diff options
author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-04-03 16:59:34 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-04-03 16:59:34 (GMT) |
commit | 3510c8164ccbda7150379900f71078ce6ab23550 (patch) | |
tree | 1828ee2176371238090f349c909e1a259273800c | |
parent | 8b86ed078a65433a60ff59091a136d23724bd6d3 (diff) | |
parent | 65dd82ae453f5290be0ea83ed0f23163ea49c0eb (diff) | |
download | linux-3510c8164ccbda7150379900f71078ce6ab23550.tar.xz |
Merge tag 'usb-serial-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial into usb-next
Johan writes:
USB-serial updates for v4.1-rc1
Fix up the f81232 driver, which up to this point has mostly been a
placeholder without a proper implementation.
Included is also a minor clean up of ch341.
Signed-off-by: Johan Hovold <johan@kernel.org>
-rw-r--r-- | drivers/usb/serial/ch341.c | 1 | ||||
-rw-r--r-- | drivers/usb/serial/f81232.c | 558 |
2 files changed, 459 insertions, 100 deletions
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c index ede4f5f..c73808f 100644 --- a/drivers/usb/serial/ch341.c +++ b/drivers/usb/serial/ch341.c @@ -325,7 +325,6 @@ static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port) if (r) { dev_err(&port->dev, "%s - failed to submit interrupt urb: %d\n", __func__, r); - ch341_close(port); goto out; } diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c index c5dc233..972f5a5 100644 --- a/drivers/usb/serial/f81232.c +++ b/drivers/usb/serial/f81232.c @@ -19,10 +19,11 @@ #include <linux/serial.h> #include <linux/module.h> #include <linux/moduleparam.h> -#include <linux/spinlock.h> +#include <linux/mutex.h> #include <linux/uaccess.h> #include <linux/usb.h> #include <linux/usb/serial.h> +#include <linux/serial_reg.h> static const struct usb_device_id id_table[] = { { USB_DEVICE(0x1934, 0x0706) }, @@ -30,37 +31,218 @@ static const struct usb_device_id id_table[] = { }; MODULE_DEVICE_TABLE(usb, id_table); -#define CONTROL_DTR 0x01 -#define CONTROL_RTS 0x02 +/* Maximum baudrate for F81232 */ +#define F81232_MAX_BAUDRATE 115200 -#define UART_STATE 0x08 -#define UART_STATE_TRANSIENT_MASK 0x74 -#define UART_DCD 0x01 -#define UART_DSR 0x02 -#define UART_BREAK_ERROR 0x04 -#define UART_RING 0x08 -#define UART_FRAME_ERROR 0x10 -#define UART_PARITY_ERROR 0x20 -#define UART_OVERRUN_ERROR 0x40 -#define UART_CTS 0x80 +/* USB Control EP parameter */ +#define F81232_REGISTER_REQUEST 0xa0 +#define F81232_GET_REGISTER 0xc0 +#define F81232_SET_REGISTER 0x40 + +#define SERIAL_BASE_ADDRESS 0x0120 +#define RECEIVE_BUFFER_REGISTER (0x00 + SERIAL_BASE_ADDRESS) +#define INTERRUPT_ENABLE_REGISTER (0x01 + SERIAL_BASE_ADDRESS) +#define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS) +#define LINE_CONTROL_REGISTER (0x03 + SERIAL_BASE_ADDRESS) +#define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS) +#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS) struct f81232_private { - spinlock_t lock; - u8 line_control; - u8 line_status; + struct mutex lock; + u8 modem_control; + u8 modem_status; + struct work_struct interrupt_work; + struct usb_serial_port *port; }; +static int calc_baud_divisor(speed_t baudrate) +{ + return DIV_ROUND_CLOSEST(F81232_MAX_BAUDRATE, baudrate); +} + +static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val) +{ + int status; + u8 *tmp; + struct usb_device *dev = port->serial->dev; + + tmp = kmalloc(sizeof(*val), GFP_KERNEL); + if (!tmp) + return -ENOMEM; + + status = usb_control_msg(dev, + usb_rcvctrlpipe(dev, 0), + F81232_REGISTER_REQUEST, + F81232_GET_REGISTER, + reg, + 0, + tmp, + sizeof(*val), + USB_CTRL_GET_TIMEOUT); + if (status != sizeof(*val)) { + dev_err(&port->dev, "%s