devm_gpiochip_add_data(ts->dev, &ts->gc, ts);
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if (ret)
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dev_err(ts->dev, "failed to register gpio %d\n",
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ts->gc.base);
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return ret;
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}
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#else
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static int ad7879_gpio_add(struct ad7879 *ts)
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{
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return 0;
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}
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#endif
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static int ad7879_parse_dt(struct device *dev, struct ad7879 *ts)
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{
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int err;
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u32 tmp;
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err = device_property_read_u32(dev, "adi,resistance-plate-x", &tmp);
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if (err) {
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dev_err(dev, "failed to get resistance-plate-x property\n");
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return err;
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}
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ts->x_plate_ohms = (u16)tmp;
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device_property_read_u8(dev, "adi,first-conversion-delay",
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&ts->first_conversion_delay);
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device_property_read_u8(dev, "adi,acquisition-time",
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&ts->acquisition_time);
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device_property_read_u8(dev, "adi,median-filter-size", &ts->median);
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device_property_read_u8(dev, "adi,averaging", &ts->averaging);
|
|
device_property_read_u8(dev, "adi,conversion-interval",
|
|
&ts->pen_down_acc_interval);
|
|
|
|
ts->swap_xy = device_property_read_bool(dev, "touchscreen-swapped-x-y");
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ad7879_probe(struct device *dev, struct regmap *regmap,
|
|
int irq, u16 bustype, u8 devid)
|
|
{
|
|
struct ad7879 *ts;
|
|
struct input_dev *input_dev;
|
|
int err;
|
|
u16 revid;
|
|
|
|
if (irq <= 0) {
|
|
dev_err(dev, "No IRQ specified\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
|
|
if (!ts)
|
|
return -ENOMEM;
|
|
|
|
err = ad7879_parse_dt(dev, ts);
|
|
if (err)
|
|
return err;
|
|
|
|
input_dev = devm_input_allocate_device(dev);
|
|
if (!input_dev) {
|
|
dev_err(dev, "Failed to allocate input device\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ts->dev = dev;
|
|
ts->input = input_dev;
|
|
ts->irq = irq;
|
|
ts->regmap = regmap;
|
|
|
|
timer_setup(&ts->timer, ad7879_timer, 0);
|
|
snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
|
|
|
|
input_dev->name = "AD7879 Touchscreen";
|
|
input_dev->phys = ts->phys;
|
|
input_dev->dev.parent = dev;
|
|
input_dev->id.bustype = bustype;
|
|
|
|
input_dev->open = ad7879_open;
|
|
input_dev->close = ad7879_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, 0, 0);
|
|
input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
|
|
input_set_capability(input_dev, EV_ABS, ABS_PRESSURE);
|
|
touchscreen_parse_properties(input_dev, false, NULL);
|
|
if (!input_abs_get_max(input_dev, ABS_PRESSURE)) {
|
|
dev_err(dev, "Touchscreen pressure is not specified\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = ad7879_write(ts, AD7879_REG_CTRL2, AD7879_RESET);
|
|
if (err < 0) {
|
|
dev_err(dev, "Failed to write %s\n", input_dev->name);
|
|
return err;
|
|
}
|
|
|
|
revid = ad7879_read(ts, AD7879_REG_REVID);
|
|
input_dev->id.product = (revid & 0xff);
|
|
input_dev->id.version = revid >> 8;
|
|
if (input_dev->id.product != devid) {
|
|
dev_err(dev, "Failed to probe %s (%x vs %x)\n",
|
|
input_dev->name, devid, revid);
|
|
return -ENODEV;
|
|
}
|
|
|
|
ts->cmd_crtl3 = AD7879_YPLUS_BIT |
|
|
AD7879_XPLUS_BIT |
|
|
AD7879_Z2_BIT |
|
|
AD7879_Z1_BIT |
|
|
AD7879_TEMPMASK_BIT |
|
|
AD7879_AUXVBATMASK_BIT |
|
|
AD7879_GPIOALERTMASK_BIT;
|
|
|
|
ts->cmd_crtl2 = AD7879_PM(AD7879_PM_DYN) | AD7879_DFR |
|
|
AD7879_AVG(ts->averaging) |
|
|
AD7879_MFS(ts->median) |
|
|
AD7879_FCD(ts->first_conversion_delay);
|
|
|
|
ts->cmd_crtl1 = AD7879_MODE_INT | AD7879_MODE_SEQ1 |
|
|
AD7879_ACQ(ts->acquisition_time) |
|
|
AD7879_TMR(ts->pen_down_acc_interval);
|
|
|
|
err = devm_request_threaded_irq(dev, ts->irq, NULL, ad7879_irq,
|
|
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
|
dev_name(dev), ts);
|
|
if (err) {
|
|
dev_err(dev, "Failed to request IRQ: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
__ad7879_disable(ts);
|
|
|
|
err = devm_device_add_group(dev, &ad7879_attr_group);
|
|
if (err)
|
|
return err;
|
|
|
|
err = ad7879_gpio_add(ts);
|
|
if (err)
|
|
return err;
|
|
|
|
err = input_register_device(input_dev);
|
|
if (err)
|
|
return err;
|
|
|
|
dev_set_drvdata(dev, ts);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ad7879_probe);
|
|
|
|
MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
|
|
MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver");
|
|
MODULE_LICENSE("GPL");
|