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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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