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comparison linux-patch/ftdi_sio.c.patch @ 73:749e1a14aa24

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linux-patch: publishing currently used ftdi_sio driver patch
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 30 Jul 2020 05:12:44 +0000
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72:5197272cd624 73:749e1a14aa24
1 --- ftdi_sio.c.orig 2016-06-24 09:18:38.000000000 -0800
2 +++ ftdi_sio.c 2020-07-28 15:33:04.022945400 -0800
3 @@ -73,6 +73,8 @@
4 this value */
5 int force_rtscts; /* if non-zero, force RTS-CTS to always
6 be enabled */
7 + int no_auto_dtr_rts; /* if non-zero, suppress automatic assertion
8 + of DTR & RTS on device open */
9
10 unsigned int latency; /* latency setting in use */
11 unsigned short max_packet_size;
12 @@ -83,15 +85,19 @@
13 struct ftdi_sio_quirk {
14 int (*probe)(struct usb_serial *);
15 /* Special settings for probed ports. */
16 - void (*port_probe)(struct ftdi_private *);
17 + void (*port_probe)(struct usb_serial_port *, struct ftdi_private *);
18 };
19
20 static int ftdi_jtag_probe(struct usb_serial *serial);
21 static int ftdi_NDI_device_setup(struct usb_serial *serial);
22 static int ftdi_stmclite_probe(struct usb_serial *serial);
23 static int ftdi_8u2232c_probe(struct usb_serial *serial);
24 -static void ftdi_USB_UIRT_setup(struct ftdi_private *priv);
25 -static void ftdi_HE_TIRA1_setup(struct ftdi_private *priv);
26 +static void ftdi_USB_UIRT_setup(struct usb_serial_port *port,
27 + struct ftdi_private *priv);
28 +static void ftdi_HE_TIRA1_setup(struct usb_serial_port *port,
29 + struct ftdi_private *priv);
30 +static void ftdi_duart28c_setup(struct usb_serial_port *port,
31 + struct ftdi_private *priv);
32
33 static struct ftdi_sio_quirk ftdi_jtag_quirk = {
34 .probe = ftdi_jtag_probe,
35 @@ -117,6 +123,10 @@
36 .probe = ftdi_8u2232c_probe,
37 };
38
39 +static struct ftdi_sio_quirk ftdi_duart28c_quirk = {
40 + .port_probe = ftdi_duart28c_setup,
41 +};
42 +
43 /*
44 * The 8U232AM has the same API as the sio except for:
45 * - it can support MUCH higher baudrates; up to:
46 @@ -1008,6 +1018,13 @@
47 { USB_DEVICE(ICPDAS_VID, ICPDAS_I7560U_PID) },
48 { USB_DEVICE(ICPDAS_VID, ICPDAS_I7561U_PID) },
49 { USB_DEVICE(ICPDAS_VID, ICPDAS_I7563U_PID) },
50 + /* FreeCalypso USB adapters */
51 + { USB_DEVICE(FTDI_VID, FTDI_FALCONIA_JTAG_BUF_PID),
52 + .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
53 + { USB_DEVICE(FTDI_VID, FTDI_FALCONIA_JTAG_UNBUF_PID),
54 + .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
55 + { USB_DEVICE(FTDI_VID, FTDI_FALCONIA_DUART28C_PID),
56 + .driver_info = (kernel_ulong_t)&ftdi_duart28c_quirk },
57 { } /* Terminating entry */
58 };
59
60 @@ -1804,7 +1821,7 @@
61 priv->flags = ASYNC_LOW_LATENCY;
62
63 if (quirk && quirk->port_probe)
64 - quirk->port_probe(priv);
65 + quirk->port_probe(port, priv);
66
67 usb_set_serial_port_data(port, priv);
68
69 @@ -1820,7 +1837,8 @@
70 /* Setup for the USB-UIRT device, which requires hardwired
71 * baudrate (38400 gets mapped to 312500) */
72 /* Called from usbserial:serial_probe */
73 -static void ftdi_USB_UIRT_setup(struct ftdi_private *priv)
74 +static void ftdi_USB_UIRT_setup(struct usb_serial_port *port,
75 + struct ftdi_private *priv)
76 {
77 priv->flags |= ASYNC_SPD_CUST;
78 priv->custom_divisor = 77;
79 @@ -1830,7 +1848,8 @@
80 /* Setup for the HE-TIRA1 device, which requires hardwired
81 * baudrate (38400 gets mapped to 100000) and RTS-CTS enabled. */
82
83 -static void ftdi_HE_TIRA1_setup(struct ftdi_private *priv)
84 +static void ftdi_HE_TIRA1_setup(struct usb_serial_port *port,
85 + struct ftdi_private *priv)
86 {
87 priv->flags |= ASYNC_SPD_CUST;
88 priv->custom_divisor = 240;
89 @@ -1926,6 +1945,37 @@
90 return 0;
91 }
92
93 +/*
94 + * FreeCalypso DUART28C is an FT2232D-based USB to dual UART adapter
95 + * with a special quirk: Channel B RTS and DTR outputs (BDBUS2 and BDBUS4
96 + * on the chip) have been repurposed to drive power and reset controls
97 + * on Calypso targets. The circuit is wired such that BDBUS[24] high
98 + * (RTS/DTR inactive) is the normal state with power/reset control
99 + * NOT activated, whereas BDBUS[24] low (RTS or DTR active) turn ON
100 + * the corresponding power/reset control drivers.
101 + *
102 + * A special ftdi_sio driver quirk is needed in order to suppress
103 + * automatic assertion of DTR & RTS on device open: this device's
104 + * special power and reset control drivers MUST NOT be activated
105 + * when the port is ordinarily opened for plain serial communication,
106 + * instead they must only be activated when a special userspace
107 + * application explicitly requests such activation with a TIOCMBIS ioctl.
108 + *
109 + * The special quirk must be applied only to FT2232D Channel B:
110 + * Channel A is wired normally, with the chip's ADBUS2 and ADBUS4 outputs
111 + * actually being RTS and DTR rather than something else.
112 + */
113 +static void ftdi_duart28c_setup(struct usb_serial_port *port,
114 + struct ftdi_private *priv)
115 +{
116 + struct usb_serial *serial = port->serial;
117 + struct usb_device *udev = serial->dev;
118 + struct usb_interface *interface = serial->interface;
119 +
120 + if (interface == udev->actconfig->interface[1])
121 + priv->no_auto_dtr_rts = 1;
122 +}
123 +
124 static int ftdi_sio_port_remove(struct usb_serial_port *port)
125 {
126 struct ftdi_private *priv = usb_get_serial_port_data(port);
127 @@ -1976,9 +2026,10 @@
128 }
129 }
130 /* drop RTS and DTR */
131 - if (on)
132 - set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
133 - else
134 + if (on) {
135 + if (!priv->no_auto_dtr_rts)
136 + set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
137 + } else
138 clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
139 }
140
141 @@ -2316,7 +2367,8 @@
142 dev_err(ddev, "%s urb failed to set baudrate\n", __func__);
143 mutex_unlock(&priv->cfg_lock);
144 /* Ensure RTS and DTR are raised when baudrate changed from 0 */
145 - if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
146 + if (old_termios && (old_termios->c_cflag & CBAUD) == B0
147 + && !priv->no_auto_dtr_rts)
148 set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
149 }
150