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Commit 95b7127c authored by Dmitry Torokhov's avatar Dmitry Torokhov Committed by Dmitry Torokhov
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Staging: mrst_touchscreen - more fixes 

Changes:

 - switch to use threaded IRQ
 - more __devinit/__devexit annotations
 - rely on input core to remove jitter from events
 - global pointer removed
 - NEC/MAXIM/Freescale handling factored out
Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent aff4c343
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Showing with 413 additions and 479 deletions
drivers/staging/mrst-touchscreen/intel-mid-touch.c
View file @ 95b7127c
/*
* intel_mid_touch.c - Intel MID Resistive Touch Screen Driver
* Intel MID Resistive Touch Screen Driver
*
* Copyright (C) 2008 Intel Corp
*
......@@ -15,18 +15,15 @@
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; ifnot, write to the Free Software Foundation, Inc.,
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* Questions/Comments/Bug fixes to Sreedhara (sreedhara.ds@intel.com)
* Ramesh Agarwal (ramesh.agarwal@intel.com)
* Ramesh Agarwal (ramesh.agarwal@intel.com)
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* TODO:
* review conversion of r/m/w sequences
* Replace interrupt mutex abuse
* Kill of mrstouchdevp pointer
*
*/
#include <linux/module.h>
......@@ -38,158 +35,104 @@
#include <linux/spi/spi.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <asm/intel_scu_ipc.h>
/* PMIC Interrupt registers */
#define PMIC_REG_ID1 0x00 /*PMIC ID1 register */
#define PMIC_REG_ID1 0x00 /* PMIC ID1 register */
/* PMIC Interrupt registers */
#define PMIC_REG_INT 0x04 /*PMIC interrupt register */
#define PMIC_REG_MINT 0x05 /*PMIC interrupt mask register */
#define PMIC_REG_INT 0x04 /* PMIC interrupt register */
#define PMIC_REG_MINT 0x05 /* PMIC interrupt mask register */
/* ADC Interrupt registers */
#define PMIC_REG_ADCINT 0x5F /*ADC interrupt register */
#define PMIC_REG_MADCINT 0x60 /*ADC interrupt mask register */
#define PMIC_REG_ADCINT 0x5F /* ADC interrupt register */
#define PMIC_REG_MADCINT 0x60 /* ADC interrupt mask register */
/* ADC Control registers */
#define PMIC_REG_ADCCNTL1 0x61 /*ADC control register */
#define PMIC_REG_ADCCNTL1 0x61 /* ADC control register */
/* ADC Channel Selection registers */
#define PMICADDR0 0xA4
#define END_OF_CHANNEL 0x1F
#define PMICADDR0 0xA4
#define END_OF_CHANNEL 0x1F
/* ADC Result register */
#define PMIC_REG_ADCSNS0H 0x64
#define PMIC_REG_ADCSNS0H 0x64
/* ADC channels for touch screen */
#define MRST_TS_CHAN10 0xA /* Touch screen X+ connection */
#define MRST_TS_CHAN11 0xB /* Touch screen X- connection */
#define MRST_TS_CHAN12 0xC /* Touch screen Y+ connection */
#define MRST_TS_CHAN13 0xD /* Touch screen Y- connection */
/* Touch screen coordinate constants */
#define TOUCH_PRESSURE 50
#define TOUCH_PRESSURE_FS 100
#define XMOVE_LIMIT 5
#define YMOVE_LIMIT 5
#define XYMOVE_CNT 3
#define MAX_10BIT ((1<<10)-1)
#define MRST_TS_CHAN10 0xA /* Touch screen X+ connection */
#define MRST_TS_CHAN11 0xB /* Touch screen X- connection */
#define MRST_TS_CHAN12 0xC /* Touch screen Y+ connection */
#define MRST_TS_CHAN13 0xD /* Touch screen Y- connection */
/* Touch screen channel BIAS constants */
#define XBIAS 0x20
#define YBIAS 0x40
#define ZBIAS 0x80
#define MRST_XBIAS 0x20
#define MRST_YBIAS 0x40
#define MRST_ZBIAS 0x80
/* Touch screen coordinates */
#define MIN_X 10
#define MAX_X 1024
