1/*
2 * ths7303/53- THS7303/53 Video Amplifier driver
3 *
4 * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
5 * Copyright 2013 Cisco Systems, Inc. and/or its affiliates.
6 *
7 * Author: Chaithrika U S <chaithrika@ti.com>
8 *
9 * Contributors:
10 *     Hans Verkuil <hans.verkuil@cisco.com>
11 *     Lad, Prabhakar <prabhakar.lad@ti.com>
12 *     Martin Bugge <marbugge@cisco.com>
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License as
16 * published by the Free Software Foundation version 2.
17 *
18 * This program is distributed .as is. WITHOUT ANY WARRANTY of any
19 * kind, whether express or implied; without even the implied warranty
20 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21 * GNU General Public License for more details.
22 */
23
24#include <linux/i2c.h>
25#include <linux/module.h>
26#include <linux/slab.h>
27
28#include <media/ths7303.h>
29#include <media/v4l2-device.h>
30
31#define THS7303_CHANNEL_1	1
32#define THS7303_CHANNEL_2	2
33#define THS7303_CHANNEL_3	3
34
35struct ths7303_state {
36	struct v4l2_subdev		sd;
37	const struct ths7303_platform_data *pdata;
38	struct v4l2_bt_timings		bt;
39	int std_id;
40	int stream_on;
41};
42
43enum ths7303_filter_mode {
44	THS7303_FILTER_MODE_480I_576I,
45	THS7303_FILTER_MODE_480P_576P,
46	THS7303_FILTER_MODE_720P_1080I,
47	THS7303_FILTER_MODE_1080P,
48	THS7303_FILTER_MODE_DISABLE
49};
50
51MODULE_DESCRIPTION("TI THS7303 video amplifier driver");
52MODULE_AUTHOR("Chaithrika U S");
53MODULE_LICENSE("GPL");
54
55static inline struct ths7303_state *to_state(struct v4l2_subdev *sd)
56{
57	return container_of(sd, struct ths7303_state, sd);
58}
59
60static int ths7303_read(struct v4l2_subdev *sd, u8 reg)
61{
62	struct i2c_client *client = v4l2_get_subdevdata(sd);
63
64	return i2c_smbus_read_byte_data(client, reg);
65}
66
67static int ths7303_write(struct v4l2_subdev *sd, u8 reg, u8 val)
68{
69	struct i2c_client *client = v4l2_get_subdevdata(sd);
70	int ret;
71	int i;
72
73	for (i = 0; i < 3; i++) {
74		ret = i2c_smbus_write_byte_data(client, reg, val);
75		if (ret == 0)
76			return 0;
77	}
78	return ret;
79}
80
81/* following function is used to set ths7303 */
82static int ths7303_setval(struct v4l2_subdev *sd,
83			  enum ths7303_filter_mode mode)
84{
85	struct i2c_client *client = v4l2_get_subdevdata(sd);
86	struct ths7303_state *state = to_state(sd);
87	const struct ths7303_platform_data *pdata = state->pdata;
88	u8 val, sel = 0;
89	int err, disable = 0;
90
91	if (!client)
92		return -EINVAL;
93
94	switch (mode) {
95	case THS7303_FILTER_MODE_1080P:
96		sel = 0x3;	/*1080p and SXGA/UXGA */
97		break;
98	case THS7303_FILTER_MODE_720P_1080I:
99		sel = 0x2;	/*720p, 1080i and SVGA/XGA */
100		break;
101	case THS7303_FILTER_MODE_480P_576P:
102		sel = 0x1;	/* EDTV 480p/576p and VGA */
103		break;
104	case THS7303_FILTER_MODE_480I_576I:
105		sel = 0x0;	/* SDTV, S-Video, 480i/576i */
106		break;
107	default:
108		/* disable all channels */
109		disable = 1;
110	}
111
112	val = (sel << 6) | (sel << 3);
113	if (!disable)
114		val |= (pdata->ch_1 & 0x27);
115	err = ths7303_write(sd, THS7303_CHANNEL_1, val);
116	if (err)
117		goto out;
118
119	val = (sel << 6) | (sel << 3);
120	if (!disable)
121		val |= (pdata->ch_2 & 0x27);
122	err = ths7303_write(sd, THS7303_CHANNEL_2, val);
123	if (err)
124		goto out;
125
126	val = (sel << 6) | (sel << 3);
127	if (!disable)
128		val |= (pdata->ch_3 & 0x27);
129	err = ths7303_write(sd, THS7303_CHANNEL_3, val);
130	if (err)
131		goto out;
132
