* [PATCH v8 1/3] Input: cyttsp - Cypress TTSP capacitive multi-touch screen support
2012-01-05 0:16 [PATCH v8 0/3] Input: Cypress TTSP device driver Javier Martinez Canillas
@ 2012-01-05 0:16 ` Javier Martinez Canillas
2012-01-09 17:35 ` Henrik Rydberg
2012-01-05 0:16 ` [PATCH v8 2/3] Input: cyttsp - add support for Cypress TTSP touchscreen I2C bus interface Javier Martinez Canillas
2012-01-05 0:16 ` [PATCH v8 3/3] Input: cyttsp - add support for Cypress TTSP touchscreen SPI " Javier Martinez Canillas
2 siblings, 1 reply; 6+ messages in thread
From: Javier Martinez Canillas @ 2012-01-05 0:16 UTC (permalink / raw)
To: Dmitry Torokhov
Cc: Henrik Rydberg, Mohan Pallaka, Kevin McNeely, Shubhrajyoti Datta,
linux-input, linux-kernel, Javier Martinez Canillas
Cypress TrueTouch(tm) Standard Product controllers are found in
a wide range of embedded devices. This driver add support for a
variety of TTSP controllers.
Since the hardware is capable of tracking identifiable contacts, multi-touch
protocol type B (stateful) is used to report contact information.
The driver is composed of a core driver that process the data sent by
the contacts and a set of bus specific interface modules. This patch
adds the base core TTSP driver.
Signed-off-by: Javier Martinez Canillas <javier@dowhile0.org>
---
Changes for v8:
Dmitry Torokhov (9):
- Fix use-after-free in cyttsp_release
- Remove ext() method from bus ops
- Move up into main touchscreen directory
- Rework Kconfig entries
- Guard PM methods with CONFIG_PM_SLEEP
- Device does not belong in bus structure
- Set up bus type in input device
- Use unified structure for ts object
- Consolidate PM methods
Javier Martinez Canillas (5):
- Add <linux/device.h> macro to cyttsp_core.h
- Soft reset returns negative on error, not 0
- Use CY_NUM_RETRY instead of CY_DELAY_MAX for retries
- Add suspended an on boolean to cyttsp core
- Rework PM functions
drivers/input/touchscreen/Kconfig | 31 ++
drivers/input/touchscreen/Makefile | 3 +
drivers/input/touchscreen/cyttsp_core.c | 721 +++++++++++++++++++++++++++++++
drivers/input/touchscreen/cyttsp_core.h | 141 ++++++
include/linux/input/cyttsp.h | 69 +++
5 files changed, 965 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/touchscreen/cyttsp_core.c
create mode 100644 drivers/input/touchscreen/cyttsp_core.h
create mode 100644 include/linux/input/cyttsp.h
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 3488ffe..d2feb4e 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -136,6 +136,37 @@ config TOUCHSCREEN_CY8CTMG110
To compile this driver as a module, choose M here: the
module will be called cy8ctmg110_ts.
+config TOUCHSCREEN_CYTTSP_CORE
+ tristate "Cypress TTSP touchscreen"
+ help
+ Say Y here if you have a touchscreen using controller from
+ the Cypress TrueTouch(tm) Standard Product family connected
+ to your system. You will also need to select appropriate
+ bus connection below.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called cyttsp_core.
+
+config TOUCHSCREEN_CYTTSP_I2C
+ tristate "support I2C bus connection"
+ depends on TOUCHSCREEN_CYTTSP_CORE && I2C
+ help
+ Say Y here if the touchscreen is connected via I2C bus.
+
+ To compile this driver as a module, choose M here: the
+ module will be called cyttsp_i2c.
+
+config TOUCHSCREEN_CYTTSP_SPI
+ tristate "support SPI bus connection"
+ depends on TOUCHSCREEN_CYTTSP_CORE && SPI_MASTER
+ help
+ Say Y here if the touchscreen is connected via SPI bus.
+
+ To compile this driver as a module, choose M here: the
+ module will be called cyttsp_spi.
+
config TOUCHSCREEN_DA9034
tristate "Touchscreen support for Dialog Semiconductor DA9034"
depends on PMIC_DA903X
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index f957676..9458172 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -17,6 +17,9 @@ obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC) += atmel_tsadcc.o
obj-$(CONFIG_TOUCHSCREEN_BITSY) += h3600_ts_input.o
obj-$(CONFIG_TOUCHSCREEN_BU21013) += bu21013_ts.o
obj-$(CONFIG_TOUCHSCREEN_CY8CTMG110) += cy8ctmg110_ts.o
+obj-$(CONFIG_TOUCHSCREEN_CYTTSP_CORE) += cyttsp_core.o
+obj-$(CONFIG_TOUCHSCREEN_CYTTSP_I2C) += cyttsp_i2c.o
+obj-$(CONFIG_TOUCHSCREEN_CYTTSP_SPI) += cyttsp_spi.o
obj-$(CONFIG_TOUCHSCREEN_DA9034) += da9034-ts.o
obj-$(CONFIG_TOUCHSCREEN_DYNAPRO) += dynapro.o
obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE) += hampshire.o
diff --git a/drivers/input/touchscreen/cyttsp_core.c b/drivers/input/touchscreen/cyttsp_core.c
new file mode 100644
index 0000000..896371c
--- /dev/null
+++ b/drivers/input/touchscreen/cyttsp_core.c
@@ -0,0 +1,721 @@
+/*
+ * Core Source for:
+ * Cypress TrueTouch(TM) Standard Product (TTSP) touchscreen drivers.
+ * For use with Cypress Txx3xx parts.
