1 // SPDX-License-Identifier: GPL-2.0-or-later
9 #include "cx88-reg.h"
77 		return -int_cos(x - INT_PI);  in int_cos()
80 		return -int_cos(INT_PI / 2 - (x % (INT_PI / 2)));  in int_cos()
89 	ret = 32768 - t2 + t4 - t6 + t8;  in int_cos()
108 		s32 s = x[i] + ((s64)coeff * s_prev / 32768) - s_prev2;  in int_goertzel()
114 	tmp = (s64)s_prev2 * s_prev2 + (s64)s_prev * s_prev -  in int_goertzel()
118 	 * XXX: N must be low enough so that N*N fits in s32.  in int_goertzel()
142 		/* The last 192 samples are enough for noise detection */  in noise_magnitude()
143 		x += (N - 192);  in noise_magnitude()
147 	freq_step = (freq_end - freq_start) / (samples - 1);  in noise_magnitude()
159 	s32 carrier, stereo, dual, noise;  in detect_a2_a2m_eiaj()  local
163 	switch (core->tvaudio) {  in detect_a2_a2m_eiaj()
182 			core->tvaudio, __func__);  in detect_a2_a2m_eiaj()
189 	noise   = noise_magnitude(x, N, FREQ_NOISE_START, FREQ_NOISE_END);  in detect_a2_a2m_eiaj()
192 		"detect a2/a2m/eiaj: carrier=%d, stereo=%d, dual=%d, noise=%d\n",  in detect_a2_a2m_eiaj()
193 		carrier, stereo, dual, noise);  in detect_a2_a2m_eiaj()
200 	if (core->tvaudio == WW_EIAJ) {  in detect_a2_a2m_eiaj()
208 			 * so we probably don't need noise detection  in detect_a2_a2m_eiaj()
216 		    (noise < 10) &&  in detect_a2_a2m_eiaj()
243 	unsigned int bpl = srch->fifo_size / AUD_RDS_LINES;  in read_rds_samples()
245 	unsigned int sample_count = spl * (AUD_RDS_LINES - 1);  in read_rds_samples()
247 	u32 current_address = cx_read(srch->ptr1_reg);  in read_rds_samples()
248 	u32 offset = (current_address - srch->fifo_start + bpl);  in read_rds_samples()
253 		current_address - srch->fifo_start, sample_count,  in read_rds_samples()
263 		samples[i] = cx_read(srch->fifo_start + offset);  in read_rds_samples()
285 	if (time_before(jiffies, core->last_change + msecs_to_jiffies(500)))  in cx88_dsp_detect_stereo_sap()
293 	switch (core->tvaudio) {  in cx88_dsp_detect_stereo_sap()