From patchwork Wed Nov 4 13:23:01 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Koskinen, Aaro (Nokia - FI/Espoo)" X-Patchwork-Id: 57578 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id nA4DOEE7007677 for ; Wed, 4 Nov 2009 13:24:15 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756183AbZKDNXf (ORCPT ); Wed, 4 Nov 2009 08:23:35 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756181AbZKDNXf (ORCPT ); Wed, 4 Nov 2009 08:23:35 -0500 Received: from smtp.nokia.com ([192.100.122.230]:40589 "EHLO mgw-mx03.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756042AbZKDNXa (ORCPT ); Wed, 4 Nov 2009 08:23:30 -0500 Received: from esebh105.NOE.Nokia.com (esebh105.ntc.nokia.com [172.21.138.211]) by mgw-mx03.nokia.com (Switch-3.3.3/Switch-3.3.3) with ESMTP id nA4DNB8S002574; Wed, 4 Nov 2009 15:23:14 +0200 Received: from esebh102.NOE.Nokia.com ([172.21.138.183]) by esebh105.NOE.Nokia.com with Microsoft SMTPSVC(6.0.3790.3959); Wed, 4 Nov 2009 15:23:11 +0200 Received: from mgw-da01.ext.nokia.com ([147.243.128.24]) by esebh102.NOE.Nokia.com over TLS secured channel with Microsoft SMTPSVC(6.0.3790.3959); Wed, 4 Nov 2009 15:23:08 +0200 Received: from localhost.localdomain (esdhcp041122.research.nokia.com [172.21.41.122]) by mgw-da01.ext.nokia.com (Switch-3.3.3/Switch-3.3.3) with ESMTP id nA4DN355004800; Wed, 4 Nov 2009 15:23:03 +0200 From: Aaro Koskinen To: linux-input@vger.kernel.org, linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, dmitry.torokhov@gmail.com, tony@atomide.com Cc: Lauri Leukkunen , Aaro Koskinen , David Brownell , Phil Carmody , Imre Deak , Hiroshi DOYU , Ari Kauppi , Jarkko Nikula , Eero Nurkkala , Roman Tereshonkov Subject: [PATCH v2 1/2] input: touchscreen: introduce tsc2005 driver Date: Wed, 4 Nov 2009 15:23:01 +0200 Message-Id: <1257340982-22814-1-git-send-email-aaro.koskinen@nokia.com> X-Mailer: git-send-email 1.6.0.4 X-OriginalArrivalTime: 04 Nov 2009 13:23:09.0856 (UTC) FILETIME=[F3DCFA00:01CA5D51] X-Nokia-AV: Clean Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index 8cc453c..b758ba8 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -501,6 +501,17 @@ config TOUCHSCREEN_TOUCHIT213 To compile this driver as a module, choose M here: the module will be called touchit213. +config TOUCHSCREEN_TSC2005 + tristate "TSC2005 based touchscreens" + depends on SPI_MASTER + help + Say Y here if you have a TSC2005 based touchscreen. + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called tsc2005. + config TOUCHSCREEN_TSC2007 tristate "TSC2007 based touchscreens" depends on I2C diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 15fa62c..0626f9f 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -29,6 +29,7 @@ obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += penmount.o obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o +obj-$(CONFIG_TOUCHSCREEN_TSC2005) += tsc2005.o obj-$(CONFIG_TOUCHSCREEN_TSC2007) += tsc2007.o obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001) += wacom_w8001.o diff --git a/drivers/input/touchscreen/tsc2005.c b/drivers/input/touchscreen/tsc2005.c new file mode 100644 index 0000000..abc0548 --- /dev/null +++ b/drivers/input/touchscreen/tsc2005.c @@ -0,0 +1,958 @@ +/* + * TSC2005 touchscreen driver + * + * Copyright (C) 2006-2009 Nokia Corporation + * + * Author: Lauri Leukkunen + * based on TSC2301 driver by Klaus K. Pedersen + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * 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; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include +#include +#include +#include +#include +#include + +#include + +/** + * The