1134 строки
26 KiB
C
1134 строки
26 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Azoteq IQS550/572/525 Trackpad/Touchscreen Controller
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*
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* Copyright (C) 2018
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* Author: Jeff LaBundy <jeff@labundy.com>
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*
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* These devices require firmware exported from a PC-based configuration tool
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* made available by the vendor. Firmware files may be pushed to the device's
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* nonvolatile memory by writing the filename to the 'fw_file' sysfs control.
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*
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* Link to PC-based configuration tool and data sheet: http://www.azoteq.com/
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*/
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/firmware.h>
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/input/mt.h>
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#include <linux/input/touchscreen.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/slab.h>
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#include <asm/unaligned.h>
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#define IQS5XX_FW_FILE_LEN 64
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#define IQS5XX_NUM_RETRIES 10
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#define IQS5XX_NUM_POINTS 256
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#define IQS5XX_NUM_CONTACTS 5
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#define IQS5XX_WR_BYTES_MAX 2
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#define IQS5XX_PROD_NUM_IQS550 40
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#define IQS5XX_PROD_NUM_IQS572 58
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#define IQS5XX_PROD_NUM_IQS525 52
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#define IQS5XX_PROJ_NUM_A000 0
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#define IQS5XX_PROJ_NUM_B000 15
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#define IQS5XX_MAJOR_VER_MIN 2
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#define IQS5XX_RESUME 0x00
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#define IQS5XX_SUSPEND 0x01
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#define IQS5XX_SW_INPUT_EVENT 0x10
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#define IQS5XX_SETUP_COMPLETE 0x40
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#define IQS5XX_EVENT_MODE 0x01
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#define IQS5XX_TP_EVENT 0x04
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#define IQS5XX_FLIP_X 0x01
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#define IQS5XX_FLIP_Y 0x02
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#define IQS5XX_SWITCH_XY_AXIS 0x04
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#define IQS5XX_PROD_NUM 0x0000
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#define IQS5XX_ABS_X 0x0016
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#define IQS5XX_ABS_Y 0x0018
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#define IQS5XX_SYS_CTRL0 0x0431
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#define IQS5XX_SYS_CTRL1 0x0432
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#define IQS5XX_SYS_CFG0 0x058E
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#define IQS5XX_SYS_CFG1 0x058F
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#define IQS5XX_TOTAL_RX 0x063D
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#define IQS5XX_TOTAL_TX 0x063E
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#define IQS5XX_XY_CFG0 0x0669
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#define IQS5XX_X_RES 0x066E
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#define IQS5XX_Y_RES 0x0670
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#define IQS5XX_CHKSM 0x83C0
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#define IQS5XX_APP 0x8400
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#define IQS5XX_CSTM 0xBE00
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#define IQS5XX_PMAP_END 0xBFFF
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#define IQS5XX_END_COMM 0xEEEE
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#define IQS5XX_CHKSM_LEN (IQS5XX_APP - IQS5XX_CHKSM)
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#define IQS5XX_APP_LEN (IQS5XX_CSTM - IQS5XX_APP)
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#define IQS5XX_CSTM_LEN (IQS5XX_PMAP_END + 1 - IQS5XX_CSTM)
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#define IQS5XX_PMAP_LEN (IQS5XX_PMAP_END + 1 - IQS5XX_CHKSM)
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#define IQS5XX_REC_HDR_LEN 4
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#define IQS5XX_REC_LEN_MAX 255
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#define IQS5XX_REC_TYPE_DATA 0x00
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#define IQS5XX_REC_TYPE_EOF 0x01
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#define IQS5XX_BL_ADDR_MASK 0x40
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#define IQS5XX_BL_CMD_VER 0x00
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#define IQS5XX_BL_CMD_READ 0x01
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#define IQS5XX_BL_CMD_EXEC 0x02
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#define IQS5XX_BL_CMD_CRC 0x03
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#define IQS5XX_BL_BLK_LEN_MAX 64
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#define IQS5XX_BL_ID 0x0200
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#define IQS5XX_BL_STATUS_RESET 0x00
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#define IQS5XX_BL_STATUS_AVAIL 0xA5
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#define IQS5XX_BL_STATUS_NONE 0xEE
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#define IQS5XX_BL_CRC_PASS 0x00
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#define IQS5XX_BL_CRC_FAIL 0x01
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#define IQS5XX_BL_ATTEMPTS 3
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struct iqs5xx_private {
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struct i2c_client *client;
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struct input_dev *input;
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struct gpio_desc *reset_gpio;
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struct mutex lock;
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u8 bl_status;
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};
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struct iqs5xx_dev_id_info {
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__be16 prod_num;
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__be16 proj_num;
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u8 major_ver;
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u8 minor_ver;
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u8 bl_status;
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} __packed;
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struct iqs5xx_ihex_rec {
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char start;
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char len[2];
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char addr[4];
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char type[2];
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char data[2];
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} __packed;
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struct iqs5xx_touch_data {
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__be16 abs_x;
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__be16 abs_y;
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__be16 strength;
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u8 area;
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} __packed;
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static int iqs5xx_read_burst(struct i2c_client *client,
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u16 reg, void *val, u16 len)
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{
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__be16 reg_buf = cpu_to_be16(reg);
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int ret, i;
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struct i2c_msg msg[] = {
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{
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.addr = client->addr,
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.flags = 0,
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.len = sizeof(reg_buf),
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.buf = (u8 *)®_buf,
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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 = len,
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.buf = (u8 *)val,
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},
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};
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/*
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* The first addressing attempt outside of a communication window fails
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* and must be retried, after which the device clock stretches until it
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* is available.
