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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Elan I2C/SMBus Touchpad driver - I2C interface
0004  *
0005  * Copyright (c) 2013 ELAN Microelectronics Corp.
0006  *
0007  * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
0008  *
0009  * Based on cyapa driver:
0010  * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
0011  * copyright (c) 2011-2012 Google, Inc.
0012  *
0013  * Trademarks are the property of their respective owners.
0014  */
0015 
0016 #include <linux/completion.h>
0017 #include <linux/delay.h>
0018 #include <linux/i2c.h>
0019 #include <linux/interrupt.h>
0020 #include <linux/jiffies.h>
0021 #include <linux/kernel.h>
0022 #include <linux/slab.h>
0023 #include <linux/sched.h>
0024 #include <asm/unaligned.h>
0025 
0026 #include "elan_i2c.h"
0027 
0028 /* Elan i2c commands */
0029 #define ETP_I2C_RESET           0x0100
0030 #define ETP_I2C_WAKE_UP         0x0800
0031 #define ETP_I2C_SLEEP           0x0801
0032 #define ETP_I2C_DESC_CMD        0x0001
0033 #define ETP_I2C_REPORT_DESC_CMD     0x0002
0034 #define ETP_I2C_STAND_CMD       0x0005
0035 #define ETP_I2C_PATTERN_CMD     0x0100
0036 #define ETP_I2C_UNIQUEID_CMD        0x0101
0037 #define ETP_I2C_FW_VERSION_CMD      0x0102
0038 #define ETP_I2C_IC_TYPE_CMD     0x0103
0039 #define ETP_I2C_OSM_VERSION_CMD     0x0103
0040 #define ETP_I2C_NSM_VERSION_CMD     0x0104
0041 #define ETP_I2C_XY_TRACENUM_CMD     0x0105
0042 #define ETP_I2C_MAX_X_AXIS_CMD      0x0106
0043 #define ETP_I2C_MAX_Y_AXIS_CMD      0x0107
0044 #define ETP_I2C_RESOLUTION_CMD      0x0108
0045 #define ETP_I2C_PRESSURE_CMD        0x010A
0046 #define ETP_I2C_IAP_VERSION_CMD     0x0110
0047 #define ETP_I2C_IC_TYPE_P0_CMD      0x0110
0048 #define ETP_I2C_IAP_VERSION_P0_CMD  0x0111
0049 #define ETP_I2C_SET_CMD         0x0300
0050 #define ETP_I2C_POWER_CMD       0x0307
0051 #define ETP_I2C_FW_CHECKSUM_CMD     0x030F
0052 #define ETP_I2C_IAP_CTRL_CMD        0x0310
0053 #define ETP_I2C_IAP_CMD         0x0311
0054 #define ETP_I2C_IAP_RESET_CMD       0x0314
0055 #define ETP_I2C_IAP_CHECKSUM_CMD    0x0315
0056 #define ETP_I2C_CALIBRATE_CMD       0x0316
0057 #define ETP_I2C_MAX_BASELINE_CMD    0x0317
0058 #define ETP_I2C_MIN_BASELINE_CMD    0x0318
0059 #define ETP_I2C_IAP_TYPE_REG        0x0040
0060 #define ETP_I2C_IAP_TYPE_CMD        0x0304
0061 
0062 #define ETP_I2C_REPORT_LEN      34
0063 #define ETP_I2C_REPORT_LEN_ID2      39
0064 #define ETP_I2C_REPORT_MAX_LEN      39
0065 #define ETP_I2C_DESC_LENGTH     30
0066 #define ETP_I2C_REPORT_DESC_LENGTH  158
0067 #define ETP_I2C_INF_LENGTH      2
0068 #define ETP_I2C_IAP_PASSWORD        0x1EA5
0069 #define ETP_I2C_IAP_RESET       0xF0F0
0070 #define ETP_I2C_MAIN_MODE_ON        (1 << 9)
0071 #define ETP_I2C_IAP_REG_L       0x01
0072 #define ETP_I2C_IAP_REG_H       0x06
0073 
0074 static int elan_i2c_read_block(struct i2c_client *client,
0075                    u16 reg, u8 *val, u16 len)
0076 {
0077     __le16 buf[] = {
0078         cpu_to_le16(reg),
0079     };
0080     struct i2c_msg msgs[] = {
0081         {
0082             .addr = client->addr,
0083             .flags = client->flags & I2C_M_TEN,
0084             .len = sizeof(buf),
0085             .buf = (u8 *)buf,
0086         },
0087         {
0088             .addr = client->addr,
0089             .flags = (client->flags & I2C_M_TEN) | I2C_M_RD,
0090             .len = len,
0091             .buf = val,
0092         }
0093     };
0094     int ret;
0095 
0096     ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
