1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * helper functions for HDMI models (Xonar HDAV1.3/HDAV1.3 Slim)
4  *
5  * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
6  */
7 
8 #include <linux/pci.h>
9 #include <linux/delay.h>
10 #include <sound/asoundef.h>
11 #include <sound/control.h>
12 #include <sound/core.h>
13 #include <sound/pcm.h>
14 #include <sound/pcm_params.h>
15 #include <sound/tlv.h>
16 #include "xonar.h"
17 
hdmi_write_command(struct oxygen * chip,u8 command,unsigned int count,const u8 * params)18 static void hdmi_write_command(struct oxygen *chip, u8 command,
19 			       unsigned int count, const u8 *params)
20 {
21 	unsigned int i;
22 	u8 checksum;
23 
24 	oxygen_write_uart(chip, 0xfb);
25 	oxygen_write_uart(chip, 0xef);
26 	oxygen_write_uart(chip, command);
27 	oxygen_write_uart(chip, count);
28 	for (i = 0; i < count; ++i)
29 		oxygen_write_uart(chip, params[i]);
30 	checksum = 0xfb + 0xef + command + count;
31 	for (i = 0; i < count; ++i)
32 		checksum += params[i];
33 	oxygen_write_uart(chip, checksum);
34 }
35 
xonar_hdmi_init_commands(struct oxygen * chip,struct xonar_hdmi * hdmi)36 static void xonar_hdmi_init_commands(struct oxygen *chip,
37 				     struct xonar_hdmi *hdmi)
38 {
39 	u8 param;
40 
41 	oxygen_reset_uart(chip);
42 	param = 0;
43 	hdmi_write_command(chip, 0x61, 1, &param);
44 	param = 1;
45 	hdmi_write_command(chip, 0x74, 1, &param);
46 	hdmi_write_command(chip, 0x54, 5, hdmi->params);
47 }
48 
xonar_hdmi_init(struct oxygen * chip,struct xonar_hdmi * hdmi)49 void xonar_hdmi_init(struct oxygen *chip, struct xonar_hdmi *hdmi)
50 {
51 	hdmi->params[1] = IEC958_AES3_CON_FS_48000;
52 	hdmi->params[4] = 1;
53 	xonar_hdmi_init_commands(chip, hdmi);
54 }
55 
xonar_hdmi_cleanup(struct oxygen * chip)56 void xonar_hdmi_cleanup(struct oxygen *chip)
57 {
58 	u8 param = 0;
59 
60 	hdmi_write_command(chip, 0x74, 1, &param);
61 }
62 
xonar_hdmi_resume(struct oxygen * chip,struct xonar_hdmi * hdmi)63 void xonar_hdmi_resume(struct oxygen *chip, struct xonar_hdmi *hdmi)
64 {
65 	xonar_hdmi_init_commands(chip, hdmi);
66 }
67 
xonar_hdmi_pcm_hardware_filter(unsigned int channel,struct snd_pcm_hardware * hardware)68 void xonar_hdmi_pcm_hardware_filter(unsigned int channel,
69 				    struct snd_pcm_hardware *hardware)
70 {
71 	if (channel == PCM_MULTICH) {
72 		hardware->rates = SNDRV_PCM_RATE_44100 |
73 				  SNDRV_PCM_RATE_48000 |
74 				  SNDRV_PCM_RATE_96000 |
75 				  SNDRV_PCM_RATE_192000;
76 		hardware->rate_min = 44100;
77 	}
78 }
79 
xonar_set_hdmi_params(struct oxygen * chip,struct xonar_hdmi * hdmi,struct snd_pcm_hw_params * params)80 void xonar_set_hdmi_params(struct oxygen *chip, struct xonar_hdmi *hdmi,
81 			   struct snd_pcm_hw_params *params)
82 {
83 	hdmi->params[0] = 0; /* 1 = non-audio */
84 	switch (params_rate(params)) {
85 	case 44100:
86 		hdmi->params[1] = IEC958_AES3_CON_FS_44100;
87 		break;
88 	case 48000:
89 		hdmi->params[1] = IEC958_AES3_CON_FS_48000;
90 		break;
91 	default: /* 96000 */
92 		hdmi->params[1] = IEC958_AES3_CON_FS_96000;
93 		break;
94 	case 192000:
95 		hdmi->params[1] = IEC958_AES3_CON_FS_192000;
96 		break;
97 	}
98 	hdmi->params[2] = params_channels(params) / 2 - 1;
99 	if (params_format(params) == SNDRV_PCM_FORMAT_S16_LE)
100 		hdmi->params[3] = 0;
101 	else
102 		hdmi->params[3] = 0xc0;
103 	hdmi->params[4] = 1; /* ? */
104 	hdmi_write_command(chip, 0x54, 5, hdmi->params);
105 }
106 
xonar_hdmi_uart_input(struct oxygen * chip)107 void xonar_hdmi_uart_input(struct oxygen *chip)
108 {
109 	if (chip->uart_input_count >= 2 &&
110 	    chip->uart_input[chip->uart_input_count - 2] == 'O' &&
111 	    chip->uart_input[chip->uart_input_count - 1] == 'K') {
112 		dev_dbg(chip->card->dev, "message from HDMI chip received:\n");
113 		print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
114 				     chip->uart_input, chip->uart_input_count);
115 		chip->uart_input_count = 0;
116 	}
117 }
118