#define MIN_Y 10
#define MAX_Y 1024
#define MIN_P 0
#define MAX_P TOUCH_PRESSURE_FS
#define WAIT_ADC_COMPLETION 10
#define MRST_X_MIN 10
#define MRST_X_MAX 1024
#define MRST_X_FUZZ 5
#define MRST_Y_MIN 10
#define MRST_Y_MAX 1024
#define MRST_Y_FUZZ 5
#define MRST_PRESSURE_MIN 0
#define MRST_PRESSURE_NOMINAL 50
#define MRST_PRESSURE_MAX 100
#define WAIT_ADC_COMPLETION 10 /* msec */
/* PMIC ADC round robin delays */
#define ADC_LOOP_DELAY0 0x0 /* Continuous loop */
#define ADC_LOOP_DELAY1 0x1 /* 4.5 ms approximate */
#define ADC_LOOP_DELAY0 0x0 /* Continuous loop */
#define ADC_LOOP_DELAY1 0x1 /* 4.5 ms approximate */
/* PMIC Vendor Identifiers */
#define PMIC_VENDOR_FS 0 /* PMIC vendor FreeScale */
#define PMIC_VENDOR_MAXIM 1 /* PMIC vendor MAXIM */
#define PMIC_VENDOR_NEC 2 /* PMIC vendor NEC */
#define MRSTOUCH_MAX_CHANNELS 32 /* Maximum ADC channels */
#define PMIC_VENDOR_FS 0 /* PMIC vendor FreeScale */
#define PMIC_VENDOR_MAXIM 1 /* PMIC vendor MAXIM */
#define PMIC_VENDOR_NEC 2 /* PMIC vendor NEC */
#define MRSTOUCH_MAX_CHANNELS 32 /* Maximum ADC channels */
/* Touch screen device structure */
struct mrstouch_dev {
struct spi_device *spi; /* SPI device associated with touch screen */
struct input_dev *input; /* input device for touchscreen*/
char phys[32]; /* Device name */
struct task_struct *pendet_thrd; /* PENDET interrupt handler */
struct mutex lock; /* Sync between interrupt and PENDET handler */
bool busy; /* Busy flag */
u16 asr; /* Address selection register */
int irq; /* Touch screen IRQ # */
uint vendor; /* PMIC vendor */
uint rev; /* PMIC revision */
u16 x; /* X coordinate */
u16 y; /* Y coordinate */
bool pendown; /* PEN position */
} ;
/* Global Pointer to Touch screen device */
static struct mrstouch_dev *mrstouchdevp;
struct spi_device *spi;
struct input_dev *input;
char phys[32];
u16 asr; /* Address selection register */
int irq;
unsigned int vendor; /* PMIC vendor */
unsigned int rev; /* PMIC revision */
int (*read_prepare)(struct mrstouch_dev *tsdev);
int (*read)(struct mrstouch_dev *tsdev, u16 *x, u16 *y, u16 *z);
int (*read_finish)(struct mrstouch_dev *tsdev);
};
/* Utility to read PMIC ID */
static int mrstouch_pmic_id(uint *vendor, uint *rev)
/*************************** NEC and Maxim Interface ************************/
static int mrstouch_nec_adc_read_prepare(struct mrstouch_dev *tsdev)
{
u16 reg;
int err;
u8 r;
err = intel_scu_ipc_ioread8(PMIC_REG_ID1, &r);
err = intel_scu_ipc_ioread16(PMIC_REG_MADCINT, &reg);
if (err)
return err;
*vendor = r & 0x7;
*rev = (r >> 3) & 0x7;
reg &= 0xDFFF; /* Disable pendet */
return 0;
/* Set MADCINT and update ADCCNTL1 (next reg byte) */
return intel_scu_ipc_iowrite16(PMIC_REG_MADCINT, reg);
}
/*
* Parse ADC channels to find end of the channel configured by other ADC user
* NEC and MAXIM requires 4 channels and FreeScale needs 18 channels
* Enables PENDET interrupt.
*/
static int mrstouch_chan_parse(struct mrstouch_dev *tsdev)
{
int err, i, j, found;
u32 r32;
found = -1;
for (i = 0; i < MRSTOUCH_MAX_CHANNELS; i++) {
if (found >= 0)
break;
err = intel_scu_ipc_ioread32(PMICADDR0, &r32);
if (err)
return err;
for (j = 0; j < 32; j+= 8) {
if (((r32 >> j) & 0xFF) == END_OF_CHANNEL) {
found = i;
break;
}
}
}
if (found < 0)
return 0;
if (tsdev->vendor == PMIC_VENDOR_FS) {
if (found && found > (MRSTOUCH_MAX_CHANNELS - 18))
return -ENOSPC;
} else {
if (found && found > (MRSTOUCH_MAX_CHANNELS - 4))
return -ENOSPC;
}
return found;
}
/* Utility to enable/disable pendet.
