![Dan Carpenter](/assets/img/avatar_default.png)
I moved the kfree() down a couple lines after the dereference. Signed-off-by: Dan Carpenter <error27@gmail.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
865 lines
20 KiB
C
865 lines
20 KiB
C
/*
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* intel_mid_touch.c - Intel MID Resistive Touch Screen Driver
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*
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* Copyright (C) 2008 Intel Corp
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 along
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* with this program; ifnot, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* Questions/Comments/Bug fixes to Sreedhara (sreedhara.ds@intel.com)
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* Ramesh Agarwal (ramesh.agarwal@intel.com)
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* TODO:
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* kill off mrstouch_debug eventually
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* review conversion of r/m/w sequences
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* Replace interrupt mutex abuse
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* Kill of mrstouchdevp pointer
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/err.h>
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#include <linux/param.h>
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#include <linux/spi/spi.h>
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#include <linux/irq.h>
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#include <linux/delay.h>
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#include <linux/kthread.h>
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#include <asm/intel_scu_ipc.h>
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#if defined(MRSTOUCH_DEBUG)
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#define mrstouch_debug(fmt, args...)\
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do { \
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printk(KERN_DEBUG "\n[MRSTOUCH(%d)] - ", __LINE__); \
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printk(KERN_DEBUG fmt, ##args); \
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} while (0);
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#else
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#define mrstouch_debug(fmt, args...)
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#endif
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/* PMIC Interrupt registers */
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#define PMIC_REG_ID1 0x00 /*PMIC ID1 register */
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/* PMIC Interrupt registers */
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#define PMIC_REG_INT 0x04 /*PMIC interrupt register */
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#define PMIC_REG_MINT 0x05 /*PMIC interrupt mask register */
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/* ADC Interrupt registers */
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#define PMIC_REG_ADCINT 0x5F /*ADC interrupt register */
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#define PMIC_REG_MADCINT 0x60 /*ADC interrupt mask register */
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/* ADC Control registers */
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#define PMIC_REG_ADCCNTL1 0x61 /*ADC control register */
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/* ADC Channel Selection registers */
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#define PMICADDR0 0xA4
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#define END_OF_CHANNEL 0x1F
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/* ADC Result register */
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#define PMIC_REG_ADCSNS0H 0x64
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/* ADC channels for touch screen */
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#define MRST_TS_CHAN10 0xA /* Touch screen X+ connection */
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#define MRST_TS_CHAN11 0xB /* Touch screen X- connection */
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#define MRST_TS_CHAN12 0xC /* Touch screen Y+ connection */
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#define MRST_TS_CHAN13 0xD /* Touch screen Y- connection */
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/* Touch screen coordinate constants */
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#define TOUCH_PRESSURE 50
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#define TOUCH_PRESSURE_FS 100
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#define XMOVE_LIMIT 5
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#define YMOVE_LIMIT 5
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#define XYMOVE_CNT 3
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#define MAX_10BIT ((1<<10)-1)
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/* Touch screen channel BIAS constants */
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#define XBIAS 0x20
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#define YBIAS 0x40
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#define ZBIAS 0x80
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/* Touch screen coordinates */
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#define MIN_X 10
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#define MAX_X 1024
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#define MIN_Y 10
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#define MAX_Y 1024
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#define WAIT_ADC_COMPLETION 10
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/* PMIC ADC round robin delays */
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#define ADC_LOOP_DELAY0 0x0 /* Continuous loop */
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#define ADC_LOOP_DELAY1 0x1 /* 4.5 ms approximate */
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/* PMIC Vendor Identifiers */
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#define PMIC_VENDOR_FS 0 /* PMIC vendor FreeScale */
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#define PMIC_VENDOR_MAXIM 1 /* PMIC vendor MAXIM */
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#define PMIC_VENDOR_NEC 2 /* PMIC vendor NEC */
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#define MRSTOUCH_MAX_CHANNELS 32 /* Maximum ADC channels */
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/* Touch screen device structure */
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struct mrstouch_dev {
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struct spi_device *spi; /* SPI device associated with touch screen */
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struct input_dev *input; /* input device for touchscreen*/