+ * Supported parts include:
+ * CY8CTST341
+ * CY8CTMA340
+ *
+ * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
+ * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, and only version 2, as published by the
+ * Free Software Foundation.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com>
+ *
+ */
+
+#include "cyttsp_core.h"
+
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+
+/* Bootloader number of command keys */
+#define CY_NUM_BL_KEYS 8
+
+/* helpers */
+#define GET_NUM_TOUCHES(x) ((x) & 0x0F)
+#define IS_LARGE_AREA(x) (((x) & 0x10) >> 4)
+#define IS_BAD_PKT(x) ((x) & 0x20)
+#define IS_VALID_APP(x) ((x) & 0x01)
+#define IS_OPERATIONAL_ERR(x) ((x) & 0x3F)
+#define GET_HSTMODE(reg) ((reg & 0x70) >> 4)
+#define GET_BOOTLOADERMODE(reg) ((reg & 0x10) >> 4)
+
+#define CY_REG_BASE 0x00
+#define CY_REG_ACT_DIST 0x1E
+#define CY_REG_ACT_INTRVL 0x1D
+#define CY_REG_TCH_TMOUT (CY_REG_ACT_INTRVL+1)
+#define CY_REG_LP_INTRVL (CY_REG_TCH_TMOUT+1)
+#define CY_MAXZ 255
+#define CY_DELAY_DFLT 20 /* ms */
+#define CY_DELAY_MAX 500
+#define CY_ACT_DIST_DFLT 0xF8
+#define CY_HNDSHK_BIT 0x80
+/* device mode bits */
+#define CY_OPERATE_MODE 0x00
+#define CY_SYSINFO_MODE 0x10
+/* power mode select bits */
+#define CY_SOFT_RESET_MODE 0x01 /* return to Bootloader mode */
+#define CY_DEEP_SLEEP_MODE 0x02
+#define CY_LOW_POWER_MODE 0x04
+
+/* Slots management */
+#define CY_MAX_FINGER 4
+#define CY_MAX_ID 16
+
+static const u8 bl_command[] = {
+ 0x00, /* file offset */
+ 0xFF, /* command */
+ 0xA5, /* exit bootloader command */
+ 0, 1, 2, 3, 4, 5, 6, 7 /* default keys */
+};
+
+static int ttsp_read_block_data(struct cyttsp *ts, u8 command,
+ u8 length, void *buf)
+{
+ int retval = -1;
+ int tries;
+
+ if (!buf || !length)
+ return -EINVAL;
+
+ for (tries = 0; tries < CY_NUM_RETRY && (retval < 0); tries++) {
+ retval = ts->bus_ops->read(ts->dev, command, length, buf);
+ if (retval)
+ msleep(CY_DELAY_DFLT);
+ }
+
+ return retval;
+}
+
+static int ttsp_write_block_data(struct cyttsp *ts, u8 command,
+ u8 length, void *buf)
+{
+ int retval = -1;
+ int tries;
+
+ if (!buf || !length)
+ return -EINVAL;
+
+ for (tries = 0; tries < CY_NUM_RETRY && (retval < 0); tries++) {
+ retval = ts->bus_ops->write(ts->dev, command, length, buf);
+ if (retval)
+ msleep(CY_DELAY_DFLT);
+ }
+
+ return retval;
+}
+
+static int cyttsp_load_bl_regs(struct cyttsp *ts)
+{
+ memset(&(ts->bl_data), 0, sizeof(struct cyttsp_bootloader_data));
+
+ ts->bl_data.bl_status = 0x10;
+
+ return ttsp_read_block_data(ts, CY_REG_BASE, sizeof(ts->bl_data),
+ &ts->bl_data);
+}
+
+static int cyttsp_bl_app_valid(struct cyttsp *ts)
+{
+ int retval;
+
+ retval = cyttsp_load_bl_regs(ts);
+
+ if (retval < 0) {
+ retval = -ENODEV;
+ goto done;
+ }
+
+ if (GET_BOOTLOADERMODE(ts->bl_data.bl_status)) {
+ if (IS_VALID_APP(ts->bl_data.bl_status))
+ return 0;
+ else
+ return -ENODEV;
+ }
+
+ if (GET_HSTMODE(ts->bl_data.bl_file) == CY_OPERATE_MODE) {
+ if (!(IS_OPERATIONAL_ERR(ts->bl_data.bl_status)))
+ return 1;
+ else
+ return -ENODEV;
+ }
+
+ retval = -ENODEV;
+done:
+ return retval;
+}
+
+static int cyttsp_exit_bl_mode(struct cyttsp *ts)
+{
+ int retval;
+ int tries;
+ u8 bl_cmd[sizeof(bl_command)];
+
+ memcpy(bl_cmd, bl_command, sizeof(bl_command));
+ if (ts->pdata->bl_keys)
+ memcpy(&bl_cmd[sizeof(bl_command) - CY_NUM_BL_KEYS],
+ ts->pdata->bl_keys, sizeof(bl_command));
+
+ retval = ttsp_write_block_data(ts, CY_REG_BASE,
+ sizeof(bl_cmd), (void *)bl_cmd);
+
+ if (retval < 0)
+ return retval;
+
+ /* wait for TTSP Device to complete switch to Operational mode */
+ tries = 0;
+ do {
+ msleep(CY_DELAY_DFLT);
+ retval = cyttsp_load_bl_regs(ts);
+ } while ((retval || GET_BOOTLOADERMODE(ts->bl_data.bl_status)) &&
+ (tries++ < CY_NUM_RETRY));
+
+ if (tries >= CY_NUM_RETRY)
+ return -ENODEV;
+
+ return retval;
+}
+
+static int cyttsp_set_operational_mode(struct cyttsp *ts)
+{
+ struct cyttsp_xydata xy_data;
+ int retval;
+ int tries = 0;
+ u8 cmd = CY_OPERATE_MODE;
+
+ retval = ttsp_write_block_data(ts, CY_REG_BASE, sizeof(cmd), &cmd);
+
+ if (retval < 0)
+ return retval;
+
+ /* wait for TTSP Device to complete switch to Operational mode */
+ do {
+ retval = ttsp_read_block_data(ts, CY_REG_BASE,
+ sizeof(xy_data), &(xy_data));
+ } while ((retval || xy_data.act_dist == CY_ACT_DIST_DFLT) &&
+ (tries++ < CY_NUM_RETRY));
+
+ if (tries >= CY_NUM_RETRY)
+ return -EAGAIN;
+
+ return retval;
+}
+
+static int cyttsp_set_sysinfo_mode(struct cyttsp *ts)
+{
+ int retval;
+ int tries;
+ u8 cmd = CY_SYSINFO_MODE;
+
+ memset(&(ts->sysinfo_data), 0, sizeof(struct cyttsp_sysinfo_data));
+
+ /* switch to sysinfo mode */
+ retval = ttsp_write_block_data(ts, CY_REG_BASE, sizeof(cmd), &cmd);
+ if (retval < 0)
+ return retval;
+
