| /* |
| * Elan I2C/SMBus Touchpad driver - I2C interface |
| * |
| * Copyright (c) 2013 ELAN Microelectronics Corp. |
| * |
| * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw> |
| * |
| * Based on cyapa driver: |
| * copyright (c) 2011-2012 Cypress Semiconductor, Inc. |
| * copyright (c) 2011-2012 Google, Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 as published |
| * by the Free Software Foundation. |
| * |
| * Trademarks are the property of their respective owners. |
| */ |
| |
| #include <linux/completion.h> |
| #include <linux/delay.h> |
| #include <linux/i2c.h> |
| #include <linux/interrupt.h> |
| #include <linux/jiffies.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <asm/unaligned.h> |
| |
| #include "elan_i2c.h" |
| |
| /* Elan i2c commands */ |
| #define ETP_I2C_RESET 0x0100 |
| #define ETP_I2C_WAKE_UP 0x0800 |
| #define ETP_I2C_SLEEP 0x0801 |
| #define ETP_I2C_DESC_CMD 0x0001 |
| #define ETP_I2C_REPORT_DESC_CMD 0x0002 |
| #define ETP_I2C_STAND_CMD 0x0005 |
| #define ETP_I2C_UNIQUEID_CMD 0x0101 |
| #define ETP_I2C_FW_VERSION_CMD 0x0102 |
| #define ETP_I2C_SM_VERSION_CMD 0x0103 |
| #define ETP_I2C_XY_TRACENUM_CMD 0x0105 |
| #define ETP_I2C_MAX_X_AXIS_CMD 0x0106 |
| #define ETP_I2C_MAX_Y_AXIS_CMD 0x0107 |
| #define ETP_I2C_RESOLUTION_CMD 0x0108 |
| #define ETP_I2C_IAP_VERSION_CMD 0x0110 |
| #define ETP_I2C_SET_CMD 0x0300 |
| #define ETP_I2C_POWER_CMD 0x0307 |
| #define ETP_I2C_FW_CHECKSUM_CMD 0x030F |
| #define ETP_I2C_IAP_CTRL_CMD 0x0310 |
| #define ETP_I2C_IAP_CMD 0x0311 |
| #define ETP_I2C_IAP_RESET_CMD 0x0314 |
| #define ETP_I2C_IAP_CHECKSUM_CMD 0x0315 |
| #define ETP_I2C_CALIBRATE_CMD 0x0316 |
| #define ETP_I2C_MAX_BASELINE_CMD 0x0317 |
| #define ETP_I2C_MIN_BASELINE_CMD 0x0318 |
| |
| #define ETP_I2C_REPORT_LEN 34 |
| #define ETP_I2C_DESC_LENGTH 30 |
| #define ETP_I2C_REPORT_DESC_LENGTH 158 |
| #define ETP_I2C_INF_LENGTH 2 |
| #define ETP_I2C_IAP_PASSWORD 0x1EA5 |
| #define ETP_I2C_IAP_RESET 0xF0F0 |
| #define ETP_I2C_MAIN_MODE_ON (1 << 9) |
| #define ETP_I2C_IAP_REG_L 0x01 |
| #define ETP_I2C_IAP_REG_H 0x06 |
| |
| static int elan_i2c_read_block(struct i2c_client *client, |
| u16 reg, u8 *val, u16 len) |
| { |
| __le16 buf[] = { |
| cpu_to_le16(reg), |
| }; |
| struct i2c_msg msgs[] = { |
| { |
| .addr = client->addr, |
| .flags = client->flags & I2C_M_TEN, |
| .len = sizeof(buf), |
| .buf = (u8 *)buf, |
| }, |
| { |
| .addr = client->addr, |
| .flags = (client->flags & I2C_M_TEN) | I2C_M_RD, |
| .len = len, |
| .buf = val, |
| } |
| }; |
| int ret; |
| |
| ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); |
| return ret == ARRAY_SIZE(msgs) ? 0 : (ret < 0 ? ret : -EIO); |
| } |
| |
| static int elan_i2c_read_cmd(struct i2c_client *client, u16 reg, u8 *val) |
| { |
| int retval; |
| |
| retval = elan_i2c_read_block(client, reg, val, ETP_I2C_INF_LENGTH); |
| if (retval < 0) { |
| dev_err(&client->dev, "reading cmd (0x%04x) fail.\n", reg); |
| return retval; |
| } |
| |
| return 0; |
| } |
| |
| static int elan_i2c_write_cmd(struct i2c_client *client, u16 reg, u16 cmd) |
| { |
| __le16 buf[] = { |
| cpu_to_le16(reg), |
