--- /dev/null
+/*
+ * drivers/input/touchscreen/rk2818_spi_xpt2046_ts.c - driver for rk2818 spi xpt2046 device and console
+ *
+ * Copyright (C) 2010 ROCKCHIP, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/hwmon.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/spi/spi.h>
+#include <asm/irq.h>
+
+#include "rk2818_spi_xpt2046_ts.h"
+
+/*
+ * This code has been heavily tested on a Nokia 770, and lightly
+ * tested on other xpt2046 devices (OSK/Mistral, Lubbock).
+ * TSC2046 is just newer xpt2046 silicon.
+ * Support for ads7843 tested on Atmel at91sam926x-EK.
+ * Support for ads7845 has only been stubbed in.
+ *
+ * IRQ handling needs a workaround because of a shortcoming in handling
+ * edge triggered IRQs on some platforms like the OMAP1/2. These
+ * platforms don't handle the ARM lazy IRQ disabling properly, thus we
+ * have to maintain our own SW IRQ disabled status. This should be
+ * removed as soon as the affected platform's IRQ handling is fixed.
+ *
+ * app note sbaa036 talks in more detail about accurate sampling...
+ * that ought to help in situations like LCDs inducing noise (which
+ * can also be helped by using synch signals) and more generally.
+ * This driver tries to utilize the measures described in the app
+ * note. The strength of filtering can be set in the board-* specific
+ * files.
+ */
+#define LCD_MAX_LENGTH 800
+#define LCD_MAX_WIDTH 480
+#define PT2046_TOUCH_AD_LEFT 3855
+#define PT2046_TOUCH_AD_RIGHT 260
+#define PT2046_TOUCH_AD_TOP 300
+#define PT2046_TOUCH_AD_BOTTOM 3755
+#define AD_TO_X(adx) (LCD_MAX_WIDTH * (adx - PT2046_TOUCH_AD_TOP) / ( PT2046_TOUCH_AD_BOTTOM - PT2046_TOUCH_AD_TOP ))
+#define AD_TO_Y(ady) (LCD_MAX_LENGTH * (PT2046_TOUCH_AD_LEFT - ady) / (PT2046_TOUCH_AD_LEFT - PT2046_TOUCH_AD_RIGHT))
+
+#define TS_POLL_DELAY (15 * 1000000) /* ns delay before the first sample */
+#define TS_POLL_PERIOD (15 * 1000000) /* ns delay between samples */
+
+#define DEBOUNCE_REPTIME 3
+/* this driver doesn't aim at the peak continuous sample rate */
+#define SAMPLE_BITS (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */)
+
+struct ts_event {
+ /* For portability, we can't read 12 bit values using SPI (which
+ * would make the controller deliver them as native byteorder u16
+ * with msbs zeroed). Instead, we read them as two 8-bit values,
+ * *** WHICH NEED BYTESWAPPING *** and range adjustment.
+ */
+ u16 x;
+ u16 y;
+ int ignore;
+};
+
+/*
+ * We allocate this separately to avoid cache line sharing issues when
+ * driver is used with DMA-based SPI controllers (like atmel_spi) on
+ * systems where main memory is not DMA-coherent (most non-x86 boards).
+ */
+struct xpt2046_packet {
+ u8 read_x, read_y, pwrdown;
+ u16 dummy; /* for the pwrdown read */
+ struct ts_event tc;
+};
+
+struct xpt2046 {
+ struct input_dev *input;
+ char phys[32];
+ char name[32];
+
+ struct spi_device *spi;
+
+ u16 model;
+ bool swap_xy;
+
+ struct xpt2046_packet *packet;
+
+ struct spi_transfer xfer[18];
+ struct spi_message msg[5];
+ struct spi_message *last_msg;
+ int msg_idx;
+ int read_cnt;
+ int read_rep;
+ int last_read;
+
+ u16 debounce_max;
+ u16 debounce_tol;
+ u16 debounce_rep;
+
+ u16 penirq_recheck_delay_usecs;
+
+ spinlock_t lock;
+ struct hrtimer timer;
+ unsigned pendown:1; /* P: lock */
+ unsigned pending:1; /* P: lock */
+// FIXME remove "irq_disabled"
+ unsigned irq_disabled:1; /* P: lock */
+ unsigned disabled:1;
+ unsigned is_suspended:1;
+
+ int (*filter)(void *data, int data_idx, int *val);
+ void *filter_data;
+ void (*filter_cleanup)(void *data);
+ int (*get_pendown_state)(void);
+ int gpio_pendown;
+
+ void (*wait_for_sync)(void);
+};
+
+/* leave chip selected when we're done, for quicker re-select? */
+#if 0
+#define CS_CHANGE(xfer) ((xfer).cs_change = 1)
+#else
+#define CS_CHANGE(xfer) ((xfer).cs_change = 0)
+#endif
+
+/*--------------------------------------------------------------------------*/
+
+/* The xpt2046 has touchscreen and other sensors.
