From 8ee35e6000459e6b38fe3600d2e5e6370aa414e3 Mon Sep 17 00:00:00 2001 From: =?utf8?q?=E6=B2=88=E7=9D=BF=E6=B1=80?= Date: Tue, 18 May 2010 12:31:18 +0000 Subject: [PATCH] update for xpt2046 --- drivers/input/touchscreen/Kconfig | 14 +- drivers/input/touchscreen/Makefile | 4 +- drivers/input/touchscreen/xpt2046_ts.c | 928 +++++++++++++++++++++++++ drivers/input/touchscreen/xpt2046_ts.h | 54 ++ 4 files changed, 991 insertions(+), 9 deletions(-) create mode 100644 drivers/input/touchscreen/xpt2046_ts.c create mode 100644 drivers/input/touchscreen/xpt2046_ts.h diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index 855dbf97cc9f..6451be2cf6d2 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -42,9 +42,9 @@ config TOUCHSCREEN_AD7877 To compile this driver as a module, choose M here: the module will be called ad7877. -config TOUCHSCREEN_RK2818_SPI_XPT2046 - tristate "RK2818 SPI XPT2046 based touchscreens" - depends on SPIM_RK2818 && TOUCHSCREEN_RK2818_SPI_XPT2046_CBN = n +config TOUCHSCREEN_XPT2046_SPI + tristate "XPT2046 based touchscreens: XPT2046 SPI Interface" + depends on SPIM_RK2818 && TOUCHSCREEN_XPT2046_CBN_SPI = n help Say Y here if you have a touchscreen interface using the xpt2046 controller, and your board-specific initialization @@ -53,10 +53,10 @@ config TOUCHSCREEN_RK2818_SPI_XPT2046 If unsure, say N (but it's safe to say "Y"). To compile this driver as a module, choose M here: the - module will be called rk2818_spi_xpt2046_ts. + module will be called xpt2046_ts. -config TOUCHSCREEN_RK2818_SPI_XPT2046_CBN - tristate "RK2818 SPI XPT2046 CALIBRATION based touchscreens" +config TOUCHSCREEN_XPT2046_CBN_SPI + tristate "XPT2046 CALIBRATION based touchscreens: XPT2046 SPI Interface" depends on SPIM_RK2818 help Say Y here if you have a touchscreen interface using the @@ -66,7 +66,7 @@ config TOUCHSCREEN_RK2818_SPI_XPT2046_CBN If unsure, say N (but it's safe to say "Y"). To compile this driver as a module, choose M here: the - module will be called rk2818_spi_xpt2046_cbn_ts. + module will be called xpt2046_cbn_ts. config TOUCHSCREEN_AD7879_I2C tristate "AD7879 based touchscreens: AD7879-1 I2C Interface" diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 3dfca169983a..887cbbe07b35 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -43,5 +43,5 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE) += zylonite-wm97xx.o obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o obj-$(CONFIG_TOUCHSCREEN_PCAP) += pcap_ts.o -obj-$(CONFIG_TOUCHSCREEN_RK2818_SPI_XPT2046) += rk2818_spi_xpt2046_ts.o -obj-$(CONFIG_TOUCHSCREEN_RK2818_SPI_XPT2046_CBN) += rk2818_spi_xpt2046_cbn_ts.o rk2818_calibration_ts.o rk2818_largenum_ts.o \ No newline at end of file +obj-$(CONFIG_TOUCHSCREEN_XPT2046_SPI) += xpt2046_ts.o +obj-$(CONFIG_TOUCHSCREEN_XPT2046_CBN_SPI) += xpt2046_cbn_ts.o calibration_ts.o largenum_ts.o \ No newline at end of file diff --git a/drivers/input/touchscreen/xpt2046_ts.c b/drivers/input/touchscreen/xpt2046_ts.c new file mode 100644 index 000000000000..533a7342c148 --- /dev/null +++ b/drivers/input/touchscreen/xpt2046_ts.c @@ -0,0 +1,928 @@ +/* + * drivers/input/touchscreen/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 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "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 XPT2046_DEBUG 0 +#if XPT2046_DEBUG + #define xpt2046printk(msg...) printk(msg); +#else + #define xpt2046printk(msg...) +#endif +#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; + + xpt2046printk("***>%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) { + + xpt2046printk("***>%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); + xpt2046printk("***>%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]; + + + xpt2046printk("***>%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)); + xpt2046printk("***>%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; + + xpt2046printk("***>%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_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 */ + xpt2046printk("***>%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; + + xpt2046printk("***>%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"); diff --git a/drivers/input/touchscreen/xpt2046_ts.h b/drivers/input/touchscreen/xpt2046_ts.h new file mode 100644 index 000000000000..a805c82c7c9c --- /dev/null +++ b/drivers/input/touchscreen/xpt2046_ts.h @@ -0,0 +1,54 @@ +/* + * drivers/input/touchscreen/xpt2046_ts.h + * + * 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. + */ + +#ifndef __DRIVERS_TOUCHSCREEN_XPT2046_TS_H +#define __DRIVERS_TOUCHSCREEN_XPT2046_TS_H +enum xpt2046_filter { + XPT2046_FILTER_OK, + XPT2046_FILTER_REPEAT, + XPT2046_FILTER_IGNORE, +}; + +struct xpt2046_platform_data { + u16 model; /* 2046. */ + bool keep_vref_on; /* set to keep vref on for differential + * measurements as well */ + bool swap_xy; /* swap x and y axes */ + + /* If set to non-zero, after samples are taken this delay is applied + * and penirq is rechecked, to help avoid false events. This value + * is affected by the material used to build the touch layer. + */ + u16 penirq_recheck_delay_usecs; + + u16 x_min, x_max; + u16 y_min, y_max; + + u16 debounce_max; /* max number of additional readings + * per sample */ + u16 debounce_tol; /* tolerance used for filtering */ + u16 debounce_rep; /* additional consecutive good readings + * required after the first two */ + int gpio_pendown; /* the GPIO used to decide the pendown + * state if get_pendown_state == NULL + */ + int (*get_pendown_state)(void); + int (*filter_init) (struct xpt2046_platform_data *pdata, + void **filter_data); + int (*filter) (void *filter_data, int data_idx, int *val); + void (*filter_cleanup)(void *filter_data); + void (*wait_for_sync)(void); +}; +#endif -- 2.34.1