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![Jia-Ju Bai](/assets/img/avatar_default.png)
wdt87xx_resume() is never called in atomic context. It calls mdelay() to busily wait, which is not necessary. mdelay() can be replaced with msleep(). This is found by a static analysis tool named DCNS written by myself. Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
1185 lines
28 KiB
C
1185 lines
28 KiB
C
/*
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* Weida HiTech WDT87xx TouchScreen I2C driver
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*
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* Copyright (c) 2015 Weida Hi-Tech Co., Ltd.
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* HN Chen <hn.chen@weidahitech.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*/
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/firmware.h>
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#include <linux/input/mt.h>
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#include <linux/acpi.h>
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#include <asm/unaligned.h>
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#define WDT87XX_NAME "wdt87xx_i2c"
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#define WDT87XX_FW_NAME "wdt87xx_fw.bin"
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#define WDT87XX_CFG_NAME "wdt87xx_cfg.bin"
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#define MODE_ACTIVE 0x01
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#define MODE_READY 0x02
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#define MODE_IDLE 0x03
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#define MODE_SLEEP 0x04
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#define MODE_STOP 0xFF
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#define WDT_MAX_FINGER 10
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#define WDT_RAW_BUF_COUNT 54
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#define WDT_V1_RAW_BUF_COUNT 74
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#define WDT_FIRMWARE_ID 0xa9e368f5
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#define PG_SIZE 0x1000
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#define MAX_RETRIES 3
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#define MAX_UNIT_AXIS 0x7FFF
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#define PKT_READ_SIZE 72
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#define PKT_WRITE_SIZE 80
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/* the finger definition of the report event */
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#define FINGER_EV_OFFSET_ID 0
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#define FINGER_EV_OFFSET_X 1
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#define FINGER_EV_OFFSET_Y 3
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#define FINGER_EV_SIZE 5
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#define FINGER_EV_V1_OFFSET_ID 0
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#define FINGER_EV_V1_OFFSET_W 1
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#define FINGER_EV_V1_OFFSET_P 2
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#define FINGER_EV_V1_OFFSET_X 3
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#define FINGER_EV_V1_OFFSET_Y 5
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#define FINGER_EV_V1_SIZE 7
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/* The definition of a report packet */
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#define TOUCH_PK_OFFSET_REPORT_ID 0
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#define TOUCH_PK_OFFSET_EVENT 1
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#define TOUCH_PK_OFFSET_SCAN_TIME 51
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#define TOUCH_PK_OFFSET_FNGR_NUM 53
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#define TOUCH_PK_V1_OFFSET_REPORT_ID 0
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#define TOUCH_PK_V1_OFFSET_EVENT 1
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#define TOUCH_PK_V1_OFFSET_SCAN_TIME 71
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#define TOUCH_PK_V1_OFFSET_FNGR_NUM 73
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/* The definition of the controller parameters */
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#define CTL_PARAM_OFFSET_FW_ID 0
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#define CTL_PARAM_OFFSET_PLAT_ID 2
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#define CTL_PARAM_OFFSET_XMLS_ID1 4
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#define CTL_PARAM_OFFSET_XMLS_ID2 6
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#define CTL_PARAM_OFFSET_PHY_CH_X 8
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#define CTL_PARAM_OFFSET_PHY_CH_Y 10
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#define CTL_PARAM_OFFSET_PHY_X0 12
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#define CTL_PARAM_OFFSET_PHY_X1 14
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#define CTL_PARAM_OFFSET_PHY_Y0 16
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#define CTL_PARAM_OFFSET_PHY_Y1 18
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#define CTL_PARAM_OFFSET_PHY_W 22
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#define CTL_PARAM_OFFSET_PHY_H 24
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#define CTL_PARAM_OFFSET_FACTOR 32
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/* The definition of the device descriptor */
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#define WDT_GD_DEVICE 1
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#define DEV_DESC_OFFSET_VID 8
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#define DEV_DESC_OFFSET_PID 10
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/* Communication commands */
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#define PACKET_SIZE 56
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#define VND_REQ_READ 0x06
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#define VND_READ_DATA 0x07
