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Date:	Mon, 10 Nov 2014 11:05:25 +0000
From:	Dudley Du <dudl@...ress.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Dudley Du <dudley.dulixin@...il.com>
CC:	"rydberg@...omail.se" <rydberg@...omail.se>,
	"bleung@...gle.com" <bleung@...gle.com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v9 03/18] input: cyapa: add gen3 trackpad device basic
 functions support

Thanks, Dmitry

> -----Original Message-----
> From: Dmitry Torokhov [mailto:dmitry.torokhov@...il.com]
> Sent: 2014?11?10? 16:30
> To: Dudley Du
> Cc: rydberg@...omail.se; Dudley Du; bleung@...gle.com;
> linux-input@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v9 03/18] input: cyapa: add gen3 trackpad device basic
> functions support
>
> On Mon, Nov 03, 2014 at 04:32:55PM +0800, Dudley Du wrote:
> > Based on the cyapa core, add the gen3 trackpad device's basic functions
> > supported, so gen3 trackpad device can work with kernel input system.
> > The basic function is absolutely same as previous cyapa driver.
> > TEST=test on Chromebooks.
> >
> > Signed-off-by: Dudley Du <dudl@...ress.com>
> > ---
> >  drivers/input/mouse/Makefile     |   3 +-
> >  drivers/input/mouse/cyapa.c      |  90 ++++-
> >  drivers/input/mouse/cyapa.h      |   1 +
> >  drivers/input/mouse/cyapa_gen3.c | 788
> +++++++++++++++++++++++++++++++++++++++
> >  4 files changed, 880 insertions(+), 2 deletions(-)
> >  create mode 100644 drivers/input/mouse/cyapa_gen3.c
> >
> > diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
> > index dda507f..4bf6c83 100644
> > --- a/drivers/input/mouse/Makefile
> > +++ b/drivers/input/mouse/Makefile
> > @@ -8,7 +8,7 @@ obj-$(CONFIG_MOUSE_AMIGA)+= amimouse.o
> >  obj-$(CONFIG_MOUSE_APPLETOUCH)+= appletouch.o
> >  obj-$(CONFIG_MOUSE_ATARI)+= atarimouse.o
> >  obj-$(CONFIG_MOUSE_BCM5974)+= bcm5974.o
> > -obj-$(CONFIG_MOUSE_CYAPA)+= cyapa.o
> > +obj-$(CONFIG_MOUSE_CYAPA)+= cyapatp.o
> >  obj-$(CONFIG_MOUSE_GPIO)+= gpio_mouse.o
> >  obj-$(CONFIG_MOUSE_INPORT)+= inport.o
> >  obj-$(CONFIG_MOUSE_LOGIBM)+= logibm.o
> > @@ -23,6 +23,7 @@ obj-$(CONFIG_MOUSE_SYNAPTICS_I2C)+= synaptics_i2c.o
> >  obj-$(CONFIG_MOUSE_SYNAPTICS_USB)+= synaptics_usb.o
> >  obj-$(CONFIG_MOUSE_VSXXXAA)+= vsxxxaa.o
> >
> > +cyapatp-objs := cyapa.o cyapa_gen3.o
> >  psmouse-objs := psmouse-base.o synaptics.o focaltech.o
> >
> >  psmouse-$(CONFIG_MOUSE_PS2_ALPS)+= alps.o
> > diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
> > index 5029618..cb81baf 100644
> > --- a/drivers/input/mouse/cyapa.c
> > +++ b/drivers/input/mouse/cyapa.c
> > @@ -234,6 +234,9 @@ static int cyapa_check_is_operational(struct cyapa
> *cyapa)
> >  return ret;
> >
> >  switch (cyapa->gen) {
> > +case CYAPA_GEN3:
> > +cyapa->ops = &cyapa_gen3_ops;
> > +break;
> >  default:
> >  return -ENODEV;
> >  }
> > @@ -284,7 +287,85 @@ out:
> >   */
> >  static int cyapa_get_state(struct cyapa *cyapa)
> >  {
> > -return -ENODEV;
> > +int ret;
> > +u8 status[BL_STATUS_SIZE];
> > +u8 cmd[32];
> > +/* The i2c address of gen4 and gen5 trackpad device must be even. */
> > +bool even_addr = ((cyapa->client->addr & 0x0001) == 0);
> > +bool smbus = false;
> > +int retries = 2;
> > +
> > +cyapa->state = CYAPA_STATE_NO_DEVICE;
> > +
> > +/*
> > + * Get trackpad status by reading 3 registers starting from 0.
> > + * If the device is in the bootloader, this will be BL_HEAD.
> > + * If the device is in operation mode, this will be the DATA regs.
> > + *
> > + */
> > +ret = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET, BL_STATUS_SIZE,
> > +       status);
> > +
> > +/*
> > + * On smbus systems in OP mode, the i2c_reg_read will fail with
> > + * -ETIMEDOUT.  In this case, try again using the smbus equivalent
> > + * command.  This should return a BL_HEAD indicating CYAPA_STATE_OP.
> > + */
> > +if (cyapa->smbus && (ret == -ETIMEDOUT || ret == -ENXIO)) {
> > +if (!even_addr)
> > +ret = cyapa_read_block(cyapa,
> > +CYAPA_CMD_BL_STATUS, status);
> > +smbus = true;
> > +}
> > +if (ret != BL_STATUS_SIZE)
> > +goto error;
> > +
> > +/*
> > + * Detect trackpad protocol based on characristic registers and bits.
> > + */
> > +do {
> > +cyapa->status[REG_OP_STATUS] = status[REG_OP_STATUS];
> > +cyapa->status[REG_BL_STATUS] = status[REG_BL_STATUS];
> > +cyapa->status[REG_BL_ERROR] = status[REG_BL_ERROR];
> > +
> > +if (cyapa->gen == CYAPA_GEN_UNKNOWN ||
> > +cyapa->gen == CYAPA_GEN3) {
> > +ret = cyapa_gen3_ops.state_parse(cyapa,
> > +status, BL_STATUS_SIZE);
> > +if (ret == 0)
> > +goto out_detected;
> > +}
> > +
> > +/*
> > + * Cannot detect communication protocol based on current
> > + * charateristic registers and bits.