+ * Earlier xpt2046 chips are somewhat compatible.
+ */
+#define XPT2046_START (1 << 7)
+#define XPT2046_A2A1A0_d_y (1 << 4) /* differential */
+#define XPT2046_A2A1A0_d_z1 (3 << 4) /* differential */
+#define XPT2046_A2A1A0_d_z2 (4 << 4) /* differential */
+#define XPT2046_A2A1A0_d_x (5 << 4) /* differential */
+#define XPT2046_A2A1A0_temp0 (0 << 4) /* non-differential */
+#define XPT2046_A2A1A0_vbatt (2 << 4) /* non-differential */
+#define XPT2046_A2A1A0_vaux (6 << 4) /* non-differential */
+#define XPT2046_A2A1A0_temp1 (7 << 4) /* non-differential */
+#define XPT2046_8_BIT (1 << 3)
+#define XPT2046_12_BIT (0 << 3)
+#define XPT2046_SER (1 << 2) /* non-differential */
+#define XPT2046_DFR (0 << 2) /* differential */
+#define XPT2046_PD10_PDOWN (0 << 0) /* lowpower mode + penirq */
+#define XPT2046_PD10_ADC_ON (1 << 0) /* ADC on */
+#define XPT2046_PD10_REF_ON (2 << 0) /* vREF on + penirq */
+#define XPT2046_PD10_ALL_ON (3 << 0) /* ADC + vREF on */
+
+#define MAX_12BIT ((1<<12)-1)
+
+/* leave ADC powered up (disables penirq) between differential samples */
+#define READ_12BIT_DFR(x, adc, vref) (XPT2046_START | XPT2046_A2A1A0_d_ ## x \
+ | XPT2046_12_BIT | XPT2046_DFR | \
+ (adc ? XPT2046_PD10_ADC_ON : 0) | (vref ? XPT2046_PD10_REF_ON : 0))
+
+#define READ_Y(vref) (READ_12BIT_DFR(y, 1, vref))
+#define READ_Z1(vref) (READ_12BIT_DFR(z1, 1, vref))
+#define READ_Z2(vref) (READ_12BIT_DFR(z2, 1, vref))
+
+#define READ_X(vref) (READ_12BIT_DFR(x, 1, vref))
+#define PWRDOWN (READ_12BIT_DFR(y, 0, 0)) /* LAST */
+
+/* single-ended samples need to first power up reference voltage;
+ * we leave both ADC and VREF powered
+ */
+#define READ_12BIT_SER(x) (XPT2046_START | XPT2046_A2A1A0_ ## x \
+ | XPT2046_12_BIT | XPT2046_SER)
+
+#define REF_ON (READ_12BIT_DFR(x, 1, 1))
+#define REF_OFF (READ_12BIT_DFR(y, 0, 0))
+
+/*--------------------------------------------------------------------------*/
+/*
+ * touchscreen sensors use differential conversions.
