dell-laptop: Pay attention to which devices the hardware switch controls
Right now, we assume that the hardware rfkill switch on Dells toggles all radio devices. In fact, this can be configured in the BIOS and so right now we may mark a device as hardware killed even when it isn't. Add code to query the devices controlled by the switch, and use this when determining the hardware kill state of a radio. Signed-off-by: Matthew Garrett <mjg@redhat.com>
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parent
116ee77b28
commit
c6760ac426
1 changed files with 29 additions and 2 deletions
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@ -128,6 +128,8 @@ static struct calling_interface_buffer *buffer;
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struct page *bufferpage;
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DEFINE_MUTEX(buffer_mutex);
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static int hwswitch_state;
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static void get_buffer(void)
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{
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mutex_lock(&buffer_mutex);
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@ -217,6 +219,8 @@ dell_send_request(struct calling_interface_buffer *buffer, int class,
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/* Derived from information in DellWirelessCtl.cpp:
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Class 17, select 11 is radio control. It returns an array of 32-bit values.
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Input byte 0 = 0: Wireless information
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result[0]: return code
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result[1]:
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Bit 0: Hardware switch supported
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@ -237,18 +241,35 @@ dell_send_request(struct calling_interface_buffer *buffer, int class,
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Bits 20-31: Reserved
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result[2]: NVRAM size in bytes
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result[3]: NVRAM format version number
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Input byte 0 = 2: Wireless switch configuration
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result[0]: return code
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result[1]:
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Bit 0: Wifi controlled by switch
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Bit 1: Bluetooth controlled by switch
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Bit 2: WWAN controlled by switch
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Bits 3-6: Reserved
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Bit 7: Wireless switch config locked
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Bit 8: Wifi locator enabled
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Bits 9-14: Reserved
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Bit 15: Wifi locator setting locked
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Bits 16-31: Reserved
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*/
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static int dell_rfkill_set(void *data, bool blocked)
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{
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int disable = blocked ? 1 : 0;
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unsigned long radio = (unsigned long)data;
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int hwswitch_bit = (unsigned long)data - 1;
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int ret = 0;
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get_buffer();
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dell_send_request(buffer, 17, 11);
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if (!(buffer->output[1] & BIT(16))) {
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/* If the hardware switch controls this radio, and the hardware
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switch is disabled, don't allow changing the software state */
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if ((hwswitch_state & BIT(hwswitch_bit)) &&
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!(buffer->output[1] & BIT(16))) {
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ret = -EINVAL;
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goto out;
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}
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@ -265,6 +286,7 @@ static void dell_rfkill_query(struct rfkill *rfkill, void *data)
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{
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int status;
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int bit = (unsigned long)data + 16;
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int hwswitch_bit = (unsigned long)data - 1;
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get_buffer();
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dell_send_request(buffer, 17, 11);
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@ -272,7 +294,9 @@ static void dell_rfkill_query(struct rfkill *rfkill, void *data)
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release_buffer();
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rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
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rfkill_set_hw_state(rfkill, !(status & BIT(16)));
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if (hwswitch_state & (BIT(hwswitch_bit)))
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rfkill_set_hw_state(rfkill, !(status & BIT(16)));
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}
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static const struct rfkill_ops dell_rfkill_ops = {
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@ -306,6 +330,9 @@ static int __init dell_setup_rfkill(void)
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get_buffer();
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dell_send_request(buffer, 17, 11);
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status = buffer->output[1];
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buffer->input[0] = 0x2;
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dell_send_request(buffer, 17, 11);
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hwswitch_state = buffer->output[1];
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release_buffer();
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if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
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