> > + * So write error command to do further detection.
> > + * this method only valid on I2C bus.
> > + * for smbus interface, it won't have overwrite issue.
> > + */
>
> I do not quite understand this, can you re-phrase?

Sorry for the confusion, I means write the command to deivce to reset its status,
so we can try again to detect it correctly.
I would like change the comments to:
/*
 * Write 0x00 0x00 to attached trackpad device to force it update its status registers,
 * so later, can do the detection again.
 */

>
> > +if (!smbus) {
> > +cmd[0] = 0x00;
> > +cmd[1] = 0x00;
> > +ret = cyapa_i2c_write(cyapa, 0, 2, cmd);
> > +if (ret)
> > +goto error;
> > +
> > +msleep(50);
> > +
> > +ret = cyapa_i2c_read(cyapa, BL_HEAD_OFFSET,
> > +BL_STATUS_SIZE, status);
> > +if (ret < 0)
> > +goto error;
> > +}
> > +} while (--retries > 0 && !smbus);
> > +
> > +goto error;
> > +
> > +out_detected:
> > +return 0;
> > +
> > +error:
> > +return (ret < 0) ? ret : -EAGAIN;
> >  }
> >
> >  /*
> > @@ -421,6 +502,8 @@ u16 cyapa_pwr_cmd_to_sleep_time(u8 pwr_mode)
> >   */
> >  static int cyapa_initialize(struct cyapa *cyapa)
> >  {
> > +int ret = 0;
> > +
> >  cyapa->state = CYAPA_STATE_NO_DEVICE;
> >  cyapa->gen = CYAPA_GEN_UNKNOWN;
> >  mutex_init(&cyapa->state_sync_lock);
> > @@ -433,6 +516,11 @@ static int cyapa_initialize(struct cyapa *cyapa)
> >  cyapa->suspend_sleep_time =
> >  cyapa_pwr_cmd_to_sleep_time(cyapa->suspend_power_mode);
> >
> > +if (cyapa_gen3_ops.initialize)
> > +ret = cyapa_gen3_ops.initialize(cyapa);
> > +if (ret)
> > +return ret;
> > +
> >  return cyapa_detect(cyapa);
> >  }
> >
> > diff --git a/drivers/input/mouse/cyapa.h b/drivers/input/mouse/cyapa.h
> > index ee97d7c..b281dcb 100644
> > --- a/drivers/input/mouse/cyapa.h
> > +++ b/drivers/input/mouse/cyapa.h
> > @@ -317,5 +317,6 @@ u16 cyapa_pwr_cmd_to_sleep_time(u8 pwr_mode);
> >
> >
> >  extern const char unique_str[];
> > +extern const struct cyapa_dev_ops cyapa_gen3_ops;
> >
> >  #endif
> > diff --git a/drivers/input/mouse/cyapa_gen3.c
> b/drivers/input/mouse/cyapa_gen3.c
> > new file mode 100644
> > index 0000000..bd00c6e
> > --- /dev/null
> > +++ b/drivers/input/mouse/cyapa_gen3.c
> > @@ -0,0 +1,788 @@
> > +/*
> > + * Cypress APA trackpad with I2C interface
> > + *
> > + * Author: Dudley Du <dudl@...ress.com>
> > + * Further cleanup and restructuring by:
> > + *   Daniel Kurtz <djkurtz@...omium.org>
> > + *   Benson Leung <bleung@...omium.org>
> > + *
> > + * Copyright (C) 2011-2014 Cypress Semiconductor, Inc.
> > + * Copyright (C) 2011-2012 Google, Inc.
> > + *
> > + * This file is subject to the terms and conditions of the GNU General Public
> > + * License.  See the file COPYING in the main directory of this archive for
> > + * more details.
> > + */
> > +
> > +#include <linux/delay.h>
> > +#include <linux/i2c.h>
> > +#include <linux/input.h>
> > +#include <linux/input/mt.h>
> > +#include <linux/module.h>
> > +#include <linux/slab.h>
> > +#include "cyapa.h"
> > +
> > +
> > +#define GEN3_MAX_FINGERS 5
> > +#define GEN3_FINGER_NUM(x) (((x) >> 4) & 0x07)
> > +
> > +#define BLK_HEAD_BYTES 32
> > +
> > +/* Macro for register map group offset. */
> > +#define PRODUCT_ID_SIZE  16
> > +#define QUERY_DATA_SIZE  27
> > +#define REG_PROTOCOL_GEN_QUERY_OFFSET  20
> > +
> > +#define REG_OFFSET_DATA_BASE     0x0000
> > +#define REG_OFFSET_COMMAND_BASE  0x0028
> > +#define REG_OFFSET_QUERY_BASE    0x002a
> > +
> > +#define CYAPA_OFFSET_SOFT_RESET  REG_OFFSET_COMMAND_BASE
> > +#define OP_RECALIBRATION_MASK    0x80
> > +#define OP_REPORT_BASELINE_MASK  0x40
> > +#define REG_OFFSET_MAX_BASELINE  0x0026
> > +#define REG_OFFSET_MIN_BASELINE  0x0027
> > +
> > +#define REG_OFFSET_POWER_MODE (REG_OFFSET_COMMAND_BASE + 1)
> > +#define SET_POWER_MODE_DELAY   10000  /* unit: us */
> > +#define SET_POWER_MODE_TRIES   5
> > +
> > +/*
> > + * CYAPA trackpad device states.
> > + * Used in register 0x00, bit1-0, DeviceStatus field.
> > + * Other values indicate device is in an abnormal state and must be reset.
