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Input: add AD7879 Touchscreen driver
[randy.dunlap@oracle.com: don't use bus_id] [dtor@mail.ru: locking and other fixups] Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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4 changed files with 850 additions and 0 deletions
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@ -42,6 +42,38 @@ config TOUCHSCREEN_AD7877
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To compile this driver as a module, choose M here: the
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module will be called ad7877.
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config TOUCHSCREEN_AD7879_I2C
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tristate "AD7879 based touchscreens: AD7879-1 I2C Interface"
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depends on I2C
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select TOUCHSCREEN_AD7879
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help
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Say Y here if you have a touchscreen interface using the
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AD7879-1 controller, and your board-specific initialization
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code includes that in its table of I2C devices.
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If unsure, say N (but it's safe to say "Y").
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To compile this driver as a module, choose M here: the
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module will be called ad7879.
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config TOUCHSCREEN_AD7879_SPI
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tristate "AD7879 based touchscreens: AD7879 SPI Interface"
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depends on SPI_MASTER && TOUCHSCREEN_AD7879_I2C = n
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select TOUCHSCREEN_AD7879
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help
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Say Y here if you have a touchscreen interface using the
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AD7879 controller, and your board-specific initialization
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code includes that in its table of SPI devices.
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If unsure, say N (but it's safe to say "Y").
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To compile this driver as a module, choose M here: the
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module will be called ad7879.
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config TOUCHSCREEN_AD7879
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tristate
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default n
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config TOUCHSCREEN_BITSY
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tristate "Compaq iPAQ H3600 (Bitsy) touchscreen"
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depends on SA1100_BITSY
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@ -7,6 +7,7 @@
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wm97xx-ts-y := wm97xx-core.o
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obj-$(CONFIG_TOUCHSCREEN_AD7877) += ad7877.o
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obj-$(CONFIG_TOUCHSCREEN_AD7879) += ad7879.o
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obj-$(CONFIG_TOUCHSCREEN_ADS7846) += ads7846.o
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obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC) += atmel_tsadcc.o
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obj-$(CONFIG_TOUCHSCREEN_BITSY) += h3600_ts_input.o
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782
drivers/input/touchscreen/ad7879.c
Normal file
782
drivers/input/touchscreen/ad7879.c
Normal file
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@ -0,0 +1,782 @@
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/*
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* Copyright (C) 2008 Michael Hennerich, Analog Devices Inc.
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*
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* Description: AD7879 based touchscreen, and GPIO driver (I2C/SPI Interface)
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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/init.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/slab.h>
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#include <linux/workqueue.h>
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#include <linux/spi/spi.h>
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#include <linux/i2c.h>
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#include <linux/spi/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_XPOS = 0,
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AD7879_SEQ_YPOS = 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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#if defined(CONFIG_TOUCHSCREEN_AD7879_SPI) || defined(CONFIG_TOUCHSCREEN_AD7879_SPI_MODULE)
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#define AD7879_DEVID 0x7A
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typedef struct spi_device bus_device;
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#elif defined(CONFIG_TOUCHSCREEN_AD7879_I2C) || defined(CONFIG_TOUCHSCREEN_AD7879_I2C_MODULE)
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#define AD7879_DEVID 0x79
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typedef struct i2c_client bus_device;
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#endif
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struct ad7879 {
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bus_device *bus;
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struct input_dev *input;
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struct work_struct work;
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struct timer_list timer;
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struct mutex mutex;
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unsigned disabled:1; /* P: mutex */
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#if defined(CONFIG_TOUCHSCREEN_AD7879_SPI) || defined(CONFIG_TOUCHSCREEN_AD7879_SPI_MODULE)
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struct spi_message msg;
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struct spi_transfer xfer[AD7879_NR_SENSE + 1];
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u16 cmd;
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#endif
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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 pressure_max;
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u16 gpio_init;
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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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unsigned gpio:1;
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};
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static int ad7879_read(bus_device *, u8);
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static int ad7879_write(bus_device *, u8, u16);
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static void ad7879_collect(struct ad7879 *);
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static void 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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/*
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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 filter.