failed status: %d\n", __func__, status); + + if (status < 0) + status = usb_translate_errors(status); + else + status = -EIO; + } else { + status = 0; + *val = *tmp; + } + + kfree(tmp); + return status; +} + +static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val) +{ + int status; + u8 *tmp; + struct usb_device *dev = port->serial->dev; + + tmp = kmalloc(sizeof(val), GFP_KERNEL); + if (!tmp) + return -ENOMEM; + + *tmp = val; + + status = usb_control_msg(dev, + usb_sndctrlpipe(dev, 0), + F81232_REGISTER_REQUEST, + F81232_SET_REGISTER, + reg, + 0, + tmp, + sizeof(val), + USB_CTRL_SET_TIMEOUT); + if (status != sizeof(val)) { + dev_err(&port->dev, "%s failed status: %d\n", __func__, status); + + if (status < 0) + status = usb_translate_errors(status); + else + status = -EIO; + } else { + status = 0; + } + + kfree(tmp); + return status; +} + +static void f81232_read_msr(struct usb_serial_port *port) +{ + int status; + u8 current_msr; + struct tty_struct *tty; + struct f81232_private *priv = usb_get_serial_port_data(port); + + mutex_lock(&priv->lock); + status = f81232_get_register(port, MODEM_STATUS_REGISTER, + ¤t_msr); + if (status) { + dev_err(&port->dev, "%s fail, status: %d\n", __func__, status); + mutex_unlock(&priv->lock); + return; + } + + if (!(current_msr & UART_MSR_ANY_DELTA)) { + mutex_unlock(&priv->lock); + return; + } + + priv->modem_status = current_msr; + + if (current_msr & UART_MSR_DCTS) + port->icount.cts++; + if (current_msr & UART_MSR_DDSR) + port->icount.dsr++; + if (current_msr & UART_MSR_TERI) + port->icount.rng++; + if (current_msr & UART_MSR_DDCD) { + port->icount.dcd++; + tty = tty_port_tty_get(&port->port); + if (tty) { + usb_serial_handle_dcd_change(port, tty, + current_msr & UART_MSR_DCD); + + tty_kref_put(tty); + } + } + + wake_up_interruptible(&port->port.delta_msr_wait); + mutex_unlock(&priv->lock); +} + +static int f81232_set_mctrl(struct usb_serial_port *port, + unsigned int set, unsigned int clear) +{ + u8 val; + int status; + struct f81232_private *priv = usb_get_serial_port_data(port); + + if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) + return 0; /* no change */ + + /* 'set' takes precedence over 'clear' */ + clear &= ~set; + + /* force enable interrupt with OUT2 */ + mutex_lock(&priv->lock); + val = UART_MCR_OUT2 | priv->modem_control; + + if (clear & TIOCM_DTR) + val &= ~UART_MCR_DTR; + + if (clear & TIOCM_RTS) + val &= ~UART_MCR_RTS; + + if (set & TIOCM_DTR) + val |= UART_MCR_DTR; + + if (set & TIOCM_RTS) + val |= UART_MCR_RTS; + + dev_dbg(&port->dev, "%s new:%02x old:%02x\n", __func__, + val, priv->modem_control); + + status = f81232_set_register(port, MODEM_CONTROL_REGISTER, val); + if (status) { + dev_err(&port->dev, "%s set MCR status < 0\n", __func__); + mutex_unlock(&priv->lock); + return status; + } + + priv->modem_control = val; + mutex_unlock(&priv->lock); + + return 0; +} + static void f81232_update_line_status(struct usb_serial_port *port, unsigned char *data, - unsigned int actual_length) + size_t actual_length) { - /* - * FIXME: Update port->icount, and call - * - * wake_up_interruptible(&port->port.delta_msr_wait); - * - * on MSR changes. - */ + struct f81232_private *priv = usb_get_serial_port_data(port); + + if (!actual_length) + return; + + switch (data[0] & 0x07) { + case 0x00: /* msr change */ + dev_dbg(&port->dev, "IIR: MSR Change: %02x\n", data[0]); + schedule_work(&priv->interrupt_work); + break; + case 0x02: /* tx-empty */ + break; + case 0x04: /* rx data available */ + break; + case 0x06: /* lsr change */ + /* we can forget it. the LSR will read from bulk-in */ + dev_dbg(&port->dev, "IIR: LSR