0097     return ret == ARRAY_SIZE(msgs) ? 0 : (ret < 0 ? ret : -EIO);
0098 }
0099 
0100 static int elan_i2c_read_cmd(struct i2c_client *client, u16 reg, u8 *val)
0101 {
0102     int retval;
0103 
0104     retval = elan_i2c_read_block(client, reg, val, ETP_I2C_INF_LENGTH);
0105     if (retval < 0) {
0106         dev_err(&client->dev, "reading cmd (0x%04x) fail.\n", reg);
0107         return retval;
0108     }
0109 
0110     return 0;
0111 }
0112 
0113 static int elan_i2c_write_cmd(struct i2c_client *client, u16 reg, u16 cmd)
0114 {
0115     __le16 buf[] = {
0116         cpu_to_le16(reg),
0117         cpu_to_le16(cmd),
0118     };
0119     struct i2c_msg msg = {
0120         .addr = client->addr,
0121         .flags = client->flags & I2C_M_TEN,
0122         .len = sizeof(buf),
0123         .buf = (u8 *)buf,
0124     };
0125     int ret;
0126 
0127     ret = i2c_transfer(client->adapter, &msg, 1);
0128     if (ret != 1) {
0129         if (ret >= 0)
0130             ret = -EIO;
0131         dev_err(&client->dev, "writing cmd (0x%04x) failed: %d\n",
0132             reg, ret);
0133         return ret;
0134     }
0135 
0136     return 0;
0137 }
0138 
0139 static int elan_i2c_initialize(struct i2c_client *client)
0140 {
0141     struct device *dev = &client->dev;
0142     int error;
0143     u8 val[256];
0144 
0145     error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET);
0146     if (error) {
0147         dev_err(dev, "device reset failed: %d\n", error);
0148         return error;
0149     }
0150 
0151     /* Wait for the device to reset */
0152     msleep(100);
0153 
0154     /* get reset acknowledgement 0000 */
0155     error = i2c_master_recv(client, val, ETP_I2C_INF_LENGTH);
0156     if (error < 0) {
0157         dev_err(dev, "failed to read reset response: %d\n", error);
0158         return error;
0159     }
0160 
0161     error = elan_i2c_read_block(client, ETP_I2C_DESC_CMD,
0162                     val, ETP_I2C_DESC_LENGTH);
0163     if (error) {
0164         dev_err(dev, "cannot get device descriptor: %d\n", error);
0165         return error;
0166     }
0167 
0168     error = elan_i2c_read_block(client, ETP_I2C_REPORT_DESC_CMD,
0169                     val, ETP_I2C_REPORT_DESC_LENGTH);
0170     if (error) {
0171         dev_err(dev, "fetching report descriptor failed.: %d\n", error);
0172         return error;
0173     }
0174 
0175     return 0;
0176 }
0177 
0178 static int elan_i2c_sleep_control(struct i2c_client *client, bool sleep)
0179 {
0180     return elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD,
0181                   sleep ? ETP_I2C_SLEEP : ETP_I2C_WAKE_UP);
0182 }
0183 
0184 static int elan_i2c_power_control(struct i2c_client *client, bool enable)
0185 {
0186     u8 val[2];
0187     u16 reg;
0188     int error;
0189 
0190     error = elan_i2c_read_cmd(client, ETP_I2C_POWER_CMD, val);
0191     if (error) {
0192         dev_err(&client->dev,
0193             "failed to read current power state: %d\n",
0194             error);
0195         return error;
0196     }
0197 
0198     reg = le16_to_cpup((__le16 *)val);
0199     if (enable)
0200         reg &= ~ETP_DISABLE_POWER;
0201     else
0202         reg |= ETP_DISABLE_POWER;
0203 
0204     error = elan_i2c_write_cmd(client, ETP_I2C_POWER_CMD, reg);
0205     if (error) {
0206         dev_err(&client->dev,
0207             "failed to write current power state: %d\n",
0208             error);
0209         return error;
0210     }
0211 
0212     return 0;
0213 }
0214 