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char phys[32]; /* Device name */
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struct task_struct *pendet_thrd; /* PENDET interrupt handler */
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struct mutex lock; /* Sync between interrupt and PENDET handler */
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bool busy; /* Busy flag */
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u16 asr; /* Address selection register */
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int irq; /* Touch screen IRQ # */
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uint vendor; /* PMIC vendor */
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uint rev; /* PMIC revision */
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bool suspended; /* Device suspended status */
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bool disabled; /* Device disabled status */
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u16 x; /* X coordinate */
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u16 y; /* Y coordinate */
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bool pendown; /* PEN position */
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} ;
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/* Global Pointer to Touch screen device */
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static struct mrstouch_dev *mrstouchdevp;
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/* Utility to read PMIC ID */
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static int mrstouch_pmic_id(uint *vendor, uint *rev)
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{
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int err;
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u8 r;
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err = intel_scu_ipc_ioread8(PMIC_REG_ID1, &r);
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if (err)
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return err;
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*vendor = r & 0x7;
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*rev = (r >> 3) & 0x7;
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return 0;
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}
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/*
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* Parse ADC channels to find end of the channel configured by other ADC user
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* NEC and MAXIM requires 4 channels and FreeScale needs 18 channels
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*/
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static int mrstouch_chan_parse(struct mrstouch_dev *tsdev)
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{
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int err, i, j, found;
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u32 r32;
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found = -1;
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for (i = 0; i < MRSTOUCH_MAX_CHANNELS; i++) {
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if (found >= 0)
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break;
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err = intel_scu_ipc_ioread32(PMICADDR0, &r32);
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if (err)
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return err;
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for (j = 0; j < 32; j+= 8) {
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if (((r32 >> j) & 0xFF) == END_OF_CHANNEL) {
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found = i;
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break;
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}
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}
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}
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if (found < 0)
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return 0;
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if (tsdev->vendor == PMIC_VENDOR_FS) {
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if (found && found > (MRSTOUCH_MAX_CHANNELS - 18))
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return -ENOSPC;
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} else {
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if (found && found > (MRSTOUCH_MAX_CHANNELS - 4))
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return -ENOSPC;
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}
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return found;
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}
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/* Utility to enable/disable pendet.
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* pendet set to true enables PENDET interrupt
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* pendet set to false disables PENDET interrupt
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* Also clears RND mask bit
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*/
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static int pendet_enable(struct mrstouch_dev *tsdev, bool pendet)
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{
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u16 reg;
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u8 r;
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u8 pendet_enabled = 0;
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int retry = 0;
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int err;
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err = intel_scu_ipc_ioread16(PMIC_REG_MADCINT, ®);
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if (err)
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return err;
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if (pendet) {
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reg &= ~0x0005;
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reg |= 0x2000; /* Enable pendet */
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} else
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reg &= 0xDFFF; /* Disable pendet */
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/* Set MADCINT and update ADCCNTL1 (next reg byte) */
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err = intel_scu_ipc_iowrite16(PMIC_REG_MADCINT, reg);
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if (!pendet || err)
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return err;
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/*
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* Sometimes even after the register write succeeds
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* the PMIC register value is not updated. Retry few iterations
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* to enable pendet.