+ /* read sysinfo registers */
+ tries = 0;
+ do {
+ msleep(CY_DELAY_DFLT);
+ retval = ttsp_read_block_data(ts, CY_REG_BASE,
+ sizeof(ts->sysinfo_data), &ts->sysinfo_data);
+ } while ((retval || (!ts->sysinfo_data.tts_verh &&
+ !ts->sysinfo_data.tts_verl)) &&
+ (tries++ < CY_NUM_RETRY));
+
+ if (tries >= CY_NUM_RETRY)
+ return -EAGAIN;
+
+ return retval;
+}
+
+static int cyttsp_set_sysinfo_regs(struct cyttsp *ts)
+{
+ int retval = 0;
+
+ if (ts->pdata->act_intrvl != CY_ACT_INTRVL_DFLT ||
+ ts->pdata->tch_tmout != CY_TCH_TMOUT_DFLT ||
+ ts->pdata->lp_intrvl != CY_LP_INTRVL_DFLT) {
+
+ u8 intrvl_ray[3];
+
+ intrvl_ray[0] = ts->pdata->act_intrvl;
+ intrvl_ray[1] = ts->pdata->tch_tmout;
+ intrvl_ray[2] = ts->pdata->lp_intrvl;
+
+ /* set intrvl registers */
+ retval = ttsp_write_block_data(ts,
+ CY_REG_ACT_INTRVL,
+ sizeof(intrvl_ray), intrvl_ray);
+
+ msleep(CY_DELAY_DFLT);
+ }
+
+ return retval;
+}
+
+static int cyttsp_soft_reset(struct cyttsp *ts)
+{
+ int retval;
+ u8 cmd = CY_SOFT_RESET_MODE;
+ long wait_jiffies = msecs_to_jiffies(CY_DELAY_DFLT * CY_DELAY_MAX);
+ /* wait for interrupt to set ready completion */
+ INIT_COMPLETION(ts->bl_ready);
+
+ retval = ttsp_write_block_data(ts, CY_REG_BASE, sizeof(cmd), &cmd);
+ if (retval < 0)
+ return retval;
+
+ return wait_for_completion_timeout(&ts->bl_ready, wait_jiffies);
+}
+
+static int cyttsp_act_dist_setup(struct cyttsp *ts)
+{
+ int retval;
+ u8 act_dist_setup;
+
+ /* Init gesture; active distance setup */
+ act_dist_setup = ts->pdata->act_dist;
+ retval = ttsp_write_block_data(ts, CY_REG_ACT_DIST,
+ sizeof(act_dist_setup), &act_dist_setup);
+
+ return retval;
+}
+
+static int cyttsp_hndshk(struct cyttsp *ts, u8 hst_mode)
+{
+ u8 cmd;
+
+ cmd = hst_mode ^ CY_HNDSHK_BIT;
+
+ return ttsp_write_block_data(ts, CY_REG_BASE, sizeof(cmd), (u8 *)&cmd);
+}
+
+static void cyttsp_report_slot(struct input_dev *dev, int slot,
+ int x, int y, int z)
+{
+ input_mt_slot(dev, slot);
+ input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
+ input_report_abs(dev, ABS_MT_POSITION_X, x);
+ input_report_abs(dev, ABS_MT_POSITION_Y, y);
+ input_report_abs(dev, ABS_MT_TOUCH_MAJOR, z);
+}
+
+static void cyttsp_report_slot_empty(struct input_dev *dev, int slot)
+{
+ input_mt_slot(dev, slot);
+ input_mt_report_slot_state(dev, MT_TOOL_FINGER, false);
+}
+
+static void cyttsp_extract_track_ids(struct cyttsp_xydata *xy_data, int *ids)
+{
+ ids[0] = xy_data->touch12_id >> 4;
+ ids[1] = xy_data->touch12_id & 0xF;
+ ids[2] = xy_data->touch34_id >> 4;
+ ids[3] = xy_data->touch34_id & 0xF;
+}
+
+static const struct cyttsp_tch *cyttsp_get_tch(struct cyttsp_xydata *xy_data,
+ int idx)
+{
+ switch (idx) {
+ case 0:
+ return &xy_data->tch1;
+ case 1:
+ return &xy_data->tch2;
+ case 2:
+ return &xy_data->tch3;
+ case 3:
+ return &xy_data->tch4;
+ default:
+ return NULL;
+ }
+}
+
+static int cyttsp_handle_tchdata(struct cyttsp *ts)
+{
+ struct cyttsp_xydata xy_data;
+ u8 num_cur_tch;
+ int i;
+ int ids[4];
+ const struct cyttsp_tch *tch = NULL;
+ int x, y, z;
+ int used = 0;
+
+ /* Get touch data from CYTTSP device */
+ if (ttsp_read_block_data(ts,
+ CY_REG_BASE, sizeof(struct cyttsp_xydata), &xy_data))
+ return 0;
+
+ /* provide flow control handshake */
+ if (ts->pdata->use_hndshk)
+ if (cyttsp_hndshk(ts, xy_data.hst_mode))
+ return 0;
+
+ /* determine number of currently active touches */
+ num_cur_tch = GET_NUM_TOUCHES(xy_data.tt_stat);
+
+ /* check for any error conditions */
+ if (ts->power_state == CY_IDLE_STATE)
+ return 0;
+ else if (GET_BOOTLOADERMODE(xy_data.tt_mode)) {
+ return -1;
+ } else if (IS_LARGE_AREA(xy_data.tt_stat) == 1) {
+ /* terminate all active tracks */
+ num_cur_tch = 0;
+ dev_dbg(ts->dev, "%s: Large area detected\n", __func__);
+ } else if (num_cur_tch > CY_MAX_FINGER) {
+ /* terminate all active tracks */
+ num_cur_tch = 0;
+ dev_dbg(ts->dev, "%s: Num touch error detected\n", __func__);
+ } else if (IS_BAD_PKT(xy_data.tt_mode)) {
+ /* terminate all active tracks */
+ num_cur_tch = 0;
+ dev_dbg(ts->dev, "%s: Invalid buffer detected\n", __func__);
+ }
+
+ cyttsp_extract_track_ids(&xy_data, ids);
+
+ for (i = 0; i < num_cur_tch; i++) {
+ used |= (1 << ids[i]);
+
+ tch = cyttsp_get_tch(&xy_data, i);
+
+ x = be16_to_cpu(tch->x);
+ y = be16_to_cpu(tch->y);
+ z = tch->z;
+
+ cyttsp_report_slot(ts->input, ids[i], x, y, z);
+ }
+
+ for (i = 0; i < CY_MAX_ID; i++)
+ if (!(used & (1 << i)))
+ cyttsp_report_slot_empty(ts->input, i);
+
+ input_sync(ts->input);
+
+ return 0;
+}
+
+static void cyttsp_pr_state(struct cyttsp *ts)
+{
+ static char *cyttsp_powerstate_string[] = {
+ "IDLE",
+ "ACTIVE",
+ "LOW_PWR",
+ "SLEEP",
+ "BOOTLOADER",
+ "INVALID"
+ };
+
+ dev_info(ts->dev, "%s: %s\n", __func__,
+ ts->power_state < CY_INVALID_STATE ?