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* The combination of these two techniques provides a robust solution,
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* discarding the spurious noise in the signal and keeping only the data of interest.
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* The size of both filters is programmable. (dev.platform_data, see linux/spi/ad7879.h)
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* Other user-programmable conversion controls include variable acquisition time,
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* and first conversion delay. Up to 16 averages can 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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input_report_abs(input_dev, ABS_X, x);
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input_report_abs(input_dev, ABS_Y, y);
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input_report_abs(input_dev, ABS_PRESSURE, Rt);
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input_sync(input_dev);
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}
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}
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static void ad7879_work(struct work_struct *work)
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{
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struct ad7879 *ts = container_of(work, struct ad7879, work);
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/* use keventd context to read the result registers */
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ad7879_collect(ts);
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ad7879_report(ts);
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mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
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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_sync(input_dev);
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}
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static void ad7879_timer(unsigned long handle)
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{
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struct ad7879 *ts = (void *)handle;
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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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/* The repeated conversion sequencer controlled by TMR kicked off too fast.
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* We ignore the last and process the sample sequence currently in the queue.
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* It can't be older than 9.4ms
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*/
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if (!work_pending(&ts->work))
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schedule_work(&ts->work);
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return IRQ_HANDLED;
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}
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static void ad7879_setup(struct ad7879 *ts)
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{
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ts->cmd_crtl3 = AD7879_YPLUS_BIT |
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AD7879_XPLUS_BIT |
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AD7879_Z2_BIT |
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AD7879_Z1_BIT |
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AD7879_TEMPMASK_BIT |
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AD7879_AUXVBATMASK_BIT |
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AD7879_GPIOALERTMASK_BIT;
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ts->cmd_crtl2 = AD7879_PM(AD7879_PM_DYN) | AD7879_DFR |
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AD7879_AVG(ts->averaging) |
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AD7879_MFS(ts->median) |
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AD7879_FCD(ts->first_conversion_delay) |
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ts->gpio_init;
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ts->cmd_crtl1 = AD7879_MODE_INT | AD7879_MODE_SEQ1 |
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AD7879_ACQ(ts->acquisition_time) |
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AD7879_TMR(ts->pen_down_acc_interval);
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ad7879_write(ts->bus, AD7879_REG_CTRL2, ts->cmd_crtl2);
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ad7879_write(ts->bus, AD7879_REG_CTRL3, ts->cmd_crtl3);
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ad7879_write(ts->bus, AD7879_REG_CTRL1, ts->cmd_crtl1);
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}
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static void ad7879_disable(struct ad7879 *ts)
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{
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mutex_lock(&ts->mutex);
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if (!ts->disabled) {
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ts->disabled = 1;
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disable_irq(ts->bus->irq);
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cancel_work_sync(&ts->work);
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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->bus, AD7879_REG_CTRL2,
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AD7879_PM(AD7879_PM_SHUTDOWN));
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}
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mutex_unlock(&ts->mutex);
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}
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static void ad7879_enable(struct ad7879 *ts)
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{
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mutex_lock(&ts->mutex);
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if (ts->disabled) {
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ad7879_setup(ts);
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ts->disabled = 0;
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enable_irq(ts->bus->irq);
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}
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mutex_unlock(&ts->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 long val;
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int error;
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error = strict_strtoul(buf, 10, &val);
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if (error)
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return error;
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if (val)
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ad7879_disable(ts);
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else
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ad7879_enable(ts);
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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 ssize_t ad7879_gpio_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->gpio);
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}
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static ssize_t ad7879_gpio_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 long val;
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int error;
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error = strict_strtoul(buf, 10, &val);
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if (error)
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return error;
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mutex_lock(&ts->mutex);
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ts->gpio = !!val;
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error = ad7879_write(ts->bus, AD7879_REG_CTRL2,
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ts->gpio ?