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#define VND_REQ_WRITE 0x08
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#define VND_CMD_START 0x00
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#define VND_CMD_STOP 0x01
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#define VND_CMD_RESET 0x09
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#define VND_CMD_ERASE 0x1A
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#define VND_GET_CHECKSUM 0x66
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#define VND_SET_DATA 0x83
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#define VND_SET_COMMAND_DATA 0x84
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#define VND_SET_CHECKSUM_CALC 0x86
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#define VND_SET_CHECKSUM_LENGTH 0x87
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#define VND_CMD_SFLCK 0xFC
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#define VND_CMD_SFUNL 0xFD
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#define CMD_SFLCK_KEY 0xC39B
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#define CMD_SFUNL_KEY 0x95DA
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#define STRIDX_PLATFORM_ID 0x80
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#define STRIDX_PARAMETERS 0x81
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#define CMD_BUF_SIZE 8
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#define PKT_BUF_SIZE 64
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/* The definition of the command packet */
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#define CMD_REPORT_ID_OFFSET 0x0
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#define CMD_TYPE_OFFSET 0x1
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#define CMD_INDEX_OFFSET 0x2
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#define CMD_KEY_OFFSET 0x3
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#define CMD_LENGTH_OFFSET 0x4
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#define CMD_DATA_OFFSET 0x8
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/* The definition of firmware chunk tags */
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#define FOURCC_ID_RIFF 0x46464952
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#define FOURCC_ID_WHIF 0x46494857
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#define FOURCC_ID_FRMT 0x544D5246
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#define FOURCC_ID_FRWR 0x52575246
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#define FOURCC_ID_CNFG 0x47464E43
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#define CHUNK_ID_FRMT FOURCC_ID_FRMT
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#define CHUNK_ID_FRWR FOURCC_ID_FRWR
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#define CHUNK_ID_CNFG FOURCC_ID_CNFG
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#define FW_FOURCC1_OFFSET 0
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#define FW_SIZE_OFFSET 4
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#define FW_FOURCC2_OFFSET 8
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#define FW_PAYLOAD_OFFSET 40
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#define FW_CHUNK_ID_OFFSET 0
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#define FW_CHUNK_SIZE_OFFSET 4
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#define FW_CHUNK_TGT_START_OFFSET 8
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#define FW_CHUNK_PAYLOAD_LEN_OFFSET 12
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#define FW_CHUNK_SRC_START_OFFSET 16
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#define FW_CHUNK_VERSION_OFFSET 20
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#define FW_CHUNK_ATTR_OFFSET 24
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#define FW_CHUNK_PAYLOAD_OFFSET 32
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/* Controller requires minimum 300us between commands */
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#define WDT_COMMAND_DELAY_MS 2
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#define WDT_FLASH_WRITE_DELAY_MS 4
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#define WDT_FLASH_ERASE_DELAY_MS 200
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#define WDT_FW_RESET_TIME 2500
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struct wdt87xx_sys_param {
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u16 fw_id;
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u16 plat_id;
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u16 xmls_id1;
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u16 xmls_id2;
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u16 phy_ch_x;
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u16 phy_ch_y;
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u16 phy_w;
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u16 phy_h;
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u16 scaling_factor;
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u32 max_x;
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u32 max_y;
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u16 vendor_id;
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u16 product_id;
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};
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struct wdt87xx_data {
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struct i2c_client *client;
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struct input_dev *input;
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/* Mutex for fw update to prevent concurrent access */
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struct mutex fw_mutex;
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struct wdt87xx_sys_param param;
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u8 phys[32];
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};
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static int wdt87xx_i2c_xfer(struct i2c_client *client,
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void *txdata, size_t txlen,