+ cyttsp_powerstate_string[ts->power_state] :
+ "INVALID");
+}
+
+static irqreturn_t cyttsp_irq(int irq, void *handle)
+{
+ struct cyttsp *ts = handle;
+ int retval;
+
+ if (ts->power_state == CY_BL_STATE)
+ complete(&ts->bl_ready);
+ else {
+ /* process the touches */
+ retval = cyttsp_handle_tchdata(ts);
+
+ if (retval < 0) {
+ /*
+ * TTSP device has reset back to bootloader mode.
+ * Restore to operational mode.
+ */
+ retval = cyttsp_exit_bl_mode(ts);
+ if (retval)
+ ts->power_state = CY_IDLE_STATE;
+ else
+ ts->power_state = CY_ACTIVE_STATE;
+ cyttsp_pr_state(ts);
+ }
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int cyttsp_power_on(struct cyttsp *ts)
+{
+ int retval = 0;
+
+ ts->power_state = CY_BL_STATE;
+ enable_irq(ts->irq);
+
+ retval = cyttsp_soft_reset(ts);
+ if (retval < 0)
+ goto bypass;
+
+ retval = cyttsp_bl_app_valid(ts);
+ if (retval < 0)
+ goto bypass;
+ else if (retval > 0)
+ goto no_bl_bypass;
+
+ retval = cyttsp_exit_bl_mode(ts);
+
+ if (retval < 0)
+ goto bypass;
+
+ ts->power_state = CY_IDLE_STATE;
+
+no_bl_bypass:
+ retval = cyttsp_set_sysinfo_mode(ts);
+ if (retval < 0)
+ goto bypass;
+
+ retval = cyttsp_set_sysinfo_regs(ts);
+ if (retval < 0)
+ goto bypass;
+
+ retval = cyttsp_set_operational_mode(ts);
+ if (retval < 0)
+ goto bypass;
+
+ /* init active distance */
+ retval = cyttsp_act_dist_setup(ts);
+ if (retval < 0)
+ goto bypass;
+
+ ts->power_state = CY_ACTIVE_STATE;
+ retval = 0;
+
+bypass:
+ cyttsp_pr_state(ts);
+ return retval;
+}
+
+static int __cyttsp_enable(struct cyttsp *ts)
+{
+ struct cyttsp_xydata xydata;
+ int retval = 0;
+
+ if (ts->pdata->use_sleep && ts->power_state != CY_ACTIVE_STATE) {
+
+ if (ts->pdata->wakeup)
+ retval = ts->pdata->wakeup();
+ else
+ retval = -ENOSYS;
+
+ if (retval >= 0) {
+ retval = ttsp_read_block_data(ts, CY_REG_BASE,
+ sizeof(xydata),
+ &xydata);
+ if (retval >= 0 &&
+ !GET_HSTMODE(xydata.hst_mode)) {
+ ts->power_state = CY_ACTIVE_STATE;
+ enable_irq(ts->irq);
+ }
+ }
+ }
+
+ return retval;
+}
+
+static int __cyttsp_disable(struct cyttsp *ts)
+{
+ u8 sleep_mode = 0;
+ int retval = 0;
+
+ if (ts->pdata->use_sleep && ts->power_state == CY_ACTIVE_STATE) {
+ sleep_mode = ts->pdata->use_sleep;
+ retval = ttsp_write_block_data(ts, CY_REG_BASE,
+ sizeof(sleep_mode), &sleep_mode);
+ if (retval >= 0) {
+ ts->power_state = CY_SLEEP_STATE;
+ disable_irq(ts->irq);
+ }
+ }
+
+ return retval;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int cyttsp_resume(struct device *dev)
+{
+ struct cyttsp *ts = dev_get_drvdata(dev);
+ int retval = 0;
+
+ mutex_lock(&ts->input->mutex);
+
+ if (ts->suspended)
+ retval = __cyttsp_enable(ts);
+
+ ts->suspended = false;
+
+ mutex_unlock(&ts->input->mutex);
+
+ return retval;
+}
+
+static int cyttsp_suspend(struct device *dev)
+{
+ struct cyttsp *ts = dev_get_drvdata(dev);
+ int retval = 0;
+
+ mutex_lock(&ts->input->mutex);
+
+ if (!ts->suspended)
+ retval = __cyttsp_disable(ts);
+
+ ts->suspended = true;
+
+ mutex_unlock(&ts->input->mutex);
+
+ return retval;
+}
+#endif
+
+SIMPLE_DEV_PM_OPS(cyttsp_pm_ops, cyttsp_suspend, cyttsp_resume);
+EXPORT_SYMBOL_GPL(cyttsp_pm_ops);
+
+static int cyttsp_open(struct input_dev *dev)
+{
+ struct cyttsp *ts = input_get_drvdata(dev);
+ int retval = 0;
+
+ if (!ts->on) {
+ retval = cyttsp_power_on(ts);
+
+ if (retval)
+ return retval;
+ else
+ ts->on = true;
+ }
+
+ if (!ts->suspended)
+ retval = __cyttsp_enable(ts);
+
+ return retval;
+}
+
+static void cyttsp_close(struct input_dev *dev)
+{
+ struct cyttsp *ts = input_get_drvdata(dev);
+
+ if (!ts->suspended)
+ __cyttsp_disable(ts);
+}
+
+struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,
+ struct device *dev, int irq, size_t xfer_buf_size)
+{
+ const struct cyttsp_platform_data *pdata = dev->platform_data;
+ struct cyttsp *ts;
+ struct input_dev *input_dev;
+ int error;
+
+ if (!dev || !bus_ops || !pdata || !pdata->name || irq <= 0) {
+ error = -EINVAL;
+ goto err_out;
+ }
+
+ ts = kzalloc(sizeof(*ts) + xfer_buf_size, GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (!ts || !input_dev) {
+ error = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ ts->dev = dev;
+ ts->input = input_dev;
+ ts->pdata = dev->platform_data;
+ ts->bus_ops = bus_ops;
+ ts->irq = irq;
+ ts->suspended = false;
+ ts->on = false;
+
+ init_completion(&ts->bl_ready);
+ snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
+
+ if (pdata->init) {
+ error = pdata->init();
+ if (error) {
+ dev_err(ts->dev, "platform init failed, err: %d\n",
+ error);
+ goto err_free_mem;
+ }
+ }
+
+ input_dev->name = pdata->name;
+ input_dev->phys = ts->phys;
