From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/hid/hid-ft260.c | 1107 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1107 insertions(+) create mode 100644 drivers/hid/hid-ft260.c (limited to 'drivers/hid/hid-ft260.c') diff --git a/drivers/hid/hid-ft260.c b/drivers/hid/hid-ft260.c new file mode 100644 index 0000000000..333341e80b --- /dev/null +++ b/drivers/hid/hid-ft260.c @@ -0,0 +1,1107 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * hid-ft260.c - FTDI FT260 USB HID to I2C host bridge + * + * Copyright (c) 2021, Michael Zaidman + * + * Data Sheet: + * https://www.ftdichip.com/Support/Documents/DataSheets/ICs/DS_FT260.pdf + */ + +#include "hid-ids.h" +#include +#include +#include +#include + +#ifdef DEBUG +static int ft260_debug = 1; +#else +static int ft260_debug; +#endif +module_param_named(debug, ft260_debug, int, 0600); +MODULE_PARM_DESC(debug, "Toggle FT260 debugging messages"); + +#define ft260_dbg(format, arg...) \ + do { \ + if (ft260_debug) \ + pr_info("%s: " format, __func__, ##arg); \ + } while (0) + +#define FT260_REPORT_MAX_LENGTH (64) +#define FT260_I2C_DATA_REPORT_ID(len) (FT260_I2C_REPORT_MIN + (len - 1) / 4) + +#define FT260_WAKEUP_NEEDED_AFTER_MS (4800) /* 5s minus 200ms margin */ + +/* + * The ft260 input report format defines 62 bytes for the data payload, but + * when requested 62 bytes, the controller returns 60 and 2 in separate input + * reports. To achieve better performance with the multi-report read data + * transfers, we set the maximum read payload length to a multiple of 60. + * With a 100 kHz I2C clock, one 240 bytes read takes about 1/27 second, + * which is excessive; On the other hand, some higher layer drivers like at24 + * or optoe limit the i2c reads to 128 bytes. To not block other drivers out + * of I2C for potentially troublesome amounts of time, we select the maximum + * read payload length to be 180 bytes. +*/ +#define FT260_RD_DATA_MAX (180) +#define FT260_WR_DATA_MAX (60) + +/* + * Device interface configuration. + * The FT260 has 2 interfaces that are controlled by DCNF0 and DCNF1 pins. + * First implementes USB HID to I2C bridge function and + * second - USB HID to UART bridge function. + */ +enum { + FT260_MODE_ALL = 0x00, + FT260_MODE_I2C = 0x01, + FT260_MODE_UART = 0x02, + FT260_MODE_BOTH = 0x03, +}; + +/* Control pipe */ +enum { + FT260_GET_RQST_TYPE = 0xA1, + FT260_GET_REPORT = 0x01, + FT260_SET_RQST_TYPE = 0x21, + FT260_SET_REPORT = 0x09, + FT260_FEATURE = 0x03, +}; + +/* Report IDs / Feature In */ +enum { + FT260_CHIP_VERSION = 0xA0, + FT260_SYSTEM_SETTINGS = 0xA1, + FT260_I2C_STATUS = 0xC0, + FT260_I2C_READ_REQ = 0xC2, + FT260_I2C_REPORT_MIN = 0xD0, + FT260_I2C_REPORT_MAX = 0xDE, + FT260_GPIO = 0xB0, + FT260_UART_INTERRUPT_STATUS = 0xB1, + FT260_UART_STATUS = 0xE0, + FT260_UART_RI_DCD_STATUS = 0xE1, + FT260_UART_REPORT = 0xF0, +}; + +/* Feature Out */ +enum { + FT260_SET_CLOCK = 0x01, + FT260_SET_I2C_MODE = 0x02, + FT260_SET_UART_MODE = 0x03, + FT260_ENABLE_INTERRUPT = 0x05, + FT260_SELECT_GPIO2_FUNC = 0x06, + FT260_ENABLE_UART_DCD_RI = 0x07, + FT260_SELECT_GPIOA_FUNC = 0x08, + FT260_SELECT_GPIOG_FUNC = 0x09, + FT260_SET_INTERRUPT_TRIGGER = 0x0A, + FT260_SET_SUSPEND_OUT_POLAR = 0x0B, + FT260_ENABLE_UART_RI_WAKEUP = 0x0C, + FT260_SET_UART_RI_WAKEUP_CFG = 0x0D, + FT260_SET_I2C_RESET = 0x20, + FT260_SET_I2C_CLOCK_SPEED = 0x22, + FT260_SET_UART_RESET = 0x40, + FT260_SET_UART_CONFIG = 0x41, + FT260_SET_UART_BAUD_RATE = 0x42, + FT260_SET_UART_DATA_BIT = 0x43, + FT260_SET_UART_PARITY = 0x44, + FT260_SET_UART_STOP_BIT = 0x45, + FT260_SET_UART_BREAKING = 