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void *rxdata, size_t rxlen)
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{
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struct i2c_msg msgs[] = {
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{
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.addr = client->addr,
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.flags = 0,
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.len = txlen,
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.buf = txdata,
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},
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{
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = rxlen,
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.buf = rxdata,
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},
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};
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int error;
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int ret;
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ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (ret != ARRAY_SIZE(msgs)) {
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error = ret < 0 ? ret : -EIO;
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dev_err(&client->dev, "%s: i2c transfer failed: %d\n",
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__func__, error);
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return error;
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}
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return 0;
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}
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static int wdt87xx_get_desc(struct i2c_client *client, u8 desc_idx,
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u8 *buf, size_t len)
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{
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u8 tx_buf[] = { 0x22, 0x00, 0x10, 0x0E, 0x23, 0x00 };
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int error;
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tx_buf[2] |= desc_idx & 0xF;
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error = wdt87xx_i2c_xfer(client, tx_buf, sizeof(tx_buf),
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buf, len);
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if (error) {
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dev_err(&client->dev, "get desc failed: %d\n", error);
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return error;
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}
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if (buf[0] != len) {
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dev_err(&client->dev, "unexpected response to get desc: %d\n",
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buf[0]);
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return -EINVAL;
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}
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mdelay(WDT_COMMAND_DELAY_MS);
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return 0;
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}
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static int wdt87xx_get_string(struct i2c_client *client, u8 str_idx,
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u8 *buf, size_t len)
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{
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u8 tx_buf[] = { 0x22, 0x00, 0x13, 0x0E, str_idx, 0x23, 0x00 };
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u8 rx_buf[PKT_WRITE_SIZE];
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size_t rx_len = len + 2;
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int error;
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if (rx_len > sizeof(rx_buf))
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return -EINVAL;
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error = wdt87xx_i2c_xfer(client, tx_buf, sizeof(tx_buf),
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rx_buf, rx_len);
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if (error) {
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dev_err(&client->dev, "get string failed: %d\n", error);
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return error;
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}
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if (rx_buf[1] != 0x03) {
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dev_err(&client->dev, "unexpected response to get string: %d\n",
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rx_buf[1]);
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return -EINVAL;
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}
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rx_len = min_t(size_t, len, rx_buf[0]);
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memcpy(buf, &rx_buf[2], rx_len);
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mdelay(WDT_COMMAND_DELAY_MS);
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return 0;
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}
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static int wdt87xx_get_feature(struct i2c_client *client,
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u8 *buf, size_t buf_size)
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{
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u8 tx_buf[8];
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u8 rx_buf[PKT_WRITE_SIZE];
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size_t tx_len = 0;
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size_t rx_len = buf_size + 2;
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int error;
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if (rx_len > sizeof(rx_buf))
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return -EINVAL;
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/* Get feature command packet */
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tx_buf[tx_len++] = 0x22;