+ */
+
+struct dfr_req {
+ u8 command;
+ u8 pwrdown;
+ u16 dummy; /* for the pwrdown read */
+ __be16 sample;
+ struct spi_message msg;
+ struct spi_transfer xfer[4];
+};
+
+static struct xpt2046_platform_data xpt2046_info = {
+ .model = 2046,
+ .keep_vref_on = 1,
+ .swap_xy = 1,
+ .x_min = 0,
+ .x_max = 800,
+ .y_min = 0,
+ .y_max = 480,
+ .debounce_max = 7,
+ .debounce_rep = DEBOUNCE_REPTIME,
+ .debounce_tol = 20,
+ .gpio_pendown = RK2818_PIN_PE3,
+
+};
+static void xpt2046_enable(struct xpt2046 *ts);
+static void xpt2046_disable(struct xpt2046 *ts);
+
+static int device_suspended(struct device *dev)
+{
+ struct xpt2046 *ts = dev_get_drvdata(dev);
+ return ts->is_suspended || ts->disabled;
+}
+
+static int xpt2046_read12_dfr(struct device *dev, unsigned command)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ struct xpt2046 *ts = dev_get_drvdata(dev);
+ struct dfr_req *req = kzalloc(sizeof *req, GFP_KERNEL);
+ int status;
+
+ if (!req)
+ return -ENOMEM;
+
+ spi_message_init(&req->msg);
+
+ /* take sample */
+ req->command = (u8) command;
+ req->xfer[0].tx_buf = &req->command;
+ req->xfer[0].len = 1;
+ spi_message_add_tail(&req->xfer[0], &req->msg);
+
+ req->xfer[1].rx_buf = &req->sample;
+ req->xfer[1].len = 2;
+ spi_message_add_tail(&req->xfer[1], &req->msg);
+
+ /* converter in low power mode & enable PENIRQ */
+ req->pwrdown= PWRDOWN;
+ req->xfer[2].tx_buf = &req->pwrdown;
+ req->xfer[2].len = 1;
+ spi_message_add_tail(&req->xfer[2], &req->msg);
+
+ req->xfer[3].rx_buf = &req->dummy;
+ req->xfer[3].len = 2;
+ CS_CHANGE(req->xfer[3]);
+ spi_message_add_tail(&req->xfer[3], &req->msg);
+
+ ts->irq_disabled = 1;
+ disable_irq(spi->irq);
+ status = spi_sync(spi, &req->msg);
+ ts->irq_disabled = 0;
+ enable_irq(spi->irq);
+
+ if (status == 0) {
+ /* on-wire is a must-ignore bit, a BE12 value, then padding */
+ status = be16_to_cpu(req->sample);
+ status = status >> 3;
+ status &= 0x0fff;
+ printk("***>%s:status=%d\n",__FUNCTION__,status);
+ }
+
+ kfree(req);
+ return status;
+}
+
+
+
+/*--------------------------------------------------------------------------*/
+
+static int get_pendown_state(struct xpt2046 *ts)
+{
+ if (ts->get_pendown_state)
+ return ts->get_pendown_state();
+
+ return !gpio_get_value(ts->gpio_pendown);
+}
+
+static void null_wait_for_sync(void)
+{
+
+}
+
+/*
+ * PENIRQ only kicks the timer. The timer only reissues the SPI transfer,
+ * to retrieve touchscreen status.
+ *
+ * The SPI transfer completion callback does the real work. It reports
+ * touchscreen events and reactivates the timer (or IRQ) as appropriate.
+ */
+
+static void xpt2046_rx(void *xpt)
+{
+ struct xpt2046 *ts = xpt;
+ struct xpt2046_packet *packet = ts->packet;
+ unsigned Rt = 1;
+ u16 x, y;
+
+ /* xpt2046_rx_val() did in-place conversion (including byteswap) from
+ * on-the-wire format as part of debouncing to get stable readings.
+ */
+ x = packet->tc.x;
+ y = packet->tc.y;
+ printk("***>%s:x=%d,y=%d\n",__FUNCTION__,x,y);
+ /* range filtering */
+ if (x == MAX_12BIT)
+ x = 0;
+
+ /* 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
+ */
+ if (packet->tc.ignore) {
+ printk("***>%s:ignored=%d\n",__FUNCTION__,packet->tc.ignore);
+ hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
+ HRTIMER_MODE_REL);
+ return;
+ }
+
+ /* Maybe check the pendown state before reporting. This discards
+ * false readings when the pen is lifted.
+ */
+ if (ts->penirq_recheck_delay_usecs) {
+ udelay(ts->penirq_recheck_delay_usecs);
+ if (!get_pendown_state(ts))
+ {
+ printk("***>%s:get_pendown_state(ts)==0,discard false reading\n",__FUNCTION__);
+ Rt = 0;
+ }
+ }
+
+ /* NOTE: We can't rely on the pressure to determine the pen down
+ * state, even 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
+ * timer by reading the pen signal state (it's a GPIO _and_ IRQ).