* pendet set to true enables PENDET interrupt
* pendet set to false disables PENDET interrupt
* Also clears RND mask bit
*/
static int pendet_enable(struct mrstouch_dev *tsdev, bool pendet)
static int mrstouch_nec_adc_read_finish(struct mrstouch_dev *tsdev)
{
u16 reg;
u8 r;
u8 pendet_enabled = 0;
u8 pendet_enabled;
int retry = 0;
int err;
......@@ -197,15 +140,12 @@ static int pendet_enable(struct mrstouch_dev *tsdev, bool pendet)
if (err)
return err;
if (pendet) {
reg &= ~0x0005;
reg |= 0x2000; /* Enable pendet */
} else
reg &= 0xDFFF; /* Disable pendet */
reg &= ~0x0005;
reg |= 0x2000; /* Enable pendet */
/* Set MADCINT and update ADCCNTL1 (next reg byte) */
err = intel_scu_ipc_iowrite16(PMIC_REG_MADCINT, reg);
if (!pendet || err)
if (err)
return err;
/*
......@@ -213,31 +153,36 @@ static int pendet_enable(struct mrstouch_dev *tsdev, bool pendet)
* the PMIC register value is not updated. Retry few iterations
* to enable pendet.
*/
do {
err = intel_scu_ipc_ioread8(PMIC_REG_ADCCNTL1, &r);
if (err)
return err;
err = intel_scu_ipc_ioread8(PMIC_REG_ADCCNTL1, &r);
pendet_enabled = (r >> 5) & 0x01;
pendet_enabled = (r >> 5) & 0x01;
retry = 0;
while (!err && !pendet_enabled) {
retry++;
msleep(10);
err = intel_scu_ipc_iowrite8(PMIC_REG_ADCCNTL1, reg >> 8);
if (err)
break;
err = intel_scu_ipc_ioread8(PMIC_REG_ADCCNTL1, &r);
if (err == 0)
pendet_enabled = (r >> 5) & 0x01;
if (retry >= 10) {
dev_err(&tsdev->spi->dev, "Touch screen disabled.\n");
return -EIO;
if (!pendet_enabled) {
if (++retry >= 10) {
dev_err(&tsdev->spi->dev,
"Touch screen disabled.\n");
return -EIO;
}
msleep(10);
err = intel_scu_ipc_iowrite8(PMIC_REG_ADCCNTL1,
reg >> 8);
if (err)
return err;
}
}
} while (!pendet_enabled);
return 0;
}
/* To read PMIC ADC touch screen result
* Reads ADC storage registers for higher 7 and lower 3 bits
* converts the two readings to single value and turns off gain bit
/*
* Reads PMIC ADC touch screen result
* Reads ADC storage registers for higher 7 and lower 3 bits and
* converts the two readings into a single value and turns off gain bit
*/
static int mrstouch_ts_chan_read(u16 offset, u16 chan, u16 *vp, u16 *vm)
{
......@@ -269,187 +214,93 @@ static int mrstouch_ts_chan_read(u16 offset, u16 chan, u16 *vp, u16 *vm)
return 0;
}
/* To configure touch screen channels
* Writes touch screen channels to ADC address selection registers
/*
* Enables X, Y and Z bias values
* Enables YPYM for X channels and XPXM for Y channels
*/
static int mrstouch_ts_chan_set(uint offset)
static int mrstouch_ts_bias_set(uint offset, uint bias)
{
int count;
u16 chan;
u16 reg[5];
u8 data[5];
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] = MRST_TS_CHAN10 + count;
}
reg[count] = chan;
data[count] = END_OF_CHANNEL;
return intel_scu_ipc_writev(reg, data, 5);
}
/* Initialize ADC */
static int mrstouch_adc_init(struct mrstouch_dev *tsdev)
{
int err, start;
u8 ra, rm;
err = mrstouch_pmic_id(&tsdev->vendor, &tsdev->rev);
if (err) {
dev_err(&tsdev->spi->dev, "Unable to read PMIC id\n");
return err;
}
start = mrstouch_chan_parse(tsdev);
if (start < 0) {
dev_err(&tsdev->spi->dev, "Unable to parse channels\n");
return start;
}
tsdev->asr = start;
/* ADC power on, start, enable PENDET and set loop delay
* ADC loop delay is set to 4.5 ms approximately
* Loop delay more than this results in jitter in adc readings
* Setting loop delay to 0 (continous loop) in MAXIM stops PENDET
* interrupt generation sometimes.
