RE: [v3 1/3] 1/3 Touchscreen: Cypress TTSP G3 MTDEV Core Driver

Shubhrajyoti Datta
2010-12-30T06:05:07Z

Hi Kevin,
Some minor comments.

> -----Original Message-----
> From: linux-input-owner@vger.kernel.org [mailto:linux-input-
> owner@vger.kernel.org] On Behalf Of Kevin McNeely
> Sent: Thursday, December 30, 2010 12:48 AM
> To: Dmitry Torokhov
> Cc: David Brown; Trilok Soni; Kevin McNeely; Dmitry Torokhov; Henrik
> Rydberg; Samuel Ortiz; Eric Miao; Mike Frysinger; Alan Cox; linux-
> input@vger.kernel.org; linux-kernel@vger.kernel.org
> Subject: [v3 1/3] 1/3 Touchscreen: Cypress TTSP G3 MTDEV Core Driver
>
> Cypress TTSP Gen3 Core Driver.
> Core Driver includes platform data definition file,
> core driver definition file, and core touchscreen
> touch handling of device data. Generates
> multi-touch input events.
>
> Signed-off-by: Kevin McNeely <kev@cypress.com>
> ---
> Changes since v2:
> - Simplified Protocol A
> - Modified pointed out driver writing style
>
> drivers/input/touchscreen/Kconfig | 5 +
> drivers/input/touchscreen/Makefile | 1 +
> drivers/input/touchscreen/cyttsp_core.c | 808
> +++++++++++++++++++++++++++++++
> drivers/input/touchscreen/cyttsp_core.h | 55 +++
> include/linux/input/cyttsp.h | 68 +++
> 5 files changed, 937 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 06ea8da..7d886bc 100644
> --- a/drivers/input/touchscreen/Kconfig
> +++ b/drivers/input/touchscreen/Kconfig
> @@ -124,6 +124,11 @@ config TOUCHSCREEN_CY8CTMG110
> To compile this driver as a module, choose M here: the
> module will be called cy8ctmg110_ts.
>
> +config TOUCHSCREEN_CYTTSP_CORE
> + bool "Cypress TTSP touchscreen core"
> + help
> + Always activated for Cypress TTSP touchscreen
> +
> 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 7cc1b4f..b6f1ba8 100644
> --- a/drivers/input/touchscreen/Makefile
> +++ b/drivers/input/touchscreen/Makefile
> @@ -16,6 +16,7 @@ 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_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..21a342f
> --- /dev/null
> +++ b/drivers/input/touchscreen/cyttsp_core.c
> @@ -0,0 +1,808 @@
> +/*
> + * 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 Cypress Semiconductor, Inc.
> + *
> + * 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/gpio.h>
> +#include <linux/interrupt.h>
> +#include <linux/slab.h>
> +
> +/* Bootloader File 0 offset */
> +#define CY_BL_FILE0 0x00
> +/* Bootloader command directive */
> +#define CY_BL_CMD 0xFF
> +/* Bootloader Exit and Verify Checksum command */
> +#define CY_BL_EXIT 0xA5
> +/* Bootloader number of command keys */
> +#define CY_NUM_BL_KEYS 8
> +/* Bootloader default command keys */
> +#define CY_BL_KEY0 0
> +#define CY_BL_KEY1 1
> +#define CY_BL_KEY2 2
> +#define CY_BL_KEY3 3
> +#define CY_BL_KEY4 4
> +#define CY_BL_KEY5 5
> +#define CY_BL_KEY6 6
> +#define CY_BL_KEY7 7
> +
> +/* 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/CY_DELAY_DFLT) /* half second
*/
> +#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
> +
> +/* TrueTouch Standard Product Gen3 interface definition */
> +struct cyttsp_xydata {
> + u8 hst_mode;
> + u8 tt_mode;
> + u8 tt_stat;
> + u8 tch1_xhi;