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*/
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err = intel_scu_ipc_ioread8(PMIC_REG_ADCCNTL1, &r);
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pendet_enabled = (r >> 5) & 0x01;
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retry = 0;
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while (!err && !pendet_enabled) {
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retry++;
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msleep(10);
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err = intel_scu_ipc_iowrite8(PMIC_REG_ADCCNTL1, reg >> 8);
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if (err)
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break;
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err = intel_scu_ipc_ioread8(PMIC_REG_ADCCNTL1, &r);
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if (err == 0)
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pendet_enabled = (r >> 5) & 0x01;
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if (retry >= 10) {
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dev_err(&tsdev->spi->dev, "Touch screen disabled.\n");
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return -EIO;
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}
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}
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return 0;
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}
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/* To read PMIC ADC touch screen result
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* Reads ADC storage registers for higher 7 and lower 3 bits
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* converts the two readings to single value and turns off gain bit
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*/
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static int mrstouch_ts_chan_read(u16 offset, u16 chan, u16 *vp, u16 *vm)
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{
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int err;
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u16 result;
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u32 res;
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result = PMIC_REG_ADCSNS0H + offset;
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if (chan == MRST_TS_CHAN12)
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result += 4;
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err = intel_scu_ipc_ioread32(result, &res);
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if (err)
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return err;
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/* Mash the bits up */
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*vp = (res & 0xFF) << 3; /* Highest 7 bits */
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*vp |= (res >> 8) & 0x07; /* Lower 3 bits */
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*vp &= 0x3FF;
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res >>= 16;
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*vm = (res & 0xFF) << 3; /* Highest 7 bits */
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*vm |= (res >> 8) & 0x07; /* Lower 3 bits */
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*vm &= 0x3FF;
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return 0;
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}
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/* To configure touch screen channels
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* Writes touch screen channels to ADC address selection registers
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*/
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static int mrstouch_ts_chan_set(uint offset)
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{
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int count;
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u16 chan;
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u16 reg[5];
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u8 data[5];
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chan = PMICADDR0 + offset;
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for (count = 0; count <= 3; count++) {
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reg[count] = chan++;
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data[count] = MRST_TS_CHAN10 + count;
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}
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reg[count] = chan;
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data[count] = END_OF_CHANNEL;
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return intel_scu_ipc_writev(reg, data, 5);
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}
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/* Initialize ADC */
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static int mrstouch_adc_init(struct mrstouch_dev *tsdev)
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{
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int err, start;
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u8 ra, rm;
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err = mrstouch_pmic_id(&tsdev->vendor, &tsdev->rev);
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if (err) {
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dev_err(&tsdev->spi->dev, "Unable to read PMIC id\n");
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return err;
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}
