| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Tue, 23 Sep 2014 17:18:39 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Dudley Du <dudley.dulixin@...il.com>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>,
Benson Leung <bleung@...gle.com>,
Patrik Fimml <patrikf@...gle.com>, linux-input@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/14] input: cyapa: re-architecture driver to support
multi-trackpads in one driver
Hi Dudley,
On Fri, Aug 22, 2014 at 04:41:07PM +0800, Dudley Du wrote:
> Dmitry,
>
> Thanks for your feedback.
>
> Thanks,
> Dudley
>
> > -----Original Message-----
> > From: Dmitry Torokhov [mailto:dmitry.torokhov@...il.com]
> > Sent: Friday, August 22, 2014 2:21 AM
> > To: Dudley Du
> > Cc: Rafael J. Wysocki; Benson Leung; Patrik Fimml; linux-input@...r.kernel.org;
> > linux-kernel@...r.kernel.org; Dudley Du
> > Subject: Re: [PATCH v4 1/14] input: cyapa: re-architecture driver to support
> > multi-trackpads in one driver
> >
> > On Thu, Jul 17, 2014 at 02:47:24PM +0800, Dudley Du wrote:
> > > In order to support two different communication protocol based trackpad
> > > device in one cyapa, the new cyapa driver is re-designed with
> > > one cyapa driver core and two devices' functions component.
> > > The cyapa driver core is contained in this patch, it supplies the basic
> > > function with input and kernel system and also defined the interfaces
> > > that the devices' functions component needs to apply and support.
> > > Also, in order to speed up the system boot time, the device states
> > > detecting and probing process is put into the async thread.
> > > TEST=test on Chromebooks.
> > >
> > > Signed-off-by: Dudley Du <dudl@...ress.com>
> > > ---
> > > drivers/input/mouse/Makefile | 4 +-
> > > drivers/input/mouse/cyapa.c | 1083 ++++++++++++++-------------------------
> > ---
> > > drivers/input/mouse/cyapa.h | 275 +++++++++++
> > > 3 files changed, 646 insertions(+), 716 deletions(-)
> > > create mode 100644 drivers/input/mouse/cyapa.h
> > >
> > > diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
> > > index c25efdb..8608eb7 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-$(CONFIG_MOUSE_LOGIBM) += logibm.o
> > > @@ -34,3 +34,5 @@ psmouse-$(CONFIG_MOUSE_PS2_SENTELIC) += sentelic.o
> > > psmouse-$(CONFIG_MOUSE_PS2_TRACKPOINT) += trackpoint.o
> > > psmouse-$(CONFIG_MOUSE_PS2_TOUCHKIT) += touchkit_ps2.o
> > > psmouse-$(CONFIG_MOUSE_PS2_CYPRESS) += cypress_ps2.o
> > > +
> > > +cyapatp-y := cyapa.o
> > > diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
> > > index b409c3d..5fc8dbe 100644
> > > --- a/drivers/input/mouse/cyapa.c
> > > +++ b/drivers/input/mouse/cyapa.c
> > > @@ -6,7 +6,7 @@
> > > * Daniel Kurtz <djkurtz@...omium.org>
> > > * Benson Leung <bleung@...omium.org>
> > > *
> > > - * Copyright (C) 2011-2012 Cypress Semiconductor, Inc.
> > > + * 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
> > > @@ -14,731 +14,114 @@
> > > * more details.
> > > */
> > >
> > > +#include <linux/debugfs.h>
> > > #include <linux/delay.h>
> > > #include <linux/i2c.h>
> > > #include <linux/input.h>
> > > #include <linux/input/mt.h>
> > > #include <linux/interrupt.h>
> > > #include <linux/module.h>
> > > +#include <linux/mutex.h>
> > > #include <linux/slab.h>
> > > +#include <linux/uaccess.h>
> > > +#include <linux/pm_runtime.h>
> > > +#include "cyapa.h"
> > >
> > > -/* APA trackpad firmware generation */
> > > -#define CYAPA_GEN3 0x03 /* support MT-protocol B with tracking ID. */
> > > -
> > > -#define CYAPA_NAME "Cypress APA Trackpad (cyapa)"
> > > -
> > > -/* commands for read/write registers of Cypress trackpad */
> > > -#define CYAPA_CMD_SOFT_RESET 0x00
> > > -#define CYAPA_CMD_POWER_MODE 0x01
> > > -#define CYAPA_CMD_DEV_STATUS 0x02
> > > -#define CYAPA_CMD_GROUP_DATA 0x03
> > > -#define CYAPA_CMD_GROUP_CMD 0x04
> > > -#define CYAPA_CMD_GROUP_QUERY 0x05
> > > -#define CYAPA_CMD_BL_STATUS 0x06
> > > -#define CYAPA_CMD_BL_HEAD 0x07
> > > -#define CYAPA_CMD_BL_CMD 0x08
> > > -#define CYAPA_CMD_BL_DATA 0x09
