tty: n_gsm: add ioctl to map serial device to mux'ed tty
Guessing the first tty for a gsm0710 multiplexed serial device is not currently possible, which makes it racy to use with multiple modems. Add a way to map the physical serial tty to its related mux devices using an ioctl. Signed-off-by: Martin Hundebøll <martin@geanix.com> Link: https://lore.kernel.org/r/20190812211243.98686-1-martin@geanix.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>alistair/sunxi64-5.4-dsi
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d193db7fb1
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a7b121b4b8
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@ -18,10 +18,13 @@ How to use it
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2. switch the serial line to using the n_gsm line discipline by using
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2. switch the serial line to using the n_gsm line discipline by using
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TIOCSETD ioctl,
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TIOCSETD ioctl,
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3. configure the mux using GSMIOC_GETCONF / GSMIOC_SETCONF ioctl,
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3. configure the mux using GSMIOC_GETCONF / GSMIOC_SETCONF ioctl,
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4. obtain base gsmtty number for the used serial port,
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Major parts of the initialization program :
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Major parts of the initialization program :
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(a good starting point is util-linux-ng/sys-utils/ldattach.c)::
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(a good starting point is util-linux-ng/sys-utils/ldattach.c)::
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#include <stdio.h>
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#include <stdint.h>
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#include <linux/gsmmux.h>
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#include <linux/gsmmux.h>
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#include <linux/tty.h>
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#include <linux/tty.h>
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#define DEFAULT_SPEED B115200
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#define DEFAULT_SPEED B115200
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@ -30,6 +33,7 @@ Major parts of the initialization program :
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int ldisc = N_GSM0710;
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int ldisc = N_GSM0710;
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struct gsm_config c;
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struct gsm_config c;
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struct termios configuration;
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struct termios configuration;
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uint32_t first;
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/* open the serial port connected to the modem */
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/* open the serial port connected to the modem */
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fd = open(SERIAL_PORT, O_RDWR | O_NOCTTY | O_NDELAY);
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fd = open(SERIAL_PORT, O_RDWR | O_NOCTTY | O_NDELAY);
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@ -58,19 +62,22 @@ Major parts of the initialization program :
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c.mtu = 127;
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c.mtu = 127;
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/* set the new configuration */
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/* set the new configuration */
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ioctl(fd, GSMIOC_SETCONF, &c);
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ioctl(fd, GSMIOC_SETCONF, &c);
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/* get first gsmtty device node */
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ioctl(fd, GSMIOC_GETFIRST, &first);
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printf("first muxed line: /dev/gsmtty%i\n", first);
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/* and wait for ever to keep the line discipline enabled */
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/* and wait for ever to keep the line discipline enabled */
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daemon(0,0);
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daemon(0,0);
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pause();
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pause();
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4. use these devices as plain serial ports.
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5. use these devices as plain serial ports.
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for example, it's possible:
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for example, it's possible:
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- and to use gnokii to send / receive SMS on ttygsm1
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- and to use gnokii to send / receive SMS on ttygsm1
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- to use ppp to establish a datalink on ttygsm2
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- to use ppp to establish a datalink on ttygsm2
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5. first close all virtual ports before closing the physical port.
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6. first close all virtual ports before closing the physical port.
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Note that after closing the physical port the modem is still in multiplexing
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Note that after closing the physical port the modem is still in multiplexing
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mode. This may prevent a successful re-opening of the port later. To avoid
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mode. This may prevent a successful re-opening of the port later. To avoid
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@ -2613,6 +2613,7 @@ static int gsmld_ioctl(struct tty_struct *tty, struct file *file,
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{
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{
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struct gsm_config c;
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struct gsm_config c;
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struct gsm_mux *gsm = tty->disc_data;
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struct gsm_mux *gsm = tty->disc_data;
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unsigned int base;
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switch (cmd) {
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switch (cmd) {
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case GSMIOC_GETCONF:
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case GSMIOC_GETCONF:
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@ -2624,6 +2625,9 @@ static int gsmld_ioctl(struct tty_struct *tty, struct file *file,
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if (copy_from_user(&c, (void *)arg, sizeof(c)))
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if (copy_from_user(&c, (void *)arg, sizeof(c)))
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return -EFAULT;
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return -EFAULT;
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return gsm_config(gsm, &c);
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return gsm_config(gsm, &c);
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case GSMIOC_GETFIRST:
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base = mux_num_to_base(gsm);
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return put_user(base + 1, (__u32 __user *)arg);
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default:
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default:
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return n_tty_ioctl_helper(tty, file, cmd, arg);
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return n_tty_ioctl_helper(tty, file, cmd, arg);
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}
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}
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@ -37,5 +37,7 @@ struct gsm_netconfig {
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#define GSMIOC_ENABLE_NET _IOW('G', 2, struct gsm_netconfig)
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#define GSMIOC_ENABLE_NET _IOW('G', 2, struct gsm_netconfig)
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#define GSMIOC_DISABLE_NET _IO('G', 3)
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#define GSMIOC_DISABLE_NET _IO('G', 3)
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/* get the base tty number for a configured gsmmux tty */
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#define GSMIOC_GETFIRST _IOR('G', 4, __u32)
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#endif
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#endif
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