0215 static int elan_i2c_set_mode(struct i2c_client *client, u8 mode)
0216 {
0217     return elan_i2c_write_cmd(client, ETP_I2C_SET_CMD, mode);
0218 }
0219 
0220 
0221 static int elan_i2c_calibrate(struct i2c_client *client)
0222 {
0223     return elan_i2c_write_cmd(client, ETP_I2C_CALIBRATE_CMD, 1);
0224 }
0225 
0226 static int elan_i2c_calibrate_result(struct i2c_client *client, u8 *val)
0227 {
0228     return elan_i2c_read_block(client, ETP_I2C_CALIBRATE_CMD, val, 1);
0229 }
0230 
0231 static int elan_i2c_get_baseline_data(struct i2c_client *client,
0232                       bool max_baseline, u8 *value)
0233 {
0234     int error;
0235     u8 val[3];
0236 
0237     error = elan_i2c_read_cmd(client,
0238                   max_baseline ? ETP_I2C_MAX_BASELINE_CMD :
0239                          ETP_I2C_MIN_BASELINE_CMD,
0240                   val);
0241     if (error)
0242         return error;
0243 
0244     *value = le16_to_cpup((__le16 *)val);
0245 
0246     return 0;
0247 }
0248 
0249 static int elan_i2c_get_pattern(struct i2c_client *client, u8 *pattern)
0250 {
0251     int error;
0252     u8 val[3];
0253 
0254     error = elan_i2c_read_cmd(client, ETP_I2C_PATTERN_CMD, val);
0255     if (error) {
0256         dev_err(&client->dev, "failed to get pattern: %d\n", error);
0257         return error;
0258     }
0259 
0260     /*
0261      * Not all versions of firmware implement "get pattern" command.
0262      * When this command is not implemented the device will respond
0263      * with 0xFF 0xFF, which we will treat as "old" pattern 0.
0264      */
0265     *pattern = val[0] == 0xFF && val[1] == 0xFF ? 0 : val[1];
0266 
0267     return 0;
0268 }
0269 
0270 static int elan_i2c_get_version(struct i2c_client *client,
0271                 u8 pattern, bool iap, u8 *version)
0272 {
0273     int error;
0274     u16 cmd;
0275     u8 val[3];
0276 
0277     if (!iap)
0278         cmd = ETP_I2C_FW_VERSION_CMD;
0279     else if (pattern == 0)
0280         cmd = ETP_I2C_IAP_VERSION_P0_CMD;
0281     else
0282         cmd = ETP_I2C_IAP_VERSION_CMD;
0283 
0284     error = elan_i2c_read_cmd(client, cmd, val);
0285     if (error) {
0286         dev_err(&client->dev, "failed to get %s version: %d\n",
0287             iap ? "IAP" : "FW", error);
0288         return error;
0289     }
0290 
0291     if (pattern >= 0x01)
0292         *version = iap ? val[1] : val[0];
0293     else
0294         *version = val[0];
0295     return 0;
0296 }
0297 
0298 static int elan_i2c_get_sm_version(struct i2c_client *client, u8 pattern,
0299                    u16 *ic_type, u8 *version, u8 *clickpad)
0300 {
0301     int error;
0302     u8 val[3];
0303 
0304     if (pattern >= 0x01) {
0305         error = elan_i2c_read_cmd(client, ETP_I2C_IC_TYPE_CMD, val);
0306         if (error) {
0307             dev_err(&client->dev, "failed to get ic type: %d\n",
0308                 error);
0309             return error;
0310         }
0311         *ic_type = be16_to_cpup((__be16 *)val);
0312 
0313         error = elan_i2c_read_cmd(client, ETP_I2C_NSM_VERSION_CMD,
0314                       val);
0315         if (error) {
0316             dev_err(&client->dev, "failed to get SM version: %d\n",
0317                 error);
0318             return error;
0319         }
0320         *version = val[1];
0321         *clickpad = val[0] & 0x10;
0322     } else {
0323         error = elan_i2c_read_cmd(client, ETP_I2C_OSM_VERSION_CMD, val);
0324         if (error) {
0325             dev_err(&client->dev, "failed to get SM version: %d\n",
0326                 error);