133	return 0;
134out:
135	pr_info("write byte data failed\n");
136	return err;
137}
138
139static int ths7303_s_std_output(struct v4l2_subdev *sd, v4l2_std_id norm)
140{
141	struct ths7303_state *state = to_state(sd);
142
143	if (norm & (V4L2_STD_ALL & ~V4L2_STD_SECAM)) {
144		state->std_id = 1;
145		state->bt.pixelclock = 0;
146		return ths7303_setval(sd, THS7303_FILTER_MODE_480I_576I);
147	}
148
149	return ths7303_setval(sd, THS7303_FILTER_MODE_DISABLE);
150}
151
152static int ths7303_config(struct v4l2_subdev *sd)
153{
154	struct ths7303_state *state = to_state(sd);
155	int res;
156
157	if (!state->stream_on) {
158		ths7303_write(sd, THS7303_CHANNEL_1,
159			      (ths7303_read(sd, THS7303_CHANNEL_1) & 0xf8) |
160			      0x00);
161		ths7303_write(sd, THS7303_CHANNEL_2,
162			      (ths7303_read(sd, THS7303_CHANNEL_2) & 0xf8) |
163			      0x00);
164		ths7303_write(sd, THS7303_CHANNEL_3,
165			      (ths7303_read(sd, THS7303_CHANNEL_3) & 0xf8) |
166			      0x00);
167		return 0;
168	}
169
170	if (state->bt.pixelclock > 120000000)
171		res = ths7303_setval(sd, THS7303_FILTER_MODE_1080P);
172	else if (state->bt.pixelclock > 70000000)
173		res = ths7303_setval(sd, THS7303_FILTER_MODE_720P_1080I);
174	else if (state->bt.pixelclock > 20000000)
175		res = ths7303_setval(sd, THS7303_FILTER_MODE_480P_576P);
176	else if (state->std_id)
177		res = ths7303_setval(sd, THS7303_FILTER_MODE_480I_576I);
178	else
179		/* disable all channels */
180		res = ths7303_setval(sd, THS7303_FILTER_MODE_DISABLE);
181
182	return res;
183
184}
185
186static int ths7303_s_stream(struct v4l2_subdev *sd, int enable)
187{
188	struct ths7303_state *state = to_state(sd);
189
190	state->stream_on = enable;
191
192	return ths7303_config(sd);
193}
194
195/* for setting filter for HD output */
196static int ths7303_s_dv_timings(struct v4l2_subdev *sd,
197			       struct v4l2_dv_timings *dv_timings)
198{
199	struct ths7303_state *state = to_state(sd);
200
201	if (!dv_timings || dv_timings->type != V4L2_DV_BT_656_1120)
202		return -EINVAL;
203
204	state->bt = dv_timings->bt;
205	state->std_id = 0;
206
207	return ths7303_config(sd);
208}
209
210static const struct v4l2_subdev_video_ops ths7303_video_ops = {
211	.s_stream	= ths7303_s_stream,
212	.s_std_output	= ths7303_s_std_output,
213	.s_dv_timings   = ths7303_s_dv_timings,
214};
215
216#ifdef CONFIG_VIDEO_ADV_DEBUG
217
218static int ths7303_g_register(struct v4l2_subdev *sd,
219			      struct v4l2_dbg_register *reg)
220{
221	reg->size = 1;
222	reg->val = ths7303_read(sd, reg->reg);
223	return 0;
224}
225
226static int ths7303_s_register(struct v4l2_subdev *sd,
227			      const struct v4l2_dbg_register *reg)
228{
229	ths7303_write(sd, reg->reg, reg->val);
230	return 0;
231}
232#endif
233
234static const char * const stc_lpf_sel_txt[4] = {
235	"500-kHz Filter",
236	"2.5-MHz Filter",
237	"5-MHz Filter",
238	"5-MHz Filter",
239};
240
241static const char * const in_mux_sel_txt[2] = {
242	"Input A Select",
243	"Input B Select",
244};
245
246static const char * const lpf_freq_sel_txt[4] = {
247	"9-MHz LPF",
248	"16-MHz LPF",
249	"35-MHz LPF",
250	"Bypass LPF",
251};
252
253static const char * const in_bias_sel_dis_cont_txt[8] = {
254	"Disable Channel",
255	"Mute Function - No Output",
256	"DC Bias Select",
257	"DC Bias + 250 mV Offset Select",
258	"AC Bias Select",
259	"Sync Tip Clamp with low bias",
260	"Sync Tip Clamp with mid bias",
261	"Sync Tip Clamp with high bias",
262};
263
264static void ths7303_log_channel_status(struct v4l2_subdev *sd, u8 reg)
