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Release 4.11 drivers/input/touchscreen/ad7879.c

/*
 * AD7879/AD7889 based touchscreen and GPIO driver
 *
 * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 *
 * History:
 * Copyright (c) 2005 David Brownell
 * Copyright (c) 2006 Nokia Corporation
 * Various changes: Imre Deak <imre.deak@nokia.com>
 *
 * Using code from:
 *  - 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
 *  - ad7877.c
 *      Copyright (C) 2006-2008 Analog Devices Inc.
 */

#include <linux/device.h>
#include <linux/delay.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/i2c.h>
#include <linux/gpio.h>

#include <linux/input/touchscreen.h>
#include <linux/platform_data/ad7879.h>
#include <linux/module.h>
#include "ad7879.h"


#define AD7879_REG_ZEROS		0

#define AD7879_REG_CTRL1		1

#define AD7879_REG_CTRL2		2

#define AD7879_REG_CTRL3		3

#define AD7879_REG_AUX1HIGH		4

#define AD7879_REG_AUX1LOW		5

#define AD7879_REG_TEMP1HIGH		6

#define AD7879_REG_TEMP1LOW		7

#define AD7879_REG_XPLUS		8

#define AD7879_REG_YPLUS		9

#define AD7879_REG_Z1			10

#define AD7879_REG_Z2			11

#define AD7879_REG_AUXVBAT		12

#define AD7879_REG_TEMP			13

#define AD7879_REG_REVID		14

/* Control REG 1 */

#define AD7879_TMR(x)			((x & 0xFF) << 0)

#define AD7879_ACQ(x)			((x & 0x3) << 8)

#define AD7879_MODE_NOC			(0 << 10)	
/* Do not convert */

#define AD7879_MODE_SCC			(1 << 10)	
/* Single channel conversion */

#define AD7879_MODE_SEQ0		(2 << 10)	
/* Sequence 0 in Slave Mode */

#define AD7879_MODE_SEQ1		(3 << 10)	
/* Sequence 1 in Master Mode */

#define AD7879_MODE_INT			(1 << 15)	
/* PENIRQ disabled INT enabled */

/* Control REG 2 */

#define AD7879_FCD(x)			((x & 0x3) << 0)

#define AD7879_RESET			(1 << 4)

#define AD7879_MFS(x)			((x & 0x3) << 5)

#define AD7879_AVG(x)			((x & 0x3) << 7)

#define	AD7879_SER			(1 << 9)	
/* non-differential */

#define	AD7879_DFR			(0 << 9)	
/* differential */

#define AD7879_GPIOPOL			(1 << 10)

#define AD7879_GPIODIR			(1 << 11)

#define AD7879_GPIO_DATA		(1 << 12)

#define AD7879_GPIO_EN			(1 << 13)

#define AD7879_PM(x)			((x & 0x3) << 14)

#define AD7879_PM_SHUTDOWN		(0)

#define AD7879_PM_DYN			(1)

#define AD7879_PM_FULLON		(2)

/* Control REG 3 */

#define AD7879_TEMPMASK_BIT		(1<<15)

#define AD7879_AUXVBATMASK_BIT		(1<<14)

#define AD7879_INTMODE_BIT		(1<<13)

#define AD7879_GPIOALERTMASK_BIT	(1<<12)

#define AD7879_AUXLOW_BIT		(1<<11)

#define AD7879_AUXHIGH_BIT		(1<<10)

#define AD7879_TEMPLOW_BIT		(1<<9)

#define AD7879_TEMPHIGH_BIT		(1<<8)

#define AD7879_YPLUS_BIT		(1<<7)

#define AD7879_XPLUS_BIT		(1<<6)

#define AD7879_Z1_BIT			(1<<5)

#define AD7879_Z2_BIT			(1<<4)

#define AD7879_AUX_BIT			(1<<3)

#define AD7879_VBAT_BIT			(1<<2)

#define AD7879_TEMP_BIT			(1<<1)

enum {
	
AD7879_SEQ_YPOS  = 0,
	
AD7879_SEQ_XPOS  = 1,
	
AD7879_SEQ_Z1    = 2,
	
AD7879_SEQ_Z2    = 3,
	
AD7879_NR_SENSE  = 4,
};


#define	MAX_12BIT			((1<<12)-1)

