| /* |
| * Elan I2C/SMBus Touchpad driver |
| * |
| * Copyright (c) 2013 ELAN Microelectronics Corp. |
| * |
| * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw> |
| * Author: KT Liao <kt.liao@emc.com.tw> |
| * Version: 1.6.2 |
| * |
| * 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/acpi.h> |
| #include <linux/delay.h> |
| #include <linux/device.h> |
| #include <linux/firmware.h> |
| #include <linux/i2c.h> |
| #include <linux/init.h> |
| #include <linux/input/mt.h> |
| #include <linux/interrupt.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/input.h> |
| #include <linux/uaccess.h> |
| #include <linux/jiffies.h> |
| #include <linux/completion.h> |
| #include <linux/of.h> |
| #include <linux/regulator/consumer.h> |
| #include <asm/unaligned.h> |
| |
| #include "elan_i2c.h" |
| |
| #define DRIVER_NAME "elan_i2c" |
| #define ELAN_DRIVER_VERSION "1.6.2" |
| #define ELAN_VENDOR_ID 0x04f3 |
| #define ETP_MAX_PRESSURE 255 |
| #define ETP_FWIDTH_REDUCE 90 |
| #define ETP_FINGER_WIDTH 15 |
| #define ETP_RETRY_COUNT 3 |
| |
| #define ETP_MAX_FINGERS 5 |
| #define ETP_FINGER_DATA_LEN 5 |
| #define ETP_REPORT_ID 0x5D |
| #define ETP_REPORT_ID_OFFSET 2 |
| #define ETP_TOUCH_INFO_OFFSET 3 |
| #define ETP_FINGER_DATA_OFFSET 4 |
| #define ETP_HOVER_INFO_OFFSET 30 |
| #define ETP_MAX_REPORT_LEN 34 |
| |
| /* The main device structure */ |
| struct elan_tp_data { |
| struct i2c_client *client; |
| struct input_dev *input; |
| struct regulator *vcc; |
| |
| const struct elan_transport_ops *ops; |
| |
| /* for fw update */ |
| struct completion fw_completion; |
| bool in_fw_update; |
| |
| struct mutex sysfs_mutex; |
| |
| unsigned int max_x; |
| unsigned int max_y; |
| unsigned int width_x; |
| unsigned int width_y; |
| unsigned int x_res; |
| unsigned int y_res; |
| |
| u16 product_id; |
| u8 fw_version; |
| u8 sm_version; |
| u8 iap_version; |
| u16 fw_checksum; |
| int pressure_adjustment; |
| u8 mode; |
| u8 ic_type; |
| u16 fw_validpage_count; |
| u16 fw_signature_address; |
| |
| bool irq_wake; |
| |
| u8 min_baseline; |
| u8 max_baseline; |
| bool baseline_ready; |
| }; |
| |
| static int elan_get_fwinfo(u8 iap_version, u16 *validpage_count, |
| u16 *signature_address) |
| { |
| switch (iap_version) { |
| case 0x00: |
| case 0x06: |
| case 0x08: |
| *validpage_count = 512; |
| break; |
| case 0x03: |
| case 0x07: |
| case 0x09: |
| case 0x0A: |
| case 0x0B: |
| case 0x0C: |
| *validpage_count = 768; |
| break; |
| case 0x0D: |
| *validpage_count = 896; |
| break; |
| case 0x0E: |
| *validpage_count = 640; |
| break; |
| default: |
| /* unknown ic type clear value */ |
| *validpage_count = 0; |
| *signature_address = 0; |
| return -ENXIO; |
| } |
| |
| *signature_address = |
| (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE; |
| |
| return 0; |
| } |
| |
| static int elan_enable_power(struct elan_tp_data *data) |
| { |
| int repeat = ETP_RETRY_COUNT; |
| int error; |
| |
| error = regulator_enable(data->vcc); |
| if (error) { |
| dev_err(&data->client->dev, |
| "failed to enable regulator: %d\n", error); |
| return error; |
| } |
| |
| do { |
| error = data->ops->power_control(data->client, true); |
| if (error >= 0) |
| return 0; |
| |
| msleep(30); |
| } while (--repeat > 0); |
| |
| dev_err(&data->client->dev, "failed to enable power: %d\n", error); |
| return error; |
| } |
| |
| static int elan_disable_power(struct elan_tp_data *data) |
| { |
| int repeat = ETP_RETRY_COUNT; |
| int error; |
| |
| do { |
| error = data->ops->power_control(data->client, false); |
| if (!error) { |
| error = regulator_disable(data->vcc); |
| if (error) { |
| dev_err(&data->client->dev, |
| "failed to disable regulator: %d\n", |
| error); |
| /* Attempt to power the chip back up */ |
| data->ops->power_control(data->client, true); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| msleep(30); |
| } while (--repeat > 0); |
| |
| dev_err(&data->client->dev, "failed to disable power: %d\n", error); |
| return error; |
| } |
| |
| static int elan_sleep(struct elan_tp_data *data) |
| { |
| int repeat = ETP_RETRY_COUNT; |
