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Diffstat (limited to '')
| -rw-r--r-- | drivers/input/mouse/cyapa_gen3.c | 807 |
1 files changed, 807 insertions, 0 deletions
diff --git a/drivers/input/mouse/cyapa_gen3.c b/drivers/input/mouse/cyapa_gen3.c new file mode 100644 index 000000000000..1b62c7d585a2 --- /dev/null +++ b/drivers/input/mouse/cyapa_gen3.c @@ -0,0 +1,807 @@ +/* + * 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) 2011-2014 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 <linux/delay.h> +#include <linux/i2c.h> +#include <linux/input.h> +#include <linux/input/mt.h> +#include <linux/module.h> +#include <linux/slab.h> +#include "cyapa.h" + + +#define GEN3_MAX_FINGERS 5 +#define GEN3_FINGER_NUM(x) (((x) >> 4) & 0x07) + +#define BLK_HEAD_BYTES 32 + +/* Macro for register map group offset. */ +#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 CYAPA_OFFSET_SOFT_RESET REG_OFFSET_COMMAND_BASE +#define OP_RECALIBRATION_MASK 0x80 +#define OP_REPORT_BASELINE_MASK 0x40 +#define REG_OFFSET_MAX_BASELINE 0x0026 +#define REG_OFFSET_MIN_BASELINE 0x0027 + +#define REG_OFFSET_POWER_MODE (REG_OFFSET_COMMAND_BASE + 1) +#define SET_POWER_MODE_DELAY 10000 /* Unit: us */ +#define SET_POWER_MODE_TRIES 5 + +#define GEN3_BL_CMD_CHECKSUM_SEED 0xff +#define GEN3_BL_CMD_INITIATE_BL 0x38 +#define GEN3_BL_CMD_WRITE_BLOCK 0x39 +#define GEN3_BL_CMD_VERIFY_BLOCK 0x3a +#define GEN3_BL_CMD_TERMINATE_BL 0x3b +#define GEN3_BL_CMD_LAUNCH_APP 0xa5 + +/* + * 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 + +#define CYAPA_FW_BLOCK_SIZE 64 +#define CYAPA_FW_READ_SIZE 16 +#define CYAPA_FW_HDR_START 0x0780 +#define CYAPA_FW_HDR_BLOCK_COUNT 2 +#define CYAPA_FW_HDR_BLOCK_START (CYAPA_FW_HDR_START / CYAPA_FW_BLOCK_SIZE) +#define CYAPA_FW_HDR_SIZE (CYAPA_FW_HDR_BLOCK_COUNT * \ + CYAPA_FW_BLOCK_SIZE) +#define CYAPA_FW_DATA_START 0x0800 +#define CYAPA_FW_DATA_BLOCK_COUNT 480 +#define CYAPA_FW_DATA_BLOCK_START (CYAPA_FW_DATA_START / CYAPA_FW_BLOCK_SIZE) +#define CYAPA_FW_DATA_SIZE (CYAPA_FW_DATA_BLOCK_COUNT * \ + CYAPA_FW_BLOCK_SIZE) +#define CYAPA_FW_SIZE (CYAPA_FW_HDR_SIZE + CYAPA_FW_DATA_SIZE) +#define CYAPA_CMD_LEN 16 + +#define GEN3_BL_IDLE_FW_MAJ_VER_OFFSET 0x0b +#define GEN3_BL_IDLE_FW_MIN_VER_OFFSET (GEN3_BL_IDLE_FW_MAJ_VER_OFFSET + 1) + + +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; + +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; + +static const u8 bl_activate[] = { 0x00, 0xff, 0x38, 0x00, 0x01, 0x02, 0x03, + 0x04, 0x05, 0x06, 0x07 }; +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 }; + + + /* for byte read/write command */ +#define CMD_RESET 0 +#define CMD_POWER_MODE 1 +#define CMD_DEV_STATUS 2 +#define CMD_REPORT_MAX_BASELINE 3 +#define CMD_REPORT_MIN_BASELINE 4 +#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) +#define CYAPA_SMBUS_MAX_BASELINE SMBUS_BYTE_CMD(CMD_REPORT_MAX_BASELINE) +#define CYAPA_SMBUS_MIN_BASELINE SMBUS_BYTE_CMD(CMD_REPORT_MIN_BASELINE) + + /* 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) + + /* for byte read/write command */ +#define CMD_RESET 0 +#define CMD_POWER_MODE 1 +#define CMD_DEV_STATUS 2 +#define CMD_REPORT_MAX_BASELINE 3 +#define CMD_REPORT_MIN_BASELINE 4 +#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) +#define CYAPA_SMBUS_MAX_BASELINE SMBUS_BYTE_CMD(CMD_REPORT_MAX_BASELINE) +#define CYAPA_SMBUS_MIN_BASELINE SMBUS_BYTE_CMD(CMD_REPORT_MIN_BASELINE) + + /* 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) + +struct cyapa_cmd_len { + u8 cmd; + u8 len; +}; + +/* maps generic CYAPA_CMD_* code to the I2C equivalent */ +static const struct cyapa_cmd_len cyapa_i2c_cmds[] = { + { CYAPA_OFFSET_SOFT_RESET, 1 }, /* CYAPA_CMD_SOFT_RESET */ + { REG_OFFSET_COMMAND_BASE + 1, 1 }, /* CYAPA_CMD_POWER_MODE */ + { REG_OFFSET_DATA_BASE, 1 }, /* CYAPA_CMD_DEV_STATUS */ + { REG_OFFSET_DATA_BASE, sizeof(struct cyapa_reg_data) }, + /* CYAPA_CMD_GROUP_DATA */ + { REG_OFFSET_COMMAND_BASE, 0 }, /* CYAPA_CMD_GROUP_CMD */ + { REG_OFFSET_QUERY_BASE, QUERY_DATA_SIZE }, /* CYAPA_CMD_GROUP_QUERY */ + { BL_HEAD_OFFSET, 3 }, /* CYAPA_CMD_BL_STATUS */ + { BL_HEAD_OFFSET, 16 }, /* CYAPA_CMD_BL_HEAD */ + { BL_HEAD_OFFSET, 16 }, /* CYAPA_CMD_BL_CMD */ + { BL_DATA_OFFSET, 16 }, /* CYAPA_CMD_BL_DATA */ + { BL_HEAD_OFFSET, 32 }, /* CYAPA_CMD_BL_ALL */ + { REG_OFFSET_QUERY_BASE, PRODUCT_ID_SIZE }, + /* CYAPA_CMD_BLK_PRODUCT_ID */ + { REG_OFFSET_DATA_BASE, 32 }, /* CYAPA_CMD_BLK_HEAD */ + { REG_OFFSET_MAX_BASELINE, 1 }, /* CYAPA_CMD_MAX_BASELINE */ + { REG_OFFSET_MIN_BASELINE, 1 }, /* CYAPA_CMD_MIN_BASELINE */ +}; + +static const struct cyapa_cmd_len cyapa_smbus_cmds[] = { + { CYAPA_SMBUS_RESET, 1 }, /* CYAPA_CMD_SOFT_RESET */ + { CYAPA_SMBUS_POWER_MODE, 1 }, /* CYAPA_CMD_POWER_MODE */ + { CYAPA_SMBUS_DEV_STATUS, 1 }, /* CYAPA_CMD_DEV_STATUS */ + { CYAPA_SMBUS_GROUP_DATA, sizeof(struct cyapa_reg_data) }, + /* CYAPA_CMD_GROUP_DATA */ + { CYAPA_SMBUS_GROUP_CMD, 2 }, /* CYAPA_CMD_GROUP_CMD */ + { CYAPA_SMBUS_GROUP_QUERY, QUERY_DATA_SIZE }, + /* CYAPA_CMD_GROUP_QUERY */ + { CYAPA_SMBUS_BL_STATUS, 3 }, /* CYAPA_CMD_BL_STATUS */ + { CYAPA_SMBUS_BL_HEAD, 16 }, /* CYAPA_CMD_BL_HEAD */ + { CYAPA_SMBUS_BL_CMD, 16 }, /* CYAPA_CMD_BL_CMD */ + { CYAPA_SMBUS_BL_DATA, 16 }, /* CYAPA_CMD_BL_DATA */ + { CYAPA_SMBUS_BL_ALL, 32 }, /* CYAPA_CMD_BL_ALL */ + { CYAPA_SMBUS_BLK_PRODUCT_ID, PRODUCT_ID_SIZE }, + /* CYAPA_CMD_BLK_PRODUCT_ID */ + { CYAPA_SMBUS_BLK_HEAD, 16 }, /* CYAPA_CMD_BLK_HEAD */ + { CYAPA_SMBUS_MAX_BASELINE, 1 }, /* CYAPA_CMD_MAX_BASELINE */ + { CYAPA_SMBUS_MIN_BASELINE, 1 }, /* CYAPA_CMD_MIN_BASELINE */ +}; + + +/* + * 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. + */ +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); +} + +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); +} + +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); + } + cmd = cyapa_i2c_cmds[cmd_idx].cmd; + len = cyapa_i2c_cmds[cmd_idx].len; + return cyapa_i2c_reg_read_block(cyapa, cmd, len, values); +} + +/* + * Determine the Gen3 trackpad device's current operating state. + * + */ +static int cyapa_gen3_state_parse(struct cyapa *cyapa, u8 *reg_data, int