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*/
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for (i = 0; i < IQS5XX_NUM_RETRIES; i++) {
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ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
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if (ret == ARRAY_SIZE(msg))
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return 0;
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usleep_range(200, 300);
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}
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if (ret >= 0)
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ret = -EIO;
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dev_err(&client->dev, "Failed to read from address 0x%04X: %d\n",
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reg, ret);
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return ret;
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}
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static int iqs5xx_read_word(struct i2c_client *client, u16 reg, u16 *val)
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{
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__be16 val_buf;
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int error;
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error = iqs5xx_read_burst(client, reg, &val_buf, sizeof(val_buf));
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if (error)
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return error;
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*val = be16_to_cpu(val_buf);
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return 0;
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}
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static int iqs5xx_read_byte(struct i2c_client *client, u16 reg, u8 *val)
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{
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return iqs5xx_read_burst(client, reg, val, sizeof(*val));
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}
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static int iqs5xx_write_burst(struct i2c_client *client,
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u16 reg, const void *val, u16 len)
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{
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int ret, i;
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u16 mlen = sizeof(reg) + len;
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u8 mbuf[sizeof(reg) + IQS5XX_WR_BYTES_MAX];
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if (len > IQS5XX_WR_BYTES_MAX)
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return -EINVAL;
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put_unaligned_be16(reg, mbuf);
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memcpy(mbuf + sizeof(reg), val, len);
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/*
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* The first addressing attempt outside of a communication window fails
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* and must be retried, after which the device clock stretches until it
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* is available.
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*/
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for (i = 0; i < IQS5XX_NUM_RETRIES; i++) {
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ret = i2c_master_send(client, mbuf, mlen);
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if (ret == mlen)
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return 0;
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usleep_range(200, 300);
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}
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if (ret >= 0)
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ret = -EIO;
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dev_err(&client->dev, "Failed to write to address 0x%04X: %d\n",
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reg, ret);
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return ret;
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}
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static int iqs5xx_write_word(struct i2c_client *client, u16 reg, u16 val)
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{
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__be16 val_buf = cpu_to_be16(val);
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return iqs5xx_write_burst(client, reg, &val_buf, sizeof(val_buf));
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}
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static int iqs5xx_write_byte(struct i2c_client *client, u16 reg, u8 val)
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{
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return iqs5xx_write_burst(client, reg, &val, sizeof(val));
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}
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static void iqs5xx_reset(struct i2c_client *client)
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{
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struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
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gpiod_set_value_cansleep(iqs5xx->reset_gpio, 1);
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usleep_range(200, 300);
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gpiod_set_value_cansleep(iqs5xx->reset_gpio, 0);
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}
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static int iqs5xx_bl_cmd(struct i2c_client *client, u8 bl_cmd, u16 bl_addr)
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{
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struct i2c_msg msg;
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int ret;
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u8 mbuf[sizeof(bl_cmd) + sizeof(bl_addr)];
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msg.addr = client->addr ^ IQS5XX_BL_ADDR_MASK;
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msg.flags = 0;
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msg.len = sizeof(bl_cmd);
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msg.buf = mbuf;
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*mbuf = bl_cmd;
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switch (bl_cmd) {
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case IQS5XX_BL_CMD_VER:
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case IQS5XX_BL_CMD_CRC:
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case IQS5XX_BL_CMD_EXEC:
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break;
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case IQS5XX_BL_CMD_READ:
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msg.len += sizeof(bl_addr);
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put_unaligned_be16(bl_addr, mbuf + sizeof(bl_cmd));
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break;
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default:
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return -EINVAL;
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}
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ret = i2c_transfer(client->adapter, &msg, 1);
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if (ret != 1)
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goto msg_fail;
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switch (bl_cmd) {
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case IQS5XX_BL_CMD_VER:
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msg.len = sizeof(u16);
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break;
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case IQS5XX_BL_CMD_CRC:
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msg.len = sizeof(u8);
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/*
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* This delay saves the bus controller the trouble of having to
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* tolerate a relatively long clock-stretching period while the
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* CRC is calculated.