*/
if (tsdev->vendor == PMIC_VENDOR_FS) {
ra = 0xE0 | ADC_LOOP_DELAY0;
rm = 0x5;
} else {
/* NEC and MAXIm not consistent with loop delay 0 */
ra = 0xE0 | ADC_LOOP_DELAY1;
rm = 0x0;
/* configure touch screen channels */
err = mrstouch_ts_chan_set(tsdev->asr);
if (err)
return err;
}
err = intel_scu_ipc_update_register(PMIC_REG_ADCCNTL1, ra, 0xE7);
if (err == 0)
err = intel_scu_ipc_update_register(PMIC_REG_MADCINT, rm, 0x03);
return err;
}
/* Reports x,y coordinates to event subsystem */
static void mrstouch_report_xy(struct mrstouch_dev *tsdev, u16 x, u16 y, u16 z)
{
int xdiff, ydiff;
if (tsdev->pendown && z <= TOUCH_PRESSURE) {
/* Pen removed, report button release */
input_report_key(tsdev->input, BTN_TOUCH, 0);
tsdev->pendown = false;
}
xdiff = abs(x - tsdev->x);
ydiff = abs(y - tsdev->y);
/*
if x and y values changes for XYMOVE_CNT readings it is considered
as stylus is moving. This is required to differentiate between stylus
movement and jitter
*/
if (x < MIN_X || x > MAX_X || y < MIN_Y || y > MAX_Y) {
/* Spurious values, release button if touched and return */
if (tsdev->pendown) {
input_report_key(tsdev->input, BTN_TOUCH, 0);
tsdev->pendown = false;
}
return;
} else if (xdiff >= XMOVE_LIMIT || ydiff >= YMOVE_LIMIT) {
tsdev->x = x;
tsdev->y = y;
input_report_abs(tsdev->input, ABS_X, x);
input_report_abs(tsdev->input, ABS_Y, y);
input_report_abs(tsdev->input, ABS_PRESSURE, z);
input_sync(tsdev->input);
data[count] = bias | (start + count);
}
if (!tsdev->pendown && z > TOUCH_PRESSURE) {
/* Pen touched, report button touch */
input_report_key(tsdev->input, BTN_TOUCH, 1);
tsdev->pendown = true;
}
}
/* Utility to start ADC, used by freescale handler */
static int pendet_mask(void)
{
return intel_scu_ipc_update_register(PMIC_REG_MADCINT, 0x02, 0x02);
}
/* Utility to stop ADC, used by freescale handler */
static int pendet_umask(void)
{
return intel_scu_ipc_update_register(PMIC_REG_MADCINT, 0x00, 0x02);
return intel_scu_ipc_writev(reg, data, 4);
}
/* Utility to read ADC, used by freescale handler */
static int mrstouch_pmic_fs_adc_read(struct mrstouch_dev *tsdev)
/* To read touch screen channel values */
static int mrstouch_nec_adc_read(struct mrstouch_dev *tsdev,
u16 *x, u16 *y, u16 *z)
{
int err;
u16 x, y, z, result;
u16 reg[4];
u8 data[4];
u16 xm, ym, zm;
result = PMIC_REG_ADCSNS0H + tsdev->asr;
/* configure Y bias for X channels */
err = mrstouch_ts_bias_set(tsdev->asr, MRST_YBIAS);
if (err)
goto ipc_error;
reg[0] = result + 4;
reg[1] = result + 5;
reg[2] = result + 16;
reg[3] = result + 17;
msleep(WAIT_ADC_COMPLETION);
err = intel_scu_ipc_readv(reg, data, 4);
/* read x+ and x- channels */
err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN10, x, &xm);
if (err)
goto ipc_error;
x = data[0] << 3; /* Higher 7 bits */
x |= data[1] & 0x7; /* Lower 3 bits */
x &= 0x3FF;
/* configure x bias for y channels */
err = mrstouch_ts_bias_set(tsdev->asr, MRST_XBIAS);
if (err)
goto ipc_error;
y = data[2] << 3; /* Higher 7 bits */
y |= data[3] & 0x7; /* Lower 3 bits */
y &= 0x3FF;
msleep(WAIT_ADC_COMPLETION);
/* Read Z value */
reg[0] = result + 28;
reg[1] = result + 29;
/* read y+ and y- channels */
err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN12, y, &ym);
if (err)
goto ipc_error;
err = intel_scu_ipc_readv(reg, data, 4);
/* configure z bias for x and y channels */
err = mrstouch_ts_bias_set(tsdev->asr, MRST_ZBIAS);
if (err)
goto ipc_error;
z = data[0] << 3; /* Higher 7 bits */
z |= data[1] & 0x7; /* Lower 3 bits */
z &= 0x3FF;
msleep(WAIT_ADC_COMPLETION);