len) +{ + cyapa->state = CYAPA_STATE_NO_DEVICE; + + /* Parse based on Gen3 characteristic registers and bits */ + if (reg_data[REG_BL_FILE] == BL_FILE && + reg_data[REG_BL_ERROR] == BL_ERROR_NO_ERR_IDLE && + (reg_data[REG_BL_STATUS] == + (BL_STATUS_RUNNING | BL_STATUS_CSUM_VALID) || + reg_data[REG_BL_STATUS] == BL_STATUS_RUNNING)) { + /* + * Normal state after power on or reset, + * REG_BL_STATUS == 0x11, firmware image checksum is valid. + * REG_BL_STATUS == 0x10, firmware image checksum is invalid. + */ + cyapa->gen = CYAPA_GEN3; + cyapa->state = CYAPA_STATE_BL_IDLE; + } else if (reg_data[REG_BL_FILE] == BL_FILE && + (reg_data[REG_BL_STATUS] & BL_STATUS_RUNNING) == + BL_STATUS_RUNNING) { + cyapa->gen = CYAPA_GEN3; + if (reg_data[REG_BL_STATUS] & BL_STATUS_BUSY) { + cyapa->state = CYAPA_STATE_BL_BUSY; + } else { + if ((reg_data[REG_BL_ERROR] & BL_ERROR_BOOTLOADING) == + BL_ERROR_BOOTLOADING) + cyapa->state = CYAPA_STATE_BL_ACTIVE; + else + cyapa->state = CYAPA_STATE_BL_IDLE; + } + } else if ((reg_data[REG_OP_STATUS] & OP_STATUS_SRC) && + (reg_data[REG_OP_DATA1] & OP_DATA_VALID)) { + /* + * Normal state when running in operational mode, + * may also not in full power state or + * busying in command process. + */ + if (GEN3_FINGER_NUM(reg_data[REG_OP_DATA1]) <= + GEN3_MAX_FINGERS) { + /* Finger number data is valid. */ + cyapa->gen = CYAPA_GEN3; + cyapa->state = CYAPA_STATE_OP; + } + } else if (reg_data[REG_OP_STATUS] == 0x0C && + reg_data[REG_OP_DATA1] == 0x08) { + /* Op state when first two registers overwritten with 0x00 */ + cyapa->gen = CYAPA_GEN3; + cyapa->state = CYAPA_STATE_OP; + } else if (reg_data[REG_BL_STATUS] & + (BL_STATUS_RUNNING | BL_STATUS_BUSY)) { + cyapa->gen = CYAPA_GEN3; + cyapa->state = CYAPA_STATE_BL_BUSY; + } + + if (cyapa->gen == CYAPA_GEN3 && (cyapa->state == CYAPA_STATE_OP || + cyapa->state == CYAPA_STATE_BL_IDLE || + cyapa->state == CYAPA_STATE_BL_ACTIVE || + cyapa->state == CYAPA_STATE_BL_BUSY)) + return 0; + + return -EAGAIN; +} + +static int cyapa_gen3_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_gen3_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. If the device power is + * running low, this may take even longer. + */ + error = cyapa_poll_state(cyapa, 4000); + if (error < 0) + return error; + if (cyapa->state != CYAPA_STATE_OP) + return -EAGAIN; + + return 0; +} + +/* + * cyapa_get_wait_time_for_pwr_cmd + * + * Compute the amount of time we need to wait after updating the touchpad + * power mode. The touchpad needs to consume the incoming power mode set + * command at the current clock rate. + */ + +static u16 cyapa_get_wait_time_for_pwr_cmd(u8 pwr_mode) +{ + switch (pwr_mode) { + case PWR_MODE_FULL_ACTIVE: return 20; + case PWR_MODE_BTN_ONLY: return 20; + case PWR_MODE_OFF: return 20; + default: return cyapa_pwr_cmd_to_sleep_time(pwr_mode) + 50; + } +} + +/* + * Set device power mode + * + * Write to the field to configure power state. Power states include : + * Full : Max scans and report rate. + * Idle : Report rate set by user specified