+ */
+ if (Rt) {
+ struct input_dev *input = ts->input;
+ if (!ts->pendown) {
+ input_report_key(input, BTN_TOUCH, 1);
+ ts->pendown = 1;
+ printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
+ }
+
+ x = AD_TO_X(x);
+ y = AD_TO_Y(y);
+
+ if (ts->swap_xy)
+ swap(x, y);
+
+ input_report_abs(input, ABS_X, x);
+ input_report_abs(input, ABS_Y, y);
+
+ input_sync(input);
+ printk("***>%s:input_report_abs(%4d/%4d)\n",__FUNCTION__,x, y);
+ }
+
+ hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
+ HRTIMER_MODE_REL);
+}
+
+static int xpt2046_debounce(void *xpt, int data_idx, int *val)
+{
+ struct xpt2046 *ts = xpt;
+ static int average_val[2];
+
+
+ printk("***>%s:%d,%d,%d,%d,%d,%d,%d,%d\n",__FUNCTION__,
+ data_idx,ts->last_read,
+ ts->read_cnt,ts->debounce_max,
+ abs(ts->last_read - *val),ts->debounce_tol,
+ ts->read_rep,ts->debounce_rep);
+
+ /* discard the first sample. */
+ if(!ts->read_cnt)
+ {
+ udelay(100);
+ ts->read_cnt++;
+ return XPT2046_FILTER_REPEAT;
+ }
+
+ if (ts->read_cnt==1 || (abs(ts->last_read - *val) > ts->debounce_tol)) {
+ /* Start over collecting consistent readings. */
+ ts->read_rep = 1;
+ average_val[data_idx] = *val;
+ /* Repeat it, if this was the first read or the read
+ * wasn't consistent enough. */
+ if (ts->read_cnt < ts->debounce_max) {
+ ts->last_read = *val;
+ ts->read_cnt++;
+ return XPT2046_FILTER_REPEAT;
+ } else {
+ /* Maximum number of debouncing reached and still
+ * not enough number of consistent readings. Abort
+ * the whole sample, repeat it in the next sampling
+ * period.
+ */
+ ts->read_cnt = 0;
+ ts->last_read = 0;
+ memset(average_val,0,sizeof(average_val));
+ printk("***>%s:XPT2046_FILTER_IGNORE\n",__FUNCTION__);
+ return XPT2046_FILTER_IGNORE;
+ }
+ }
+ else {
+ average_val[data_idx] += *val;
+
+ if (++ts->read_rep >= ts->debounce_rep) {
+ /* Got a good reading for this coordinate,
+ * go for the next one. */
+ ts->read_cnt = 0;
+ ts->read_rep = 0;
+ ts->last_read = 0;
+ *val = average_val[data_idx]/(ts->debounce_rep);
+ return XPT2046_FILTER_OK;
+ } else {
+ /* Read more values that are consistent. */
+ ts->read_cnt++;
+
+ return XPT2046_FILTER_REPEAT;
+ }
+ }
+}
+
+static int xpt2046_no_filter(void *xpt, int data_idx, int *val)
+{
+ return XPT2046_FILTER_OK;
+}
+
+static void xpt2046_rx_val(void *xpt)
+{
+ struct xpt2046 *ts = xpt;
+ struct xpt2046_packet *packet = ts->packet;
+ struct spi_message *m;
+ struct spi_transfer *t;
+ int val;
+ int action;
+ int status;
+
+ m = &ts->msg[ts->msg_idx];
+ t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
+
+ /* adjust: on-wire is a must-ignore bit, a BE12 value, then padding;
+ * built from two 8 bit values written msb-first.
+ */
+ val = (be16_to_cpup((__be16 *)t->rx_buf) >> 3) & 0x0fff;
+ printk("***>%s:value=%d\n",__FUNCTION__,val);
+ action = ts->filter(ts->filter_data, ts->msg_idx, &val);
+ switch (action) {
+ case XPT2046_FILTER_REPEAT:
+ break;
+ case XPT2046_FILTER_IGNORE:
+ packet->tc.ignore = 1;
+ /* Last message will contain xpt2046_rx() as the
+ * completion function.
