1 // SPDX-License-Identifier: GPL-2.0-only
3 // Common code for Cirrus Logic Smart Amplifiers
5 // Copyright (C) 2024 Cirrus Logic, Inc. and
6 // Cirrus Logic International Semiconductor Ltd.
8 #include <asm/byteorder.h>
9 #include <kunit/static_stub.h>
10 #include <linux/dev_printk.h>
11 #include <linux/efi.h>
12 #include <linux/firmware/cirrus/cs_dsp.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/types.h>
16 #include <sound/cs-amp-lib.h>
18 #define CS_AMP_CAL_GUID \
19 EFI_GUID(0x02f9af02, 0x7734, 0x4233, 0xb4, 0x3d, 0x93, 0xfe, 0x5a, 0xa3, 0x5d, 0xb3)
21 #define CS_AMP_CAL_NAME L"CirrusSmartAmpCalibrationData"
23 static int cs_amp_write_cal_coeff(struct cs_dsp *dsp,
24 const struct cirrus_amp_cal_controls *controls,
25 const char *ctl_name, u32 val)
27 struct cs_dsp_coeff_ctl *cs_ctl;
28 __be32 beval = cpu_to_be32(val);
31 KUNIT_STATIC_STUB_REDIRECT(cs_amp_write_cal_coeff, dsp, controls, ctl_name, val);
33 if (IS_REACHABLE(CONFIG_FW_CS_DSP)) {
34 mutex_lock(&dsp->pwr_lock);
35 cs_ctl = cs_dsp_get_ctl(dsp, ctl_name, controls->mem_region, controls->alg_id);
36 ret = cs_dsp_coeff_write_ctrl(cs_ctl, 0, &beval, sizeof(beval));
37 mutex_unlock(&dsp->pwr_lock);
40 dev_err(dsp->dev, "Failed to write to '%s': %d\n", ctl_name, ret);
50 static int _cs_amp_write_cal_coeffs(struct cs_dsp *dsp,
51 const struct cirrus_amp_cal_controls *controls,
52 const struct cirrus_amp_cal_data *data)
56 dev_dbg(dsp->dev, "Calibration: Ambient=%#x, Status=%#x, CalR=%d\n",
57 data->calAmbient, data->calStatus, data->calR);
59 if (list_empty(&dsp->ctl_list)) {
60 dev_info(dsp->dev, "Calibration disabled due to missing firmware controls\n");
64 ret = cs_amp_write_cal_coeff(dsp, controls, controls->ambient, data->calAmbient);
68 ret = cs_amp_write_cal_coeff(dsp, controls, controls->calr, data->calR);
72 ret = cs_amp_write_cal_coeff(dsp, controls, controls->status, data->calStatus);
76 ret = cs_amp_write_cal_coeff(dsp, controls, controls->checksum, data->calR + 1);
84 * cs_amp_write_cal_coeffs - Write calibration data to firmware controls.
85 * @dsp: Pointer to struct cs_dsp.
86 * @controls: Pointer to definition of firmware controls to be written.
87 * @data: Pointer to calibration data.
89 * Returns: 0 on success, else negative error value.
91 int cs_amp_write_cal_coeffs(struct cs_dsp *dsp,
92 const struct cirrus_amp_cal_controls *controls,
93 const struct cirrus_amp_cal_data *data)
95 if (IS_REACHABLE(CONFIG_FW_CS_DSP) || IS_ENABLED(CONFIG_SND_SOC_CS_AMP_LIB_TEST))
96 return _cs_amp_write_cal_coeffs(dsp, controls, data);
100 EXPORT_SYMBOL_NS_GPL(cs_amp_write_cal_coeffs, SND_SOC_CS_AMP_LIB);
102 static efi_status_t cs_amp_get_efi_variable(efi_char16_t *name,
109 KUNIT_STATIC_STUB_REDIRECT(cs_amp_get_efi_variable, name, guid, size, buf);
111 if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
112 return efi.get_variable(name, guid, &attr, size, buf);
114 return EFI_NOT_FOUND;
117 static struct cirrus_amp_efi_data *cs_amp_get_cal_efi_buffer(struct device *dev)
119 struct cirrus_amp_efi_data *efi_data;
120 unsigned long data_size = 0;
125 /* Get real size of UEFI variable */
126 status = cs_amp_get_efi_variable(CS_AMP_CAL_NAME, &CS_AMP_CAL_GUID, &data_size, NULL);
127 if (status != EFI_BUFFER_TOO_SMALL)
128 return ERR_PTR(-ENOENT);
130 if (data_size < sizeof(*efi_data)) {
131 dev_err(dev, "EFI cal variable truncated\n");
132 return ERR_PTR(-EOVERFLOW);
135 /* Get variable contents into buffer */
136 data = kmalloc(data_size, GFP_KERNEL);
138 return ERR_PTR(-ENOMEM);
140 status = cs_amp_get_efi_variable(CS_AMP_CAL_NAME, &CS_AMP_CAL_GUID, &data_size, data);
141 if (status != EFI_SUCCESS) {
146 efi_data = (struct cirrus_amp_efi_data *)data;
147 dev_dbg(dev, "Calibration: Size=%d, Amp Count=%d\n", efi_data->size, efi_data->count);
149 if ((efi_data->count > 128) ||
150 offsetof(struct cirrus_amp_efi_data, data[efi_data->count]) > data_size) {