> > + */
> > +#define CYAPA_DEV_NORMAL  0x03
> > +#define CYAPA_DEV_BUSY    0x01
> > +
> > +#define CYAPA_FW_BLOCK_SIZE64
> > +#define CYAPA_FW_READ_SIZE16
> > +#define CYAPA_FW_HDR_START0x0780
> > +#define CYAPA_FW_HDR_BLOCK_COUNT  2
> > +#define CYAPA_FW_HDR_BLOCK_START  (CYAPA_FW_HDR_START /
> CYAPA_FW_BLOCK_SIZE)
> > +#define CYAPA_FW_HDR_SIZE  (CYAPA_FW_HDR_BLOCK_COUNT * \
> > +CYAPA_FW_BLOCK_SIZE)
> > +#define CYAPA_FW_DATA_START0x0800
> > +#define CYAPA_FW_DATA_BLOCK_COUNT  480
> > +#define CYAPA_FW_DATA_BLOCK_START  (CYAPA_FW_DATA_START /
> CYAPA_FW_BLOCK_SIZE)
> > +#define CYAPA_FW_DATA_SIZE(CYAPA_FW_DATA_BLOCK_COUNT * \
> > + CYAPA_FW_BLOCK_SIZE)
> > +#define CYAPA_FW_SIZE(CYAPA_FW_HDR_SIZE + CYAPA_FW_DATA_SIZE)
> > +#define CYAPA_CMD_LEN16
> > +
> > +#define GEN3_BL_IDLE_FW_MAJ_VER_OFFSET 0x0b
> > +#define GEN3_BL_IDLE_FW_MIN_VER_OFFSET
> (GEN3_BL_IDLE_FW_MAJ_VER_OFFSET + 1)
> > +
> > +
> > +struct cyapa_touch {
> > +/*
> > + * high bits or x/y position value
> > + * bit 7 - 4: high 4 bits of x position value
> > + * bit 3 - 0: high 4 bits of y position value
> > + */
> > +u8 xy_hi;
> > +u8 x_lo;  /* low 8 bits of x position value. */
> > +u8 y_lo;  /* low 8 bits of y position value. */
> > +u8 pressure;
> > +/* id range is 1 - 15.  It is incremented with every new touch. */
> > +u8 id;
> > +} __packed;
> > +
> > +struct cyapa_reg_data {
> > +/*
> > + * bit 0 - 1: device status
> > + * bit 3 - 2: power mode
> > + * bit 6 - 4: reserved
> > + * bit 7: interrupt valid bit
> > + */
> > +u8 device_status;
> > +/*
> > + * bit 7 - 4: number of fingers currently touching pad
> > + * bit 3: valid data check bit
> > + * bit 2: middle mechanism button state if exists
> > + * bit 1: right mechanism button state if exists
> > + * bit 0: left mechanism button state if exists
> > + */
> > +u8 finger_btn;
> > +/* CYAPA reports up to 5 touches per packet. */
> > +struct cyapa_touch touches[5];
> > +} __packed;
> > +
> > +static const u8 bl_activate[] = { 0x00, 0xff, 0x38, 0x00, 0x01, 0x02, 0x03,
> > +0x04, 0x05, 0x06, 0x07 };
> > +static const u8 bl_deactivate[] = { 0x00, 0xff, 0x3b, 0x00, 0x01, 0x02, 0x03,
> > +0x04, 0x05, 0x06, 0x07 };
> > +static const u8 bl_exit[] = { 0x00, 0xff, 0xa5, 0x00, 0x01, 0x02, 0x03, 0x04,
> > +0x05, 0x06, 0x07 };
> > +
> > +
> > + /* for byte read/write command */
> > +#define CMD_RESET      0
> > +#define CMD_POWER_MODE 1
> > +#define CMD_DEV_STATUS 2
> > +#define CMD_REPORT_MAX_BASELINE 3
> > +#define CMD_REPORT_MIN_BASELINE 4
> > +#define SMBUS_BYTE_CMD(cmd) (((cmd) & 0x3f) << 1)
> > +#define CYAPA_SMBUS_RESET         SMBUS_BYTE_CMD(CMD_RESET)
> > +#define CYAPA_SMBUS_POWER_MODE
> SMBUS_BYTE_CMD(CMD_POWER_MODE)
> > +#define CYAPA_SMBUS_DEV_STATUS
> SMBUS_BYTE_CMD(CMD_DEV_STATUS)
> > +#define CYAPA_SMBUS_MAX_BASELINE
> SMBUS_BYTE_CMD(CMD_REPORT_MAX_BASELINE)
> > +#define CYAPA_SMBUS_MIN_BASELINE
> SMBUS_BYTE_CMD(CMD_REPORT_MIN_BASELINE)
> > +
> > + /* for group registers read/write command */
> > +#define REG_GROUP_DATA 0
> > +#define REG_GROUP_CMD 2
> > +#define REG_GROUP_QUERY 3
> > +#define SMBUS_GROUP_CMD(grp) (0x80 | (((grp) & 0x07) << 3))
> > +#define CYAPA_SMBUS_GROUP_DATA
> SMBUS_GROUP_CMD(REG_GROUP_DATA)
> > +#define CYAPA_SMBUS_GROUP_CMD
> SMBUS_GROUP_CMD(REG_GROUP_CMD)
> > +#define CYAPA_SMBUS_GROUP_QUERY
> SMBUS_GROUP_CMD(REG_GROUP_QUERY)
> > +
> > + /* for register block read/write command */
> > +#define CMD_BL_STATUS 0
> > +#define CMD_BL_HEAD 1
> > +#define CMD_BL_CMD 2
> > +#define CMD_BL_DATA 3
> > +#define CMD_BL_ALL 4
> > +#define CMD_BLK_PRODUCT_ID 5
> > +#define CMD_BLK_HEAD 6
> > +#define SMBUS_BLOCK_CMD(cmd) (0xc0 | (((cmd) & 0x1f) << 1))
> > +
> > +/* register block read/write command in bootloader mode */
> > +#define CYAPA_SMBUS_BL_STATUS  SMBUS_BLOCK_CMD(CMD_BL_STATUS)
> > +#define CYAPA_SMBUS_BL_HEAD    SMBUS_BLOCK_CMD(CMD_BL_HEAD)
