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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-04 18:09:57 +00:00
hp-wmi: allow setting input and output buffer sizes separately
Split buffersize parameter of hp_wmi_perform_query to insize and outsize. Existing callers are changed to use the same value for insize and outsize to avoid any regressions, with the exception of hp_wmi_set_block where the output buffer is unused and therefore outsize is set to 0 (this change is not seen by BIOS code). The maximum input buffer size is kept at 4 bytes as per struct bios_args. Some commands exist that take longer buffers, but they haven't been implemented. The data portion of bios_args can be trivially made dynamically allocated later when such larger buffers become needed. Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi> Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
parent
25bb067a08
commit
c3021ea1be
1 changed files with 39 additions and 24 deletions
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@ -86,7 +86,6 @@ struct bios_args {
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struct bios_return {
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u32 sigpass;
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u32 return_code;
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u32 value;
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};
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enum hp_return_value {
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@ -136,7 +135,8 @@ static struct platform_driver hp_wmi_driver = {
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* query: The commandtype -> What should be queried
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* write: The command -> 0 read, 1 write, 3 ODM specific
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* buffer: Buffer used as input and/or output
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* buffersize: Size of buffer
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* insize: Size of input buffer
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* outsize: Size of output buffer
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*
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* returns zero on success
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* an HP WMI query specific error code (which is positive)
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@ -147,23 +147,28 @@ static struct platform_driver hp_wmi_driver = {
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* size. E.g. Battery info query (0x7) is defined to have 1 byte input
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* and 128 byte output. The caller would do:
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* buffer = kzalloc(128, GFP_KERNEL);
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* ret = hp_wmi_perform_query(0x7, 0, buffer, 128)
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* ret = hp_wmi_perform_query(0x7, 0, buffer, 1, 128)
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*/
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static int hp_wmi_perform_query(int query, int write, u32 *buffer,
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int buffersize)
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static int hp_wmi_perform_query(int query, int write, void *buffer,
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int insize, int outsize)
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{
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struct bios_return bios_return;
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struct bios_return *bios_return;
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int actual_outsize;
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union acpi_object *obj;
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struct bios_args args = {
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.signature = 0x55434553,
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.command = write ? 0x2 : 0x1,
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.commandtype = query,
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.datasize = buffersize,
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.data = *buffer,
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.datasize = insize,
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.data = 0,
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};
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struct acpi_buffer input = { sizeof(struct bios_args), &args };
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struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
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if (WARN_ON(insize > sizeof(args.data)))
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return -EINVAL;
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memcpy(&args.data, buffer, insize);
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wmi_evaluate_method(HPWMI_BIOS_GUID, 0, 0x3, &input, &output);
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obj = output.pointer;
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@ -175,19 +180,26 @@ static int hp_wmi_perform_query(int query, int write, u32 *buffer,
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return -EINVAL;
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}
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bios_return = *((struct bios_return *)obj->buffer.pointer);
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bios_return = (struct bios_return *)obj->buffer.pointer;
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if (bios_return.return_code) {
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if (bios_return.return_code != HPWMI_RET_UNKNOWN_CMDTYPE)
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if (bios_return->return_code) {
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if (bios_return->return_code != HPWMI_RET_UNKNOWN_CMDTYPE)
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printk(KERN_WARNING PREFIX "query 0x%x returned "
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"error 0x%x\n",
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query, bios_return.return_code);
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query, bios_return->return_code);
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kfree(obj);
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return bios_return.return_code;
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return bios_return->return_code;
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}
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memcpy(buffer, &bios_return.value, sizeof(bios_return.value));
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if (!outsize) {
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/* ignore output data */
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kfree(obj);
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return 0;
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}
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actual_outsize = min(outsize, (int)(obj->buffer.length - sizeof(*bios_return)));
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memcpy(buffer, obj->buffer.pointer + sizeof(*bios_return), actual_outsize);
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memset(buffer + actual_outsize, 0, outsize - actual_outsize);
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kfree(obj);
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return 0;
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}
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@ -196,7 +208,7 @@ static int hp_wmi_display_state(void)
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{
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int state = 0;
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int ret = hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, 0, &state,
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sizeof(state));
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sizeof(state), sizeof(state));
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if (ret)
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return -EINVAL;
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return state;
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@ -206,7 +218,7 @@ static int hp_wmi_hddtemp_state(void)
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{
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int state = 0;
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int ret = hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, 0, &state,
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sizeof(state));
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sizeof(state), sizeof(state));
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if (ret)
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return -EINVAL;
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return state;
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@ -216,7 +228,7 @@ static int hp_wmi_als_state(void)
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{
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int state = 0;
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int ret = hp_wmi_perform_query(HPWMI_ALS_QUERY, 0, &state,
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sizeof(state));
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sizeof(state), sizeof(state));
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if (ret)
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return -EINVAL;
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return state;
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@ -226,7 +238,7 @@ static int hp_wmi_dock_state(void)
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{
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int state = 0;
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int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, &state,
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sizeof(state));
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sizeof(state), sizeof(state));
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if (ret)
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return -EINVAL;
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@ -238,7 +250,7 @@ static int hp_wmi_tablet_state(void)
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{
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int state = 0;
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int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, &state,
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sizeof(state));
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sizeof(state), sizeof(state));
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if (ret)
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return ret;
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@ -252,7 +264,7 @@ static int hp_wmi_set_block(void *data, bool blocked)
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int ret;
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ret = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1,
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&query, sizeof(query));
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&query, sizeof(query), 0);
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if (ret)
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return -EINVAL;
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return 0;
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@ -267,7 +279,8 @@ static bool hp_wmi_get_sw_state(enum hp_wmi_radio r)
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int wireless = 0;
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int mask;
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hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0,
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&wireless, sizeof(wireless));
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&wireless, sizeof(wireless),
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sizeof(wireless));
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/* TBD: Pass error */
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mask = 0x200 << (r * 8);
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@ -283,7 +296,8 @@ static bool hp_wmi_get_hw_state(enum hp_wmi_radio r)
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int wireless = 0;
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int mask;
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hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0,
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&wireless, sizeof(wireless));
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&wireless, sizeof(wireless),
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sizeof(wireless));
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/* TBD: Pass error */
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mask = 0x800 << (r * 8);
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@ -344,7 +358,7 @@ static ssize_t set_als(struct device *dev, struct device_attribute *attr,
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{
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u32 tmp = simple_strtoul(buf, NULL, 10);
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int ret = hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, &tmp,
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sizeof(tmp));
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sizeof(tmp), sizeof(tmp));
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if (ret)
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return -EINVAL;
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@ -417,6 +431,7 @@ static void hp_wmi_notify(u32 value, void *context)
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case HPWMI_BEZEL_BUTTON:
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ret = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,
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&key_code,
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sizeof(key_code),
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sizeof(key_code));
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if (ret)
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break;
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@ -523,7 +538,7 @@ static int __devinit hp_wmi_bios_setup(struct platform_device *device)
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int wireless = 0;
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err = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, &wireless,
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sizeof(wireless));
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sizeof(wireless), sizeof(wireless));
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if (err)
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return err;
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