| int error; |
| |
| do { |
| error = data->ops->sleep_control(data->client, true); |
| if (!error) |
| return 0; |
| |
| msleep(30); |
| } while (--repeat > 0); |
| |
| return error; |
| } |
| |
| static int elan_query_product(struct elan_tp_data *data) |
| { |
| int error; |
| |
| error = data->ops->get_product_id(data->client, &data->product_id); |
| if (error) |
| return error; |
| |
| error = data->ops->get_sm_version(data->client, &data->ic_type, |
| &data->sm_version); |
| if (error) |
| return error; |
| |
| return 0; |
| } |
| |
| static int elan_check_ASUS_special_fw(struct elan_tp_data *data) |
| { |
| if (data->ic_type == 0x0E) { |
| switch (data->product_id) { |
| case 0x05 ... 0x07: |
| case 0x09: |
| case 0x13: |
| return true; |
| } |
| } else if (data->ic_type == 0x08 && data->product_id == 0x26) { |
| /* ASUS EeeBook X205TA */ |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static int __elan_initialize(struct elan_tp_data *data) |
| { |
| struct i2c_client *client = data->client; |
| bool woken_up = false; |
| int error; |
| |
| error = data->ops->initialize(client); |
| if (error) { |
| dev_err(&client->dev, "device initialize failed: %d\n", error); |
| return error; |
| } |
| |
| error = elan_query_product(data); |
| if (error) |
| return error; |
| |
| /* |
| * Some ASUS devices were shipped with firmware that requires |
| * touchpads to be woken up first, before attempting to switch |
| * them into absolute reporting mode. |
| */ |
| if (elan_check_ASUS_special_fw(data)) { |
| error = data->ops->sleep_control(client, false); |
| if (error) { |
| dev_err(&client->dev, |
| "failed to wake device up: %d\n", error); |
| return error; |
| } |
| |
| msleep(200); |
| woken_up = true; |
| } |
| |
| data->mode |= ETP_ENABLE_ABS; |
| error = data->ops->set_mode(client, data->mode); |
| if (error) { |
| dev_err(&client->dev, |
| "failed to switch to absolute mode: %d\n", error); |
| return error; |
| } |
| |
| if (!woken_up) { |
| error = data->ops->sleep_control(client, false); |
| if (error) { |
| dev_err(&client->dev, |
| "failed to wake device up: %d\n", error); |
| return error; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int elan_initialize(struct elan_tp_data *data) |
| { |
| int repeat = ETP_RETRY_COUNT; |
| int error; |
| |
| do { |
| error = __elan_initialize(data); |
| if (!error) |
| return 0; |
| |
| msleep(30); |
| } while (--repeat > 0); |
| |
| return error; |
| } |
| |
| static int elan_query_device_info(struct elan_tp_data *data) |
| { |
| int error; |
| |
| error = data->ops->get_version(data->client, false, &data->fw_version); |
| if (error) |
| return error; |
| |
| error = data->ops->get_checksum(data->client, false, |
| &data->fw_checksum); |
| if (error) |
| return error; |
| |
| error = data->ops->get_version(data->client, true, &data->iap_version); |
| if (error) |
| return error; |
| |
| error = data->ops->get_pressure_adjustment(data->client, |
| &data->pressure_adjustment); |
| if (error) |
| return error; |
| |
| error = elan_get_fwinfo(data->iap_version, &data->fw_validpage_count, |
| &data->fw_signature_address); |
| if (error) |
| dev_warn(&data->client->dev, |
| "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n", |
| data->iap_version, data->ic_type); |
| |
| return 0; |
| } |
| |
| static unsigned int elan_convert_resolution(u8 val) |
| { |
| /* |
| * (value from firmware) * 10 + 790 = dpi |
| * |
| * We also have to convert dpi to dots/mm (*10/254 to avoid floating |
| * point). |
| */ |
| |
| return ((int)(char)val * 10 + 790) * 10 / 254; |
| } |
| |
| static int elan_query_device_parameters(struct elan_tp_data *data) |
| { |
| unsigned int x_traces, y_traces; |
| u8 hw_x_res, hw_y_res; |
| int error; |
| |
| error = data->ops->get_max(data->client, &data->max_x, &data->max_y); |
| if (error) |
| return error; |
| |
| error = data->ops->get_num_traces(data->client, &x_traces, &y_traces); |
| if (error) |
| return error; |
| |
| data->width_x = data->max_x / x_traces; |
| data->width_y = data->max_y / y_traces; |
| |
| error = data->ops->get_resolution(data->client, &hw_x_res, &hw_y_res); |
