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annotate linux-patch/orig-202007/ftdi_sio.c.patch @ 176:fb2f6497ba53 default tip

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doc/Linux-DTR-RTS-flaw: point to new location of this article
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 11 Dec 2023 19:37:20 +0000
parents e2161ac7d641
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
73
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1 --- ftdi_sio.c.orig 2016-06-24 09:18:38.000000000 -0800
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2 +++ ftdi_sio.c 2020-07-28 15:33:04.022945400 -0800
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3 @@ -73,6 +73,8 @@
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4 this value */
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5 int force_rtscts; /* if non-zero, force RTS-CTS to always
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6 be enabled */
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7 + int no_auto_dtr_rts; /* if non-zero, suppress automatic assertion
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8 + of DTR & RTS on device open */
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9
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10 unsigned int latency; /* latency setting in use */
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11 unsigned short max_packet_size;
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12 @@ -83,15 +85,19 @@
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13 struct ftdi_sio_quirk {
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14 int (*probe)(struct usb_serial *);
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15 /* Special settings for probed ports. */
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16 - void (*port_probe)(struct ftdi_private *);
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17 + void (*port_probe)(struct usb_serial_port *, struct ftdi_private *);
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18 };
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19
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20 static int ftdi_jtag_probe(struct usb_serial *serial);
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21 static int ftdi_NDI_device_setup(struct usb_serial *serial);
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22 static int ftdi_stmclite_probe(struct usb_serial *serial);
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23 static int ftdi_8u2232c_probe(struct usb_serial *serial);
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24 -static void ftdi_USB_UIRT_setup(struct ftdi_private *priv);
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25 -static void ftdi_HE_TIRA1_setup(struct ftdi_private *priv);
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26 +static void ftdi_USB_UIRT_setup(struct usb_serial_port *port,
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27 + struct ftdi_private *priv);
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28 +static void ftdi_HE_TIRA1_setup(struct usb_serial_port *port,
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29 + struct ftdi_private *priv);
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30 +static void ftdi_duart28c_setup(struct usb_serial_port *port,
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31 + struct ftdi_private *priv);
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32
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33 static struct ftdi_sio_quirk ftdi_jtag_quirk = {
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34 .probe = ftdi_jtag_probe,
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35 @@ -117,6 +123,10 @@
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36 .probe = ftdi_8u2232c_probe,
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37 };
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38
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39 +static struct ftdi_sio_quirk ftdi_duart28c_quirk = {
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40 + .port_probe = ftdi_duart28c_setup,
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41 +};
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42 +
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43 /*
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44 * The 8U232AM has the same API as the sio except for:
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45 * - it can support MUCH higher baudrates; up to:
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46 @@ -1008,6 +1018,13 @@
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47 { USB_DEVICE(ICPDAS_VID, ICPDAS_I7560U_PID) },
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48 { USB_DEVICE(ICPDAS_VID, ICPDAS_I7561U_PID) },
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49 { USB_DEVICE(ICPDAS_VID, ICPDAS_I7563U_PID) },
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50 + /* FreeCalypso USB adapters */
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51 + { USB_DEVICE(FTDI_VID, FTDI_FALCONIA_JTAG_BUF_PID),
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52 + .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
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53 + { USB_DEVICE(FTDI_VID, FTDI_FALCONIA_JTAG_UNBUF_PID),
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54 + .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
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55 + { USB_DEVICE(FTDI_VID, FTDI_FALCONIA_DUART28C_PID),
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56 + .driver_info = (kernel_ulong_t)&ftdi_duart28c_quirk },
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57 { } /* Terminating entry */
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58 };
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59
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60 @@ -1804,7 +1821,7 @@
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61 priv->flags = ASYNC_LOW_LATENCY;
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62
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63 if (quirk && quirk->port_probe)
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64 - quirk->port_probe(priv);
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65 + quirk->port_probe(port, priv);
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66
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67 usb_set_serial_port_data(port, priv);
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68
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69 @@ -1820,7 +1837,8 @@
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70 /* Setup for the USB-UIRT device, which requires hardwired
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71 * baudrate (38400 gets mapped to 312500) */
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72 /* Called from usbserial:serial_probe */
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73 -static void ftdi_USB_UIRT_setup(struct ftdi_private *priv)
