![Andrew F. Davis](/assets/img/avatar_default.png)
An spi_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Andrew F. Davis <afd@ti.com> Acked-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Mark Brown <broonie@kernel.org>
858 lines
21 KiB
C
858 lines
21 KiB
C
/*
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* Copyright (C) 2006-2008 Michael Hennerich, Analog Devices Inc.
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*
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* Description: AD7877 based touchscreen, sensor (ADCs), DAC and GPIO driver
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* Based on: ads7846.c
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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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*/
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/pm.h>
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/ad7877.h>
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#include <linux/module.h>
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#include <asm/irq.h>
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#define TS_PEN_UP_TIMEOUT msecs_to_jiffies(100)
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#define MAX_SPI_FREQ_HZ 20000000
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#define MAX_12BIT ((1<<12)-1)
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#define AD7877_REG_ZEROS 0
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#define AD7877_REG_CTRL1 1
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#define AD7877_REG_CTRL2 2
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#define AD7877_REG_ALERT 3
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#define AD7877_REG_AUX1HIGH 4
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#define AD7877_REG_AUX1LOW 5
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#define AD7877_REG_BAT1HIGH 6
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#define AD7877_REG_BAT1LOW 7
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#define AD7877_REG_BAT2HIGH 8
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#define AD7877_REG_BAT2LOW 9
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#define AD7877_REG_TEMP1HIGH 10
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#define AD7877_REG_TEMP1LOW 11
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#define AD7877_REG_SEQ0 12
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#define AD7877_REG_SEQ1 13
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#define AD7877_REG_DAC 14
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#define AD7877_REG_NONE1 15
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#define AD7877_REG_EXTWRITE 15
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#define AD7877_REG_XPLUS 16
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#define AD7877_REG_YPLUS 17
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#define AD7877_REG_Z2 18
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#define AD7877_REG_aux1 19
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#define AD7877_REG_aux2 20
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#define AD7877_REG_aux3 21
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#define AD7877_REG_bat1 22
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#define AD7877_REG_bat2 23
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#define AD7877_REG_temp1 24
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#define AD7877_REG_temp2 25
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#define AD7877_REG_Z1 26
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#define AD7877_REG_GPIOCTRL1 27
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#define AD7877_REG_GPIOCTRL2 28
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#define AD7877_REG_GPIODATA 29
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#define AD7877_REG_NONE2 30
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#define AD7877_REG_NONE3 31
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#define AD7877_SEQ_YPLUS_BIT (1<<11)
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#define AD7877_SEQ_XPLUS_BIT (1<<10)
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#define AD7877_SEQ_Z2_BIT (1<<9)
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#define AD7877_SEQ_AUX1_BIT (1<<8)
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#define AD7877_SEQ_AUX2_BIT (1<<7)
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#define AD7877_SEQ_AUX3_BIT (1<<6)
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#define AD7877_SEQ_BAT1_BIT (1<<5)
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#define AD7877_SEQ_BAT2_BIT (1<<4)
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#define AD7877_SEQ_TEMP1_BIT (1<<3)
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#define AD7877_SEQ_TEMP2_BIT (1<<2)
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#define AD7877_SEQ_Z1_BIT (1<<1)
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enum {
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AD7877_SEQ_YPOS = 0,
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AD7877_SEQ_XPOS = 1,
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AD7877_SEQ_Z2 = 2,
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AD7877_SEQ_AUX1 = 3,
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AD7877_SEQ_AUX2 = 4,
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AD7877_SEQ_AUX3 = 5,
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AD7877_SEQ_BAT1 = 6,
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AD7877_SEQ_BAT2 = 7,
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AD7877_SEQ_TEMP1 = 8,
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AD7877_SEQ_TEMP2 = 9,
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AD7877_SEQ_Z1 = 10,
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AD7877_NR_SENSE = 11,
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};