#define	TS_PEN_UP_TIMEOUT		msecs_to_jiffies(50)


struct ad7879 {
	
const struct ad7879_bus_ops *bops;

	
struct device		*dev;
	
struct input_dev	*input;
	
struct timer_list	timer;
#ifdef CONFIG_GPIOLIB
	
struct gpio_chip	gc;
	
struct mutex		mutex;
#endif
	
unsigned int		irq;
	
bool			disabled;	/* P: input->mutex */
	
bool			suspended;	/* P: input->mutex */
	
bool			swap_xy;
	
u16			conversion_data[AD7879_NR_SENSE];
	
char			phys[32];
	
u8			first_conversion_delay;
	
u8			acquisition_time;
	
u8			averaging;
	
u8			pen_down_acc_interval;
	
u8			median;
	
u16			x_plate_ohms;
	
u16			cmd_crtl1;
	
u16			cmd_crtl2;
	
u16			cmd_crtl3;
	
int			x;
	
int			y;
	
int			Rt;
};


static int ad7879_read(struct ad7879 *ts, u8 reg) { return ts->bops->read(ts->dev, reg); }

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static int ad7879_multi_read(struct ad7879 *ts, u8 first_reg, u8 count, u16 *buf) { return ts->bops->multi_read(ts->dev, first_reg, count, buf); }

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static int ad7879_write(struct ad7879 *ts, u8 reg, u16 val) { return ts->bops->write(ts->dev, reg, val); }

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static int ad7879_report(struct ad7879 *ts) { struct input_dev *input_dev = ts->input; unsigned Rt; u16 x, y, z1, z2; x = ts->conversion_data[AD7879_SEQ_XPOS] & MAX_12BIT; y = ts->conversion_data[AD7879_SEQ_YPOS] & MAX_12BIT; z1 = ts->conversion_data[AD7879_SEQ_Z1] & MAX_12BIT; z2 = ts->conversion_data[AD7879_SEQ_Z2] & MAX_12BIT; if (ts->swap_xy) swap(x, y); /* * The samples processed here are already preprocessed by the AD7879. * The preprocessing function consists of a median and an averaging * filter. The combination of these two techniques provides a robust * solution, discarding the spurious noise in the signal and keeping * only the data of interest. The size of both filters is * programmable. (dev.platform_data, see linux/platform_data/ad7879.h) * Other user-programmable conversion controls include variable * acquisition time, and first conversion delay. Up to 16 averages can * be taken per conversion. */ if (likely(x && z1)) { /* compute touch pressure resistance using equation #1 */ Rt = (z2 - z1) * x * ts->x_plate_ohms; Rt /= z1; Rt = (Rt + 2047) >> 12; /* * Sample found inconsistent, pressure is beyond * the maximum. Don't report it to user space. */ if (Rt > input_abs_get_max(input_dev, ABS_PRESSURE)) return -EINVAL; /* * Note that we delay reporting events by one sample. * This is done to avoid reporting last sample of the * touch sequence, which may be incomplete if finger * leaves the surface before last reading is taken. */ if (timer_pending(&ts->timer)) { /* Touch continues */ input_report_key(input_dev, BTN_TOUCH, 1); input_report_abs(input_dev, ABS_X, ts->x); input_report_abs(input_dev, ABS_Y, ts->y); input_report_abs(input_dev, ABS_PRESSURE, ts->Rt); input_sync(input_dev); } ts->x = x; ts->y = y; ts->Rt = Rt; return 0; } return -EINVAL; }

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static void ad7879_ts_event_release(struct ad7879 *ts) { struct input_dev *input_dev = ts->input; input_report_abs(input_dev, ABS_PRESSURE, 0); input_report_key(input_dev, BTN_TOUCH, 0); input_sync(input_dev); }

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static void ad7879_timer(unsigned long handle) { struct ad7879 *ts = (void *)handle; ad7879_ts_event_release(ts); }

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static irqreturn_t ad7879_irq(int irq, void *handle) { struct ad7879 *ts = handle; ad7879_multi_read(ts, AD7879_REG_XPLUS, AD7879_NR_SENSE, ts->conversion_data); if (!ad7879_report(ts)) mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT); return IRQ_HANDLED; }

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static void __ad7879_enable(struct ad7879 *ts) { ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); ad7879_write(ts, AD7879_REG_CTRL3, ts->cmd_crtl3); ad7879_write(ts, AD7879_REG_CTRL1, ts->cmd_crtl1); enable_irq(ts->irq); }