| if (error) |
| return error; |
| |
| data->x_res = elan_convert_resolution(hw_x_res); |
| data->y_res = elan_convert_resolution(hw_y_res); |
| |
| return 0; |
| } |
| |
| /* |
| ********************************************************** |
| * IAP firmware updater related routines |
| ********************************************************** |
| */ |
| static int elan_write_fw_block(struct elan_tp_data *data, |
| const u8 *page, u16 checksum, int idx) |
| { |
| int retry = ETP_RETRY_COUNT; |
| int error; |
| |
| do { |
| error = data->ops->write_fw_block(data->client, |
| page, checksum, idx); |
| if (!error) |
| return 0; |
| |
| dev_dbg(&data->client->dev, |
| "IAP retrying page %d (error: %d)\n", idx, error); |
| } while (--retry > 0); |
| |
| return error; |
| } |
| |
| static int __elan_update_firmware(struct elan_tp_data *data, |
| const struct firmware *fw) |
| { |
| struct i2c_client *client = data->client; |
| struct device *dev = &client->dev; |
| int i, j; |
| int error; |
| u16 iap_start_addr; |
| u16 boot_page_count; |
| u16 sw_checksum = 0, fw_checksum = 0; |
| |
| error = data->ops->prepare_fw_update(client); |
| if (error) |
| return error; |
| |
| iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]); |
| |
| boot_page_count = (iap_start_addr * 2) / ETP_FW_PAGE_SIZE; |
| for (i = boot_page_count; i < data->fw_validpage_count; i++) { |
| u16 checksum = 0; |
| const u8 *page = &fw->data[i * ETP_FW_PAGE_SIZE]; |
| |
| for (j = 0; j < ETP_FW_PAGE_SIZE; j += 2) |
| checksum += ((page[j + 1] << 8) | page[j]); |
| |
| error = elan_write_fw_block(data, page, checksum, i); |
| if (error) { |
| dev_err(dev, "write page %d fail: %d\n", i, error); |
| return error; |
| } |
| |
| sw_checksum += checksum; |
| } |
| |
| /* Wait WDT reset and power on reset */ |
| msleep(600); |
| |
| error = data->ops->finish_fw_update(client, &data->fw_completion); |
| if (error) |
| return error; |
| |
| error = data->ops->get_checksum(client, true, &fw_checksum); |
| if (error) |
| return error; |
| |
| if (sw_checksum != fw_checksum) { |
| dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n", |
| sw_checksum, fw_checksum); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| static int elan_update_firmware(struct elan_tp_data *data, |
| const struct firmware *fw) |
| { |
| struct i2c_client *client = data->client; |
| int retval; |
| |
| dev_dbg(&client->dev, "Starting firmware update....\n"); |
| |
| disable_irq(client->irq); |
| data->in_fw_update = true; |
| |
| retval = __elan_update_firmware(data, fw); |
| if (retval) { |
| dev_err(&client->dev, "firmware update failed: %d\n", retval); |
| data->ops->iap_reset(client); |
| } else { |
| /* Reinitialize TP after fw is updated */ |
| elan_initialize(data); |
| elan_query_device_info(data); |
| } |
| |
| data->in_fw_update = false; |
| enable_irq(client->irq); |
| |
| return retval; |
| } |
| |
| /* |
| ******************************************************************* |
| * SYSFS attributes |
| ******************************************************************* |
| */ |
| static ssize_t elan_sysfs_read_fw_checksum(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct elan_tp_data *data = i2c_get_clientdata(client); |
| |
| return sprintf(buf, "0x%04x\n", data->fw_checksum); |
| } |
| |
| static ssize_t elan_sysfs_read_product_id(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct elan_tp_data *data = i2c_get_clientdata(client); |
| |
| return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n", |
| data->product_id); |
| } |
| |
| static ssize_t elan_sysfs_read_fw_ver(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct elan_tp_data *data = i2c_get_clientdata(client); |
| |
| return sprintf(buf, "%d.0\n", data->fw_version); |
| } |
| |
| static ssize_t elan_sysfs_read_sm_ver(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct elan_tp_data *data = i2c_get_clientdata(client); |
| |
| return sprintf(buf, "%d.0\n", data->sm_version); |
| } |
| |
| static ssize_t elan_sysfs_read_iap_ver(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct elan_tp_data *data = i2c_get_clientdata(client); |