/* read z+ and z- channels */
err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN10, z, &zm);
if (err)
goto ipc_error;
mrstouch_report_xy(tsdev, x, y, z);
return 0;
ipc_error:
dev_err(&tsdev->spi->dev, "ipc error during fs_adc read\n");
dev_err(&tsdev->spi->dev, "ipc error during adc read\n");
return err;
}
/* To handle free scale pmic pendet interrupt */
static int pmic0_pendet(void *dev_id)
/*************************** Freescale Interface ************************/
static int mrstouch_fs_adc_read_prepare(struct mrstouch_dev *tsdev)
{
int err, count;
u16 chan;
unsigned int touched;
struct mrstouch_dev *tsdev = (struct mrstouch_dev *)dev_id;
u16 reg[5];
u8 data[5];
/* Stop the ADC */
err = intel_scu_ipc_update_register(PMIC_REG_MADCINT, 0x00, 0x02);
if (err)
goto ipc_error;
chan = PMICADDR0 + tsdev->asr;
/* Set X BIAS */
......@@ -487,16 +338,65 @@ static int pmic0_pendet(void *dev_id)
msleep(WAIT_ADC_COMPLETION);
/*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);
}
return 0;
ipc_error:
dev_err(&tsdev->spi->dev, "ipc error during %s\n", __func__);
return err;
}
static int mrstouch_fs_adc_read(struct mrstouch_dev *tsdev,
u16 *x, u16 *y, u16 *z)
{
int err;
u16 result;
u16 reg[4];
u8 data[4];
result = PMIC_REG_ADCSNS0H + tsdev->asr;
reg[0] = result + 4;
reg[1] = result + 5;
reg[2] = result + 16;
reg[3] = result + 17;
err = intel_scu_ipc_readv(reg, data, 4);
if (err)
goto ipc_error;
*x = data[0] << 3; /* Higher 7 bits */
*x |= data[1] & 0x7; /* Lower 3 bits */
*x &= 0x3FF;
*y = data[2] << 3; /* Higher 7 bits */
*y |= data[3] & 0x7; /* Lower 3 bits */
*y &= 0x3FF;
/* Read Z value */
reg[0] = result + 28;
reg[1] = result + 29;
err = intel_scu_ipc_readv(reg, data, 4);
if (err)
goto ipc_error;
*z = data[0] << 3; /* Higher 7 bits */
*z |= data[1] & 0x7; /* Lower 3 bits */
*z &= 0x3FF;
return 0;
ipc_error:
dev_err(&tsdev->spi->dev, "ipc error during %s\n", __func__);
return err;
}
static int mrstouch_fs_adc_read_finish(struct mrstouch_dev *tsdev)
{
int err, count;
u16 chan;
u16 reg[5];
u8 data[5];
/* Clear all TS channels */
chan = PMICADDR0 + tsdev->asr;
......@@ -520,252 +420,296 @@ static int pmic0_pendet(void *dev_id)
if (err)
goto ipc_error;
/* Start ADC */
err = intel_scu_ipc_update_register(PMIC_REG_MADCINT, 0x02, 0x02);
if (err)
goto ipc_error;
return 0;
ipc_error:
dev_err(&tsdev->spi->dev, "ipc error during pendet\n");
dev_err(&tsdev->spi->dev, "ipc error during %s\n", __func__);
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)
static void mrstouch_report_event(struct input_dev *input,
unsigned int x, unsigned int y, unsigned int z)
{
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);
if (z > MRST_PRESSURE_NOMINAL) {
/* Pen touched, report button touch and coordinates */
input_report_key(input, BTN_TOUCH, 1);
input_report_abs(input, ABS_X, x);
input_report_abs(input, ABS_Y, y);
} else {
input_report_key(input, BTN_TOUCH, 0);
}
return intel_scu_ipc_writev(reg, data, 4);
input_report_abs(input, ABS_PRESSURE, z);
input_sync(input);
}
/* To read touch screen channel values */
static int mrstouch_adc_read(struct mrstouch_dev *tsdev)
/* PENDET interrupt handler */
static irqreturn_t mrstouch_pendet_irq(int irq, void *dev_id)
{
int err;
u16 xp, xm, yp, ym, zp, zm;
struct mrstouch_dev *tsdev = dev_id;
u16 x, y, z;
/* configure Y bias for X channels */
err = mrstouch_ts_bias_set(tsdev->asr, YBIAS);
if (err)
goto ipc_error;
msleep(WAIT_ADC_COMPLETION);
/*
* Should we lower thread priority? Probably not, since we are
* not spinning but sleeping...