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ts->cmd_crtl2 & ~AD7879_GPIO_DATA :
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ts->cmd_crtl2 | AD7879_GPIO_DATA);
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mutex_unlock(&ts->mutex);
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return error ? : count;
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}
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static DEVICE_ATTR(gpio, 0664, ad7879_gpio_show, ad7879_gpio_store);
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static struct attribute *ad7879_attributes[] = {
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&dev_attr_disable.attr,
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&dev_attr_gpio.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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static int __devinit ad7879_construct(bus_device *bus, struct ad7879 *ts)
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{
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struct input_dev *input_dev;
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struct ad7879_platform_data *pdata = bus->dev.platform_data;
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int err;
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u16 revid;
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if (!bus->irq) {
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dev_err(&bus->dev, "no IRQ?\n");
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return -ENODEV;
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}
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if (!pdata) {
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dev_err(&bus->dev, "no platform data?\n");
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return -ENODEV;
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}
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input_dev = input_allocate_device();
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if (!input_dev)
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return -ENOMEM;
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ts->input = input_dev;
|
||||
|
||||
setup_timer(&ts->timer, ad7879_timer, (unsigned long) ts);
|
||||
INIT_WORK(&ts->work, ad7879_work);
|
||||
mutex_init(&ts->mutex);
|
||||
|
||||
ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
|
||||
ts->pressure_max = pdata->pressure_max ? : ~0;
|
||||
|
||||
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;
|
||||
|
||||
if (pdata->gpio_output)
|
||||
ts->gpio_init = AD7879_GPIO_EN |
|
||||
(pdata->gpio_default ? 0 : AD7879_GPIO_DATA);
|
||||
else
|
||||
ts->gpio_init = AD7879_GPIO_EN | AD7879_GPIODIR;
|
||||
|
||||
snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&bus->dev));
|
||||
|
||||
input_dev->name = "AD7879 Touchscreen";
|
||||
input_dev->phys = ts->phys;
|
||||
input_dev->dev.parent = &bus->dev;
|
||||
|
||||
__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);
|
||||
|
||||
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);
|
||||
|
||||
err = ad7879_write(bus, AD7879_REG_CTRL2, AD7879_RESET);
|
||||
|
||||
if (err < 0) {
|
||||
dev_err(&bus->dev, "Failed to write %s\n", input_dev->name);
|
||||
goto err_free_mem;
|
||||
}
|
||||
|
||||
revid = ad7879_read(bus, AD7879_REG_REVID);
