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dell-laptop: Do not cache hwswitch state

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The hwswitch state can be changed at runtime, so make sure dell-laptop
always knows the current state. It can be modified by the userspace
utility smbios-wireless-ctl.

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
This commit is contained in:
Pali Rohár 2015-07-06 12:08:57 +02:00 committed by Darren Hart
parent 715d0cdd5a
commit 22565ba0bf
1 changed files with 61 additions and 24 deletions
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85
drivers/platform/x86/dell-laptop.c
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@ -309,8 +309,6 @@ static const struct dmi_system_id dell_quirks[] __initconst = {
static struct calling_interface_buffer *buffer;
static DEFINE_MUTEX(buffer_mutex);
static int hwswitch_state;
static void clear_buffer(void)
{
memset(buffer, 0, sizeof(struct calling_interface_buffer));
@ -553,20 +551,30 @@ static int dell_rfkill_set(void *data, bool blocked)
int disable = blocked ? 1 : 0;
unsigned long radio = (unsigned long)data;
int hwswitch_bit = (unsigned long)data - 1;
int hwswitch;
int status;
int ret;
get_buffer();
dell_send_request(buffer, 17, 11);
ret = buffer->output[0];
status = buffer->output[1];
if (ret != 0)
goto out;
clear_buffer();
buffer->input[0] = 0x2;
dell_send_request(buffer, 17, 11);
ret = buffer->output[0];
hwswitch = buffer->output[1];
/* If the hardware switch controls this radio, and the hardware
switch is disabled, always disable the radio */
if ((hwswitch_state & BIT(hwswitch_bit)) &&
!(buffer->output[1] & BIT(16)))
if (ret == 0 && (hwswitch & BIT(hwswitch_bit)) &&
(status & BIT(0)) && !(status & BIT(16)))
disable = 1;
clear_buffer();
@ -597,27 +605,43 @@ static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
}
static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
int status)
int status, int hwswitch)
{
if (hwswitch_state & (BIT(radio - 1)))
if (hwswitch & (BIT(radio - 1)))
rfkill_set_hw_state(rfkill, !(status & BIT(16)));
}
static void dell_rfkill_query(struct rfkill *rfkill, void *data)
{
int radio = ((unsigned long)data & 0xF);
int hwswitch;
int status;
int ret;
get_buffer();
dell_send_request(buffer, 17, 11);
ret = buffer->output[0];
status = buffer->output[1];
if (ret != 0 || !(status & BIT(0))) {
release_buffer();
return;
}
clear_buffer();
buffer->input[0] = 0x2;
dell_send_request(buffer, 17, 11);
ret = buffer->output[0];
hwswitch = buffer->output[1];
release_buffer();
if (ret != 0)
return;
dell_rfkill_update_hw_state(rfkill, (unsigned long)data, status);
dell_rfkill_update_hw_state(rfkill, radio, status, hwswitch);
}
static const struct rfkill_ops dell_rfkill_ops = {
@ -629,13 +653,24 @@ static struct dentry *dell_laptop_dir;
static int dell_debugfs_show(struct seq_file *s, void *data)
{
int hwswitch_state;
int hwswitch_ret;
int status;
int ret;
get_buffer();
dell_send_request(buffer, 17, 11);
ret = buffer->output[0];
status = buffer->output[1];
clear_buffer();
buffer->input[0] = 0x2;
dell_send_request(buffer, 17, 11);
hwswitch_ret = buffer->output[0];
hwswitch_state = buffer->output[1];
release_buffer();
seq_printf(s, "return:\t%d\n", ret);
@ -680,7 +715,8 @@ static int dell_debugfs_show(struct seq_file *s, void *data)
seq_printf(s, "Bit 21: WiGig is blocked: %lu\n",
(status & BIT(21)) >> 21);
seq_printf(s, "\nhwswitch_state:\t0x%X\n", hwswitch_state);
seq_printf(s, "\nhwswitch_return:\t%d\n", hwswitch_ret);
seq_printf(s, "hwswitch_state:\t0x%X\n", hwswitch_state);
seq_printf(s, "Bit 0 : Wifi controlled by switch: %lu\n",
hwswitch_state & BIT(0));
seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
@ -716,6 +752,7 @@ static const struct file_operations dell_debugfs_fops = {
static void dell_update_rfkill(struct work_struct *ignored)
{
int hwswitch = 0;
int status;
int ret;
@ -728,16 +765,26 @@ static void dell_update_rfkill(struct work_struct *ignored)
if (ret != 0)
goto out;
clear_buffer();
buffer->input[0] = 0x2;
dell_send_request(buffer, 17, 11);
ret = buffer->output[0];
if (ret == 0 && (status & BIT(0)))
hwswitch = buffer->output[1];
if (wifi_rfkill) {
dell_rfkill_update_hw_state(wifi_rfkill, 1, status);
dell_rfkill_update_hw_state(wifi_rfkill, 1, status, hwswitch);
dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
}
if (bluetooth_rfkill) {
dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status);
dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status,
hwswitch);
dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
}
if (wwan_rfkill) {
dell_rfkill_update_hw_state(wwan_rfkill, 3, status);
dell_rfkill_update_hw_state(wwan_rfkill, 3, status, hwswitch);
dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
}
@ -805,25 +852,15 @@ static int __init dell_setup_rfkill(void)
dell_send_request(buffer, 17, 11);
ret = buffer->output[0];
status = buffer->output[1];
clear_buffer();
buffer->input[0] = 0x2;
dell_send_request(buffer, 17, 11);
hwswitch_state = buffer->output[1];
release_buffer();
/* dell wireless info smbios call is not supported */
if (ret != 0)
return 0;
if (!(status & BIT(0))) {
if (force_rfkill) {
/* No hwsitch, clear all hw-controlled bits */
hwswitch_state &= ~7;
} else {
/* rfkill is only tested on laptops with a hwswitch */
return 0;
}
}
/* rfkill is only tested on laptops with a hwswitch */
if (!(status & BIT(0)) && !force_rfkill)
return 0;
if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,