*/
/* read x+ and x- channels */
err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN10, &xp, &xm);
if (err)
goto ipc_error;
if (tsdev->read_prepare(tsdev))
goto out;
/* configure x bias for y channels */
err = mrstouch_ts_bias_set(tsdev->asr, XBIAS);
if (err)
goto ipc_error;
do {
if (tsdev->read(tsdev, &x, &y, &z))
break;
msleep(WAIT_ADC_COMPLETION);
mrstouch_report_event(tsdev->input, x, y, z);
} while (z > MRST_PRESSURE_NOMINAL);
/* read y+ and y- channels */
err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN12, &yp, &ym);
if (err)
goto ipc_error;
tsdev->read_finish(tsdev);
/* configure z bias for x and y channels */
err = mrstouch_ts_bias_set(tsdev->asr, ZBIAS);
if (err)
goto ipc_error;
out:
return IRQ_HANDLED;
}
msleep(WAIT_ADC_COMPLETION);
/* Utility to read PMIC ID */
static int __devinit mrstouch_read_pmic_id(uint *vendor, uint *rev)
{
int err;
u8 r;
/* read z+ and z- channels */
err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN10, &zp, &zm);
err = intel_scu_ipc_ioread8(PMIC_REG_ID1, &r);
if (err)
goto ipc_error;
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;
}
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;
*vendor = r & 0x7;
*rev = (r >> 3) & 0x7;
/* read touch screen channels till pen removed */
do {
touched = mrstouch_adc_read(tsdev);
} while (touched > TOUCH_PRESSURE);
return 0;
}
/* Handler to process PENDET interrupt */
int mrstouch_pendet(void *data)
/*
* Parse ADC channels to find end of the channel configured by other ADC user
* NEC and MAXIM requires 4 channels and FreeScale needs 18 channels
*/
static int __devinit mrstouch_chan_parse(struct mrstouch_dev *tsdev)
{
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;
}
int err, i, j, found;
u32 r32;
if (tsdev->busy)
return 0;
found = -1;
tsdev->busy = true;
for (i = 0; i < MRSTOUCH_MAX_CHANNELS; i++) {
if (found >= 0)
break;
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);
err = intel_scu_ipc_ioread32(PMICADDR0, &r32);
if (err)
return err;
tsdev->busy = false;
for (j = 0; j < 32; j+= 8) {
if (((r32 >> j) & 0xFF) == END_OF_CHANNEL) {
found = i;
break;
}
}
}
if (found < 0)
return 0;
if (tsdev->vendor == PMIC_VENDOR_FS) {
if (found && found > (MRSTOUCH_MAX_CHANNELS - 18))
return -ENOSPC;
} else {
if (found && found > (MRSTOUCH_MAX_CHANNELS - 4))
return -ENOSPC;
}
return 0;
return found;
}
/* PENDET interrupt handler */
static irqreturn_t pendet_intr_handler(int irq, void *handle)
/*
* Writes touch screen channels to ADC address selection registers
*/
static int __devinit mrstouch_ts_chan_set(uint offset)
{
struct mrstouch_dev *tsdev = (struct mrstouch_dev *)handle;
int count;
u16 chan;
u16 reg[5];
u8 data[5];
mutex_unlock(&tsdev->lock);
return IRQ_HANDLED;
chan = PMICADDR0 + offset;
for (count = 0; count <= 3; count++) {
reg[count] = chan++;
data[count] = MRST_TS_CHAN10 + count;
}
reg[count] = chan;
data[count] = END_OF_CHANNEL;
return intel_scu_ipc_writev(reg, data, 5);
}
/* Intializes input device and registers with input subsystem */
static int ts_input_dev_init(struct mrstouch_dev *tsdev, struct spi_device *spi)
