From patchwork Tue Jun 1 11:50:06 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alan Cox X-Patchwork-Id: 103531 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.3/8.14.3) with ESMTP id o51CaK6H009327 for ; Tue, 1 Jun 2010 12:36:20 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756148Ab0FAMgT (ORCPT ); Tue, 1 Jun 2010 08:36:19 -0400 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:37975 "EHLO bob.linux.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755952Ab0FAMgS (ORCPT ); Tue, 1 Jun 2010 08:36:18 -0400 Received: from localhost.localdomain (localhost [127.0.0.1]) by bob.linux.org.uk (8.14.3/8.14.3) with ESMTP id o51Bo6rk022373; Tue, 1 Jun 2010 12:50:07 +0100 From: Alan Cox Subject: [PATCH] mid: Intel MID touch screen driver To: greg@kroah.com, linux-input@vger.kernel.org Date: Tue, 01 Jun 2010 12:50:06 +0100 Message-ID: <20100601114931.22298.8850.stgit@localhost.localdomain> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Tue, 01 Jun 2010 12:36:20 +0000 (UTC) diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig index b5c3b30..4828515 100644 --- a/drivers/staging/Kconfig +++ b/drivers/staging/Kconfig @@ -141,5 +141,7 @@ source "drivers/staging/ti-st/Kconfig" source "drivers/staging/adis16255/Kconfig" +source "drivers/staging/mrst-touchscreen/Kconfig" + endif # !STAGING_EXCLUDE_BUILD endif # STAGING diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile index e330dd5..9e19849 100644 --- a/drivers/staging/Makefile +++ b/drivers/staging/Makefile @@ -51,3 +51,4 @@ obj-$(CONFIG_CRYSTALHD) += crystalhd/ obj-$(CONFIG_CXT1E1) += cxt1e1/ obj-$(CONFIG_TI_ST) += ti-st/ obj-$(CONFIG_ADIS16255) += adis16255/ +obj-$(CONFIG_TOUCHSCREEN_MRSTOUCH) += mrst-touchscreen/ diff --git a/drivers/staging/mrst-touchscreen/Kconfig b/drivers/staging/mrst-touchscreen/Kconfig new file mode 100644 index 0000000..c2af492 --- /dev/null +++ b/drivers/staging/mrst-touchscreen/Kconfig @@ -0,0 +1,7 @@ +config TOUCHSCREEN_INTEL_MID + tristate "Intel MID platform resistive touchscreen" + depends on INTEL_SCU_IPC + default y + help + Say Y here if you have a Intel MID based touchscreen + If unsure, say N. diff --git a/drivers/staging/mrst-touchscreen/Makefile b/drivers/staging/mrst-touchscreen/Makefile new file mode 100644 index 0000000..2d638b0 --- /dev/null +++ b/drivers/staging/mrst-touchscreen/Makefile @@ -0,0 +1,3 @@ +obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) := intel_mid_touch.o + + diff --git a/drivers/staging/mrst-touchscreen/TODO b/drivers/staging/mrst-touchscreen/TODO new file mode 100644 index 0000000..7157028 --- /dev/null +++ b/drivers/staging/mrst-touchscreen/TODO @@ -0,0 +1,2 @@ +- Move the driver to not think it is SPI (requires fixing some of the SFI + and firmware side) 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 0000000..3c15ee5 --- /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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +#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, ®); + 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");