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*/
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msleep(50);
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break;
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case IQS5XX_BL_CMD_EXEC:
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usleep_range(10000, 10100);
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/* fall through */
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default:
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return 0;
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}
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msg.flags = I2C_M_RD;
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ret = i2c_transfer(client->adapter, &msg, 1);
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if (ret != 1)
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goto msg_fail;
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if (bl_cmd == IQS5XX_BL_CMD_VER &&
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get_unaligned_be16(mbuf) != IQS5XX_BL_ID) {
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dev_err(&client->dev, "Unrecognized bootloader ID: 0x%04X\n",
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get_unaligned_be16(mbuf));
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return -EINVAL;
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}
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if (bl_cmd == IQS5XX_BL_CMD_CRC && *mbuf != IQS5XX_BL_CRC_PASS) {
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dev_err(&client->dev, "Bootloader CRC failed\n");
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return -EIO;
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}
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return 0;
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msg_fail:
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if (ret >= 0)
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ret = -EIO;
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if (bl_cmd != IQS5XX_BL_CMD_VER)
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dev_err(&client->dev,
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"Unsuccessful bootloader command 0x%02X: %d\n",
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bl_cmd, ret);
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return ret;
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}
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static int iqs5xx_bl_open(struct i2c_client *client)
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{
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int error, i, j;
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/*
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* The device opens a bootloader polling window for 2 ms following the
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* release of reset. If the host cannot establish communication during
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* this time frame, it must cycle reset again.
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*/
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for (i = 0; i < IQS5XX_BL_ATTEMPTS; i++) {
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iqs5xx_reset(client);
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for (j = 0; j < IQS5XX_NUM_RETRIES; j++) {
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error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_VER, 0);
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if (!error || error == -EINVAL)
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return error;
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}
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}
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dev_err(&client->dev, "Failed to open bootloader: %d\n", error);
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return error;
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}
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static int iqs5xx_bl_write(struct i2c_client *client,
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u16 bl_addr, u8 *pmap_data, u16 pmap_len)
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{
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struct i2c_msg msg;
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int ret, i;
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u8 mbuf[sizeof(bl_addr) + IQS5XX_BL_BLK_LEN_MAX];
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if (pmap_len % IQS5XX_BL_BLK_LEN_MAX)
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return -EINVAL;
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msg.addr = client->addr ^ IQS5XX_BL_ADDR_MASK;
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msg.flags = 0;
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msg.len = sizeof(mbuf);
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msg.buf = mbuf;
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for (i = 0; i < pmap_len; i += IQS5XX_BL_BLK_LEN_MAX) {
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put_unaligned_be16(bl_addr + i, mbuf);
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memcpy(mbuf + sizeof(bl_addr), pmap_data + i,
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sizeof(mbuf) - sizeof(bl_addr));
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ret = i2c_transfer(client->adapter, &msg, 1);
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if (ret != 1)
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goto msg_fail;
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usleep_range(10000, 10100);
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}
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return 0;
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msg_fail:
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if (ret >= 0)
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ret = -EIO;
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dev_err(&client->dev, "Failed to write block at address 0x%04X: %d\n",
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bl_addr + i, ret);
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return ret;
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}
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static int iqs5xx_bl_verify(struct i2c_client *client,
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u16 bl_addr, u8 *pmap_data, u16 pmap_len)
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{
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struct i2c_msg msg;
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int ret, i;
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u8 bl_data[IQS5XX_BL_BLK_LEN_MAX];
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if (pmap_len % IQS5XX_BL_BLK_LEN_MAX)
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return -EINVAL;
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msg.addr = client->addr ^ IQS5XX_BL_ADDR_MASK;
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msg.flags = I2C_M_RD;
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msg.len = sizeof(bl_data);
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msg.buf = bl_data;
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for (i = 0; i < pmap_len; i += IQS5XX_BL_BLK_LEN_MAX) {
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ret = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_READ, bl_addr + i);
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if (ret)
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return ret;
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ret = i2c_transfer(client->adapter, &msg, 1);
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if (ret != 1)
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goto msg_fail;
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if (memcmp(bl_data, pmap_data + i, sizeof(bl_data))) {
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dev_err(&client->dev,
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"Failed to verify block at address 0x%04X\n",
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bl_addr + i);
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return -EIO;
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}
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}
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return 0;
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msg_fail:
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if (ret >= 0)
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ret = -EIO;
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dev_err(&client->dev, "Failed to read block at address 0x%04X: %d\n",
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bl_addr + i, ret);
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return ret;
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}
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static int iqs5xx_set_state(struct i2c_client *client, u8 state)
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{
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struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
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int error1, error2;
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if (iqs5xx->bl_status == IQS5XX_BL_STATUS_RESET)
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return 0;
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mutex_lock(&iqs5xx->lock);
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/*
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* Addressing the device outside of a communication window prompts it
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* to assert the RDY output, so disable the interrupt line to prevent
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* the handler from servicing a false interrupt.