> > +#define CYAPA_SMBUS_BL_CMD     SMBUS_BLOCK_CMD(CMD_BL_CMD)
> > +#define CYAPA_SMBUS_BL_DATA    SMBUS_BLOCK_CMD(CMD_BL_DATA)
> > +#define CYAPA_SMBUS_BL_ALL     SMBUS_BLOCK_CMD(CMD_BL_ALL)
> > +
> > +/* register block read/write command in operational mode */
> > +#define CYAPA_SMBUS_BLK_PRODUCT_ID
> SMBUS_BLOCK_CMD(CMD_BLK_PRODUCT_ID)
> > +#define CYAPA_SMBUS_BLK_HEAD SMBUS_BLOCK_CMD(CMD_BLK_HEAD)
> > +
> > + /* for byte read/write command */
> > +#define CMD_RESET 0
> > +#define CMD_POWER_MODE 1
> > +#define CMD_DEV_STATUS 2
> > +#define CMD_REPORT_MAX_BASELINE 3
> > +#define CMD_REPORT_MIN_BASELINE 4
> > +#define SMBUS_BYTE_CMD(cmd) (((cmd) & 0x3f) << 1)
> > +#define CYAPA_SMBUS_RESET         SMBUS_BYTE_CMD(CMD_RESET)
> > +#define CYAPA_SMBUS_POWER_MODE
> SMBUS_BYTE_CMD(CMD_POWER_MODE)
> > +#define CYAPA_SMBUS_DEV_STATUS
> SMBUS_BYTE_CMD(CMD_DEV_STATUS)
> > +#define CYAPA_SMBUS_MAX_BASELINE
> SMBUS_BYTE_CMD(CMD_REPORT_MAX_BASELINE)
> > +#define CYAPA_SMBUS_MIN_BASELINE
> SMBUS_BYTE_CMD(CMD_REPORT_MIN_BASELINE)
> > +
> > + /* for group registers read/write command */
> > +#define REG_GROUP_DATA  0
> > +#define REG_GROUP_CMD   2
> > +#define REG_GROUP_QUERY 3
> > +#define SMBUS_GROUP_CMD(grp) (0x80 | (((grp) & 0x07) << 3))
> > +#define CYAPA_SMBUS_GROUP_DATA
> SMBUS_GROUP_CMD(REG_GROUP_DATA)
> > +#define CYAPA_SMBUS_GROUP_CMD
> SMBUS_GROUP_CMD(REG_GROUP_CMD)
> > +#define CYAPA_SMBUS_GROUP_QUERY
> SMBUS_GROUP_CMD(REG_GROUP_QUERY)
> > +
> > + /* for register block read/write command */
> > +#define CMD_BL_STATUS0
> > +#define CMD_BL_HEAD1
> > +#define CMD_BL_CMD2
> > +#define CMD_BL_DATA3
> > +#define CMD_BL_ALL4
> > +#define CMD_BLK_PRODUCT_ID5
> > +#define CMD_BLK_HEAD6
> > +#define SMBUS_BLOCK_CMD(cmd) (0xc0 | (((cmd) & 0x1f) << 1))
> > +
> > +/* register block read/write command in bootloader mode */
> > +#define CYAPA_SMBUS_BL_STATUS SMBUS_BLOCK_CMD(CMD_BL_STATUS)
> > +#define CYAPA_SMBUS_BL_HEAD   SMBUS_BLOCK_CMD(CMD_BL_HEAD)
> > +#define CYAPA_SMBUS_BL_CMD    SMBUS_BLOCK_CMD(CMD_BL_CMD)
> > +#define CYAPA_SMBUS_BL_DATA   SMBUS_BLOCK_CMD(CMD_BL_DATA)
> > +#define CYAPA_SMBUS_BL_ALL    SMBUS_BLOCK_CMD(CMD_BL_ALL)
> > +
> > +/* register block read/write command in operational mode */
> > +#define CYAPA_SMBUS_BLK_PRODUCT_ID
> SMBUS_BLOCK_CMD(CMD_BLK_PRODUCT_ID)
> > +#define CYAPA_SMBUS_BLK_HEAD
> SMBUS_BLOCK_CMD(CMD_BLK_HEAD)
> > +
> > +struct cyapa_cmd_len {
> > +u8 cmd;
> > +u8 len;
> > +};
> > +
> > +/* maps generic CYAPA_CMD_* code to the I2C equivalent */
> > +static const struct cyapa_cmd_len cyapa_i2c_cmds[] = {
> > +{ CYAPA_OFFSET_SOFT_RESET, 1 },/* CYAPA_CMD_SOFT_RESET */
> > +{ REG_OFFSET_COMMAND_BASE + 1, 1 },/* CYAPA_CMD_POWER_MODE
> */
> > +{ REG_OFFSET_DATA_BASE, 1 },/* CYAPA_CMD_DEV_STATUS */
> > +{ REG_OFFSET_DATA_BASE, sizeof(struct cyapa_reg_data) },
> > +/* CYAPA_CMD_GROUP_DATA */
> > +{ REG_OFFSET_COMMAND_BASE, 0 },/* CYAPA_CMD_GROUP_CMD */
> > +{ REG_OFFSET_QUERY_BASE, QUERY_DATA_SIZE }, /*
> CYAPA_CMD_GROUP_QUERY */
> > +{ BL_HEAD_OFFSET, 3 },/* CYAPA_CMD_BL_STATUS */
> > +{ BL_HEAD_OFFSET, 16 },/* CYAPA_CMD_BL_HEAD */
> > +{ BL_HEAD_OFFSET, 16 },/* CYAPA_CMD_BL_CMD */
> > +{ BL_DATA_OFFSET, 16 },/* CYAPA_CMD_BL_DATA */
> > +{ BL_HEAD_OFFSET, 32 },/* CYAPA_CMD_BL_ALL */
> > +{ REG_OFFSET_QUERY_BASE, PRODUCT_ID_SIZE },
> > +/* CYAPA_CMD_BLK_PRODUCT_ID */
> > +{ REG_OFFSET_DATA_BASE, 32 },/* CYAPA_CMD_BLK_HEAD */
> > +{ REG_OFFSET_MAX_BASELINE, 1 },/* CYAPA_CMD_MAX_BASELINE
> */
> > +{ REG_OFFSET_MIN_BASELINE, 1 },/* CYAPA_CMD_MIN_BASELINE
> */
> > +};
> > +
> > +static const struct cyapa_cmd_len cyapa_smbus_cmds[] = {
> > +{ CYAPA_SMBUS_RESET, 1 },/* CYAPA_CMD_SOFT_RESET */
> > +{ CYAPA_SMBUS_POWER_MODE, 1 },/* CYAPA_CMD_POWER_MODE
> */
> > +{ CYAPA_SMBUS_DEV_STATUS, 1 },/* CYAPA_CMD_DEV_STATUS */