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tx_buf[tx_len++] = 0x00;
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if (buf[CMD_REPORT_ID_OFFSET] > 0xF) {
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tx_buf[tx_len++] = 0x30;
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tx_buf[tx_len++] = 0x02;
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tx_buf[tx_len++] = buf[CMD_REPORT_ID_OFFSET];
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} else {
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tx_buf[tx_len++] = 0x30 | buf[CMD_REPORT_ID_OFFSET];
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tx_buf[tx_len++] = 0x02;
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}
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tx_buf[tx_len++] = 0x23;
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tx_buf[tx_len++] = 0x00;
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error = wdt87xx_i2c_xfer(client, tx_buf, tx_len, rx_buf, rx_len);
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if (error) {
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dev_err(&client->dev, "get feature failed: %d\n", error);
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return error;
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}
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rx_len = min_t(size_t, buf_size, get_unaligned_le16(rx_buf));
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memcpy(buf, &rx_buf[2], rx_len);
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mdelay(WDT_COMMAND_DELAY_MS);
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return 0;
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}
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static int wdt87xx_set_feature(struct i2c_client *client,
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const u8 *buf, size_t buf_size)
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{
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u8 tx_buf[PKT_WRITE_SIZE];
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int tx_len = 0;
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int error;
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/* Set feature command packet */
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tx_buf[tx_len++] = 0x22;
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tx_buf[tx_len++] = 0x00;
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if (buf[CMD_REPORT_ID_OFFSET] > 0xF) {
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tx_buf[tx_len++] = 0x30;
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tx_buf[tx_len++] = 0x03;
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tx_buf[tx_len++] = buf[CMD_REPORT_ID_OFFSET];
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} else {
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tx_buf[tx_len++] = 0x30 | buf[CMD_REPORT_ID_OFFSET];
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tx_buf[tx_len++] = 0x03;
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}
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tx_buf[tx_len++] = 0x23;
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tx_buf[tx_len++] = 0x00;
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tx_buf[tx_len++] = (buf_size & 0xFF);
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tx_buf[tx_len++] = ((buf_size & 0xFF00) >> 8);
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if (tx_len + buf_size > sizeof(tx_buf))
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return -EINVAL;
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memcpy(&tx_buf[tx_len], buf, buf_size);
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tx_len += buf_size;
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error = i2c_master_send(client, tx_buf, tx_len);
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if (error < 0) {
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dev_err(&client->dev, "set feature failed: %d\n", error);
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return error;
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}
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mdelay(WDT_COMMAND_DELAY_MS);
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return 0;
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}
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static int wdt87xx_send_command(struct i2c_client *client, int cmd, int value)
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{
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u8 cmd_buf[CMD_BUF_SIZE];
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/* Set the command packet */
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cmd_buf[CMD_REPORT_ID_OFFSET] = VND_REQ_WRITE;
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cmd_buf[CMD_TYPE_OFFSET] = VND_SET_COMMAND_DATA;
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put_unaligned_le16((u16)cmd, &cmd_buf[CMD_INDEX_OFFSET]);
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switch (cmd) {
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case VND_CMD_START:
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case VND_CMD_STOP:
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case VND_CMD_RESET:
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/* Mode selector */
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put_unaligned_le32((value & 0xFF), &cmd_buf[CMD_LENGTH_OFFSET]);
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break;
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case VND_CMD_SFLCK:
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put_unaligned_le16(CMD_SFLCK_KEY, &cmd_buf[CMD_KEY_OFFSET]);
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break;
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case VND_CMD_SFUNL:
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put_unaligned_le16(CMD_SFUNL_KEY, &cmd_buf[CMD_KEY_OFFSET]);
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break;
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case VND_CMD_ERASE:
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case VND_SET_CHECKSUM_CALC:
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case VND_SET_CHECKSUM_LENGTH:
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put_unaligned_le32(value, &cmd_buf[CMD_KEY_OFFSET]);
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break;
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default:
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cmd_buf[CMD_REPORT_ID_OFFSET] = 0;
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dev_err(&client->dev, "Invalid command: %d\n", cmd);
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return -EINVAL;
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}
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return wdt87xx_set_feature(client, cmd_buf, sizeof(cmd_buf));
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}
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static int wdt87xx_sw_reset(struct i2c_client *client)
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{
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int error;
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dev_dbg(&client->dev, "resetting device now\n");
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error = wdt87xx_send_command(client, VND_CMD_RESET, 0);
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if (error) {
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dev_err(&client->dev, "reset failed\n");
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return error;
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}
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/* Wait the device to be ready */
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msleep(WDT_FW_RESET_TIME);
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return 0;
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}
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static const void *wdt87xx_get_fw_chunk(const struct firmware *fw, u32 id)
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{
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size_t pos = FW_PAYLOAD_OFFSET;
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u32 chunk_id, chunk_size;
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while (pos < fw->size) {
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chunk_id = get_unaligned_le32(fw->data +
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pos + FW_CHUNK_ID_OFFSET);
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if (chunk_id == id)
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return fw->data + pos;
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chunk_size = get_unaligned_le32(fw->data +
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pos + FW_CHUNK_SIZE_OFFSET);
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pos += chunk_size + 2 * sizeof(u32); /* chunk ID + size */
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}
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return NULL;
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}
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static int wdt87xx_get_sysparam(struct i2c_client *client,
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struct wdt87xx_sys_param *param)
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{
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u8 buf[PKT_READ_SIZE];
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int error;
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error = wdt87xx_get_desc(client, WDT_GD_DEVICE, buf, 18);
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if (error) {
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dev_err(&client->dev, "failed to get device desc\n");
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return error;
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}
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param->vendor_id = get_unaligned_le16(buf + DEV_DESC_OFFSET_VID);
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param->product_id = get_unaligned_le16(buf + DEV_DESC_OFFSET_PID);
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error = wdt87xx_get_string(client, STRIDX_PARAMETERS, buf, 34);
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if (error) {
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dev_err(&client->dev, "failed to get parameters\n");
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return error;
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}
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param->xmls_id1 = get_unaligned_le16(buf + CTL_PARAM_OFFSET_XMLS_ID1);
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param->xmls_id2 = get_unaligned_le16(buf + CTL_PARAM_OFFSET_XMLS_ID2);
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param->phy_ch_x = get_unaligned_le16(buf + CTL_PARAM_OFFSET_PHY_CH_X);
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param->phy_ch_y = get_unaligned_le16(buf + CTL_PARAM_OFFSET_PHY_CH_Y);
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param->phy_w = get_unaligned_le16(buf + CTL_PARAM_OFFSET_PHY_W) / 10;
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param->phy_h = get_unaligned_le16(buf + CTL_PARAM_OFFSET_PHY_H) / 10;
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/* Get the scaling factor of pixel to logical coordinate */
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param->scaling_factor =
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get_unaligned_le16(buf + CTL_PARAM_OFFSET_FACTOR);
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param->max_x = MAX_UNIT_AXIS;
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param->max_y = DIV_ROUND_CLOSEST(MAX_UNIT_AXIS * param->phy_h,
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param->phy_w);
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error = wdt87xx_get_string(client, STRIDX_PLATFORM_ID, buf, 8);
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if (error) {
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dev_err(&client->dev, "failed to get platform id\n");