0x46, + FT260_SET_UART_XON_XOFF = 0x49, +}; + +/* Response codes in I2C status report */ +enum { + FT260_I2C_STATUS_SUCCESS = 0x00, + FT260_I2C_STATUS_CTRL_BUSY = 0x01, + FT260_I2C_STATUS_ERROR = 0x02, + FT260_I2C_STATUS_ADDR_NO_ACK = 0x04, + FT260_I2C_STATUS_DATA_NO_ACK = 0x08, + FT260_I2C_STATUS_ARBITR_LOST = 0x10, + FT260_I2C_STATUS_CTRL_IDLE = 0x20, + FT260_I2C_STATUS_BUS_BUSY = 0x40, +}; + +/* I2C Conditions flags */ +enum { + FT260_FLAG_NONE = 0x00, + FT260_FLAG_START = 0x02, + FT260_FLAG_START_REPEATED = 0x03, + FT260_FLAG_STOP = 0x04, + FT260_FLAG_START_STOP = 0x06, + FT260_FLAG_START_STOP_REPEATED = 0x07, +}; + +#define FT260_SET_REQUEST_VALUE(report_id) ((FT260_FEATURE << 8) | report_id) + +/* Feature In reports */ + +struct ft260_get_chip_version_report { + u8 report; /* FT260_CHIP_VERSION */ + u8 chip_code[4]; /* FTDI chip identification code */ + u8 reserved[8]; +} __packed; + +struct ft260_get_system_status_report { + u8 report; /* FT260_SYSTEM_SETTINGS */ + u8 chip_mode; /* DCNF0 and DCNF1 status, bits 0-1 */ + u8 clock_ctl; /* 0 - 12MHz, 1 - 24MHz, 2 - 48MHz */ + u8 suspend_status; /* 0 - not suspended, 1 - suspended */ + u8 pwren_status; /* 0 - FT260 is not ready, 1 - ready */ + u8 i2c_enable; /* 0 - disabled, 1 - enabled */ + u8 uart_mode; /* 0 - OFF; 1 - RTS_CTS, 2 - DTR_DSR, */ + /* 3 - XON_XOFF, 4 - No flow control */ + u8 hid_over_i2c_en; /* 0 - disabled, 1 - enabled */ + u8 gpio2_function; /* 0 - GPIO, 1 - SUSPOUT, */ + /* 2 - PWREN, 4 - TX_LED */ + u8 gpioA_function; /* 0 - GPIO, 3 - TX_ACTIVE, 4 - TX_LED */ + u8 gpioG_function; /* 0 - GPIO, 2 - PWREN, */ + /* 5 - RX_LED, 6 - BCD_DET */ + u8 suspend_out_pol; /* 0 - active-high, 1 - active-low */ + u8 enable_wakeup_int; /* 0 - disabled, 1 - enabled */ + u8 intr_cond; /* Interrupt trigger conditions */ + u8 power_saving_en; /* 0 - disabled, 1 - enabled */ + u8 reserved[10]; +} __packed; + +struct ft260_get_i2c_status_report { + u8 report; /* FT260_I2C_STATUS */ + u8 bus_status; /* I2C bus status */ + __le16 clock; /* I2C bus clock in range 60-3400 KHz */ + u8 reserved; +} __packed; + +/* Feature Out reports */ + +struct ft260_set_system_clock_report { + u8 report; /* FT260_SYSTEM_SETTINGS */ + u8 request; /* FT260_SET_CLOCK */ + u8 clock_ctl; /* 0 - 12MHz, 1 - 24MHz, 2 - 48MHz */ +} __packed; + +struct ft260_set_i2c_mode_report { + u8 report; /* FT260_SYSTEM_SETTINGS */ + u8 request; /* FT260_SET_I2C_MODE */ + u8 i2c_enable; /* 0 - disabled, 1 - enabled */ +} __packed; + +struct ft260_set_uart_mode_report { + u8 report; /* FT260_SYSTEM_SETTINGS */ + u8 request; /* FT260_SET_UART_MODE */ + u8 uart_mode; /* 0 - OFF; 1 - RTS_CTS, 2 - DTR_DSR, */ + /* 3 - XON_XOFF, 4 - No flow control */ +} __packed; + +struct ft260_set_i2c_reset_report { + u8 report; /* FT260_SYSTEM_SETTINGS */ + u8 request; /* FT260_SET_I2C_RESET */ +} __packed; + +struct ft260_set_i2c_speed_report { + u8 report; /* FT260_SYSTEM_SETTINGS */ + u8 request; /* FT260_SET_I2C_CLOCK_SPEED */ + __le16 clock; /* I2C bus clock in range 60-3400 KHz */ +} __packed; + +/* Data transfer reports */ + +struct ft260_i2c_write_request_report { + u8 report; /* FT260_I2C_REPORT */ + u8 address; /* 7-bit I2C address */ + u8 flag; /* I2C transaction condition */ + u8 length; /* data payload length */ + u8 data[FT260_WR_DATA_MAX]; /* data payload */ +} __packed; + +struct ft260_i2c_read_request_report { + u8 report; /* FT260_I2C_READ_REQ */ + u8 address; /* 7-bit I2C address */ + u8 flag; /* I2C transaction condition */ + __le16 length; /* data payload length */ +} __packed; + +struct ft260_i2c_input_report { + u8 