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Diffstat (limited to 'drivers/staging/mrst-touchscreen/intel-mid-touch.c')
-rw-r--r--drivers/staging/mrst-touchscreen/intel-mid-touch.c864
1 files changed, 864 insertions, 0 deletions
diff --git a/drivers/staging/mrst-touchscreen/intel-mid-touch.c b/drivers/staging/mrst-touchscreen/intel-mid-touch.c
new file mode 100644
index 00000000000..1db00975a59
--- /dev/null
+++ b/drivers/staging/mrst-touchscreen/intel-mid-touch.c
@@ -0,0 +1,864 @@
+/*
+ * intel_mid_touch.c - Intel MID Resistive Touch Screen Driver
+ *
+ * Copyright (C) 2008 Intel Corp
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * 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.,
+ * 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)
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * TODO:
+ * kill off mrstouch_debug eventually
+ * review conversion of r/m/w sequences
+ * Replace interrupt mutex abuse
+ * Kill of mrstouchdevp pointer
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/err.h>
+#include <linux/param.h>
+#include <linux/spi/spi.h>
+#include <linux/irq.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+#include <asm/intel_scu_ipc.h>
+
+
+#if defined(MRSTOUCH_DEBUG)
+#define mrstouch_debug(fmt, args...)\
+ do { \
+ printk(KERN_DEBUG "\n[MRSTOUCH(%d)] - ", __LINE__); \
+ printk(KERN_DEBUG fmt, ##args); \
+ } while (0);
+#else
+#define mrstouch_debug(fmt, args...)
+#endif
+
+/* PMIC Interrupt registers */
+#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 */
+
+/* ADC Interrupt registers */
+#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 */
+
+/* ADC Channel Selection registers */
+#define PMICADDR0 0xA4
+#define END_OF_CHANNEL 0x1F
+
+/* ADC Result register */
+#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)
+
+/* Touch screen channel BIAS constants */
+#define XBIAS 0x20
+#define YBIAS 0x40
+#define ZBIAS 0x80
+
+/* Touch screen coordinates */
+#define MIN_X 10
+#define MAX_X 1024
+#define MIN_Y 10
+#define MAX_Y 1024
+#define WAIT_ADC_COMPLETION 10
+
+/* PMIC ADC round robin delays */
+#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 */
+
+/* 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 */
+ bool suspended; /* Device suspended status */
+ bool disabled; /* Device disabled status */
+ u16 x; /* X coordinate */
+ u16 y; /* Y coordinate */
+ bool pendown; /* PEN position */
+} ;
+
+
+/* Global Pointer to Touch screen device */
+static struct mrstouch_dev *mrstouchdevp;
+
+/* Utility to read PMIC ID */
+static int mrstouch_pmic_id(uint *vendor, uint *rev)
+{
+ int err;
+ u8 r;
+
+ err = intel_scu_ipc_ioread8(PMIC_REG_ID1, &r);
+ if (err)
+ return err;
+
+ *vendor = r & 0x7;
+ *rev = (r >> 3) & 0x7;
+
+ return 0;
+}
+
+/*
+ * 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 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)
+{
+ u16 reg;
+ u8 r;
+ u8 pendet_enabled = 0;
+ int retry = 0;
+ int err;
+
+ err = intel_scu_ipc_ioread16(PMIC_REG_MADCINT, &reg);
+ if (err)
+ return err;
+
+ if (pendet) {
+ reg &= ~0x0005;
+ reg |= 0x2000; /* Enable pendet */
+ } else
+ reg &= 0xDFFF; /* Disable pendet */
+
+ /* Set MADCINT and update ADCCNTL1 (next reg byte) */
+ err = intel_scu_ipc_iowrite16(PMIC_REG_MADCINT, reg);
+ if (!pendet || err)
+ return err;
+
+ /*
+ * Sometimes even after the register write succeeds
+ * the PMIC register value is not updated. Retry few iterations
+ * to enable pendet.