+ input_dev->id.bustype = bus_ops->bustype;
+ input_dev->dev.parent = ts->dev;
+
+ input_dev->open = cyttsp_open;
+ input_dev->close = cyttsp_close;
+
+ input_set_drvdata(input_dev, ts);
+
+ __set_bit(EV_ABS, input_dev->evbit);
+ input_set_abs_params(input_dev, ABS_MT_POSITION_X,
+ 0, pdata->maxx, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
+ 0, pdata->maxy, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
+ 0, CY_MAXZ, 0, 0);
+
+ input_mt_init_slots(input_dev, CY_MAX_ID);
+
+ error = request_threaded_irq(ts->irq, NULL, cyttsp_irq,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ pdata->name, ts);
+ if (error) {
+ dev_err(ts->dev, "failed to request IRQ %d, err: %d\n",
+ ts->irq, error);
+ goto err_platform_exit;
+ }
+ disable_irq(ts->irq);
+
+ error = input_register_device(input_dev);
+ if (error) {
+ dev_err(ts->dev, "failed to register input device: %d\n",
+ error);
+ goto err_free_irq;
+ }
+
+ return ts;
+
+err_free_irq:
+ free_irq(ts->irq, ts);
+err_platform_exit:
+ if (pdata->exit)
+ pdata->exit();
+err_free_mem:
+ input_free_device(input_dev);
+ kfree(ts);
+err_out:
+ return ERR_PTR(error);
+}
+EXPORT_SYMBOL_GPL(cyttsp_probe);
+
+void cyttsp_remove(struct cyttsp *ts)
+{
+ free_irq(ts->irq, ts);
+ input_unregister_device(ts->input);
+ if (ts->pdata->exit)
+ ts->pdata->exit();
+ kfree(ts);
+}
+EXPORT_SYMBOL_GPL(cyttsp_remove);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard touchscreen driver core");
+MODULE_AUTHOR("Cypress");
+
diff --git a/drivers/input/touchscreen/cyttsp_core.h b/drivers/input/touchscreen/cyttsp_core.h
new file mode 100644
index 0000000..2ab0161
--- /dev/null
+++ b/drivers/input/touchscreen/cyttsp_core.h
@@ -0,0 +1,141 @@
+/*
+ * Header file for:
+ * Cypress TrueTouch(TM) Standard Product (TTSP) touchscreen drivers.
+ * For use with Cypress Txx3xx parts.
+ * Supported parts include:
+ * CY8CTST341
+ * CY8CTMA340
+ *
+ * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
+ * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, and only version 2, as published by the
+ * Free Software Foundation.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com>
+ *
+ */
+
+
+#ifndef __CYTTSP_CORE_H__
+#define __CYTTSP_CORE_H__
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/input/cyttsp.h>
+
+#define CY_NUM_RETRY 4 /* max number of retries for read ops */
+
+struct cyttsp_tch {
+ __be16 x, y;
+ u8 z;
+} __packed;
+
+/* TrueTouch Standard Product Gen3 interface definition */
+struct cyttsp_xydata {
+ u8 hst_mode;
+ u8 tt_mode;
+ u8 tt_stat;
+ struct cyttsp_tch tch1;
+ u8 touch12_id;
+ struct cyttsp_tch tch2;
+ u8 gest_cnt;
+ u8 gest_id;
+ struct cyttsp_tch tch3;
+ u8 touch34_id;
+ struct cyttsp_tch tch4;
+ u8 tt_undef[3];
+ u8 act_dist;
+ u8 tt_reserved;
+} __packed;
+
+
+/* TTSP System Information interface definition */
+struct cyttsp_sysinfo_data {
+ u8 hst_mode;
+ u8 mfg_cmd;
+ u8 mfg_stat;
+ u8 cid[3];
+ u8 tt_undef1;
+ u8 uid[8];
+ u8 bl_verh;
+ u8 bl_verl;
+ u8 tts_verh;
+ u8 tts_verl;
+ u8 app_idh;
+ u8 app_idl;
+ u8 app_verh;
+ u8 app_verl;
+ u8 tt_undef[5];
+ u8 scn_typ;
+ u8 act_intrvl;
+ u8 tch_tmout;
+ u8 lp_intrvl;
+};
+
+/* TTSP Bootloader Register Map interface definition */
+#define CY_BL_CHKSUM_OK 0x01
+struct cyttsp_bootloader_data {
+ u8 bl_file;
+ u8 bl_status;
+ u8 bl_error;
+ u8 blver_hi;
+ u8 blver_lo;
+ u8 bld_blver_hi;
+ u8 bld_blver_lo;
+ u8 ttspver_hi;
+ u8 ttspver_lo;
+ u8 appid_hi;
+ u8 appid_lo;
+ u8 appver_hi;
+ u8 appver_lo;
+ u8 cid_0;
+ u8 cid_1;
+ u8 cid_2;
+};
+
+struct cyttsp_bus_ops {
+ u16 bustype;
+ int (*write)(struct device *dev,
+ u8 addr, u8 length, const void *values);
+ int (*read)(struct device *dev, u8 addr, u8 length, void *values);
+};
+
+struct cyttsp {
+ struct device *dev;
+ int irq;
+ struct input_dev *input;
+ char phys[32];
+ const struct cyttsp_platform_data *pdata;
+ const struct cyttsp_bus_ops *bus_ops;
+ struct cyttsp_bootloader_data bl_data;
+ struct cyttsp_sysinfo_data sysinfo_data;
+ struct completion bl_ready;
+ enum cyttsp_powerstate power_state;
+ bool suspended;
+ bool on;
+
+ u8 xfer_buf[] ____cacheline_aligned;
+};
+
+struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,
+ struct device *dev, int irq, size_t xfer_buf_size);
+void cyttsp_remove(struct cyttsp *ts);
+
+extern const struct dev_pm_ops cyttsp_pm_ops;
+
+#endif /* __CYTTSP_CORE_H__ */
diff --git a/include/linux/input/cyttsp.h b/include/linux/input/cyttsp.h
new file mode 100644
index 0000000..9bebbf8
--- /dev/null
+++ b/include/linux/input/cyttsp.h
@@ -0,0 +1,69 @@
+/*
+ * Header file for:
+ * Cypress TrueTouch(TM) Standard Product (TTSP) touchscreen drivers.