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/* DAC Register Default RANGE 0 to Vcc, Volatge Mode, DAC On */
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#define AD7877_DAC_CONF 0x1
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/* If gpio3 is set AUX3/GPIO3 acts as GPIO Output */
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#define AD7877_EXTW_GPIO_3_CONF 0x1C4
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#define AD7877_EXTW_GPIO_DATA 0x200
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/* Control REG 2 */
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#define AD7877_TMR(x) ((x & 0x3) << 0)
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#define AD7877_REF(x) ((x & 0x1) << 2)
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#define AD7877_POL(x) ((x & 0x1) << 3)
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#define AD7877_FCD(x) ((x & 0x3) << 4)
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#define AD7877_PM(x) ((x & 0x3) << 6)
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#define AD7877_ACQ(x) ((x & 0x3) << 8)
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#define AD7877_AVG(x) ((x & 0x3) << 10)
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/* Control REG 1 */
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#define AD7877_SER (1 << 11) /* non-differential */
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#define AD7877_DFR (0 << 11) /* differential */
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#define AD7877_MODE_NOC (0) /* Do not convert */
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#define AD7877_MODE_SCC (1) /* Single channel conversion */
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#define AD7877_MODE_SEQ0 (2) /* Sequence 0 in Slave Mode */
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#define AD7877_MODE_SEQ1 (3) /* Sequence 1 in Master Mode */
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#define AD7877_CHANADD(x) ((x&0xF)<<7)
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#define AD7877_READADD(x) ((x)<<2)
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#define AD7877_WRITEADD(x) ((x)<<12)
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#define AD7877_READ_CHAN(x) (AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_SER | \
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AD7877_MODE_SCC | AD7877_CHANADD(AD7877_REG_ ## x) | \
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AD7877_READADD(AD7877_REG_ ## x))
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#define AD7877_MM_SEQUENCE (AD7877_SEQ_YPLUS_BIT | AD7877_SEQ_XPLUS_BIT | \
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AD7877_SEQ_Z2_BIT | AD7877_SEQ_Z1_BIT)
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/*
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* Non-touchscreen sensors only use single-ended conversions.
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*/
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struct ser_req {
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u16 reset;
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u16 ref_on;
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u16 command;
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struct spi_message msg;
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struct spi_transfer xfer[6];
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/*
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* DMA (thus cache coherency maintenance) requires the
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* transfer buffers to live in their own cache lines.
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*/
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u16 sample ____cacheline_aligned;
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};
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struct ad7877 {
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struct input_dev *input;
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char phys[32];
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struct spi_device *spi;
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u16 model;
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u16 vref_delay_usecs;
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u16 x_plate_ohms;
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u16 pressure_max;
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u16 cmd_crtl1;
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u16 cmd_crtl2;
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u16 cmd_dummy;
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u16 dac;
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u8 stopacq_polarity;
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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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struct spi_transfer xfer[AD7877_NR_SENSE + 2];
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struct spi_message msg;
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struct mutex mutex;
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bool disabled; /* P: mutex */
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bool gpio3; /* P: mutex */
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bool gpio4; /* P: mutex */
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spinlock_t lock;
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struct timer_list timer; /* P: lock */
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/*
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* DMA (thus cache coherency maintenance) requires the
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* transfer buffers to live in their own cache lines.
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*/
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u16 conversion_data[AD7877_NR_SENSE] ____cacheline_aligned;