touchscreen interface operates as follows: + * + * Initialize: + * Request access to GPIO103 (DAV) + * tsc2005_ts_irq_handler will trigger when DAV line goes down + * + * 1) Pen is pressed against touchscreeen + * 2) TSC2005 performs AD conversion + * 3) After the conversion is done TSC2005 drives DAV line down + * 4) GPIO IRQ is received and tsc2005_ts_irq_handler is called + * 5) tsc2005_ts_irq_handler queues up an spi transfer to fetch + * the x, y, z1, z2 values + * 6) tsc2005_ts_rx() reports coordinates to input layer and + * sets up tsc2005_ts_timer() to be called after TSC2005_TS_SCAN_TIME + * 7) When the penup_timer expires, there have not been DAV interrupts + * during the last 20ms which means the pen has been lifted. + */ + +#define TSC2005_VDD_LOWER_27 + +#ifdef TSC2005_VDD_LOWER_27 +#define TSC2005_HZ (10000000) +#else +#define TSC2005_HZ (25000000) +#endif + +#define TSC2005_CMD (0x80) +#define TSC2005_REG (0x00) + +#define TSC2005_CMD_STOP (1) +#define TSC2005_CMD_10BIT (0 << 2) +#define TSC2005_CMD_12BIT (1 << 2) + +#define TSC2005_CMD_SCAN_XYZZ (0 << 3) +#define TSC2005_CMD_SCAN_XY (1 << 3) +#define TSC2005_CMD_SCAN_X (2 << 3) +#define TSC2005_CMD_SCAN_Y (3 << 3) +#define TSC2005_CMD_SCAN_ZZ (4 << 3) +#define TSC2005_CMD_AUX_SINGLE (5 << 3) +#define TSC2005_CMD_TEMP1 (6 << 3) +#define TSC2005_CMD_TEMP2 (7 << 3) +#define TSC2005_CMD_AUX_CONT (8 << 3) +#define TSC2005_CMD_TEST_X_CONN (9 << 3) +#define TSC2005_CMD_TEST_Y_CONN (10 << 3) +#define TSC2005_CMD_TEST_SHORT (11 << 3) +/* command 12 reserved, according to 2008-03 erratum */ +#define TSC2005_CMD_DRIVE_XX (13 << 3) +#define TSC2005_CMD_DRIVE_YY (14 << 3) +#define TSC2005_CMD_DRIVE_YX (15 << 3) + +#define TSC2005_REG_X (0 << 3) +#define TSC2005_REG_Y (1 << 3) +#define TSC2005_REG_Z1 (2 << 3) +#define TSC2005_REG_Z2 (3 << 3) +#define TSC2005_REG_AUX (4 << 3) +#define TSC2005_REG_TEMP1 (5 << 3) +#define TSC2005_REG_TEMP2 (6 << 3) +#define TSC2005_REG_STATUS (7 << 3) +#define TSC2005_REG_AUX_HIGH (8 << 3) +#define TSC2005_REG_AUX_LOW (9 << 3) +#define TSC2005_REG_TEMP_HIGH (10 << 3) +#define TSC2005_REG_TEMP_LOW (11 << 3) +#define TSC2005_REG_CFR0 (12 << 3) +#define TSC2005_REG_CFR1 (13 << 3) +#define TSC2005_REG_CFR2 (14 << 3) +#define TSC2005_REG_FUNCTION (15 << 3) + +#define TSC2005_REG_PND0 (1 << 1) +#define TSC2005_REG_READ (0x01) +#define TSC2005_REG_WRITE (0x00) + + +#define TSC2005_CFR0_LONGSAMPLING (1) +#define TSC2005_CFR0_DETECTINWAIT (1 << 1) +#define TSC2005_CFR0_SENSETIME_32US (0) +#define TSC2005_CFR0_SENSETIME_96US (1 << 2) +#define TSC2005_CFR0_SENSETIME_544US (1 << 3) +#define TSC2005_CFR0_SENSETIME_2080US (1 << 4) +#define TSC2005_CFR0_SENSETIME_2656US (0x001C) +#define TSC2005_CFR0_PRECHARGE_20US (0x0000) +#define TSC2005_CFR0_PRECHARGE_84US (0x0020) +#define TSC2005_CFR0_PRECHARGE_276US (0x0040) +#define TSC2005_CFR0_PRECHARGE_1044US (0x0080) +#define TSC2005_CFR0_PRECHARGE_1364US (0x00E0) +#define TSC2005_CFR0_STABTIME_0US (0x0000) +#define TSC2005_CFR0_STABTIME_100US (0x0100) +#define TSC2005_CFR0_STABTIME_500US (0x0200) +#define TSC2005_CFR0_STABTIME_1MS (0x0300) +#define TSC2005_CFR0_STABTIME_5MS (0x0400) +#define TSC2005_CFR0_STABTIME_100MS (0x0700) +#define TSC2005_CFR0_CLOCK_4MHZ (0x0000) +#define TSC2005_CFR0_CLOCK_2MHZ (0x0800) +#define TSC2005_CFR0_CLOCK_1MHZ (0x1000) +#define TSC2005_CFR0_RESOLUTION12 (0x2000) +#define TSC2005_CFR0_STATUS (0x4000) +#define TSC2005_CFR0_PENMODE (0x8000) + +#define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS | \ + TSC2005_CFR0_CLOCK_1MHZ | \ + TSC2005_CFR0_RESOLUTION12 | \ + TSC2005_CFR0_PRECHARGE_276US | \ + TSC2005_CFR0_PENMODE) + +/* Bits common to both read and write of config register 0 */ +#define TSC2005_CFR0_RW_MASK 0x3fff + +#define TSC2005_CFR1_BATCHDELAY_0MS (0x0000) +#define TSC2005_CFR1_BATCHDELAY_1MS (0x0001) +#define TSC2005_CFR1_BATCHDELAY_2MS (0x0002) +#define TSC2005_CFR1_BATCHDELAY_4MS (0x0003) +#define TSC2005_CFR1_BATCHDELAY_10MS (0x0004) +#define TSC2005_CFR1_BATCHDELAY_20MS (0x0005) +#define TSC2005_CFR1_BATCHDELAY_40MS (0x0006) +#define TSC2005_CFR1_BATCHDELAY_100MS (0x0007) + +#define TSC2005_CFR1_INITVALUE (TSC2005_CFR1_BATCHDELAY_4MS) + +#define TSC2005_CFR2_MAVE_TEMP (0x0001) +#define TSC2005_CFR2_MAVE_AUX (0x0002) +#define TSC2005_CFR2_MAVE_Z (0x0004) +#define TSC2005_CFR2_MAVE_Y (0x0008) +#define TSC2005_CFR2_MAVE_X (0x0010) +#define TSC2005_CFR2_AVG_1 (0x0000) +#define TSC2005_CFR2_AVG_3 (0x0400) +#define TSC2005_CFR2_AVG_7 (0x0800) +#define TSC2005_CFR2_MEDIUM_1 (0x0000) +#define TSC2005_CFR2_MEDIUM_3 (0x1000) +#define TSC2005_CFR2_MEDIUM_7 (0x2000) +#define TSC2005_CFR2_MEDIUM_15 (0x3000) + +#define TSC2005_CFR2_IRQ_MASK (0xC000) +#define TSC2005_CFR2_IRQ_DAV (0x4000) +#define TSC2005_CFR2_IRQ_PEN (0x8000) +#define TSC2005_CFR2_IRQ_PENDAV (0x0000) + +#define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_IRQ_PENDAV | \ + TSC2005_CFR2_MAVE_X | \ + TSC2005_CFR2_MAVE_Y | \ + TSC2005_CFR2_MAVE_Z | \ + TSC2005_CFR2_MEDIUM_15 | \ + TSC2005_CFR2_AVG_7) + +#define MAX_12BIT ((1 << 12) - 1) +#define TS_SAMPLES 4 +#define TSC2005_TS_PENUP_TIME 40 + +static const u32 tsc2005_read_reg[] = { + (TSC2005_REG | TSC2005_REG_X | TSC2005_REG_READ) << 16, + (TSC2005_REG | TSC2005_REG_Y | TSC2005_REG_READ) << 16, + (TSC2005_REG | TSC2005_REG_Z1 | TSC2005_REG_READ) << 16, + (TSC2005_REG | TSC2005_REG_Z2 | TSC2005_REG_READ) << 16, +}; +#define NUM_READ_REGS (sizeof(tsc2005_read_reg)/sizeof(tsc2005_read_reg[0])) + +struct tsc2005 { + struct spi_device *spi; + + struct input_dev *idev; + char phys[32]; + struct timer_list penup_timer; + + /* ESD recovery via a hardware reset if the tsc2005 + * doesn't respond after a configurable period (in ms) of + * IRQ/SPI inactivity. If esd_timeout is 0, timer and work + * fields are used. + */ + u32 esd_timeout; + struct timer_list esd_timer; + struct work_struct esd_work; + + spinlock_t lock; + struct mutex mutex; + + struct spi_message read_msg; + struct spi_transfer read_xfer[NUM_READ_REGS]; + u32 data[NUM_READ_REGS]; + + /* previously reported x,y,p (if pen_down) */ + int out_x; + int out_y; + int out_p; + /* fudge parameters - changes must exceed one of these. */ + int fudge_x; + int fudge_y; + int fudge_p; + /* raw copy of previous x,y,z */ + int in_x; + int in_y; + int in_z1; + int in_z2; + /* average accumulators for each component */ + int sample_cnt; + int avg_x; + int avg_y; + int avg_z1; + int avg_z2; + /* configuration */ + int x_plate_ohm; + int hw_avg_max; + int stab_time; + int p_max; + int touch_pressure; + /* status */ + u8 sample_sent; + u8 pen_down; + u8 disabled; + u8 disable_depth; + u8 spi_pending; + + void (*set_reset)(bool enable); +}; + +static void tsc2005_cmd(struct tsc2005 *ts, u8 cmd) +{ + u8 data = TSC2005_CMD | TSC2005_CMD_12BIT | cmd; + struct spi_message msg; + struct spi_transfer xfer = { 0 }; + + xfer.tx_buf = &data; + xfer.rx_buf = NULL; + xfer.len = 1; + xfer.bits_per_word = 8; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + spi_sync(ts->spi, &msg); +} + +static void tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value) +{ + u32 tx; + struct spi_message msg; + struct spi_transfer xfer = { 0 }; + + tx = (TSC2005_REG | reg | TSC2005_REG_PND0 | + TSC2005_REG_WRITE) << 16; + tx |= value; + + xfer.tx_buf = &tx; + xfer.rx_buf = NULL; + xfer.len = 4; + xfer.bits_per_word = 24; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + spi_sync(ts->spi, &msg); +} + +static void tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value) +{ + u32 tx; + u32 rx = 0; + struct spi_message msg; + struct spi_transfer xfer = { 0 }; + + tx = (TSC2005_REG | reg | TSC2005_REG_READ) << 16; + + xfer.tx_buf = &tx; + xfer.rx_buf = ℞ + xfer.len = 4; + xfer.bits_per_word = 24; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + spi_sync(ts->spi, &msg); + *value = rx; +} + +static void tsc2005_ts_update_pen_state(struct tsc2005 *ts, + int x, int y, int pressure) +{ + if (pressure) { + input_report_abs(ts->idev, ABS_X, x); + input_report_abs(ts->idev, ABS_Y, y); + input_report_abs(ts->idev, ABS_PRESSURE, pressure); + if (!ts->pen_down) { + input_report_key(ts->idev, BTN_TOUCH, 1); + ts->pen_down = 1; + } + } else { + input_report_abs(ts->idev, ABS_PRESSURE, 0); + if (ts->pen_down) { + input_report_key(ts->idev, BTN_TOUCH, 0); + ts->pen_down = 0; + } + } + + input_sync(ts->idev); +} + +/* + * This function is called by the SPI framework after the coordinates + * have been read from TSC2005 + */ +static void tsc2005_ts_rx(void *arg) +{ + struct tsc2005 *ts = arg; + unsigned long flags; + int inside_rect, pressure_limit; + int x, y, z1, z2, pressure; + + spin_lock_irqsave(&ts->lock, flags); + + if (ts->disable_depth) { + ts->spi_pending = 0; + goto out; + } + + x = ts->data[0]; + y = ts->data[1]; + z1 = ts->data[2]; + z2 = ts->data[3]; + + /* validate pressure and position */ + if (x > MAX_12BIT || y > MAX_12BIT) + goto out; + + /* skip coords if the pressure-components are out of range */ + if (z1 < 100 || z2 > MAX_12BIT || z1 >= z2) + goto out; + + /* skip point if this is a pen down with the exact same values as + * the value before pen-up - that implies SPI fed us stale data + */ + if (!ts->pen_down && + ts->in_x == x && + ts->in_y == y && + ts->in_z1 == z1 && + ts->in_z2 == z2) + goto out; + + /* At this point we are happy we have a valid and useful reading. + * Remember it for later comparisons. We may now begin downsampling + */ + ts->in_x = x; + ts->in_y = y; + ts->in_z1 = z1; + ts->in_z2 = z2; + + /* don't run average on the "pen down" event */ + if (ts->sample_sent) { + ts->avg_x += x; + ts->avg_y += y; + ts->avg_z1 += z1; + ts->avg_z2 += z2; + + if (++ts->sample_cnt < TS_SAMPLES) + goto out; + + x = ts->avg_x / TS_SAMPLES; + y = ts->avg_y / TS_SAMPLES; + z1 = ts->avg_z1 / TS_SAMPLES; + z2 = ts->avg_z2 / TS_SAMPLES; + } + + ts->sample_cnt = 0; + ts->avg_x = 0; + ts->avg_y = 0; + ts->avg_z1 = 0; + ts->avg_z2 = 0; + + pressure = x * (z2 - z1) / z1; + pressure = pressure * ts->x_plate_ohm / 4096; + + pressure_limit = ts->sample_sent ? ts->p_max : ts->touch_pressure; + if (pressure > pressure_limit) + goto out; + + /* Discard the event if it still is within the previous rect - + * unless the pressure is clearly harder, but then use previous + * x,y position. If any coordinate deviates enough, fudging + * of all three will still take place in the input layer. + */ + inside_rect = (ts->sample_sent && + x > (int)ts->out_x - ts->fudge_x && + x < (int)ts->out_x + ts->fudge_x && + y > (int)ts->out_y - ts->fudge_y && + y < (int)ts->out_y + ts->fudge_y); + if (inside_rect) + x = ts->out_x, y = ts->out_y; + + if (!inside_rect || pressure < (ts->out_p - ts->fudge_p)) { + tsc2005_ts_update_pen_state(ts, x, y, pressure); + ts->sample_sent = 1; + ts->out_x = x; + ts->out_y = y; + ts->out_p = pressure; + } +out: + if (ts->spi_pending > 1) { + /* One or more interrupts (sometimes several dozens) + * occured while waiting for the SPI read - get + * another read going. + */ + ts->spi_pending = 1; + if (spi_async(ts->spi, &ts->read_msg)) { + dev_err(&ts->spi->dev, "ts: spi_async() failed"); + ts->spi_pending = 0; + } + } else + ts->spi_pending = 0; + + /* kick pen up timer - to make sure it expires again(!) */ + if (ts->sample_sent) { + mod_timer(&ts->penup_timer, + jiffies + msecs_to_jiffies(TSC2005_TS_PENUP_TIME)); + /* Also kick the watchdog, as we still think we're alive */ + if (ts->esd_timeout && ts->disable_depth == 0) { + unsigned long wdj = msecs_to_jiffies(ts->esd_timeout); + mod_timer(&ts->esd_timer, round_jiffies(jiffies+wdj)); + } + } + spin_unlock_irqrestore(&ts->lock, flags); +} + +/* This penup timer is very forgiving of delayed SPI reads. The + * (ESD) watchdog will rescue us if spi_pending remains set, unless + * we are enterring the disabled state. In that case we must just + * handle the pen up, and let disabling complete. + */ +static void tsc2005_ts_penup_timer_handler(unsigned long data) +{ + struct tsc2005 *ts = (struct tsc2005 *)data; + if ((!ts->spi_pending || ts->disable_depth) && + ts->sample_sent) { + tsc2005_ts_update_pen_state(ts, 0, 0, 0); + ts->sample_sent = 0; + } +} + +/* + * This interrupt is called when pen is down and coordinates are + * available. That is indicated by a either: + * a) a rising edge on PINTDAV or (PENDAV mode) + * b) a falling edge on DAV line (DAV mode) + * depending on the setting of the IRQ bits in the CFR2 setting above. + */ +static irqreturn_t tsc2005_ts_irq_handler(int irq, void *dev_id) +{ + struct tsc2005 *ts = dev_id; + if (ts->disable_depth) + goto out; + + if (!ts->spi_pending) { + if (spi_async(ts->spi, &ts->read_msg)) { + dev_err(&ts->spi->dev, "ts: spi_async() failed"); + goto out; + } + } + /* By shifting in 1s we can never wrap */ + ts->spi_pending = (ts->spi_pending<<1)+1; + + /* Kick pen up timer only if it's not been started yet. Strictly, + * it isn't even necessary to start it at all here, but doing so + * keeps an equivalence between pen state and timer state. + * The SPI read loop will keep pushing it into the future. + * If it times out with an SPI pending, it's ignored anyway. + */ + if (!timer_pending(&ts->penup_timer)) { + unsigned long pu = msecs_to_jiffies(TSC2005_TS_PENUP_TIME); + ts->penup_timer.expires = jiffies + pu; + add_timer(&ts->penup_timer); + } +out: + return IRQ_HANDLED; +} + +static void tsc2005_ts_setup_spi_xfer(struct tsc2005 *ts) +{ + struct spi_message *m = &ts->read_msg; + struct spi_transfer *x = &ts->read_xfer[0]; + int i; + + spi_message_init(m); + + for (i = 0; i < NUM_READ_REGS; i++, x++) { + x->tx_buf = &tsc2005_read_reg[i]; + x->rx_buf = &ts->data[i]; + x->len = 4; + x->bits_per_word = 24; + x->cs_change = i < (NUM_READ_REGS - 1); + spi_message_add_tail(x, m); + } + + m->complete = tsc2005_ts_rx; + m->context = ts; +} + +static ssize_t tsc2005_ts_pen_down_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct tsc2005 *ts = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", ts->pen_down); +} + +static DEVICE_ATTR(pen_down, S_IRUGO, tsc2005_ts_pen_down_show, NULL); + +static int tsc2005_configure(struct tsc2005 *ts, int flags) +{ + tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE); + tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE); + tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE); + tsc2005_cmd(ts, flags); + + return 0; +} + +static void tsc2005_start_scan(struct tsc2005 *ts) +{ + tsc2005_configure(ts, TSC2005_CMD_SCAN_XYZZ); +} + +static