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Message-ID: <20121208124200.GB3147@polaris.bitmath.org>
Date: Sat, 8 Dec 2012 13:42:00 +0100
From: "Henrik Rydberg" <rydberg@...omail.se>
To: Benson Leung <bleung@...omium.org>
Cc: khali@...ux-fr.org, dmitry.torokhov@...il.com,
linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
djkurtz@...omium.org, olofj@...omium.org, dudl@...ress.com
Subject: Re: [PATCH v3 1/1] Input: add driver for Cypress APA I2C Trackpad
On Fri, Dec 07, 2012 at 03:24:16PM -0800, Benson Leung wrote:
> 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@...ress.com>
> Signed-off-by: Daniel Kurtz <djkurtz@...omium.org>
> Signed-off-by: Benson Leung <bleung@...omium.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@...ress.com>
> + * Further cleanup and restructuring by:
> + * Daniel Kurtz <djkurtz@...omium.org>
> + * Benson Leung <bleung@...omium.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@...ress.com>");
> +MODULE_LICENSE("GPL");
> --
> 1.7.7.3
>
Reviewed-by: Henrik Rydberg <rydberg@...omail.se>
Thanks,
Henrik
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