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return error;
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}
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param->plat_id = buf[1];
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buf[0] = 0xf2;
|
|
error = wdt87xx_get_feature(client, buf, 16);
|
|
if (error) {
|
|
dev_err(&client->dev, "failed to get firmware id\n");
|
|
return error;
|
|
}
|
|
|
|
if (buf[0] != 0xf2) {
|
|
dev_err(&client->dev, "wrong id of fw response: 0x%x\n",
|
|
buf[0]);
|
|
return -EINVAL;
|
|
}
|
|
|
|
param->fw_id = get_unaligned_le16(&buf[1]);
|
|
|
|
dev_info(&client->dev,
|
|
"fw_id: 0x%x, plat_id: 0x%x, xml_id1: %04x, xml_id2: %04x\n",
|
|
param->fw_id, param->plat_id,
|
|
param->xmls_id1, param->xmls_id2);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wdt87xx_validate_firmware(struct wdt87xx_data *wdt,
|
|
const struct firmware *fw)
|
|
{
|
|
const void *fw_chunk;
|
|
u32 data1, data2;
|
|
u32 size;
|
|
u8 fw_chip_id;
|
|
u8 chip_id;
|
|
|
|
data1 = get_unaligned_le32(fw->data + FW_FOURCC1_OFFSET);
|
|
data2 = get_unaligned_le32(fw->data + FW_FOURCC2_OFFSET);
|
|
if (data1 != FOURCC_ID_RIFF || data2 != FOURCC_ID_WHIF) {
|
|
dev_err(&wdt->client->dev, "check fw tag failed\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
size = get_unaligned_le32(fw->data + FW_SIZE_OFFSET);
|
|
if (size != fw->size) {
|
|
dev_err(&wdt->client->dev,
|
|
"fw size mismatch: expected %d, actual %zu\n",
|
|
size, fw->size);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Get the chip_id from the firmware. Make sure that it is the
|
|
* right controller to do the firmware and config update.
|
|
*/
|
|
fw_chunk = wdt87xx_get_fw_chunk(fw, CHUNK_ID_FRWR);
|
|
if (!fw_chunk) {
|
|
dev_err(&wdt->client->dev,
|
|
"unable to locate firmware chunk\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
fw_chip_id = (get_unaligned_le32(fw_chunk +
|
|
FW_CHUNK_VERSION_OFFSET) >> 12) & 0xF;
|
|
chip_id = (wdt->param.fw_id >> 12) & 0xF;
|
|
|
|
if (fw_chip_id != chip_id) {
|
|
dev_err(&wdt->client->dev,
|
|
"fw version mismatch: fw %d vs. chip %d\n",
|
|
fw_chip_id, chip_id);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wdt87xx_validate_fw_chunk(const void *data, int id)
|
|
{
|
|
if (id == CHUNK_ID_FRWR) {
|
|
u32 fw_id;
|
|
|
|
fw_id = get_unaligned_le32(data + FW_CHUNK_PAYLOAD_OFFSET);
|
|
if (fw_id != WDT_FIRMWARE_ID)
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wdt87xx_write_data(struct i2c_client *client, const char *data,
|
|
u32 address, int length)
|
|
{
|
|
u16 packet_size;
|
|
int count = 0;
|
|
int error;
|
|
u8 pkt_buf[PKT_BUF_SIZE];
|
|
|
|
/* Address and length should be 4 bytes aligned */
|
|
if ((address & 0x3) != 0 || (length & 0x3) != 0) {
|
|
dev_err(&client->dev,
|
|
"addr & len must be 4 bytes aligned %x, %x\n",
|
|
address, length);
|
|
return -EINVAL;
|
|
}
|
|
|
|
while (length) {
|
|
packet_size = min(length, PACKET_SIZE);
|
|
|
|
pkt_buf[CMD_REPORT_ID_OFFSET] = VND_REQ_WRITE;
|
|
pkt_buf[CMD_TYPE_OFFSET] = VND_SET_DATA;
|
|
put_unaligned_le16(packet_size, &pkt_buf[CMD_INDEX_OFFSET]);
|
|
put_unaligned_le32(address, &pkt_buf[CMD_LENGTH_OFFSET]);
|
|
memcpy(&pkt_buf[CMD_DATA_OFFSET], data, packet_size);
|
|
|
|
error = wdt87xx_set_feature(client, pkt_buf, sizeof(pkt_buf));
|
|
if (error)
|
|
return error;
|
|
|
|
length -= packet_size;
|
|
data += packet_size;
|
|
address += packet_size;
|
|
|
|
/* Wait for the controller to finish the write */
|
|
mdelay(WDT_FLASH_WRITE_DELAY_MS);
|
|
|
|
if ((++count % 32) == 0) {
|
|
/* Delay for fw to clear watch dog */
|
|
msleep(20);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u16 misr(u16 cur_value, u8 new_value)
|
|
{
|
|
u32 a, b;
|
|
u32 bit0;
|
|
u32 y;
|
|
|
|
a = cur_value;
|
|
b = new_value;
|
|
bit0 = a ^ (b & 1);
|
|
bit0 ^= a >> 1;
|
|
bit0 ^= a >> 2;
|
|
bit0 ^= a >> 4;
|
|
bit0 ^= a >> 5;
|
|
bit0 ^= a >> 7;
|
|
bit0 ^= a >> 11;
|
|
bit0 ^= a >> 15;
|
|
y = (a << 1) ^ b;
|
|
y = (y & ~1) | (bit0 & 1);
|
|
|
|
return (u16)y;
|
|
}
|
|
|
|
static u16 wdt87xx_calculate_checksum(const u8 *data, size_t length)
|
|
{
|
|
u16 checksum = 0;
|
|
size_t i;
|
|
|
|
for (i = 0; i < length; i++)
|
|
checksum = misr(checksum, data[i]);
|
|
|
|
return checksum;
|
|
}
|
|
|
|
static int wdt87xx_get_checksum(struct i2c_client *client, u16 *checksum,
|
|
u32 address, int length)
|
|
{
|
|
int error;
|
|
int time_delay;
|
|
u8 pkt_buf[PKT_BUF_SIZE];
|
|
u8 cmd_buf[CMD_BUF_SIZE];
|
|
|
|
error = wdt87xx_send_command(client, VND_SET_CHECKSUM_LENGTH, length);
|
|
if (error) {
|
|
dev_err(&client->dev, "failed to set checksum length\n");
|
|
return error;
|
|
}
|
|
|
|
error = wdt87xx_send_command(client, VND_SET_CHECKSUM_CALC, address);
|
|
if (error) {
|
|
dev_err(&client->dev, "failed to set checksum address\n");
|
|
return error;
|
|
}
|
|
|
|
/* Wait the operation to complete */
|
|
time_delay = DIV_ROUND_UP(length, 1024);
|
|
msleep(time_delay * 30);
|
|
|
|
memset(cmd_buf, 0, sizeof(cmd_buf));
|
|
cmd_buf[CMD_REPORT_ID_OFFSET] = VND_REQ_READ;
|
|
cmd_buf[CMD_TYPE_OFFSET] = VND_GET_CHECKSUM;
|
|
error = wdt87xx_set_feature(client, cmd_buf, sizeof(cmd_buf));
|
|
if (error) {
|
|
dev_err(&client->dev, "failed to request checksum\n");
|
|
return error;
|
|
}
|
|
|
|
memset(pkt_buf, 0, sizeof(pkt_buf));
|
|
pkt_buf[CMD_REPORT_ID_OFFSET] = VND_READ_DATA;
|
|
error = wdt87xx_get_feature(client, pkt_buf, sizeof(pkt_buf));
|
|
if (error) {
|
|
dev_err(&client->dev, "failed to read checksum\n");
|
|
return error;
|
|
}
|
|
|
|
*checksum = get_unaligned_le16(&pkt_buf[CMD_DATA_OFFSET]);
|
|
return 0;
|
|
}
|
|
|
|
static int wdt87xx_write_firmware(struct i2c_client *client, const void *chunk)
|
|
{
|
|
u32 start_addr = get_unaligned_le32(chunk + FW_CHUNK_TGT_START_OFFSET);
|
|
u32 size = get_unaligned_le32(chunk + FW_CHUNK_PAYLOAD_LEN_OFFSET);
|
|
const void *data = chunk + FW_CHUNK_PAYLOAD_OFFSET;
|
|
int error;
|
|
int err1;
|
|
int page_size;
|
|
int retry = 0;
|
|
u16 device_checksum, firmware_checksum;
|
|
|
|
dev_dbg(&client->dev, "start 4k page program\n");
|
|
|
|
error = wdt87xx_send_command(client, VND_CMD_STOP, MODE_STOP);