> > +{ CYAPA_SMBUS_GROUP_DATA, sizeof(struct cyapa_reg_data) },
> > +/* CYAPA_CMD_GROUP_DATA */
> > +{ CYAPA_SMBUS_GROUP_CMD, 2 },/* CYAPA_CMD_GROUP_CMD */
> > +{ CYAPA_SMBUS_GROUP_QUERY, QUERY_DATA_SIZE },
> > +/* CYAPA_CMD_GROUP_QUERY */
> > +{ CYAPA_SMBUS_BL_STATUS, 3 },/* CYAPA_CMD_BL_STATUS */
> > +{ CYAPA_SMBUS_BL_HEAD, 16 },/* CYAPA_CMD_BL_HEAD */
> > +{ CYAPA_SMBUS_BL_CMD, 16 },/* CYAPA_CMD_BL_CMD */
> > +{ CYAPA_SMBUS_BL_DATA, 16 },/* CYAPA_CMD_BL_DATA */
> > +{ CYAPA_SMBUS_BL_ALL, 32 },/* CYAPA_CMD_BL_ALL */
> > +{ CYAPA_SMBUS_BLK_PRODUCT_ID, PRODUCT_ID_SIZE },
> > +/* CYAPA_CMD_BLK_PRODUCT_ID */
> > +{ CYAPA_SMBUS_BLK_HEAD, 16 },/* CYAPA_CMD_BLK_HEAD */
> > +{ CYAPA_SMBUS_MAX_BASELINE, 1 },/* CYAPA_CMD_MAX_BASELINE */
> > +{ CYAPA_SMBUS_MIN_BASELINE, 1 },/* CYAPA_CMD_MIN_BASELINE */
> > +};
> > +
> > +static bool data_reporting_started;
>
> Why is this a global?

Thanks, it should not be global, I will fix it and included in the gen3 private data.

>
> > +
> > +
> > +/*
> > + * cyapa_smbus_read_block - perform smbus block read command
> > + * @cyapa  - private data structure of the driver
> > + * @cmd    - the properly encoded smbus command
> > + * @len    - expected length of smbus command result
> > + * @values - buffer to store smbus command result
> > + *
> > + * Returns negative errno, else the number of bytes written.
> > + *
> > + * Note:
> > + * In trackpad device, the memory block allocated for I2C register map
> > + * is 256 bytes, so the max read block for I2C bus is 256 bytes.
> > + */
> > +ssize_t cyapa_smbus_read_block(struct cyapa *cyapa, u8 cmd, size_t len,
> > +      u8 *values)
> > +{
> > +ssize_t ret;
> > +u8 index;
> > +u8 smbus_cmd;
> > +u8 *buf;
> > +struct i2c_client *client = cyapa->client;
> > +
> > +if (!(SMBUS_BYTE_BLOCK_CMD_MASK & cmd))
> > +return -EINVAL;
> > +
> > +if (SMBUS_GROUP_BLOCK_CMD_MASK & cmd) {
> > +/* read specific block registers command. */
> > +smbus_cmd = SMBUS_ENCODE_RW(cmd, SMBUS_READ);
> > +ret = i2c_smbus_read_block_data(client, smbus_cmd, values);
> > +goto out;
> > +}
> > +
> > +ret = 0;
> > +for (index = 0; index * I2C_SMBUS_BLOCK_MAX < len; index++) {
> > +smbus_cmd = SMBUS_ENCODE_IDX(cmd, index);
> > +smbus_cmd = SMBUS_ENCODE_RW(smbus_cmd, SMBUS_READ);
> > +buf = values + I2C_SMBUS_BLOCK_MAX * index;
> > +ret = i2c_smbus_read_block_data(client, smbus_cmd, buf);
> > +if (ret < 0)
> > +goto out;
> > +}
> > +
> > +out:
> > +return ret > 0 ? len : ret;
> > +}
> > +
> > +s32 cyapa_read_byte(struct cyapa *cyapa, u8 cmd_idx)
> > +{
> > +u8 cmd;
> > +
> > +if (cyapa->smbus) {
> > +cmd = cyapa_smbus_cmds[cmd_idx].cmd;
> > +cmd = SMBUS_ENCODE_RW(cmd, SMBUS_READ);
> > +} else {
> > +cmd = cyapa_i2c_cmds[cmd_idx].cmd;
> > +}
> > +return i2c_smbus_read_byte_data(cyapa->client, cmd);
> > +}
> > +
> > +s32 cyapa_write_byte(struct cyapa *cyapa, u8 cmd_idx, u8 value)
> > +{
> > +u8 cmd;
> > +
> > +if (cyapa->smbus) {
> > +cmd = cyapa_smbus_cmds[cmd_idx].cmd;
> > +cmd = SMBUS_ENCODE_RW(cmd, SMBUS_WRITE);
> > +} else {
> > +cmd = cyapa_i2c_cmds[cmd_idx].cmd;
> > +}
> > +return i2c_smbus_write_byte_data(cyapa->client, cmd, value);
> > +}
> > +
> > +ssize_t cyapa_read_block(struct cyapa *cyapa, u8 cmd_idx, u8 *values)
> > +{
> > +u8 cmd;
> > +size_t len;
> > +
> > +if (cyapa->smbus) {
> > +cmd = cyapa_smbus_cmds[cmd_idx].cmd;
> > +len = cyapa_smbus_cmds[cmd_idx].len;
> > +return cyapa_smbus_read_block(cyapa, cmd, len, values);
> > +}
> > +cmd = cyapa_i2c_cmds[cmd_idx].cmd;
> > +len = cyapa_i2c_cmds[cmd_idx].len;
> > +return cyapa_i2c_reg_read_block(cyapa, cmd, len, values);
> > +}
> > +
> > +/*
> > + * Determine the Gen3 trackpad device's current operating state.
> > + *
> > + */
> > +static int cyapa_gen3_state_parse(struct cyapa *cyapa, u8 *reg_data, int len)
> > +{
> > +/*
> > + * Must be in detecting and should not do data reporting.