+ */
+ m = ts->last_msg;
+ break;
+ case XPT2046_FILTER_OK:
+ *(u16 *)t->rx_buf = val;
+ packet->tc.ignore = 0;
+ m = &ts->msg[++ts->msg_idx];
+ break;
+ default:
+ BUG();
+ }
+ ts->wait_for_sync();
+ status = spi_async(ts->spi, m);
+ if (status)
+ dev_err(&ts->spi->dev, "spi_async --> %d\n",
+ status);
+}
+
+static enum hrtimer_restart xpt2046_timer(struct hrtimer *handle)
+{
+ struct xpt2046 *ts = container_of(handle, struct xpt2046, timer);
+ int status = 0;
+
+ spin_lock(&ts->lock);
+
+ if (unlikely(!get_pendown_state(ts) ||
+ device_suspended(&ts->spi->dev))) {
+ if (ts->pendown) {
+ struct input_dev *input = ts->input;
+ input_report_key(input, BTN_TOUCH, 0);
+ input_report_abs(input, ABS_PRESSURE, 0);
+ input_sync(input);
+
+ ts->pendown = 0;
+
+ printk("***>%s:input_report_key(The touchscreen up)\n",__FUNCTION__);
+ }
+
+ /* measurement cycle ended */
+ if (!device_suspended(&ts->spi->dev)) {
+ printk("***>%s:device_suspended==0\n",__FUNCTION__);
+ ts->irq_disabled = 0;
+ enable_irq(ts->spi->irq);
+ }
+ ts->pending = 0;
+ } else {
+ /* pen is still down, continue with the measurement */
+ printk("***>%s:pen is still down, continue with the measurement\n",__FUNCTION__);
+ ts->msg_idx = 0;
+ ts->wait_for_sync();
+ status = spi_async(ts->spi, &ts->msg[0]);
+ if (status)
+ dev_err(&ts->spi->dev, "spi_async --> %d\n", status);
+ }
+
+ spin_unlock(&ts->lock);
+ return HRTIMER_NORESTART;
+}
+
+static irqreturn_t xpt2046_irq(int irq, void *handle)
+{
+ struct xpt2046 *ts = handle;
+ unsigned long flags;
+
+ printk("***>%s.....%s.....%d\n",__FILE__,__FUNCTION__,__LINE__);
+
+ spin_lock_irqsave(&ts->lock, flags);
+
+ if (likely(get_pendown_state(ts))) {
+ if (!ts->irq_disabled) {
+ /* The ARM do_simple_IRQ() dispatcher doesn't act
+ * like the other dispatchers: it will report IRQs
+ * even after they've been disabled. We work around
+ * that here. (The "generic irq" framework may help...)
+ */
+ ts->irq_disabled = 1;
+ disable_irq_nosync(ts->spi->irq);
+ ts->pending = 1;
+ hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
+ HRTIMER_MODE_REL);
+ }
+ }
+ spin_unlock_irqrestore(&ts->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+/*--------------------------------------------------------------------------*/
+
+/* Must be called with ts->lock held */
+static void xpt2046_disable(struct xpt2046 *ts)
+{
+ if (ts->disabled)
+ return;
+
+ ts->disabled = 1;
+
+ /* are we waiting for IRQ, or polling? */
+ if (!ts->pending) {
+ ts->irq_disabled = 1;
+ disable_irq(ts->spi->irq);
+ } else {
+ /* the timer will run at least once more, and
+ * leave everything in a clean state, IRQ disabled
+ */
+ while (ts->pending) {
+ spin_unlock_irq(&ts->lock);
+ msleep(1);
+ spin_lock_irq(&ts->lock);
+ }
+ }
+
+ /* we know the chip's in lowpower mode since we always
+ * leave it that way after every request
+ */
+}
+
+/* Must be called with ts->lock held */
+static void xpt2046_enable(struct xpt2046 *ts)
+{
+ if (!ts->disabled)
+ return;
+
+ ts->disabled = 0;
+ ts->irq_disabled = 0;
+ enable_irq(ts->spi->irq);
+}
+
+static int xpt2046_suspend(struct spi_device *spi, pm_message_t message)
+{
+ struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
+
+ spin_lock_irq(&ts->lock);
+
+ ts->is_suspended = 1;
+ xpt2046_disable(ts);
+
+ spin_unlock_irq(&ts->lock);
+
+ return 0;
+
+}
+
+static int xpt2046_resume(struct spi_device *spi)
+{
+ struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
+
+ spin_lock_irq(&ts->lock);
+
+ ts->is_suspended = 0;
+ xpt2046_enable(ts);
+
+ spin_unlock_irq(&ts->lock);
+
+ return 0;
+}
+
+static int __devinit setup_pendown(struct spi_device *spi, struct xpt2046 *ts)
+{
+ struct xpt2046_platform_data *pdata = spi->dev.platform_data;
+ int err;
+
+ /* REVISIT when the irq can be triggered active-low, or if for some
+ * reason the touchscreen isn't hooked up, we don't need to access
+ * the pendown state.
