static void disable_unused_touchscreen(void *unused)
{
struct device *i2c0 = PCH_DEV_I2C0;
struct bus *i2c_slaves = i2c0->link_list;
struct device *slave = i2c_slaves->children;
char touchscreen_hid[9] = CONFIG_TOUCHSCREEN_HID;
struct drivers_i2c_hid_config *info;
/* Look for VPD key that indicates which touchscreen is present */
if (CONFIG(VPD) &&
!vpd_gets(TOUCHSCREEN_VPD_KEY, touchscreen_hid,
ARRAY_SIZE(touchscreen_hid), VPD_ANY))
printk(BIOS_INFO, "%s: VPD key '%s' not found, default to %s\n",
__func__, TOUCHSCREEN_VPD_KEY, touchscreen_hid);
/* Go through all I2C slave devices on this bus */
while (slave) {
/* Find all the I2C slaves with the matching address */
if (slave->path.type == DEVICE_PATH_I2C &&
slave->path.i2c.device == TOUCHSCREEN_I2C_ADDR) {
info = slave->chip_info;
/* Disable all devices except the matching HID */
if (strncmp(info->generic.hid, touchscreen_hid,
ARRAY_SIZE(touchscreen_hid))) {
printk(BIOS_INFO, "%s: Disable %s\n", __func__,
info->generic.hid);
slave->enabled = 0;
} else {
printk(BIOS_INFO, "%s: Enable %s\n", __func__,
info->generic.hid);
}
}
slave = slave->sibling;
}
}
/* Retrieve the wifi SAR limits data from VPD and decode it
For VPD: key,value pair is in this format
"wifi_sar"=[<WRDD><EWRD>][WGDS]
WIFI SAR data in CBFS file is expected in same format: [<WRDD><EWRD>][WGDS]
[<WRDD><EWRD>] = NUM_SAR_LIMITS * BYTES_PER_SAR_LIMIT bytes.
[WGDS]=[WGDS_VERSION][WGDS_DATA]
For [WGDS_VERSION] 0x00,
[WGDS_DATA] = [GROUP#0][GROUP#1][GROUP#2]
[GROUP#<i>] =
[2.4Ghz – Max Allowed][2.4Ghz – Chain A Offset]
[2.4Ghz – Chain B Offset][5Ghz – Max Allowed]
[5Ghz – Chain A Offset][5Ghz – Chain B Offset]
[GROUP#0] is for FCC
[GROUP#1] is for Europe/Japan
[GROUP#2] is for ROW
*/
int get_wifi_sar_limits(struct wifi_sar_limits *sar_limits)
{
const char *wifi_sar_limit_key = CROS_VPD_WIFI_SAR_NAME;
/* vpd_gets() reads in one less than size characters from the VPD
* with a terminating null byte ('\0') stored as the last character into
* the buffer, thus the increasing by 1 for buffer_size. */
const size_t buffer_size = (sizeof(struct wifi_sar_limits) /
sizeof(uint8_t)) * 2 + 1;
char wifi_sar_limit_str[buffer_size];
uint8_t bin_buffer[sizeof(struct wifi_sar_limits)];
size_t sar_cbfs_len, sar_expected_len, bin_buff_adjusted_size;
/* keep it backward compatible. Some older platform are shipping
without GEO SAR and so older wifi_sar VPD key */
sar_expected_len = buffer_size;
bin_buff_adjusted_size = sizeof(struct wifi_sar_limits);
if (!IS_ENABLED(CONFIG_GEO_SAR_ENABLE)) {
sar_expected_len = buffer_size -
sizeof(struct wifi_sar_delta_table) *
sizeof(uint8_t) * 2;
bin_buff_adjusted_size = sizeof(struct wifi_sar_limits) -
sizeof(struct wifi_sar_delta_table);
}
/* Try to read the SAR limit entry from VPD */
if (!vpd_gets(wifi_sar_limit_key, wifi_sar_limit_str,
buffer_size, VPD_ANY)) {
printk(BIOS_ERR, "Error: Could not locate '%s' in VPD.\n",
wifi_sar_limit_key);
if (!IS_ENABLED(CONFIG_WIFI_SAR_CBFS))
return -1;
printk(BIOS_DEBUG, "Checking CBFS for default SAR values\n");
sar_cbfs_len = load_sar_file_from_cbfs(
(void *) wifi_sar_limit_str,
sar_expected_len);
if (sar_cbfs_len != sar_expected_len) {
printk(BIOS_ERR, "%s has bad len in CBFS\n",
WIFI_SAR_CBFS_FILENAME);
return -1;
}
} else {
/* VPD key "wifi_sar" found. strlen is checked with addition of
* 1 as we have created buffer size 1 char larger for the reason
* mentioned at start of this function itself */
if (strlen(wifi_sar_limit_str) + 1 != sar_expected_len) {
printk(BIOS_ERR, "WIFI SAR key has bad len in VPD\n");
return -1;
}
}
/* Decode the heximal encoded string to binary values */
if (hexstrtobin(wifi_sar_limit_str, bin_buffer, bin_buff_adjusted_size)
< bin_buff_adjusted_size) {
printk(BIOS_ERR, "Error: wifi_sar contains non-hex value!\n");
return -1;
}
memset(sar_limits, 0, sizeof(*sar_limits));
memcpy(sar_limits, bin_buffer, bin_buff_adjusted_size);
return 0;
}
