summaryrefslogtreecommitdiffstats
path: root/Documentation/serial
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2018-10-29 10:42:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-10-29 10:42:20 -0700
commit5bd4af34a09a381a0f8b1552684650698937e6b0 (patch)
treef539764b25c09e6e1d181854e281c14c162fc30c /Documentation/serial
parent738b04fba18d35cd352b7b15afefb8a7b798648e (diff)
parent59eaeba63a171127a90bb76187536ba66076af40 (diff)
downloadblackbird-obmc-linux-5bd4af34a09a381a0f8b1552684650698937e6b0.tar.gz
blackbird-obmc-linux-5bd4af34a09a381a0f8b1552684650698937e6b0.zip
Merge tag 'tty-4.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty/serial updates from Greg KH: "Here is the big tty and serial pull request for 4.20-rc1 Lots of little things here, including a merge from the SPI tree in order to keep things simpler for everyone to sync around for one platform. Major stuff is: - tty buffer clearing after use - atmel_serial fixes and additions - xilinx uart driver updates and of course, lots of tiny fixes and additions to individual serial drivers. All of these have been in linux-next with no reported issues for a while" * tag 'tty-4.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (66 commits) of: base: Change logic in of_alias_get_alias_list() of: base: Fix english spelling in of_alias_get_alias_list() serial: sh-sci: do not warn if DMA transfers are not supported serial: uartps: Do not allow use aliases >= MAX_UART_INSTANCES tty: check name length in tty_find_polling_driver() serial: sh-sci: Add r8a77990 support tty: wipe buffer if not echoing data tty: wipe buffer. serial: fsl_lpuart: Remove the alias node dependence TTY: sn_console: Replace spin_is_locked() with spin_trylock() Revert "serial:serial_core: Allow use of CTS for PPS line discipline" serial: 8250_uniphier: add auto-flow-control support serial: 8250_uniphier: flatten probe function serial: 8250_uniphier: remove unused "fifo-size" property dt-bindings: serial: sh-sci: Document r8a7744 bindings serial: uartps: Fix missing unlock on error in cdns_get_id() tty/serial: atmel: add ISO7816 support tty/serial_core: add ISO7816 infrastructure serial:serial_core: Allow use of CTS for PPS line discipline serial: docs: Fix filename for serial reference implementation ...
Diffstat (limited to 'Documentation/serial')
-rw-r--r--Documentation/serial/driver2
-rw-r--r--Documentation/serial/serial-iso7816.txt83
2 files changed, 84 insertions, 1 deletions
diff --git a/Documentation/serial/driver b/Documentation/serial/driver
index da193e092fc3..86e47c19a924 100644
--- a/Documentation/serial/driver
+++ b/Documentation/serial/driver
@@ -7,7 +7,7 @@ This document is meant as a brief overview of some aspects of the new serial
driver. It is not complete, any questions you have should be directed to
<rmk@arm.linux.org.uk>
-The reference implementation is contained within amba_pl011.c.
+The reference implementation is contained within amba-pl011.c.
diff --git a/Documentation/serial/serial-iso7816.txt b/Documentation/serial/serial-iso7816.txt
new file mode 100644
index 000000000000..3193d24a2b0f
--- /dev/null
+++ b/Documentation/serial/serial-iso7816.txt
@@ -0,0 +1,83 @@
+ ISO7816 SERIAL COMMUNICATIONS
+
+1. INTRODUCTION
+
+ ISO/IEC7816 is a series of standards specifying integrated circuit cards (ICC)
+ also known as smart cards.
+
+2. HARDWARE-RELATED CONSIDERATIONS
+
+ Some CPUs/UARTs (e.g., Microchip AT91) contain a built-in mode capable of
+ handling communication with a smart card.
+
+ For these microcontrollers, the Linux driver should be made capable of
+ working in both modes, and proper ioctls (see later) should be made
+ available at user-level to allow switching from one mode to the other, and
+ vice versa.
+
+3. DATA STRUCTURES ALREADY AVAILABLE IN THE KERNEL
+
+ The Linux kernel provides the serial_iso7816 structure (see [1]) to handle
+ ISO7816 communications. This data structure is used to set and configure
+ ISO7816 parameters in ioctls.
+
+ Any driver for devices capable of working both as RS232 and ISO7816 should
+ implement the iso7816_config callback in the uart_port structure. The
+ serial_core calls iso7816_config to do the device specific part in response
+ to TIOCGISO7816 and TIOCSISO7816 ioctls (see below). The iso7816_config
+ callback receives a pointer to struct serial_iso7816.
+
+4. USAGE FROM USER-LEVEL
+
+ From user-level, ISO7816 configuration can be get/set using the previous
+ ioctls. For instance, to set ISO7816 you can use the following code:
+
+ #include <linux/serial.h>
+
+ /* Include definition for ISO7816 ioctls: TIOCSISO7816 and TIOCGISO7816 */
+ #include <sys/ioctl.h>
+
+ /* Open your specific device (e.g., /dev/mydevice): */
+ int fd = open ("/dev/mydevice", O_RDWR);
+ if (fd < 0) {
+ /* Error handling. See errno. */
+ }
+
+ struct serial_iso7816 iso7816conf;
+
+ /* Reserved fields as to be zeroed */
+ memset(&iso7816conf, 0, sizeof(iso7816conf));
+
+ /* Enable ISO7816 mode: */
+ iso7816conf.flags |= SER_ISO7816_ENABLED;
+
+ /* Select the protocol: */
+ /* T=0 */
+ iso7816conf.flags |= SER_ISO7816_T(0);
+ /* or T=1 */
+ iso7816conf.flags |= SER_ISO7816_T(1);
+
+ /* Set the guard time: */
+ iso7816conf.tg = 2;
+
+ /* Set the clock frequency*/
+ iso7816conf.clk = 3571200;
+
+ /* Set transmission factors: */
+ iso7816conf.sc_fi = 372;
+ iso7816conf.sc_di = 1;
+
+ if (ioctl(fd_usart, TIOCSISO7816, &iso7816conf) < 0) {
+ /* Error handling. See errno. */
+ }
+
+ /* Use read() and write() syscalls here... */
+
+ /* Close the device when finished: */
+ if (close (fd) < 0) {
+ /* Error handling. See errno. */
+ }
+
+5. REFERENCES
+
+ [1] include/uapi/linux/serial.h
OpenPOWER on IntegriCloud