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50fc7b6195
Commit 40f7090bb1 ("Input: elan_i2c_smbus - fix corrupted stack")
fixed most of the functions using i2c_smbus_read_block_data() to
allocate a buffer with the maximum block size. However three
functions were left unchanged:
* In elan_smbus_initialize(), increase the buffer size in the same
way.
* In elan_smbus_calibrate_result(), the buffer is provided by the
caller (calibrate_store()), so introduce a bounce buffer. Also
name the result buffer size.
* In elan_smbus_get_report(), the buffer is provided by the caller
but happens to be the right length. Add a compile-time assertion
to ensure this remains the case.
Cc: <stable@vger.kernel.org> # 3.19+
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/*
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* Elan I2C/SMBus Touchpad driver
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*
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* Copyright (c) 2013 ELAN Microelectronics Corp.
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*
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* Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
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*
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* Based on cyapa driver:
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* copyright (c) 2011-2012 Cypress Semiconductor, Inc.
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* copyright (c) 2011-2012 Google, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* Trademarks are the property of their respective owners.
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*/
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#ifndef _ELAN_I2C_H
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#define _ELAN_I2C_H
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#include <linux/types.h>
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#define ETP_ENABLE_ABS 0x0001
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#define ETP_ENABLE_CALIBRATE 0x0002
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#define ETP_DISABLE_CALIBRATE 0x0000
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#define ETP_DISABLE_POWER 0x0001
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#define ETP_PRESSURE_OFFSET 25
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#define ETP_CALIBRATE_MAX_LEN 3
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/* IAP Firmware handling */
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#define ETP_PRODUCT_ID_FORMAT_STRING "%d.0"
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#define ETP_FW_NAME "elan_i2c_" ETP_PRODUCT_ID_FORMAT_STRING ".bin"
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#define ETP_IAP_START_ADDR 0x0083
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#define ETP_FW_IAP_PAGE_ERR (1 << 5)
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#define ETP_FW_IAP_INTF_ERR (1 << 4)
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#define ETP_FW_PAGE_SIZE 64
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#define ETP_FW_SIGNATURE_SIZE 6
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struct i2c_client;
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struct completion;
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enum tp_mode {
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IAP_MODE = 1,
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MAIN_MODE
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};
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struct elan_transport_ops {
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int (*initialize)(struct i2c_client *client);
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int (*sleep_control)(struct i2c_client *, bool sleep);
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int (*power_control)(struct i2c_client *, bool enable);
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int (*set_mode)(struct i2c_client *client, u8 mode);
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int (*calibrate)(struct i2c_client *client);
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int (*calibrate_result)(struct i2c_client *client, u8 *val);
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int (*get_baseline_data)(struct i2c_client *client,
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bool max_baseliune, u8 *value);
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int (*get_version)(struct i2c_client *client, bool iap, u8 *version);
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int (*get_sm_version)(struct i2c_client *client,
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u16 *ic_type, u8 *version, u8 *clickpad);
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int (*get_checksum)(struct i2c_client *client, bool iap, u16 *csum);
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int (*get_product_id)(struct i2c_client *client, u16 *id);
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int (*get_max)(struct i2c_client *client,
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unsigned int *max_x, unsigned int *max_y);
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int (*get_resolution)(struct i2c_client *client,
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u8 *hw_res_x, u8 *hw_res_y);
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int (*get_num_traces)(struct i2c_client *client,
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unsigned int *x_tracenum,
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unsigned int *y_tracenum);
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int (*iap_get_mode)(struct i2c_client *client, enum tp_mode *mode);
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int (*iap_reset)(struct i2c_client *client);
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int (*prepare_fw_update)(struct i2c_client *client);
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int (*write_fw_block)(struct i2c_client *client,
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const u8 *page, u16 checksum, int idx);
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int (*finish_fw_update)(struct i2c_client *client,
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struct completion *reset_done);
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int (*get_report)(struct i2c_client *client, u8 *report);
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int (*get_pressure_adjustment)(struct i2c_client *client,
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int *adjustment);
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int (*get_pattern)(struct i2c_client *client, u8 *pattern);
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};
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extern const struct elan_transport_ops elan_smbus_ops, elan_i2c_ops;
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#endif /* _ELAN_I2C_H */
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