265{
266	u8 val = ths7303_read(sd, reg);
267
268	if ((val & 0x7) == 0) {
269		v4l2_info(sd, "Channel %d Off\n", reg);
270		return;
271	}
272
273	v4l2_info(sd, "Channel %d On\n", reg);
274	v4l2_info(sd, "  value 0x%x\n", val);
275	v4l2_info(sd, "  %s\n", stc_lpf_sel_txt[(val >> 6) & 0x3]);
276	v4l2_info(sd, "  %s\n", in_mux_sel_txt[(val >> 5) & 0x1]);
277	v4l2_info(sd, "  %s\n", lpf_freq_sel_txt[(val >> 3) & 0x3]);
278	v4l2_info(sd, "  %s\n", in_bias_sel_dis_cont_txt[(val >> 0) & 0x7]);
279}
280
281static int ths7303_log_status(struct v4l2_subdev *sd)
282{
283	struct ths7303_state *state = to_state(sd);
284
285	v4l2_info(sd, "stream %s\n", state->stream_on ? "On" : "Off");
286
287	if (state->bt.pixelclock) {
288		struct v4l2_bt_timings *bt = bt = &state->bt;
289		u32 frame_width, frame_height;
290
291		frame_width = V4L2_DV_BT_FRAME_WIDTH(bt);
292		frame_height = V4L2_DV_BT_FRAME_HEIGHT(bt);
293		v4l2_info(sd,
294			  "timings: %dx%d%s%d (%dx%d). Pix freq. = %d Hz. Polarities = 0x%x\n",
295			  bt->width, bt->height, bt->interlaced ? "i" : "p",
296			  (frame_height * frame_width) > 0 ?
297			  (int)bt->pixelclock /
298			  (frame_height * frame_width) : 0,
299			  frame_width, frame_height,
300			  (int)bt->pixelclock, bt->polarities);
301	} else {
302		v4l2_info(sd, "no timings set\n");
303	}
304
305	ths7303_log_channel_status(sd, THS7303_CHANNEL_1);
306	ths7303_log_channel_status(sd, THS7303_CHANNEL_2);
307	ths7303_log_channel_status(sd, THS7303_CHANNEL_3);
308
309	return 0;
310}
311
312static const struct v4l2_subdev_core_ops ths7303_core_ops = {
313	.log_status = ths7303_log_status,
314#ifdef CONFIG_VIDEO_ADV_DEBUG
315	.g_register = ths7303_g_register,
316	.s_register = ths7303_s_register,
317#endif
318};
319
320static const struct v4l2_subdev_ops ths7303_ops = {
321	.core	= &ths7303_core_ops,
322	.video 	= &ths7303_video_ops,
323};
324
325static int ths7303_probe(struct i2c_client *client,
326			const struct i2c_device_id *id)
327{
328	struct ths7303_platform_data *pdata = client->dev.platform_data;
329	struct ths7303_state *state;
330	struct v4l2_subdev *sd;
331
332	if (pdata == NULL) {
333		dev_err(&client->dev, "No platform data\n");
334		return -EINVAL;
335	}
336
337	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
338		return -ENODEV;
339
340	v4l_info(client, "chip found @ 0x%x (%s)\n",
341			client->addr << 1, client->adapter->name);
342
343	state = devm_kzalloc(&client->dev, sizeof(struct ths7303_state),
344			     GFP_KERNEL);
345	if (!state)
346		return -ENOMEM;
347
348	state->pdata = pdata;
349	sd = &state->sd;
350	v4l2_i2c_subdev_init(sd, client, &ths7303_ops);
351
352	/* set to default 480I_576I filter mode */
353	if (ths7303_setval(sd, THS7303_FILTER_MODE_480I_576I) < 0) {
354		v4l_err(client, "Setting to 480I_576I filter mode failed!\n");
355		return -EINVAL;
356	}
357
358	return 0;
359}
360
361static int ths7303_remove(struct i2c_client *client)
362{
363	struct v4l2_subdev *sd = i2c_get_clientdata(client);
364
365	v4l2_device_unregister_subdev(sd);
366
367	return 0;
368}
369
370static const struct i2c_device_id ths7303_id[] = {
371	{"ths7303", 0},
372	{"ths7353", 0},
373	{},
374};
375
376MODULE_DEVICE_TABLE(i2c, ths7303_id);
377
378static struct i2c_driver ths7303_driver = {
379	.driver = {
380		.owner	= THIS_MODULE,
381		.name	= "ths73x3",
382	},
383	.probe		= ths7303_probe,
384	.remove		= ths7303_remove,
385	.id_table	= ths7303_id,
386};
387
388module_i2c_driver(ths7303_driver);
389