> + u8 tch1_xlo;
> + u8 tch1_yhi;
> + u8 tch1_ylo;
> + u8 tch1_z;
> + u8 unused;
> + u8 tch2_xhi;
> + u8 tch2_xlo;
> + u8 tch2_yhi;
> + u8 tch2_ylo;
> + u8 tch2_z;
> + u8 unused_grp[13];
> + u8 tt_undef[3];
> + u8 act_dist;
> + u8 tt_reserved;
> +};
> +
> +/* 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_tch {
> + u16 x;
> + u16 y;
> + u8 z;
> +};
> +
> +struct cyttsp {
> + struct device *dev;
> + int irq;
> + struct input_dev *input;
> + struct mutex mutex;
> + char phys[32];
> + const struct bus_type *bus_type;
> + const struct cyttsp_platform_data *platform_data;
> + struct cyttsp_bus_ops *bus_ops;
> + struct cyttsp_xydata xy_data;
> + struct cyttsp_bootloader_data bl_data;
> + struct cyttsp_sysinfo_data sysinfo_data;
> + struct completion bl_ready;
> + enum cyttsp_powerstate power_state;
> +};
> +
> +static const u8 bl_command[] = {
> + CY_BL_FILE0, CY_BL_CMD, CY_BL_EXIT,
> + CY_BL_KEY0, CY_BL_KEY1, CY_BL_KEY2,
> + CY_BL_KEY3, CY_BL_KEY4, CY_BL_KEY5,
> + CY_BL_KEY6, CY_BL_KEY7
> +};
> +
> +static int ttsp_read_block_data(struct cyttsp *ts, u8 command,
> + u8 length, void *buf)
> +{
> + int retval;
> + int tries;
> +
> + if (!buf || !length)
> + return -EIO;
> +
> + for (tries = 0, retval = -1;
> + tries < CY_NUM_RETRY && (retval < 0);
> + tries++)
> + retval = ts->bus_ops->read(ts->bus_ops, command, length,
buf);
> +
> + return retval;
> +}
> +
> +static int ttsp_write_block_data(struct cyttsp *ts, u8 command,
> + u8 length, void *buf)
> +{
> + int retval;
> + if (!buf || !length)
> + return -EIO;
> +
> + retval = ts->bus_ops->write(ts->bus_ops, command, length, buf);
> +
> + return retval;
> +}
> +
> +static int ttsp_tch_ext(struct cyttsp *ts, void *buf)
> +{
> + int retval;
> +
> + if (!buf)
> + return -EIO;
> +
> + retval = ts->bus_ops->ext(ts->bus_ops, buf);
> +
> + return retval;
> +}
> +
> +static int cyttsp_load_bl_regs(struct cyttsp *ts)
> +{
> + int retval;
> +
> + memset(&(ts->bl_data), 0, sizeof(struct cyttsp_bootloader_data));
> +
> + retval = ttsp_read_block_data(ts, CY_REG_BASE,
> + sizeof(ts->bl_data), &(ts->bl_data));
> +
> + return retval;
> +}
> +
> +static int cyttsp_bl_app_valid(struct cyttsp *ts)
> +{
> + int retval;
> +
> + retval = cyttsp_load_bl_regs(ts);
> +
> + if (retval < 0)
> + return -ENODEV;
> +
> + if (GET_BOOTLOADERMODE(ts->bl_data.bl_status)) {
> + if (IS_VALID_APP(ts->bl_data.bl_status)) {
> + dev_dbg(ts->dev, "%s: App found; normal boot\n",
> + __func__);
> + return 0;
> + } else {
> + dev_dbg(ts->dev, "%s: NO APP; load firmware!!\n",
> + __func__);
> + return -ENODEV;
> + }
> + } else if (GET_HSTMODE(ts->bl_data.bl_file) == CY_OPERATE_MODE) {
> + if (!(IS_OPERATIONAL_ERR(ts->bl_data.bl_status))) {
> + dev_dbg(ts->dev, "%s: Operational\n",
> + __func__);
> + return 1;
> + } else {
> + dev_dbg(ts->dev, "%s: Operational failure\n",
> + __func__);
> + return -ENODEV;
> + }
> + } else {
> + dev_dbg(ts->dev, "%s: Non-Operational failure\n",
> + __func__);
> + return -ENODEV;
> + }
> +
> +}
> +
> +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->platform_data->bl_keys)
> + memcpy(&bl_cmd[sizeof(bl_command) - CY_NUM_BL_KEYS],
