Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Opticon USB barcode to serial driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2011 - 2012 Johan Hovold <jhovold@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (C) 2011 Martin Jansen <martin.jansen@opticon.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Copyright (C) 2008 - 2009 Greg Kroah-Hartman <gregkh@suse.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * Copyright (C) 2008 - 2009 Novell Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/tty.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/tty_driver.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/tty_flip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/serial.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/usb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/usb/serial.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define CONTROL_RTS			0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define RESEND_CTS_STATE	0x03
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) /* max number of write urbs in flight */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #define URB_UPPER_LIMIT	8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) /* This driver works for the Opticon 1D barcode reader
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  * an examples of 1D barcode types are EAN, UPC, Code39, IATA etc.. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define DRIVER_DESC	"Opticon USB barcode to serial driver (1D)"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) static const struct usb_device_id id_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	{ USB_DEVICE(0x065a, 0x0009) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	{ },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) MODULE_DEVICE_TABLE(usb, id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) /* This structure holds all of the individual device information */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) struct opticon_private {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	spinlock_t lock;	/* protects the following flags */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	bool rts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	bool cts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	int outstanding_urbs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	int outstanding_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	struct usb_anchor anchor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static void opticon_process_data_packet(struct usb_serial_port *port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 					const unsigned char *buf, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	tty_insert_flip_string(&port->port, buf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	tty_flip_buffer_push(&port->port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) static void opticon_process_status_packet(struct usb_serial_port *port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 					const unsigned char *buf, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	struct opticon_private *priv = usb_get_serial_port_data(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	spin_lock_irqsave(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	if (buf[0] == 0x00)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		priv->cts = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		priv->cts = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	spin_unlock_irqrestore(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) static void opticon_process_read_urb(struct urb *urb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	struct usb_serial_port *port = urb->context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	const unsigned char *hdr = urb->transfer_buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	const unsigned char *data = hdr + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	size_t data_len = urb->actual_length - 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	if (urb->actual_length <= 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		dev_dbg(&port->dev, "malformed packet received: %d bytes\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 							urb->actual_length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	 * Data from the device comes with a 2 byte header:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	 * <0x00><0x00>data...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	 *      This is real data to be sent to the tty layer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	 * <0x00><0x01>level
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	 *      This is a CTS level change, the third byte is the CTS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	 *      value (0 for low, 1 for high).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	if ((hdr[0] == 0x00) && (hdr[1] == 0x00)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		opticon_process_data_packet(port, data, data_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	} else if ((hdr[0] == 0x00) && (hdr[1] == 0x01)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		opticon_process_status_packet(port, data, data_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		dev_dbg(&port->dev, "unknown packet received: %02x %02x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 							hdr[0], hdr[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static int send_control_msg(struct usb_serial_port *port, u8 requesttype,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 				u8 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	struct usb_serial *serial = port->serial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	u8 *buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	buffer = kzalloc(1, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	if (!buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	buffer[0] = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	/* Send the message to the vendor control endpoint
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	 * of the connected device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 				requesttype,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 				USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 				0, 0, buffer, 1, USB_CTRL_SET_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	kfree(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (retval < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static int opticon_open(struct tty_struct *tty, struct usb_serial_port *port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	struct opticon_private *priv = usb_get_serial_port_data(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	spin_lock_irqsave(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	priv->rts = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	spin_unlock_irqrestore(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	/* Clear RTS line */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	send_control_msg(port, CONTROL_RTS, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	/* clear the halt status of the endpoint */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	usb_clear_halt(port->serial->dev, port->read_urb->pipe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	res = usb_serial_generic_open(tty, port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	if (res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	/* Request CTS line state, sometimes during opening the current
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	 * CTS state can be missed. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	send_control_msg(port, RESEND_CTS_STATE, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) static void opticon_close(struct usb_serial_port *port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	struct opticon_private *priv = usb_get_serial_port_data(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	usb_kill_anchored_urbs(&priv->anchor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	usb_serial_generic_close(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static void opticon_write_control_callback(struct urb *urb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	struct usb_serial_port *port = urb->context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	struct opticon_private *priv = usb_get_serial_port_data(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	int status = urb->status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	/* free up the transfer buffer, as usb_free_urb() does not do this */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	kfree(urb->transfer_buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	/* setup packet may be set if we're using it for writing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	kfree(urb->setup_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	if (status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		dev_dbg(&port->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 			"%s - non-zero urb status received: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			__func__, status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	spin_lock_irqsave(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	--priv->outstanding_urbs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	priv->outstanding_bytes -= urb->transfer_buffer_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	spin_unlock_irqrestore(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	usb_serial_port_softint(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 			 const unsigned char *buf, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	struct opticon_private *priv = usb_get_serial_port_data(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	struct usb_serial *serial = port->serial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	struct urb *urb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	unsigned char *buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	struct usb_ctrlrequest *dr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	int ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	spin_lock_irqsave(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	if (priv->outstanding_urbs > URB_UPPER_LIMIT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		spin_unlock_irqrestore(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	priv->outstanding_urbs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	priv->outstanding_bytes += count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	spin_unlock_irqrestore(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	buffer = kmalloc(count, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	