+ */
+
+ err = intel_scu_ipc_ioread8(PMIC_REG_ADCCNTL1, &r);
+ 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;
+ }
+ }
+ 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
+ */
+static int mrstouch_ts_chan_read(u16 offset, u16 chan, u16 *vp, u16 *vm)
+{
+ int err;
+ u16 result;
+ u32 res;
+
+ result = PMIC_REG_ADCSNS0H + offset;
+
+ if (chan == MRST_TS_CHAN12)
+ result += 4;
+
+ err = intel_scu_ipc_ioread32(result, &res);
+ if (err)
+ return err;
+
+ /* Mash the bits up */
+
+ *vp = (res & 0xFF) << 3; /* Highest 7 bits */
+ *vp |= (res >> 8) & 0x07; /* Lower 3 bits */
+ *vp &= 0x3FF;
+
+ res >>= 16;
+
+ *vm = (res & 0xFF) << 3; /* Highest 7 bits */
+ *vm |= (res >> 8) & 0x07; /* Lower 3 bits */
+ *vm &= 0x3FF;
+
+ return 0;
+}
+
+/* To configure touch screen channels
+ * Writes touch screen channels to ADC address selection registers
+ */
+static int mrstouch_ts_chan_set(uint offset)
+{
+ int count;
+ u16 chan;
+ u16 reg[5];
+ u8 data[5];
+
+ 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);
+}
+
+/* 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;
+
+ mrstouch_debug("Channel offset(%d): 0x%X\n", tsdev->asr, tsdev->vendor);
+
+ /* 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 */
+ mrstouch_debug("BTN REL(%d)", z);
+ 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) {
+ mrstouch_debug("BTN REL(%d)", z);
+ 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_sync(tsdev->input);
+ }
+
+
+ if (!tsdev->pendown && z > TOUCH_PRESSURE) {
+ /* Pen touched, report button touch */
+ mrstouch_debug("BTN TCH(%d, %d, %d)", x, y, z);
+ 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);
+}
+
+/* Utility to read ADC, used by freescale handler */
+static int mrstouch_pmic_fs_adc_read(struct mrstouch_dev *tsdev)
+{
+ int err;
+ u16 x, y, z, 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;
+
+#if defined(MRSTOUCH_PRINT_XYZP)
+ mrstouch_debug("X: %d, Y: %d, Z: %d", x, y, z);
+#endif
+
+ if (z >= TOUCH_PRESSURE_FS) {
+ mrstouch_report_xy(tsdev, x, y, TOUCH_PRESSURE - 1); /* Pen Removed */
+ return TOUCH_PRESSURE - 1;
+ } else {
+ mrstouch_report_xy(tsdev, x, y, TOUCH_PRESSURE + 1); /* Pen Touched */
+ return TOUCH_PRESSURE + 1;
+ }
+
+ return 0;
+
+ipc_error:
+ dev_err(&tsdev->spi->dev, "ipc error during fs_adc read\n");
+ return err;
+}
+
+/* To handle free scale pmic pendet interrupt */
+static int pmic0_pendet(void *dev_id)
+{
+ int err, count;
+ u16 chan;
+ unsigned int touched;
+ struct mrstouch_dev *tsdev = (struct mrstouch_dev *)dev_id;
+ u16 reg[5];
+ u8 data[5];
+
+ chan = PMICADDR0 + tsdev->asr;
+
+ /* Set X BIAS */
+ for (count = 0; count <= 3; count++) {
+ reg[count] = chan++;
+ data[count] = 0x2A;
+ }
+ reg[count] = chan++; /* Dummy */
+ data[count] = 0;
+
+ err = intel_scu_ipc_writev(reg, data, 5);
+ if (err)
+ goto ipc_error;
+
+ msleep(WAIT_ADC_COMPLETION);
+
+ /* Set Y BIAS */
+ for (count = 0; count <= 3; count++) {
+ reg[count] = chan++;
+ data[count] = 0x4A;
+ }
+ reg[count] = chan++; /* Dummy */
+ data[count] = 0;
+
+ err = intel_scu_ipc_writev(reg, data, 5);
+ if (err)
+ goto ipc_error;
+
+ msleep(WAIT_ADC_COMPLETION);
+
+ /* Set Z BIAS */
+ err = intel_scu_ipc_iowrite32(chan + 2, 0x8A8A8A8A);
+ if (err)
+ goto ipc_error;
+
+ 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);
+ }
+
+ /* 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);
+ kfree(mrstouchdevp);
+ if (mrstouchdevp->pendet_thrd)
+ kthread_stop(mrstouchdevp->pendet_thrd);
+ 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");
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-03 02:49:52 +0000