report; /* FT260_I2C_REPORT */ + u8 length; /* data payload length */ + u8 data[2]; /* data payload */ +} __packed; + +static const struct hid_device_id ft260_devices[] = { + { HID_USB_DEVICE(USB_VENDOR_ID_FUTURE_TECHNOLOGY, + USB_DEVICE_ID_FT260) }, + { /* END OF LIST */ } +}; +MODULE_DEVICE_TABLE(hid, ft260_devices); + +struct ft260_device { + struct i2c_adapter adap; + struct hid_device *hdev; + struct completion wait; + struct mutex lock; + u8 write_buf[FT260_REPORT_MAX_LENGTH]; + unsigned long need_wakeup_at; + u8 *read_buf; + u16 read_idx; + u16 read_len; + u16 clock; +}; + +static int ft260_hid_feature_report_get(struct hid_device *hdev, + unsigned char report_id, u8 *data, + size_t len) +{ + u8 *buf; + int ret; + + buf = kmalloc(len, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret = hid_hw_raw_request(hdev, report_id, buf, len, HID_FEATURE_REPORT, + HID_REQ_GET_REPORT); + if (likely(ret == len)) + memcpy(data, buf, len); + else if (ret >= 0) + ret = -EIO; + kfree(buf); + return ret; +} + +static int ft260_hid_feature_report_set(struct hid_device *hdev, u8 *data, + size_t len) +{ + u8 *buf; + int ret; + + buf = kmemdup(data, len, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + buf[0] = FT260_SYSTEM_SETTINGS; + + ret = hid_hw_raw_request(hdev, buf[0], buf, len, HID_FEATURE_REPORT, + HID_REQ_SET_REPORT); + + kfree(buf); + return ret; +} + +static int ft260_i2c_reset(struct hid_device *hdev) +{ + struct ft260_set_i2c_reset_report report; + int ret; + + report.request = FT260_SET_I2C_RESET; + + ret = ft260_hid_feature_report_set(hdev, (u8 *)&report, sizeof(report)); + if (ret < 0) { + hid_err(hdev, "failed to reset I2C controller: %d\n", ret); + return ret; + } + + ft260_dbg("done\n"); + return ret; +} + +static int ft260_xfer_status(struct ft260_device *dev, u8 bus_busy) +{ + struct hid_device *hdev = dev->hdev; + struct ft260_get_i2c_status_report report; + int ret; + + if (time_is_before_jiffies(dev->need_wakeup_at)) { + ret = ft260_hid_feature_report_get(hdev, FT260_I2C_STATUS, + (u8 *)&report, sizeof(report)); + if (unlikely(ret < 0)) { + hid_err(hdev, "failed to retrieve status: %d, no wakeup\n", + ret); + } else { + dev->need_wakeup_at = jiffies + + msecs_to_jiffies(FT260_WAKEUP_NEEDED_AFTER_MS); + ft260_dbg("bus_status %#02x, wakeup\n", + report.bus_status); + } + } + + ret = ft260_hid_feature_report_get(hdev, FT260_I2C_STATUS, + (u8 *)&report, sizeof(report)); + if (unlikely(ret < 0)) { + hid_err(hdev, "failed to retrieve status: %d\n", ret); + return ret; + } + + dev->clock = le16_to_cpu(report.clock); + ft260_dbg("bus_status %#02x, clock %u\n", report.bus_status, + dev->clock); + + if (report.bus_status & (FT260_I2C_STATUS_CTRL_BUSY | bus_busy)) + return -EAGAIN; + + /* + * The error condition (bit 1) is a status bit reflecting any + * error conditions. When any of the bits 2, 3, or 4 are raised + * to 1, bit 1 is also set to 1. + */ + if (report.bus_status & FT260_I2C_STATUS_ERROR) { + hid_err(hdev, "i2c bus error: %#02x\n", report.bus_status); + return -EIO; + } + + return 0; +} + +static int ft260_hid_output_report(struct hid_device *hdev, u8 *data, + size_t len) +{ + u8 *buf; + int ret; + + buf = kmemdup(data, len, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret = hid_hw_output_report(hdev, buf, len); + + kfree(buf); + return ret; +} + +static int ft260_hid_output_report_check_status(struct ft260_device *dev, + u8 *data, int len) +{ + u8 bus_busy; + int ret, usec, try = 100; + struct hid_device *hdev = dev->hdev; + struct ft260_i2c_write_request_report *rep = + (struct ft260_i2c_write_request_report *)data; + + ret = ft260_hid_output_report(hdev, data, len); + if (ret < 0) { + hid_err(hdev, "%s: failed to start transfer, ret %d\n", + __func__, ret); + ft260_i2c_reset(hdev); + return ret; + } + + /* transfer time = 1 / clock(KHz) * 9 bits * bytes */ + usec = len * 9000 / dev->clock; + if (usec > 2000) { + usec -= 1500; + usleep_range(usec, usec + 100); + ft260_dbg("wait %d usec, len %d\n", usec, len); + } + + /* + * Do not check the busy bit for combined transactions + * since the controller keeps the bus busy between writing + * and reading IOs to ensure an atomic operation. + */ + if (rep->flag == FT260_FLAG_START) + bus_busy = 0; + else + bus_busy = FT260_I2C_STATUS_BUS_BUSY; + + do { + ret = ft260_xfer_status(dev, bus_busy); + if (ret != -EAGAIN) + break; + } while (--try); + + if (ret == 0) + return 0; + + ft260_i2c_reset(hdev); + return -EIO; +} + +static int ft260_i2c_write(struct ft260_device *dev, u8 addr, u8 *data, + int len, u8 flag) +{ + int ret, wr_len, idx = 0; + struct hid_device *hdev = dev->hdev; + struct ft260_i2c_write_request_report *rep = + (struct ft260_i2c_write_request_report *)dev->write_buf; + + if (len < 1) + return -EINVAL; + + rep->flag = FT260_FLAG_START; + + do { + if (len <= FT260_WR_DATA_MAX) { + wr_len = len; + if (flag == FT260_FLAG_START_STOP) + rep->flag |= FT260_FLAG_STOP; + } else { + wr_len = FT260_WR_DATA_MAX; + } + + rep->report = FT260_I2C_DATA_REPORT_ID(wr_len); + rep->address = addr; + rep->length = wr_len; + + memcpy(rep->data, &data[idx], wr_len); + + ft260_dbg("rep %#02x addr %#02x off %d len %d wlen %d flag %#x d[0] %#02x\n", + rep->report, addr, idx, len, wr_len, + rep->flag, data[0]); + + ret = ft260_hid_output_report_check_status(dev, (u8 *)rep, + wr_len + 4); + if (ret < 0) { + hid_err(hdev, "%s: failed with %d\n", __func__, ret); + return ret; + } + + len -= wr_len; + idx += wr_len; + rep->flag = 0; + + } while (len > 0); + + return 0; +} + +static int ft260_smbus_write(struct ft260_device *dev, u8 addr, u8 cmd, + u8 *data, u8 data_len, u8 flag) +{ + int ret = 0; + int len = 4; + + struct ft260_i2c_write_request_report *rep = + (struct ft260_i2c_write_request_report *)dev->write_buf; + + if (data_len >= sizeof(rep->data)) + return -EINVAL; + + rep->address = addr; + rep->data[0] = cmd; + rep->length = data_len + 1; + rep->flag = flag; + len += rep->length; + + rep->report = FT260_I2C_DATA_REPORT_ID(len); + + if (data_len > 0) + memcpy(&rep->data[1], data, data_len); + + ft260_dbg("rep %#02x addr %#02x cmd %#02x datlen %d replen %d\n", + rep->report, addr, cmd, rep->length, len); + + ret = ft260_hid_output_report_check_status(dev, (u8 *)rep, len); + + return ret; +} + +static int ft260_i2c_read(struct ft260_device *dev, u8 addr, u8 *data, + u16 len, u8 flag) +{ + u16 rd_len; + u16 rd_data_max = 60; + int timeout, ret = 0; + struct ft260_i2c_read_request_report rep; + struct hid_device *hdev = dev->hdev; + u8 bus_busy = 0; + + if ((flag & FT260_FLAG_START_REPEATED) == FT260_FLAG_START_REPEATED) + flag = FT260_FLAG_START_REPEATED; + else + flag = FT260_FLAG_START; + do { + if (len <= rd_data_max) { + rd_len = len; + flag |= FT260_FLAG_STOP; + } else { + rd_len = rd_data_max; + } + rd_data_max = FT260_RD_DATA_MAX; + + rep.report = FT260_I2C_READ_REQ; + rep.length = cpu_to_le16(rd_len); + rep.address = addr; + rep.flag = flag; + + ft260_dbg("rep %#02x addr %#02x len %d rlen %d flag %#x\n", + rep.report, rep.address, len, rd_len, flag); + + reinit_completion(&dev->wait); + + dev->read_idx = 0; + dev->read_buf = data; + dev->read_len = rd_len; + + ret = ft260_hid_output_report(hdev, (u8 *)&rep, sizeof(rep)); + if (ret < 0) { + hid_err(hdev, "%s: failed with %d\n", __func__, ret); + goto ft260_i2c_read_exit; + } + + timeout = msecs_to_jiffies(5000); + if (!wait_for_completion_timeout(&dev->wait, timeout)) { + ret = -ETIMEDOUT; + ft260_i2c_reset(hdev); + goto ft260_i2c_read_exit; + } + + dev->read_buf = NULL; + + if (flag & FT260_FLAG_STOP) + bus_busy = FT260_I2C_STATUS_BUS_BUSY; + + ret = ft260_xfer_status(dev, bus_busy); + if (ret < 0) { + ret = -EIO; + ft260_i2c_reset(hdev); + goto ft260_i2c_read_exit; + } + + len -= rd_len; + data += rd_len; + flag = 0; + + } while (len > 0); + +ft260_i2c_read_exit: + dev->read_buf = NULL; + return ret; +} + +/* + * A random read operation is implemented as a dummy write operation, followed + * by a current address read operation. The dummy write operation is used to + * load the target byte address into the current byte address counter, from + * which the subsequent current address read operation then reads. + */ +static int ft260_i2c_write_read(struct ft260_device *dev, struct i2c_msg *msgs) +{ + int ret; + int wr_len = msgs[0].len; + int rd_len = msgs[1].len; + struct hid_device *hdev = dev->hdev; + u8 addr = msgs[0].addr; + u16 read_off = 0; + + if (wr_len > 2) { + hid_err(hdev, "%s: invalid wr_len: %d\n", __func__, wr_len); + return -EOPNOTSUPP; + } + + if (ft260_debug) { + if (wr_len == 2) + read_off = be16_to_cpu(*(__be16 *)msgs[0].buf); + else + read_off = *msgs[0].buf; + + pr_info("%s: off %#x rlen %d wlen %d\n", __func__, + read_off, rd_len, wr_len); + } + + ret = ft260_i2c_write(dev, addr, msgs[0].buf, wr_len, + FT260_FLAG_START); + if (ret < 0) + return ret; + + ret = ft260_i2c_read(dev, addr, msgs[1].buf, rd_len, + FT260_FLAG_START_STOP_REPEATED); + if (ret < 0) + return ret; + + return 0; +} + +static int ft260_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, + int num) +{ + int ret; + struct ft260_device *dev = i2c_get_adapdata(adapter); + struct hid_device *hdev = dev->hdev; + + mutex_lock(&dev->lock); + + ret = hid_hw_power(hdev, PM_HINT_FULLON); + if (ret < 0) { + hid_err(hdev, "failed to enter FULLON power mode: %d\n", ret); + mutex_unlock(&dev->lock); + return ret; + } + + if (num == 1) { + if (msgs->flags & I2C_M_RD) + ret = ft260_i2c_read(dev, msgs->addr, msgs->buf, + msgs->len, FT260_FLAG_START_STOP); + else + ret = ft260_i2c_write(dev, msgs->addr, msgs->buf, + msgs->len, FT260_FLAG_START_STOP); + if (ret < 0) + goto i2c_exit; + + } else { + /* Combined write then read message */ + ret = ft260_i2c_write_read(dev, msgs); + if (ret < 0) + goto i2c_exit; + } + + ret = num; +i2c_exit: + hid_hw_power(hdev, PM_HINT_NORMAL); + mutex_unlock(&dev->lock); + return ret; +} + +static int ft260_smbus_xfer(struct i2c_adapter *adapter, u16 addr, u16 flags, + char read_write, u8 cmd, int size, + union i2c_smbus_data *data) +{ + int ret; + struct ft260_device *dev = i2c_get_adapdata(adapter); + struct hid_device *hdev = dev->hdev; + + ft260_dbg("smbus size %d\n", size); + + mutex_lock(&dev->lock); + + ret = hid_hw_power(hdev, PM_HINT_FULLON); + if (ret < 0) { + hid_err(hdev, "power management error: %d\n", ret); + mutex_unlock(&dev->lock); + return ret; + } + + switch (size) { + case I2C_SMBUS_BYTE: + if (read_write == I2C_SMBUS_READ) + ret = ft260_i2c_read(dev, addr, &data->byte, 1, + FT260_FLAG_START_STOP); + else + ret = ft260_smbus_write(dev, addr, cmd, NULL, 0, + FT260_FLAG_START_STOP); + break; + case I2C_SMBUS_BYTE_DATA: + if (read_write == I2C_SMBUS_READ) { + ret = ft260_smbus_write(dev, addr, cmd, NULL, 0, + FT260_FLAG_START); + if (ret) + goto