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msm_serial_hs_lite: Changes for enable/disable console

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usage:
To disable console:
echo 0 > /sys/devices/platform/msm_serial_hsl.0/console

To enable console:
echo 1 > /sys/devices/platform/msm_serial_hsl.0/console

To see the status of console:
cat /sys/devices/platform/msm_serial_hsl.0/console

Change-Id: I3fe188cd18429641de8e48075f37a1729a36d80b
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
This commit is contained in:
Mayank Rana
2011-09-05 18:22:02 +05:30
parent a699bce127
commit 930c99cb4a
1 changed files with 95 additions and 1 deletions
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96
drivers/tty/serial/msm_serial_hs_lite.c
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@@ -1138,7 +1138,7 @@ static void msm_hsl_console_write(struct console *co, const char *s,
spin_unlock(&port->lock);
}
static int __init msm_hsl_console_setup(struct console *co, char *options)
static int msm_hsl_console_setup(struct console *co, char *options)
{
struct uart_port *port;
unsigned int vid;
@@ -1201,7 +1201,93 @@ static struct console msm_hsl_console = {
};
#define MSM_HSL_CONSOLE (&msm_hsl_console)
/*
* get_console_state - check the per-port serial console state.
* @port: uart_port structure describing the port
*
* Return the state of serial console availability on port.
* return 1: If serial console is enabled on particular UART port.
* return 0: If serial console is disabled on particular UART port.
*/
static int get_console_state(struct uart_port *port)
{
if (is_console(port) && (port->cons->flags & CON_ENABLED))
return 1;
else
return 0;
}
/* show_msm_console - provide per-port serial console state. */
static ssize_t show_msm_console(struct device *dev,
struct device_attribute *attr, char *buf)
{
int enable;
struct uart_port *port;
struct platform_device *pdev = to_platform_device(dev);
port = get_port_from_line(pdev->id);
enable = get_console_state(port);
return snprintf(buf, sizeof(enable), "%d\n", enable);
}
/*
* set_msm_console - allow to enable/disable serial console on port.
*
* writing 1 enables serial console on UART port.
* writing 0 disables serial console on UART port.
*/
static ssize_t set_msm_console(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int enable, cur_state;
struct uart_port *port;
struct platform_device *pdev = to_platform_device(dev);
port = get_port_from_line(pdev->id);
cur_state = get_console_state(port);
enable = buf[0] - '0';
if (enable == cur_state)
return count;
switch (enable) {
case 0:
pr_debug("%s(): Calling stop_console\n", __func__);
console_stop(port->cons);
pr_debug("%s(): Calling unregister_console\n", __func__);
unregister_console(port->cons);
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
/*
* Disable UART Core clk
* 3 - to disable the UART clock
* Thid parameter is not used here, but used in serial core.
*/
msm_hsl_power(port, 3, 1);
break;
case 1:
pr_debug("%s(): Calling register_console\n", __func__);
/*
* Disable UART Core clk
* 0 - to enable the UART clock
* Thid parameter is not used here, but used in serial core.
*/
msm_hsl_power(port, 0, 1);
pm_runtime_enable(&pdev->dev);
register_console(port->cons);
break;
default:
return -EINVAL;
}
return count;
}
static DEVICE_ATTR(console, S_IWUSR | S_IRUGO, show_msm_console,
set_msm_console);
#else
#define MSM_HSL_CONSOLE NULL
#endif
@@ -1286,6 +1372,11 @@ static int __devinit msm_serial_hsl_probe(struct platform_device *pdev)
device_set_wakeup_capable(&pdev->dev, 1);
platform_set_drvdata(pdev, port);
pm_runtime_enable(port->dev);
#ifdef CONFIG_SERIAL_MSM_HSL_CONSOLE
ret = device_create_file(&pdev->dev, &dev_attr_console);
if (unlikely(ret))
pr_err("%s():Can't create console attribute\n", __func__);
#endif
msm_hsl_debugfs_init(msm_hsl_port, pdev->id);
/* Temporarily increase the refcount on the GSBI clock to avoid a race
@@ -1305,6 +1396,9 @@ static int __devexit msm_serial_hsl_remove(struct platform_device *pdev)
struct uart_port *port;
port = get_port_from_line(pdev->id);
#ifdef CONFIG_SERIAL_MSM_HSL_CONSOLE
device_remove_file(&pdev->dev, &dev_attr_console);
#endif
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);