0327             return error;
0328         }
0329         *version = val[0];
0330 
0331         error = elan_i2c_read_cmd(client, ETP_I2C_IC_TYPE_P0_CMD, val);
0332         if (error) {
0333             dev_err(&client->dev, "failed to get ic type: %d\n",
0334                 error);
0335             return error;
0336         }
0337         *ic_type = val[0];
0338 
0339         error = elan_i2c_read_cmd(client, ETP_I2C_NSM_VERSION_CMD,
0340                       val);
0341         if (error) {
0342             dev_err(&client->dev, "failed to get SM version: %d\n",
0343                 error);
0344             return error;
0345         }
0346         *clickpad = val[0] & 0x10;
0347     }
0348 
0349     return 0;
0350 }
0351 
0352 static int elan_i2c_get_product_id(struct i2c_client *client, u16 *id)
0353 {
0354     int error;
0355     u8 val[3];
0356 
0357     error = elan_i2c_read_cmd(client, ETP_I2C_UNIQUEID_CMD, val);
0358     if (error) {
0359         dev_err(&client->dev, "failed to get product ID: %d\n", error);
0360         return error;
0361     }
0362 
0363     *id = le16_to_cpup((__le16 *)val);
0364     return 0;
0365 }
0366 
0367 static int elan_i2c_get_checksum(struct i2c_client *client,
0368                  bool iap, u16 *csum)
0369 {
0370     int error;
0371     u8 val[3];
0372 
0373     error = elan_i2c_read_cmd(client,
0374                   iap ? ETP_I2C_IAP_CHECKSUM_CMD :
0375                     ETP_I2C_FW_CHECKSUM_CMD,
0376                   val);
0377     if (error) {
0378         dev_err(&client->dev, "failed to get %s checksum: %d\n",
0379             iap ? "IAP" : "FW", error);
0380         return error;
0381     }
0382 
0383     *csum = le16_to_cpup((__le16 *)val);
0384     return 0;
0385 }
0386 
0387 static int elan_i2c_get_max(struct i2c_client *client,
0388                 unsigned int *max_x, unsigned int *max_y)
0389 {
0390     int error;
0391     u8 val[3];
0392 
0393     error = elan_i2c_read_cmd(client, ETP_I2C_MAX_X_AXIS_CMD, val);
0394     if (error) {
0395         dev_err(&client->dev, "failed to get X dimension: %d\n", error);
0396         return error;
0397     }
0398 
0399     *max_x = le16_to_cpup((__le16 *)val);
0400 
0401     error = elan_i2c_read_cmd(client, ETP_I2C_MAX_Y_AXIS_CMD, val);
0402     if (error) {
0403         dev_err(&client->dev, "failed to get Y dimension: %d\n", error);
0404         return error;
0405     }
0406 
0407     *max_y = le16_to_cpup((__le16 *)val);
0408 
0409     return 0;
0410 }
0411 
0412 static int elan_i2c_get_resolution(struct i2c_client *client,
0413                    u8 *hw_res_x, u8 *hw_res_y)
0414 {
0415     int error;
0416     u8 val[3];
0417 
0418     error = elan_i2c_read_cmd(client, ETP_I2C_RESOLUTION_CMD, val);
0419     if (error) {
0420         dev_err(&client->dev, "failed to get resolution: %d\n", error);
0421         return error;
0422     }
0423 
0424     *hw_res_x = val[0];
0425     *hw_res_y = val[1];
0426 
0427     return 0;
0428 }
0429 
0430 static int elan_i2c_get_num_traces(struct i2c_client *client,
0431                    unsigned int *x_traces,
0432                    unsigned int *y_traces)
0433 {
0434     int error;
0435     u8 val[3];
0436 
0437     error = elan_i2c_read_cmd(client, ETP_I2C_XY_TRACENUM_CMD, val);
0438     if (error) {
0439         dev_err(&client->dev, "failed to get trace info: %d\n", error);
0440         return error;
0441     }
0442 
0443     *x_traces = val[0];
0444     *y_traces = val[1];
0445 
0446     return 0;
0447 }
0448 
