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[ARM] S3C2410: Add sysfs attribute for serial driver clock source

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Add attribute to show the current clock source for the serial
driver and remove old and annoying debug output.

Note, this only currently shows the current source with a
"* " prefix to indicate that it is the current source. Future
code will list all the clock sources, with the non-selected
one with "  " prefix.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
PATCH FOLLOWS
KernelVersion: 2.6.26-rc3
This commit is contained in:
Ben Dooks 2008-07-03 11:24:23 +01:00
parent 9cf345e399
commit ea304e394f
1 changed files with 20 additions and 11 deletions
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31
drivers/serial/s3c2410.c
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@ -685,11 +685,6 @@ static unsigned int s3c24xx_serial_getclk(struct uart_port *port,
int calc_deviation;
for (sptr = res; sptr < resptr; sptr++) {
printk(KERN_DEBUG
"found clk %p (%s) quot %d, calc %d\n",
sptr->clksrc, sptr->clksrc->name,
sptr->quot, sptr->calc);
calc_deviation = baud - sptr->calc;
if (calc_deviation < 0)
calc_deviation = -calc_deviation;
@ -699,13 +694,8 @@ static unsigned int s3c24xx_serial_getclk(struct uart_port *port,
deviation = calc_deviation;
}
}
printk(KERN_DEBUG "best %p (deviation %d)\n", best, deviation);
}
printk(KERN_DEBUG "selected clock %p (%s) quot %d, calc %d\n",
best->clksrc, best->clksrc->name, best->quot, best->calc);
/* store results to pass back */
*clksrc = best->clksrc;
@ -1058,6 +1048,18 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
return 0;
}
static ssize_t s3c24xx_serial_show_clksrc(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct uart_port *port = s3c24xx_dev_to_port(dev);
struct s3c24xx_uart_port *ourport = to_ourport(port);
return snprintf(buf, PAGE_SIZE, "* %s\n", ourport->clksrc->name);
}
static DEVICE_ATTR(clock_source, S_IRUGO, s3c24xx_serial_show_clksrc, NULL);
/* Device driver serial port probe */
static int probe_index = 0;
@ -1083,6 +1085,11 @@ static int s3c24xx_serial_probe(struct platform_device *dev,
uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
platform_set_drvdata(dev, &ourport->port);
ret = device_create_file(&dev->dev, &dev_attr_clock_source);
if (ret < 0) {
printk(KERN_ERR "%s: failed to add clksrc attr.\n", __func__);
}
return 0;
probe_err:
@ -1093,8 +1100,10 @@ static int s3c24xx_serial_remove(struct platform_device *dev)
{
struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
if (port)
if (port) {
device_remove_file(&dev->dev, &dev_attr_clock_source);
uart_remove_one_port(&s3c24xx_uart_drv, port);
}
return 0;
}