+ */
+ if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) {
+ dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
+ return -EINVAL;
+ }
+
+ if (pdata->get_pendown_state) {
+ ts->get_pendown_state = pdata->get_pendown_state;
+ return 0;
+ }
+
+ err = gpio_request(pdata->gpio_pendown, "xpt2046_pendown");
+ if (err) {
+ dev_err(&spi->dev, "failed to request pendown GPIO%d\n",
+ pdata->gpio_pendown);
+ return err;
+ }
+
+ ts->gpio_pendown = pdata->gpio_pendown;
+ return 0;
+}
+
+static int __devinit xpt2046_probe(struct spi_device *spi)
+{
+ struct xpt2046 *ts;
+ struct xpt2046_packet *packet;
+ struct input_dev *input_dev;
+ struct xpt2046_platform_data *pdata = spi->dev.platform_data;
+ struct spi_message *m;
+ struct spi_transfer *x;
+ int vref;
+ int err;
+
+
+
+ if (!spi->irq) {
+ dev_dbg(&spi->dev, "no IRQ?\n");
+ return -ENODEV;
+ }
+ else{
+ spi->irq = gpio_to_irq(spi->irq);
+ dev_dbg(&spi->dev, "no IRQ?\n");
+ }
+
+ if (!pdata) {
+ spi->dev.platform_data = &xpt2046_info;
+ pdata = spi->dev.platform_data;
+ }
+
+ /* don't exceed max specified sample rate */
+ if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
+ dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
+ (spi->max_speed_hz/SAMPLE_BITS)/1000);
+ return -EINVAL;
+ }
+
+ /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except
+ * that even if the hardware can do that, the SPI controller driver
+ * may not. So we stick to very-portable 8 bit words, both RX and TX.
+ */
+ spi->bits_per_word = 8;
+ spi->mode = SPI_MODE_0;
+ err = spi_setup(spi);
+ if (err < 0)
+ return err;
+
+ ts = kzalloc(sizeof(struct xpt2046), GFP_KERNEL);
+ packet = kzalloc(sizeof(struct xpt2046_packet), GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (!ts || !packet || !input_dev) {
+ err = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ dev_set_drvdata(&spi->dev, ts);
+
+ ts->packet = packet;
+ ts->spi = spi;
+ ts->input = input_dev;
+ ts->swap_xy = pdata->swap_xy;
+
+ hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ ts->timer.function = xpt2046_timer;
+
+ spin_lock_init(&ts->lock);
+
+ ts->model = pdata->model ? : 2046;
+
+ if (pdata->filter != NULL) {
+ if (pdata->filter_init != NULL) {
+ err = pdata->filter_init(pdata, &ts->filter_data);
+ if (err < 0)
+ goto err_free_mem;
+ }
+ ts->filter = pdata->filter;
+ ts->filter_cleanup = pdata->filter_cleanup;
+ } else if (pdata->debounce_max) {
+ ts->debounce_max = pdata->debounce_max;
+ if (ts->debounce_max < DEBOUNCE_REPTIME)
+ ts->debounce_max = DEBOUNCE_REPTIME;
+ ts->debounce_tol = pdata->debounce_tol;
+ ts->debounce_rep = pdata->debounce_rep;
+ ts->filter = xpt2046_debounce;
+ ts->filter_data = ts;
+ } else
+ ts->filter = xpt2046_no_filter;
+
+ err = setup_pendown(spi, ts);
+ if (err)
+ goto err_cleanup_filter;
+
+ if (pdata->penirq_recheck_delay_usecs)
+ ts->penirq_recheck_delay_usecs =
+ pdata->penirq_recheck_delay_usecs;
+
+ ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
+
+ snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
+ snprintf(ts->name, sizeof(ts->name), "XPT%d Touchscreen", ts->model);
+
+ input_dev->name = ts->name;
+ input_dev->phys = ts->phys;
+ input_dev->dev.parent = &spi->dev;
+
+ 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,
+ 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);
+
+ vref = pdata->keep_vref_on;
+
+ /* set up the transfers to read touchscreen state; this assumes we
+ * use formula #2 for pressure, not #3.