/* Initialize ADC */
static int __devinit mrstouch_adc_init(struct mrstouch_dev *tsdev)
{
int err = 0;
int err, start;
u8 ra, rm;
tsdev->input = input_allocate_device();
if (!tsdev->input) {
dev_err(&tsdev->spi->dev, "Unable to allocate input device.\n");
return -ENOMEM;
err = mrstouch_read_pmic_id(&tsdev->vendor, &tsdev->rev);
if (err) {
dev_err(&tsdev->spi->dev, "Unable to read PMIC id\n");
return err;
}
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;
switch (tsdev->vendor) {
case PMIC_VENDOR_NEC:
case PMIC_VENDOR_MAXIM:
tsdev->read_prepare = mrstouch_nec_adc_read_prepare;
tsdev->read = mrstouch_nec_adc_read;
tsdev->read_finish = mrstouch_nec_adc_read_finish;
break;
case PMIC_VENDOR_FS:
tsdev->read_prepare = mrstouch_fs_adc_read_prepare;
tsdev->read = mrstouch_fs_adc_read;
tsdev->read_finish = mrstouch_fs_adc_read_finish;
break;
default:
dev_err(&tsdev->spi->dev,
"Unsupported touchscreen: %d\n", tsdev->vendor);
return -ENXIO;
}
tsdev->input->id.vendor = tsdev->vendor;
tsdev->input->id.version = tsdev->rev;
start = mrstouch_chan_parse(tsdev);
if (start < 0) {
dev_err(&tsdev->spi->dev, "Unable to parse channels\n");
return start;
}
tsdev->input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
tsdev->input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
tsdev->asr = start;
input_set_abs_params(tsdev->input, ABS_X, MIN_X, MAX_X, 0, 0);
input_set_abs_params(tsdev->input, ABS_Y, MIN_Y, MAX_Y, 0, 0);
input_set_abs_params(tsdev->input, ABS_PRESSURE, MIN_P, MAX_P, 0, 0);
/*
* ADC power on, start, enable PENDET and set loop delay
* ADC loop delay is set to 4.5 ms approximately
* Loop delay more than this results in jitter in adc readings
* Setting loop delay to 0 (continous loop) in MAXIM stops PENDET
* interrupt generation sometimes.
*/
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;
if (tsdev->vendor == PMIC_VENDOR_FS) {
ra = 0xE0 | ADC_LOOP_DELAY0;
rm = 0x5;
} else {
/* NEC and MAXIm not consistent with loop delay 0 */
ra = 0xE0 | ADC_LOOP_DELAY1;
rm = 0x0;
/* configure touch screen channels */
err = mrstouch_ts_chan_set(tsdev->asr);
if (err)
return err;
}
return 0;
err = intel_scu_ipc_update_register(PMIC_REG_ADCCNTL1, ra, 0xE7);
if (err)
return err;
err = intel_scu_ipc_update_register(PMIC_REG_MADCINT, rm, 0x03);
if (err)
return err;
return 0;
}
/* Probe function for touch screen driver */
static int __devinit mrstouch_probe(struct spi_device *mrstouch_spi)
static int __devinit mrstouch_probe(struct spi_device *spi)
{
int err;
unsigned int myirq;
struct mrstouch_dev *tsdev;
struct input_dev *input;
int err;
mrstouchdevp = NULL;
myirq = mrstouch_spi->irq;
if (!mrstouch_spi->irq) {
dev_err(&mrstouch_spi->dev, "no interrupt assigned\n");
if (!spi->irq) {
dev_err(&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;
input = input_allocate_device();
if (!tsdev || !input) {
dev_err(&spi->dev, "unable to allocate memory\n");
err = -ENOMEM;
goto err_free_mem;
}
tsdev->irq = myirq;
mrstouchdevp = tsdev;
tsdev->spi = spi;
tsdev->input = input;
tsdev->irq = spi->irq;
snprintf(tsdev->phys, sizeof(tsdev->phys),
