/*
- * intel_mid_touch.c - Intel MID Resistive Touch Screen Driver
+ * Intel MID Resistive Touch Screen Driver
*
* Copyright (C) 2008 Intel Corp
*
* 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>
#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, ®);
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;
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;
/*
* 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)
{
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 */
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;
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;
}
.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");
git.openpandora.org / pandora-kernel.git / commitdiff