|
||||
|
||||
if ((revid & 0xFF) != AD7879_DEVID) {
|
||||
dev_err(&bus->dev, "Failed to probe %s\n", input_dev->name);
|
||||
err = -ENODEV;
|
||||
goto err_free_mem;
|
||||
}
|
||||
|
||||
ad7879_setup(ts);
|
||||
|
||||
err = request_irq(bus->irq, ad7879_irq,
|
||||
IRQF_TRIGGER_FALLING | IRQF_SAMPLE_RANDOM,
|
||||
bus->dev.driver->name, ts);
|
||||
|
||||
if (err) {
|
||||
dev_err(&bus->dev, "irq %d busy?\n", bus->irq);
|
||||
goto err_free_mem;
|
||||
}
|
||||
|
||||
err = sysfs_create_group(&bus->dev.kobj, &ad7879_attr_group);
|
||||
if (err)
|
||||
goto err_free_irq;
|
||||
|
||||
err = input_register_device(input_dev);
|
||||
if (err)
|
||||
goto err_remove_attr;
|
||||
|
||||
dev_info(&bus->dev, "Rev.%d touchscreen, irq %d\n",
|
||||
revid >> 8, bus->irq);
|
||||
|
||||
return 0;
|
||||
|
||||
err_remove_attr:
|
||||
sysfs_remove_group(&bus->dev.kobj, &ad7879_attr_group);
|
||||
err_free_irq:
|
||||
free_irq(bus->irq, ts);
|
||||
err_free_mem:
|
||||
input_free_device(input_dev);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __devexit ad7879_destroy(bus_device *bus, struct ad7879 *ts)
|
||||
{
|
||||
ad7879_disable(ts);
|
||||
sysfs_remove_group(&ts->bus->dev.kobj, &ad7879_attr_group);
|
||||
free_irq(ts->bus->irq, ts);
|
||||
input_unregister_device(ts->input);
|
||||
dev_dbg(&bus->dev, "unregistered touchscreen\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
static int ad7879_suspend(bus_device *bus, pm_message_t message)
|
||||
{
|
||||
struct ad7879 *ts = dev_get_drvdata(&bus->dev);
|
||||
|
||||
ad7879_disable(ts);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ad7879_resume(bus_device *bus)
|
||||
{
|
||||
struct ad7879 *ts = dev_get_drvdata(&bus->dev);
|
||||
|
||||
ad7879_enable(ts);
|
||||
|
||||
return 0;
|
||||
}
|
||||
#else
|
||||
#define ad7879_suspend NULL
|
||||
#define ad7879_resume NULL
|
||||
#endif
|
||||
|
||||
#if defined(CONFIG_TOUCHSCREEN_AD7879_SPI) || defined(CONFIG_TOUCHSCREEN_AD7879_SPI_MODULE)
|
||||
#define MAX_SPI_FREQ_HZ 5000000
|
||||
#define AD7879_CMD_MAGIC 0xE000
|
||||
#define AD7879_CMD_READ (1 << 10)
|
||||
#define AD7879_WRITECMD(reg) (AD7879_CMD_MAGIC | (reg & 0xF))
|
||||
#define AD7879_READCMD(reg) (AD7879_CMD_MAGIC | AD7879_CMD_READ | (reg & 0xF))
|
||||
|
||||
struct ser_req {
|
||||
u16 command;
|
||||
u16 data;
|
||||
struct spi_message msg;
|
||||
struct spi_transfer xfer[2];
|
||||
};
|
||||
|
||||
/*
|
||||
* ad7879_read/write are only used for initial setup and for sysfs controls.
|
||||
* The main traffic is done in ad7879_collect().
|
||||
*/
|
||||
|
||||
static int ad7879_read(struct spi_device *spi, u8 reg)
|
||||
{
|
||||
struct ser_req *req;
|
||||
int status, ret;
|
||||
|
||||
req = kzalloc(sizeof *req, GFP_KERNEL);
|
||||
if (!req)
|
||||
return -ENOMEM;
|
||||
|
||||
spi_message_init(&req->msg);
|
||||
|
||||
req->command = (u16) AD7879_READCMD(reg);
|
||||
req->xfer[0].tx_buf = &req->command;
|
||||
req->xfer[0].len = 2;
|
||||
|
||||
req->xfer[1].rx_buf = &req->data;
|
||||
req->xfer[1].len = 2;
|
||||
|
||||
spi_message_add_tail(&req->xfer[0], &req->msg);
|
||||
spi_message_add_tail(&req->xfer[1], &req->msg);
|
||||
|
||||
status = spi_sync(spi, &req->msg);
|
||||
ret = status ? : req->data;
|
||||
|
||||