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start = mrstouch_chan_parse(tsdev);
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if (start < 0) {
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dev_err(&tsdev->spi->dev, "Unable to parse channels\n");
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return start;
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}
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tsdev->asr = start;
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mrstouch_debug("Channel offset(%d): 0x%X\n", tsdev->asr, tsdev->vendor);
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/* ADC power on, start, enable PENDET and set loop delay
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* ADC loop delay is set to 4.5 ms approximately
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* Loop delay more than this results in jitter in adc readings
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* Setting loop delay to 0 (continous loop) in MAXIM stops PENDET
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* interrupt generation sometimes.
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*/
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if (tsdev->vendor == PMIC_VENDOR_FS) {
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ra = 0xE0 | ADC_LOOP_DELAY0;
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rm = 0x5;
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} else {
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/* NEC and MAXIm not consistent with loop delay 0 */
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ra = 0xE0 | ADC_LOOP_DELAY1;
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rm = 0x0;
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/* configure touch screen channels */
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err = mrstouch_ts_chan_set(tsdev->asr);
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if (err)
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return err;
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}
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err = intel_scu_ipc_update_register(PMIC_REG_ADCCNTL1, ra, 0xE7);
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if (err == 0)
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err = intel_scu_ipc_update_register(PMIC_REG_MADCINT, rm, 0x03);
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return err;
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}
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/* Reports x,y coordinates to event subsystem */
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static void mrstouch_report_xy(struct mrstouch_dev *tsdev, u16 x, u16 y, u16 z)
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{
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int xdiff, ydiff;
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if (tsdev->pendown && z <= TOUCH_PRESSURE) {
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/* Pen removed, report button release */
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mrstouch_debug("BTN REL(%d)", z);
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input_report_key(tsdev->input, BTN_TOUCH, 0);
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tsdev->pendown = false;
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}
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xdiff = abs(x - tsdev->x);
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ydiff = abs(y - tsdev->y);
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/*
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if x and y values changes for XYMOVE_CNT readings it is considered
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as stylus is moving. This is required to differentiate between stylus
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movement and jitter
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*/
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if (x < MIN_X || x > MAX_X || y < MIN_Y || y > MAX_Y) {
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/* Spurious values, release button if touched and return */
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if (tsdev->pendown) {
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mrstouch_debug("BTN REL(%d)", z);
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input_report_key(tsdev->input, BTN_TOUCH, 0);
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tsdev->pendown = false;
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}
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return;
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} else if (xdiff >= XMOVE_LIMIT || ydiff >= YMOVE_LIMIT) {
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tsdev->x = x;
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tsdev->y = y;
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input_report_abs(tsdev->input, ABS_X, x);
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input_report_abs(tsdev->input, ABS_Y, y);
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input_sync(tsdev->input);
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}
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if (!tsdev->pendown && z > TOUCH_PRESSURE) {
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/* Pen touched, report button touch */
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mrstouch_debug("BTN TCH(%d, %d, %d)", x, y, z);
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input_report_key(tsdev->input, BTN_TOUCH, 1);