| |
| return sprintf(buf, "%d.0\n", data->iap_version); |
| } |
| |
| static ssize_t elan_sysfs_update_fw(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct elan_tp_data *data = dev_get_drvdata(dev); |
| const struct firmware *fw; |
| char *fw_name; |
| int error; |
| const u8 *fw_signature; |
| static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF}; |
| |
| if (data->fw_validpage_count == 0) |
| return -EINVAL; |
| |
| /* Look for a firmware with the product id appended. */ |
| fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id); |
| if (!fw_name) { |
| dev_err(dev, "failed to allocate memory for firmware name\n"); |
| return -ENOMEM; |
| } |
| |
| dev_info(dev, "requesting fw '%s'\n", fw_name); |
| error = request_firmware(&fw, fw_name, dev); |
| kfree(fw_name); |
| if (error) { |
| dev_err(dev, "failed to request firmware: %d\n", error); |
| return error; |
| } |
| |
| /* Firmware file must match signature data */ |
| fw_signature = &fw->data[data->fw_signature_address]; |
| if (memcmp(fw_signature, signature, sizeof(signature)) != 0) { |
| dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n", |
| (int)sizeof(signature), signature, |
| (int)sizeof(signature), fw_signature); |
| error = -EBADF; |
| goto out_release_fw; |
| } |
| |
| error = mutex_lock_interruptible(&data->sysfs_mutex); |
| if (error) |
| goto out_release_fw; |
| |
| error = elan_update_firmware(data, fw); |
| |
| mutex_unlock(&data->sysfs_mutex); |
| |
| out_release_fw: |
| release_firmware(fw); |
| return error ?: count; |
| } |
| |
| static ssize_t calibrate_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct elan_tp_data *data = i2c_get_clientdata(client); |
| int tries = 20; |
| int retval; |
| int error; |
| u8 val[3]; |
| |
| retval = mutex_lock_interruptible(&data->sysfs_mutex); |
| if (retval) |
| return retval; |
| |
| disable_irq(client->irq); |
| |
| data->mode |= ETP_ENABLE_CALIBRATE; |
| retval = data->ops->set_mode(client, data->mode); |
| if (retval) { |
| dev_err(dev, "failed to enable calibration mode: %d\n", |
| retval); |
| goto out; |
| } |
| |
| retval = data->ops->calibrate(client); |
| if (retval) { |
| dev_err(dev, "failed to start calibration: %d\n", |
| retval); |
| goto out_disable_calibrate; |
| } |
| |
| val[0] = 0xff; |
| do { |
| /* Wait 250ms before checking if calibration has completed. */ |
| msleep(250); |
| |
| retval = data->ops->calibrate_result(client, val); |
| if (retval) |
| dev_err(dev, "failed to check calibration result: %d\n", |
| retval); |
| else if (val[0] == 0) |
| break; /* calibration done */ |
| |
| } while (--tries); |
| |
| if (tries == 0) { |
| dev_err(dev, "failed to calibrate. Timeout.\n"); |
| retval = -ETIMEDOUT; |
| } |
| |
| out_disable_calibrate: |
| data->mode &= ~ETP_ENABLE_CALIBRATE; |
| error = data->ops->set_mode(data->client, data->mode); |
| if (error) { |
| dev_err(dev, "failed to disable calibration mode: %d\n", |
| error); |
| if (!retval) |
| retval = error; |
| } |
| out: |
| enable_irq(client->irq); |
| mutex_unlock(&data->sysfs_mutex); |
| return retval ?: count; |
| } |
| |
| static ssize_t elan_sysfs_read_mode(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct elan_tp_data *data = i2c_get_clientdata(client); |
| int error; |
| enum tp_mode mode; |
| |
| error = mutex_lock_interruptible(&data->sysfs_mutex); |
| if (error) |
| return error; |
| |
| error = data->ops->iap_get_mode(data->client, &mode); |
| |
| mutex_unlock(&data->sysfs_mutex); |
| |
| if (error) |
| return error; |
| |
| return sprintf(buf, "%d\n", (int)mode); |
| } |
| |
| static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL); |
| static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL); |
| static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL); |
| static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL); |
| static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL); |
| static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL); |
| static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw); |