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};
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static bool gpio3;
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module_param(gpio3, bool, 0);
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MODULE_PARM_DESC(gpio3, "If gpio3 is set to 1 AUX3 acts as GPIO3");
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static int ad7877_read(struct spi_device *spi, u16 reg)
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{
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struct ser_req *req;
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int status, ret;
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req = kzalloc(sizeof *req, GFP_KERNEL);
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if (!req)
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return -ENOMEM;
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spi_message_init(&req->msg);
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req->command = (u16) (AD7877_WRITEADD(AD7877_REG_CTRL1) |
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AD7877_READADD(reg));
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req->xfer[0].tx_buf = &req->command;
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req->xfer[0].len = 2;
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req->xfer[0].cs_change = 1;
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req->xfer[1].rx_buf = &req->sample;
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req->xfer[1].len = 2;
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spi_message_add_tail(&req->xfer[0], &req->msg);
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spi_message_add_tail(&req->xfer[1], &req->msg);
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status = spi_sync(spi, &req->msg);
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ret = status ? : req->sample;
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kfree(req);
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return ret;
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}
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static int ad7877_write(struct spi_device *spi, u16 reg, u16 val)
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{
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struct ser_req *req;
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int status;
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req = kzalloc(sizeof *req, GFP_KERNEL);
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if (!req)
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return -ENOMEM;
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spi_message_init(&req->msg);
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req->command = (u16) (AD7877_WRITEADD(reg) | (val & MAX_12BIT));
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req->xfer[0].tx_buf = &req->command;
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req->xfer[0].len = 2;
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spi_message_add_tail(&req->xfer[0], &req->msg);
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status = spi_sync(spi, &req->msg);
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kfree(req);
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return status;
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}
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static int ad7877_read_adc(struct spi_device *spi, unsigned command)
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{
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struct ad7877 *ts = spi_get_drvdata(spi);
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struct ser_req *req;
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int status;
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int sample;
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int i;
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req = kzalloc(sizeof *req, GFP_KERNEL);
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if (!req)
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return -ENOMEM;
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spi_message_init(&req->msg);
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/* activate reference, so it has time to settle; */
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req->ref_on = AD7877_WRITEADD(AD7877_REG_CTRL2) |
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AD7877_POL(ts->stopacq_polarity) |
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AD7877_AVG(0) | AD7877_PM(2) | AD7877_TMR(0) |
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AD7877_ACQ(ts->acquisition_time) | AD7877_FCD(0);
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req->reset = AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_MODE_NOC;
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req->command = (u16) command;
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req->xfer[0].tx_buf = &req->reset;
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req->xfer[0].len = 2;
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req->xfer[0].cs_change = 1;
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req->xfer[1].tx_buf = &req->ref_on;
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req->xfer[1].len = 2;
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req->xfer[1].delay_usecs = ts->vref_delay_usecs;
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req->xfer[1].cs_change = 1;
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req->xfer[2].tx_buf = &req->command;
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req->xfer[2].len = 2;
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req->xfer[2].delay_usecs = ts->vref_delay_usecs;
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req->xfer[2].cs_change = 1;
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req->xfer[3].rx_buf = &req->sample;