> + ts->platform_data->bl_keys, sizeof(bl_command));
> +
> + dev_dbg(ts->dev,
> + "%s: bl_cmd= "
> + "%02X %02X %02X %02X %02X %02X %02X %02X %02X %02X
%02X\n",
> + __func__, bl_cmd[0], bl_cmd[1], bl_cmd[2],
> + bl_cmd[3], bl_cmd[4], bl_cmd[5], bl_cmd[6],
> + bl_cmd[7], bl_cmd[8], bl_cmd[9], bl_cmd[10]);
> +
> + 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 == 0) &&
> + !GET_BOOTLOADERMODE(ts->bl_data.bl_status)) &&
> + (tries++ < CY_DELAY_MAX));
> +
> + dev_dbg(ts->dev, "%s: check bl ready tries=%d ret=%d stat=%02X\n",
> + __func__, tries, retval, ts->bl_data.bl_status);
> +
> + if (retval < 0)
> + return retval;
> + else if (GET_BOOTLOADERMODE(ts->bl_data.bl_status))
> + return -ENODEV;
> + else
> + return 0;
> +}
> +
> +static int cyttsp_set_operational_mode(struct cyttsp *ts)
> +{
> + int retval;
> + int tries;
> + 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 */
> + tries = 0;
> + do {
> + msleep(CY_DELAY_DFLT);
> + retval = ttsp_read_block_data(ts, CY_REG_BASE,
> + sizeof(ts->xy_data), &(ts->xy_data));
> + } while (!((retval == 0) &&
> + (ts->xy_data.act_dist == CY_ACT_DIST_DFLT)) &&
> + (tries++ < CY_DELAY_MAX));
> +
> + dev_dbg(ts->dev, "%s: check op ready tries=%d ret=%d dist=%02X\n",
> + __func__, tries, retval, ts->xy_data.act_dist);
> +
> + 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 == 0) &&
> + !((ts->sysinfo_data.tts_verh == 0) &&
> + (ts->sysinfo_data.tts_verl == 0))) &&
> + (tries++ < CY_DELAY_MAX));
> +
> + dev_dbg(ts->dev, "%s: check sysinfo ready tries=%d ret=%d\n",
> + __func__, tries, retval);
> +
> + dev_info(ts->dev, "%s: tv=%02X%02X ai=0x%02X%02X "
> + "av=0x%02X%02X ci=0x%02X%02X%02X\n", "cyttsp",
> + ts->sysinfo_data.tts_verh, ts->sysinfo_data.tts_verl,
> + ts->sysinfo_data.app_idh, ts->sysinfo_data.app_idl,
> + ts->sysinfo_data.app_verh, ts->sysinfo_data.app_verl,
> + ts->sysinfo_data.cid[0], ts->sysinfo_data.cid[1],
> + ts->sysinfo_data.cid[2]);
> +
> + return retval;
> +}
> +
> +static int cyttsp_set_sysinfo_regs(struct cyttsp *ts)
> +{
> + int retval = 0;
> +
> + if (ts->platform_data->act_intrvl != CY_ACT_INTRVL_DFLT ||
> + ts->platform_data->tch_tmout != CY_TCH_TMOUT_DFLT ||
> + ts->platform_data->lp_intrvl != CY_LP_INTRVL_DFLT) {
> +
> + u8 intrvl_ray[3];
> +
> + intrvl_ray[0] = ts->platform_data->act_intrvl;
> + intrvl_ray[1] = ts->platform_data->tch_tmout;
> + intrvl_ray[2] = ts->platform_data->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;
> +
> + retval = ttsp_write_block_data(ts, CY_REG_BASE, sizeof(cmd),
&cmd);
> + if (retval < 0)
> + return retval;
> +
> + /* wait for interrupt to set ready completion */
> + INIT_COMPLETION(ts->bl_ready);
> +
> + retval = wait_for_completion_interruptible_timeout(&ts->bl_ready,
> + msecs_to_jiffies(CY_DELAY_DFLT * CY_DELAY_MAX));
> +
> + if (retval > 0)
> + retval = 0;
> +
> + return retval;
> +}
> +
> +static int cyttsp_act_dist_setup(struct cyttsp *ts)
> +{
> + int retval;
> + u8 act_dist_setup;
> +
> + /* Init gesture; active distance setup */
> + act_dist_setup = ts->platform_data->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)
> +{
> + int retval;
> + u8 cmd;
> +
> + cmd = hst_mode & CY_HNDSHK_BIT ?