Change: %02x\n", data[0]); + break; + } } static void f81232_read_int_callback(struct urb *urb) @@ -104,55 +286,55 @@ exit: static void f81232_process_read_urb(struct urb *urb) { struct usb_serial_port *port = urb->context; - struct f81232_private *priv = usb_get_serial_port_data(port); unsigned char *data = urb->transfer_buffer; - char tty_flag = TTY_NORMAL; - unsigned long flags; - u8 line_status; - int i; - - /* update line status */ - spin_lock_irqsave(&priv->lock, flags); - line_status = priv->line_status; - priv->line_status &= ~UART_STATE_TRANSIENT_MASK; - spin_unlock_irqrestore(&priv->lock, flags); - - if (!urb->actual_length) + char tty_flag; + unsigned int i; + u8 lsr; + + /* + * When opening the port we get a 1-byte packet with the current LSR, + * which we discard. + */ + if ((urb->actual_length < 2) || (urb->actual_length % 2)) return; - /* break takes precedence over parity, */ - /* which takes precedence over framing errors */ - if (line_status & UART_BREAK_ERROR) - tty_flag = TTY_BREAK; - else if (line_status & UART_PARITY_ERROR) - tty_flag = TTY_PARITY; - else if (line_status & UART_FRAME_ERROR) - tty_flag = TTY_FRAME; - dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, tty_flag); - - /* overrun is special, not associated with a char */ - if (line_status & UART_OVERRUN_ERROR) - tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); - - if (port->port.console && port->sysrq) { - for (i = 0; i < urb->actual_length; ++i) - if (!usb_serial_handle_sysrq_char(port, data[i])) - tty_insert_flip_char(&port->port, data[i], - tty_flag); - } else { - tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag, - urb->actual_length); + /* bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... */ + + for (i = 0; i < urb->actual_length; i += 2) { + tty_flag = TTY_NORMAL; + lsr = data[i]; + + if (lsr & UART_LSR_BRK_ERROR_BITS) { + if (lsr & UART_LSR_BI) { + tty_flag = TTY_BREAK; + port->icount.brk++; + usb_serial_handle_break(port); + } else if (lsr & UART_LSR_PE) { + tty_flag = TTY_PARITY; + port->icount.parity++; + } else if (lsr & UART_LSR_FE) { + tty_flag = TTY_FRAME; + port->icount.frame++; + } + + if (lsr & UART_LSR_OE) { + port->icount.overrun++; + tty_insert_flip_char(&port->port, 0, + TTY_OVERRUN); + } + } + + if (port->port.console && port->sysrq) { + if (usb_serial_handle_sysrq_char(port, data[i + 1])) + continue; + } + + tty_insert_flip_char(&port->port, data[i + 1], tty_flag); } tty_flip_buffer_push(&port->port); } -static int set_control_lines(struct usb_device *dev, u8 value) -{ - /* FIXME - Stubbed out for now */ - return 0; -} - static void f81232_break_ctl(struct tty_struct *tty, int break_state) { /* FIXME - Stubbed out for now */ @@ -164,37 +346,198 @@ static void f81232_break_ctl(struct tty_struct *tty, int break_state) */ } +static void f81232_set_baudrate(struct usb_serial_port *port, speed_t baudrate) +{ + u8 lcr; + int divisor; + int status = 0; + + divisor = calc_baud_divisor(baudrate); + + status = f81232_get_register(port, LINE_CONTROL_REGISTER, + &lcr); /* get LCR */ + if (status) { + dev_err(&port->dev, "%s failed to get LCR: %d\n", + __func__, status); + return; + } + + status = f81232_set_register(port, LINE_CONTROL_REGISTER, + lcr | UART_LCR_DLAB); /* Enable DLAB */ + if (status) { + dev_err(&port->dev, "%s failed to set DLAB: %d\n", + __func__, status); + return; + } + + status = f81232_set_register(port, RECEIVE_BUFFER_REGISTER, + divisor & 0x00ff); /* low */ + if (status) { + dev_err(&port->dev, "%s failed to set baudrate MSB: %d\n", + __func__, status); + goto reapply_lcr; + } + + status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, + (divisor & 0xff00) >> 8); /* high */ + if (status) { + dev_err(&port->dev, "%s failed to set baudrate LSB: %d\n", + __func__, status); + } + +reapply_lcr: + status = f81232_set_register(port, LINE_CONTROL_REGISTER, + lcr & ~UART_LCR_DLAB); + if (status) { + dev_err(&port->dev, "%s failed to set DLAB: %d\n", + __func__, status); + } +} + +static int f81232_port_enable(struct usb_serial_port *port) +{ + u8 val; + int status; + + /* fifo on, trigger8, clear TX/RX*/ + val = UART_FCR_TRIGGER_8 | UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | + UART_FCR_CLEAR_XMIT; + + status = f81232_set_register(port, FIFO_CONTROL_REGISTER, val); + if (status) { + dev_err(&port->dev, "%s failed to set FCR: %d\n", + __func__, status); + return status; + } + + /* MSR Interrupt only, LSR will read from Bulk-in odd byte */ + status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, + UART_IER_MSI); + if (status) { + dev_err(&port->dev, "%s failed to set IER: %d\n", + __func__, status); + return status; + } + + return 0; +} + +static int f81232_port_disable(struct usb_serial_port *port) +{ + int status; + + status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, 0); + if (status) { + dev_err(&port->dev, "%s failed to set IER: %d\n", + __func__, status); + return status; + } + + return 0; +} + static void f81232_set_termios(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios) { - /* FIXME - Stubbed out for now */ + u8 new_lcr = 0; + int status = 0; + speed_t baudrate; /* Don't change anything if nothing has changed */ if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios)) return; - /* Do the real work here... */ - if (old_termios) - tty_termios_copy_hw(&tty->termios, old_termios); + if (C_BAUD(tty) == B0) + f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS); + else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) + f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0); + + baudrate = tty_get_baud_rate(tty); + if (baudrate > 0) { + if (baudrate > F81232_MAX_BAUDRATE) { + baudrate = F81232_MAX_BAUDRATE; + tty_encode_baud_rate(tty, baudrate, baudrate); + } + f81232_set_baudrate(port, baudrate); + } + + if (C_PARENB(tty)) { + new_lcr |= UART_LCR_PARITY; + + if (!C_PARODD(tty)) + new_lcr |= UART_LCR_EPAR; + + if (C_CMSPAR(tty)) + new_lcr |= UART_LCR_SPAR; + } + + if (C_CSTOPB(tty)) + new_lcr |= UART_LCR_STOP; + + switch (C_CSIZE(tty)) { + case CS5: + new_lcr |= UART_LCR_WLEN5; + break; + case CS6: + new_lcr |= UART_LCR_WLEN6; + break; + case CS7: + new_lcr |= UART_LCR_WLEN7; + break; + default: + case CS8: + new_lcr |= UART_LCR_WLEN8; + break; + } + + status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr); + if (status) { + dev_err(&port->dev, "%s failed to set LCR: %d\n", + __func__, status); + } } static int f81232_tiocmget(struct tty_struct *tty) { - /* FIXME - Stubbed out for now */ - return 0; + int r; + struct usb_serial_port *port = tty->driver_data; + struct f81232_private *port_priv = usb_get_serial_port_data(port); + u8 mcr, msr; + + /* force get current MSR changed state */ + f81232_read_msr(port); + + mutex_lock(&port_priv->lock); + mcr = port_priv->modem_control; + msr = port_priv->modem_status; + mutex_unlock(&port_priv->lock); + + r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) | + (mcr & UART_MCR_RTS ? TIOCM_RTS : 0) | + (msr & UART_MSR_CTS ? TIOCM_CTS : 0) | + (msr & UART_MSR_DCD ? TIOCM_CAR : 0) | + (msr & UART_MSR_RI ? TIOCM_RI : 0) | + (msr & UART_MSR_DSR ? TIOCM_DSR : 0); + + return r; } static int f81232_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) { - /* FIXME - Stubbed out for now */ - return 0; + struct usb_serial_port *port = tty->driver_data; + + return f81232_set_mctrl(port, set, clear); } static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port) { int result; + result = f81232_port_enable(port); + if (result) + return result; + /* Setup termios */ if (tty) f81232_set_termios(tty, port, NULL); @@ -217,59 +560,73 @@ static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port) static void f81232_close(struct usb_serial_port *port) { + f81232_port_disable(port); usb_serial_generic_close(port); usb_kill_urb(port->interrupt_in_urb); } static void f81232_dtr_rts(struct usb_serial_port *port, int on) { - struct f81232_private *priv = usb_get_serial_port_data(port); - unsigned long flags; - u8 control; - - spin_lock_irqsave(&priv->lock, flags); - /* Change DTR and RTS */ if (on) - priv->line_control |= (CONTROL_DTR | CONTROL_RTS); + f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0); else - priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); - control = priv->line_control; - spin_unlock_irqrestore(&priv->lock, flags); - set_control_lines(port->serial->dev, control); + f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS); } static int f81232_carrier_raised(struct usb_serial_port *port) { + u8 msr; struct f81232_private *priv = usb_get_serial_port_data(port); - if (priv->line_status & UART_DCD) + + mutex_lock(&priv->lock); + msr = priv->modem_status; + mutex_unlock(&priv->lock); + + if (msr & UART_MSR_DCD) return 1; return 0; } +static int f81232_get_serial_info(struct usb_serial_port *port, + unsigned long arg) +{ + struct serial_struct ser; + + memset(&ser, 0, sizeof(ser)); + + ser.type = PORT_16550A; + ser.line = port->minor; + ser.port = port->port_number; + ser.baud_base = F81232_MAX_BAUDRATE; + + if (copy_to_user((void __user *)arg, &ser, sizeof(ser))) + return -EFAULT; + + return 0; +} + static int f81232_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) { - struct serial_struct ser; struct usb_serial_port *port = tty->driver_data; switch (cmd) { case TIOCGSERIAL: - memset(&ser, 0, sizeof ser); - ser.type = PORT_16654; - ser.line = port->minor; - ser.port = port->port_number; - ser.baud_base = 460800; - - if (copy_to_user((void __user *)arg, &ser, sizeof ser)) - return -EFAULT; - - return 0; + return f81232_get_serial_info(port, arg); default: break; } return -ENOIOCTLCMD; } +static void f81232_interrupt_work(struct work_struct *work) +{ + struct f81232_private *priv = + container_of(work, struct f81232_private, interrupt_work); + + f81232_read_msr(priv->port); +} + static int f81232_port_probe(struct usb_serial_port *port) { struct f81232_private *priv; @@ -278,11 +635,13 @@ static int f81232_port_probe(struct usb_serial_port *port) if (!priv) return -ENOMEM; - spin_lock_init(&priv->lock); + mutex_init(&priv->lock); + INIT_WORK(&priv->interrupt_work, f81232_interrupt_work); usb_set_serial_port_data(port, priv); port->port.drain_delay = 256; + priv->port = port; return 0; } @@ -308,7 +667,7 @@ static struct usb_serial_driver f81232_device = { .bulk_out_size = 256, .open = f81232_open, .close = f81232_close, - .dtr_rts = f81232_dtr_rts, + .dtr_rts = f81232_dtr_rts, .carrier_raised = f81232_carrier_raised, .ioctl = f81232_ioctl, .break_ctl = f81232_break_ctl, @@ -330,5 +689,6 @@ static struct usb_serial_driver * const serial_drivers[] = { module_usb_serial_driver(serial_drivers, id_table); MODULE_DESCRIPTION("Fintek F81232 USB to serial adaptor driver"); -MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org"); +MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>"); +MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>"); MODULE_LICENSE("GPL v2"); |