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*/
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disable_irq(client->irq);
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error1 = iqs5xx_write_byte(client, IQS5XX_SYS_CTRL1, state);
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error2 = iqs5xx_write_byte(client, IQS5XX_END_COMM, 0);
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usleep_range(50, 100);
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enable_irq(client->irq);
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mutex_unlock(&iqs5xx->lock);
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if (error1)
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return error1;
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return error2;
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}
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static int iqs5xx_open(struct input_dev *input)
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{
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struct iqs5xx_private *iqs5xx = input_get_drvdata(input);
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return iqs5xx_set_state(iqs5xx->client, IQS5XX_RESUME);
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}
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static void iqs5xx_close(struct input_dev *input)
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{
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struct iqs5xx_private *iqs5xx = input_get_drvdata(input);
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iqs5xx_set_state(iqs5xx->client, IQS5XX_SUSPEND);
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}
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static int iqs5xx_axis_init(struct i2c_client *client)
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{
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struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
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struct touchscreen_properties prop;
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struct input_dev *input;
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int error;
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u16 max_x, max_x_hw;
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u16 max_y, max_y_hw;
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u8 val;
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if (!iqs5xx->input) {
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input = devm_input_allocate_device(&client->dev);
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if (!input)
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return -ENOMEM;
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input->name = client->name;
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input->id.bustype = BUS_I2C;
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input->open = iqs5xx_open;
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input->close = iqs5xx_close;
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input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
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input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
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input_set_capability(input, EV_ABS, ABS_MT_PRESSURE);
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|
|
input_set_drvdata(input, iqs5xx);
|
|
iqs5xx->input = input;
|
|
}
|
|
|
|
touchscreen_parse_properties(iqs5xx->input, true, &prop);
|
|
|
|
error = iqs5xx_read_byte(client, IQS5XX_TOTAL_RX, &val);
|
|
if (error)
|
|
return error;
|
|
max_x_hw = (val - 1) * IQS5XX_NUM_POINTS;
|
|
|
|
error = iqs5xx_read_byte(client, IQS5XX_TOTAL_TX, &val);
|
|
if (error)
|
|
return error;
|
|
max_y_hw = (val - 1) * IQS5XX_NUM_POINTS;
|
|
|
|
error = iqs5xx_read_byte(client, IQS5XX_XY_CFG0, &val);
|
|
if (error)
|
|
return error;
|
|
|
|
if (val & IQS5XX_SWITCH_XY_AXIS)
|
|
swap(max_x_hw, max_y_hw);
|
|
|
|
if (prop.swap_x_y)
|
|
val ^= IQS5XX_SWITCH_XY_AXIS;
|
|
|
|
if (prop.invert_x)
|
|
val ^= prop.swap_x_y ? IQS5XX_FLIP_Y : IQS5XX_FLIP_X;
|
|
|
|
if (prop.invert_y)
|
|
val ^= prop.swap_x_y ? IQS5XX_FLIP_X : IQS5XX_FLIP_Y;
|
|
|
|
error = iqs5xx_write_byte(client, IQS5XX_XY_CFG0, val);
|
|
if (error)
|
|
return error;
|
|
|
|
if (prop.max_x > max_x_hw) {
|
|
dev_err(&client->dev, "Invalid maximum x-coordinate: %u > %u\n",
|
|
prop.max_x, max_x_hw);
|
|
return -EINVAL;
|
|
} else if (prop.max_x == 0) {
|
|
error = iqs5xx_read_word(client, IQS5XX_X_RES, &max_x);
|
|
if (error)
|
|
return error;
|
|
|
|
input_abs_set_max(iqs5xx->input,
|
|
prop.swap_x_y ? ABS_MT_POSITION_Y :
|
|
ABS_MT_POSITION_X,
|
|
max_x);
|
|
} else {
|
|
max_x = (u16)prop.max_x;
|
|
}
|
|
|
|
if (prop.max_y > max_y_hw) {
|
|
dev_err(&client->dev, "Invalid maximum y-coordinate: %u > %u\n",
|
|
prop.max_y, max_y_hw);
|
|
return -EINVAL;
|
|
} else if (prop.max_y == 0) {
|
|
error = iqs5xx_read_word(client, IQS5XX_Y_RES, &max_y);
|
|
if (error)
|
|
return error;
|
|
|
|
input_abs_set_max(iqs5xx->input,
|
|
prop.swap_x_y ? ABS_MT_POSITION_X :
|
|
ABS_MT_POSITION_Y,
|
|
max_y);
|
|
} else {
|
|
max_y = (u16)prop.max_y;
|
|
}
|
|
|
|
/*
|
|
* Write horizontal and vertical resolution to the device in case its
|
|
* original defaults were overridden or swapped as per the properties
|
|
* specified in the device tree.
|
|
*/
|
|
error = iqs5xx_write_word(client,
|
|
prop.swap_x_y ? IQS5XX_Y_RES : IQS5XX_X_RES,
|
|
max_x);
|
|
if (error)
|
|
return error;
|
|
|
|
error = iqs5xx_write_word(client,
|
|
prop.swap_x_y ? IQS5XX_X_RES : IQS5XX_Y_RES,
|
|
max_y);
|
|
if (error)
|
|
return error;
|
|
|
|
error = input_mt_init_slots(iqs5xx->input, IQS5XX_NUM_CONTACTS,
|
|
INPUT_MT_DIRECT);
|
|
if (error)
|
|
dev_err(&client->dev, "Failed to initialize slots: %d\n",
|
|
error);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int iqs5xx_dev_init(struct i2c_client *client)
|
|
{
|
|
struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
|
|
struct iqs5xx_dev_id_info *dev_id_info;
|
|
int error;
|
|
u8 val;
|
|
u8 buf[sizeof(*dev_id_info) + 1];
|
|
|
|
error = iqs5xx_read_burst(client, IQS5XX_PROD_NUM,
|
|
&buf[1], sizeof(*dev_id_info));
|
|
if (error)
|
|
return iqs5xx_bl_open(client);
|
|
|
|
/*
|
|
* A000 and B000 devices use 8-bit and 16-bit addressing, respectively.
|
|
* Querying an A000 device's version information with 16-bit addressing
|
|
* gives the appearance that the data is shifted by one byte; a nonzero
|
|
* leading array element suggests this could be the case (in which case
|
|
* the missing zero is prepended).
|
|
*/
|
|
buf[0] = 0;
|
|
dev_id_info = (struct iqs5xx_dev_id_info *)&buf[(buf[1] > 0) ? 0 : 1];
|
|
|
|
switch (be16_to_cpu(dev_id_info->prod_num)) {
|
|
case IQS5XX_PROD_NUM_IQS550:
|
|
case IQS5XX_PROD_NUM_IQS572:
|
|
case IQS5XX_PROD_NUM_IQS525:
|
|
break;
|
|
default:
|
|
dev_err(&client->dev, "Unrecognized product number: %u\n",
|
|
be16_to_cpu(dev_id_info->prod_num));
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (be16_to_cpu(dev_id_info->proj_num)) {
|
|
case IQS5XX_PROJ_NUM_A000:
|
|
dev_err(&client->dev, "Unsupported project number: %u\n",
|
|
be16_to_cpu(dev_id_info->proj_num));
|
|
return iqs5xx_bl_open(client);
|
|
case IQS5XX_PROJ_NUM_B000:
|
|
break;
|
|
default:
|
|
dev_err(&client->dev, "Unrecognized project number: %u\n",
|
|
be16_to_cpu(dev_id_info->proj_num));
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (dev_id_info->major_ver < IQS5XX_MAJOR_VER_MIN) {
|
|
dev_err(&client->dev, "Unsupported major version: %u\n",
|
|
dev_id_info->major_ver);
|
|
return iqs5xx_bl_open(client);
|
|
}
|
|
|
|
switch (dev_id_info->bl_status) {
|
|
case IQS5XX_BL_STATUS_AVAIL:
|
|
case IQS5XX_BL_STATUS_NONE:
|
|
break;
|
|
default:
|
|
dev_err(&client->dev,
|
|
"Unrecognized bootloader status: 0x%02X\n",
|
|
dev_id_info->bl_status);
|
|
return -EINVAL;
|
|
}
|
|
|
|
error = iqs5xx_axis_init(client);
|
|
if (error)
|
|
return error;
|
|
|
|
error = iqs5xx_read_byte(client, IQS5XX_SYS_CFG0, &val);
|
|
if (error)
|
|
return error;
|
|
|
|
val |= IQS5XX_SETUP_COMPLETE;
|
|
val &= ~IQS5XX_SW_INPUT_EVENT;
|
|
error = iqs5xx_write_byte(client, IQS5XX_SYS_CFG0, val);
|
|
if (error)
|
|
return error;
|
|
|
|
val = IQS5XX_TP_EVENT | IQS5XX_EVENT_MODE;
|
|
error = iqs5xx_write_byte(client, IQS5XX_SYS_CFG1, val);
|
|
if (error)
|
|
return error;
|
|
|
|
error = iqs5xx_write_byte(client, IQS5XX_END_COMM, 0);
|
|
if (error)
|
|
return error;
|
|
|
|
iqs5xx->bl_status = dev_id_info->bl_status;
|
|
|
|
/*
|
|
* Closure of the first communication window that appears following the
|
|
* release of reset appears to kick off an initialization period during
|
|
* which further communication is met with clock stretching. The return
|
|
* from this function is delayed so that further communication attempts
|
|
* avoid this period.
|
|
*/
|
|
msleep(100);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t iqs5xx_irq(int irq, void *data)
|
|
{
|
|
struct iqs5xx_private *iqs5xx = data;
|
|
struct iqs5xx_touch_data touch_data[IQS5XX_NUM_CONTACTS];
|
|
struct i2c_client *client = iqs5xx->client;
|
|
struct input_dev *input = iqs5xx->input;
|
|
int error, i;
|
|
|
|
/*
|
|
* This check is purely a precaution, as the device does not assert the
|
|
* RDY output during bootloader mode. If the device operates outside of
|
|
* bootloader mode, the input device is guaranteed to be allocated.
|
|
*/
|
|
if (iqs5xx->bl_status == IQS5XX_BL_STATUS_RESET)
|
|
return IRQ_NONE;
|
|
|
|
error = iqs5xx_read_burst(client, IQS5XX_ABS_X,
|
|
touch_data, sizeof(touch_data));
|
|
if (error)
|
|
return IRQ_NONE;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(touch_data); i++) {
|
|
u16 pressure = be16_to_cpu(touch_data[i].strength);
|
|
|
|
input_mt_slot(input, i);
|
|
if (input_mt_report_slot_state(input, MT_TOOL_FINGER,
|
|
pressure != 0)) {
|
|
input_report_abs(input, ABS_MT_POSITION_X,
|
|
be16_to_cpu(touch_data[i].abs_x));
|
|
input_report_abs(input, ABS_MT_POSITION_Y,
|
|
be16_to_cpu(touch_data[i].abs_y));
|
|
input_report_abs(input, ABS_MT_PRESSURE, pressure);
|
|
}
|
|
}
|
|
|
|
input_mt_sync_frame(input);
|
|
input_sync(input);
|
|
|
|
error = iqs5xx_write_byte(client, IQS5XX_END_COMM, 0);
|
|
if (error)
|
|
return IRQ_NONE;
|
|
|
|
/*
|
|
* Once the communication window is closed, a small delay is added to
|
|
* ensure the device's RDY output has been deasserted by the time the
|
|
* interrupt handler returns.
|
|
*/
|
|
usleep_range(50, 100);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int iqs5xx_fw_file_parse(struct i2c_client *client,
|
|
const char *fw_file, u8 *pmap)
|
|
{
|
|
const struct firmware *fw;
|
|
struct iqs5xx_ihex_rec *rec;
|
|
size_t pos = 0;
|
|
int error, i;
|
|
u16 rec_num = 1;
|
|
u16 rec_addr;
|
|
u8 rec_len, rec_type, rec_chksm, chksm;
|
|
u8 rec_hdr[IQS5XX_REC_HDR_LEN];
|
|
u8 rec_data[IQS5XX_REC_LEN_MAX];
|
|
|
|
/*
|
|
* Firmware exported from the vendor's configuration tool deviates from
|
|
* standard ihex as follows: (1) the checksum for records corresponding
|
|
* to user-exported settings is not recalculated, and (2) an address of
|
|
* 0xFFFF is used for the EOF record.
|
|
*
|
|
* Because the ihex2fw tool tolerates neither (1) nor (2), the slightly
|
|
* nonstandard ihex firmware is parsed directly by the driver.
|
|
*/
|
|
error = request_firmware(&fw, fw_file, &client->dev);
|
|
if (error) {
|
|
dev_err(&client->dev, "Failed to request firmware %s: %d\n",
|
|
fw_file, error);
|
|
return error;
|
|
}
|
|
|
|
do {
|
|
if (pos + sizeof(*rec) > fw->size) {
|
|
dev_err(&client->dev, "Insufficient firmware size\n");
|
|
error = -EINVAL;
|
|
break;
|
|
}
|
|
rec = (struct iqs5xx_ihex_rec *)(fw->data + pos);
|
|
pos += sizeof(*rec);
|
|
|
|
if (rec->start != ':') {
|
|
dev_err(&client->dev, "Invalid start at record %u\n",
|
|
rec_num);
|
|
error = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
error = hex2bin(rec_hdr, rec->len, sizeof(rec_hdr));
|
|
if (error) {
|
|
dev_err(&client->dev, "Invalid header at record %u\n",
|
|
rec_num);
|
|
break;
|
|
}
|
|
|
|
rec_len = *rec_hdr;
|
|
rec_addr = get_unaligned_be16(rec_hdr + sizeof(rec_len));
|
|
rec_type = *(rec_hdr + sizeof(rec_len) + sizeof(rec_addr));
|
|
|
|
if (pos + rec_len * 2 > fw->size) {
|
|
dev_err(&client->dev, "Insufficient firmware size\n");
|
|
error = -EINVAL;
|
|
break;
|
|
}
|
|
pos += (rec_len * 2);
|
|
|
|
error = hex2bin(rec_data, rec->data, rec_len);
|
|
if (error) {
|
|
dev_err(&client->dev, "Invalid data at record %u\n",
|
|
rec_num);
|
|
break;
|
|
}
|
|
|
|
error = hex2bin(&rec_chksm,
|
|
rec->data + rec_len * 2, sizeof(rec_chksm));
|
|
if (error) {
|
|
dev_err(&client->dev, "Invalid checksum at record %u\n",
|
|
rec_num);
|
|
break;
|
|
}
|
|
|
|
chksm = 0;
|
|
for (i = 0; i < sizeof(rec_hdr); i++)
|
|
chksm += rec_hdr[i];
|
|
for (i = 0; i < rec_len; i++)
|
|
chksm += rec_data[i];
|
|
chksm = ~chksm + 1;
|
|
|
|
if (chksm != rec_chksm && rec_addr < IQS5XX_CSTM) {
|
|
dev_err(&client->dev,
|
|
"Incorrect checksum at record %u\n",
|
|
rec_num);
|
|
error = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
switch (rec_type) {
|
|
case IQS5XX_REC_TYPE_DATA:
|
|
if (rec_addr < IQS5XX_CHKSM ||
|
|
rec_addr > IQS5XX_PMAP_END) {
|
|
dev_err(&client->dev,
|
|
"Invalid address at record %u\n",
|
|
rec_num);
|
|
error = -EINVAL;
|
|
} else {
|
|
memcpy(pmap + rec_addr - IQS5XX_CHKSM,
|
|
rec_data, rec_len);
|
|
}
|
|
break;
|
|
case IQS5XX_REC_TYPE_EOF:
|
|
break;
|
|
default:
|
|
dev_err(&client->dev, "Invalid type at record %u\n",
|
|
rec_num);
|
|
error = -EINVAL;
|
|
}
|
|
|
|
if (error)
|
|
break;
|
|
|
|
rec_num++;
|
|
while (pos < fw->size) {
|
|
if (*(fw->data + pos) == ':')
|
|
break;
|
|
pos++;
|
|
}
|
|
} while (rec_type != IQS5XX_REC_TYPE_EOF);
|
|
|
|
release_firmware(fw);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int iqs5xx_fw_file_write(struct i2c_client *client, const char *fw_file)
|
|
{
|
|
struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client);
|
|
int error;
|
|
u8 *pmap;
|
|
|
|
if (iqs5xx->bl_status == IQS5XX_BL_STATUS_NONE)
|
|
return -EPERM;
|
|
|
|
pmap = kzalloc(IQS5XX_PMAP_LEN, GFP_KERNEL);
|
|
if (!pmap)
|
|
return -ENOMEM;
|
|
|
|
error = iqs5xx_fw_file_parse(client, fw_file, pmap);
|
|
if (error)
|
|
goto err_kfree;
|
|
|
|
mutex_lock(&iqs5xx->lock);
|
|
|
|
/*
|
|
* Disable the interrupt line in case the first attempt(s) to enter the
|
|
* bootloader don't happen quickly enough, in which case the device may
|
|
* assert the RDY output until the next attempt.
|
|
*/
|
|
disable_irq(client->irq);
|
|
|
|
iqs5xx->bl_status = IQS5XX_BL_STATUS_RESET;
|
|
|
|
error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_VER, 0);
|
|
if (error) {
|
|
error = iqs5xx_bl_open(client);
|
|
if (error)
|
|
goto err_reset;
|
|
}
|
|
|
|
error = iqs5xx_bl_write(client, IQS5XX_CHKSM, pmap, IQS5XX_PMAP_LEN);
|
|
if (error)
|
|
goto err_reset;
|
|
|
|
error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_CRC, 0);
|
|
if (error)
|
|
goto err_reset;
|
|
|
|
error = iqs5xx_bl_verify(client, IQS5XX_CSTM,
|
|
pmap + IQS5XX_CHKSM_LEN + IQS5XX_APP_LEN,
|
|
IQS5XX_CSTM_LEN);
|
|
if (error)
|
|
goto err_reset;
|
|
|
|
error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_EXEC, 0);
|
|
|
|
err_reset:
|
|
if (error) {
|
|
iqs5xx_reset(client);
|
|
usleep_range(10000, 10100);
|
|
}
|
|
|
|
error = iqs5xx_dev_init(client);
|
|
if (!error && iqs5xx->bl_status == IQS5XX_BL_STATUS_RESET)
|
|
error = -EINVAL;
|
|
|
|
enable_irq(client->irq);
|
|
|
|
mutex_unlock(&iqs5xx->lock);
|
|
|
|
err_kfree:
|
|
kfree(pmap);
|
|
|
|
return error;
|
|
}
|
|
|
|
static ssize_t fw_file_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct iqs5xx_private *iqs5xx = dev_get_drvdata(dev);
|
|
struct i2c_client *client = iqs5xx->client;
|
|
size_t len = count;
|
|
bool input_reg = !iqs5xx->input;
|
|
char fw_file[IQS5XX_FW_FILE_LEN + 1];
|
|
int error;
|
|
|
|
if (!len)
|
|
return -EINVAL;
|
|
|
|
if (buf[len - 1] == '\n')
|
|
len--;
|
|
|
|
if (len > IQS5XX_FW_FILE_LEN)
|
|
return -ENAMETOOLONG;
|
|
|
|
memcpy(fw_file, buf, len);
|
|
fw_file[len] = '\0';
|
|
|
|
error = iqs5xx_fw_file_write(client, fw_file);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* If the input device was not allocated already, it is guaranteed to
|
|
* be allocated by this point and can finally be registered.
|
|
*/
|
|
if (input_reg) {
|
|
error = input_register_device(iqs5xx->input);
|
|
if (error) {
|
|
dev_err(&client->dev,
|
|
"Failed to register device: %d\n",
|
|
error);
|
|
return error;
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR_WO(fw_file);
|
|
|
|
static struct attribute *iqs5xx_attrs[] = {
|
|
&dev_attr_fw_file.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group iqs5xx_attr_group = {
|
|
.attrs = iqs5xx_attrs,
|
|
};
|
|
|
|
static int __maybe_unused iqs5xx_suspend(struct device *dev)
|
|
{
|
|
struct iqs5xx_private *iqs5xx = dev_get_drvdata(dev);
|
|
struct input_dev *input = iqs5xx->input;
|
|
int error = 0;
|
|
|
|
if (!input)
|
|
return error;
|
|
|
|
mutex_lock(&input->mutex);
|
|
|
|
if (input->users)
|
|
error = iqs5xx_set_state(iqs5xx->client, IQS5XX_SUSPEND);
|
|
|
|
mutex_unlock(&input->mutex);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int __maybe_unused iqs5xx_resume(struct device *dev)
|
|
{
|
|
struct iqs5xx_private *iqs5xx = dev_get_drvdata(dev);
|
|
struct input_dev *input = iqs5xx->input;
|
|
int error = 0;
|
|
|
|
if (!input)
|
|
return error;
|
|
|
|
mutex_lock(&input->mutex);
|
|
|
|
if (input->users)
|
|
error = iqs5xx_set_state(iqs5xx->client, IQS5XX_RESUME);
|
|
|
|
mutex_unlock(&input->mutex);
|
|
|
|
return error;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(iqs5xx_pm, iqs5xx_suspend, iqs5xx_resume);
|
|
|
|
static int iqs5xx_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct iqs5xx_private *iqs5xx;
|
|
int error;
|
|
|
|
iqs5xx = devm_kzalloc(&client->dev, sizeof(*iqs5xx), GFP_KERNEL);
|
|
if (!iqs5xx)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, iqs5xx);
|
|
iqs5xx->client = client;
|
|
|
|
iqs5xx->reset_gpio = devm_gpiod_get(&client->dev,
|
|
"reset", GPIOD_OUT_LOW);
|
|
if (IS_ERR(iqs5xx->reset_gpio)) {
|
|
error = PTR_ERR(iqs5xx->reset_gpio);
|
|
dev_err(&client->dev, "Failed to request GPIO: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
mutex_init(&iqs5xx->lock);
|
|
|
|
iqs5xx_reset(client);
|
|
usleep_range(10000, 10100);
|
|
|
|
error = iqs5xx_dev_init(client);
|
|
if (error)
|
|
return error;
|
|
|
|
error = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL, iqs5xx_irq, IRQF_ONESHOT,
|
|
client->name, iqs5xx);
|
|
if (error) {
|
|
dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
error = devm_device_add_group(&client->dev, &iqs5xx_attr_group);
|
|
if (error) {
|
|
dev_err(&client->dev, "Failed to add attributes: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
if (iqs5xx->input) {
|
|
error = input_register_device(iqs5xx->input);
|
|
if (error)
|
|
dev_err(&client->dev,
|
|
"Failed to register device: %d\n",
|
|
error);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static const struct i2c_device_id iqs5xx_id[] = {
|
|
{ "iqs550", 0 },
|
|
{ "iqs572", 1 },
|
|
{ "iqs525", 2 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, iqs5xx_id);
|
|
|
|
static const struct of_device_id iqs5xx_of_match[] = {
|
|
{ .compatible = "azoteq,iqs550" },
|
|
{ .compatible = "azoteq,iqs572" },
|
|
{ .compatible = "azoteq,iqs525" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, iqs5xx_of_match);
|
|
|
|
static struct i2c_driver iqs5xx_i2c_driver = {
|
|
.driver = {
|
|
.name = "iqs5xx",
|
|
.of_match_table = iqs5xx_of_match,
|
|
.pm = &iqs5xx_pm,
|
|
},
|
|
.id_table = iqs5xx_id,
|
|
.probe = iqs5xx_probe,
|
|
};
|
|
module_i2c_driver(iqs5xx_i2c_driver);
|
|
|
|
MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
|
|
MODULE_DESCRIPTION("Azoteq IQS550/572/525 Trackpad/Touchscreen Controller");
|
|
MODULE_LICENSE("GPL");
|