> + hst_mode & ~CY_HNDSHK_BIT :
> + hst_mode | CY_HNDSHK_BIT;
> +
> + retval = ttsp_write_block_data(ts, CY_REG_BASE,
> + sizeof(cmd), (u8 *)&cmd);
> +
> + return retval;
> +}
> +
> +/* process current touches */
> +static int cyttsp_xy_worker(struct cyttsp *ts)
> +{
> + u8 num_cur_tch = 0;
> + u16 x;
> + u16 y;
> + u8 z;
> +
> + /* Get touch data from CYTTSP device */
> + if (ttsp_read_block_data(ts,
> + CY_REG_BASE, sizeof(struct cyttsp_xydata), &ts->xy_data))
> + return 0;
> +
> + /* touch extension handling */
> + if (ttsp_tch_ext(ts, &ts->xy_data))
> + return 0;
> +
> + /* provide flow control handshake */
> + if (ts->platform_data->use_hndshk)
> + if (cyttsp_hndshk(ts, ts->xy_data.hst_mode))
> + return 0;
> +
> + /* determine number of currently active touches */
> + num_cur_tch = GET_NUM_TOUCHES(ts->xy_data.tt_stat);
> +
> + /* check for any error conditions */
> + if (ts->power_state == CY_IDLE_STATE)
> + return 0;
> + else if (GET_BOOTLOADERMODE(ts->xy_data.tt_mode)) {
> + return -1;
> + } else if (IS_LARGE_AREA(ts->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 > 2) {
> + /* terminate all active tracks */
> + num_cur_tch = 0;
> + dev_dbg(ts->dev, "%s: Num touch error detected\n",
__func__);
> + } else if (IS_BAD_PKT(ts->xy_data.tt_mode)) {
> + /* terminate all active tracks */
> + num_cur_tch = 0;
> + dev_dbg(ts->dev, "%s: Invalid buffer detected\n",
__func__);
> + }
> +
> + /* send touches */
> + if (!num_cur_tch)
> + /* terminate previous active touch */
> + input_mt_sync(ts->input);
> +
> + if (num_cur_tch) {
> + /* send touch 1 */
> + /*
> + * If there is only one current active touch,
> + * it will be reported in the touch 1 regardless
> + * if it was reported in the touch 2 previously
> + */
> + x = (ts->xy_data.tch1_xhi << 8) + ts->xy_data.tch1_xlo;
> + y = (ts->xy_data.tch1_yhi << 8) + ts->xy_data.tch1_ylo;
> + z = ts->xy_data.tch1_z;
> + input_report_abs(ts->input, ABS_MT_POSITION_X, x);
> + input_report_abs(ts->input, ABS_MT_POSITION_Y, y);
> + input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, z);
> + input_mt_sync(ts->input);
> + }
> +
> + if (num_cur_tch > 1) {
> + /* send touch 2 */
> + x = (ts->xy_data.tch2_xhi << 8) + ts->xy_data.tch2_xlo;
> + y = (ts->xy_data.tch2_yhi << 8) + ts->xy_data.tch2_ylo;
> + z = ts->xy_data.tch2_z;
> + input_report_abs(ts->input, ABS_MT_POSITION_X, x);
> + input_report_abs(ts->input, ABS_MT_POSITION_Y, y);
> + input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, z);
> + input_mt_sync(ts->input);
> + }
> +
> + 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_xy_worker(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;
