1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* cx25840 VBI functions
3  */
4 
5 
6 #include <linux/videodev2.h>
7 #include <linux/i2c.h>
8 #include <media/v4l2-common.h>
9 #include <media/drv-intf/cx25840.h>
10 
11 #include "cx25840-core.h"
12 
13 static int odd_parity(u8 c)
14 {
15 	c ^= (c >> 4);
16 	c ^= (c >> 2);
17 	c ^= (c >> 1);
18 
19 	return c & 1;
20 }
21 
22 static int decode_vps(u8 * dst, u8 * p)
23 {
24 	static const u8 biphase_tbl[] = {
25 		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
26 		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
27 		0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
28 		0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
29 		0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
30 		0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
31 		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
32 		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
33 		0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
34 		0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
35 		0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
36 		0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
37 		0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
38 		0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
39 		0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
40 		0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
41 		0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
42 		0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
43 		0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
44 		0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
45 		0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
46 		0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
47 		0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
48 		0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
49 		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
50 		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
51 		0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
52 		0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
53 		0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
54 		0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
55 		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
56 		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
57 	};
58 
59 	u8 c, err = 0;
60 	int i;
61 
62 	for (i = 0; i < 2 * 13; i += 2) {
63 		err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]];
64 		c = (biphase_tbl[p[i + 1]] & 0xf) |
65 		    ((biphase_tbl[p[i]] & 0xf) << 4);
66 		dst[i / 2] = c;
67 	}
68 
69 	return err & 0xf0;
70 }
71 
72 int cx25840_g_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
73 {
74 	struct i2c_client *client = v4l2_get_subdevdata(sd);
75 	struct cx25840_state *state = to_state(sd);
76 	static const u16 lcr2vbi[] = {
77 		0, V4L2_SLICED_TELETEXT_B, 0,	/* 1 */
78 		0, V4L2_SLICED_WSS_625, 0,	/* 4 */
79 		V4L2_SLICED_CAPTION_525,	/* 6 */
80 		0, 0, V4L2_SLICED_VPS, 0, 0,	/* 9 */
81 		0, 0, 0, 0
82 	};
83 	int is_pal = !(state->std & V4L2_STD_525_60);
84 	int i;
85 
86 	memset(svbi->service_lines, 0, sizeof(svbi->service_lines));
87 	svbi->service_set = 0;
88 	/* we're done if raw VBI is active */
89 	/* TODO: this will have to be changed for generic_mode VBI */
90 	if ((cx25840_read(client, 0x404) & 0x10) == 0)
91 		return 0;
92 
93 	if (is_pal) {
94 		for (i = 7; i <= 23; i++) {
95 			u8 v = cx25840_read(client,
96 				 state->vbi_regs_offset + 0x424 + i - 7);
97 
98 			svbi->service_lines[0][i] = lcr2vbi[v >> 4];
99 			svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
100 			svbi->service_set |= svbi->service_lines[0][i] |
101 					     svbi->service_lines[1][i];
102 		}
103 	} else {
104 		for (i = 10; i <= 21; i++) {
105 			u8 v = cx25840_read(client,
106 				state->vbi_regs_offset + 0x424 + i - 10);
107 
108 			svbi->service_lines[0][i] = lcr2vbi[v >> 4];
109 			svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
110 			svbi->service_set |= svbi->service_lines[0][i] |
111 					     svbi->service_lines[1][i];
112 		}
113 	}
