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    Subject[PATCH v3 1/1] Input: add driver for Cypress APA I2C Trackpad
    Date
    This patch introduces a driver for Cypress All Points Addressable
    I2C Trackpad, including the ones in 2012 Samsung Chromebooks.

    This device is compatible with MT protocol type B, providing identifiable
    contacts.

    Signed-off-by: Dudley Du <dudl@cypress.com>
    Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
    Signed-off-by: Benson Leung <bleung@chromium.org>
    ---
    Version history :
    v3 : * Handle pointer emulation and unused slots in core
    * Fix compile fail on 3.7 for input_mt_init_slots (Thanks Rydberg)
    * Set BUTTONPAD property only if is a buttonpad based on capabilities.
    * Removed __devinit/__devexit/__devexit_p
    * Set to OFF power mode on cyapa_remove
    * Got rid of kasprintf'd physical location string for static one.

    v2 : * Removed firmware update.
    * Removed sysfs properties related to firmware update and power mode.
    * Folded cyapa_detect into cyapa_probe.
    * Added support for middle and right mechanical buttons, if they exist.
    * Rearranged disable_irq/enable_irq in suspend and resume to prevent
    a power mode change from colliding with a read of tracking data.
    * Made cyapa_get_state more reliable.
    * Use IRQF_ONESHOT for threaded irq
    * Simplified cyapa_set_power_mode.
    * Removed extra kernel-doc style comments
    * Removed dev_dbg messages.
    * Cleaned up unused includes.
    * Cleaned up unused #defines

    v1 : Initial
    ---
    drivers/input/mouse/Kconfig | 12 +
    drivers/input/mouse/Makefile | 1 +
    drivers/input/mouse/cyapa.c | 803 ++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 816 insertions(+), 0 deletions(-)
    create mode 100644 drivers/input/mouse/cyapa.c

    diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
    index cd6268c..23db30a 100644
    --- a/drivers/input/mouse/Kconfig
    +++ b/drivers/input/mouse/Kconfig
    @@ -193,6 +193,18 @@ config MOUSE_BCM5974
    To compile this driver as a module, choose M here: the
    module will be called bcm5974.

