/* * Cypress APA trackpad with I2C interface * * Author: Dudley Du * Further cleanup and restructuring by: * Daniel Kurtz * Benson Leung * * Copyright (C) 2011-2014 Cypress Semiconductor, Inc. * Copyright (C) 2011-2012 Google, Inc. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive for * more details. */ #include #include #include #include #include #include #include /* 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 */ 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 } }; 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, 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); } /* * 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) { u8 status[BL_STATUS_SIZE]; int error; 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. * */ error = 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 && (error == -ETIMEDOUT || error == -ENXIO)) error = cyapa_read_block(cyapa, CYAPA_CMD_BL_STATUS, status); if (error != 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: error = -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 (error < 0) ? error : -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 error; int tries = timeout / 100; error = cyapa_get_state(cyapa); while ((error || cyapa->state >= CYAPA_STATE_BL_BUSY) && tries--) { msleep(100); error = cyapa_get_state(cyapa); } return (error == -EAGAIN || error == -ETIMEDOUT) ? -ETIMEDOUT : error; } static int cyapa_bl_deactivate(struct cyapa *cyapa) { int error; error = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_deactivate), bl_deactivate); if (error) return error; /* wait for bootloader to switch to idle state; should take < 100ms */ msleep(100); error = cyapa_poll_state(cyapa, 500); if (error) return error; 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 error; error = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_exit), bl_exit); if (error) return error; /* * 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. */ error = cyapa_poll_state(cyapa, 2000); if (error < 0) return error; 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; } return 0; } 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 error; error = cyapa_poll_state(cyapa, 2000); if (error) return error; switch (cyapa->state) { case CYAPA_STATE_BL_ACTIVE: error = cyapa_bl_deactivate(cyapa); if (error) return error; /* Fallthrough state */ case CYAPA_STATE_BL_IDLE: error = cyapa_bl_exit(cyapa); if (error) return error; /* Fallthrough state */ case CYAPA_STATE_OP: error = cyapa_get_query_data(cyapa); if (error) return error; /* 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); out: return IRQ_HANDLED; } static u8 cyapa_check_adapter_functionality(struct i2c_client *client) { u8 ret = CYAPA_ADAPTER_FUNC_NONE; if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) ret |= CYAPA_ADAPTER_FUNC_I2C; if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) ret |= CYAPA_ADAPTER_FUNC_SMBUS; return ret; } static int cyapa_open(struct input_dev *input) { struct cyapa *cyapa = input_get_drvdata(input); struct i2c_client *client = cyapa->client; int error; error = cyapa_set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE); if (error) { dev_err(&client->dev, "set active power failed: %d\n", error); return error; } enable_irq(client->irq); return 0; } static void cyapa_close(struct input_dev *input) { struct cyapa *cyapa = input_get_drvdata(input); disable_irq(cyapa->client->irq); cyapa_set_power_mode(cyapa, PWR_MODE_OFF); } static int cyapa_create_input_dev(struct cyapa *cyapa) { struct device *dev = &cyapa->client->dev; struct input_dev *input; int error; if (!cyapa->physical_size_x || !cyapa->physical_size_y) return -EINVAL; input = devm_input_allocate_device(dev); if (!input) { dev_err(dev, "failed to allocate memory for input device.\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->open = cyapa_open; input->close = cyapa_close; 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 */ error = input_mt_init_slots(input, CYAPA_MAX_MT_SLOTS, INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED); if (error) { dev_err(dev, "failed to initialize MT slots: %d\n", error); return error; } cyapa->input = input; return 0; } static int cyapa_probe(struct i2c_client *client, const struct i2c_device_id *dev_id) { struct device *dev = &client->dev; struct cyapa *cyapa; u8 adapter_func; int error; adapter_func = cyapa_check_adapter_functionality(client); if (adapter_func == CYAPA_ADAPTER_FUNC_NONE) { dev_err(dev, "not a supported I2C/SMBus adapter\n"); return -EIO; } cyapa = devm_kzalloc(dev, sizeof(struct cyapa), GFP_KERNEL); if (!cyapa) 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; error = cyapa_check_is_operational(cyapa); if (error) { dev_err(dev, "device not operational, %d\n", error); return error; } /* Power down the device until we need it */ error = cyapa_set_power_mode(cyapa, PWR_MODE_OFF); if (error) { dev_err(dev, "failed to quiesce the device: %d\n", error); return error; } error = cyapa_create_input_dev(cyapa); if (error) return error; error = devm_request_threaded_irq(dev, client->irq, NULL, cyapa_irq, IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "cyapa", cyapa); if (error) { dev_err(dev, "failed to request threaded irq: %d\n", error); return error; } /* Disable IRQ until the device is opened */ disable_irq(client->irq); /* Register the device in input subsystem */ error = input_register_device(cyapa->input); if (error) { dev_err(dev, "failed to register input device: %d\n", error); return error; } return 0; } static int __maybe_unused cyapa_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct cyapa *cyapa = i2c_get_clientdata(client); struct input_dev *input = cyapa->input; u8 power_mode; int error; error = mutex_lock_interruptible(&input->mutex); if (error) return error; disable_irq(client->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; error = cyapa_set_power_mode(cyapa, power_mode); if (error) dev_err(dev, "resume: set power mode to %d failed: %d\n", power_mode, error); if (device_may_wakeup(dev)) cyapa->irq_wake = (enable_irq_wake(client->irq) == 0); mutex_unlock(&input->mutex); return 0; } static int __maybe_unused cyapa_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct cyapa *cyapa = i2c_get_clientdata(client); struct input_dev *input = cyapa->input; u8 power_mode; int error; mutex_lock(&input->mutex); if (device_may_wakeup(dev) && cyapa->irq_wake) disable_irq_wake(client->irq); power_mode = input->users ? PWR_MODE_FULL_ACTIVE : PWR_MODE_OFF; error = cyapa_set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE); if (error) dev_warn(dev, "resume: set power mode to %d failed: %d\n", power_mode, error); enable_irq(client->irq); mutex_unlock(&input->mutex); return 0; } 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, .id_table = cyapa_id_table, }; module_i2c_driver(cyapa_driver); MODULE_DESCRIPTION("Cypress APA I2C Trackpad Driver"); MODULE_AUTHOR("Dudley Du "); MODULE_LICENSE("GPL");