+ */
+ m = &ts->msg[0];
+ x = ts->xfer;
+
+ spi_message_init(m);
+
+ /* y- still on; turn on only y+ (and ADC) */
+ packet->read_y = READ_Y(vref);
+ x->tx_buf = &packet->read_y;
+ x->len = 1;
+ spi_message_add_tail(x, m);
+
+ x++;
+ x->rx_buf = &packet->tc.y;
+ x->len = 2;
+ spi_message_add_tail(x, m);
+
+ m->complete = xpt2046_rx_val;
+ m->context = ts;
+
+ m++;
+ spi_message_init(m);
+
+ /* turn y- off, x+ on, then leave in lowpower */
+ x++;
+ packet->read_x = READ_X(vref);
+ x->tx_buf = &packet->read_x;
+ x->len = 1;
+ spi_message_add_tail(x, m);
+
+ x++;
+ x->rx_buf = &packet->tc.x;
+ x->len = 2;
+ spi_message_add_tail(x, m);
+
+ m->complete = xpt2046_rx_val;
+ m->context = ts;
+
+ /* power down */
+ m++;
+ spi_message_init(m);
+
+ x++;
+ packet->pwrdown = PWRDOWN;
+ x->tx_buf = &packet->pwrdown;
+ x->len = 1;
+ spi_message_add_tail(x, m);
+
+ x++;
+ x->rx_buf = &packet->dummy;
+ x->len = 2;
+ CS_CHANGE(*x);
+ spi_message_add_tail(x, m);
+
+ m->complete = xpt2046_rx;
+ m->context = ts;
+
+ ts->last_msg = m;
+
+ if (request_irq(spi->irq, xpt2046_irq, IRQF_TRIGGER_FALLING,
+ spi->dev.driver->name, ts)) {
+ printk("***>%s:trying pin change workaround on irq %d\n",__FUNCTION__,spi->irq);
+ err = request_irq(spi->irq, xpt2046_irq,
+ IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+ spi->dev.driver->name, ts);
+ if (err) {
+ dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
+ goto err_free_gpio;
+ }
+ }
+ printk("***>%s:touchscreen irq %d\n",__FUNCTION__,spi->irq);
+
+ /* take a first sample, leaving nPENIRQ active and vREF off; avoid
+ * the touchscreen, in case it's not connected.
+ */
+ xpt2046_read12_dfr(&spi->dev,READ_X(1));
+
+ err = input_register_device(input_dev);
+ if (err)
+ goto err_remove_attr_group;
+
+ return 0;
+
+ err_remove_attr_group:
+ free_irq(spi->irq, ts);
+ err_free_gpio:
+ if (ts->gpio_pendown != -1)
+ gpio_free(ts->gpio_pendown);
+ err_cleanup_filter:
+ if (ts->filter_cleanup)
+ ts->filter_cleanup(ts->filter_data);
+ err_free_mem:
+ input_free_device(input_dev);
+ kfree(packet);
+ kfree(ts);
+ return err;
+}
+
+static int __devexit xpt2046_remove(struct spi_device *spi)
+{
+ struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
+
+ input_unregister_device(ts->input);
+
+ xpt2046_suspend(spi, PMSG_SUSPEND);
+
+ free_irq(ts->spi->irq, ts);
+ /* suspend left the IRQ disabled */
+ enable_irq(ts->spi->irq);
+
+ if (ts->gpio_pendown != -1)
+ gpio_free(ts->gpio_pendown);
+
+ if (ts->filter_cleanup)
+ ts->filter_cleanup(ts->filter_data);
+
+ kfree(ts->packet);
+ kfree(ts);
+
+ dev_dbg(&spi->dev, "unregistered touchscreen\n");
+ return 0;
+}
+
+static struct spi_driver xpt2046_driver = {
+ .driver = {
+ .name = "xpt2046_ts",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = xpt2046_probe,
+ .remove = __devexit_p(xpt2046_remove),
+ .suspend = xpt2046_suspend,
+ .resume = xpt2046_resume,
+};
+
+static int __init xpt2046_init(void)
+{
+ return spi_register_driver(&xpt2046_driver);
+}
+module_init(xpt2046_init);
+
+static void __exit xpt2046_exit(void)
+{
+ spi_unregister_driver(&xpt2046_driver);
+}
+module_exit(xpt2046_exit);
+
+MODULE_DESCRIPTION("rk2818 spi xpt2046 TouchScreen Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("spi:xpt2046");
projects / firefly-linux-kernel-4.4.55.git / commitdiff