+ * For use with Cypress Txx3xx parts.
+ * Supported parts include:
+ * CY8CTST341
+ * CY8CTMA340
+ *
+ * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
+ * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, and only version 2, as published by the
+ * Free Software Foundation.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contact Cypress Semiconductor at www.cypress.com (kev@cypress.com)
+ *
+ */
+#ifndef _CYTTSP_H_
+#define _CYTTSP_H_
+
+#define CY_SPI_NAME "cyttsp-spi"
+#define CY_I2C_NAME "cyttsp-i2c"
+/* Active Power state scanning/processing refresh interval */
+#define CY_ACT_INTRVL_DFLT 0x00 /* ms */
+/* touch timeout for the Active power */
+#define CY_TCH_TMOUT_DFLT 0xFF /* ms */
+/* Low Power state scanning/processing refresh interval */
+#define CY_LP_INTRVL_DFLT 0x0A /* ms */
+/* Active distance in pixels for a gesture to be reported */
+#define CY_ACT_DIST_DFLT 0xF8 /* pixels */
+
+enum cyttsp_powerstate {
+ CY_IDLE_STATE,
+ CY_ACTIVE_STATE,
+ CY_LOW_PWR_STATE,
+ CY_SLEEP_STATE,
+ CY_BL_STATE,
+ CY_INVALID_STATE /* always last in the list */
+};
+
+struct cyttsp_platform_data {
+ u32 maxx;
+ u32 maxy;
+ bool use_hndshk;
+ bool use_sleep;
+ u8 act_dist; /* Active distance */
+ u8 act_intrvl; /* Active refresh interval; ms */
+ u8 tch_tmout; /* Active touch timeout; ms */
+ u8 lp_intrvl; /* Low power refresh interval; ms */
+ int (*wakeup)(void);
+ int (*init)(void);
+ void (*exit)(void);
+ char *name;
+ s16 irq_gpio;
+ u8 *bl_keys;
+};
+
+#endif /* _CYTTSP_H_ */
--
1.7.4.1
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v8 2/3] Input: cyttsp - add support for Cypress TTSP touchscreen I2C bus interface
2012-01-05 0:16 [PATCH v8 0/3] Input: Cypress TTSP device driver Javier Martinez Canillas
2012-01-05 0:16 ` [PATCH v8 1/3] Input: cyttsp - Cypress TTSP capacitive multi-touch screen support Javier Martinez Canillas
@ 2012-01-05 0:16 ` Javier Martinez Canillas
2012-01-05 0:16 ` [PATCH v8 3/3] Input: cyttsp - add support for Cypress TTSP touchscreen SPI " Javier Martinez Canillas
2 siblings, 0 replies; 6+ messages in thread
From: Javier Martinez Canillas @ 2012-01-05 0:16 UTC (permalink / raw)
To: Dmitry Torokhov
Cc: Henrik Rydberg, Mohan Pallaka, Kevin McNeely, Shubhrajyoti Datta,
linux-input, linux-kernel, Javier Martinez Canillas
The driver is composed of a core driver that process the data sent by
the contacts and a set of bus specific interface modules.
This patch add supports for the Cypress TTSP I2C bus interface.
Signed-off-by: Javier Martinez Canillas <javier@dowhile0.org>
---
Changes for v8:
Javier Martinez Canillas (5):
- Check i2c_master_recv() didn't return and error before checking length
- Check i2c read completed sucessful
- Define module exit macro in i2c driver
- Fix return values for I2C transport
- Add error msg when capability is not supported
drivers/input/touchscreen/cyttsp_i2c.c | 137 ++++++++++++++++++++++++++++++++
1 files changed, 137 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/touchscreen/cyttsp_i2c.c
diff --git a/drivers/input/touchscreen/cyttsp_i2c.c b/drivers/input/touchscreen/cyttsp_i2c.c
new file mode 100644
index 0000000..cdbf61d
--- /dev/null
+++ b/drivers/input/touchscreen/cyttsp_i2c.c
@@ -0,0 +1,137 @@
+/*
+ * Source for:
+ * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver.
+ * For use with Cypress Txx3xx parts.