0449 static int elan_i2c_get_pressure_adjustment(struct i2c_client *client,
0450                         int *adjustment)
0451 {
0452     int error;
0453     u8 val[3];
0454 
0455     error = elan_i2c_read_cmd(client, ETP_I2C_PRESSURE_CMD, val);
0456     if (error) {
0457         dev_err(&client->dev, "failed to get pressure format: %d\n",
0458             error);
0459         return error;
0460     }
0461 
0462     if ((val[0] >> 4) & 0x1)
0463         *adjustment = 0;
0464     else
0465         *adjustment = ETP_PRESSURE_OFFSET;
0466 
0467     return 0;
0468 }
0469 
0470 static int elan_i2c_iap_get_mode(struct i2c_client *client, enum tp_mode *mode)
0471 {
0472     int error;
0473     u16 constant;
0474     u8 val[3];
0475 
0476     error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
0477     if (error) {
0478         dev_err(&client->dev,
0479             "failed to read iap control register: %d\n",
0480             error);
0481         return error;
0482     }
0483 
0484     constant = le16_to_cpup((__le16 *)val);
0485     dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant);
0486 
0487     *mode = (constant & ETP_I2C_MAIN_MODE_ON) ? MAIN_MODE : IAP_MODE;
0488 
0489     return 0;
0490 }
0491 
0492 static int elan_i2c_iap_reset(struct i2c_client *client)
0493 {
0494     int error;
0495 
0496     error = elan_i2c_write_cmd(client, ETP_I2C_IAP_RESET_CMD,
0497                    ETP_I2C_IAP_RESET);
0498     if (error) {
0499         dev_err(&client->dev, "cannot reset IC: %d\n", error);
0500         return error;
0501     }
0502 
0503     return 0;
0504 }
0505 
0506 static int elan_i2c_set_flash_key(struct i2c_client *client)
0507 {
0508     int error;
0509 
0510     error = elan_i2c_write_cmd(client, ETP_I2C_IAP_CMD,
0511                    ETP_I2C_IAP_PASSWORD);
0512     if (error) {
0513         dev_err(&client->dev, "cannot set flash key: %d\n", error);
0514         return error;
0515     }
0516 
0517     return 0;
0518 }
0519 
0520 static int elan_read_write_iap_type(struct i2c_client *client, u16 fw_page_size)
0521 {
0522     int error;
0523     u16 constant;
0524     u8 val[3];
0525     int retry = 3;
0526 
0527     do {
0528         error = elan_i2c_write_cmd(client, ETP_I2C_IAP_TYPE_CMD,
0529                        fw_page_size / 2);
0530         if (error) {
0531             dev_err(&client->dev,
0532                 "cannot write iap type: %d\n", error);
0533             return error;
0534         }
0535 
0536         error = elan_i2c_read_cmd(client, ETP_I2C_IAP_TYPE_CMD, val);
0537         if (error) {
0538             dev_err(&client->dev,
0539                 "failed to read iap type register: %d\n",
0540                 error);
0541             return error;
0542         }
0543         constant = le16_to_cpup((__le16 *)val);
0544         dev_dbg(&client->dev, "iap type reg: 0x%04x\n", constant);
0545 
0546         if (constant == fw_page_size / 2)
0547             return 0;
0548 
0549     } while (--retry > 0);
0550 
0551     dev_err(&client->dev, "cannot set iap type\n");
0552     return -EIO;
0553 }
0554 
0555 static int elan_i2c_prepare_fw_update(struct i2c_client *client, u16 ic_type,
0556                       u8 iap_version, u16 fw_page_size)
0557 {
0558     struct device *dev = &client->dev;
0559     int error;
0560     enum tp_mode mode;
0561     u8 val[3];
0562     u16 password;
0563 
0564     /* Get FW in which mode (IAP_MODE/MAIN_MODE)  */
0565     error = elan_i2c_iap_get_mode(client, &mode);
0566     if (error)
0567         return error;
0568 
0569     if (mode == IAP_MODE) {