114 	return 0;
115 }
116 
117 int cx25840_s_raw_fmt(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt)
118 {
119 	struct i2c_client *client = v4l2_get_subdevdata(sd);
120 	struct cx25840_state *state = to_state(sd);
121 	int is_pal = !(state->std & V4L2_STD_525_60);
122 	int vbi_offset = is_pal ? 1 : 0;
123 
124 	/* Setup standard */
125 	cx25840_std_setup(client);
126 
127 	/* VBI Offset */
128 	if (is_cx23888(state))
129 		cx25840_write(client, 0x54f, vbi_offset);
130 	else
131 		cx25840_write(client, 0x47f, vbi_offset);
132 	/* TODO: this will have to be changed for generic_mode VBI */
133 	cx25840_write(client, 0x404, 0x2e);
134 	return 0;
135 }
136 
137 int cx25840_s_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
138 {
139 	struct i2c_client *client = v4l2_get_subdevdata(sd);
140 	struct cx25840_state *state = to_state(sd);
141 	int is_pal = !(state->std & V4L2_STD_525_60);
142 	int vbi_offset = is_pal ? 1 : 0;
143 	int i, x;
144 	u8 lcr[24];
145 
146 	for (x = 0; x <= 23; x++)
147 		lcr[x] = 0x00;
148 
149 	/* Setup standard */
150 	cx25840_std_setup(client);
151 
152 	/* Sliced VBI */
153 	/* TODO: this will have to be changed for generic_mode VBI */
154 	cx25840_write(client, 0x404, 0x32);	/* Ancillary data */
155 	cx25840_write(client, 0x406, 0x13);
156 	if (is_cx23888(state))
157 		cx25840_write(client, 0x54f, vbi_offset);
158 	else
159 		cx25840_write(client, 0x47f, vbi_offset);
160 
161 	if (is_pal) {
162 		for (i = 0; i <= 6; i++)
163 			svbi->service_lines[0][i] =
164 				svbi->service_lines[1][i] = 0;
165 	} else {
166 		for (i = 0; i <= 9; i++)
167 			svbi->service_lines[0][i] =
168 				svbi->service_lines[1][i] = 0;
169 
170 		for (i = 22; i <= 23; i++)
171 			svbi->service_lines[0][i] =
172 				svbi->service_lines[1][i] = 0;
173 	}
174 
175 	for (i = 7; i <= 23; i++) {
176 		for (x = 0; x <= 1; x++) {
177 			switch (svbi->service_lines[1-x][i]) {
178 			case V4L2_SLICED_TELETEXT_B:
179 				lcr[i] |= 1 << (4 * x);
180 				break;
181 			case V4L2_SLICED_WSS_625:
182 				lcr[i] |= 4 << (4 * x);
183 				break;
184 			case V4L2_SLICED_CAPTION_525:
185 				lcr[i] |= 6 << (4 * x);
186 				break;
187 			case V4L2_SLICED_VPS:
188 				lcr[i] |= 9 << (4 * x);
189 				break;
190 			}
191 		}
192 	}
193 
194 	if (is_pal) {
195 		for (x = 1, i = state->vbi_regs_offset + 0x424;
196 		     i <= state->vbi_regs_offset + 0x434; i++, x++)
197 			cx25840_write(client, i, lcr[6 + x]);
198 	} else {
199 		for (x = 1, i = state->vbi_regs_offset + 0x424;
200 		     i <= state->vbi_regs_offset + 0x430; i++, x++)
201 			cx25840_write(client, i, lcr[9 + x]);
202 		for (i = state->vbi_regs_offset + 0x431;
203 		     i <= state->vbi_regs_offset + 0x434; i++)
204 			cx25840_write(client, i, 0);
205 	}
206 
207 	cx25840_write(client, state->vbi_regs_offset + 0x43c, 0x16);
208 	/* TODO: this will have to be changed for generic_mode VBI */
209 	if (is_cx23888(state))
210 		cx25840_write(client, 0x428, is_pal ? 0x2a : 0x22);
211 	else
212 		cx25840_write(client, 0x474, is_pal ? 0x2a : 0x22);
213 	return 0;
214 }
215 
216 int cx25840_decode_vbi_line(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi)
217 {
218 	struct cx25840_state *state = to_state(sd);
219 	u8 *p = vbi->p;
220 	int id1, id2, l, err = 0;
221 
222 	if (p[0] || p[1] != 0xff || p[2] != 0xff ||
223 			(p[3] != 0x55 && p[3] != 0x91)) {
224 		vbi->line = vbi->type = 0;
225 		return 0;
226 	}
227 
228 	p += 4;
229 	id1 = p[-1];
230 	id2 = p[0] & 0xf;
231 	l = p[2] & 0x3f;
232 	l += state->vbi_line_offset;
233 	p += 4;
234 
235 	switch (id2) {
236 	case 1:
237 		id2 = V4L2_SLICED_TELETEXT_B;
238 		break;
239 	case 4:
240 		id2 = V4L2_SLICED_WSS_625;
241 		break;
242 	case 6:
243 		id2 = V4L2_SLICED_CAPTION_525;
244 		err = !odd_parity(p[0]) || !odd_parity(p[1]);
245 		break;
246 	case 9:
247 		id2 = V4L2_SLICED_VPS;
248 		if (decode_vps(p, p) != 0)
249 			err = 1;
250 		break;
251 	default:
252 		id2 = 0;
253 		err = 1;
254 		break;
255 	}
256 
257 	vbi->type = err ? 0 : id2;
258 	vbi->line = err ? 0 : l;
259 	vbi->is_second_field = err ? 0 : (id1 == 0x55);
260 	vbi->p = p;
261 	return 0;
262 }
263