1 // SPDX-License-Identifier: GPL-2.0
3   Some of this code is credited to Linux USB open source files that are
13 #include <linux/usb.h>
21 #include <linux/usb/serial.h>
23 #define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver"
52 MODULE_DEVICE_TABLE(usb, id_table);
54 /* UNI-Directional mode commands for device configure */
58 static int metrousb_is_unidirectional_mode(struct usb_serial *serial)  in metrousb_is_unidirectional_mode()  argument
60 	u16 product_id = le16_to_cpu(serial->dev->descriptor.idProduct);  in metrousb_is_unidirectional_mode()
65 static int metrousb_calc_num_ports(struct usb_serial *serial,  in metrousb_calc_num_ports()  argument
68 	if (metrousb_is_unidirectional_mode(serial)) {  in metrousb_calc_num_ports()
69 		if (epds->num_interrupt_out == 0) {  in metrousb_calc_num_ports()
70 			dev_err(&serial->interface->dev, "interrupt-out endpoint missing\n");  in metrousb_calc_num_ports()
71 			return -ENODEV;  in metrousb_calc_num_ports()
84 	if (!metrousb_is_unidirectional_mode(port->serial))  in metrousb_send_unidirectional_cmd()
89 		return -ENOMEM;  in metrousb_send_unidirectional_cmd()
93 	ret = usb_interrupt_msg(port->serial->dev,  in metrousb_send_unidirectional_cmd()
94 		usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),  in metrousb_send_unidirectional_cmd()
103 		return -EIO;  in metrousb_send_unidirectional_cmd()
109 	struct usb_serial_port *port = urb->context;  in metrousb_read_int_callback()
111 	unsigned char *data = urb->transfer_buffer;  in metrousb_read_int_callback()
116 	dev_dbg(&port->dev, "%s\n", __func__);  in metrousb_read_int_callback()
118 	switch (urb->status) {  in metrousb_read_int_callback()
122 	case -ECONNRESET:  in metrousb_read_int_callback()
123 	case -ENOENT:  in metrousb_read_int_callback()
124 	case -ESHUTDOWN:  in metrousb_read_int_callback()
126 		dev_dbg(&port->dev,  in metrousb_read_int_callback()
127 			"%s - urb shutting down, error code=%d\n",  in metrousb_read_int_callback()
128 			__func__, urb->status);  in metrousb_read_int_callback()
131 		dev_dbg(&port->dev,  in metrousb_read_int_callback()
132 			"%s - non-zero urb received, error code=%d\n",  in metrousb_read_int_callback()
133 			__func__, urb->status);  in metrousb_read_int_callback()
138 	/* Set the data read from the usb port into the serial port buffer. */  in metrousb_read_int_callback()
139 	if (urb->actual_length) {  in metrousb_read_int_callback()
140 		/* Loop through the data copying each byte to the tty layer. */  in metrousb_read_int_callback()
141 		tty_insert_flip_string(&port->port, data, urb->actual_length);  in metrousb_read_int_callback()
143 		/* Force the data to the tty layer. */  in metrousb_read_int_callback()
144 		tty_flip_buffer_push(&port->port);  in metrousb_read_int_callback()
148 	spin_lock_irqsave(&metro_priv->lock, flags);  in metrousb_read_int_callback()
149 	throttled = metro_priv->throttled;  in metrousb_read_int_callback()
150 	spin_unlock_irqrestore(&metro_priv->lock, flags);  in metrousb_read_int_callback()
155 	/* Try to resubmit the urb. */  in metrousb_read_int_callback()
158 		dev_err(&port->dev,  in metrousb_read_int_callback()
159 			"%s - failed submitting interrupt in urb, error code=%d\n",  in metrousb_read_int_callback()
165 	usb_kill_urb(port->interrupt_in_urb);  in metrousb_cleanup()
172 	struct usb_serial *serial = port->serial;  in metrousb_open()  local
178 	spin_lock_irqsave(&metro_priv->lock, flags);  in metrousb_open()
179 	metro_priv->control_state = 0;  in metrousb_open()
180 	metro_priv->throttled = 0;  in metrousb_open()