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tsdev->pendown = true;
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}
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}
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/* Utility to start ADC, used by freescale handler */
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static int pendet_mask(void)
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{
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return intel_scu_ipc_update_register(PMIC_REG_MADCINT, 0x02, 0x02);
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}
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/* Utility to stop ADC, used by freescale handler */
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static int pendet_umask(void)
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{
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return intel_scu_ipc_update_register(PMIC_REG_MADCINT, 0x00, 0x02);
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}
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/* Utility to read ADC, used by freescale handler */
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static int mrstouch_pmic_fs_adc_read(struct mrstouch_dev *tsdev)
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{
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int err;
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u16 x, y, z, result;
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u16 reg[4];
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u8 data[4];
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result = PMIC_REG_ADCSNS0H + tsdev->asr;
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reg[0] = result + 4;
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reg[1] = result + 5;
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reg[2] = result + 16;
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reg[3] = result + 17;
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err = intel_scu_ipc_readv(reg, data, 4);
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if (err)
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goto ipc_error;
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x = data[0] << 3; /* Higher 7 bits */
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x |= data[1] & 0x7; /* Lower 3 bits */
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x &= 0x3FF;
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y = data[2] << 3; /* Higher 7 bits */
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y |= data[3] & 0x7; /* Lower 3 bits */
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y &= 0x3FF;
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/* Read Z value */
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reg[0] = result + 28;
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reg[1] = result + 29;
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err = intel_scu_ipc_readv(reg, data, 4);
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if (err)
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goto ipc_error;
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z = data[0] << 3; /* Higher 7 bits */
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z |= data[1] & 0x7; /* Lower 3 bits */
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z &= 0x3FF;
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#if defined(MRSTOUCH_PRINT_XYZP)
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mrstouch_debug("X: %d, Y: %d, Z: %d", x, y, z);
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#endif
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if (z >= TOUCH_PRESSURE_FS) {
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mrstouch_report_xy(tsdev, x, y, TOUCH_PRESSURE - 1); /* Pen Removed */
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return TOUCH_PRESSURE - 1;
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} else {
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mrstouch_report_xy(tsdev, x, y, TOUCH_PRESSURE + 1); /* Pen Touched */
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return TOUCH_PRESSURE + 1;
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}
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return 0;
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ipc_error:
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dev_err(&tsdev->spi->dev, "ipc error during fs_adc read\n");
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return err;
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}
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/* To handle free scale pmic pendet interrupt */
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static int pmic0_pendet(void *dev_id)
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{
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int err, count;
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u16 chan;
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unsigned int touched;
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struct mrstouch_dev *tsdev = (struct mrstouch_dev *)dev_id;
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u16 reg[5];
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u8 data[5];
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chan = PMICADDR0 + tsdev->asr;
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/* Set X BIAS */
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for (count = 0; count <= 3; count++) {
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reg[count] = chan++;
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data[count] = 0x2A;