| cpu_to_le16(cmd), |
| }; |
| struct i2c_msg msg = { |
| .addr = client->addr, |
| .flags = client->flags & I2C_M_TEN, |
| .len = sizeof(buf), |
| .buf = (u8 *)buf, |
| }; |
| int ret; |
| |
| ret = i2c_transfer(client->adapter, &msg, 1); |
| return ret == 1 ? 0 : (ret < 0 ? ret : -EIO); |
| } |
| |
| static int elan_i2c_initialize(struct i2c_client *client) |
| { |
| struct device *dev = &client->dev; |
| int error; |
| u8 val[256]; |
| |
| error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET); |
| if (error) { |
| dev_err(dev, "device reset failed: %d\n", error); |
| return error; |
| } |
| |
| /* Wait for the device to reset */ |
| msleep(100); |
| |
| /* get reset acknowledgement 0000 */ |
| error = i2c_master_recv(client, val, ETP_I2C_INF_LENGTH); |
| if (error < 0) { |
| dev_err(dev, "failed to read reset response: %d\n", error); |
| return error; |
| } |
| |
| error = elan_i2c_read_block(client, ETP_I2C_DESC_CMD, |
| val, ETP_I2C_DESC_LENGTH); |
| if (error) { |
| dev_err(dev, "cannot get device descriptor: %d\n", error); |
| return error; |
| } |
| |
| error = elan_i2c_read_block(client, ETP_I2C_REPORT_DESC_CMD, |
| val, ETP_I2C_REPORT_DESC_LENGTH); |
| if (error) { |
| dev_err(dev, "fetching report descriptor failed.: %d\n", error); |
| return error; |
| } |
| |
| return 0; |
| } |
| |
| static int elan_i2c_sleep_control(struct i2c_client *client, bool sleep) |
| { |
| return elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, |
| sleep ? ETP_I2C_SLEEP : ETP_I2C_WAKE_UP); |
| } |
| |
| static int elan_i2c_power_control(struct i2c_client *client, bool enable) |
| { |
| u8 val[2]; |
| u16 reg; |
| int error; |
| |
| error = elan_i2c_read_cmd(client, ETP_I2C_POWER_CMD, val); |
| if (error) { |
| dev_err(&client->dev, |
| "failed to read current power state: %d\n", |
| error); |
| return error; |
| } |
| |
| reg = le16_to_cpup((__le16 *)val); |
| if (enable) |
| reg &= ~ETP_DISABLE_POWER; |
| else |
| reg |= ETP_DISABLE_POWER; |
| |
| error = elan_i2c_write_cmd(client, ETP_I2C_POWER_CMD, reg); |
| if (error) { |
| dev_err(&client->dev, |
| "failed to write current power state: %d\n", |
| error); |
| return error; |
| } |
| |
| return 0; |
| } |
| |
| static int elan_i2c_set_mode(struct i2c_client *client, u8 mode) |
| { |
| return elan_i2c_write_cmd(client, ETP_I2C_SET_CMD, mode); |
| } |
| |
| |
| static int elan_i2c_calibrate(struct i2c_client *client) |
| { |
| return elan_i2c_write_cmd(client, ETP_I2C_CALIBRATE_CMD, 1); |
| } |
| |
| static int elan_i2c_calibrate_result(struct i2c_client *client, u8 *val) |
| { |
| return elan_i2c_read_block(client, ETP_I2C_CALIBRATE_CMD, val, 1); |
| } |
| |
| static int elan_i2c_get_baseline_data(struct i2c_client *client, |
| bool max_baseline, u8 *value) |
| { |
| int error; |
| u8 val[3]; |
| |
| error = elan_i2c_read_cmd(client, |
| max_baseline ? ETP_I2C_MAX_BASELINE_CMD : |
| ETP_I2C_MIN_BASELINE_CMD, |
| val); |
| if (error) |
| return error; |
| |
| *value = le16_to_cpup((__le16 *)val); |
| |
| return 0; |
| } |
| |
| static int elan_i2c_get_version(struct i2c_client *client, |
| bool iap, u8 *version) |