| |
| static DEVICE_ATTR_WO(calibrate); |
| |
| static struct attribute *elan_sysfs_entries[] = { |
| &dev_attr_product_id.attr, |
| &dev_attr_firmware_version.attr, |
| &dev_attr_sample_version.attr, |
| &dev_attr_iap_version.attr, |
| &dev_attr_fw_checksum.attr, |
| &dev_attr_calibrate.attr, |
| &dev_attr_mode.attr, |
| &dev_attr_update_fw.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group elan_sysfs_group = { |
| .attrs = elan_sysfs_entries, |
| }; |
| |
| static ssize_t acquire_store(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct elan_tp_data *data = i2c_get_clientdata(client); |
| int error; |
| int retval; |
| |
| retval = mutex_lock_interruptible(&data->sysfs_mutex); |
| if (retval) |
| return retval; |
| |
| disable_irq(client->irq); |
| |
| data->baseline_ready = false; |
| |
| data->mode |= ETP_ENABLE_CALIBRATE; |
| retval = data->ops->set_mode(data->client, data->mode); |
| if (retval) { |
| dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n", |
| retval); |
| goto out; |
| } |
| |
| msleep(250); |
| |
| retval = data->ops->get_baseline_data(data->client, true, |
| &data->max_baseline); |
| if (retval) { |
| dev_err(dev, "Failed to read max baseline form device: %d\n", |
| retval); |
| goto out_disable_calibrate; |
| } |
| |
| retval = data->ops->get_baseline_data(data->client, false, |
| &data->min_baseline); |
| if (retval) { |
| dev_err(dev, "Failed to read min baseline form device: %d\n", |
| retval); |
| goto out_disable_calibrate; |
| } |
| |
| data->baseline_ready = true; |
| |
| out_disable_calibrate: |
| data->mode &= ~ETP_ENABLE_CALIBRATE; |
| error = data->ops->set_mode(data->client, data->mode); |
| if (error) { |
| dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n", |
| error); |
| if (!retval) |
| retval = error; |
| } |
| out: |
| enable_irq(client->irq); |
| mutex_unlock(&data->sysfs_mutex); |
| return retval ?: count; |
| } |
| |
| static ssize_t min_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct elan_tp_data *data = i2c_get_clientdata(client); |
| int retval; |
| |
| retval = mutex_lock_interruptible(&data->sysfs_mutex); |
| if (retval) |
| return retval; |
| |
| if (!data->baseline_ready) { |
| retval = -ENODATA; |
| goto out; |
| } |
| |
| retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline); |
| |
| out: |
| mutex_unlock(&data->sysfs_mutex); |
| return retval; |
| } |
| |
| static ssize_t max_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct elan_tp_data *data = i2c_get_clientdata(client); |
| int retval; |
| |
| retval = mutex_lock_interruptible(&data->sysfs_mutex); |
| if (retval) |
| return retval; |
| |
| if (!data->baseline_ready) { |
| retval = -ENODATA; |
| goto out; |
| } |
| |
| retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline); |
| |
| out: |
| mutex_unlock(&data->sysfs_mutex); |
| return retval; |
| } |
| |
| |
| static DEVICE_ATTR_WO(acquire); |
| static DEVICE_ATTR_RO(min); |
| static DEVICE_ATTR_RO(max); |
| |
| static struct attribute *elan_baseline_sysfs_entries[] = { |
| &dev_attr_acquire.attr, |
| &dev_attr_min.attr, |
| &dev_attr_max.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group elan_baseline_sysfs_group = { |
| .name = "baseline", |
| .attrs = elan_baseline_sysfs_entries, |
| }; |
| |
| static const struct attribute_group *elan_sysfs_groups[] = { |
| &elan_sysfs_group, |
| &elan_baseline_sysfs_group, |
| NULL |
| }; |
| |
| /* |
| ****************************************************************** |
| * Elan isr functions |
| ****************************************************************** |
| */ |
| static void elan_report_contact(struct elan_tp_data *data, |
| int contact_num, bool contact_valid, |
| u8 *finger_data) |
| { |
| struct input_dev *input = data->input; |
| unsigned int pos_x, pos_y; |
| unsigned int pressure, mk_x, mk_y; |
| unsigned int area_x, area_y, major, minor; |
| unsigned int scaled_pressure; |
| |
| if (contact_valid) { |
| pos_x = ((finger_data[0] & 0xf0) << 4) | |
| finger_data[1]; |
| pos_y = ((finger_data[0] & 0x0f) << 8) | |
| finger_data[2]; |