> > > -#define CYAPA_CMD_BL_ALL 0x0a
> > > -#define CYAPA_CMD_BLK_PRODUCT_ID 0x0b
> > > -#define CYAPA_CMD_BLK_HEAD 0x0c
> > > -
> > > -/* report data start reg offset address. */
> > > -#define DATA_REG_START_OFFSET 0x0000
> > > -
> > > -#define BL_HEAD_OFFSET 0x00
> > > -#define BL_DATA_OFFSET 0x10
> > > -
> > > -/*
> > > - * Operational Device Status Register
> > > - *
> > > - * bit 7: Valid interrupt source
> > > - * bit 6 - 4: Reserved
> > > - * bit 3 - 2: Power status
> > > - * bit 1 - 0: Device status
> > > - */
> > > -#define REG_OP_STATUS 0x00
> > > -#define OP_STATUS_SRC 0x80
> > > -#define OP_STATUS_POWER 0x0c
> > > -#define OP_STATUS_DEV 0x03
> > > -#define OP_STATUS_MASK (OP_STATUS_SRC | OP_STATUS_POWER | OP_STATUS_DEV)
> > > -
> > > -/*
> > > - * Operational Finger Count/Button Flags Register
> > > - *
> > > - * bit 7 - 4: Number of touched finger
> > > - * bit 3: Valid data
> > > - * bit 2: Middle Physical Button
> > > - * bit 1: Right Physical Button
> > > - * bit 0: Left physical Button
> > > - */
> > > -#define REG_OP_DATA1 0x01
> > > -#define OP_DATA_VALID 0x08
> > > -#define OP_DATA_MIDDLE_BTN 0x04
> > > -#define OP_DATA_RIGHT_BTN 0x02
> > > -#define OP_DATA_LEFT_BTN 0x01
> > > -#define OP_DATA_BTN_MASK (OP_DATA_MIDDLE_BTN | OP_DATA_RIGHT_BTN | \
> > > - OP_DATA_LEFT_BTN)
> > > -
> > > -/*
> > > - * Bootloader Status Register
> > > - *
> > > - * bit 7: Busy
> > > - * bit 6 - 5: Reserved
> > > - * bit 4: Bootloader running
> > > - * bit 3 - 1: Reserved
> > > - * bit 0: Checksum valid
> > > - */
> > > -#define REG_BL_STATUS 0x01
> > > -#define BL_STATUS_BUSY 0x80
> > > -#define BL_STATUS_RUNNING 0x10
> > > -#define BL_STATUS_DATA_VALID 0x08
> > > -#define BL_STATUS_CSUM_VALID 0x01
> > > -
> > > -/*
> > > - * Bootloader Error Register
> > > - *
> > > - * bit 7: Invalid
> > > - * bit 6: Invalid security key
> > > - * bit 5: Bootloading
> > > - * bit 4: Command checksum
> > > - * bit 3: Flash protection error
> > > - * bit 2: Flash checksum error
> > > - * bit 1 - 0: Reserved
> > > - */
> > > -#define REG_BL_ERROR 0x02
> > > -#define BL_ERROR_INVALID 0x80
> > > -#define BL_ERROR_INVALID_KEY 0x40
> > > -#define BL_ERROR_BOOTLOADING 0x20
> > > -#define BL_ERROR_CMD_CSUM 0x10
> > > -#define BL_ERROR_FLASH_PROT 0x08
> > > -#define BL_ERROR_FLASH_CSUM 0x04
> > > -
> > > -#define BL_STATUS_SIZE 3 /* length of bootloader status registers */
> > > -#define BLK_HEAD_BYTES 32
> > > -
> > > -#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 CAPABILITY_LEFT_BTN_MASK (0x01 << 3)
> > > -#define CAPABILITY_RIGHT_BTN_MASK (0x01 << 4)
> > > -#define CAPABILITY_MIDDLE_BTN_MASK (0x01 << 5)
> > > -#define CAPABILITY_BTN_MASK (CAPABILITY_LEFT_BTN_MASK | \
> > > - CAPABILITY_RIGHT_BTN_MASK | \
> > > - CAPABILITY_MIDDLE_BTN_MASK)
> > > -
> > > -#define CYAPA_OFFSET_SOFT_RESET REG_OFFSET_COMMAND_BASE
> > > -
> > > -#define REG_OFFSET_POWER_MODE (REG_OFFSET_COMMAND_BASE + 1)
> > > -
> > > -#define PWR_MODE_MASK 0xfc
> > > -#define PWR_MODE_FULL_ACTIVE (0x3f << 2)
> > > -#define PWR_MODE_IDLE (0x05 << 2) /* default sleep time is 50 ms. */
> > > -#define PWR_MODE_OFF (0x00 << 2)
> > > -
> > > -#define PWR_STATUS_MASK 0x0c
> > > -#define PWR_STATUS_ACTIVE (0x03 << 2)
> > > -#define PWR_STATUS_IDLE (0x02 << 2)
> > > -#define PWR_STATUS_OFF (0x00 << 2)
> > > -
> > > -/*
> > > - * 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
> > > -
> > > -enum cyapa_state {
> > > - CYAPA_STATE_OP,
> > > - CYAPA_STATE_BL_IDLE,
> > > - CYAPA_STATE_BL_ACTIVE,
> > > - CYAPA_STATE_BL_BUSY,
> > > - CYAPA_STATE_NO_DEVICE,
> > > -};
> > > -
> > > -
> > > -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;
> > > -
> > > -/* The touch.id is used as the MT slot id, thus max MT slot is 15 */
> > > -#define CYAPA_MAX_MT_SLOTS 15
> > > -
> > > -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;
> > > -
> > > -/* The main device structure */
> > > -struct cyapa {
> > > - enum cyapa_state state;
> > > -
> > > - struct i2c_client *client;
> > > - struct input_dev *input;