    +config MOUSE_CYAPA
    + tristate "Cypress APA I2C Trackpad support"
    + depends on I2C
    + help
    + This driver adds support for Cypress All Points Addressable (APA)
    + I2C Trackpads, including the ones used in 2012 Samsung Chromebooks.
    +
    + Say Y here if you have a Cypress APA I2C Trackpad.
    +
    + To compile this driver as a module, choose M here: the module will be
    + called cyapa.
    +
    config MOUSE_INPORT
    tristate "InPort/MS/ATIXL busmouse"
    depends on ISA
    diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
    index 46ba755..10b4773 100644
    --- a/drivers/input/mouse/Makefile
    +++ b/drivers/input/mouse/Makefile
    @@ -8,6 +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_GPIO) += gpio_mouse.o
    obj-$(CONFIG_MOUSE_INPORT) += inport.o
    obj-$(CONFIG_MOUSE_LOGIBM) += logibm.o
    diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
    new file mode 100644
    index 0000000..0964583
    --- /dev/null
    +++ b/drivers/input/mouse/cyapa.c
    @@ -0,0 +1,803 @@
    +/*
    + * Cypress APA trackpad with I2C interface
    + *
    + * Author: Dudley Du <dudl@cypress.com>
    + * Further cleanup and restructuring by:
    + * Daniel Kurtz <djkurtz@chromium.org>
    + * Benson Leung <bleung@chromium.org>
    + *
    + * Copyright (C) 2011-2012 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/interrupt.h>
    +#include <linux/module.h>
    +#include <linux/slab.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 */
    +
    + /* 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;
    +};
    +
    +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}
    +};
    +
    +static 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,
    + size_t len, const u8 *values)
    +{
    + return i2c_smbus_write_i2c_block_data(cyapa->client, reg, len, values);
    +}
    +
    +static s32 cyapa_read_byte(struct cyapa *cyapa, u8 cmd_idx)
    +{
    + u8 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 = 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 = cyapa_i2c_cmds[cmd_idx].cmd;
    + size_t 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)
    +{
    + 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);
    + 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;
    +}
    +
    +/*
    + * 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
    + */
    +static 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 int cyapa_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_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.
    + */
    + 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;
    +}
    +
    +/*
    + * 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 irqhandled;
    +
    + 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 irqhandled;
    + }
    +
    + 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);
    +
    +irqhandled:
    + return IRQ_HANDLED;
    +}
    +
    +static int cyapa_create_input_dev(struct cyapa *cyapa)
    +{
    + struct device *dev = &cyapa->client->dev;
    + int ret;
    + struct input_dev *input;
    +
    + if (!cyapa->physical_size_x || !cyapa->physical_size_y)
    + return -EINVAL;
    +
    + input = cyapa->input = input_allocate_device();
    + if (!input) {
    + dev_err(dev, "allocate memory for input device failed\n");
    + return -ENOMEM;
    + }
    +
    + input->name = CYAPA_NAME;
    + input->phys = cyapa->phys;
    + input->id.bustype = BUS_I2C;
    + input->id.version = 1;
    + 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 */
    + 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_abs_set_res(input, ABS_MT_POSITION_X,
    + cyapa->max_abs_x / cyapa->physical_size_x);
    + input_abs_set_res(input, ABS_MT_POSITION_Y,
    + cyapa->max_abs_y / cyapa->physical_size_y);
    +
    + if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK)
    + __set_bit(BTN_LEFT, input->keybit);
    + if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK)
    + __set_bit(BTN_MIDDLE, input->keybit);
    + if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK)
    + __set_bit(BTN_RIGHT, input->keybit);
    + if (cyapa->btn_capability == CAPABILITY_LEFT_BTN_MASK)
    + __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
    +
    + /* 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) {
    + dev_err(dev, "allocate memory for MT slots failed, %d\n", ret);
    + goto err_free_device;
    + }
    +
    + /* Register the device in input subsystem */
    + ret = input_register_device(input);
    + if (ret) {
    + dev_err(dev, "input device register failed, %d\n", ret);
    + goto err_free_device;
    + }
    + return 0;
    +
    +err_free_device:
    + input_free_device(input);
    + cyapa->input = NULL;
    + return ret;
    +}
    +
    +static int cyapa_probe(struct i2c_client *client,
    + const struct i2c_device_id *dev_id)
    +{
    + int ret;
    + struct cyapa *cyapa;
    + struct device *dev = &client->dev;
    +
    + 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);
    +
    + cyapa->state = CYAPA_STATE_NO_DEVICE;
    + ret = cyapa_check_is_operational(cyapa);
    + if (ret) {
    + dev_err(dev, "device not operational, %d\n", ret);
    + goto err_mem_free;
    + }
    +
    + ret = cyapa_create_input_dev(cyapa);
    + if (ret) {
    + dev_err(dev, "create input_dev instance failed, %d\n", ret);
    + goto err_mem_free;
    + }
    +
    + 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;
    + }
    +
    + cyapa->irq = client->irq;
    + ret = request_threaded_irq(cyapa->irq,
    + NULL,
    + cyapa_irq,
    + IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
    + "cyapa",
    + cyapa);
    + if (ret) {
    + dev_err(dev, "IRQ request failed: %d\n, ", ret);
    + goto err_unregister_device;
    + }
    +
    + return 0;
    +
    +err_unregister_device:
    + input_unregister_device(cyapa->input);
    +err_mem_free:
    + kfree(cyapa);
    +
    + return ret;
    +}
    +
    +static int cyapa_remove(struct i2c_client *client)
    +{
    + struct cyapa *cyapa = i2c_get_clientdata(client);
    +
    + free_irq(cyapa->irq, cyapa);
    + input_unregister_device(cyapa->input);
    + cyapa_set_power_mode(cyapa, PWR_MODE_OFF);
    + kfree(cyapa);
    +
    + return 0;
    +}
    +
    +#ifdef CONFIG_PM_SLEEP
    +static int cyapa_suspend(struct device *dev)
    +{
    + int ret;
    + u8 power_mode;
    + struct cyapa *cyapa = dev_get_drvdata(dev);
    +
    + disable_irq(cyapa->irq);
    +
    + /*
    + * Set trackpad device to idle mode if wakeup is allowed,
    + * otherwise turn off.
    + */
    + power_mode = device_may_wakeup(dev) ? PWR_MODE_IDLE
    + : PWR_MODE_OFF;
    + ret = cyapa_set_power_mode(cyapa, power_mode);
    + if (ret < 0)
    + dev_err(dev, "set power mode failed, %d\n", ret);
    +
    + if (device_may_wakeup(dev))
    + cyapa->irq_wake = (enable_irq_wake(cyapa->irq) == 0);
    + return 0;
    +}
    +
    +static int cyapa_resume(struct device *dev)
    +{
    + int ret;
    + struct cyapa *cyapa = dev_get_drvdata(dev);
    +
    + if (device_may_wakeup(dev) && cyapa->irq_wake)
    + disable_irq_wake(cyapa->irq);
    +
    + ret = cyapa_set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE);
    + if (ret)
    + dev_warn(dev, "resume active power failed, %d\n", ret);
    +
    + enable_irq(cyapa->irq);
    + return 0;
    +}
    +#endif /* CONFIG_PM_SLEEP */
    +
    +static SIMPLE_DEV_PM_OPS(cyapa_pm_ops, cyapa_suspend, cyapa_resume);
    +
    +static const struct i2c_device_id cyapa_id_table[] = {
    + { "cyapa", 0 },
    + { },
    +};
    +MODULE_DEVICE_TABLE(i2c, cyapa_id_table);
    +
    +static struct i2c_driver cyapa_driver = {
    + .driver = {
    + .name = "cyapa",
    + .owner = THIS_MODULE,
    + .pm = &cyapa_pm_ops,
    + },
    +
    + .probe = cyapa_probe,
    + .remove = cyapa_remove,
    + .id_table = cyapa_id_table,
    +};
    +
    +module_i2c_driver(cyapa_driver);
    +
    +MODULE_DESCRIPTION("Cypress APA I2C Trackpad Driver");
    +MODULE_AUTHOR("Dudley Du <dudl@cypress.com>");
    +MODULE_LICENSE("GPL");
    --
    1.7.7.3


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      Last update: 2012-12-08 00:41    [W:0.081 / U:120.956 seconds]
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