This patch adds functionality to validate and convert either a device
name or 'ser' member of synth into dev_t. Subsequent patch in this set
will call it to convert user-specified device into device number. For
device name, this patch does some basic sanity checks on the string
passed in. It currently supports ttyS*, ttyUSB* and, for selected
synths, lp*.
The patch also introduces a string member variable named 'dev_name' to
struct spk_synth. 'dev_name' represents the device name - ttyUSB0 etc -
which needs conversion to dev_t.
Signed-off-by: Okash Khawaja <okash.khawaja@xxxxxxxxx>
---
drivers/staging/speakup/spk_priv.h | 2 +
drivers/staging/speakup/spk_ttyio.c | 46 ++++++++++++++++++++++++++++++++++++
drivers/staging/speakup/spk_types.h | 1
3 files changed, 49 insertions(+)
--- a/drivers/staging/speakup/spk_priv.h
+++ b/drivers/staging/speakup/spk_priv.h
@@ -40,6 +40,8 @@
#define KT_SPKUP 15
#define SPK_SYNTH_TIMEOUT 100000 /* in micro-seconds */
+#define SYNTH_DEFAULT_DEV "ttyS0"
+#define SYNTH_DEFAULT_SER 0
const struct old_serial_port *spk_serial_init(int index);
void spk_stop_serial_interrupt(void);
--- a/drivers/staging/speakup/spk_ttyio.c
+++ b/drivers/staging/speakup/spk_ttyio.c
@@ -7,6 +7,10 @@
#include "spk_types.h"
#include "spk_priv.h"
+#define DEV_PREFIX_LP "lp"
+
+const char *lp_supported[] = { "acntsa", "bns", "dummy", "txprt" };
+
struct spk_ldisc_data {
char buf;
struct semaphore sem;
@@ -16,6 +20,48 @@ struct spk_ldisc_data {
static struct spk_synth *spk_ttyio_synth;
static struct tty_struct *speakup_tty;
+int ser_to_dev(int ser, dev_t *dev_no)
+{
+ if (ser < 0 || ser > (255 - 64)) {
+ pr_err("speakup: Invalid ser param. \
+ Must be between 0 and 191 inclusive.\n");
+
+ return -EINVAL;
+ }
+
+ *dev_no = MKDEV(4, (64 + ser));
+ return 0;
+}
+
+static int get_dev_to_use(struct spk_synth *synth, dev_t *dev_no)
+{
+ /* use ser only when dev is not specified */
+ if (strcmp(synth->dev_name, SYNTH_DEFAULT_DEV) || synth->ser == SYNTH_DEFAULT_SER) {
+ /* for /dev/lp* check if synth is supported */
+ if (strncmp(synth->dev_name, DEV_PREFIX_LP, strlen(DEV_PREFIX_LP)) == 0) {
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(lp_supported); i++) {
+ if (strcmp(synth->name, lp_supported[i]) == 0)
+ break;
+ }
+
+ if (i >= ARRAY_SIZE(lp_supported)) {
+ pr_err("speakup: lp* is only supported on:");
+ for (i = 0; i < ARRAY_SIZE(lp_supported); i++)
+ pr_cont(" %s", lp_supported[i]);
+ pr_cont("\n");
+
+ return -ENOTSUPP;
+ }
+ }
+
+ return tty_dev_name_to_number(synth->dev_name, dev_no);
+ }
+
+ return ser_to_dev(synth->ser, dev_no);
+}
+
static int spk_ttyio_ldisc_open(struct tty_struct *tty)
{
struct spk_ldisc_data *ldisc_data;
--- a/drivers/staging/speakup/spk_types.h
+++ b/drivers/staging/speakup/spk_types.h
@@ -169,6 +169,7 @@ struct spk_synth {
int jiffies;
int full;
int ser;
+ char *dev_name;
short flags;
short startup;
const int checkval; /* for validating a proper synth module */
_______________________________________________
devel mailing list
devel@xxxxxxxxxxxxxxxxxxxxxx
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