> +
> + if (!ts)
> + return -ENOMEM;
> +
> + ts->power_state = CY_BL_STATE;
> +
> + /* enable interrupts */
> + retval = request_threaded_irq(ts->irq, NULL, cyttsp_irq,
> + IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> + ts->platform_data->name, ts);
> + if (retval < 0)
> + goto bypass;
> +
> + 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;
> +}
> +
> +#ifdef CONFIG_PM
> +int cyttsp_resume(void *handle)
> +{
> + struct cyttsp *ts = handle;
> + int retval = 0;
> + struct cyttsp_xydata xydata;
> +
> + if (ts->platform_data->use_sleep && (ts->power_state !=
> + CY_ACTIVE_STATE)) {
> + if (ts->platform_data->wakeup) {
> + retval = ts->platform_data->wakeup();
> + if (retval < 0)
> + dev_dbg(ts->dev, "%s: Error, wakeup
failed!\n",
> + __func__);
> + } else {
> + dev_dbg(ts->dev, "%s: Error, wakeup not
implemented "
> + "(check board file).\n", __func__);
> + 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;
> + }
> + }
> + dev_dbg(ts->dev, "%s: Wake Up %s\n", __func__,
> + (retval < 0) ? "FAIL" : "PASS");
> + return retval;
> +}
> +EXPORT_SYMBOL_GPL(cyttsp_resume);
> +
> +int cyttsp_suspend(void *handle)
> +{
> + struct cyttsp *ts = handle;
> + u8 sleep_mode = 0;
> + int retval = 0;
> +
> + if (ts->platform_data->use_sleep &&
> + (ts->power_state == CY_ACTIVE_STATE)) {
> + sleep_mode = CY_DEEP_SLEEP_MODE;
> + retval = ttsp_write_block_data(ts,
> + CY_REG_BASE, sizeof(sleep_mode), &sleep_mode);
> + if (!(retval < 0))
> + ts->power_state = CY_SLEEP_STATE;
> + }
> + dev_dbg(ts->dev, "%s: Sleep Power state is %s\n", __func__,
> + (ts->power_state == CY_ACTIVE_STATE) ?
> + "ACTIVE" :
> + ((ts->power_state == CY_SLEEP_STATE) ?
> + "SLEEP" : "LOW POWER"));
> + return retval;
> +}
> +EXPORT_SYMBOL_GPL(cyttsp_suspend);
> +#endif
> +
> +static int cyttsp_open(struct input_dev *dev)
> +{
> + struct cyttsp *ts = input_get_drvdata(dev);
> +
> + return cyttsp_power_on(ts);
> +}
> +
> +void cyttsp_core_release(void *handle)
> +{
> + struct cyttsp *ts = handle;
> +
> + if (ts) {
> + mutex_destroy(&ts->mutex);
> + free_irq(ts->irq, ts);
> + input_unregister_device(ts->input);
> + if (ts->platform_data->exit)
> + ts->platform_data->exit();
> + kfree(ts);
> + }
> +}
> +EXPORT_SYMBOL_GPL(cyttsp_core_release);
> +
> +static void cyttsp_close(struct input_dev *dev)
> +{
> + struct cyttsp *ts = input_get_drvdata(dev);
> +
> + free_irq(ts->irq, ts);
> +}
> +
> +void *cyttsp_core_init(struct cyttsp_bus_ops *bus_ops, struct device
> *dev)
You may consider devinit as called only from probe.