|
|
if (error) {
|
|
dev_err(&client->dev, "stop report mode failed\n");
|
|
return error;
|
|
}
|
|
|
|
error = wdt87xx_send_command(client, VND_CMD_SFUNL, 0);
|
|
if (error) {
|
|
dev_err(&client->dev, "unlock failed\n");
|
|
goto out_enable_reporting;
|
|
}
|
|
|
|
mdelay(10);
|
|
|
|
while (size) {
|
|
dev_dbg(&client->dev, "%s: %x, %x\n", __func__,
|
|
start_addr, size);
|
|
|
|
page_size = min_t(u32, size, PG_SIZE);
|
|
size -= page_size;
|
|
|
|
for (retry = 0; retry < MAX_RETRIES; retry++) {
|
|
error = wdt87xx_send_command(client, VND_CMD_ERASE,
|
|
start_addr);
|
|
if (error) {
|
|
dev_err(&client->dev,
|
|
"erase failed at %#08x\n", start_addr);
|
|
break;
|
|
}
|
|
|
|
msleep(WDT_FLASH_ERASE_DELAY_MS);
|
|
|
|
error = wdt87xx_write_data(client, data, start_addr,
|
|
page_size);
|
|
if (error) {
|
|
dev_err(&client->dev,
|
|
"write failed at %#08x (%d bytes)\n",
|
|
start_addr, page_size);
|
|
break;
|
|
}
|
|
|
|
error = wdt87xx_get_checksum(client, &device_checksum,
|
|
start_addr, page_size);
|
|
if (error) {
|
|
dev_err(&client->dev,
|
|
"failed to retrieve checksum for %#08x (len: %d)\n",
|
|
start_addr, page_size);
|
|
break;
|
|
}
|
|
|
|
firmware_checksum =
|
|
wdt87xx_calculate_checksum(data, page_size);
|
|
|
|
if (device_checksum == firmware_checksum)
|
|
break;
|
|
|
|
dev_err(&client->dev,
|
|
"checksum fail: %d vs %d, retry %d\n",
|
|
device_checksum, firmware_checksum, retry);
|
|
}
|
|
|
|
if (retry == MAX_RETRIES) {
|
|
dev_err(&client->dev, "page write failed\n");
|
|
error = -EIO;
|
|
goto out_lock_device;
|
|
}
|
|
|
|
start_addr = start_addr + page_size;
|
|
data = data + page_size;
|
|
}
|
|
|
|
out_lock_device:
|
|
err1 = wdt87xx_send_command(client, VND_CMD_SFLCK, 0);
|
|
if (err1)
|
|
dev_err(&client->dev, "lock failed\n");
|
|
|
|
mdelay(10);
|
|
|
|
out_enable_reporting:
|
|
err1 = wdt87xx_send_command(client, VND_CMD_START, 0);
|
|
if (err1)
|
|
dev_err(&client->dev, "start to report failed\n");
|
|
|
|
return error ? error : err1;
|
|
}
|
|
|
|
static int wdt87xx_load_chunk(struct i2c_client *client,
|
|
const struct firmware *fw, u32 ck_id)
|
|
{
|
|
const void *chunk;
|
|
int error;
|
|
|
|
chunk = wdt87xx_get_fw_chunk(fw, ck_id);
|
|
if (!chunk) {
|
|
dev_err(&client->dev, "unable to locate chunk (type %d)\n",
|
|
ck_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
error = wdt87xx_validate_fw_chunk(chunk, ck_id);
|
|
if (error) {
|
|
dev_err(&client->dev, "invalid chunk (type %d): %d\n",
|
|
ck_id, error);
|
|
return error;
|
|
}
|
|
|
|
error = wdt87xx_write_firmware(client, chunk);
|
|
if (error) {
|
|
dev_err(&client->dev,
|
|
"failed to write fw chunk (type %d): %d\n",
|
|
ck_id, error);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wdt87xx_do_update_firmware(struct i2c_client *client,
|
|
const struct firmware *fw,
|
|
unsigned int chunk_id)
|
|
{
|
|
struct wdt87xx_data *wdt = i2c_get_clientdata(client);
|
|
int error;
|
|
|
|
error = wdt87xx_validate_firmware(wdt, fw);
|
|
if (error)
|
|
return error;
|
|
|
|
error = mutex_lock_interruptible(&wdt->fw_mutex);
|
|
if (error)
|
|
return error;
|
|
|
|
disable_irq(client->irq);
|
|
|
|
error = wdt87xx_load_chunk(client, fw, chunk_id);
|
|
if (error) {
|
|
dev_err(&client->dev,
|
|
"firmware load failed (type: %d): %d\n",
|
|
chunk_id, error);
|
|
goto out;
|
|
}
|
|
|
|
error = wdt87xx_sw_reset(client);
|
|
if (error) {
|
|
dev_err(&client->dev, "soft reset failed: %d\n", error);
|
|
goto out;
|
|
}
|
|
|
|
/* Refresh the parameters */
|
|
error = wdt87xx_get_sysparam(client, &wdt->param);
|
|
if (error)
|
|
dev_err(&client->dev,
|
|
"failed to refresh system parameters: %d\n", error);
|
|
out:
|
|
enable_irq(client->irq);
|
|
mutex_unlock(&wdt->fw_mutex);
|
|
|
|
return error ? error : 0;
|
|
}
|
|
|
|
static int wdt87xx_update_firmware(struct device *dev,
|
|
const char *fw_name, unsigned int chunk_id)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
const struct firmware *fw;
|
|
int error;
|
|
|
|
error = request_firmware(&fw, fw_name, dev);
|
|
if (error) {
|
|
dev_err(&client->dev, "unable to retrieve firmware %s: %d\n",
|
|
fw_name, error);
|
|
return error;
|
|
}
|
|
|
|
error = wdt87xx_do_update_firmware(client, fw, chunk_id);
|
|
|
|
release_firmware(fw);
|
|
|
|
return error ? error : 0;
|
|
}
|
|
|
|
static ssize_t config_csum_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct wdt87xx_data *wdt = i2c_get_clientdata(client);
|
|
u32 cfg_csum;
|
|
|
|
cfg_csum = wdt->param.xmls_id1;
|
|
cfg_csum = (cfg_csum << 16) | wdt->param.xmls_id2;
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%x\n", cfg_csum);
|
|
}
|
|
|
|
static ssize_t fw_version_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct wdt87xx_data *wdt = i2c_get_clientdata(client);
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%x\n", wdt->param.fw_id);
|
|
}
|
|
|
|
static ssize_t plat_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct wdt87xx_data *wdt = i2c_get_clientdata(client);
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%x\n", wdt->param.plat_id);
|
|
}
|
|
|
|
static ssize_t update_config_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
int error;
|
|
|
|
error = wdt87xx_update_firmware(dev, WDT87XX_CFG_NAME, CHUNK_ID_CNFG);
|
|
|
|
return error ? error : count;
|
|
}
|
|
|
|
static ssize_t update_fw_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
int error;
|
|
|
|
error = wdt87xx_update_firmware(dev, WDT87XX_FW_NAME, CHUNK_ID_FRWR);
|
|
|
|
return error ? error : count;
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(config_csum);
|
|
static DEVICE_ATTR_RO(fw_version);
|
|
static DEVICE_ATTR_RO(plat_id);
|
|
static DEVICE_ATTR_WO(update_config);
|
|
static DEVICE_ATTR_WO(update_fw);
|
|
|
|
static struct attribute *wdt87xx_attrs[] = {
|
|
&dev_attr_config_csum.attr,
|
|
&dev_attr_fw_version.attr,
|
|
&dev_attr_plat_id.attr,
|
|
&dev_attr_update_config.attr,
|
|
&dev_attr_update_fw.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group wdt87xx_attr_group = {
|
|
.attrs = wdt87xx_attrs,
|
|
};
|
|
|
|
static void wdt87xx_report_contact(struct input_dev *input,
|
|