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req->xfer[3].len = 2;
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req->xfer[3].cs_change = 1;
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req->xfer[4].tx_buf = &ts->cmd_crtl2; /*REF OFF*/
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req->xfer[4].len = 2;
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req->xfer[4].cs_change = 1;
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req->xfer[5].tx_buf = &ts->cmd_crtl1; /*DEFAULT*/
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req->xfer[5].len = 2;
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/* group all the transfers together, so we can't interfere with
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* reading touchscreen state; disable penirq while sampling
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*/
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for (i = 0; i < 6; i++)
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spi_message_add_tail(&req->xfer[i], &req->msg);
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status = spi_sync(spi, &req->msg);
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sample = req->sample;
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kfree(req);
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return status ? : sample;
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}
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static int ad7877_process_data(struct ad7877 *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[AD7877_SEQ_XPOS] & MAX_12BIT;
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y = ts->conversion_data[AD7877_SEQ_YPOS] & MAX_12BIT;
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z1 = ts->conversion_data[AD7877_SEQ_Z1] & MAX_12BIT;
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z2 = ts->conversion_data[AD7877_SEQ_Z2] & MAX_12BIT;
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/*
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* The samples processed here are already preprocessed by the AD7877.
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* The preprocessing function consists of an averaging filter.
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* The combination of 'first conversion delay' and averaging 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 the averaging filter is programmable. (dev.platform_data, see linux/spi/ad7877.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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/*
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* Sample found inconsistent, pressure is beyond
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* the maximum. Don't report it to user space.
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*/
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if (Rt > ts->pressure_max)
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return -EINVAL;
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if (!timer_pending(&ts->timer))
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input_report_key(input_dev, BTN_TOUCH, 1);
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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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return 0;
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}
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return -EINVAL;
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}
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static inline void ad7877_ts_event_release(struct ad7877 *ts)
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{
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struct input_dev *input_dev = ts->input;
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input_report_abs(input_dev, ABS_PRESSURE, 0);
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input_report_key(input_dev, BTN_TOUCH, 0);
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input_sync(input_dev);
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}
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static void ad7877_timer(unsigned long handle)
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{
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struct ad7877 *ts = (void *)handle;
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unsigned long flags;
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spin_lock_irqsave(&ts->lock, flags);
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ad7877_ts_event_release(ts);
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spin_unlock_irqrestore(&ts->lock, flags);
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}
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static irqreturn_t ad7877_irq(int irq, void *handle)
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{
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struct ad7877 *ts = handle;
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unsigned long flags;
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int error;
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error = spi_sync(ts->spi, &ts->msg);
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if (error) {
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dev_err(&ts->spi->dev, "spi_sync --> %d\n", error);
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goto out;
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}
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spin_lock_irqsave(&ts->lock, flags);
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error = ad7877_process_data(ts);
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if (!error)
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mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
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spin_unlock_irqrestore(&ts->lock, flags);
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out:
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return IRQ_HANDLED;
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}
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static void ad7877_disable(struct ad7877 *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 = true;
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disable_irq(ts->spi->irq);
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if (del_timer_sync(&ts->timer))
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ad7877_ts_event_release(ts);
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}
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/*
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* We know the chip's in lowpower mode since we always
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* leave it that way after every request
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*/
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mutex_unlock(&ts->mutex);
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}
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static void ad7877_enable(struct ad7877 *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 = false;
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enable_irq(ts->spi->irq);
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}
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mutex_unlock(&ts->mutex);
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}
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#define SHOW(name) static ssize_t \
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name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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struct ad7877 *ts = dev_get_drvdata(dev); \
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ssize_t v = ad7877_read_adc(ts->spi, \
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AD7877_READ_CHAN(name)); \
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if (v < 0) \
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return v; \
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return sprintf(buf, "%u\n", (unsigned) v); \
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} \
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static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL);
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SHOW(aux1)
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SHOW(aux2)
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SHOW(aux3)
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SHOW(bat1)
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SHOW(bat2)
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SHOW(temp1)
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SHOW(temp2)
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static ssize_t ad7877_disable_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ad7877 *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 ad7877_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 ad7877 *ts = dev_get_drvdata(dev);
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unsigned int val;
|
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int error;
|
|
|
|
error = kstrtouint(buf, 10, &val);
|
|
if (error)
|
|
return error;
|
|
|
|
if (val)
|
|
ad7877_disable(ts);
|
|
else
|
|
ad7877_enable(ts);
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(disable, 0664, ad7877_disable_show, ad7877_disable_store);
|
|
|
|
static ssize_t ad7877_dac_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ad7877 *ts = dev_get_drvdata(dev);
|
|
|
|
return sprintf(buf, "%u\n", ts->dac);
|
|
}
|
|
|
|
static ssize_t ad7877_dac_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct ad7877 *ts = dev_get_drvdata(dev);
|
|
unsigned int val;
|
|
int error;
|
|
|
|
error = kstrtouint(buf, 10, &val);
|
|
if (error)
|
|
return error;
|
|
|
|
mutex_lock(&ts->mutex);
|
|
ts->dac = val & 0xFF;
|
|
ad7877_write(ts->spi, AD7877_REG_DAC, (ts->dac << 4) | AD7877_DAC_CONF);
|
|
mutex_unlock(&ts->mutex);
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(dac, 0664, ad7877_dac_show, ad7877_dac_store);
|
|
|
|
static ssize_t ad7877_gpio3_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ad7877 *ts = dev_get_drvdata(dev);
|
|
|
|
return sprintf(buf, "%u\n", ts->gpio3);
|
|
}
|
|
|
|
static ssize_t ad7877_gpio3_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct ad7877 *ts = dev_get_drvdata(dev);
|
|
unsigned int val;
|
|
int error;
|
|
|
|
error = kstrtouint(buf, 10, &val);
|
|
if (error)
|
|
return error;
|
|
|
|
mutex_lock(&ts->mutex);
|
|
ts->gpio3 = !!val;
|
|
ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA |
|
|
(ts->gpio4 << 4) | (ts->gpio3 << 5));
|
|
mutex_unlock(&ts->mutex);
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(gpio3, 0664, ad7877_gpio3_show, ad7877_gpio3_store);
|
|
|
|
static ssize_t ad7877_gpio4_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ad7877 *ts = dev_get_drvdata(dev);
|
|
|
|
return sprintf(buf, "%u\n", ts->gpio4);
|
|
}
|
|
|
|
static ssize_t ad7877_gpio4_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct ad7877 *ts = dev_get_drvdata(dev);
|
|
unsigned int val;
|
|
int error;
|
|
|
|
error = kstrtouint(buf, 10, &val);
|
|
if (error)
|
|
return error;
|
|
|
|
mutex_lock(&ts->mutex);
|
|
ts->gpio4 = !!val;
|
|
ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA |
|
|
(ts->gpio4 << 4) | (ts->gpio3 << 5));
|
|
mutex_unlock(&ts->mutex);
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(gpio4, 0664, ad7877_gpio4_show, ad7877_gpio4_store);
|
|
|
|
static struct attribute *ad7877_attributes[] = {
|
|
&dev_attr_temp1.attr,
|
|
&dev_attr_temp2.attr,
|
|
&dev_attr_aux1.attr,
|
|
&dev_attr_aux2.attr,
|
|
&dev_attr_aux3.attr,
|
|
&dev_attr_bat1.attr,
|
|
&dev_attr_bat2.attr,
|
|
&dev_attr_disable.attr,
|
|
&dev_attr_dac.attr,
|
|
&dev_attr_gpio3.attr,
|
|
&dev_attr_gpio4.attr,
|
|
NULL
|
|
};
|
|
|
|
static umode_t ad7877_attr_is_visible(struct kobject *kobj,