| { |
| int error; |
| u8 val[3]; |
| |
| error = elan_i2c_read_cmd(client, |
| iap ? ETP_I2C_IAP_VERSION_CMD : |
| ETP_I2C_FW_VERSION_CMD, |
| val); |
| if (error) { |
| dev_err(&client->dev, "failed to get %s version: %d\n", |
| iap ? "IAP" : "FW", error); |
| return error; |
| } |
| |
| *version = val[0]; |
| return 0; |
| } |
| |
| static int elan_i2c_get_sm_version(struct i2c_client *client, u8 *version) |
| { |
| int error; |
| u8 val[3]; |
| |
| error = elan_i2c_read_cmd(client, ETP_I2C_SM_VERSION_CMD, val); |
| if (error) { |
| dev_err(&client->dev, "failed to get SM version: %d\n", error); |
| return error; |
| } |
| |
| *version = val[0]; |
| return 0; |
| } |
| |
| static int elan_i2c_get_product_id(struct i2c_client *client, u8 *id) |
| { |
| int error; |
| u8 val[3]; |
| |
| error = elan_i2c_read_cmd(client, ETP_I2C_UNIQUEID_CMD, val); |
| if (error) { |
| dev_err(&client->dev, "failed to get product ID: %d\n", error); |
| return error; |
| } |
| |
| *id = val[0]; |
| return 0; |
| } |
| |
| static int elan_i2c_get_checksum(struct i2c_client *client, |
| bool iap, u16 *csum) |
| { |
| int error; |
| u8 val[3]; |
| |
| error = elan_i2c_read_cmd(client, |
| iap ? ETP_I2C_IAP_CHECKSUM_CMD : |
| ETP_I2C_FW_CHECKSUM_CMD, |
| val); |
| if (error) { |
| dev_err(&client->dev, "failed to get %s checksum: %d\n", |
| iap ? "IAP" : "FW", error); |
| return error; |
| } |
| |
| *csum = le16_to_cpup((__le16 *)val); |
| return 0; |
| } |
| |
| static int elan_i2c_get_max(struct i2c_client *client, |
| unsigned int *max_x, unsigned int *max_y) |
| { |
| int error; |
| u8 val[3]; |
| |
| error = elan_i2c_read_cmd(client, ETP_I2C_MAX_X_AXIS_CMD, val); |
| if (error) { |
| dev_err(&client->dev, "failed to get X dimension: %d\n", error); |
| return error; |
| } |
| |
| *max_x = le16_to_cpup((__le16 *)val) & 0x0fff; |
| |
| error = elan_i2c_read_cmd(client, ETP_I2C_MAX_Y_AXIS_CMD, val); |
| if (error) { |
| dev_err(&client->dev, "failed to get Y dimension: %d\n", error); |
| return error; |
| } |
| |
| *max_y = le16_to_cpup((__le16 *)val) & 0x0fff; |
| |
| return 0; |
| } |
| |
| static int elan_i2c_get_resolution(struct i2c_client *client, |
| u8 *hw_res_x, u8 *hw_res_y) |
| { |
| int error; |
| u8 val[3]; |
| |
| error = elan_i2c_read_cmd(client, ETP_I2C_RESOLUTION_CMD, val); |
| if (error) { |
| dev_err(&client->dev, "failed to get resolution: %d\n", error); |
| return error; |
| } |
| |
| *hw_res_x = val[0]; |
| *hw_res_y = val[1]; |
| |
| return 0; |
| } |
| |
| static int elan_i2c_get_num_traces(struct i2c_client *client, |
| unsigned int *x_traces, |
| unsigned int *y_traces) |
| { |
| int error; |
| u8 val[3]; |
| |
| error = elan_i2c_read_cmd(client, ETP_I2C_XY_TRACENUM_CMD, val); |
| if (error) { |
| dev_err(&client->dev, "failed to get trace info: %d\n", error); |
| return error; |
| } |
| |
| *x_traces = val[0] - 1; |
| *y_traces = val[1] - 1; |
| |
| return 0; |
| } |
| |
| static int elan_i2c_iap_get_mode(struct i2c_client *client, enum tp_mode *mode) |
| { |
| int error; |
| u16 constant; |
| u8 val[3]; |
| |