151 dev_err(dev, "EFI cal variable truncated\n");
160 dev_err(dev, "Failed to read calibration data from EFI: %d\n", ret);
165 static u64 cs_amp_cal_target_u64(const struct cirrus_amp_cal_data *data)
167 return ((u64)data->calTarget[1] << 32) | data->calTarget[0];
170 static int _cs_amp_get_efi_calibration_data(struct device *dev, u64 target_uid, int amp_index,
171 struct cirrus_amp_cal_data *out_data)
173 struct cirrus_amp_efi_data *efi_data;
174 struct cirrus_amp_cal_data *cal = NULL;
177 efi_data = cs_amp_get_cal_efi_buffer(dev);
178 if (IS_ERR(efi_data))
179 return PTR_ERR(efi_data);
182 for (i = 0; i < efi_data->count; ++i) {
183 u64 cal_target = cs_amp_cal_target_u64(&efi_data->data[i]);
185 /* Skip entries with unpopulated silicon ID */
189 if (cal_target == target_uid) {
190 cal = &efi_data->data[i];
196 if (!cal && (amp_index >= 0) && (amp_index < efi_data->count)) {
197 u64 cal_target = cs_amp_cal_target_u64(&efi_data->data[amp_index]);
200 * Treat unpopulated cal_target as a wildcard.
201 * If target_uid != 0 we can only get here if cal_target == 0
202 * or it didn't match any cal_target value.
203 * If target_uid == 0 it is a wildcard.
205 if ((cal_target == 0) || (target_uid == 0))
206 cal = &efi_data->data[amp_index];
208 dev_warn(dev, "Calibration entry %d does not match silicon ID", amp_index);
212 memcpy(out_data, cal, sizeof(*out_data));
215 dev_warn(dev, "No calibration for silicon ID %#llx\n", target_uid);
225 * cs_amp_get_efi_calibration_data - get an entry from calibration data in EFI.
226 * @dev: struct device of the caller.
227 * @target_uid: UID to match, or zero to ignore UID matching.
228 * @amp_index: Entry index to use, or -1 to prevent lookup by index.
229 * @out_data: struct cirrus_amp_cal_data where the entry will be copied.
231 * This function can perform 3 types of lookup:
233 * (target_uid > 0, amp_index >= 0)
234 * UID search with fallback to using the array index.
235 * Search the calibration data for a non-zero calTarget that matches
236 * target_uid, and if found return that entry. Else, if the entry at
237 * [amp_index] has calTarget == 0, return that entry. Else fail.
239 * (target_uid > 0, amp_index < 0)
241 * Search the calibration data for a non-zero calTarget that matches
242 * target_uid, and if found return that entry. Else fail.
244 * (target_uid == 0, amp_index >= 0)
245 * Array index fetch only.
246 * Return the entry at [amp_index].
248 * An array lookup will be skipped if amp_index exceeds the number of
249 * entries in the calibration array, and in this case the return will
250 * be -ENOENT. An out-of-range amp_index does not prevent matching by
251 * target_uid - it has the same effect as passing amp_index < 0.
253 * If the EFI data is too short to be a valid entry, or the entry count
254 * in the EFI data overflows the actual length of the data, this function
255 * returns -EOVERFLOW.
257 * Return: 0 if the entry was found, -ENOENT if no entry was found,
258 * -EOVERFLOW if the EFI file is corrupt, else other error value.
260 int cs_amp_get_efi_calibration_data(struct device *dev, u64 target_uid, int amp_index,
261 struct cirrus_amp_cal_data *out_data)
263 if (IS_ENABLED(CONFIG_EFI) || IS_ENABLED(CONFIG_SND_SOC_CS_AMP_LIB_TEST))
264 return _cs_amp_get_efi_calibration_data(dev, target_uid, amp_index, out_data);
268 EXPORT_SYMBOL_NS_GPL(cs_amp_get_efi_calibration_data, SND_SOC_CS_AMP_LIB);
270 static const struct cs_amp_test_hooks cs_amp_test_hook_ptrs = {
271 .get_efi_variable = cs_amp_get_efi_variable,
272 .write_cal_coeff = cs_amp_write_cal_coeff,
275 const struct cs_amp_test_hooks * const cs_amp_test_hooks =
276 PTR_IF(IS_ENABLED(CONFIG_SND_SOC_CS_AMP_LIB_TEST), &cs_amp_test_hook_ptrs);
277 EXPORT_SYMBOL_NS_GPL(cs_amp_test_hooks, SND_SOC_CS_AMP_LIB);
279 MODULE_DESCRIPTION("Cirrus Logic amplifier library");
281 MODULE_LICENSE("GPL");
282 MODULE_IMPORT_NS(FW_CS_DSP);