This patch adds support for the Azoteq IQS550/572/525 family of trackpad/touchscreen controllers. The driver has been tested with an IQS550EV02 evaluation board. A demonstration of the driver's capabilities is available here: https://youtu.be/sRNNx4XZBts Signed-off-by: Jeff LaBundy <jeff@xxxxxxxxxxx> --- Changes in v6: - None Changes in v5: - Demoted the first instance of dev_err in iqs5xx_update_firmware to dev_info - Updated the commit message to describe the test setup and provide a link to a demonstration of the driver's capabilities Changes in v4: - Replaced 'ret' with 'error' where applicable - Made use of packed structures to parse device ID and touch data registers as well as firmware records - Overhauled iqs5xx_update_firmware to make use of existing helper functions and to be robust against erroneous firmware files - Refactored and fortified the bootloader steps in iqs5xx_update_firmware by allowing additional retries upon failure - Optimized register read/write functions and added wrappers for single-byte transactions - Updated the error handling in iqs5xx_set_state and removed the superfluous 'disabled' flag - General improvements to error messages returned via dev_err Changes in v3: - None Changes in v2: - Rebased on top of updated iqs5xx.txt - Refactored the axis configuration logic in iqs5xx_dev_init to adhere to the behavior defined in touchscreen.txt drivers/input/touchscreen/Kconfig | 10 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/iqs5xx.c | 1015 ++++++++++++++++++++++++++++++++++++ 3 files changed, 1026 insertions(+) create mode 100644 drivers/input/touchscreen/iqs5xx.c diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index 6c16aae..d8337ed 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -1311,4 +1311,14 @@ config TOUCHSCREEN_ROHM_BU21023 To compile this driver as a module, choose M here: the module will be called bu21023_ts. +config TOUCHSCREEN_IQS5XX + tristate "Azoteq IQS550/572/525 trackpad/touchscreen controller" + depends on I2C + help + Say Y to enable support for the Azoteq IQS550/572/525 + family of trackpad/touchscreen controllers. + + To compile this driver as a module, choose M here: the + module will be called iqs5xx. + endif diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index fcc7605..084a596 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -110,3 +110,4 @@ obj-$(CONFIG_TOUCHSCREEN_ZFORCE) += zforce_ts.o obj-$(CONFIG_TOUCHSCREEN_COLIBRI_VF50) += colibri-vf50-ts.o obj-$(CONFIG_TOUCHSCREEN_ROHM_BU21023) += rohm_bu21023.o obj-$(CONFIG_TOUCHSCREEN_RASPBERRYPI_FW) += raspberrypi-ts.o +obj-$(CONFIG_TOUCHSCREEN_IQS5XX) += iqs5xx.o diff --git a/drivers/input/touchscreen/iqs5xx.c b/drivers/input/touchscreen/iqs5xx.c new file mode 100644 index 0000000..80d6da1 --- /dev/null +++ b/drivers/input/touchscreen/iqs5xx.c @@ -0,0 +1,1015 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Azoteq IQS550/572/525 Trackpad/Touchscreen Controller + * + * Copyright (C) 2018 + * Author: Jeff LaBundy <jeff@xxxxxxxxxxx> + * + * Note: these devices require firmware exported from a PC-based configuration + * tool made available by the manufacturer. The driver expects the firmware to + * be named according to the device (e.g. iqs550.hex for IQS550). + * + * Link to PC-based configuration tool and data sheet: http://www.azoteq.com/ + */ + +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/firmware.h> +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/input.h> +#include <linux/input/mt.h> +#include <linux/input/touchscreen.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/property.h> +#include <linux/slab.h> +#include <asm/unaligned.h> + +#define IQS5XX_NUM_RETRIES 10 +#define IQS5XX_NUM_POINTS 256 +#define IQS5XX_NUM_CONTACTS 5 +#define IQS5XX_WR_BYTES_MAX 2 + +#define IQS5XX_PROD_NUM_IQS550 40 +#define IQS5XX_PROD_NUM_IQS572 58 +#define IQS5XX_PROD_NUM_IQS525 52 +#define IQS5XX_PROJ_NUM_A000 0 +#define IQS5XX_PROJ_NUM_B000 15 +#define IQS5XX_MAJOR_VER_SPEC 2 + +#define IQS5XX_RESUME 0x00 +#define IQS5XX_SUSPEND 0x01 + +#define IQS5XX_SW_INPUT_EVENT 0x10 +#define IQS5XX_SETUP_COMPLETE 0x40 +#define IQS5XX_EVENT_MODE 0x01 +#define IQS5XX_TP_EVENT 0x04 + +#define IQS5XX_FLIP_X 0x01 +#define IQS5XX_FLIP_Y 0x02 +#define IQS5XX_SWITCH_XY_AXIS 0x04 + +#define IQS5XX_PROD_NUM 0x0000 +#define IQS5XX_ABS_X 0x0016 +#define IQS5XX_ABS_Y 0x0018 +#define IQS5XX_SYS_CTRL0 0x0431 +#define IQS5XX_SYS_CTRL1 0x0432 +#define IQS5XX_SYS_CFG0 0x058E +#define IQS5XX_SYS_CFG1 0x058F +#define IQS5XX_TOTAL_RX 0x063D +#define IQS5XX_TOTAL_TX 0x063E +#define IQS5XX_XY_CFG0 0x0669 +#define IQS5XX_X_RES 0x066E +#define IQS5XX_Y_RES 0x0670 +#define IQS5XX_EXP_VER 0x0677 +#define IQS5XX_CHKSM 0x83C0 +#define IQS5XX_APP 0x8400 +#define IQS5XX_CSTM 0xBE00 +#define IQS5XX_PMAP_END 0xBFFF +#define IQS5XX_END_COMM 0xEEEE + +#define IQS5XX_CHKSM_LEN (IQS5XX_APP - IQS5XX_CHKSM) +#define IQS5XX_APP_LEN (IQS5XX_CSTM - IQS5XX_APP) +#define IQS5XX_CSTM_LEN (IQS5XX_PMAP_END + 1 - IQS5XX_CSTM) +#define IQS5XX_PMAP_LEN (IQS5XX_PMAP_END + 1 - IQS5XX_CHKSM) + +#define IQS5XX_FW_NAME_LEN 11 +#define IQS5XX_REC_HDR_LEN 4 +#define IQS5XX_REC_LEN_MAX 256 +#define IQS5XX_REC_TYPE_DATA 0x00 +#define IQS5XX_REC_TYPE_EOF 0x01 + +#define IQS5XX_BL_ADDR_MASK 0x40 +#define IQS5XX_BL_CMD_VER 0x00 +#define IQS5XX_BL_CMD_READ 0x01 +#define IQS5XX_BL_CMD_EXEC 0x02 +#define IQS5XX_BL_CMD_CRC 0x03 +#define IQS5XX_BL_BLK_LEN_MAX 64 +#define IQS5XX_BL_ID 0x0200 +#define IQS5XX_BL_CRC_PASS 0x00 +#define IQS5XX_BL_CRC_FAIL 0x01 +#define IQS5XX_BL_ATTEMPTS 3 + +struct iqs5xx_private { + struct i2c_client *client; + struct input_dev *input; + struct gpio_desc *reset_gpio; +}; + +struct iqs5xx_dev_id_info { + __be16 prod_num; + __be16 proj_num; + u8 major_ver; + u8 minor_ver; + u8 bl_status; +} __packed; + +struct iqs5xx_ihex_rec { + char start; + char len[2]; + char addr[4]; + char type[2]; + char data[2]; +} __packed; + +struct iqs5xx_touch_data { + __be16 abs_x; + __be16 abs_y; + __be16 strength; + u8 area; +} __packed; + +static int iqs5xx_read_burst(struct i2c_client *client, + u16 reg, u8 *val8, u8 len) +{ + __be16 reg_buf = cpu_to_be16(reg); + int ret, i; + struct i2c_msg msg[] = { + { + .addr = client->addr, + .flags = 0, + .len = sizeof(reg_buf), + .buf = (u8 *)®_buf, + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .len = len, + .buf = val8, + }, + }; + + /* + * The first addressing attempt outside of a communication window fails + * and must be retried, after which the device clock stretches until it + * is available. + */ + for (i = 0; i < IQS5XX_NUM_RETRIES; i++) { + ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); + if (ret == ARRAY_SIZE(msg)) + return 0; + + usleep_range(200, 300); + } + + if (ret >= 0) + ret = -EIO; + + dev_err(&client->dev, "Failed to read from address 0x%04X: %d\n", + reg, ret); + + return ret; +} + +static int iqs5xx_read_word(struct i2c_client *client, u16 reg, u16 *val) +{ + __be16 val_buf; + int error; + + error = iqs5xx_read_burst(client, reg, (u8 *)&val_buf, sizeof(val_buf)); + if (error) + return error; + + *val = be16_to_cpu(val_buf); + + return 0; +} + +static int iqs5xx_read_byte(struct i2c_client *client, u16 reg, u8 *val8) +{ + return iqs5xx_read_burst(client, reg, val8, sizeof(*val8)); +} + +static int iqs5xx_write_burst(struct i2c_client *client, + u16 reg, u8 *val8, u8 len) +{ + int ret, i; + u8 mlen = sizeof(reg) + len; + u8 mbuf[sizeof(reg) + IQS5XX_WR_BYTES_MAX]; + + if (len > IQS5XX_WR_BYTES_MAX) + return -EINVAL; + + put_unaligned_be16(reg, mbuf); + memcpy(mbuf + sizeof(reg), val8, len); + + /* + * The first addressing attempt outside of a communication window fails + * and must be retried, after which the device clock stretches until it + * is available. + */ + for (i = 0; i < IQS5XX_NUM_RETRIES; i++) { + ret = i2c_master_send(client, (char *)mbuf, mlen); + if (ret == mlen) + return 0; + + usleep_range(200, 300); + } + + if (ret >= 0) + ret = -EIO; + + dev_err(&client->dev, "Failed to write to address 0x%04X: %d\n", + reg, ret); + + return ret; +} + +static int iqs5xx_write_word(struct i2c_client *client, u16 reg, u16 val) +{ + __be16 val_buf = cpu_to_be16(val); + + return iqs5xx_write_burst(client, reg, (u8 *)&val_buf, sizeof(val_buf)); +} + +static int iqs5xx_write_byte(struct i2c_client *client, u16 reg, u8 val8) +{ + return iqs5xx_write_burst(client, reg, &val8, sizeof(val8)); +} + +static void iqs5xx_reset(struct i2c_client *client) +{ + struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client); + + gpiod_set_value_cansleep(iqs5xx->reset_gpio, 0); + usleep_range(200, 300); + + gpiod_set_value_cansleep(iqs5xx->reset_gpio, 1); +} + +static int iqs5xx_bl_cmd(struct i2c_client *client, u8 bl_cmd, u16 bl_addr) +{ + struct i2c_msg msg; + int ret; + u8 mbuf[sizeof(bl_cmd) + sizeof(bl_addr)]; + + msg.addr = client->addr ^ IQS5XX_BL_ADDR_MASK; + msg.flags = 0; + msg.len = sizeof(bl_cmd); + msg.buf = mbuf; + + *mbuf = bl_cmd; + + switch (bl_cmd) { + case IQS5XX_BL_CMD_VER: + case IQS5XX_BL_CMD_CRC: + case IQS5XX_BL_CMD_EXEC: + break; + case IQS5XX_BL_CMD_READ: + msg.len += sizeof(bl_addr); + put_unaligned_be16(bl_addr, mbuf + sizeof(bl_cmd)); + break; + default: + return -EINVAL; + } + + ret = i2c_transfer(client->adapter, &msg, 1); + if (ret != 1) + goto msg_fail; + + switch (bl_cmd) { + case IQS5XX_BL_CMD_VER: + msg.len = sizeof(u16); + break; + case IQS5XX_BL_CMD_CRC: + msg.len = sizeof(u8); + /* + * This delay saves the bus controller the trouble of having to + * tolerate a relatively long clock-stretching period while the + * CRC is calculated. + */ + msleep(50); + break; + case IQS5XX_BL_CMD_EXEC: + usleep_range(10000, 10100); + /* intentionally fall through */ + default: + return 0; + } + + msg.flags = I2C_M_RD; + + ret = i2c_transfer(client->adapter, &msg, 1); + if (ret != 1) + goto msg_fail; + + if (bl_cmd == IQS5XX_BL_CMD_VER + && get_unaligned_be16(mbuf) != IQS5XX_BL_ID) { + dev_err(&client->dev, "Unexpected bootloader ID: 0x%04X\n", + get_unaligned_be16(mbuf)); + return -EINVAL; + } + + if (bl_cmd == IQS5XX_BL_CMD_CRC && *mbuf != IQS5XX_BL_CRC_PASS) { + dev_err(&client->dev, "Bootloader CRC failed\n"); + return -EIO; + } + + return 0; + +msg_fail: + if (ret >= 0) + ret = -EIO; + + if (bl_cmd != IQS5XX_BL_CMD_VER) + dev_err(&client->dev, + "Unsuccessful bootloader command 0x%02X: %d\n", + bl_cmd, ret); + + return ret; +} + +static int iqs5xx_bl_write(struct i2c_client *client, + u16 bl_addr, u8 *pmap_data, u16 pmap_len) +{ + struct i2c_msg msg; + int ret, i; + u8 mbuf[sizeof(bl_addr) + IQS5XX_BL_BLK_LEN_MAX]; + + if (pmap_len % IQS5XX_BL_BLK_LEN_MAX) + return -EINVAL; + + msg.addr = client->addr ^ IQS5XX_BL_ADDR_MASK; + msg.flags = 0; + msg.len = ARRAY_SIZE(mbuf); + msg.buf = mbuf; + + for (i = 0; i < pmap_len; i += IQS5XX_BL_BLK_LEN_MAX) { + put_unaligned_be16(bl_addr + i, mbuf); + memcpy(mbuf + sizeof(bl_addr), + pmap_data + i, IQS5XX_BL_BLK_LEN_MAX); + + ret = i2c_transfer(client->adapter, &msg, 1); + if (ret != 1) + goto msg_fail; + + usleep_range(10000, 10100); + } + + return 0; + +msg_fail: + if (ret >= 0) + ret = -EIO; + + dev_err(&client->dev, "Failed to write block at address 0x%04X: %d\n", + bl_addr + i, ret); + + return ret; +} + +static int iqs5xx_bl_verify(struct i2c_client *client, + u16 bl_addr, u8 *pmap_data, u16 pmap_len) +{ + struct i2c_msg msg; + int ret, i; + u8 bl_data[IQS5XX_BL_BLK_LEN_MAX]; + + if (pmap_len % IQS5XX_BL_BLK_LEN_MAX) + return -EINVAL; + + msg.addr = client->addr ^ IQS5XX_BL_ADDR_MASK; + msg.flags = I2C_M_RD; + msg.len = IQS5XX_BL_BLK_LEN_MAX; + msg.buf = bl_data; + + for (i = 0; i < pmap_len; i += IQS5XX_BL_BLK_LEN_MAX) { + ret = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_READ, bl_addr + i); + if (ret) + return ret; + + ret = i2c_transfer(client->adapter, &msg, 1); + if (ret != 1) + goto msg_fail; + + if (memcmp(bl_data, pmap_data + i, IQS5XX_BL_BLK_LEN_MAX)) { + dev_err(&client->dev, + "Failed to verify block at address 0x%04X\n", + bl_addr + i); + return -EIO; + } + } + + return 0; + +msg_fail: + if (ret >= 0) + ret = -EIO; + + dev_err(&client->dev, "Failed to read block at address 0x%04X: %d\n", + bl_addr + i, ret); + + return ret; +} + +static int iqs5xx_update_firmware(struct i2c_client *client) +{ + struct iqs5xx_ihex_rec *rec; + const struct firmware *fw; + char fw_name[IQS5XX_FW_NAME_LEN]; + int error, i, j; + u32 pos = 0; + 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]; + u8 *pmap = kzalloc(IQS5XX_PMAP_LEN, GFP_KERNEL); + + if (!pmap) + return -ENOMEM; + + snprintf(fw_name, ARRAY_SIZE(fw_name), "%s.hex", client->name); + dev_info(&client->dev, "Updating device from firmware %s...\n", + fw_name); + + error = request_firmware(&fw, fw_name, &client->dev); + if (error) { + dev_err(&client->dev, "Failed to request firmware %s: %d\n", + fw_name, error); + goto err_kfree; + } + + do { + if (pos + sizeof(*rec) > fw->size) { + dev_err(&client->dev, "Insufficient firmware size\n"); + error = -EINVAL; + goto err_rls_fw; + } + 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; + goto err_rls_fw; + } + + error = hex2bin(rec_hdr, rec->len, ARRAY_SIZE(rec_hdr)); + if (error) { + dev_err(&client->dev, "Invalid header at record %u\n", + rec_num); + goto err_rls_fw; + } + + 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; + goto err_rls_fw; + } + 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); + goto err_rls_fw; + } + + error = hex2bin(&rec_chksm, rec->data + rec_len * 2, 1); + if (error) { + dev_err(&client->dev, "Invalid checksum at record %u\n", + rec_num); + goto err_rls_fw; + } + + chksm = 0; + for (i = 0; i < ARRAY_SIZE(rec_hdr); i++) + chksm += rec_hdr[i]; + for (i = 0; i < rec_len; i++) + chksm += rec_data[i]; + chksm = ~chksm + 1; + + /* + * The checksum field for records corresponding to user-exported + * settings does not appear to be recalculated when the firmware + * is exported, so skip checksum verification for that region. + */ + if (chksm != rec_chksm && rec_addr < IQS5XX_CSTM) { + dev_err(&client->dev, + "Incorrect checksum at record %u\n", + rec_num); + error = -EINVAL; + goto err_rls_fw; + } + + 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; + goto err_rls_fw; + } + 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; + goto err_rls_fw; + } + + rec_num++; + while (pos < fw->size) { + if (*(fw->data + pos) == ':') + break; + pos++; + } + } while (rec_type != IQS5XX_REC_TYPE_EOF); + + /* + * The device opens a bootloader polling window for 2 ms following the + * release of reset. If the host cannot establish communication during + * this time frame, it must cycle reset again. + */ + for (i = 0; i < IQS5XX_BL_ATTEMPTS; i++) { + iqs5xx_reset(client); + + for (j = 0; j < IQS5XX_NUM_RETRIES; j++) { + error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_VER, 0); + if (error == -EINVAL || !error) + break; + } + + if (error == -EINVAL) + continue; + + if (j == IQS5XX_NUM_RETRIES) { + dev_err(&client->dev, + "Failed to enter bootloader: %d\n", + error); + continue; + } + + error = iqs5xx_bl_write(client, IQS5XX_CHKSM, + pmap, IQS5XX_PMAP_LEN); + if (error) + continue; + + error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_CRC, 0); + if (error) + continue; + + error = iqs5xx_bl_verify(client, IQS5XX_CSTM, + pmap + IQS5XX_CHKSM_LEN + IQS5XX_APP_LEN, + IQS5XX_CSTM_LEN); + if (error) + continue; + + error = iqs5xx_bl_cmd(client, IQS5XX_BL_CMD_EXEC, 0); + if (!error) + goto err_rls_fw; + } + + dev_err(&client->dev, "Aborting update after %d attempts\n", i); + +err_rls_fw: + release_firmware(fw); + +err_kfree: + kfree(pmap); + + return error; +} + +static int iqs5xx_dev_id(struct i2c_client *client, __be16 exp_ver_spec) +{ + struct iqs5xx_dev_id_info *dev_id_info; + int error; + u16 val; + u8 buf[sizeof(*dev_id_info) + 1]; + + /* + * Failure to read the device's ID registers could represent corrupted + * firmware. In that case, -EAGAIN is returned to prompt the caller to + * enter the bootloader. If the device is truly absent, the bootloader + * is inaccessible and the caller fails as well. + */ + buf[0] = 0; + error = iqs5xx_read_burst(client, + IQS5XX_PROD_NUM, &buf[1], sizeof(*dev_id_info)); + if (error) + return -EAGAIN; + + /* + * 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). + */ + 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, "Found legacy A000 firmware\n"); + return -EAGAIN; + 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_SPEC) { + dev_err(&client->dev, "Unexpected major version: %u\n", + dev_id_info->major_ver); + return -EAGAIN; + } + + if (be16_to_cpu(exp_ver_spec)) { + error = iqs5xx_read_word(client, IQS5XX_EXP_VER, &val); + if (error) + return error; + + if (val != be16_to_cpu(exp_ver_spec)) { + dev_err(&client->dev, + "Unexpected export version: %u.%u\n", + (val & 0xFF00) >> 8, val & 0x00FF); + return -EAGAIN; + } + } + + return 0; +} + +static int iqs5xx_dev_init(struct i2c_client *client) +{ + struct iqs5xx_private *iqs5xx = i2c_get_clientdata(client); + struct touchscreen_properties prop; + int error; + u16 max_x, max_x_hw; + u16 max_y, max_y_hw; + u8 val8; + + error = iqs5xx_read_byte(client, IQS5XX_TOTAL_RX, &val8); + if (error) + return error; + max_x_hw = (val8 - 1) * IQS5XX_NUM_POINTS; + + error = iqs5xx_read_byte(client, IQS5XX_TOTAL_TX, &val8); + if (error) + return error; + max_y_hw = (val8 - 1) * IQS5XX_NUM_POINTS; + + error = iqs5xx_read_byte(client, IQS5XX_XY_CFG0, &val8); + if (error) + return error; + + if (val8 & IQS5XX_SWITCH_XY_AXIS) + swap(max_x_hw, max_y_hw); + + touchscreen_parse_properties(iqs5xx->input, true, &prop); + + if (prop.swap_x_y) + val8 ^= IQS5XX_SWITCH_XY_AXIS; + + if (prop.invert_x) + val8 ^= prop.swap_x_y ? IQS5XX_FLIP_Y : IQS5XX_FLIP_X; + + if (prop.invert_y) + val8 ^= prop.swap_x_y ? IQS5XX_FLIP_X : IQS5XX_FLIP_Y; + + error = iqs5xx_write_byte(client, IQS5XX_XY_CFG0, val8); + 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 = iqs5xx_read_byte(client, IQS5XX_SYS_CFG0, &val8); + if (error) + return error; + + val8 |= IQS5XX_SETUP_COMPLETE; + val8 &= ~IQS5XX_SW_INPUT_EVENT; + error = iqs5xx_write_byte(client, IQS5XX_SYS_CFG0, val8); + if (error) + return error; + + val8 = IQS5XX_TP_EVENT | IQS5XX_EVENT_MODE; + error = iqs5xx_write_byte(client, IQS5XX_SYS_CFG1, val8); + if (error) + return error; + + error = iqs5xx_write_byte(client, IQS5XX_END_COMM, 0); + if (error) + return error; + + /* + * The return from this function is delayed so as to avoid a relatively + * long clock-stretching period that occurs during open and close call- + * backs made when the input device is subsequently registered. + */ + msleep(100); + + return 0; +} + +static irqreturn_t iqs5xx_irq(int irq, void *data) +{ + struct iqs5xx_private *iqs5xx = (struct iqs5xx_private *)data; + struct iqs5xx_touch_data *touch_data; + struct i2c_client *client = iqs5xx->client; + struct input_dev *input = iqs5xx->input; + int error, i; + u8 buf[sizeof(*touch_data) * IQS5XX_NUM_CONTACTS]; + + error = iqs5xx_read_burst(client, IQS5XX_ABS_X, buf, ARRAY_SIZE(buf)); + if (error) + return IRQ_NONE; + + for (i = 0, touch_data = (struct iqs5xx_touch_data *)buf; + i < IQS5XX_NUM_CONTACTS; i++, touch_data++) { + input_mt_slot(input, i); + input_mt_report_slot_state(input, MT_TOOL_FINGER, + be16_to_cpu(touch_data->strength) > 0); + + if (!be16_to_cpu(touch_data->strength)) + continue; + + input_report_abs(input, ABS_MT_POSITION_X, + be16_to_cpu(touch_data->abs_x)); + input_report_abs(input, ABS_MT_POSITION_Y, + be16_to_cpu(touch_data->abs_y)); + input_report_abs(input, ABS_MT_PRESSURE, + be16_to_cpu(touch_data->strength)); + } + + input_mt_sync_frame(input); + input_sync(input); + + error = iqs5xx_write_byte(client, IQS5XX_END_COMM, 0); + if (error) + return IRQ_NONE; + + return IRQ_HANDLED; +} + +static int iqs5xx_set_state(struct i2c_client *client, u8 state) +{ + int error1, error2; + + /* + * Addressing the device outside of a communication window prompts it + * to assert the RDY output, so disable the interrupt line to prevent + * the handler from servicing a false interrupt. + */ + disable_irq(client->irq); + + error1 = iqs5xx_write_byte(client, IQS5XX_SYS_CTRL1, state); + error2 = iqs5xx_write_byte(client, IQS5XX_END_COMM, 0); + + usleep_range(200, 300); + enable_irq(client->irq); + + if (error1) + return error1; + + return error2; +} + +static int iqs5xx_open(struct input_dev *input) +{ + struct iqs5xx_private *iqs5xx = input_get_drvdata(input); + + return iqs5xx_set_state(iqs5xx->client, IQS5XX_RESUME); +} + +static void iqs5xx_close(struct input_dev *input) +{ + struct iqs5xx_private *iqs5xx = input_get_drvdata(input); + + iqs5xx_set_state(iqs5xx->client, IQS5XX_SUSPEND); +} + +static int __maybe_unused iqs5xx_suspend(struct device *dev) +{ + struct iqs5xx_private *iqs5xx = dev_get_drvdata(dev); + int error = 0; + + mutex_lock(&iqs5xx->input->mutex); + + if (iqs5xx->input->users) + error = iqs5xx_set_state(iqs5xx->client, IQS5XX_SUSPEND); + + mutex_unlock(&iqs5xx->input->mutex); + + return error; +} + +static int __maybe_unused iqs5xx_resume(struct device *dev) +{ + struct iqs5xx_private *iqs5xx = dev_get_drvdata(dev); + int error = 0; + + mutex_lock(&iqs5xx->input->mutex); + + if (iqs5xx->input->users) + error = iqs5xx_set_state(iqs5xx->client, IQS5XX_RESUME); + + mutex_unlock(&iqs5xx->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; + struct input_dev *input; + int error; + __be16 exp_ver_spec = cpu_to_be16(0); + + iqs5xx = devm_kzalloc(&client->dev, sizeof(*iqs5xx), GFP_KERNEL); + if (!iqs5xx) + return -ENOMEM; + + dev_set_drvdata(&client->dev, iqs5xx); + + 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; + } + + device_property_read_u8(&client->dev, + "azoteq,exp-ver-major", (u8 *)&exp_ver_spec); + device_property_read_u8(&client->dev, + "azoteq,exp-ver-minor", (u8 *)&exp_ver_spec + 1); + + iqs5xx_reset(client); + usleep_range(10000, 10100); + + error = iqs5xx_dev_id(client, exp_ver_spec); + switch (error) { + case 0: + break; + case -EAGAIN: + error = iqs5xx_update_firmware(client); + if (error) + return error; + + error = iqs5xx_dev_id(client, exp_ver_spec); + if (error) { + dev_err(&client->dev, + "Aborting device initialization\n"); + return -EINVAL; + } + break; + default: + return error; + } + + input = devm_input_allocate_device(&client->dev); + if (!input) + return -ENOMEM; + + input_set_drvdata(input, iqs5xx); + iqs5xx->input = input; + + input->name = client->name; + input->id.bustype = BUS_I2C; + input->open = iqs5xx_open; + input->close = iqs5xx_close; + + input_set_capability(input, EV_ABS, ABS_MT_POSITION_X); + input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y); + input_set_capability(input, EV_ABS, ABS_MT_PRESSURE); + + error = iqs5xx_dev_init(client); + if (error) + return error; + + error = input_mt_init_slots(input, + IQS5XX_NUM_CONTACTS, INPUT_MT_DIRECT); + if (error) { + dev_err(&client->dev, + "Failed to initialize slots: %d\n", error); + return error; + } + + error = devm_request_threaded_irq(&client->dev, client->irq, + NULL, iqs5xx_irq, + IRQF_ONESHOT | IRQF_TRIGGER_RISING, + client->name, iqs5xx); + if (error) { + dev_err(&client->dev, "Failed to request IRQ: %d\n", error); + return error; + } + + error = input_register_device(input); + if (error) { + dev_err(&client->dev, "Failed to register device: %d\n", error); + return error; + } + + return 0; +} + +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@xxxxxxxxxxx>"); +MODULE_DESCRIPTION("Azoteq IQS550/572/525 Trackpad/Touchscreen Controller"); +MODULE_LICENSE("GPL"); -- 2.7.4