> > > - char phys[32]; /* device physical location */
> > > - int irq;
> > > - bool irq_wake; /* irq wake is enabled */
> > > - bool smbus;
> > > -
> > > - /* read from query data region. */
> > > - char product_id[16];
> > > - u8 btn_capability;
> > > - u8 gen;
> > > - int max_abs_x;
> > > - int max_abs_y;
> > > - int physical_size_x;
> > > - int physical_size_y;
> > > -};
> > > -
> > > -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 };
> > > -
> > > -struct cyapa_cmd_len {
> > > - u8 cmd;
> > > - u8 len;
> > > -};
> > >
> > > #define CYAPA_ADAPTER_FUNC_NONE 0
> > > #define CYAPA_ADAPTER_FUNC_I2C 1
> > > #define CYAPA_ADAPTER_FUNC_SMBUS 2
> > > #define CYAPA_ADAPTER_FUNC_BOTH 3
> > >
> > > -/*
> > > - * macros for SMBus communication
> > > - */
> > > -#define SMBUS_READ 0x01
> > > -#define SMBUS_WRITE 0x00
> > > -#define SMBUS_ENCODE_IDX(cmd, idx) ((cmd) | (((idx) & 0x03) << 1))
> > > -#define SMBUS_ENCODE_RW(cmd, rw) ((cmd) | ((rw) & 0x01))
> > > -#define SMBUS_BYTE_BLOCK_CMD_MASK 0x80
> > > -#define SMBUS_GROUP_BLOCK_CMD_MASK 0x40
> > > -
> > > - /* for byte read/write command */
> > > -#define CMD_RESET 0
> > > -#define CMD_POWER_MODE 1
> > > -#define CMD_DEV_STATUS 2
> > > -#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)
> > > -
> > > - /* 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)
> > > -
> > > -static const struct cyapa_cmd_len cyapa_i2c_cmds[] = {
> > > - { CYAPA_OFFSET_SOFT_RESET, 1 },
> > > - { REG_OFFSET_COMMAND_BASE + 1, 1 },
> > > - { REG_OFFSET_DATA_BASE, 1 },
> > > - { REG_OFFSET_DATA_BASE, sizeof(struct cyapa_reg_data) },
> > > - { REG_OFFSET_COMMAND_BASE, 0 },
> > > - { REG_OFFSET_QUERY_BASE, QUERY_DATA_SIZE },
> > > - { BL_HEAD_OFFSET, 3 },
> > > - { BL_HEAD_OFFSET, 16 },
> > > - { BL_HEAD_OFFSET, 16 },
> > > - { BL_DATA_OFFSET, 16 },
> > > - { BL_HEAD_OFFSET, 32 },
> > > - { REG_OFFSET_QUERY_BASE, PRODUCT_ID_SIZE },
> > > - { REG_OFFSET_DATA_BASE, 32 }
> > > -};
> > > +#define CYAPA_DEBUGFS_READ_FW "read_fw"
> > > +#define CYAPA_DEBUGFS_RAW_DATA "raw_data"
> > > +#define CYAPA_FW_NAME "cyapa.bin"
> > > +
> > > +const char unique_str[] = "CYTRA";
> > > +
> > >
> > > -static const struct cyapa_cmd_len cyapa_smbus_cmds[] = {
> > > - { CYAPA_SMBUS_RESET, 1 },
> > > - { CYAPA_SMBUS_POWER_MODE, 1 },
> > > - { CYAPA_SMBUS_DEV_STATUS, 1 },
> > > - { CYAPA_SMBUS_GROUP_DATA, sizeof(struct cyapa_reg_data) },
> > > - { CYAPA_SMBUS_GROUP_CMD, 2 },
> > > - { CYAPA_SMBUS_GROUP_QUERY, QUERY_DATA_SIZE },
> > > - { CYAPA_SMBUS_BL_STATUS, 3 },
> > > - { CYAPA_SMBUS_BL_HEAD, 16 },
> > > - { CYAPA_SMBUS_BL_CMD, 16 },
> > > - { CYAPA_SMBUS_BL_DATA, 16 },
> > > - { CYAPA_SMBUS_BL_ALL, 32 },
> > > - { CYAPA_SMBUS_BLK_PRODUCT_ID, PRODUCT_ID_SIZE },
> > > - { CYAPA_SMBUS_BLK_HEAD, 16 },
> > > -};
> > >
> > > -static ssize_t cyapa_i2c_reg_read_block(struct cyapa *cyapa, u8 reg, size_t
> > len,
> > > +ssize_t cyapa_i2c_reg_read_block(struct cyapa *cyapa, u8 reg, size_t len,
> > > u8 *values)
> > > {
> > > return i2c_smbus_read_i2c_block_data(cyapa->client, reg, len, values);
> > > }
> > >
> > > -static ssize_t cyapa_i2c_reg_write_block(struct cyapa *cyapa, u8 reg,
> > > +ssize_t cyapa_i2c_reg_write_block(struct cyapa *cyapa, u8 reg,
> > > size_t len, const u8 *values)
> > > {
> > > return i2c_smbus_write_i2c_block_data(cyapa->client, reg, len, values);
> > > }
> > >
> > > -/*
> > > - * 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.
> > > - */
> > > -static 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;
> > > -}
> > > -
> > > -static 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);
> > > -}
> > > -
> > > -static 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);
> > > -}
> > > -
> > > -static 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);
> > > - } else {
> > > - cmd = cyapa_i2c_cmds[cmd_idx].cmd;
> > > - len = cyapa_i2c_cmds[cmd_idx].len;
> > > - return cyapa_i2c_reg_read_block(cyapa, cmd, len, values);
> > > - }
> > > -}
> > > -
> > > -/*
> > > - * Query device for its current operating state.