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74 +static void ftdi_USB_UIRT_setup(struct usb_serial_port *port,
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75 + struct ftdi_private *priv)
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76 {
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77 priv->flags |= ASYNC_SPD_CUST;
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78 priv->custom_divisor = 77;
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79 @@ -1830,7 +1848,8 @@
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80 /* Setup for the HE-TIRA1 device, which requires hardwired
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81 * baudrate (38400 gets mapped to 100000) and RTS-CTS enabled. */
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82
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83 -static void ftdi_HE_TIRA1_setup(struct ftdi_private *priv)
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84 +static void ftdi_HE_TIRA1_setup(struct usb_serial_port *port,
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85 + struct ftdi_private *priv)
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86 {
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87 priv->flags |= ASYNC_SPD_CUST;
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88 priv->custom_divisor = 240;
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89 @@ -1926,6 +1945,37 @@
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90 return 0;
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91 }
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92
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93 +/*
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94 + * FreeCalypso DUART28C is an FT2232D-based USB to dual UART adapter
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95 + * with a special quirk: Channel B RTS and DTR outputs (BDBUS2 and BDBUS4
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96 + * on the chip) have been repurposed to drive power and reset controls
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97 + * on Calypso targets. The circuit is wired such that BDBUS[24] high
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98 + * (RTS/DTR inactive) is the normal state with power/reset control
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99 + * NOT activated, whereas BDBUS[24] low (RTS or DTR active) turn ON
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100 + * the corresponding power/reset control drivers.
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101 + *
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102 + * A special ftdi_sio driver quirk is needed in order to suppress
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103 + * automatic assertion of DTR & RTS on device open: this device's
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104 + * special power and reset control drivers MUST NOT be activated
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105 + * when the port is ordinarily opened for plain serial communication,
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106 + * instead they must only be activated when a special userspace
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107 + * application explicitly requests such activation with a TIOCMBIS ioctl.
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108 + *
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109 + * The special quirk must be applied only to FT2232D Channel B:
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110 + * Channel A is wired normally, with the chip's ADBUS2 and ADBUS4 outputs
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111 + * actually being RTS and DTR rather than something else.
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112 + */
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113 +static void ftdi_duart28c_setup(struct usb_serial_port *port,
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114 + struct ftdi_private *priv)
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115 +{
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116 + struct usb_serial *serial = port->serial;
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117 + struct usb_device *udev = serial->dev;
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118 + struct usb_interface *interface = serial->interface;
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119 +
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120 + if (interface == udev->actconfig->interface[1])
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121 + priv->no_auto_dtr_rts = 1;
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122 +}
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123 +
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124 static int ftdi_sio_port_remove(struct usb_serial_port *port)
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125 {
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126 struct ftdi_private *priv = usb_get_serial_port_data(port);
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127 @@ -1976,9 +2026,10 @@
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128 }
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129 }
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130 /* drop RTS and DTR */
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131 - if (on)
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132 - set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
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133 - else
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134 + if (on) {
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135 + if (!priv->no_auto_dtr_rts)
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136 + set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
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137 + } else
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138 clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
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139 }
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140
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141 @@ -2316,7 +2367,8 @@
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142 dev_err(ddev, "%s urb failed to set baudrate\n", __func__);
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143 mutex_unlock(&priv->cfg_lock);
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144 /* Ensure RTS and DTR are raised when baudrate changed from 0 */
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145 - if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
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146 + if (old_termios && (old_termios->c_cflag & CBAUD) == B0
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147 + && !priv->no_auto_dtr_rts)
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148 set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
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149 }
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150