| error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val); |
| if (error) { |
| dev_err(&client->dev, |
| "failed to read iap control register: %d\n", |
| error); |
| return error; |
| } |
| |
| constant = le16_to_cpup((__le16 *)val); |
| dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant); |
| |
| *mode = (constant & ETP_I2C_MAIN_MODE_ON) ? MAIN_MODE : IAP_MODE; |
| |
| return 0; |
| } |
| |
| static int elan_i2c_iap_reset(struct i2c_client *client) |
| { |
| int error; |
| |
| error = elan_i2c_write_cmd(client, ETP_I2C_IAP_RESET_CMD, |
| ETP_I2C_IAP_RESET); |
| if (error) { |
| dev_err(&client->dev, "cannot reset IC: %d\n", error); |
| return error; |
| } |
| |
| return 0; |
| } |
| |
| static int elan_i2c_set_flash_key(struct i2c_client *client) |
| { |
| int error; |
| |
| error = elan_i2c_write_cmd(client, ETP_I2C_IAP_CMD, |
| ETP_I2C_IAP_PASSWORD); |
| if (error) { |
| dev_err(&client->dev, "cannot set flash key: %d\n", error); |
| return error; |
| } |
| |
| return 0; |
| } |
| |
| static int elan_i2c_prepare_fw_update(struct i2c_client *client) |
| { |
| struct device *dev = &client->dev; |
| int error; |
| enum tp_mode mode; |
| u8 val[3]; |
| u16 password; |
| |
| /* Get FW in which mode (IAP_MODE/MAIN_MODE) */ |
| error = elan_i2c_iap_get_mode(client, &mode); |
| if (error) |
| return error; |
| |
| if (mode == IAP_MODE) { |
| /* Reset IC */ |
| error = elan_i2c_iap_reset(client); |
| if (error) |
| return error; |
| |
| msleep(30); |
| } |
| |
| /* Set flash key*/ |
| error = elan_i2c_set_flash_key(client); |
| if (error) |
| return error; |
| |
| /* Wait for F/W IAP initialization */ |
| msleep(mode == MAIN_MODE ? 100 : 30); |
| |
| /* Check if we are in IAP mode or not */ |
| error = elan_i2c_iap_get_mode(client, &mode); |
| if (error) |
| return error; |
| |
| if (mode == MAIN_MODE) { |
| dev_err(dev, "wrong mode: %d\n", mode); |
| return -EIO; |
| } |
| |
| /* Set flash key again */ |
| error = elan_i2c_set_flash_key(client); |
| if (error) |
| return error; |
| |
| /* Wait for F/W IAP initialization */ |
| msleep(30); |
| |
| /* read back to check we actually enabled successfully. */ |
| error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CMD, val); |
| if (error) { |
| dev_err(dev, "cannot read iap password: %d\n", |
| error); |
| return error; |
| } |
| |
| password = le16_to_cpup((__le16 *)val); |
| if (password != ETP_I2C_IAP_PASSWORD) { |
| dev_err(dev, "wrong iap password: 0x%X\n", password); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| static int elan_i2c_write_fw_block(struct i2c_client *client, |
| const u8 *page, u16 checksum, int idx) |
| { |
| struct device *dev = &client->dev; |
| u8 page_store[ETP_FW_PAGE_SIZE + 4]; |
| u8 val[3]; |
| u16 result; |
| int ret, error; |
| |
| page_store[0] = ETP_I2C_IAP_REG_L; |
| page_store[1] = ETP_I2C_IAP_REG_H; |
| memcpy(&page_store[2], page, ETP_FW_PAGE_SIZE); |
| /* recode checksum at last two bytes */ |
| put_unaligned_le16(checksum, &page_store[ETP_FW_PAGE_SIZE + 2]); |
| |
| ret = i2c_master_send(client, page_store, sizeof(page_store)); |
| if (ret != sizeof(page_store)) { |