+ * Supported parts include:
+ * CY8CTST341
+ * CY8CTMA340
+ *
+ * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
+ * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, and only version 2, as published by the
+ * Free Software Foundation.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com>
+ *
+ */
+
+#include "cyttsp_core.h"
+
+#include <linux/i2c.h>
+#include <linux/input.h>
+
+#define CY_I2C_DATA_SIZE 128
+
+static int cyttsp_i2c_read_block_data(struct device *dev,
+ u8 addr, u8 length, void *values)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int retval;
+
+ retval = i2c_master_send(client, &addr, 1);
+ if (retval < 0)
+ return retval;
+
+ retval = i2c_master_recv(client, values, length);
+
+ if (retval < 0)
+ return retval;
+
+ return (retval != length) ? -EIO : 0;
+}
+
+static int cyttsp_i2c_write_block_data(struct device *dev,
+ u8 addr, u8 length, const void *values)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct cyttsp *ts = i2c_get_clientdata(client);
+ int retval;
+
+ ts->xfer_buf[0] = addr;
+ memcpy(&ts->xfer_buf[1], values, length);
+ retval = i2c_master_send(client, ts->xfer_buf, length + 1);
+
+ return (retval < 0) ? retval : 0;
+}
+
+static const struct cyttsp_bus_ops cyttsp_i2c_bus_ops = {
+ .bustype = BUS_I2C,
+ .write = cyttsp_i2c_write_block_data,
+ .read = cyttsp_i2c_read_block_data,
+};
+
+static int __devinit cyttsp_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct cyttsp *ts;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(&client->dev, "I2C functionality not Supported\n");
+ return -EIO;
+ }
+
+ ts = cyttsp_probe(&cyttsp_i2c_bus_ops, &client->dev, client->irq,
+ CY_I2C_DATA_SIZE);
+
+ if (IS_ERR(ts))
+ return PTR_ERR(ts);
+
+ i2c_set_clientdata(client, ts);
+
+ return 0;
+}
+
+static int __devexit cyttsp_i2c_remove(struct i2c_client *client)
+{
+ struct cyttsp *ts = i2c_get_clientdata(client);
+
+ cyttsp_remove(ts);
+
+ return 0;
+}
+
+static const struct i2c_device_id cyttsp_i2c_id[] = {
+ { CY_I2C_NAME, 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, cyttsp_i2c_id);
+
+static struct i2c_driver cyttsp_i2c_driver = {
+ .driver = {
+ .name = CY_I2C_NAME,
+ .owner = THIS_MODULE,
+ .pm = &cyttsp_pm_ops,
+ },
+ .probe = cyttsp_i2c_probe,
+ .remove = __devexit_p(cyttsp_i2c_remove),
+ .id_table = cyttsp_i2c_id,
+};
+
+static int __init cyttsp_i2c_init(void)
+{
+ return i2c_add_driver(&cyttsp_i2c_driver);
+}
+module_init(cyttsp_i2c_init);
+
+static void __exit cyttsp_i2c_exit(void)
+{
+ return i2c_del_driver(&cyttsp_i2c_driver);
+}
+module_exit(cyttsp_i2c_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver");
+MODULE_AUTHOR("Cypress");
+MODULE_ALIAS("i2c:cyttsp");
--
1.7.4.1
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v8 3/3] Input: cyttsp - add support for Cypress TTSP touchscreen SPI bus interface
2012-01-05 0:16 [PATCH v8 0/3] Input: Cypress TTSP device driver Javier Martinez Canillas
2012-01-05 0:16 ` [PATCH v8 1/3] Input: cyttsp - Cypress TTSP capacitive multi-touch screen support Javier Martinez Canillas
2012-01-05 0:16 ` [PATCH v8 2/3] Input: cyttsp - add support for Cypress TTSP touchscreen I2C bus interface Javier Martinez Canillas
@ 2012-01-05 0:16 ` Javier Martinez Canillas
2 siblings, 0 replies; 6+ messages in thread
From: Javier Martinez Canillas @ 2012-01-05 0:16 UTC (permalink / raw)
To: Dmitry Torokhov
Cc: Henrik Rydberg, Mohan Pallaka, Kevin McNeely, Shubhrajyoti Datta,
linux-input, linux-kernel, Javier Martinez Canillas
The driver is composed of a core driver that process the data sent by
the contacts and a set of bus specific interface modules.
This patch add supports for the Cypress TTSP SPI bus interface.
Signed-off-by: Javier Martinez Canillas <javier@dowhile0.org>
---
Changes for v8:
Javier Martinez Canillas (2):
- struct cyttsp is inside struct device not struct spi_device
- Add error msg when capability is not supported
Kevin McNeely (1):
- SPI xfer function cleanups
drivers/input/touchscreen/cyttsp_spi.c | 245 ++++++++++++++++++++++++++++++++
1 files changed, 245 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/touchscreen/cyttsp_spi.c
diff --git a/drivers/input/touchscreen/cyttsp_spi.c b/drivers/input/touchscreen/cyttsp_spi.c
new file mode 100644
index 0000000..3238c7d
--- /dev/null
+++ b/drivers/input/touchscreen/cyttsp_spi.c
@@ -0,0 +1,245 @@
+/*
+ * Source for:
+ * Cypress TrueTouch(TM) Standard Product (TTSP) SPI touchscreen driver.
+ * For use with Cypress Txx3xx parts.
+ * Supported parts include:
+ * CY8CTST341
+ * CY8CTMA340
+ *
+ * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
+ * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, and only version 2, as published by the
+ * Free Software Foundation.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com>
+ *
+ */
+
+#include "cyttsp_core.h"
+
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/spi/spi.h>
+
+#define CY_SPI_WR_OP 0x00 /* r/~w */
+#define CY_SPI_RD_OP 0x01
+#define CY_SPI_CMD_BYTES 4
+#define CY_SPI_SYNC_BYTE 2
+#define CY_SPI_SYNC_ACK1 0x62 /* from protocol v.2 */
+#define CY_SPI_SYNC_ACK2 0x9D /* from protocol v.2 */
+#define CY_SPI_DATA_SIZE 128
+#define CY_SPI_DATA_BUF_SIZE (CY_SPI_CMD_BYTES + CY_SPI_DATA_SIZE)
+#define CY_SPI_BITS_PER_WORD 8
+
+static int cyttsp_spi_xfer(u8 op, struct spi_device *spi,
+ u8 reg, u8 *buf, int length)
+{
+ struct cyttsp *ts = spi_get_drvdata(spi);
+ struct spi_message msg;
+ struct spi_transfer xfer[2];
+ u8 *wr_buf = &ts->xfer_buf[0];
+ u8 *rd_buf = &ts->xfer_buf[CY_SPI_DATA_BUF_SIZE];
+ int retval;
+
+ if (length > CY_SPI_DATA_SIZE) {
+ dev_dbg(&spi->dev, "%s: length %d is too big.\n",
+ __func__, length);
+ return -EINVAL;
+ }
+
+ memset(wr_buf, 0, CY_SPI_DATA_BUF_SIZE);
+ memset(rd_buf, 0, CY_SPI_DATA_BUF_SIZE);
+
+ wr_buf[0] = 0x00; /* header byte 0 */
+ wr_buf[1] = 0xFF; /* header byte 1 */
+ wr_buf[2] = reg; /* reg index */
+ wr_buf[3] = op; /* r/~w */
+ if (op == CY_SPI_WR_OP)
+ memcpy(wr_buf + CY_SPI_CMD_BYTES, buf, length);
+
+ memset(xfer, 0, sizeof(xfer));
+ spi_message_init(&msg);
+
+ /*
+ We set both TX and RX buffers because Cypress TTSP
+ requires full duplex operation.