void tsc2005_stop_scan(struct tsc2005 *ts) +{ + tsc2005_cmd(ts, TSC2005_CMD_STOP); +} + +/* Must be called with mutex held */ +static void tsc2005_disable(struct tsc2005 *ts) +{ + if (ts->disable_depth++ != 0) + return; + + disable_irq(ts->spi->irq); + if (ts->esd_timeout) + del_timer(&ts->esd_timer); + + /* wait until penup timer expire normally */ + do { + msleep(4); + } while (ts->sample_sent); + + tsc2005_stop_scan(ts); +} + +static void tsc2005_enable(struct tsc2005 *ts) +{ + if (ts->disable_depth != 1) + goto out; + + if (ts->esd_timeout) { + unsigned long wdj = msecs_to_jiffies(ts->esd_timeout); + ts->esd_timer.expires = round_jiffies(jiffies+wdj); + add_timer(&ts->esd_timer); + } + tsc2005_start_scan(ts); + enable_irq(ts->spi->irq); +out: + --ts->disable_depth; +} + +static ssize_t tsc2005_disable_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct tsc2005 *ts = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", ts->disabled); +} + +static ssize_t tsc2005_disable_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct tsc2005 *ts = dev_get_drvdata(dev); + unsigned long res; + int i; + + if (strict_strtoul(buf, 10, &res) < 0) + return -EINVAL; + i = res ? 1 : 0; + + mutex_lock(&ts->mutex); + if (i == ts->disabled) + goto out; + ts->disabled = i; + + if (i) + tsc2005_disable(ts); + else + tsc2005_enable(ts); +out: + mutex_unlock(&ts->mutex); + return count; +} + +static DEVICE_ATTR(disable_ts, 0664, tsc2005_disable_show, + tsc2005_disable_store); + +static ssize_t tsc2005_ctrl_selftest_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + u16 temp_high_orig, temp_high_test, temp_high; + unsigned int result = 1; + struct tsc2005 *ts = dev_get_drvdata(dev); + + if (!ts->set_reset) { + dev_warn(&ts->spi->dev, + "unable to selftest: reset not configured\n"); + result = 0; + goto out; + } + + mutex_lock(&ts->mutex); + tsc2005_disable(ts); + + /* Test ctrl communications via temp high / low registers */ + tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig); + + temp_high_test = (temp_high_orig - 1) & 0x0FFF; + + tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test); + + tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); + + if (temp_high != temp_high_test) { + result = 0; + dev_warn(dev, "selftest failed: %d != %d\n", + temp_high, temp_high_test); + } + + /* HW Reset */ + ts->set_reset(0); + msleep(1); /* only 10us required */ + ts->set_reset(1); + + tsc2005_enable(ts); + + /* Test that reset really happened */ + tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); + + if (temp_high != temp_high_orig) { + result = 0; + dev_warn(dev, "selftest failed after reset: " + "%d != %d\n", + temp_high, temp_high_orig); + } + + mutex_unlock(&ts->mutex); + +out: + return sprintf(buf, "%u\n", result); +} + +static DEVICE_ATTR(ts_ctrl_selftest, S_IRUGO, tsc2005_ctrl_selftest_show, NULL); + +static void tsc2005_esd_timer_handler(unsigned long data) +{ + struct tsc2005 *ts = (struct tsc2005 *)data; + if (!ts->disable_depth) + schedule_work(&ts->esd_work); +} + +static void tsc2005_rst_handler(struct work_struct *work) +{ + u16 reg_val; + struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work); + unsigned long wdj; + + mutex_lock(&ts->mutex); + + /* If we are disabled, or the a touch has been detected, + * then ignore this timeout. The enable will restart the + * watchdog, as it restarts scanning + */ + if (ts->disable_depth) + goto out; + + /* If we cannot read our known value from configuration register 0 + * then reset the controller as if from power-up and start + * scanning again. Always re-arm the watchdog. + */ + tsc2005_read(ts, TSC2005_REG_CFR0, ®_val); + if ((reg_val ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK) { + dev_info(&ts->spi->dev, "TSC not responding, resetting.