kfree(req);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int ad7879_write(struct spi_device *spi, u8 reg, u16 val)
|
||||
{
|
||||
struct ser_req *req;
|
||||
int status;
|
||||
|
||||
req = kzalloc(sizeof *req, GFP_KERNEL);
|
||||
if (!req)
|
||||
return -ENOMEM;
|
||||
|
||||
spi_message_init(&req->msg);
|
||||
|
||||
req->command = (u16) AD7879_WRITECMD(reg);
|
||||
req->xfer[0].tx_buf = &req->command;
|
||||
req->xfer[0].len = 2;
|
||||
|
||||
req->data = val;
|
||||
req->xfer[1].tx_buf = &req->data;
|
||||
req->xfer[1].len = 2;
|
||||
|
||||
spi_message_add_tail(&req->xfer[0], &req->msg);
|
||||
spi_message_add_tail(&req->xfer[1], &req->msg);
|
||||
|
||||
status = spi_sync(spi, &req->msg);
|
||||
|
||||
kfree(req);
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
static void ad7879_collect(struct ad7879 *ts)
|
||||
{
|
||||
int status = spi_sync(ts->bus, &ts->msg);
|
||||
|
||||
if (status)
|
||||
dev_err(&ts->bus->dev, "spi_sync --> %d\n", status);
|
||||
}
|
||||
|
||||
static void ad7879_setup_ts_def_msg(struct ad7879 *ts)
|
||||
{
|
||||
struct spi_message *m;
|
||||
int i;
|
||||
|
||||
ts->cmd = (u16) AD7879_READCMD(AD7879_REG_XPLUS);
|
||||
|
||||
m = &ts->msg;
|
||||
spi_message_init(m);
|
||||
ts->xfer[0].tx_buf = &ts->cmd;
|
||||
ts->xfer[0].len = 2;
|
||||
|
||||
spi_message_add_tail(&ts->xfer[0], m);
|
||||
|
||||
for (i = 0; i < AD7879_NR_SENSE; i++) {
|
||||
ts->xfer[i + 1].rx_buf = &ts->conversion_data[i];
|
||||
ts->xfer[i + 1].len = 2;
|
||||
spi_message_add_tail(&ts->xfer[i + 1], m);
|
||||
}
|
||||
}
|
||||
|
||||
static int __devinit ad7879_probe(struct spi_device *spi)
|
||||
{
|
||||
struct ad7879 *ts;
|
||||
int error;
|
||||
|
||||
/* don't exceed max specified SPI CLK frequency */
|
||||
if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
|
||||
dev_err(&spi->dev, "SPI CLK %d Hz?\n", spi->max_speed_hz);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ts = kzalloc(sizeof(struct ad7879), GFP_KERNEL);
|
||||
if (!ts)
|
||||
return -ENOMEM;
|
||||
|
||||
dev_set_drvdata(&spi->dev, ts);
|
||||
ts->bus = spi;
|
||||
|
||||
ad7879_setup_ts_def_msg(ts);
|
||||
|
||||
error = ad7879_construct(spi, ts);
|
||||
if (error) {
|
||||
dev_set_drvdata(&spi->dev, NULL);
|
||||
kfree(ts);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __devexit ad7879_remove(struct spi_device *spi)
|
||||
{
|
||||
struct ad7879 *ts = dev_get_drvdata(&spi->dev);
|
||||
|
||||
ad7879_destroy(spi, ts);
|
||||
dev_set_drvdata(&spi->dev, NULL);
|
||||
kfree(ts);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct spi_driver ad7879_driver = {
|
||||
.driver = {
|
||||
.name = "ad7879",
|
||||
.bus = &spi_bus_type,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = ad7879_probe,
|
||||
.remove = __devexit_p(ad7879_remove),
|
||||
.suspend = ad7879_suspend,
|
||||
.resume = ad7879_resume,
|
||||
};
|
||||
|
||||
static int __init ad7879_init(void)
|
||||
{
|
||||
return spi_register_driver(&ad7879_driver);
|
||||
}
|
||||
module_init(ad7879_init);
|
||||
|
||||
static void __exit ad7879_exit(void)
|
||||
{
|
||||
spi_unregister_driver(&ad7879_driver);
|
||||
}
|
||||
module_exit(ad7879_exit);
|
||||
|
||||
#elif defined(CONFIG_TOUCHSCREEN_AD7879_I2C) || defined(CONFIG_TOUCHSCREEN_AD7879_I2C_MODULE)
|
||||
|
||||
/* All registers are word-sized.
|
||||
* AD7879 uses a high-byte first convention.