if (!buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		goto error_no_buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	urb = usb_alloc_urb(0, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	if (!urb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		goto error_no_urb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	memcpy(buffer, buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	usb_serial_debug_data(&port->dev, __func__, count, buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	/* The connected devices do not have a bulk write endpoint,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	 * to transmit data to de barcode device the control endpoint is used */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	if (!dr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		goto error_no_dr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	dr->bRequestType = USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	dr->bRequest = 0x01;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	dr->wValue = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	dr->wIndex = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	dr->wLength = cpu_to_le16(count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	usb_fill_control_urb(urb, serial->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		usb_sndctrlpipe(serial->dev, 0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		(unsigned char *)dr, buffer, count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		opticon_write_control_callback, port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	usb_anchor_urb(urb, &priv->anchor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	/* send it down the pipe */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	ret = usb_submit_urb(urb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		dev_err(&port->dev, "failed to submit write urb: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		usb_unanchor_urb(urb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	/* we are done with this urb, so let the host driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	 * really free it when it is finished with it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	usb_free_urb(urb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	kfree(dr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) error_no_dr:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	usb_free_urb(urb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) error_no_urb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	kfree(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) error_no_buffer:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	spin_lock_irqsave(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	--priv->outstanding_urbs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	priv->outstanding_bytes -= count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	spin_unlock_irqrestore(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) static int opticon_write_room(struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	struct usb_serial_port *port = tty->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	struct opticon_private *priv = usb_get_serial_port_data(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	 * We really can take almost anything the user throws at us
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	 * but let's pick a nice big number to tell the tty
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	 * layer that we have lots of free space, unless we don't.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	spin_lock_irqsave(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	if (priv->outstanding_urbs > URB_UPPER_LIMIT * 2 / 3) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		spin_unlock_irqrestore(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	spin_unlock_irqrestore(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	return 2048;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) static int opticon_chars_in_buffer(struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	struct usb_serial_port *port = tty->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	struct opticon_private *priv = usb_get_serial_port_data(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	int count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	spin_lock_irqsave(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	count = priv->outstanding_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	spin_unlock_irqrestore(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) static int opticon_tiocmget(struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	struct usb_serial_port *port = tty->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	struct opticon_private *priv = usb_get_serial_port_data(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	int result = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	spin_lock_irqsave(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	if (priv->rts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		result |= TIOCM_RTS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	if (priv->cts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		result |= TIOCM_CTS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	spin_unlock_irqrestore(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	dev_dbg(&port->dev, "%s - %x\n", __func__, result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) static int opticon_tiocmset(struct tty_struct *tty,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 			   unsigned int set, unsigned int clear)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	struct usb_serial_port *port = tty->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	struct opticon_private *priv = usb_get_serial_port_data(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	bool rts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	bool changed = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	/* We only support RTS so we only handle that */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	spin_lock_irqsave(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	rts = priv->rts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	if (set & TIOCM_RTS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		priv->rts = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	if (clear & TIOCM_RTS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		priv->rts = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	changed = rts ^ priv->rts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	spin_unlock_irqrestore(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	if (!changed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	ret = send_control_msg(port, CONTROL_RTS, !rts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		return usb_translate_errors(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) static int get_serial_info(struct tty_struct *tty,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 			   struct serial_struct *ss)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	struct usb_serial_port *port = tty->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	/* fake emulate a 16550 uart to make userspace code happy */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	ss->type		= PORT_16550A;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	ss->line		= port->minor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	ss->port		= 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	ss->irq			= 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	ss->xmit_fifo_size	= 1024;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	ss->baud_base		= 9600;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	ss->close_delay		= 5*HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	ss->closing_wait	= 30*HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) static int opticon_port_probe(struct usb_serial_port *port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	struct opticon_private *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	if (!priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	spin_lock_init(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	init_usb_anchor(&priv->anchor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	usb_set_serial_port_data(port, priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) static int opticon_port_remove(struct usb_serial_port *port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	struct opticon_private *priv = usb_get_serial_port_data(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	kfree(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) static struct usb_serial_driver opticon_device = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 		.owner =	THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 		.name =		"opticon",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	.id_table =		id_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	.num_ports =		1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	.num_bulk_in =		1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	.bulk_in_size =		256,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	.port_probe =		opticon_port_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	.port_remove =		opticon_port_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 	.open =			opticon_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 	.close =		opticon_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	.write =		opticon_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	.write_room = 		opticon_write_room,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	.chars_in_buffer =	opticon_chars_in_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	.throttle =		usb_serial_generic_throttle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	.unthrottle =		usb_serial_generic_unthrottle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	.get_serial =		get_serial_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	.tiocmget =		opticon_tiocmget,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	.tiocmset =		opticon_tiocmset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	.process_read_urb =	opticon_process_read_urb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) static struct usb_serial_driver * const serial_drivers[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	&opticon_device, NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) module_usb_serial_driver(serial_drivers, id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) MODULE_DESCRIPTION(DRIVER_DESC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) MODULE_LICENSE("GPL v2");