> > + * It will be reenabled when all detecting done and lauched into
> > + * applicaiton mode successfully.
> > + */
> > +data_reporting_started = false;
> > +cyapa->state = CYAPA_STATE_NO_DEVICE;
> > +
> > +/* Parse based on Gen3 characteristic registers and bits */
> > +if (reg_data[REG_BL_FILE] == BL_FILE &&
> > +reg_data[REG_BL_ERROR] == BL_ERROR_NO_ERR_IDLE &&
> > +(reg_data[REG_BL_STATUS] ==
> > +(BL_STATUS_RUNNING | BL_STATUS_CSUM_VALID) ||
> > +reg_data[REG_BL_STATUS] == BL_STATUS_RUNNING)) {
> > +/*
> > + * Normal state after power on or reset,
> > + * REG_BL_STATUS == 0x11, firmware image checksum is valid.
> > + * REG_BL_STATUS == 0x10, firmware image checksum is invalid.
> > + */
> > +cyapa->gen = CYAPA_GEN3;
> > +cyapa->state = CYAPA_STATE_BL_IDLE;
> > +} else if (reg_data[REG_BL_FILE] == BL_FILE &&
> > +(reg_data[REG_BL_STATUS] & BL_STATUS_RUNNING) ==
> > +BL_STATUS_RUNNING) {
> > +cyapa->gen = CYAPA_GEN3;
> > +if (reg_data[REG_BL_STATUS] & BL_STATUS_BUSY) {
> > +cyapa->state = CYAPA_STATE_BL_BUSY;
> > +} else {
> > +if ((reg_data[REG_BL_ERROR] & BL_ERROR_BOOTLOADING) ==
> > +BL_ERROR_BOOTLOADING)
> > +cyapa->state = CYAPA_STATE_BL_ACTIVE;
> > +else
> > +cyapa->state = CYAPA_STATE_BL_IDLE;
> > +}
> > +} else if ((reg_data[REG_OP_STATUS] & OP_STATUS_SRC) &&
> > +(reg_data[REG_OP_DATA1] & OP_DATA_VALID)) {
> > +/*
> > + * Normal state when running in operaitonal mode,
> > + * may also not in full power state or
> > + * busying in command process.
> > + */
> > +if (GEN3_FINGER_NUM(reg_data[REG_OP_DATA1]) <=
> > +GEN3_MAX_FINGERS) {
> > +/* Finger number data is valid. */
> > +cyapa->gen = CYAPA_GEN3;
> > +cyapa->state = CYAPA_STATE_OP;
> > +}
> > +} else if (reg_data[REG_OP_STATUS] == 0x0C &&
> > +reg_data[REG_OP_DATA1] == 0x08) {
> > +/* Op state when first two registers overwritten with 0x00 */
> > +cyapa->gen = CYAPA_GEN3;
> > +cyapa->state = CYAPA_STATE_OP;
> > +} else if (reg_data[REG_BL_STATUS] &
> > +(BL_STATUS_RUNNING | BL_STATUS_BUSY)) {
> > +cyapa->gen = CYAPA_GEN3;
> > +cyapa->state = CYAPA_STATE_BL_BUSY;
> > +}
> > +
> > +if (cyapa->gen == CYAPA_GEN3 && (cyapa->state == CYAPA_STATE_OP ||
> > +cyapa->state == CYAPA_STATE_BL_IDLE ||
> > +cyapa->state == CYAPA_STATE_BL_ACTIVE ||
> > +cyapa->state == CYAPA_STATE_BL_BUSY))
> > +return 0;
> > +
> > +return -EAGAIN;
> > +}
> > +
> > +static int cyapa_gen3_bl_deactivate(struct cyapa *cyapa)
> > +{
> > +int ret;
> > +
> > +ret = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_deactivate),
> > +bl_deactivate);
> > +if (ret < 0)
> > +return ret;
> > +
> > +/* Wait for bootloader to switch to idle state; should take < 100ms */
> > +msleep(100);
> > +ret = cyapa_poll_state(cyapa, 500);
> > +if (ret < 0)
> > +return ret;
> > +if (cyapa->state != CYAPA_STATE_BL_IDLE)
> > +return -EAGAIN;
> > +return 0;
> > +}
> > +
> > +/*
> > + * Exit bootloader
> > + *
> > + * Send bl_exit command, then wait 50 - 100 ms to let device transition to
> > + * operational mode.  If this is the first time the device's firmware is
> > + * running, it can take up to 2 seconds to calibrate its sensors.  So, poll
> > + * the device's new state for up to 2 seconds.
> > + *
> > + * Returns:
> > + *   -EIO    failure while reading from device
> > + *   -EAGAIN device is stuck in bootloader, b/c it has invalid firmware
> > + *   0       device is supported and in operational mode
> > + */
> > +static int cyapa_gen3_bl_exit(struct cyapa *cyapa)
> > +{
> > +int ret;
> > +
> > +ret = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_exit), bl_exit);
> > +if (ret < 0)
> > +return ret;
> > +
> > +/*
> > + * Wait for bootloader to exit, and operation mode to start.
> > + * Normally, this takes at least 50 ms.
> > + */
> > +usleep_range(50000, 100000);
> > +/*
> > + * In addition, when a device boots for the first time after being
> > + * updated to new firmware, it must first calibrate its sensors, which
> > + * can take up to an additional 2 seconds. If the device power is
> > + * running low, this may take even longer.
> > + */
> > +ret = cyapa_poll_state(cyapa, 4000);
> > +if (ret < 0)
> > +return ret;
> > +if (cyapa->state != CYAPA_STATE_OP)
> > +return -EAGAIN;
> > +
> > +return 0;
> > +}
> > +
> > +/*
> > + * cyapa_get_wait_time_for_pwr_cmd
> > + *
> > + * Compute the amount of time we need to wait after updating the touchpad
> > + * power mode. The touchpad needs to consume the incoming power mode set
> > + * command at the current clock rate.
> > + */
> > +
> > +static u16 cyapa_get_wait_time_for_pwr_cmd(u8 pwr_mode)
> > +{
> > +switch (pwr_mode) {
> > +case PWR_MODE_FULL_ACTIVE: return 20;
> > +case PWR_MODE_BTN_ONLY: return 20;
> > +case PWR_MODE_OFF: return 20;
> > +default: return cyapa_pwr_cmd_to_sleep_time(pwr_mode) + 50;
> > +}
> > +}
> > +
> > +/*
> > + * Set device power mode
> > + *
> > + * Write to the field to configure power state. Power states include :
> > + *   Full : Max scans and report rate.
> > + *   Idle : Report rate set by user specified time.
> > + *   ButtonOnly : No scans for fingers. When the button is triggered,
> > + *     a slave interrupt is asserted to notify host to wake up.
> > + *   Off : Only awake for i2c commands from host. No function for button
> > + *     or touch sensors.
> > + *
> > + * The power_mode command should conform to the following :
> > + *   Full : 0x3f
> > + *   Idle : Configurable from 20 to 1000ms. See note below for
> > + *     cyapa_sleep_time_to_pwr_cmd and cyapa_pwr_cmd_to_sleep_time
> > + *   ButtonOnly : 0x01
> > + *   Off : 0x00
> > + *
> > + * Device power mode can only be set when device is in operational mode.
> > + */
> > +static int cyapa_gen3_set_power_mode(struct cyapa *cyapa, u8 power_mode,
> > +u16 always_unused)
> > +{
> > +int ret;
> > +u8 power;
> > +int tries = SET_POWER_MODE_TRIES;
> > +u16 sleep_time;
> > +
> > +always_unused = 0;
> > +if (cyapa->state != CYAPA_STATE_OP)
> > +return 0;
> > +
> > +while (true) {
> > +ret = cyapa_read_byte(cyapa, CYAPA_CMD_POWER_MODE);
> > +if (ret >= 0 || --tries < 1)
> > +break;
> > +usleep_range(SET_POWER_MODE_DELAY, 2 *
> SET_POWER_MODE_DELAY);
> > +}
> > +if (ret < 0)
> > +return ret;
> > +
> > +/*
> > + * Return early if the power mode to set is the same as the current
> > + * one.
> > + */
> > +if ((ret & PWR_MODE_MASK) == power_mode)
> > +return 0;
> > +
> > +sleep_time = cyapa_get_wait_time_for_pwr_cmd(ret & PWR_MODE_MASK);
> > +power = ret;
> > +power &= ~PWR_MODE_MASK;
> > +power |= power_mode & PWR_MODE_MASK;
> > +while (true) {
> > +ret = cyapa_write_byte(cyapa, CYAPA_CMD_POWER_MODE, power);
> > +if (!ret || --tries < 1)
> > +break;
> > +usleep_range(SET_POWER_MODE_DELAY, 2 *
> SET_POWER_MODE_DELAY);
> > +}
> > +
> > +/*
> > + * Wait for the newly set power command to go in at the previous
> > + * clock speed (scanrate) used by the touchpad firmware. Not
> > + * doing so before issuing the next command may result in errors
> > + * depending on the command's content.
> > + */
> > +msleep(sleep_time);
> > +return ret;
> > +}
> > +
> > +static int cyapa_gen3_get_query_data(struct cyapa *cyapa)
> > +{
> > +u8 query_data[QUERY_DATA_SIZE];
> > +int ret;
> > +
> > +if (cyapa->state != CYAPA_STATE_OP)
> > +return -EBUSY;
> > +
> > +ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_QUERY, query_data);
> > +if (ret != QUERY_DATA_SIZE)
> > +return (ret < 0) ? ret : -EIO;
> > +
> > +memcpy(&cyapa->product_id[0], &query_data[0], 5);
> > +cyapa->product_id[5] = '-';
> > +memcpy(&cyapa->product_id[6], &query_data[5], 6);
> > +cyapa->product_id[12] = '-';
> > +memcpy(&cyapa->product_id[13], &query_data[11], 2);
> > +cyapa->product_id[15] = '\0';
> > +
> > +cyapa->fw_maj_ver = query_data[15];
> > +cyapa->fw_min_ver = query_data[16];
> > +
> > +cyapa->btn_capability = query_data[19] & CAPABILITY_BTN_MASK;
> > +
> > +cyapa->gen = query_data[20] & 0x0f;
> > +
> > +cyapa->max_abs_x = ((query_data[21] & 0xf0) << 4) | query_data[22];
> > +cyapa->max_abs_y = ((query_data[21] & 0x0f) << 8) | query_data[23];
> > +
> > +cyapa->physical_size_x =
> > +((query_data[24] & 0xf0) << 4) | query_data[25];
> > +cyapa->physical_size_y =
> > +((query_data[24] & 0x0f) << 8) | query_data[26];
> > +
> > +cyapa->max_z = 255;
> > +
> > +return 0;
> > +}
> > +
> > +static int cyapa_gen3_bl_query_data(struct cyapa *cyapa)
> > +{
> > +u8 bl_data[CYAPA_CMD_LEN];
> > +int ret;
> > +
> > +ret = cyapa_i2c_reg_read_block(cyapa, 0, CYAPA_CMD_LEN, bl_data);
> > +if (ret != CYAPA_CMD_LEN)
> > +return (ret < 0) ? ret : -EIO;
> > +
> > +/*
> > + * This value will be updated again when entered application mode.
> > + * If TP failed to enter application mode, this fw version values
> > + * can be used as a reference.
> > + * This firmware version valid when fw image checksum is valid.
> > + */
> > +if (bl_data[REG_BL_STATUS] ==
> > +(BL_STATUS_RUNNING | BL_STATUS_CSUM_VALID)) {
> > +cyapa->fw_maj_ver = bl_data[GEN3_BL_IDLE_FW_MAJ_VER_OFFSET];
> > +cyapa->fw_min_ver = bl_data[GEN3_BL_IDLE_FW_MIN_VER_OFFSET];
> > +}
> > +
> > +return 0;
> > +}
> > +
> > +/*
> > + * Check if device is operational.
> > + *
> > + * An operational device is responding, has exited bootloader, and has
> > + * firmware supported by this driver.