181 	spin_unlock_irqrestore(&metro_priv->lock, flags);  in metrousb_open()
184 	usb_clear_halt(serial->dev, port->interrupt_in_urb->pipe);  in metrousb_open()
187 	usb_fill_int_urb(port->interrupt_in_urb, serial->dev,  in metrousb_open()
188 			  usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),  in metrousb_open()
189 			   port->interrupt_in_urb->transfer_buffer,  in metrousb_open()
190 			   port->interrupt_in_urb->transfer_buffer_length,  in metrousb_open()
192 	result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);  in metrousb_open()
195 		dev_err(&port->dev,  in metrousb_open()
196 			"%s - failed submitting interrupt in urb, error code=%d\n",  in metrousb_open()
201 	/* Send activate cmd to device */  in metrousb_open()
204 		dev_err(&port->dev,  in metrousb_open()
205 			"%s - failed to configure device, error code=%d\n",  in metrousb_open()
213 	usb_kill_urb(port->interrupt_in_urb);  in metrousb_open()
218 static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int control_state)  in metrousb_set_modem_ctrl()  argument
223 	dev_dbg(&serial->dev->dev, "%s - control state = %d\n",  in metrousb_set_modem_ctrl()
232 	/* Send the command to the usb port. */  in metrousb_set_modem_ctrl()
233 	retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),  in metrousb_set_modem_ctrl()
237 		dev_err(&serial->dev->dev,  in metrousb_set_modem_ctrl()
238 			"%s - set modem ctrl=0x%x failed, error code=%d\n",  in metrousb_set_modem_ctrl()
250 		return -ENOMEM;  in metrousb_port_probe()
252 	spin_lock_init(&metro_priv->lock);  in metrousb_port_probe()
269 	struct usb_serial_port *port = tty->driver_data;  in metrousb_throttle()
273 	/* Set the private information for the port to stop reading data. */  in metrousb_throttle()
274 	spin_lock_irqsave(&metro_priv->lock, flags);  in metrousb_throttle()
275 	metro_priv->throttled = 1;  in metrousb_throttle()
276 	spin_unlock_irqrestore(&metro_priv->lock, flags);  in metrousb_throttle()
282 	struct usb_serial_port *port = tty->driver_data;  in metrousb_tiocmget()
286 	spin_lock_irqsave(&metro_priv->lock, flags);  in metrousb_tiocmget()
287 	control_state = metro_priv->control_state;  in metrousb_tiocmget()
288 	spin_unlock_irqrestore(&metro_priv->lock, flags);  in metrousb_tiocmget()
296 	struct usb_serial_port *port = tty->driver_data;  in metrousb_tiocmset()
297 	struct usb_serial *serial = port->serial;  in metrousb_tiocmset()  local
302 	dev_dbg(&port->dev, "%s - set=%d, clear=%d\n", __func__, set, clear);  in metrousb_tiocmset()
304 	spin_lock_irqsave(&metro_priv->lock, flags);  in metrousb_tiocmset()
305 	control_state = metro_priv->control_state;  in metrousb_tiocmset()
317 	metro_priv->control_state = control_state;  in metrousb_tiocmset()
318 	spin_unlock_irqrestore(&metro_priv->lock, flags);  in metrousb_tiocmset()
319 	return metrousb_set_modem_ctrl(serial, control_state);  in metrousb_tiocmset()
324 	struct usb_serial_port *port = tty->driver_data;  in metrousb_unthrottle()
329 	/* Set the private information for the port to resume reading data. */  in metrousb_unthrottle()
330 	spin_lock_irqsave(&metro_priv->lock, flags);  in metrousb_unthrottle()
331 	metro_priv->throttled = 0;  in metrousb_unthrottle()
332 	spin_unlock_irqrestore(&metro_priv->lock, flags);  in metrousb_unthrottle()
334 	/* Submit the urb to read from the port. */  in metrousb_unthrottle()
335 	result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);  in metrousb_unthrottle()
337 		dev_err(&port->dev,  in metrousb_unthrottle()
344 		.name =		"metro-usb",
346 	.description		= "Metrologic USB to Serial",