\n"); + /* If this timer kicked in, the penup timer, if ever active + * at all, must have expired ages ago, so no need to del it. + */ + ts->set_reset(0); + if (ts->sample_sent) { + tsc2005_ts_update_pen_state(ts, 0, 0, 0); + ts->sample_sent = 0; + } + ts->spi_pending = 0; + msleep(1); /* only 10us required */ + ts->set_reset(1); + tsc2005_start_scan(ts); + } + wdj = msecs_to_jiffies(ts->esd_timeout); + mod_timer(&ts->esd_timer, round_jiffies(jiffies+wdj)); + +out: + mutex_unlock(&ts->mutex); +} + +static int __devinit tsc2005_ts_init(struct tsc2005 *ts, + struct tsc2005_platform_data *pdata) +{ + struct input_dev *idev; + int r; + int x_max, y_max; + + init_timer(&ts->penup_timer); + setup_timer(&ts->penup_timer, tsc2005_ts_penup_timer_handler, + (unsigned long)ts); + + spin_lock_init(&ts->lock); + mutex_init(&ts->mutex); + + ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280; + ts->hw_avg_max = pdata->ts_hw_avg; + ts->stab_time = pdata->ts_stab_time; + x_max = pdata->ts_x_max ? : 4096; + ts->fudge_x = pdata->ts_x_fudge ? : 4; + y_max = pdata->ts_y_max ? : 4096; + ts->fudge_y = pdata->ts_y_fudge ? : 8; + ts->p_max = pdata->ts_pressure_max ? : MAX_12BIT; + ts->touch_pressure = pdata->ts_touch_pressure ? : ts->p_max; + ts->fudge_p = pdata->ts_pressure_fudge ? : 2; + + ts->set_reset = pdata->set_reset; + + idev = input_allocate_device(); + if (idev == NULL) { + r = -ENOMEM; + goto err1; + } + + idev->name = "TSC2005 touchscreen"; + snprintf(ts->phys, sizeof(ts->phys), "%s/input-ts", + dev_name(&ts->spi->dev)); + idev->phys = ts->phys; + + idev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); + idev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE); + idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); + ts->idev = idev; + + tsc2005_ts_setup_spi_xfer(ts); + + input_set_abs_params(idev, ABS_X, 0, x_max, ts->fudge_x, 0); + input_set_abs_params(idev, ABS_Y, 0, y_max, ts->fudge_y, 0); + input_set_abs_params(idev, ABS_PRESSURE, 0, ts->p_max, ts->fudge_p, 0); + + tsc2005_start_scan(ts); + + r = request_irq(ts->spi->irq, tsc2005_ts_irq_handler, + (((TSC2005_CFR2_INITVALUE & TSC2005_CFR2_IRQ_MASK) == + TSC2005_CFR2_IRQ_PENDAV) + ? IRQF_TRIGGER_RISING + : IRQF_TRIGGER_FALLING) | + IRQF_DISABLED, "tsc2005", ts); + if (r < 0) { + dev_err(&ts->spi->dev, "unable to get DAV IRQ"); + goto err2; + } + + set_irq_wake(ts->spi->irq, 1); + + r = input_register_device(idev); + if (r < 0) { + dev_err(&ts->spi->dev, "can't register touchscreen device\n"); + goto err3; + } + + /* We can tolerate these failing */ + r = device_create_file(&ts->spi->dev, &dev_attr_ts_ctrl_selftest); + if (r < 0) + dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n", + dev_attr_ts_ctrl_selftest.attr.name, r); + + r = device_create_file(&ts->spi->dev, &dev_attr_pen_down); + if (r < 0) + dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n", + dev_attr_pen_down.attr.name, r); + + r = device_create_file(&ts->spi->dev, &dev_attr_disable_ts); + if (r < 0) + dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n", + dev_attr_disable_ts.attr.name, r); + + /* Finally, configure and start the optional EDD watchdog. */ + ts->esd_timeout = pdata->esd_timeout; + if (ts->esd_timeout && ts->set_reset) { + unsigned long wdj; + setup_timer(&ts->esd_timer, tsc2005_esd_timer_handler, + (unsigned long)ts); + INIT_WORK(&ts->esd_work, tsc2005_rst_handler); + wdj = msecs_to_jiffies(ts->esd_timeout); + ts->esd_timer.expires = round_jiffies(jiffies+wdj); + add_timer(&ts->esd_timer); + } + + return 0; +err3: + free_irq(ts->spi->irq, ts); +err2: + tsc2005_stop_scan(ts); + input_free_device(idev); +err1: + return r; +} + +static int __devinit tsc2005_probe(struct spi_device *spi) +{ + struct tsc2005 *ts; + struct tsc2005_platform_data *pdata = spi->dev.platform_data; + int r; + + if (spi->irq < 0) { + dev_dbg(&spi->dev, "no irq?