+ */
+ xfer[0].tx_buf = wr_buf;
+ xfer[0].rx_buf = rd_buf;
+ switch (op) {
+ case CY_SPI_WR_OP:
+ xfer[0].len = length + CY_SPI_CMD_BYTES;
+ spi_message_add_tail(&xfer[0], &msg);
+ break;
+
+ case CY_SPI_RD_OP:
+ xfer[0].len = CY_SPI_CMD_BYTES;
+ spi_message_add_tail(&xfer[0], &msg);
+
+ xfer[1].rx_buf = buf;
+ xfer[1].len = length;
+ spi_message_add_tail(&xfer[1], &msg);
+ break;
+
+ default:
+ dev_dbg(&spi->dev,
+ "%s: bad operation code=%d\n", __func__, op);
+ return -EINVAL;
+ }
+
+ retval = spi_sync(spi, &msg);
+ if (retval < 0) {
+ dev_dbg(&spi->dev,
+ "%s: spi_sync() error %d, len=%d, op=%d\n",
+ __func__, retval, xfer[1].len, op);
+
+ /*
+ * do not return here since was a bad ACK sequence
+ * let the following ACK check handle any errors and
+ * allow silent retries
+ */
+ }
+
+ if (rd_buf[CY_SPI_SYNC_BYTE] != CY_SPI_SYNC_ACK1 ||
+ rd_buf[CY_SPI_SYNC_BYTE + 1] != CY_SPI_SYNC_ACK2) {
+ int i;
+ for (i = 0; i < CY_SPI_CMD_BYTES; i++)
+ dev_dbg(&spi->dev,
+ "%s: test rd_buf[%d]:0x%02x\n",
+ __func__, i, rd_buf[i]);
+ for (i = 0; i < length; i++)
+ dev_dbg(&spi->dev,
+ "%s: test buf[%d]:0x%02x\n",
+ __func__, i, buf[i]);
+
+ /* signal ACK error so silent retry */
+ return 1;
+ }
+
+ return 0;
+}
+
+static int cyttsp_spi_read_block_data(struct device *dev,
+ u8 addr, u8 length, void *data)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ int retval;
+
+ retval = cyttsp_spi_xfer(CY_SPI_RD_OP, spi, addr, data, length);
+ if (retval < 0)
+ dev_err(dev, "cyttsp_spi_read_block_data failed, err: %d\n",
+ retval);
+
+ /*
+ * Do not print the above error if the data sync bytes were not found.
+ * This is a normal condition for the bootloader loader startup and need
+ * to retry until data sync bytes are found.
+ */
+ if (retval > 0)
+ retval = -EIO; /* now signal fail; so retry can be done */
+
+ return retval;
+}
+
+static int cyttsp_spi_write_block_data(struct device *dev,
+ u8 addr, u8 length, const void *data)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ int retval;
+
+ retval = cyttsp_spi_xfer(CY_SPI_WR_OP, spi, addr, (void *)data, length);
+ if (retval < 0)
+ dev_err(dev, "cyttsp_spi_write_block_data failed, err: %d\n",
+ retval);
+
+ /*
+ * Do not print the above error if the data sync bytes were not found.
+ * This is a normal condition for the bootloader loader startup and need
+ * to retry until data sync bytes are found.
+ */
+ if (retval > 0)
+ retval = -EIO; /* now signal fail; so retry can be done */
+
+ return retval;
+}
+
+static const struct cyttsp_bus_ops cyttsp_spi_bus_ops = {
+ .bustype = BUS_SPI,
+ .write = cyttsp_spi_write_block_data,
+ .read = cyttsp_spi_read_block_data,
+};
+
+static int __devinit cyttsp_spi_probe(struct spi_device *spi)
+{
+ struct cyttsp *ts;
+ int error;
+
+ /* Set up SPI*/
+ spi->bits_per_word = CY_SPI_BITS_PER_WORD;
+ spi->mode = SPI_MODE_0;
+ error = spi_setup(spi);
+ if (error < 0) {
+ dev_err(&spi->dev, "%s: SPI setup error %d\n",
+ __func__, error);
+ return error;
+ }
+
+ ts = cyttsp_probe(&cyttsp_spi_bus_ops, &spi->dev, spi->irq,
+ CY_SPI_DATA_BUF_SIZE * 2);
+ if (IS_ERR(ts))
+ return PTR_ERR(ts);
+
+ spi_set_drvdata(spi, ts);
+
+ return 0;
+}
+
+static int __devexit cyttsp_spi_remove(struct spi_device *spi)
+{
+ struct cyttsp *ts = dev_get_drvdata(&spi->dev);
+
+ cyttsp_remove(ts);
+
+ return 0;
+}
+
+static struct spi_driver cyttsp_spi_driver = {
+ .driver = {
+ .name = CY_SPI_NAME,
+ .owner = THIS_MODULE,
+ .pm = &cyttsp_pm_ops,
+ },
+ .probe = cyttsp_spi_probe,
+ .remove = __devexit_p(cyttsp_spi_remove),
+};
+
+static int __init cyttsp_spi_init(void)
+{
+ return spi_register_driver(&cyttsp_spi_driver);
+}
+module_init(cyttsp_spi_init);
+
+static void __exit cyttsp_spi_exit(void)
+{
+ spi_unregister_driver(&cyttsp_spi_driver);
+}
+module_exit(cyttsp_spi_exit);
+
+MODULE_ALIAS("spi:cyttsp");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) SPI driver");
+MODULE_AUTHOR("Cypress");
+MODULE_ALIAS("spi:cyttsp");
+
--
1.7.4.1
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