|
||||
*/
|
||||
static int ad7879_read(struct i2c_client *client, u8 reg)
|
||||
{
|
||||
return swab16(i2c_smbus_read_word_data(client, reg));
|
||||
}
|
||||
|
||||
static int ad7879_write(struct i2c_client *client, u8 reg, u16 val)
|
||||
{
|
||||
return i2c_smbus_write_word_data(client, reg, swab16(val));
|
||||
}
|
||||
|
||||
static void ad7879_collect(struct ad7879 *ts)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < AD7879_NR_SENSE; i++)
|
||||
ts->conversion_data[i] = ad7879_read(ts->bus,
|
||||
AD7879_REG_XPLUS + i);
|
||||
}
|
||||
|
||||
static int __devinit ad7879_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct ad7879 *ts;
|
||||
int error;
|
||||
|
||||
if (!i2c_check_functionality(client->adapter,
|
||||
I2C_FUNC_SMBUS_WORD_DATA)) {
|
||||
dev_err(&client->dev, "SMBUS Word Data not Supported\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
ts = kzalloc(sizeof(struct ad7879), GFP_KERNEL);
|
||||
if (!ts)
|
||||
return -ENOMEM;
|
||||
|
||||
i2c_set_clientdata(client, ts);
|
||||
ts->bus = client;
|
||||
|
||||
error = ad7879_construct(client, ts);
|
||||
if (error) {
|
||||
i2c_set_clientdata(client, NULL);
|
||||
kfree(ts);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __devexit ad7879_remove(struct i2c_client *client)
|
||||
{
|
||||
struct ad7879 *ts = dev_get_drvdata(&client->dev);
|
||||
|
||||
ad7879_destroy(client, ts);
|
||||
i2c_set_clientdata(client, NULL);
|
||||
kfree(ts);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id ad7879_id[] = {
|
||||
{ "ad7879", 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, ad7879_id);
|
||||
|
||||
static struct i2c_driver ad7879_driver = {
|
||||
.driver = {
|
||||
.name = "ad7879",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = ad7879_probe,
|
||||
.remove = __devexit_p(ad7879_remove),
|
||||
.suspend = ad7879_suspend,
|
||||
.resume = ad7879_resume,
|
||||
.id_table = ad7879_id,
|
||||
};
|
||||
|
||||
static int __init ad7879_init(void)
|
||||
{
|
||||
return i2c_add_driver(&ad7879_driver);
|
||||
}
|
||||
module_init(ad7879_init);
|
||||
|
||||
static void __exit ad7879_exit(void)
|
||||
{
|
||||
i2c_del_driver(&ad7879_driver);
|
||||
}
|
||||
module_exit(ad7879_exit);
|
||||
#endif
|
||||
|
||||
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
|
||||
MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver");
|
||||
MODULE_LICENSE("GPL");
|
35
include/linux/spi/ad7879.h
Normal file
35
include/linux/spi/ad7879.h
Normal file
|
@ -0,0 +1,35 @@
|
|||
/* linux/spi/ad7879.h */
|
||||
|
||||
/* Touchscreen characteristics vary between boards and models. The
|
||||
* platform_data for the device's "struct device" holds this information.
|
||||
*
|
||||
* It's OK if the min/max values are zero.
|
||||
*/
|
||||
struct ad7879_platform_data {
|
||||
u16 model; /* 7879 */
|
||||
u16 x_plate_ohms;
|
||||
u16 x_min, x_max;
|
||||
u16 y_min, y_max;
|
||||
u16 pressure_min, pressure_max;
|
||||
|
||||
/* [0..255] 0=OFF Starts at 1=550us and goes
|
||||
* all the way to 9.440ms in steps of 35us.
|
||||
*/
|
||||
u8 pen_down_acc_interval;
|
||||
/* [0..15] Starts at 0=128us and goes all the
|
||||
* way to 4.096ms in steps of 128us.
|
||||
*/
|
||||
u8 first_conversion_delay;
|
||||
/* [0..3] 0 = 2us, 1 = 4us, 2 = 8us, 3 = 16us */
|
||||
u8 acquisition_time;
|
||||
/* [0..3] Average X middle samples 0 = 2, 1 = 4, 2 = 8, 3 = 16 */
|
||||
u8 averaging;
|
||||
/* [0..3] Perform X measurements 0 = OFF,
|
||||
* 1 = 4, 2 = 8, 3 = 16 (median > averaging)
|
||||
*/
|
||||
u8 median;
|
||||
/* 1 = AUX/VBAT/GPIO set to GPIO Output */
|
||||
u8 gpio_output;
|
||||
/* Initial GPIO pin state (valid if gpio_output = 1) */
|
||||
u8 gpio_default;
|
||||
};
|
Loading…
Reference in a new issue