0570         /* Reset IC */
0571         error = elan_i2c_iap_reset(client);
0572         if (error)
0573             return error;
0574 
0575         msleep(30);
0576     }
0577 
0578     /* Set flash key*/
0579     error = elan_i2c_set_flash_key(client);
0580     if (error)
0581         return error;
0582 
0583     /* Wait for F/W IAP initialization */
0584     msleep(mode == MAIN_MODE ? 100 : 30);
0585 
0586     /* Check if we are in IAP mode or not */
0587     error = elan_i2c_iap_get_mode(client, &mode);
0588     if (error)
0589         return error;
0590 
0591     if (mode == MAIN_MODE) {
0592         dev_err(dev, "wrong mode: %d\n", mode);
0593         return -EIO;
0594     }
0595 
0596     if (ic_type >= 0x0D && iap_version >= 1) {
0597         error = elan_read_write_iap_type(client, fw_page_size);
0598         if (error)
0599             return error;
0600     }
0601 
0602     /* Set flash key again */
0603     error = elan_i2c_set_flash_key(client);
0604     if (error)
0605         return error;
0606 
0607     /* Wait for F/W IAP initialization */
0608     msleep(30);
0609 
0610     /* read back to check we actually enabled successfully. */
0611     error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CMD, val);
0612     if (error) {
0613         dev_err(dev, "cannot read iap password: %d\n",
0614             error);
0615         return error;
0616     }
0617 
0618     password = le16_to_cpup((__le16 *)val);
0619     if (password != ETP_I2C_IAP_PASSWORD) {
0620         dev_err(dev, "wrong iap password: 0x%X\n", password);
0621         return -EIO;
0622     }
0623 
0624     return 0;
0625 }
0626 
0627 static int elan_i2c_write_fw_block(struct i2c_client *client, u16 fw_page_size,
0628                    const u8 *page, u16 checksum, int idx)
0629 {
0630     struct device *dev = &client->dev;
0631     u8 *page_store;
0632     u8 val[3];
0633     u16 result;
0634     int ret, error;
0635 
0636     page_store = kmalloc(fw_page_size + 4, GFP_KERNEL);
0637     if (!page_store)
0638         return -ENOMEM;
0639 
0640     page_store[0] = ETP_I2C_IAP_REG_L;
0641     page_store[1] = ETP_I2C_IAP_REG_H;
0642     memcpy(&page_store[2], page, fw_page_size);
0643     /* recode checksum at last two bytes */
0644     put_unaligned_le16(checksum, &page_store[fw_page_size + 2]);
0645 
0646     ret = i2c_master_send(client, page_store, fw_page_size + 4);
0647     if (ret != fw_page_size + 4) {
0648         error = ret < 0 ? ret : -EIO;
0649         dev_err(dev, "Failed to write page %d: %d\n", idx, error);
0650         goto exit;
0651     }
0652 
0653     /* Wait for F/W to update one page ROM data. */
0654     msleep(fw_page_size == ETP_FW_PAGE_SIZE_512 ? 50 : 35);
0655 
0656     error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
0657     if (error) {
0658         dev_err(dev, "Failed to read IAP write result: %d\n", error);
0659         goto exit;
0660     }
0661 
0662     result = le16_to_cpup((__le16 *)val);
0663     if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) {
0664         dev_err(dev, "IAP reports failed write: %04hx\n",
0665             result);
0666         error = -EIO;
0667         goto exit;
0668     }
0669 
0670 exit:
0671     kfree(page_store);
0672     return error;
0673 }
0674 
0675 static int elan_i2c_finish_fw_update(struct i2c_client *client,
0676                      struct completion *completion)
0677 {
0678     struct device *dev = &client->dev;
0679     int error = 0;
0680     int len;
0681     u8 buffer[ETP_I2C_REPORT_MAX_LEN];