| mk_x = (finger_data[3] & 0x0f); |
| mk_y = (finger_data[3] >> 4); |
| pressure = finger_data[4]; |
| |
| if (pos_x > data->max_x || pos_y > data->max_y) { |
| dev_dbg(input->dev.parent, |
| "[%d] x=%d y=%d over max (%d, %d)", |
| contact_num, pos_x, pos_y, |
| data->max_x, data->max_y); |
| return; |
| } |
| |
| /* |
| * To avoid treating large finger as palm, let's reduce the |
| * width x and y per trace. |
| */ |
| area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE); |
| area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE); |
| |
| major = max(area_x, area_y); |
| minor = min(area_x, area_y); |
| |
| scaled_pressure = pressure + data->pressure_adjustment; |
| |
| if (scaled_pressure > ETP_MAX_PRESSURE) |
| scaled_pressure = ETP_MAX_PRESSURE; |
| |
| input_mt_slot(input, contact_num); |
| input_mt_report_slot_state(input, MT_TOOL_FINGER, true); |
| input_report_abs(input, ABS_MT_POSITION_X, pos_x); |
| input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y); |
| input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure); |
| input_report_abs(input, ABS_TOOL_WIDTH, mk_x); |
| input_report_abs(input, ABS_MT_TOUCH_MAJOR, major); |
| input_report_abs(input, ABS_MT_TOUCH_MINOR, minor); |
| } else { |
| input_mt_slot(input, contact_num); |
| input_mt_report_slot_state(input, MT_TOOL_FINGER, false); |
| } |
| } |
| |
| static void elan_report_absolute(struct elan_tp_data *data, u8 *packet) |
| { |
| struct input_dev *input = data->input; |
| u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET]; |
| int i; |
| u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET]; |
| u8 hover_info = packet[ETP_HOVER_INFO_OFFSET]; |
| bool contact_valid, hover_event; |
| |
| hover_event = hover_info & 0x40; |
| for (i = 0; i < ETP_MAX_FINGERS; i++) { |
| contact_valid = tp_info & (1U << (3 + i)); |
| elan_report_contact(data, i, contact_valid, finger_data); |
| |
| if (contact_valid) |
| finger_data += ETP_FINGER_DATA_LEN; |
| } |
| |
| input_report_key(input, BTN_LEFT, tp_info & 0x01); |
| input_report_abs(input, ABS_DISTANCE, hover_event != 0); |
| input_mt_report_pointer_emulation(input, true); |
| input_sync(input); |
| } |
| |
| static irqreturn_t elan_isr(int irq, void *dev_id) |
| { |
| struct elan_tp_data *data = dev_id; |
| struct device *dev = &data->client->dev; |
| int error; |
| u8 report[ETP_MAX_REPORT_LEN]; |
| |
| /* |
| * When device is connected to i2c bus, when all IAP page writes |
| * complete, the driver will receive interrupt and must read |
| * 0000 to confirm that IAP is finished. |
| */ |
| if (data->in_fw_update) { |
| complete(&data->fw_completion); |
| goto out; |
| } |
| |
| error = data->ops->get_report(data->client, report); |
| if (error) |
| goto out; |
| |
| if (report[ETP_REPORT_ID_OFFSET] != ETP_REPORT_ID) |
| dev_err(dev, "invalid report id data (%x)\n", |
| report[ETP_REPORT_ID_OFFSET]); |
| else |
| elan_report_absolute(data, report); |
| |
| out: |
| return IRQ_HANDLED; |
| } |
| |
| /* |
| ****************************************************************** |
| * Elan initialization functions |
| ****************************************************************** |
| */ |
| static int elan_setup_input_device(struct elan_tp_data *data) |
| { |
| struct device *dev = &data->client->dev; |
| struct input_dev *input; |
| unsigned int max_width = max(data->width_x, data->width_y); |
| unsigned int min_width = min(data->width_x, data->width_y); |
| int error; |
| |
| input = devm_input_allocate_device(dev); |
| if (!input) |
| return -ENOMEM; |
| |
| input->name = "Elan Touchpad"; |
| input->id.bustype = BUS_I2C; |
| input->id.vendor = ELAN_VENDOR_ID; |
| input->id.product = data->product_id; |
| input_set_drvdata(input, data); |
| |
| error = input_mt_init_slots(input, ETP_MAX_FINGERS, |
| INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED); |
| if (error) { |
| dev_err(dev, "failed to initialize MT slots: %d\n", error); |
| return error; |
| } |
| |
| __set_bit(EV_ABS, input->evbit); |
| __set_bit(INPUT_PROP_POINTER, input->propbit); |
| __set_bit(INPUT_PROP_BUTTONPAD, input->propbit); |