"%s/input0", dev_name(&spi->dev));
err = mrstouch_adc_init(tsdev);
if (err) {
dev_err(&mrstouch_spi->dev, "ADC init failed\n");
goto mrstouch_err_free_mem;
dev_err(&spi->dev, "ADC initialization failed\n");
goto err_free_mem;
}
dev_set_drvdata(&mrstouch_spi->dev, tsdev);
tsdev->spi = mrstouch_spi;
input->name = "mrst_touchscreen";
input->phys = tsdev->phys;
input->dev.parent = &spi->dev;
err = ts_input_dev_init(tsdev, mrstouch_spi);
if (err) {
dev_err(&tsdev->spi->dev, "ts_input_dev_init failed");
goto mrstouch_err_free_dev;
}
input->id.vendor = tsdev->vendor;
input->id.version = tsdev->rev;
mutex_init(&tsdev->lock);
mutex_lock(&tsdev->lock);
input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
err = request_irq(myirq, pendet_intr_handler,
0, "mrstouch", tsdev);
input_set_abs_params(tsdev->input, ABS_X,
MRST_X_MIN, MRST_X_MAX, MRST_X_FUZZ, 0);
input_set_abs_params(tsdev->input, ABS_Y,
MRST_Y_MIN, MRST_Y_MAX, MRST_Y_FUZZ, 0);
input_set_abs_params(tsdev->input, ABS_PRESSURE,
MRST_PRESSURE_MIN, MRST_PRESSURE_MAX, 0, 0);
err = request_threaded_irq(tsdev->irq, NULL, mrstouch_pendet_irq,
0, "mrstouch", tsdev);
if (err) {
dev_err(&tsdev->spi->dev, "unable to allocate irq\n");
goto mrstouch_err_free_dev;
goto 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_irq;
err = input_register_device(tsdev->input);
if (err) {
dev_err(&tsdev->spi->dev, "unable to register input device\n");
goto err_free_irq;
}
spi_set_drvdata(spi, tsdev);
return 0;
mrstouch_err_free_irq:
free_irq(myirq, tsdev);
mrstouch_err_free_dev:
input_unregister_device(tsdev->input);
mrstouch_err_free_mem:
err_free_irq:
free_irq(tsdev->irq, tsdev);
err_free_mem:
input_free_device(input);
kfree(tsdev);
return err;
}
static int mrstouch_remove(struct spi_device *spi)
static int __devexit mrstouch_remove(struct spi_device *spi)
{
free_irq(mrstouchdevp->irq, mrstouchdevp);
if (mrstouchdevp->pendet_thrd)
kthread_stop(mrstouchdevp->pendet_thrd);
input_unregister_device(mrstouchdevp->input);
kfree(mrstouchdevp);
struct mrstouch_dev *tsdev = spi_get_drvdata(spi);
free_irq(tsdev->irq, tsdev);
input_unregister_device(tsdev->input);
kfree(tsdev);
spi_set_drvdata(spi, NULL);
return 0;
}
......@@ -776,30 +720,20 @@ static struct spi_driver mrstouch_driver = {
.owner = THIS_MODULE,
},
.probe = mrstouch_probe,
.remove = mrstouch_remove,
.remove = __devexit_p(mrstouch_remove),
};
static int __init mrstouch_module_init(void)
static int __init mrstouch_init(void)
{
int err;
err = spi_register_driver(&mrstouch_driver);
if (err) {
printk(KERN_ERR "%s(%d)", "SPI PENDET failed", err);
return err;;
}
return 0;
return spi_register_driver(&mrstouch_driver);
}
module_init(mrstouch_init);
static void __exit mrstouch_module_exit(void)
static void __exit mrstouch_exit(void)
{
spi_unregister_driver(&mrstouch_driver);
return;
}
module_init(mrstouch_module_init);
module_exit(mrstouch_module_exit);
module_exit(mrstouch_exit);
MODULE_AUTHOR("Sreedhara Murthy. D.S, sreedhara.ds@intel.com");
MODULE_DESCRIPTION("Intel Moorestown Resistive Touch Screen Driver");
......
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