|
|
struct attribute *attr, int n)
|
|
{
|
|
umode_t mode = attr->mode;
|
|
|
|
if (attr == &dev_attr_aux3.attr) {
|
|
if (gpio3)
|
|
mode = 0;
|
|
} else if (attr == &dev_attr_gpio3.attr) {
|
|
if (!gpio3)
|
|
mode = 0;
|
|
}
|
|
|
|
return mode;
|
|
}
|
|
|
|
static const struct attribute_group ad7877_attr_group = {
|
|
.is_visible = ad7877_attr_is_visible,
|
|
.attrs = ad7877_attributes,
|
|
};
|
|
|
|
static void ad7877_setup_ts_def_msg(struct spi_device *spi, struct ad7877 *ts)
|
|
{
|
|
struct spi_message *m;
|
|
int i;
|
|
|
|
ts->cmd_crtl2 = AD7877_WRITEADD(AD7877_REG_CTRL2) |
|
|
AD7877_POL(ts->stopacq_polarity) |
|
|
AD7877_AVG(ts->averaging) | AD7877_PM(1) |
|
|
AD7877_TMR(ts->pen_down_acc_interval) |
|
|
AD7877_ACQ(ts->acquisition_time) |
|
|
AD7877_FCD(ts->first_conversion_delay);
|
|
|
|
ad7877_write(spi, AD7877_REG_CTRL2, ts->cmd_crtl2);
|
|
|
|
ts->cmd_crtl1 = AD7877_WRITEADD(AD7877_REG_CTRL1) |
|
|
AD7877_READADD(AD7877_REG_XPLUS-1) |
|
|
AD7877_MODE_SEQ1 | AD7877_DFR;
|
|
|
|
ad7877_write(spi, AD7877_REG_CTRL1, ts->cmd_crtl1);
|
|
|
|
ts->cmd_dummy = 0;
|
|
|
|
m = &ts->msg;
|
|
|
|
spi_message_init(m);
|
|
|
|
m->context = ts;
|
|
|
|
ts->xfer[0].tx_buf = &ts->cmd_crtl1;
|
|
ts->xfer[0].len = 2;
|
|
ts->xfer[0].cs_change = 1;
|
|
|
|
spi_message_add_tail(&ts->xfer[0], m);
|
|
|
|
ts->xfer[1].tx_buf = &ts->cmd_dummy; /* Send ZERO */
|
|
ts->xfer[1].len = 2;
|
|
ts->xfer[1].cs_change = 1;
|
|
|
|
spi_message_add_tail(&ts->xfer[1], m);
|
|
|
|
for (i = 0; i < AD7877_NR_SENSE; i++) {
|
|
ts->xfer[i + 2].rx_buf = &ts->conversion_data[AD7877_SEQ_YPOS + i];
|
|
ts->xfer[i + 2].len = 2;
|
|
if (i < (AD7877_NR_SENSE - 1))
|
|
ts->xfer[i + 2].cs_change = 1;
|
|
spi_message_add_tail(&ts->xfer[i + 2], m);
|
|
}
|
|
}
|
|
|
|
static int ad7877_probe(struct spi_device *spi)
|
|
{
|
|
struct ad7877 *ts;
|
|
struct input_dev *input_dev;
|
|
struct ad7877_platform_data *pdata = dev_get_platdata(&spi->dev);
|
|
int err;
|
|
u16 verify;
|
|
|
|
if (!spi->irq) {
|
|
dev_dbg(&spi->dev, "no IRQ?\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (!pdata) {
|
|
dev_dbg(&spi->dev, "no platform data?\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* don't exceed max specified SPI CLK frequency */
|
|
if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
|
|
dev_dbg(&spi->dev, "SPI CLK %d Hz?\n",spi->max_speed_hz);
|
|
return -EINVAL;
|
|
}
|
|
|
|
spi->bits_per_word = 16;
|
|
err = spi_setup(spi);
|
|
if (err) {
|
|
dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n");
|
|
return err;
|
|
}
|
|
|
|
ts = kzalloc(sizeof(struct ad7877), GFP_KERNEL);
|
|
input_dev = input_allocate_device();
|
|
if (!ts || !input_dev) {
|
|
err = -ENOMEM;
|
|
goto err_free_mem;
|
|
}
|
|
|
|
spi_set_drvdata(spi, ts);
|
|
ts->spi = spi;
|
|
ts->input = input_dev;
|
|
|
|
setup_timer(&ts->timer, ad7877_timer, (unsigned long) ts);
|
|
mutex_init(&ts->mutex);
|
|
spin_lock_init(&ts->lock);
|
|
|
|
ts->model = pdata->model ? : 7877;
|
|
ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100;
|
|
ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
|
|
ts->pressure_max = pdata->pressure_max ? : ~0;
|
|
|
|
ts->stopacq_polarity = pdata->stopacq_polarity;
|
|
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;
|
|
|
|
snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
|
|
|
|
input_dev->name = "AD7877 Touchscreen";
|
|
input_dev->phys = ts->phys;
|
|
input_dev->dev.parent = &spi->dev;
|
|
|
|
__set_bit(EV_KEY, input_dev->evbit);
|
|
__set_bit(BTN_TOUCH, input_dev->keybit);
|
|
__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);
|
|
|
|
ad7877_write(spi, AD7877_REG_SEQ1, AD7877_MM_SEQUENCE);
|
|
|
|
verify = ad7877_read(spi, AD7877_REG_SEQ1);
|
|
|
|
if (verify != AD7877_MM_SEQUENCE){
|
|
dev_err(&spi->dev, "%s: Failed to probe %s\n",
|
|
dev_name(&spi->dev), input_dev->name);
|
|
err = -ENODEV;
|
|
goto err_free_mem;
|
|
}
|
|
|
|
if (gpio3)
|
|
ad7877_write(spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_3_CONF);
|
|
|
|
ad7877_setup_ts_def_msg(spi, ts);
|
|
|
|
/* Request AD7877 /DAV GPIO interrupt */
|
|
|
|
err = request_threaded_irq(spi->irq, NULL, ad7877_irq,
|
|
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
|
spi->dev.driver->name, ts);
|
|
if (err) {
|
|
dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
|
|
goto err_free_mem;
|
|
}
|
|
|
|
err = sysfs_create_group(&spi->dev.kobj, &ad7877_attr_group);
|
|
if (err)
|
|
goto err_free_irq;
|
|
|
|
err = input_register_device(input_dev);
|
|
if (err)
|
|
goto err_remove_attr_group;
|
|
|
|
return 0;
|
|
|
|
err_remove_attr_group:
|
|
sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group);
|
|
err_free_irq:
|
|
free_irq(spi->irq, ts);
|
|
err_free_mem:
|
|
input_free_device(input_dev);
|
|
kfree(ts);
|
|
return err;
|
|
}
|
|
|
|
static int ad7877_remove(struct spi_device *spi)
|
|
{
|
|
struct ad7877 *ts = spi_get_drvdata(spi);
|
|
|
|
sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group);
|
|
|
|
ad7877_disable(ts);
|
|
free_irq(ts->spi->irq, ts);
|
|
|
|
input_unregister_device(ts->input);
|
|
kfree(ts);
|
|
|
|
dev_dbg(&spi->dev, "unregistered touchscreen\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused ad7877_suspend(struct device *dev)
|
|
{
|
|
struct ad7877 *ts = dev_get_drvdata(dev);
|
|
|
|
ad7877_disable(ts);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused ad7877_resume(struct device *dev)
|
|
{
|
|
struct ad7877 *ts = dev_get_drvdata(dev);
|
|
|
|
ad7877_enable(ts);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(ad7877_pm, ad7877_suspend, ad7877_resume);
|
|
|
|
static struct spi_driver ad7877_driver = {
|
|
.driver = {
|
|
.name = "ad7877",
|
|
.pm = &ad7877_pm,
|
|
},
|
|
.probe = ad7877_probe,
|
|
.remove = ad7877_remove,
|
|
};
|
|
|
|
module_spi_driver(ad7877_driver);
|
|
|
|
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
|
|
MODULE_DESCRIPTION("AD7877 touchscreen Driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("spi:ad7877");
|