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static void __ad7879_disable(struct ad7879 *ts) { u16 reg = (ts->cmd_crtl2 & ~AD7879_PM(-1)) | AD7879_PM(AD7879_PM_SHUTDOWN); disable_irq(ts->irq); if (del_timer_sync(&ts->timer)) ad7879_ts_event_release(ts); ad7879_write(ts, AD7879_REG_CTRL2, reg); }

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static int ad7879_open(struct input_dev *input) { struct ad7879 *ts = input_get_drvdata(input); /* protected by input->mutex */ if (!ts->disabled && !ts->suspended) __ad7879_enable(ts); return 0; }

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static void ad7879_close(struct input_dev* input) { struct ad7879 *ts = input_get_drvdata(input); /* protected by input->mutex */ if (!ts->disabled && !ts->suspended) __ad7879_disable(ts); }

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static int __maybe_unused ad7879_suspend(struct device *dev) { struct ad7879 *ts = dev_get_drvdata(dev); mutex_lock(&ts->input->mutex); if (!ts->suspended && !ts->disabled && ts->input->users) __ad7879_disable(ts); ts->suspended = true; mutex_unlock(&ts->input->mutex); return 0; }

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static int __maybe_unused ad7879_resume(struct device *dev) { struct ad7879 *ts = dev_get_drvdata(dev); mutex_lock(&ts->input->mutex); if (ts->suspended && !ts->disabled && ts->input->users) __ad7879_enable(ts); ts->suspended = false; mutex_unlock(&ts->input->mutex); return 0; }

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SIMPLE_DEV_PM_OPS(ad7879_pm_ops, ad7879_suspend, ad7879_resume); EXPORT_SYMBOL(ad7879_pm_ops);
static void ad7879_toggle(struct ad7879 *ts, bool disable) { mutex_lock(&ts->input->mutex); if (!ts->suspended && ts->input->users != 0) { if (disable) { if (ts->disabled) __ad7879_enable(ts); } else { if (!ts->disabled) __ad7879_disable(ts); } } ts->disabled = disable; mutex_unlock(&ts->input->mutex); }

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static ssize_t ad7879_disable_show(struct device *dev, struct device_attribute *attr, char *buf) { struct ad7879 *ts = dev_get_drvdata(dev); return sprintf(buf, "%u\n", ts->disabled); }

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static ssize_t ad7879_disable_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct ad7879 *ts = dev_get_drvdata(dev); unsigned int val; int error; error = kstrtouint(buf, 10, &val); if (error) return error; ad7879_toggle(ts, val); return count; }

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static DEVICE_ATTR(disable, 0664, ad7879_disable_show, ad7879_disable_store); static struct attribute *ad7879_attributes[] = { &dev_attr_disable.attr, NULL }; static const struct attribute_group ad7879_attr_group = { .attrs = ad7879_attributes, }; #ifdef CONFIG_GPIOLIB
static int ad7879_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) { struct ad7879 *ts = gpiochip_get_data(chip); int err; mutex_lock(&ts->mutex); ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIODIR | AD7879_GPIOPOL; err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); mutex_unlock(&ts->mutex); return err; }

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static int ad7879_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level) { struct ad7879 *ts = gpiochip_get_data(chip); int err; mutex_lock(&ts->mutex); ts->cmd_crtl2 &= ~AD7879_GPIODIR; ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIOPOL; if (level) ts->cmd_crtl2 |= AD7879_GPIO_DATA; else ts->cmd_crtl2 &= ~AD7879_GPIO_DATA; err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); mutex_unlock(&ts->mutex); return err; }

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static int ad7879_gpio_get_value(struct gpio_chip *chip, unsigned gpio) { struct ad7879 *ts = gpiochip_get_data(chip); u16 val; mutex_lock(&ts->mutex); val = ad7879_read(ts, AD7879_REG_CTRL2); mutex_unlock(&ts->mutex); return !!(val & AD7879_GPIO_DATA); }

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static void ad7879_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value) { struct ad7879 *ts = gpiochip_get_data(chip); mutex_lock(&ts->mutex); if (value) ts->cmd_crtl2 |= AD7879_GPIO_DATA; else ts->cmd_crtl2 &= ~AD7879_GPIO_DATA; ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); mutex_unlock(&ts->mutex); }

