cx25840-vbi.c

  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
 13static 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
 22static 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
 72int 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
117int 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
137int 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
216int 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}