smbus_exit; + + ret = ft260_i2c_read(dev, addr, &data->byte, 1, + FT260_FLAG_START_STOP_REPEATED); + } else { + ret = ft260_smbus_write(dev, addr, cmd, &data->byte, 1, + FT260_FLAG_START_STOP); + } + break; + case I2C_SMBUS_WORD_DATA: + if (read_write == I2C_SMBUS_READ) { + ret = ft260_smbus_write(dev, addr, cmd, NULL, 0, + FT260_FLAG_START); + if (ret) + goto smbus_exit; + + ret = ft260_i2c_read(dev, addr, (u8 *)&data->word, 2, + FT260_FLAG_START_STOP_REPEATED); + } else { + ret = ft260_smbus_write(dev, addr, cmd, + (u8 *)&data->word, 2, + FT260_FLAG_START_STOP); + } + break; + case I2C_SMBUS_BLOCK_DATA: + if (read_write == I2C_SMBUS_READ) { + ret = ft260_smbus_write(dev, addr, cmd, NULL, 0, + FT260_FLAG_START); + if (ret) + goto smbus_exit; + + ret = ft260_i2c_read(dev, addr, data->block, + data->block[0] + 1, + FT260_FLAG_START_STOP_REPEATED); + } else { + ret = ft260_smbus_write(dev, addr, cmd, data->block, + data->block[0] + 1, + FT260_FLAG_START_STOP); + } + break; + case I2C_SMBUS_I2C_BLOCK_DATA: + if (read_write == I2C_SMBUS_READ) { + ret = ft260_smbus_write(dev, addr, cmd, NULL, 0, + FT260_FLAG_START); + if (ret) + goto smbus_exit; + + ret = ft260_i2c_read(dev, addr, data->block + 1, + data->block[0], + FT260_FLAG_START_STOP_REPEATED); + } else { + ret = ft260_smbus_write(dev, addr, cmd, data->block + 1, + data->block[0], + FT260_FLAG_START_STOP); + } + break; + default: + hid_err(hdev, "unsupported smbus transaction size %d\n", size); + ret = -EOPNOTSUPP; + } + +smbus_exit: + hid_hw_power(hdev, PM_HINT_NORMAL); + mutex_unlock(&dev->lock); + return ret; +} + +static u32 ft260_functionality(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_BYTE | + I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | + I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_I2C_BLOCK; +} + +static const struct i2c_adapter_quirks ft260_i2c_quirks = { + .flags = I2C_AQ_COMB_WRITE_THEN_READ, + .max_comb_1st_msg_len = 2, +}; + +static const struct i2c_algorithm ft260_i2c_algo = { + .master_xfer = ft260_i2c_xfer, + .smbus_xfer = ft260_smbus_xfer, + .functionality = ft260_functionality, +}; + +static int ft260_get_system_config(struct hid_device *hdev, + struct ft260_get_system_status_report *cfg) +{ + int ret; + int len = sizeof(struct ft260_get_system_status_report); + + ret = ft260_hid_feature_report_get(hdev, FT260_SYSTEM_SETTINGS, + (u8 *)cfg, len); + if (ret < 0) { + hid_err(hdev, "failed to retrieve system status\n"); + return ret; + } + return 0; +} + +static int ft260_is_interface_enabled(struct hid_device *hdev) +{ + struct ft260_get_system_status_report cfg; + struct usb_interface *usbif = to_usb_interface(hdev->dev.parent); + int interface = usbif->cur_altsetting->desc.bInterfaceNumber; + int ret; + + ret = ft260_get_system_config(hdev, &cfg); + if (ret < 0) + return ret; + + ft260_dbg("interface: 0x%02x\n", interface); + ft260_dbg("chip mode: 0x%02x\n", cfg.chip_mode); + ft260_dbg("clock_ctl: 0x%02x\n", cfg.clock_ctl); + ft260_dbg("i2c_enable: 0x%02x\n", cfg.i2c_enable); + ft260_dbg("uart_mode: 0x%02x\n", cfg.uart_mode); + + switch (cfg.chip_mode) { + case FT260_MODE_ALL: + case FT260_MODE_BOTH: + if (interface == 1) + hid_info(hdev, "uart interface is not supported\n"); + else + ret = 1; + break; + case FT260_MODE_UART: + hid_info(hdev, "uart interface is not supported\n"); + break; + case FT260_MODE_I2C: + ret = 1; + break; + } + return ret; +} + +static int ft260_byte_show(struct hid_device *hdev, int id, u8 *cfg, int len, + u8 *field, u8 *buf) +{ + int ret; + + ret = ft260_hid_feature_report_get(hdev, id, cfg, len); + if (ret < 0) + return ret; + + return scnprintf(buf, PAGE_SIZE, "%d\n", *field); +} + +static int ft260_word_show(struct hid_device *hdev, int id, u8 *cfg, int len, + __le16 *field, u8 *buf) +{ + int ret; + + ret = ft260_hid_feature_report_get(hdev, id, cfg, len); + if (ret < 0) + return ret; + + return scnprintf(buf, PAGE_SIZE, "%d\n", le16_to_cpu(*field)); +} + +#define FT260_ATTR_SHOW(name, reptype, id, type, func) \ + static ssize_t name##_show(struct device *kdev, \ + struct device_attribute *attr, char *buf) \ + { \ + struct reptype rep; \ + struct hid_device *hdev = to_hid_device(kdev); \ + type *field = &rep.name; \ + int len = sizeof(rep); \ + \ + return func(hdev, id, (u8 *)&rep, len, field, buf); \ + } + +#define FT260_SSTAT_ATTR_SHOW(name) \ + FT260_ATTR_SHOW(name, ft260_get_system_status_report, \ + FT260_SYSTEM_SETTINGS, u8, ft260_byte_show) + +#define FT260_I2CST_ATTR_SHOW(name) \ + FT260_ATTR_SHOW(name, ft260_get_i2c_status_report, \ + FT260_I2C_STATUS, __le16, ft260_word_show) + +#define FT260_ATTR_STORE(name, reptype, id, req, type, ctype, func) \ + static ssize_t name##_store(struct device *kdev, \ + struct device_attribute *attr, \ + const char *buf, size_t count) \ + { \ + struct reptype rep; \ + struct hid_device *hdev = to_hid_device(kdev); \ + type name; \ + int ret; \ + \ + if (!func(buf, 10, (ctype *)&name)) { \ + rep.name = name; \ + rep.report = id; \ + rep.request = req; \ + ret = ft260_hid_feature_report_set(hdev, (u8 *)&rep, \ + sizeof(rep)); \ + if (!ret) \ + ret = count; \ + } else { \ + ret = -EINVAL; \ + } \ + return ret; \ + } + +#define FT260_BYTE_ATTR_STORE(name, reptype, req) \ + FT260_ATTR_STORE(name, reptype, FT260_SYSTEM_SETTINGS, req, \ + u8, u8, kstrtou8) + +#define FT260_WORD_ATTR_STORE(name, reptype, req) \ + FT260_ATTR_STORE(name, reptype, FT260_SYSTEM_SETTINGS, req, \ + __le16, u16, kstrtou16) + +FT260_SSTAT_ATTR_SHOW(chip_mode); +static DEVICE_ATTR_RO(chip_mode); + +FT260_SSTAT_ATTR_SHOW(pwren_status); +static DEVICE_ATTR_RO(pwren_status); + +FT260_SSTAT_ATTR_SHOW(suspend_status); +static DEVICE_ATTR_RO(suspend_status); + +FT260_SSTAT_ATTR_SHOW(hid_over_i2c_en); +static DEVICE_ATTR_RO(hid_over_i2c_en); + +FT260_SSTAT_ATTR_SHOW(power_saving_en); +static DEVICE_ATTR_RO(power_saving_en); + +FT260_SSTAT_ATTR_SHOW(i2c_enable); +FT260_BYTE_ATTR_STORE(i2c_enable, ft260_set_i2c_mode_report, + FT260_SET_I2C_MODE); +static DEVICE_ATTR_RW(i2c_enable); + +FT260_SSTAT_ATTR_SHOW(uart_mode); +FT260_BYTE_ATTR_STORE(uart_mode, ft260_set_uart_mode_report, + FT260_SET_UART_MODE); +static DEVICE_ATTR_RW(uart_mode); + +FT260_SSTAT_ATTR_SHOW(clock_ctl); +FT260_BYTE_ATTR_STORE(clock_ctl, ft260_set_system_clock_report, + FT260_SET_CLOCK); +static DEVICE_ATTR_RW(clock_ctl); + +FT260_I2CST_ATTR_SHOW(clock); +FT260_WORD_ATTR_STORE(clock, ft260_set_i2c_speed_report, + FT260_SET_I2C_CLOCK_SPEED); +static DEVICE_ATTR_RW(clock); + +static ssize_t i2c_reset_store(struct device *kdev, + struct device_attribute *attr, const char *buf, + size_t count) +{ + struct hid_device *hdev = to_hid_device(kdev); + int ret = ft260_i2c_reset(hdev); + + if (ret) + return ret; + return count; +} +static DEVICE_ATTR_WO(i2c_reset); + +static const struct attribute_group ft260_attr_group = { + .attrs = (struct attribute *[]) { + &dev_attr_chip_mode.attr, + &dev_attr_pwren_status.attr, + &dev_attr_suspend_status.attr, + &dev_attr_hid_over_i2c_en.attr, + &dev_attr_power_saving_en.attr, + &dev_attr_i2c_enable.attr, + &dev_attr_uart_mode.attr, + &dev_attr_clock_ctl.attr, + &dev_attr_i2c_reset.attr, + &dev_attr_clock.attr, + NULL + } +}; + +static