> > > - *
> > > - */
> > > -static int cyapa_get_state(struct cyapa *cyapa)
> > > +/* Returns 0 on success, else negative errno on failure. */
> > > +ssize_t cyapa_i2c_read(struct cyapa *cyapa, u8 reg, size_t len,
> > > + u8 *values)
> > > {
> > > int ret;
> > > - u8 status[BL_STATUS_SIZE];
> > > -
> > > - 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))
> > > - ret = cyapa_read_block(cyapa, CYAPA_CMD_BL_STATUS, status);
> > > -
> > > - if (ret != BL_STATUS_SIZE)
> > > - goto error;
> > > -
> > > - if ((status[REG_OP_STATUS] & OP_STATUS_SRC) == OP_STATUS_SRC) {
> > > - switch (status[REG_OP_STATUS] & OP_STATUS_DEV) {
> > > - case CYAPA_DEV_NORMAL:
> > > - case CYAPA_DEV_BUSY:
> > > - cyapa->state = CYAPA_STATE_OP;
> > > - break;
> > > - default:
> > > - ret = -EAGAIN;
> > > - goto error;
> > > - }
> > > - } else {
> > > - if (status[REG_BL_STATUS] & BL_STATUS_BUSY)
> > > - cyapa->state = CYAPA_STATE_BL_BUSY;
> > > - else if (status[REG_BL_ERROR] & BL_ERROR_BOOTLOADING)
> > > - cyapa->state = CYAPA_STATE_BL_ACTIVE;
> > > - else
> > > - cyapa->state = CYAPA_STATE_BL_IDLE;
> > > - }
> > > -
> > > - return 0;
> > > -error:
> > > - return (ret < 0) ? ret : -EAGAIN;
> > > + struct i2c_client *client = cyapa->client;
> > > + struct i2c_msg msgs[] = {
> > > + {
> > > + .addr = client->addr,
> > > + .flags = 0,
> > > + .len = 1,
> > > + .buf = ®,
> > > + },
> > > + {
> > > + .addr = client->addr,
> > > + .flags = I2C_M_RD,
> > > + .len = len,
> > > + .buf = values,
> > > + },
> > > + };
> > > +
> > > + ret = i2c_transfer(client->adapter, msgs, 2);
> >
> > You need to watch out for partial transfers. It should be:
> >
> > if (ret != ARRAY_SIZE(msgs))
> > return ret < 0 ? ret : -EIO;
> >
> > return 0;
> >
>
> Thanks, I will update in next release.
>
> > > +
> > > + return ret < 0 ? ret : 0;
> > > }
> > >
> > > -/*
> > > - * Poll device for its status in a loop, waiting up to timeout for a
> > response.
> > > - *
> > > - * When the device switches state, it usually takes ~300 ms.
> > > - * However, when running a new firmware image, the device must calibrate
> > its
> > > - * sensors, which can take as long as 2 seconds.
> > > +/**
> > > + * cyapa_i2c_write - Execute i2c block data write operation
> > > + * @cyapa: Handle to this driver
> > > + * @ret: Offset of the data to written in the register map
> > > + * @len: number of bytes to write
> > > + * @values: Data to be written
> > > *
> > > - * Note: The timeout has granularity of the polling rate, which is 100 ms.
> > > - *
> > > - * Returns:
> > > - * 0 when the device eventually responds with a valid non-busy state.
> > > - * -ETIMEDOUT if device never responds (too many -EAGAIN)
> > > - * < 0 other errors
> > > + * Return negative errno code on error; return zero when success.
> > > */
> > > -static int cyapa_poll_state(struct cyapa *cyapa, unsigned int timeout)
> > > +ssize_t cyapa_i2c_write(struct cyapa *cyapa, u8 reg,
> > > + size_t len, const void *values)
> > > {
> > > int ret;
> > > - int tries = timeout / 100;
> > > -
> > > - ret = cyapa_get_state(cyapa);
> > > - while ((ret || cyapa->state >= CYAPA_STATE_BL_BUSY) && tries--) {
> > > - msleep(100);
> > > - ret = cyapa_get_state(cyapa);
> > > - }
> > > - return (ret == -EAGAIN || ret == -ETIMEDOUT) ? -ETIMEDOUT : ret;
> > > -}
> > > + struct i2c_client *client = cyapa->client;
> > > + char data[32], *buf;
> > >
> > > -static int cyapa_bl_deactivate(struct cyapa *cyapa)
> > > -{
> > > - int ret;
> > > + if (len > 31)
> > > + buf = kzalloc(len + 1, GFP_KERNEL);
> > > + else
> > > + buf = data;
> > >
> > > - ret = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_deactivate),
> > > - bl_deactivate);
> > > - if (ret < 0)
> > > - return ret;
> > > + buf[0] = reg;
> > > + memcpy(&buf[1], values, len);
> > > + ret = i2c_master_send(client, buf, len + 1);
> > >
> > > - /* 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;
> > > + if (buf != data)
> > > + kfree(buf);
> > > + return (ret == (len + 1)) ? 0 : ((ret < 0) ? ret : -EIO);
> > > }
> > >
> > > -/*
> > > - * 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_bl_exit(struct cyapa *cyapa)
> > > +void cyapa_default_irq_handler(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.
> > > + * Do redetecting when device states is still unknown and
> > > + * interrupt envent is received from device.