| __set_bit(BTN_LEFT, input->keybit); |
| |
| /* Set up ST parameters */ |
| input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0); |
| input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0); |
| input_abs_set_res(input, ABS_X, data->x_res); |
| input_abs_set_res(input, ABS_Y, data->y_res); |
| input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0); |
| input_set_abs_params(input, ABS_TOOL_WIDTH, 0, ETP_FINGER_WIDTH, 0, 0); |
| input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0); |
| |
| /* And MT parameters */ |
| input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0); |
| input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0); |
| input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res); |
| input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res); |
| input_set_abs_params(input, ABS_MT_PRESSURE, 0, |
| ETP_MAX_PRESSURE, 0, 0); |
| input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, |
| ETP_FINGER_WIDTH * max_width, 0, 0); |
| input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, |
| ETP_FINGER_WIDTH * min_width, 0, 0); |
| |
| data->input = input; |
| |
| return 0; |
| } |
| |
| static void elan_disable_regulator(void *_data) |
| { |
| struct elan_tp_data *data = _data; |
| |
| regulator_disable(data->vcc); |
| } |
| |
| static void elan_remove_sysfs_groups(void *_data) |
| { |
| struct elan_tp_data *data = _data; |
| |
| sysfs_remove_groups(&data->client->dev.kobj, elan_sysfs_groups); |
| } |
| |
| static int elan_probe(struct i2c_client *client, |
| const struct i2c_device_id *dev_id) |
| { |
| const struct elan_transport_ops *transport_ops; |
| struct device *dev = &client->dev; |
| struct elan_tp_data *data; |
| unsigned long irqflags; |
| int error; |
| |
| if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) && |
| i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
| transport_ops = &elan_i2c_ops; |
| } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) && |
| i2c_check_functionality(client->adapter, |
| I2C_FUNC_SMBUS_BYTE_DATA | |
| I2C_FUNC_SMBUS_BLOCK_DATA | |
| I2C_FUNC_SMBUS_I2C_BLOCK)) { |
| transport_ops = &elan_smbus_ops; |
| } else { |
| dev_err(dev, "not a supported I2C/SMBus adapter\n"); |
| return -EIO; |
| } |
| |
| data = devm_kzalloc(&client->dev, sizeof(struct elan_tp_data), |
| GFP_KERNEL); |
| if (!data) |
| return -ENOMEM; |
| |
| i2c_set_clientdata(client, data); |
| |
| data->ops = transport_ops; |
| data->client = client; |
| init_completion(&data->fw_completion); |
| mutex_init(&data->sysfs_mutex); |
| |
| data->vcc = devm_regulator_get(&client->dev, "vcc"); |
| if (IS_ERR(data->vcc)) { |
| error = PTR_ERR(data->vcc); |
| if (error != -EPROBE_DEFER) |
| dev_err(&client->dev, |
| "Failed to get 'vcc' regulator: %d\n", |
| error); |
| return error; |
| } |
| |
| error = regulator_enable(data->vcc); |
| if (error) { |
| dev_err(&client->dev, |
| "Failed to enable regulator: %d\n", error); |
| return error; |
| } |
| |
| error = devm_add_action(&client->dev, |
| elan_disable_regulator, data); |
| if (error) { |
| regulator_disable(data->vcc); |
| dev_err(&client->dev, |
| "Failed to add disable regulator action: %d\n", |
| error); |
| return error; |
| } |
| |
| /* Initialize the touchpad. */ |
| error = elan_initialize(data); |
| if (error) |
| return error; |
| |
| error = elan_query_device_info(data); |
| if (error) |
| return error; |
| |
| error = elan_query_device_parameters(data); |
| if (error) |
| return error; |
| |
| dev_dbg(&client->dev, |
| "Elan Touchpad Information:\n" |
| " Module product ID: 0x%04x\n" |
| " Firmware Version: 0x%04x\n" |
| " Sample Version: 0x%04x\n" |
| " IAP Version: 0x%04x\n" |
| " Max ABS X,Y: %d,%d\n" |
| " Width X,Y: %d,%d\n" |
| " Resolution X,Y: %d,%d (dots/mm)\n", |
| data->product_id, |
| data->fw_version, |
| data->sm_version, |
| data->iap_version, |
| data->max_x, data->max_y, |
| data->width_x, data->width_y, |
| data->x_res, data->y_res); |
| |
| /* Set up input device properties based on queried parameters. */ |
| error = elan_setup_input_device(data); |