time. + * ButtonOnly : No scans for fingers. When the button is triggered, + * a slave interrupt is asserted to notify host to wake up. + * Off : Only awake for i2c commands from host. No function for button + * or touch sensors. + * + * The power_mode command should conform to the following : + * Full : 0x3f + * Idle : Configurable from 20 to 1000ms. See note below for + * cyapa_sleep_time_to_pwr_cmd and cyapa_pwr_cmd_to_sleep_time + * ButtonOnly : 0x01 + * Off : 0x00 + * + * Device power mode can only be set when device is in operational mode. + */ +static int cyapa_gen3_set_power_mode(struct cyapa *cyapa, u8 power_mode, + u16 always_unused) +{ + int ret; + u8 power; + int tries; + u16 sleep_time; + + always_unused = 0; + if (cyapa->state != CYAPA_STATE_OP) + return 0; + + tries = SET_POWER_MODE_TRIES; + while (tries--) { + ret = cyapa_read_byte(cyapa, CYAPA_CMD_POWER_MODE); + if (ret >= 0) + break; + usleep_range(SET_POWER_MODE_DELAY, 2 * SET_POWER_MODE_DELAY); + } + if (ret < 0) + return ret; + + /* + * Return early if the power mode to set is the same as the current + * one. + */ + if ((ret & PWR_MODE_MASK) == power_mode) + return 0; + + sleep_time = cyapa_get_wait_time_for_pwr_cmd(ret & PWR_MODE_MASK); + power = ret; + power &= ~PWR_MODE_MASK; + power |= power_mode & PWR_MODE_MASK; + tries = SET_POWER_MODE_TRIES; + while (tries--) { + ret = cyapa_write_byte(cyapa, CYAPA_CMD_POWER_MODE, power); + if (!ret) + break; + usleep_range(SET_POWER_MODE_DELAY, 2 * SET_POWER_MODE_DELAY); + } + + /* + * Wait for the newly set power command to go in at the previous + * clock speed (scanrate) used by the touchpad firmware. Not + * doing so before issuing the next command may result in errors + * depending on the command's content. + */ + msleep(sleep_time); + return ret; +} + +static int cyapa_gen3_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 != QUERY_DATA_SIZE) + return (ret < 0) ? ret : -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->fw_maj_ver = query_data[15]; + cyapa->fw_min_ver = query_data[16]; + + 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]; + + cyapa->max_z = 255; + + return 0; +} + +static int cyapa_gen3_bl_query_data(struct cyapa *cyapa) +{ + u8 bl_data[CYAPA_CMD_LEN]; + int ret; + + ret = cyapa_i2c_reg_read_block(cyapa, 0, CYAPA_CMD_LEN, bl_data); + if (ret != CYAPA_CMD_LEN) + return (ret < 0) ? ret : -EIO; + + /* + * This value will be updated again when entered application mode. + * If TP failed to enter application mode, this fw version values + * can be used as a reference. + * This firmware version valid when fw image checksum is valid. + */ + if (bl_data[REG_BL_STATUS] == + (BL_STATUS_RUNNING | BL_STATUS_CSUM_VALID)) { + cyapa->fw_maj_ver = bl_data[GEN3_BL_IDLE_FW_MAJ_VER_OFFSET]; + cyapa->fw_min_ver = bl_data[GEN3_BL_IDLE_FW_MIN_VER_OFFSET]; + } + + 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_gen3_do_operational_check(struct cyapa *cyapa) +{ + struct device *dev = &cyapa->client->dev; + int error; + + switch (cyapa->state) { + case CYAPA_STATE_BL_ACTIVE: + error = cyapa_gen3_bl_deactivate(cyapa); + if (error) { + dev_err(dev, "failed to bl_deactivate: %d\n", error); + return error; + } + + /* Fallthrough state */ + case CYAPA_STATE_BL_IDLE: + /* Try to get firmware version in bootloader mode. */ + cyapa_gen3_bl_query_data(cyapa); + + error = cyapa_gen3_bl_exit(cyapa); + if (error) { + dev_err(dev, "failed to bl_exit: %d\n", error); + return error; + } + + /* Fallthrough state */ + case CYAPA_STATE_OP: + /* + * Reading query data before going back to the full mode + * may cause problems, so we set the power mode first here. + */ + error = cyapa_gen3_set_power_mode(cyapa, + PWR_MODE_FULL_ACTIVE, 0); + if (error) + dev_err(dev, "%s: set full power mode failed: %d\n", + __func__, error); + error = cyapa_gen3_get_query_data(cyapa); + if (error < 0) + 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, product_id, + strlen(product_id)) != 0) { + dev_err(dev, "unsupported product ID (%s)\n", + cyapa->product_id); + return -EINVAL; + } + + return 0; + + default: + return -EIO; + } + return 0; +} + +/* + * Return false, do not continue process + * Return true, continue process. + */ +static bool cyapa_gen3_irq_cmd_handler(struct cyapa *cyapa) +{ + /* Not gen3 irq command response, skip for continue. */ + if (cyapa->gen != CYAPA_GEN3) + return true; + + if (cyapa->operational) + return true; + + /* + * Driver in detecting or other interface function processing, + * so, stop cyapa_gen3_irq_handler to continue process to + * avoid unwanted to error detecting and processing. + * + * And also, avoid the periodicly accerted interrupts to be processed + * as touch inputs when gen3 failed to launch into application mode, + * which will cause gen3 stays in bootloader mode. + */ + return false; +} + +static int cyapa_gen3_irq_handler(struct cyapa *cyapa) +{ + struct input_dev *input = cyapa->input; + struct device *dev = &cyapa->client->dev; + struct cyapa_reg_data data; + int num_fingers; + int ret; + int i; + + ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_DATA, (u8 *)&data); + if (ret != sizeof(data)) { + dev_err(dev, "failed to read report data, (%d)\n", ret); + return -EINVAL; + } + + 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) { + dev_err(dev, "invalid device state bytes, %02x %02x\n", + data.device_status, data.finger_btn); + return -EINVAL; + } + + 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); + + return 0; +} + +static int cyapa_gen3_initialize(struct cyapa *cyapa) { return 0; } +static int cyapa_gen3_empty_output_data(struct cyapa *cyapa, + u8 *buf, int *len, cb_sort func) { return 0; } + +const struct cyapa_dev_ops cyapa_gen3_ops = { + .initialize = cyapa_gen3_initialize, + + .state_parse = cyapa_gen3_state_parse, + .operational_check = cyapa_gen3_do_operational_check, + + .irq_handler = cyapa_gen3_irq_handler, + .irq_cmd_handler = cyapa_gen3_irq_cmd_handler, + .sort_empty_output_data = cyapa_gen3_empty_output_data, + .set_power_mode = cyapa_gen3_set_power_mode, +}; 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