0682 
0683     len = i2c_master_recv(client, buffer, ETP_I2C_REPORT_MAX_LEN);
0684     if (len <= 0) {
0685         error = len < 0 ? len : -EIO;
0686         dev_warn(dev, "failed to read I2C data after FW WDT reset: %d (%d)\n",
0687             error, len);
0688     }
0689 
0690     reinit_completion(completion);
0691     enable_irq(client->irq);
0692 
0693     error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET);
0694     if (error) {
0695         dev_err(dev, "device reset failed: %d\n", error);
0696     } else if (!wait_for_completion_timeout(completion,
0697                         msecs_to_jiffies(300))) {
0698         dev_err(dev, "timeout waiting for device reset\n");
0699         error = -ETIMEDOUT;
0700     }
0701 
0702     disable_irq(client->irq);
0703 
0704     if (error)
0705         return error;
0706 
0707     len = i2c_master_recv(client, buffer, ETP_I2C_INF_LENGTH);
0708     if (len != ETP_I2C_INF_LENGTH) {
0709         error = len < 0 ? len : -EIO;
0710         dev_err(dev, "failed to read INT signal: %d (%d)\n",
0711             error, len);
0712         return error;
0713     }
0714 
0715     return 0;
0716 }
0717 
0718 static int elan_i2c_get_report_features(struct i2c_client *client, u8 pattern,
0719                     unsigned int *features,
0720                     unsigned int *report_len)
0721 {
0722     *features = ETP_FEATURE_REPORT_MK;
0723     *report_len = pattern <= 0x01 ?
0724             ETP_I2C_REPORT_LEN : ETP_I2C_REPORT_LEN_ID2;
0725     return 0;
0726 }
0727 
0728 static int elan_i2c_get_report(struct i2c_client *client,
0729                    u8 *report, unsigned int report_len)
0730 {
0731     int len;
0732 
0733     len = i2c_master_recv(client, report, report_len);
0734     if (len < 0) {
0735         dev_err(&client->dev, "failed to read report data: %d\n", len);
0736         return len;
0737     }
0738 
0739     if (len != report_len) {
0740         dev_err(&client->dev,
0741             "wrong report length (%d vs %d expected)\n",
0742             len, report_len);
0743         return -EIO;
0744     }
0745 
0746     return 0;
0747 }
0748 
0749 const struct elan_transport_ops elan_i2c_ops = {
0750     .initialize     = elan_i2c_initialize,
0751     .sleep_control      = elan_i2c_sleep_control,
0752     .power_control      = elan_i2c_power_control,
0753     .set_mode       = elan_i2c_set_mode,
0754 
0755     .calibrate      = elan_i2c_calibrate,
0756     .calibrate_result   = elan_i2c_calibrate_result,
0757 
0758     .get_baseline_data  = elan_i2c_get_baseline_data,
0759 
0760     .get_version        = elan_i2c_get_version,
0761     .get_sm_version     = elan_i2c_get_sm_version,
0762     .get_product_id     = elan_i2c_get_product_id,
0763     .get_checksum       = elan_i2c_get_checksum,
0764     .get_pressure_adjustment = elan_i2c_get_pressure_adjustment,
0765 
0766     .get_max        = elan_i2c_get_max,
0767     .get_resolution     = elan_i2c_get_resolution,
0768     .get_num_traces     = elan_i2c_get_num_traces,
0769 
0770     .iap_get_mode       = elan_i2c_iap_get_mode,
0771     .iap_reset      = elan_i2c_iap_reset,
0772 
0773     .prepare_fw_update  = elan_i2c_prepare_fw_update,
0774     .write_fw_block     = elan_i2c_write_fw_block,
0775     .finish_fw_update   = elan_i2c_finish_fw_update,
0776 
0777     .get_pattern        = elan_i2c_get_pattern,
0778 
0779     .get_report_features    = elan_i2c_get_report_features,
0780     .get_report     = elan_i2c_get_report,
0781 };
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