struct wdt87xx_sys_param *param,
|
|
u8 *buf)
|
|
{
|
|
int finger_id;
|
|
u32 x, y, w;
|
|
u8 p;
|
|
|
|
finger_id = (buf[FINGER_EV_V1_OFFSET_ID] >> 3) - 1;
|
|
if (finger_id < 0)
|
|
return;
|
|
|
|
/* Check if this is an active contact */
|
|
if (!(buf[FINGER_EV_V1_OFFSET_ID] & 0x1))
|
|
return;
|
|
|
|
w = buf[FINGER_EV_V1_OFFSET_W];
|
|
w *= param->scaling_factor;
|
|
|
|
p = buf[FINGER_EV_V1_OFFSET_P];
|
|
|
|
x = get_unaligned_le16(buf + FINGER_EV_V1_OFFSET_X);
|
|
|
|
y = get_unaligned_le16(buf + FINGER_EV_V1_OFFSET_Y);
|
|
y = DIV_ROUND_CLOSEST(y * param->phy_h, param->phy_w);
|
|
|
|
/* Refuse incorrect coordinates */
|
|
if (x > param->max_x || y > param->max_y)
|
|
return;
|
|
|
|
dev_dbg(input->dev.parent, "tip on (%d), x(%d), y(%d)\n",
|
|
finger_id, x, y);
|
|
|
|
input_mt_slot(input, finger_id);
|
|
input_mt_report_slot_state(input, MT_TOOL_FINGER, 1);
|
|
input_report_abs(input, ABS_MT_TOUCH_MAJOR, w);
|
|
input_report_abs(input, ABS_MT_PRESSURE, p);
|
|
input_report_abs(input, ABS_MT_POSITION_X, x);
|
|
input_report_abs(input, ABS_MT_POSITION_Y, y);
|
|
}
|
|
|
|
static irqreturn_t wdt87xx_ts_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct wdt87xx_data *wdt = dev_id;
|
|
struct i2c_client *client = wdt->client;
|
|
int i, fingers;
|
|
int error;
|
|
u8 raw_buf[WDT_V1_RAW_BUF_COUNT] = {0};
|
|
|
|
error = i2c_master_recv(client, raw_buf, WDT_V1_RAW_BUF_COUNT);
|
|
if (error < 0) {
|
|
dev_err(&client->dev, "read v1 raw data failed: %d\n", error);
|
|
goto irq_exit;
|
|
}
|
|
|
|
fingers = raw_buf[TOUCH_PK_V1_OFFSET_FNGR_NUM];
|
|
if (!fingers)
|
|
goto irq_exit;
|
|
|
|
for (i = 0; i < WDT_MAX_FINGER; i++)
|
|
wdt87xx_report_contact(wdt->input,
|
|
&wdt->param,
|
|
&raw_buf[TOUCH_PK_V1_OFFSET_EVENT +
|
|
i * FINGER_EV_V1_SIZE]);
|
|
|
|
input_mt_sync_frame(wdt->input);
|
|
input_sync(wdt->input);
|
|
|
|
irq_exit:
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int wdt87xx_ts_create_input_device(struct wdt87xx_data *wdt)
|
|
{
|
|
struct device *dev = &wdt->client->dev;
|
|
struct input_dev *input;
|
|
unsigned int res = DIV_ROUND_CLOSEST(MAX_UNIT_AXIS, wdt->param.phy_w);
|
|
int error;
|
|
|
|
input = devm_input_allocate_device(dev);
|
|
if (!input) {
|
|
dev_err(dev, "failed to allocate input device\n");
|
|
return -ENOMEM;
|
|
}
|
|
wdt->input = input;
|
|
|
|
input->name = "WDT87xx Touchscreen";
|
|
input->id.bustype = BUS_I2C;
|
|
input->id.vendor = wdt->param.vendor_id;
|
|
input->id.product = wdt->param.product_id;
|
|
input->phys = wdt->phys;
|
|
|
|
input_set_abs_params(input, ABS_MT_POSITION_X, 0,
|
|
wdt->param.max_x, 0, 0);
|
|
input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
|
|
wdt->param.max_y, 0, 0);
|
|
input_abs_set_res(input, ABS_MT_POSITION_X, res);
|
|
input_abs_set_res(input, ABS_MT_POSITION_Y, res);
|
|
|
|
input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
|
|
0, wdt->param.max_x, 0, 0);
|
|
input_set_abs_params(input, ABS_MT_PRESSURE, 0, 0xFF, 0, 0);
|
|
|
|
input_mt_init_slots(input, WDT_MAX_FINGER,
|
|
INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
|
|
|
|
error = input_register_device(input);
|
|
if (error) {
|
|
dev_err(dev, "failed to register input device: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wdt87xx_ts_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct wdt87xx_data *wdt;
|
|
int error;
|
|
|
|
dev_dbg(&client->dev, "adapter=%d, client irq: %d\n",
|
|
client->adapter->nr, client->irq);
|
|
|
|
/* Check if the I2C function is ok in this adaptor */
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
|
|
return -ENXIO;
|
|
|
|
wdt = devm_kzalloc(&client->dev, sizeof(*wdt), GFP_KERNEL);
|
|
if (!wdt)
|
|
return -ENOMEM;
|
|
|
|
wdt->client = client;
|
|
mutex_init(&wdt->fw_mutex);
|
|
i2c_set_clientdata(client, wdt);
|
|
|
|
snprintf(wdt->phys, sizeof(wdt->phys), "i2c-%u-%04x/input0",
|
|
client->adapter->nr, client->addr);
|
|
|
|
error = wdt87xx_get_sysparam(client, &wdt->param);
|
|
if (error)
|
|
return error;
|
|
|
|
error = wdt87xx_ts_create_input_device(wdt);
|
|
if (error)
|
|
return error;
|
|
|
|
error = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL, wdt87xx_ts_interrupt,
|
|
IRQF_ONESHOT,
|
|
client->name, wdt);
|
|
if (error) {
|
|
dev_err(&client->dev, "request irq failed: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
error = devm_device_add_group(&client->dev, &wdt87xx_attr_group);
|
|
if (error) {
|
|
dev_err(&client->dev, "create sysfs failed: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused wdt87xx_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
int error;
|
|
|
|
disable_irq(client->irq);
|
|
|
|
error = wdt87xx_send_command(client, VND_CMD_STOP, MODE_IDLE);
|
|
if (error) {
|
|
enable_irq(client->irq);
|
|
dev_err(&client->dev,
|
|
"failed to stop device when suspending: %d\n",
|
|
error);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused wdt87xx_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
int error;
|
|
|
|
/*
|
|
* The chip may have been reset while system is resuming,
|
|
* give it some time to settle.
|
|
*/
|
|
msleep(100);
|
|
|
|
error = wdt87xx_send_command(client, VND_CMD_START, 0);
|
|
if (error)
|
|
dev_err(&client->dev,
|
|
"failed to start device when resuming: %d\n",
|
|
error);
|
|
|
|
enable_irq(client->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(wdt87xx_pm_ops, wdt87xx_suspend, wdt87xx_resume);
|
|
|
|
static const struct i2c_device_id wdt87xx_dev_id[] = {
|
|
{ WDT87XX_NAME, 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, wdt87xx_dev_id);
|
|
|
|
static const struct acpi_device_id wdt87xx_acpi_id[] = {
|
|
{ "WDHT0001", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, wdt87xx_acpi_id);
|
|
|
|
static struct i2c_driver wdt87xx_driver = {
|
|
.probe = wdt87xx_ts_probe,
|
|
.id_table = wdt87xx_dev_id,
|
|
.driver = {
|
|
.name = WDT87XX_NAME,
|
|
.pm = &wdt87xx_pm_ops,
|
|
.acpi_match_table = ACPI_PTR(wdt87xx_acpi_id),
|
|
},
|
|
};
|
|
module_i2c_driver(wdt87xx_driver);
|
|
|
|
MODULE_AUTHOR("HN Chen <hn.chen@weidahitech.com>");
|
|
MODULE_DESCRIPTION("WeidaHiTech WDT87XX Touchscreen driver");
|
|
MODULE_LICENSE("GPL");
|