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static int ad7879_gpio_add(struct ad7879 *ts, const struct ad7879_platform_data *pdata) { int ret = 0; mutex_init(&ts->mutex); if (pdata->gpio_export) { ts->gc.direction_input = ad7879_gpio_direction_input; ts->gc.direction_output = ad7879_gpio_direction_output; ts->gc.get = ad7879_gpio_get_value; ts->gc.set = ad7879_gpio_set_value; ts->gc.can_sleep = 1; ts->gc.base = pdata->gpio_base; ts->gc.ngpio = 1; ts->gc.label = "AD7879-GPIO"; ts->gc.owner = THIS_MODULE; ts->gc.parent = ts->dev; ret = gpiochip_add_data(&ts->gc, ts); if (ret) dev_err(ts->dev, "failed to register gpio %d\n", ts->gc.base); } return ret; }

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static void ad7879_gpio_remove(struct ad7879 *ts) { const struct ad7879_platform_data *pdata = dev_get_platdata(ts->dev); if (pdata && pdata->gpio_export) gpiochip_remove(&ts->gc); }

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#else
static inline int ad7879_gpio_add(struct ad7879 *ts, const struct ad7879_platform_data *pdata) { return 0; }

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static inline void ad7879_gpio_remove(struct ad7879 *ts) { }

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#endif
static int ad7879_parse_dt(struct device *dev, struct ad7879 *ts) { int err; u32 tmp; err = device_property_read_u32(dev, "adi,resistance-plate-x", &tmp); if (err) { dev_err(dev, "failed to get resistance-plate-x property\n"); return err; } ts->x_plate_ohms = (u16)tmp; device_property_read_u8(dev, "adi,first-conversion-delay", &ts->first_conversion_delay); device_property_read_u8(dev, "adi,acquisition-time", &ts->acquisition_time); device_property_read_u8(dev, "adi,median-filter-size", &ts->median); 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; }

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struct ad7879 *ad7879_probe(struct device *dev, u8 devid, unsigned int irq, const struct ad7879_bus_ops *bops) { struct ad7879_platform_data *pdata = dev_get_platdata(dev); struct ad7879 *ts; struct input_dev *input_dev; int err; u16 revid; if (!irq) { dev_err(dev, "No IRQ specified\n"); return ERR_PTR(-EINVAL); } ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL); if (!ts) return ERR_PTR(-ENOMEM); if (pdata) { /* Platform data use swapped axis (backward compatibility) */ ts->swap_xy = !pdata->swap_xy; ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; ts->first_conversion_delay = pdata->first_conversion_delay; ts->acquisition_time = pdata->acquisition_time; ts->averaging = pdata->averaging; ts->pen_down_acc_interval = pdata->pen_down_acc_interval; ts->median = pdata->median; } else if (dev->of_node) { ad7879_parse_dt(dev, ts); } else { dev_err(dev, "No platform data\n"); return ERR_PTR(-EINVAL); } input_dev = devm_input_allocate_device(dev); if (!input_dev) { dev_err(dev, "Failed to allocate input device\n"); return ERR_PTR(-ENOMEM); } ts->bops = bops; ts->dev = dev; ts->input = input_dev; ts->irq = irq; setup_timer(&ts->timer, ad7879_timer, (unsigned long) ts); 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 = bops->bustype; input_dev->open = ad7879_open; input_dev->close = ad7879_close; input_set_drvdata(input_dev, ts); __set_bit(EV_ABS, input_dev->evbit); __set_bit(ABS_X, input_dev->absbit); __set_bit(ABS_Y, input_dev->absbit); __set_bit(ABS_PRESSURE, input_dev->absbit); __set_bit(EV_KEY, input_dev->evbit); __set_bit(BTN_TOUCH, input_dev->keybit); if (pdata) { input_set_abs_params(input_dev, ABS_X, pdata->x_min ? : 0, pdata->x_max ? : MAX_12BIT, 0, 0); input_set_abs_params(input_dev, ABS_Y, pdata->y_min ? : 0, pdata->y_max ? : MAX_12BIT, 0, 0); input_set_abs_params(input_dev, ABS_PRESSURE, pdata->pressure_min, pdata->pressure_max ? : ~0, 0, 0); } else { 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); 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 ERR_PTR(-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_PTR(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 ERR_PTR(-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_PTR(err); } __ad7879_disable(ts); err = sysfs_create_group(&dev->kobj, &ad7879_attr_group); if (err) goto err_out; if (pdata) { err = ad7879_gpio_add(ts, pdata); if (err) goto err_remove_attr; } err = input_register_device(input_dev); if (err) goto err_remove_gpio; return ts; err_remove_gpio: ad7879_gpio_remove(ts); err_remove_attr: sysfs_remove_group(&dev->kobj, &ad7879_attr_group); err_out: return