\n"); + return -ENODEV; + } + if (!pdata) { + dev_dbg(&spi->dev, "no platform data?\n"); + return -ENODEV; + } + + ts = kzalloc(sizeof(*ts), GFP_KERNEL); + if (ts == NULL) + return -ENOMEM; + + dev_set_drvdata(&spi->dev, ts); + ts->spi = spi; + spi->dev.power.power_state = PMSG_ON; + + spi->mode = SPI_MODE_0; + spi->bits_per_word = 8; + /* The max speed might've been defined by the board-specific + * struct */ + if (!spi->max_speed_hz) + spi->max_speed_hz = TSC2005_HZ; + + spi_setup(spi); + + r = tsc2005_ts_init(ts, pdata); + if (r) + goto err1; + + return 0; + +err1: + kfree(ts); + return r; +} + +static int __devexit tsc2005_remove(struct spi_device *spi) +{ + struct tsc2005 *ts = dev_get_drvdata(&spi->dev); + + mutex_lock(&ts->mutex); + tsc2005_disable(ts); + mutex_unlock(&ts->mutex); + + device_remove_file(&ts->spi->dev, &dev_attr_disable_ts); + device_remove_file(&ts->spi->dev, &dev_attr_pen_down); + device_remove_file(&ts->spi->dev, &dev_attr_ts_ctrl_selftest); + + free_irq(ts->spi->irq, ts); + input_unregister_device(ts->idev); + + if (ts->esd_timeout) + del_timer(&ts->esd_timer); + kfree(ts); + + return 0; +} + +#ifdef CONFIG_PM +static int tsc2005_suspend(struct spi_device *spi, pm_message_t mesg) +{ + struct tsc2005 *ts = dev_get_drvdata(&spi->dev); + + mutex_lock(&ts->mutex); + tsc2005_disable(ts); + mutex_unlock(&ts->mutex); + + return 0; +} + +static int tsc2005_resume(struct spi_device *spi) +{ + struct tsc2005 *ts = dev_get_drvdata(&spi->dev); + + mutex_lock(&ts->mutex); + tsc2005_enable(ts); + mutex_unlock(&ts->mutex); + + return 0; +} +#endif + +static struct spi_driver tsc2005_driver = { + .driver = { + .name = "tsc2005", + .owner = THIS_MODULE, + }, +#ifdef CONFIG_PM + .suspend = tsc2005_suspend, + .resume = tsc2005_resume, +#endif + .probe = tsc2005_probe, + .remove = __devexit_p(tsc2005_remove), +}; + +static int __init tsc2005_init(void) +{ + printk(KERN_INFO "TSC2005 driver initializing\n"); + + return spi_register_driver(&tsc2005_driver); +} +module_init(tsc2005_init); + +static void __exit tsc2005_exit(void) +{ + spi_unregister_driver(&tsc2005_driver); +} +module_exit(tsc2005_exit); + +MODULE_AUTHOR("Lauri Leukkunen "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:tsc2005"); diff --git a/include/linux/spi/tsc2005.h b/include/linux/spi/tsc2005.h new file mode 100644 index 0000000..1a60c90 --- /dev/null +++ b/include/linux/spi/tsc2005.h @@ -0,0 +1,30 @@ +#ifndef _LINUX_SPI_TSC2005_H +#define _LINUX_SPI_TSC2005_H + +#include + +struct tsc2005_platform_data { + u16 ts_x_plate_ohm; + u32 ts_stab_time; /* voltage settling time */ + u8 ts_hw_avg; /* HW assiseted averaging. Can be + 0, 4, 8, 16 samples per reading */ + u32 ts_touch_pressure; /* Pressure limit until we report a + touch event. After that we switch + to ts_max_pressure. */ + u32 ts_pressure_max;/* Samples with bigger pressure value will + be ignored, since the corresponding X, Y + values are unreliable */ + u32 ts_pressure_fudge; + u32 ts_x_max; + u32 ts_x_fudge; + u32 ts_y_max; + u32 ts_y_fudge; + + u32 esd_timeout; /* msec of inactivity before we check */ + + unsigned ts_ignore_last:1; + + void (*set_reset)(bool enable); +}; + +#endif