> > > */
> > > - ret = cyapa_poll_state(cyapa, 2000);
> > > - if (ret < 0)
> > > - return ret;
> > > - if (cyapa->state != CYAPA_STATE_OP)
> > > - return -EAGAIN;
> > > -
> > > - return 0;
> > > -}
> > > -
> > > -/*
> > > - * Set device power mode
> > > - *
> > > - */
> > > -static int cyapa_set_power_mode(struct cyapa *cyapa, u8 power_mode)
> > > -{
> > > - struct device *dev = &cyapa->client->dev;
> > > - int ret;
> > > - u8 power;
> > > -
> > > - if (cyapa->state != CYAPA_STATE_OP)
> > > - return 0;
> > > -
> > > - ret = cyapa_read_byte(cyapa, CYAPA_CMD_POWER_MODE);
> > > - if (ret < 0)
> > > - return ret;
> > > -
> > > - power = ret & ~PWR_MODE_MASK;
> > > - power |= power_mode & PWR_MODE_MASK;
> > > - ret = cyapa_write_byte(cyapa, CYAPA_CMD_POWER_MODE, power);
> > > - if (ret < 0)
> > > - dev_err(dev, "failed to set power_mode 0x%02x err = %d\n",
> > > - power_mode, ret);
> > > - return ret;
> > > -}
> > > -
> > > -static int cyapa_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 < 0)
> > > - return ret;
> > > - if (ret != QUERY_DATA_SIZE)
> > > - return -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->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];
> > > -
> > > - return 0;
> > > + async_schedule(cyapa_detect_async, cyapa);
> >
> > I think I already asked this before - why do we need to try and schedule async
> > detect from interrupt handler. In what cases we will fail to initialize the
> > device during normal probing, but then are fine when stray interrupt arrives?
> >
>
> 1) Because gen5 TP devices use interrupt to sync the command and response, and
> in detecting, some commands must be sent and executed in attached devices, so
> the interrupt must be usable in detecting.
> So if do not schedule async detect from interrupt handler, the interrupt
> handler will be taken, and cannot enter again, which will cause the command to
> the device failed, it will also cause long time detecting.
> 2) detecting will fail when no device attached or the attached device is not
> supported gen3 or gen5 TP devices or there is some issue with the device
> that cannot enter into active working mode or stay in bootloader mode
> for invalid firmware detected.
> And it's tested that it's save when stray interrupt arrives in detecting.
I am sorry, I have trouble parsing this. I understand that you may need
interrupt to know when command response is ready, but I do not see how
kicking asynchronous detect helps there. During probe you can figure out
if you are talking to a Cypress device and whether it is operable. If it
is not operable you can try flashing a new firmware and then kick off
detection again after flash is successful. But I do not see any reason
in trying to re-detect the device after random interrupt arrives in hopes
that maybe this time stars will align and we'll be able to work with it.
>
> Thanks.
>
>
> > > }
> > >
> > > -/*
> > > - * 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_check_is_operational(struct cyapa *cyapa)
> > > -{
> > > - struct device *dev = &cyapa->client->dev;
> > > - static const char unique_str[] = "CYTRA";
> > > - int ret;
> > > -
> > > - ret = cyapa_poll_state(cyapa, 2000);
> > > - if (ret < 0)
> > > - return ret;
> > > - switch (cyapa->state) {
> > > - case CYAPA_STATE_BL_ACTIVE:
> > > - ret = cyapa_bl_deactivate(cyapa);
> > > - if (ret)
> > > - return ret;
> > > -
> > > - /* Fallthrough state */
> > > - case CYAPA_STATE_BL_IDLE:
> > > - ret = cyapa_bl_exit(cyapa);
> > > - if (ret)
> > > - return ret;
> > > -
> > > - /* Fallthrough state */
> > > - case CYAPA_STATE_OP:
> > > - ret = cyapa_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,
> > > - sizeof(unique_str) - 1) != 0) {
> > > - dev_err(dev, "unsupported product ID (%s)\n",
> > > - cyapa->product_id);
> > > - return -EINVAL;
> > > - }
> > > - return 0;
> > > -
> > > - default:
> > > - return -EIO;
> > > - }
> > > - return 0;
> > > -}
> > > -
> > > -static irqreturn_t cyapa_irq(int irq, void *dev_id)
> > > -{
> > > - struct cyapa *cyapa = dev_id;
> > > - struct device *dev = &cyapa->client->dev;
> > > - struct input_dev *input = cyapa->input;
> > > - struct cyapa_reg_data data;
> > > - int i;
> > > - int ret;
> > > - int num_fingers;
> > > -
> > > - if (device_may_wakeup(dev))
> > > - pm_wakeup_event(dev, 0);
> > > -
> > > - ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_DATA, (u8 *)&data);
> > > - if (ret != sizeof(data))
> > > - goto out;
> > > -
> > > - 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) {
> > > - goto out;
> > > - }
> > > -
> > > - 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);
> > > +const struct cyapa_dev_ops cyapa_default_ops = {
> > > + .irq_handler = cyapa_default_irq_handler
> > > +};
> > >
> > > -out:
> > > - return IRQ_HANDLED;
> > > -}
> > >
> > > static u8 cyapa_check_adapter_functionality(struct i2c_client *client)
> > > {
> > > @@ -772,19 +155,40 @@ static int cyapa_create_input_dev(struct cyapa *cyapa)
> > > input->phys = cyapa->phys;
> > > input->id.bustype = BUS_I2C;
> > > input->id.version = 1;
> > > - input->id.product = 0; /* means any product in eventcomm. */
> > > + input->id.product = 0; /* Means any product in eventcomm. */
> > > input->dev.parent = &cyapa->client->dev;
> > >
> > > input_set_drvdata(input, cyapa);
> > >
> > > __set_bit(EV_ABS, input->evbit);
> > >
> > > - /* finger position */
> > > + /* Finger position */
> > > input_set_abs_params(input, ABS_MT_POSITION_X, 0, cyapa->max_abs_x, 0,
> > > 0);
> > > input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cyapa->max_abs_y, 0,
> > > 0);
> > > - input_set_abs_params(input, ABS_MT_PRESSURE, 0, 255, 0, 0);
> > > + input_set_abs_params(input, ABS_MT_PRESSURE, 0, cyapa->max_z, 0, 0);
> > > + if (cyapa->gen > CYAPA_GEN3) {
> > > + input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
> > > + input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
> > > + /*
> > > + * Orientation is the angle between the vertical axis and
> > > + * the major axis of the contact ellipse.