| error = ret < 0 ? ret : -EIO; |
| dev_err(dev, "Failed to write page %d: %d\n", idx, error); |
| return error; |
| } |
| |
| /* Wait for F/W to update one page ROM data. */ |
| msleep(20); |
| |
| error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val); |
| if (error) { |
| dev_err(dev, "Failed to read IAP write result: %d\n", error); |
| return error; |
| } |
| |
| result = le16_to_cpup((__le16 *)val); |
| if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) { |
| dev_err(dev, "IAP reports failed write: %04hx\n", |
| result); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| static int elan_i2c_finish_fw_update(struct i2c_client *client, |
| struct completion *completion) |
| { |
| struct device *dev = &client->dev; |
| long ret; |
| int error; |
| int len; |
| u8 buffer[ETP_I2C_INF_LENGTH]; |
| |
| reinit_completion(completion); |
| enable_irq(client->irq); |
| |
| error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET); |
| if (!error) |
| ret = wait_for_completion_interruptible_timeout(completion, |
| msecs_to_jiffies(300)); |
| disable_irq(client->irq); |
| |
| if (error) { |
| dev_err(dev, "device reset failed: %d\n", error); |
| return error; |
| } else if (ret == 0) { |
| dev_err(dev, "timeout waiting for device reset\n"); |
| return -ETIMEDOUT; |
| } else if (ret < 0) { |
| error = ret; |
| dev_err(dev, "error waiting for device reset: %d\n", error); |
| return error; |
| } |
| |
| len = i2c_master_recv(client, buffer, ETP_I2C_INF_LENGTH); |
| if (len != ETP_I2C_INF_LENGTH) { |
| error = len < 0 ? len : -EIO; |
| dev_err(dev, "failed to read INT signal: %d (%d)\n", |
| error, len); |
| return error; |
| } |
| |
| return 0; |
| } |
| |
| static int elan_i2c_get_report(struct i2c_client *client, u8 *report) |
| { |
| int len; |
| |
| len = i2c_master_recv(client, report, ETP_I2C_REPORT_LEN); |
| if (len < 0) { |
| dev_err(&client->dev, "failed to read report data: %d\n", len); |
| return len; |
| } |
| |
| if (len != ETP_I2C_REPORT_LEN) { |
| dev_err(&client->dev, |
| "wrong report length (%d vs %d expected)\n", |
| len, ETP_I2C_REPORT_LEN); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| const struct elan_transport_ops elan_i2c_ops = { |
| .initialize = elan_i2c_initialize, |
| .sleep_control = elan_i2c_sleep_control, |
| .power_control = elan_i2c_power_control, |
| .set_mode = elan_i2c_set_mode, |
| |
| .calibrate = elan_i2c_calibrate, |
| .calibrate_result = elan_i2c_calibrate_result, |
| |
| .get_baseline_data = elan_i2c_get_baseline_data, |
| |
| .get_version = elan_i2c_get_version, |
| .get_sm_version = elan_i2c_get_sm_version, |
| .get_product_id = elan_i2c_get_product_id, |
| .get_checksum = elan_i2c_get_checksum, |
| |
| .get_max = elan_i2c_get_max, |
| .get_resolution = elan_i2c_get_resolution, |
| .get_num_traces = elan_i2c_get_num_traces, |
| |
| .iap_get_mode = elan_i2c_iap_get_mode, |
| .iap_reset = elan_i2c_iap_reset, |
| |
| .prepare_fw_update = elan_i2c_prepare_fw_update, |
| .write_fw_block = elan_i2c_write_fw_block, |
| .finish_fw_update = elan_i2c_finish_fw_update, |
| |
| .get_report = elan_i2c_get_report, |
| }; |