int ft260_probe(struct hid_device *hdev, const struct hid_device_id *id) +{ + struct ft260_device *dev; + struct ft260_get_chip_version_report version; + int ret; + + if (!hid_is_usb(hdev)) + return -EINVAL; + + dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL); + if (!dev) + return -ENOMEM; + + ret = hid_parse(hdev); + if (ret) { + hid_err(hdev, "failed to parse HID\n"); + return ret; + } + + ret = hid_hw_start(hdev, 0); + if (ret) { + hid_err(hdev, "failed to start HID HW\n"); + return ret; + } + + ret = hid_hw_open(hdev); + if (ret) { + hid_err(hdev, "failed to open HID HW\n"); + goto err_hid_stop; + } + + ret = ft260_hid_feature_report_get(hdev, FT260_CHIP_VERSION, + (u8 *)&version, sizeof(version)); + if (ret < 0) { + hid_err(hdev, "failed to retrieve chip version\n"); + goto err_hid_close; + } + + hid_info(hdev, "chip code: %02x%02x %02x%02x\n", + version.chip_code[0], version.chip_code[1], + version.chip_code[2], version.chip_code[3]); + + ret = ft260_is_interface_enabled(hdev); + if (ret <= 0) + goto err_hid_close; + + hid_info(hdev, "USB HID v%x.%02x Device [%s] on %s\n", + hdev->version >> 8, hdev->version & 0xff, hdev->name, + hdev->phys); + + hid_set_drvdata(hdev, dev); + dev->hdev = hdev; + dev->adap.owner = THIS_MODULE; + dev->adap.class = I2C_CLASS_HWMON; + dev->adap.algo = &ft260_i2c_algo; + dev->adap.quirks = &ft260_i2c_quirks; + dev->adap.dev.parent = &hdev->dev; + snprintf(dev->adap.name, sizeof(dev->adap.name), + "FT260 usb-i2c bridge"); + + mutex_init(&dev->lock); + init_completion(&dev->wait); + + ret = ft260_xfer_status(dev, FT260_I2C_STATUS_BUS_BUSY); + if (ret) + ft260_i2c_reset(hdev); + + i2c_set_adapdata(&dev->adap, dev); + ret = i2c_add_adapter(&dev->adap); + if (ret) { + hid_err(hdev, "failed to add i2c adapter\n"); + goto err_hid_close; + } + + ret = sysfs_create_group(&hdev->dev.kobj, &ft260_attr_group); + if (ret < 0) { + hid_err(hdev, "failed to create sysfs attrs\n"); + goto err_i2c_free; + } + + return 0; + +err_i2c_free: + i2c_del_adapter(&dev->adap); +err_hid_close: + hid_hw_close(hdev); +err_hid_stop: + hid_hw_stop(hdev); + return ret; +} + +static void ft260_remove(struct hid_device *hdev) +{ + struct ft260_device *dev = hid_get_drvdata(hdev); + + if (!dev) + return; + + sysfs_remove_group(&hdev->dev.kobj, &ft260_attr_group); + i2c_del_adapter(&dev->adap); + + hid_hw_close(hdev); + hid_hw_stop(hdev); +} + +static int ft260_raw_event(struct hid_device *hdev, struct hid_report *report, + u8 *data, int size) +{ + struct ft260_device *dev = hid_get_drvdata(hdev); + struct ft260_i2c_input_report *xfer = (void *)data; + + if (xfer->report >= FT260_I2C_REPORT_MIN && + xfer->report <= FT260_I2C_REPORT_MAX) { + ft260_dbg("i2c resp: rep %#02x len %d\n", xfer->report, + xfer->length); + + if ((dev->read_buf == NULL) || + (xfer->length > dev->read_len - dev->read_idx)) { + hid_err(hdev, "unexpected report %#02x, length %d\n", + xfer->report, xfer->length); + return -1; + } + + memcpy(&dev->read_buf[dev->read_idx], &xfer->data, + xfer->length); + dev->read_idx += xfer->length; + + if (dev->read_idx == dev->read_len) + complete(&dev->wait); + + } else { + hid_err(hdev, "unhandled report %#02x\n", xfer->report); + } + return 0; +} + +static struct hid_driver ft260_driver = { + .name = "ft260", + .id_table = ft260_devices, + .probe = ft260_probe, + .remove = ft260_remove, + .raw_event = ft260_raw_event, +}; + +module_hid_driver(ft260_driver); +MODULE_DESCRIPTION("FTDI FT260 USB HID to I2C host bridge"); +MODULE_AUTHOR("Michael Zaidman "); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3