> > > + * The range is -127 to 127.
> > > + * the positive direction is clockwise form the vertical axis.
> > > + * If the ellipse of contact degenerates into a circle,
> > > + * orientation is reported as 0.
> > > + *
> > > + * Also, for Gen5 trackpad the accurate of this orientation
> > > + * value is value + (-30 ~ 30).
> > > + */
> > > + input_set_abs_params(input, ABS_MT_ORIENTATION,
> > > + -127, 127, 0, 0);
> > > + }
> > > + if (cyapa->gen >= CYAPA_GEN5) {
> > > + input_set_abs_params(input, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
> > > + input_set_abs_params(input, ABS_MT_WIDTH_MINOR, 0, 255, 0, 0);
> > > + }
> > >
> > > input_abs_set_res(input, ABS_MT_POSITION_X,
> > > cyapa->max_abs_x / cyapa->physical_size_x);
> > > @@ -801,7 +205,7 @@ static int cyapa_create_input_dev(struct cyapa *cyapa)
> > > if (cyapa->btn_capability == CAPABILITY_LEFT_BTN_MASK)
> > > __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
> > >
> > > - /* handle pointer emulation and unused slots in core */
> > > + /* Handle pointer emulation and unused slots in core */
> > > ret = input_mt_init_slots(input, CYAPA_MAX_MT_SLOTS,
> > > INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
> > > if (ret) {
> > > @@ -823,6 +227,224 @@ err_free_device:
> > > return ret;
> > > }
> > >
> > > +/*
> > > + * 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_check_is_operational(struct cyapa *cyapa)
> > > +{
> > > + int ret;
> > > +
> > > + ret = cyapa_poll_state(cyapa, 4000);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + switch (cyapa->gen) {
> > > + default:
> > > + cyapa->ops = &cyapa_default_ops;
> > > + cyapa->gen = CYAPA_GEN_UNKNOWN;
> > > + break;
> > > + }
> > > +
> > > + if (cyapa->ops->operational_check)
> > > + ret = cyapa->ops->operational_check(cyapa);
> > > + else
> > > + ret = -EBUSY;
> > > +
> > > + return ret;
> > > +}
> > > +
> > > +
> > > +static irqreturn_t cyapa_irq(int irq, void *dev_id)
> > > +{
> > > + struct cyapa *cyapa = dev_id;
> > > + struct input_dev *input = cyapa->input;
> > > + bool cont;
> > > +
> > > + /* Interrupt event maybe cuased by host command to trackpad device. */
> > > + cont = true;
> > > + if (cyapa->ops->irq_cmd_handler)
> > > + cont = cyapa->ops->irq_cmd_handler(cyapa);
> > > +
> > > + /* Interrupt event maybe from trackpad device input reporting. */
> > > + if (cont && cyapa->ops->irq_handler) {
> > > + if (!mutex_trylock(&cyapa->state_sync_lock)) {
> > > + if (cyapa->ops->sort_empty_output_data)
> > > + cyapa->ops->sort_empty_output_data(cyapa,
> > > + NULL, NULL, NULL);
> > > + goto out;
> > > + }
> > > +
> > > + if (!input) {
> > > + if (cyapa->ops->sort_empty_output_data)
> > > + cyapa->ops->sort_empty_output_data(cyapa,
> > > + NULL, NULL, NULL);
> > > + } else
> > > + cyapa->ops->irq_handler(cyapa);
> > > +
> > > + mutex_unlock(&cyapa->state_sync_lock);
> > > + }
> > > +out:
> > > + return IRQ_HANDLED;
> > > +}
> > > +
> > > +/*
> > > + * Query device for its current operating state.
> > > + */
> > > +static int cyapa_get_state(struct cyapa *cyapa)
> > > +{
> > > + cyapa->state = CYAPA_STATE_NO_DEVICE;
> > > +
> > > + return -ENODEV;
> > > +}
> > > +
> > > +/*
> > > + * Poll device for its status in a loop, waiting up to timeout for a
> > response.
> > > + *
> > > + * When the device switches state, it usually takes ~300 ms.
> > > + * However, when running a new firmware image, the device must calibrate
> > its
> > > + * sensors, which can take as long as 2 seconds.
> > > + *
> > > + * Note: The timeout has granularity of the polling rate, which is 100 ms.
> > > + *
> > > + * Returns:
> > > + * 0 when the device eventually responds with a valid non-busy state.