> > + *
> > + * Returns:
> > + *   -EBUSY  no device or in bootloader
> > + *   -EIO    failure while reading from device
> > + *   -EAGAIN device is still in bootloader
> > + *           if ->state = CYAPA_STATE_BL_IDLE, device has invalid firmware
> > + *   -EINVAL device is in operational mode, but not supported by this driver
> > + *   0       device is supported
> > + */
> > +static int cyapa_gen3_do_operational_check(struct cyapa *cyapa)
> > +{
> > +struct device *dev = &cyapa->client->dev;
> > +int ret;
> > +
> > +switch (cyapa->state) {
> > +case CYAPA_STATE_BL_ACTIVE:
> > +ret = cyapa_gen3_bl_deactivate(cyapa);
> > +if (ret) {
> > +dev_err(dev, "failed to bl_deactivate. %d\n", ret);
> > +return ret;
> > +}
> > +
> > +/* Fallthrough state */
> > +case CYAPA_STATE_BL_IDLE:
> > +/* Try to get firmware version in bootloader mode. */
> > +cyapa_gen3_bl_query_data(cyapa);
> > +
> > +ret = cyapa_gen3_bl_exit(cyapa);
> > +if (ret) {
> > +dev_err(dev, "failed to bl_exit. %d\n", ret);
> > +return ret;
> > +}
> > +
> > +/* Fallthrough state */
> > +case CYAPA_STATE_OP:
> > +/*
> > + * Reading query data before going back to the full mode
> > + * may cause problems, so we set the power mode first here.
> > + */
> > +ret = cyapa_gen3_set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE,
> 0);
> > +if (ret)
> > +dev_err(dev, "%s: set full power mode failed, (%d)\n",
> > +__func__, ret);
> > +ret = cyapa_gen3_get_query_data(cyapa);
> > +if (ret < 0)
> > +return ret;
> > +
> > +/* Only support firmware protocol gen3 */
> > +if (cyapa->gen != CYAPA_GEN3) {
> > +dev_err(dev, "unsupported protocol version (%d)",
> > +cyapa->gen);
> > +return -EINVAL;
> > +}
> > +
> > +/* Only support product ID starting with CYTRA */
> > +if (memcmp(cyapa->product_id, unique_str,
> > +strlen(unique_str)) != 0) {
> > +dev_err(dev, "unsupported product ID (%s)\n",
> > +cyapa->product_id);
> > +return -EINVAL;
> > +}
> > +
> > +data_reporting_started = true;
> > +return 0;
> > +
> > +default:
> > +return -EIO;
> > +}
> > +return 0;
> > +}
> > +
> > +/*
> > + * Return false, do not continue process
> > + * Return true, continue process.
> > + */
> > +static bool cyapa_gen3_irq_cmd_handler(struct cyapa *cyapa)
> > +{
> > +/* Not gen3 irq command response, skip for continue. */
> > +if (cyapa->gen != CYAPA_GEN3)
> > +return true;
> > +
> > +if (cyapa->input && data_reporting_started)
> > +return true;
> > +
> > +/*
> > + * Driver in detecting or other interface function processing,
> > + * so, stop cyapa_gen3_irq_handler to continue process to
> > + * avoid unwanted to error detecting and processing.
> > + *
> > + * And also, avoid the periodicly accerted interrupts to be processed
> > + * as touch inputs when gen3 failed to launch into application mode,
> > + * which will cause gen3 stays in bootloader mode.
> > + */
> > +return false;
> > +}
> > +
> > +static int cyapa_gen3_irq_handler(struct cyapa *cyapa)
> > +{
> > +struct input_dev *input = cyapa->input;
> > +struct device *dev = &cyapa->client->dev;
> > +struct cyapa_reg_data data;
> > +int i;
> > +int ret;
> > +int num_fingers;
> > +
> > +ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_DATA, (u8 *)&data);
> > +if (ret != sizeof(data)) {
> > +dev_err(dev, "failed to read report data, (%d)\n", ret);
> > +return -EINVAL;
> > +}
> > +
> > +if ((data.device_status & OP_STATUS_SRC) != OP_STATUS_SRC ||
> > +    (data.device_status & OP_STATUS_DEV) != CYAPA_DEV_NORMAL ||
> > +    (data.finger_btn & OP_DATA_VALID) != OP_DATA_VALID) {
> > +dev_err(dev, "invalid device state bytes, %02x %02x\n",
> > +data.device_status, data.finger_btn);
> > +return -EINVAL;
> > +}
> > +
> > +num_fingers = (data.finger_btn >> 4) & 0x0f;
> > +for (i = 0; i < num_fingers; i++) {
> > +const struct cyapa_touch *touch = &data.touches[i];
> > +/* Note: touch->id range is 1 to 15; slots are 0 to 14. */
> > +int slot = touch->id - 1;
> > +
> > +input_mt_slot(input, slot);
> > +input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
> > +input_report_abs(input, ABS_MT_POSITION_X,
> > + ((touch->xy_hi & 0xf0) << 4) | touch->x_lo);
> > +input_report_abs(input, ABS_MT_POSITION_Y,
> > + ((touch->xy_hi & 0x0f) << 8) | touch->y_lo);
> > +input_report_abs(input, ABS_MT_PRESSURE, touch->pressure);
> > +}
> > +
> > +input_mt_sync_frame(input);
> > +
> > +if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK)
> > +input_report_key(input, BTN_LEFT,
> > + !!(data.finger_btn & OP_DATA_LEFT_BTN));
> > +if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK)
> > +input_report_key(input, BTN_MIDDLE,
> > + !!(data.finger_btn & OP_DATA_MIDDLE_BTN));
> > +if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK)
> > +input_report_key(input, BTN_RIGHT,
> > + !!(data.finger_btn & OP_DATA_RIGHT_BTN));
> > +input_sync(input);
> > +
> > +return 0;
> > +}
> > +
> > +const struct cyapa_dev_ops cyapa_gen3_ops = {
> > +.state_parse = cyapa_gen3_state_parse,
> > +.operational_check = cyapa_gen3_do_operational_check,
> > +
> > +.irq_handler = cyapa_gen3_irq_handler,
> > +.irq_cmd_handler = cyapa_gen3_irq_cmd_handler,
> > +
> > +.set_power_mode = cyapa_gen3_set_power_mode,
> > +};
> > --
> > 1.9.1
> >
>
> --
> Dmitry

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