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}
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reg[count] = chan++; /* Dummy */
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data[count] = 0;
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err = intel_scu_ipc_writev(reg, data, 5);
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if (err)
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goto ipc_error;
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msleep(WAIT_ADC_COMPLETION);
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/* Set Y BIAS */
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for (count = 0; count <= 3; count++) {
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reg[count] = chan++;
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data[count] = 0x4A;
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}
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reg[count] = chan++; /* Dummy */
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data[count] = 0;
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err = intel_scu_ipc_writev(reg, data, 5);
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if (err)
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goto ipc_error;
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msleep(WAIT_ADC_COMPLETION);
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/* Set Z BIAS */
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err = intel_scu_ipc_iowrite32(chan + 2, 0x8A8A8A8A);
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if (err)
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goto ipc_error;
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msleep(WAIT_ADC_COMPLETION);
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|
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/*Read touch screen channels till pen removed
|
|
* Freescale reports constant value of z for all points
|
|
* z is high when screen is not touched and low when touched
|
|
* Map high z value to not touched and low z value to pen touched
|
|
*/
|
|
touched = mrstouch_pmic_fs_adc_read(tsdev);
|
|
while (touched > TOUCH_PRESSURE) {
|
|
touched = mrstouch_pmic_fs_adc_read(tsdev);
|
|
msleep(WAIT_ADC_COMPLETION);
|
|
}
|
|
|
|
/* Clear all TS channels */
|
|
chan = PMICADDR0 + tsdev->asr;
|
|
for (count = 0; count <= 4; count++) {
|
|
reg[count] = chan++;
|
|
data[count] = 0;
|
|
}
|
|
err = intel_scu_ipc_writev(reg, data, 5);
|
|
if (err)
|
|
goto ipc_error;
|
|
|
|
for (count = 0; count <= 4; count++) {
|
|
reg[count] = chan++;
|
|
data[count] = 0;
|
|
}
|
|
err = intel_scu_ipc_writev(reg, data, 5);
|
|
if (err)
|
|
goto ipc_error;
|
|
|
|
err = intel_scu_ipc_iowrite32(chan + 2, 0x00000000);
|
|
if (err)
|
|
goto ipc_error;
|
|
|
|
return 0;
|
|
|
|
ipc_error:
|
|
dev_err(&tsdev->spi->dev, "ipc error during pendet\n");
|
|
return err;
|
|
}
|
|
|
|
|
|
/* To enable X, Y and Z bias values
|
|
* Enables YPYM for X channels and XPXM for Y channels
|
|
*/
|
|
static int mrstouch_ts_bias_set(uint offset, uint bias)
|
|
{
|
|
int count;
|
|
u16 chan, start;
|
|
u16 reg[4];
|
|
u8 data[4];
|
|
|
|
chan = PMICADDR0 + offset;
|
|
start = MRST_TS_CHAN10;
|
|
|
|
for (count = 0; count <= 3; count++) {
|
|
reg[count] = chan++;
|
|
data[count] = bias | (start + count);
|
|
}
|
|
return intel_scu_ipc_writev(reg, data, 4);
|
|
}
|
|
|
|
/* To read touch screen channel values */
|
|
static int mrstouch_adc_read(struct mrstouch_dev *tsdev)
|
|
{
|
|
int err;
|
|
u16 xp, xm, yp, ym, zp, zm;
|
|
|
|
/* configure Y bias for X channels */
|
|
err = mrstouch_ts_bias_set(tsdev->asr, YBIAS);
|
|
if (err)
|
|
goto ipc_error;
|
|
|
|
msleep(WAIT_ADC_COMPLETION);
|
|
|
|
/* read x+ and x- channels */
|
|
err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN10, &xp, &xm);
|
|
if (err)
|
|
goto ipc_error;
|
|
|
|
/* configure x bias for y channels */
|
|
err = mrstouch_ts_bias_set(tsdev->asr, XBIAS);
|
|
if (err)
|
|
goto ipc_error;
|
|
|
|
msleep(WAIT_ADC_COMPLETION);
|
|
|
|
/* read y+ and y- channels */
|
|
err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN12, &yp, &ym);
|
|
if (err)
|
|
goto ipc_error;
|
|
|
|
/* configure z bias for x and y channels */
|
|
err = mrstouch_ts_bias_set(tsdev->asr, ZBIAS);
|
|
if (err)
|
|
goto ipc_error;
|
|
|
|
msleep(WAIT_ADC_COMPLETION);
|
|
|
|
/* read z+ and z- channels */
|
|
err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN10, &zp, &zm);
|
|
if (err)
|
|
goto ipc_error;
|
|
|
|
#if defined(MRSTOUCH_PRINT_XYZP)
|
|
printk(KERN_INFO "X+: %d, Y+: %d, Z+: %d\n", xp, yp, zp);
|
|
#endif
|
|
|
|
#if defined(MRSTOUCH_PRINT_XYZM)
|
|
printk(KERN_INFO "X-: %d, Y-: %d, Z-: %d\n", xm, ym, zm);
|
|
#endif
|
|
|
|
mrstouch_report_xy(tsdev, xp, yp, zp); /* report x and y to eventX */
|
|
|
|
return zp;
|
|
|
|
ipc_error:
|
|
dev_err(&tsdev->spi->dev, "ipc error during adc read\n");
|
|
return err;
|
|
}
|
|
|
|
/* PENDET interrupt handler function for NEC and MAXIM */
|
|
static void pmic12_pendet(void *data)
|
|
{
|
|
unsigned int touched;
|
|
struct mrstouch_dev *tsdev = (struct mrstouch_dev *)data;
|
|
|
|
/* read touch screen channels till pen removed */
|
|
do {
|
|
touched = mrstouch_adc_read(tsdev);
|
|
} while (touched > TOUCH_PRESSURE);
|
|
}
|
|
|
|
/* Handler to process PENDET interrupt */
|
|
int mrstouch_pendet(void *data)
|
|
{
|
|
struct mrstouch_dev *tsdev = (struct mrstouch_dev *)data;
|
|
while (1) {
|
|
/* Wait for PENDET interrupt */
|
|
if (mutex_lock_interruptible(&tsdev->lock)) {
|
|
msleep(WAIT_ADC_COMPLETION);
|
|
continue;
|
|
}
|
|
|
|
if (tsdev->busy)
|
|
return 0;
|
|
|
|
tsdev->busy = true;
|
|
|
|
if (tsdev->vendor == PMIC_VENDOR_NEC ||
|
|
tsdev->vendor == PMIC_VENDOR_MAXIM) {
|
|
/* PENDET must be disabled in NEC before reading ADC */
|
|
pendet_enable(tsdev,false); /* Disbale PENDET */
|
|
pmic12_pendet(tsdev);
|
|
pendet_enable(tsdev, true); /*Enable PENDET */
|
|
} else if (tsdev->vendor == PMIC_VENDOR_FS) {
|
|
pendet_umask(); /* Stop ADC */
|
|
pmic0_pendet(tsdev);
|
|
pendet_mask(); /* Stop ADC */
|
|
} else
|
|
dev_err(&tsdev->spi->dev, "Unsupported touchscreen: %d\n",
|
|
tsdev->vendor);
|
|
|
|
tsdev->busy = false;
|
|
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* PENDET interrupt handler */
|
|
static irqreturn_t pendet_intr_handler(int irq, void *handle)
|
|
{
|
|
struct mrstouch_dev *tsdev = (struct mrstouch_dev *)handle;
|
|
|
|
mutex_unlock(&tsdev->lock);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/* Intializes input device and registers with input subsystem */
|
|
static int ts_input_dev_init(struct mrstouch_dev *tsdev, struct spi_device *spi)
|
|
{
|
|
int err = 0;
|
|
|
|
mrstouch_debug("%s", __func__);
|
|
|
|
tsdev->input = input_allocate_device();
|
|
if (!tsdev->input) {
|
|
dev_err(&tsdev->spi->dev, "Unable to allocate input device.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
tsdev->input->name = "mrst_touchscreen";
|
|
snprintf(tsdev->phys, sizeof(tsdev->phys),
|
|
"%s/input0", dev_name(&spi->dev));
|
|
tsdev->input->phys = tsdev->phys;
|
|
tsdev->input->dev.parent = &spi->dev;
|
|
|
|
tsdev->input->id.vendor = tsdev->vendor;
|
|
tsdev->input->id.version = tsdev->rev;
|
|
|
|
tsdev->input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
|
|
tsdev->input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
|
|
|
|
input_set_abs_params(tsdev->input, ABS_X, MIN_X, MIN_Y, 0, 0);
|
|
input_set_abs_params(tsdev->input, ABS_Y, MIN_X, MIN_Y, 0, 0);
|
|
|
|
err = input_register_device(tsdev->input);
|
|
if (err) {
|
|
dev_err(&tsdev->spi->dev, "unable to register input device\n");
|
|
input_free_device(tsdev->input);
|
|
return err;
|
|
}
|
|
|
|
mrstouch_debug("%s", "mrstouch initialized");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
/* Probe function for touch screen driver */
|
|
static int __devinit mrstouch_probe(struct spi_device *mrstouch_spi)
|
|
{
|
|
int err;
|
|
unsigned int myirq;
|
|
struct mrstouch_dev *tsdev;
|
|
|
|
mrstouch_debug("%s(%p)", __func__, mrstouch_spi);
|
|
|
|
mrstouchdevp = NULL;
|
|
myirq = mrstouch_spi->irq;
|
|
|
|
if (!mrstouch_spi->irq) {
|
|
dev_err(&mrstouch_spi->dev, "no interrupt assigned\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
tsdev = kzalloc(sizeof(struct mrstouch_dev), GFP_KERNEL);
|
|
if (!tsdev) {
|
|
dev_err(&mrstouch_spi->dev, "unable to allocate memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
tsdev->irq = myirq;
|
|
mrstouchdevp = tsdev;
|
|
|
|
err = mrstouch_adc_init(tsdev);
|
|
if (err) {
|
|
dev_err(&mrstouch_spi->dev, "ADC init failed\n");
|
|
goto mrstouch_err_free_mem;
|
|
}
|
|
|
|
dev_set_drvdata(&mrstouch_spi->dev, tsdev);
|
|
tsdev->spi = mrstouch_spi;
|
|
|
|
err = ts_input_dev_init(tsdev, mrstouch_spi);
|
|
if (err) {
|
|
dev_err(&tsdev->spi->dev, "ts_input_dev_init failed");
|
|
goto mrstouch_err_free_mem;
|
|
}
|
|
|
|
mutex_init(&tsdev->lock);
|
|
mutex_lock(&tsdev->lock)
|
|
|
|
mrstouch_debug("Requesting IRQ-%d", myirq);
|
|
err = request_irq(myirq, pendet_intr_handler,
|
|
0, "mrstouch", tsdev);
|
|
if (err) {
|
|
dev_err(&tsdev->spi->dev, "unable to allocate irq\n");
|
|
goto mrstouch_err_free_mem;
|
|
}
|
|
|
|
tsdev->pendet_thrd = kthread_run(mrstouch_pendet,
|
|
(void *)tsdev, "pendet handler");
|
|
if (IS_ERR(tsdev->pendet_thrd)) {
|
|
dev_err(&tsdev->spi->dev, "kthread_run failed\n");
|
|
err = PTR_ERR(tsdev->pendet_thrd);
|
|
goto mrstouch_err_free_mem;
|
|
}
|
|
mrstouch_debug("%s", "Driver initialized");
|
|
return 0;
|
|
|
|
mrstouch_err_free_mem:
|
|
kfree(tsdev);
|
|
return err;
|
|
}
|
|
|
|
static int mrstouch_suspend(struct spi_device *spi, pm_message_t msg)
|
|
{
|
|
mrstouch_debug("%s", __func__);
|
|
mrstouchdevp->suspended = 1;
|
|
return 0;
|
|
}
|
|
|
|
static int mrstouch_resume(struct spi_device *spi)
|
|
{
|
|
mrstouch_debug("%s", __func__);
|
|
mrstouchdevp->suspended = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int mrstouch_remove(struct spi_device *spi)
|
|
{
|
|
mrstouch_debug("%s", __func__);
|
|
free_irq(mrstouchdevp->irq, mrstouchdevp);
|
|
input_unregister_device(mrstouchdevp->input);
|
|
input_free_device(mrstouchdevp->input);
|
|
if (mrstouchdevp->pendet_thrd)
|
|
kthread_stop(mrstouchdevp->pendet_thrd);
|
|
kfree(mrstouchdevp);
|
|
return 0;
|
|
}
|
|
|
|
static struct spi_driver mrstouch_driver = {
|
|
.driver = {
|
|
.name = "pmic_touch",
|
|
.bus = &spi_bus_type,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = mrstouch_probe,
|
|
.suspend = mrstouch_suspend,
|
|
.resume = mrstouch_resume,
|
|
.remove = mrstouch_remove,
|
|
};
|
|
|
|
static int __init mrstouch_module_init(void)
|
|
{
|
|
int err;
|
|
|
|
mrstouch_debug("%s", __func__);
|
|
err = spi_register_driver(&mrstouch_driver);
|
|
if (err) {
|
|
mrstouch_debug("%s(%d)", "SPI PENDET failed", err);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit mrstouch_module_exit(void)
|
|
{
|
|
mrstouch_debug("%s", __func__);
|
|
spi_unregister_driver(&mrstouch_driver);
|
|
return;
|
|
}
|
|
|
|
module_init(mrstouch_module_init);
|
|
module_exit(mrstouch_module_exit);
|
|
|
|
MODULE_AUTHOR("Sreedhara Murthy. D.S, sreedhara.ds@intel.com");
|
|
MODULE_DESCRIPTION("Intel Moorestown Resistive Touch Screen Driver");
|
|
MODULE_LICENSE("GPL");
|