> > > + * -ETIMEDOUT if device never responds (too many -EAGAIN)
> > > + * < 0 other errors
> > > + */
> > > +int cyapa_poll_state(struct cyapa *cyapa, unsigned int timeout)
> > > +{
> > > + int ret;
> > > + int tries = timeout / 100;
> > > +
> > > + ret = cyapa_get_state(cyapa);
> > > + while ((ret || cyapa->state >= CYAPA_STATE_BL_BUSY) && tries--) {
> > > + msleep(100);
> > > + ret = cyapa_get_state(cyapa);
> > > + }
> > > +
> > > + return (ret == -EAGAIN || ret == -ETIMEDOUT) ? -ETIMEDOUT : ret;
> > > +}
> > > +
> > > +static void cyapa_detect(struct cyapa *cyapa)
> > > +{
> > > + struct device *dev = &cyapa->client->dev;
> > > + char *envp[2] = {"ERROR=1", NULL};
> > > + int ret;
> > > +
> > > + ret = cyapa_check_is_operational(cyapa);
> > > + if (ret == -ETIMEDOUT)
> > > + dev_err(dev, "no device detected, %d\n", ret);
> > > + else if (ret)
> > > + dev_err(dev, "device detected, but not operational, %d\n", ret);
> > > +
> > > + if (ret) {
> > > + kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
> > > + return;
> > > + }
> > > +
> > > + if (!cyapa->input) {
> > > + ret = cyapa_create_input_dev(cyapa);
> > > + if (ret)
> > > + dev_err(dev, "create input_dev instance failed, %d\n",
> > > + ret);
> > > +
> > > + /*
> > > + * On some systems, a system crash / warm boot does not reset
> > > + * the device's current power mode to FULL_ACTIVE.
> > > + * If such an event happens during suspend, after the device
> > > + * has been put in a low power mode, the device will still be
> > > + * in low power mode on a subsequent boot, since there was
> > > + * never a matching resume().
> > > + * Handle this by always forcing full power here, when a
> > > + * device is first detected to be in operational mode.
> > > + */
> > > + if (cyapa->ops->set_power_mode) {
> > > + ret = cyapa->ops->set_power_mode(cyapa,
> > > + PWR_MODE_FULL_ACTIVE, 0);
> > > + if (ret)
> > > + dev_warn(dev, "set active power failed, %d\n",
> > > + ret);
> > > + }
> > > + }
> > > +}
> > > +
> > > +/*
> > > + * Sysfs Interface.
> > > + */
> > > +
> > > +/*
> > > + * cyapa_sleep_time_to_pwr_cmd and cyapa_pwr_cmd_to_sleep_time
> > > + *
> > > + * These are helper functions that convert to and from integer idle
> > > + * times and register settings to write to the PowerMode register.
> > > + * The trackpad supports between 20ms to 1000ms scan intervals.
> > > + * The time will be increased in increments of 10ms from 20ms to 100ms.
> > > + * From 100ms to 1000ms, time will be increased in increments of 20ms.
> > > + *
> > > + * When Idle_Time < 100, the format to convert Idle_Time to Idle_Command is:
> > > + * Idle_Command = Idle Time / 10;
> > > + * When Idle_Time >= 100, the format to convert Idle_Time to Idle_Command
> > is:
> > > + * Idle_Command = Idle Time / 20 + 5;
> > > + */
> > > +u8 cyapa_sleep_time_to_pwr_cmd(u16 sleep_time)
> > > +{
> > > + if (sleep_time < 20)
> > > + sleep_time = 20; /* minimal sleep time. */
> > > + else if (sleep_time > 1000)
> > > + sleep_time = 1000; /* maximal sleep time. */
> >
> > clamp_val()
>
> Thanks. clamp_pwr_cmd_sleep_time() will be used to above code.
No, we have a macro called clamp_val() which does exactly what you are
doing here by hand. So please use
sleep_time = clamp_val(sleep_time, 20, 1000);
>
> >
> > > +
> > > + if (sleep_time < 100)
> > > + return ((sleep_time / 10) << 2) & PWR_MODE_MASK;
> > > + else
> > > + return ((sleep_time / 20 + 5) << 2) & PWR_MODE_MASK;
> > > +}
> > > +
> > > +u16 cyapa_pwr_cmd_to_sleep_time(u8 pwr_mode)
> > > +{
> > > + u8 encoded_time = pwr_mode >> 2;
> > > +
> > > + return (encoded_time < 10) ? encoded_time * 10
> > > + : (encoded_time - 5) * 20;
> > > +}
> > > +
> > > +void cyapa_detect_async(void *data, async_cookie_t cookie)
> > > +{
> > > + struct cyapa *cyapa = (struct cyapa *)data;
> > > +
> > > + mutex_lock(&cyapa->state_sync_lock);
> > > +
> > > + /* Keep synchronized with sys interface process threads. */
> > > + cyapa_detect(cyapa);
> > > +
> > > + mutex_unlock(&cyapa->state_sync_lock);
> > > +}
> > > +
> > > +static void cyapa_detect_and_start(void *data, async_cookie_t cookie)
> > > +{
> > > + cyapa_detect_async(data, cookie);
> > > +}
> > > +
> > > +static int cyapa_tp_modules_init(struct cyapa *cyapa)
> > > +{
> > > + return 0;
> > > +}
> > > +
> > > +static int cyapa_tp_modules_uninit(struct cyapa *cyapa)
> > > +{
> > > + return 0;
> > > +}
> > > +
> > > static int cyapa_probe(struct i2c_client *client,
> > > const struct i2c_device_id *dev_id)