> +{
> + struct input_dev *input_device;
> +
> + struct cyttsp *ts = kzalloc(sizeof(*ts), GFP_KERNEL);
> +
> + if (!ts) {
> + dev_dbg(ts->dev, "%s: Error, kzalloc\n", __func__);
> + goto error_alloc_data;
> + }
> +
> + if (dev == NULL || bus_ops == NULL) {
> + kfree(ts);
> + goto error_alloc_data;
> + }
> +
> + mutex_init(&ts->mutex);
> + ts->dev = dev;
> + ts->platform_data = dev->platform_data;
> + ts->bus_ops = bus_ops;
> + init_completion(&ts->bl_ready);
> +
> + if (ts->platform_data->init) {
> + if (ts->platform_data->init()) {
> + dev_dbg(ts->dev, "%s: Error, platform init
failed!\n",
> + __func__);
> + goto error_init;
> + }
> + }
> +
> + ts->irq = gpio_to_irq(ts->platform_data->irq_gpio);
> + if (ts->irq <= 0) {
> + dev_dbg(ts->dev, "%s: Error, failed to allocate irq\n",
> + __func__);
> + goto error_init;
> + }
> +
> + /* Create the input device and register it. */
> + input_device = input_allocate_device();
> + if (!input_device) {
> + dev_dbg(ts->dev, "%s: Error, failed to allocate input
> device\n",
> + __func__);
> + goto error_input_allocate_device;
> + }
> +
> + ts->input = input_device;
> + input_device->name = ts->platform_data->name;
> + snprintf(ts->phys, sizeof(ts->phys), "%s", dev_name(dev));
> + input_device->phys = ts->phys;
> + input_device->dev.parent = ts->dev;
> + ts->bus_type = bus_ops->dev->bus;
> + input_device->open = cyttsp_open;
> + input_device->close = cyttsp_close;
> + input_set_drvdata(input_device, ts);
> +
> + __set_bit(EV_SYN, input_device->evbit);
> + __set_bit(EV_KEY, input_device->evbit);
> + __set_bit(EV_ABS, input_device->evbit);
> +
> + input_set_abs_params(input_device, ABS_MT_POSITION_X,
> + 0, ts->platform_data->maxx, 0, 0);
> + input_set_abs_params(input_device, ABS_MT_POSITION_Y,
> + 0, ts->platform_data->maxy, 0, 0);
> + input_set_abs_params(input_device, ABS_MT_TOUCH_MAJOR,
> + 0, CY_MAXZ, 0, 0);
> +
> + if (input_register_device(input_device)) {
> + dev_dbg(ts->dev, "%s: Error, failed to register input
> device\n",
> + __func__);
> + goto error_input_register_device;
> + }
> +
> + goto no_error;
> +
> +error_input_register_device:
> + input_unregister_device(input_device);
> +error_input_allocate_device:
> + if (ts->platform_data->exit)
> + ts->platform_data->exit();
> +error_init:
> + mutex_destroy(&ts->mutex);
> + kfree(ts);
Here ts is freed however we fall back and return ts.

> +error_alloc_data:
> +no_error:
> + return ts;
> +}
> +EXPORT_SYMBOL_GPL(cyttsp_core_init);
> +
> +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..b6fa22a
> --- /dev/null
> +++ b/drivers/input/touchscreen/cyttsp_core.h
> @@ -0,0 +1,55 @@
> +/*
> + * 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 Cypress Semiconductor, Inc.
> + *
> + * 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/input/cyttsp.h>
> +
> +#define CY_NUM_RETRY 4 /* max number of retries for read
> ops */
> +
> +
> +struct cyttsp_bus_ops {
> + s32 (*write)(void *handle, u8 addr, u8 length, const void
*values);
> + s32 (*read)(void *handle, u8 addr, u8 length, void *values);
> + s32 (*ext)(void *handle, void *values);
> + struct device *dev;
> +};
> +
> +void *cyttsp_core_init(struct cyttsp_bus_ops *bus_ops, struct device
> *dev);
> +
> +void cyttsp_core_release(void *handle);
> +#ifdef CONFIG_PM
> +int cyttsp_resume(void *handle);
> +int cyttsp_suspend(void *handle);
> +#endif
> +
> +#endif /* __CYTTSP_CORE_H__ */
> diff --git a/include/linux/input/cyttsp.h b/include/linux/input/cyttsp.h
> new file mode 100644
> index 0000000..c3959ce
> --- /dev/null
> +++ b/include/linux/input/cyttsp.h
> @@ -0,0 +1,68 @@
> +/*
> + * 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 Cypress Semiconductor, Inc.
> + *
> + * 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_ */
> --
> 1.7.2.1
>
>
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