| if (error) |
| return error; |
| |
| /* |
| * Systems using device tree should set up interrupt via DTS, |
| * the rest will use the default falling edge interrupts. |
| */ |
| irqflags = client->dev.of_node ? 0 : IRQF_TRIGGER_FALLING; |
| |
| error = devm_request_threaded_irq(&client->dev, client->irq, |
| NULL, elan_isr, |
| irqflags | IRQF_ONESHOT, |
| client->name, data); |
| if (error) { |
| dev_err(&client->dev, "cannot register irq=%d\n", client->irq); |
| return error; |
| } |
| |
| error = sysfs_create_groups(&client->dev.kobj, elan_sysfs_groups); |
| if (error) { |
| dev_err(&client->dev, "failed to create sysfs attributes: %d\n", |
| error); |
| return error; |
| } |
| |
| error = devm_add_action(&client->dev, |
| elan_remove_sysfs_groups, data); |
| if (error) { |
| elan_remove_sysfs_groups(data); |
| dev_err(&client->dev, |
| "Failed to add sysfs cleanup action: %d\n", |
| error); |
| return error; |
| } |
| |
| error = input_register_device(data->input); |
| if (error) { |
| dev_err(&client->dev, "failed to register input device: %d\n", |
| error); |
| return error; |
| } |
| |
| /* |
| * Systems using device tree should set up wakeup via DTS, |
| * the rest will configure device as wakeup source by default. |
| */ |
| if (!client->dev.of_node) |
| device_init_wakeup(&client->dev, true); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused elan_suspend(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct elan_tp_data *data = i2c_get_clientdata(client); |
| int ret; |
| |
| /* |
| * We are taking the mutex to make sure sysfs operations are |
| * complete before we attempt to bring the device into low[er] |
| * power mode. |
| */ |
| ret = mutex_lock_interruptible(&data->sysfs_mutex); |
| if (ret) |
| return ret; |
| |
| disable_irq(client->irq); |
| |
| if (device_may_wakeup(dev)) { |
| ret = elan_sleep(data); |
| /* Enable wake from IRQ */ |
| data->irq_wake = (enable_irq_wake(client->irq) == 0); |
| } else { |
| ret = elan_disable_power(data); |
| } |
| |
| mutex_unlock(&data->sysfs_mutex); |
| return ret; |
| } |
| |
| static int __maybe_unused elan_resume(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct elan_tp_data *data = i2c_get_clientdata(client); |
| int error; |
| |
| if (device_may_wakeup(dev) && data->irq_wake) { |
| disable_irq_wake(client->irq); |
| data->irq_wake = false; |
| } |
| |
| error = elan_enable_power(data); |
| if (error) { |
| dev_err(dev, "power up when resuming failed: %d\n", error); |
| goto err; |
| } |
| |
| error = elan_initialize(data); |
| if (error) |
| dev_err(dev, "initialize when resuming failed: %d\n", error); |
| |
| err: |
| enable_irq(data->client->irq); |
| return error; |
| } |
| |
| static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume); |
| |
| static const struct i2c_device_id elan_id[] = { |
| { DRIVER_NAME, 0 }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(i2c, elan_id); |
| |
| #ifdef CONFIG_ACPI |
| static const struct acpi_device_id elan_acpi_id[] = { |
| { "ELAN0000", 0 }, |
| { "ELAN0100", 0 }, |
| { "ELAN0600", 0 }, |
| { "ELAN0602", 0 }, |
| { "ELAN0605", 0 }, |
| { "ELAN0608", 0 }, |
| { "ELAN0605", 0 }, |
| { "ELAN0609", 0 }, |
| { "ELAN060B", 0 }, |
| { "ELAN0611", 0 }, |
| { "ELAN1000", 0 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(acpi, elan_acpi_id); |
| #endif |
| |
| #ifdef CONFIG_OF |
| static const struct of_device_id elan_of_match[] = { |
| { .compatible = "elan,ekth3000" }, |
| { /* sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(of, elan_of_match); |
| #endif |
| |
| static struct i2c_driver elan_driver = { |
| .driver = { |
| .name = DRIVER_NAME, |
| .pm = &elan_pm_ops, |
| .acpi_match_table = ACPI_PTR(elan_acpi_id), |
| .of_match_table = of_match_ptr(elan_of_match), |
| .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
| }, |
| .probe = elan_probe, |
| .id_table = elan_id, |
| }; |
| |
| module_i2c_driver(elan_driver); |
| |
| MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>"); |
| MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_VERSION(ELAN_DRIVER_VERSION); |