> > > {
> > > @@ -830,6 +452,7 @@ static int cyapa_probe(struct i2c_client *client,
> > > u8 adapter_func;
> > > struct cyapa *cyapa;
> > > struct device *dev = &client->dev;
> > > + union i2c_smbus_data dummy;
> > >
> > > adapter_func = cyapa_check_adapter_functionality(client);
> > > if (adapter_func == CYAPA_ADAPTER_FUNC_NONE) {
> > > @@ -837,39 +460,43 @@ static int cyapa_probe(struct i2c_client *client,
> > > return -EIO;
> > > }
> > >
> > > + /* Make sure there is something at this address */
> > > + if (dev->of_node && i2c_smbus_xfer(client->adapter, client->addr, 0,
> > > + I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0)
> > > + return -ENODEV;
> > > +
> > > cyapa = kzalloc(sizeof(struct cyapa), GFP_KERNEL);
> > > if (!cyapa) {
> > > dev_err(dev, "allocate memory for cyapa failed\n");
> > > return -ENOMEM;
> > > }
> > >
> > > - cyapa->gen = CYAPA_GEN3;
> > > cyapa->client = client;
> > > i2c_set_clientdata(client, cyapa);
> > > sprintf(cyapa->phys, "i2c-%d-%04x/input0", client->adapter->nr,
> > > client->addr);
> > >
> > > - /* i2c isn't supported, use smbus */
> > > - if (adapter_func == CYAPA_ADAPTER_FUNC_SMBUS)
> > > - cyapa->smbus = true;
> > > - cyapa->state = CYAPA_STATE_NO_DEVICE;
> > > - ret = cyapa_check_is_operational(cyapa);
> > > + ret = cyapa_tp_modules_init(cyapa);
> > > if (ret) {
> > > - dev_err(dev, "device not operational, %d\n", ret);
> > > - goto err_mem_free;
> > > + dev_err(dev, "initialize device modules failed.\n");
> > > + goto err_unregister_device;
> > > }
> > >
> > > - ret = cyapa_create_input_dev(cyapa);
> > > - if (ret) {
> > > - dev_err(dev, "create input_dev instance failed, %d\n", ret);
> > > - goto err_mem_free;
> > > - }
> > > + cyapa->gen = CYAPA_GEN_UNKNOWN;
> > > + cyapa->ops = &cyapa_default_ops;
> > > + mutex_init(&cyapa->state_sync_lock);
> > >
> > > - ret = cyapa_set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE);
> > > - if (ret) {
> > > - dev_err(dev, "set active power failed, %d\n", ret);
> > > - goto err_unregister_device;
> > > - }
> > > + /* i2c isn't supported, use smbus */
> > > + if (adapter_func == CYAPA_ADAPTER_FUNC_SMBUS)
> > > + cyapa->smbus = true;
> > > + cyapa->state = CYAPA_STATE_NO_DEVICE;
> > > + /*
> > > + * Set to hard code default, they will be updated with trackpad set
> > > + * default values after probe and initialized.
> > > + */
> > > + cyapa->suspend_power_mode = PWR_MODE_SLEEP;
> > > + cyapa->suspend_sleep_time =
> > > + cyapa_pwr_cmd_to_sleep_time(cyapa->suspend_power_mode);
> > >
> > > cyapa->irq = client->irq;
> > > ret = request_threaded_irq(cyapa->irq,
> > > @@ -880,14 +507,17 @@ static int cyapa_probe(struct i2c_client *client,
> > > cyapa);
> > > if (ret) {
> > > dev_err(dev, "IRQ request failed: %d\n, ", ret);
> > > - goto err_unregister_device;
> > > + goto err_uninit_tp_modules;
> > > }
> > >
> > > + async_schedule(cyapa_detect_and_start, cyapa);
> > > return 0;
> > >
> > > +err_uninit_tp_modules:
> > > + cyapa_tp_modules_uninit(cyapa);
> > > err_unregister_device:
> > > input_unregister_device(cyapa->input);
> > > -err_mem_free:
> > > + i2c_set_clientdata(client, NULL);
> > > kfree(cyapa);
> > >
> > > return ret;
> > > @@ -898,8 +528,12 @@ static int cyapa_remove(struct i2c_client *client)
> > > struct cyapa *cyapa = i2c_get_clientdata(client);
> > >
> >
> > You schedule detect asynchronously so you need to make sure it is not running
> > (and will not be running) when you try to unbind the driver here.
>
> Thanks. I will update it in next release.
>
> To avoid this problem, a removed flag is introduced and is also synced by the
> cyapa->state_sync_lock mutex lock. So when this driver is removing, it's sure
> that the detecting asynchronous thread is not running, and if there's any event
> cause the asynchronous thread is entered, it will do nothing and will exit immediately.
Peeking at the other version of the patch you do:
cyapa_remove()
{
...
cyapa->removed = true;
...
kfree(cyapa);
}
and
void cyapa_detect_async(void *data, async_cookie_t cookie)
{
...
if (cyapa->removed) {
mutex_unlock(&cyapa->state_sync_lock);
return;
}
...
}
That's not going to work.
Getting asynchronous behavior by individual driver is hard and I believe
Luis Rordiguez is working on allowing to do that is the driver core. So
I would recommend to switch driver to do synchronous probing, at least
for now, and figure out other kinks first.
Thanks.
--
Dmitry
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists