1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * CIMaX SP2/SP2HF (Atmel T90FJR) CI driver
4  *
5  * Copyright (C) 2014 Olli Salonen <olli.salonen@iki.fi>
6  *
7  * Heavily based on CIMax2(R) SP2 driver in conjunction with NetUp Dual
8  * DVB-S2 CI card (cimax2) with following copyrights:
9  *
10  *  Copyright (C) 2009 NetUP Inc.
11  *  Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru>
12  *  Copyright (C) 2009 Abylay Ospan <aospan@netup.ru>
13  */
14 
15 #include "sp2_priv.h"
16 
17 static int sp2_read_i2c(struct sp2 *s, u8 reg, u8 *buf, int len)
18 {
19 	int ret;
20 	struct i2c_client *client = s->client;
21 	struct i2c_adapter *adap = client->adapter;
22 	struct i2c_msg msg[] = {
23 		{
24 			.addr = client->addr,
25 			.flags = 0,
26 			.buf = &reg,
27 			.len = 1
28 		}, {
29 			.addr = client->addr,
30 			.flags	= I2C_M_RD,
31 			.buf = buf,
32 			.len = len
33 		}
34 	};
35 
36 	ret = i2c_transfer(adap, msg, 2);
37 
38 	if (ret != 2) {
39 		dev_err(&client->dev, "i2c read error, reg = 0x%02x, status = %d\n",
40 				reg, ret);
41 		if (ret < 0)
42 			return ret;
43 		else
44 			return -EIO;
45 	}
46 
47 	dev_dbg(&s->client->dev, "addr=0x%04x, reg = 0x%02x, data = %02x\n",
48 				client->addr, reg, buf[0]);
49 
50 	return 0;
51 }
52 
53 static int sp2_write_i2c(struct sp2 *s, u8 reg, u8 *buf, int len)
54 {
55 	int ret;
56 	u8 buffer[35];
57 	struct i2c_client *client = s->client;
58 	struct i2c_adapter *adap = client->adapter;
59 	struct i2c_msg msg = {
60 		.addr = client->addr,
61 		.flags = 0,
62 		.buf = &buffer[0],
63 		.len = len + 1
64 	};
65 
66 	if ((len + 1) > sizeof(buffer)) {
67 		dev_err(&client->dev, "i2c wr reg=%02x: len=%d is too big!\n",
68 				reg, len);
69 		return -EINVAL;
70 	}
71 
72 	buffer[0] = reg;
73 	memcpy(&buffer[1], buf, len);
74 
75 	ret = i2c_transfer(adap, &msg, 1);
76 
77 	if (ret != 1) {
78 		dev_err(&client->dev, "i2c write error, reg = 0x%02x, status = %d\n",
79 				reg, ret);
80 		if (ret < 0)
81 			return ret;
82 		else
83 			return -EIO;
84 	}
85 
86 	dev_dbg(&s->client->dev, "addr=0x%04x, reg = 0x%02x, data = %*ph\n",
87 				client->addr, reg, len, buf);
88 
89 	return 0;
90 }
91 
92 static int sp2_ci_op_cam(struct dvb_ca_en50221 *en50221, int slot, u8 acs,
93 			u8 read, int addr, u8 data)
94 {
95 	struct sp2 *s = en50221->data;
96 	u8 store;
97 	int mem, ret;
98 	int (*ci_op_cam)(void*, u8, int, u8, int*) = s->ci_control;
99 
100 	if (slot != 0)
101 		return -EINVAL;
102 
103 	/*
104 	 * change module access type between IO space and attribute memory
105 	 * when needed
106 	 */
107 	if (s->module_access_type != acs) {
108 		ret = sp2_read_i2c(s, 0x00, &store, 1);
109 
110 		if (ret)
111 			return ret;
112 
113 		store &= ~(SP2_MOD_CTL_ACS1 | SP2_MOD_CTL_ACS0);
114 		store |= acs;
115 
116 		ret = sp2_write_i2c(s, 0x00, &store, 1);
117 		if (ret)
118 			return ret;
119 	}
120 
121 	s->module_access_type = acs;
122 
123 	/* implementation of ci_op_cam is device specific */
124 	if (ci_op_cam) {
125 		ret = ci_op_cam(s->priv, read, addr, data, &mem);
126 	} else {
127 		dev_err(&s->client->dev, "callback not defined");
128 		return -EINVAL;
129 	}
130 
131 	if (ret)
132 		return ret;
133 
134 	dev_dbg(&s->client->dev, "%s: slot=%d, addr=0x%04x, %s, data=%x",
135 			(read) ? "read" : "write", slot, addr,
136 			(acs == SP2_CI_ATTR_ACS) ? "attr" : "io",
137 			(read) ? mem : data);
138 
139 	if (read)
140 		return mem;
141 	else
142 		return 0;
143 
144 }
145 
146 int sp2_ci_read_attribute_mem(struct dvb_ca_en50221 *en50221,
147 				int slot, int addr)
148 {
149 	return sp2_ci_op_cam(en50221, slot, SP2_CI_ATTR_ACS,
150 			SP2_CI_RD, addr, 0);
151 }
152 
153 int sp2_ci_write_attribute_mem(struct dvb_ca_en50221 *en50221,
154 				int slot, int addr, u8 data)
155 {
156 	return sp2_ci_op_cam(en50221, slot, SP2_CI_ATTR_ACS,
157 			SP2_CI_WR, addr, data);
158 }
159 
160 int sp2_ci_read_cam_control(struct dvb_ca_en50221 *en50221,
161 				int slot, u8 addr)
162 {
163 	return sp2_ci_op_cam(en50221, slot, SP2_CI_IO_ACS,
164 			SP2_CI_RD, addr, 0);
165 }
166 
167 int sp2_ci_write_cam_control(struct dvb_ca_en50221 *en50221,
168 				int slot, u8 addr, u8 data)
169 {
170 	return sp2_ci_op_cam(en50221, slot, SP2_CI_IO_ACS,
171 			SP2_CI_WR, addr, data);
172 }
173 
174 int sp2_ci_slot_reset(struct dvb_ca_en50221 *en50221, int slot)
175 {
176 	struct sp2 *s = en50221->data;
177 	u8 buf;
178 	int ret;
179 
180 	dev_dbg(&s->client->dev, "slot: %d\n", slot);
181 
182 	if (slot != 0)
183 		return -EINVAL;
184 
185 	/* RST on */
186 	buf = SP2_MOD_CTL_RST;
187 	ret = sp2_write_i2c(s, 0x00, &buf, 1);
188 
189 	if (ret)
190 		return ret;
191 
192 	usleep_range(500, 600);
193 
194 	/* RST off */
195 	buf = 0x00;
196 	ret = sp2_write_i2c(s, 0x00, &buf, 1);
197 
198 	if (ret)
199 		return ret;
200 
201 	msleep(1000);
202 
203 	return 0;
204 }
205 
206 int sp2_ci_slot_shutdown(struct dvb_ca_en50221 *en50221, int slot)
207 {
208 	struct sp2 *s = en50221->data;
209 
210 	dev_dbg(&s->client->dev, "slot:%d\n", slot);
211 
212 	/* not implemented */
213 	return 0;
214 }
215 
216 int sp2_ci_slot_ts_enable(struct dvb_ca_en50221 *en50221, int slot)
217 {
218 	struct sp2 *s = en50221->data;
219 	u8 buf;
220 
221 	dev_dbg(&s->client->dev, "slot:%d\n", slot);
222 
223 	if (slot != 0)
224 		return -EINVAL;
225 
226 	sp2_read_i2c(s, 0x00, &buf, 1);
227 
228 	/* disable bypass and enable TS */
229 	buf |= (SP2_MOD_CTL_TSOEN | SP2_MOD_CTL_TSIEN);
230 	return sp2_write_i2c(s, 0, &buf, 1);
231 }
232 
233 int sp2_ci_poll_slot_status(struct dvb_ca_en50221 *en50221,
234 				int slot, int open)
235 {
236 	struct sp2 *s = en50221->data;
237 	u8 buf[2];
238 	int ret;
239 
240 	dev_dbg(&s->client->dev, "slot:%d open:%d\n", slot, open);
241 
242 	/*
243 	 * CAM module INSERT/REMOVE processing. Slow operation because of i2c
244 	 * transfers. Throttle read to one per sec.
245 	 */
246 	if (time_after(jiffies, s->next_status_checked_time)) {
247 		ret = sp2_read_i2c(s, 0x00, buf, 1);
248 		s->next_status_checked_time = jiffies +	msecs_to_jiffies(1000);
249 
250 		if (ret)
251 			return 0;
252 
253 		if (buf[0] & SP2_MOD_CTL_DET)
254 			s->status = DVB_CA_EN50221_POLL_CAM_PRESENT |
255 					DVB_CA_EN50221_POLL_CAM_READY;
256 		else
257 			s->status = 0;
258 	}
259 
260 	return s->status;
261 }
262 
263 static int sp2_init(struct sp2 *s)
264 {
265 	int ret = 0;
266 	u8 buf;
267 	u8 cimax_init[34] = {
268 		0x00, /* module A control*/
269 		0x00, /* auto select mask high A */
270 		0x00, /* auto select mask low A */
271 		0x00, /* auto select pattern high A */
272 		0x00, /* auto select pattern low A */
273 		0x44, /* memory access time A, 600 ns */
274 		0x00, /* invert input A */
275 		0x00, /* RFU */
276 		0x00, /* RFU */
277 		0x00, /* module B control*/
278 		0x00, /* auto select mask high B */
279 		0x00, /* auto select mask low B */
280 		0x00, /* auto select pattern high B */
281 		0x00, /* auto select pattern low B */
282 		0x44, /* memory access time B, 600 ns */
283 		0x00, /* invert input B */
284 		0x00, /* RFU */
285 		0x00, /* RFU */
286 		0x00, /* auto select mask high Ext */
287 		0x00, /* auto select mask low Ext */
288 		0x00, /* auto select pattern high Ext */
289 		0x00, /* auto select pattern low Ext */
290 		0x00, /* RFU */
291 		0x02, /* destination - module A */
292 		0x01, /* power control reg, VCC power on */
293 		0x00, /* RFU */
294 		0x00, /* int status read only */
295 		0x00, /* Interrupt Mask Register */
296 		0x05, /* EXTINT=active-high, INT=push-pull */
297 		0x00, /* USCG1 */
298 		0x04, /* ack active low */
299 		0x00, /* LOCK = 0 */
300 		0x22, /* unknown */
301 		0x00, /* synchronization? */
302 	};
303 
304 	dev_dbg(&s->client->dev, "\n");
305 
306 	s->ca.owner = THIS_MODULE;
307 	s->ca.read_attribute_mem = sp2_ci_read_attribute_mem;
308 	s->ca.write_attribute_mem = sp2_ci_write_attribute_mem;
309 	s->ca.read_cam_control = sp2_ci_read_cam_control;
310 	s->ca.write_cam_control = sp2_ci_write_cam_control;
311 	s->ca.slot_reset = sp2_ci_slot_reset;
312 	s->ca.slot_shutdown = sp2_ci_slot_shutdown;
313 	s->ca.slot_ts_enable = sp2_ci_slot_ts_enable;
314 	s->ca.poll_slot_status = sp2_ci_poll_slot_status;
315 	s->ca.data = s;
316 	s->module_access_type = 0;
317 
318 	/* initialize all regs */
319 	ret = sp2_write_i2c(s, 0x00, &cimax_init[0], 34);
320 	if (ret)
321 		goto err;
322 
323 	/* lock registers */
324 	buf = 1;
325 	ret = sp2_write_i2c(s, 0x1f, &buf, 1);
326 	if (ret)
327 		goto err;
328 
329 	/* power on slots */
330 	ret = sp2_write_i2c(s, 0x18, &buf, 1);
331 	if (ret)
332 		goto err;
333 
334 	ret = dvb_ca_en50221_init(s->dvb_adap, &s->ca, 0, 1);
335 	if (ret)
336 		goto err;
337 
338 	return 0;
339 
340 err:
341 	dev_dbg(&s->client->dev, "init failed=%d\n", ret);
342 	return ret;
343 }
344 
345 static int sp2_exit(struct i2c_client *client)
346 {
347 	struct sp2 *s;
348 
349 	dev_dbg(&client->dev, "\n");
350 
351 	if (!client)
352 		return 0;
353 
354 	s = i2c_get_clientdata(client);
355 	if (!s)
356 		return 0;
357 
358 	if (!s->ca.data)
359 		return 0;
360 
361 	dvb_ca_en50221_release(&s->ca);
362 
363 	return 0;
364 }
365 
366 static int sp2_probe(struct i2c_client *client,
367 		const struct i2c_device_id *id)
368 {
369 	struct sp2_config *cfg = client->dev.platform_data;
370 	struct sp2 *s;
371 	int ret;
372 
373 	dev_dbg(&client->dev, "\n");
374 
375 	s = kzalloc(sizeof(*s), GFP_KERNEL);
376 	if (!s) {
377 		ret = -ENOMEM;
378 		goto err;
379 	}
380 
381 	s->client = client;
382 	s->dvb_adap = cfg->dvb_adap;
383 	s->priv = cfg->priv;
384 	s->ci_control = cfg->ci_control;
385 
386 	i2c_set_clientdata(client, s);
387 
388 	ret = sp2_init(s);
389 	if (ret)
390 		goto err;
391 
392 	dev_info(&s->client->dev, "CIMaX SP2 successfully attached\n");
393 	return 0;
394 err:
395 	dev_dbg(&client->dev, "init failed=%d\n", ret);
396 	kfree(s);
397 
398 	return ret;
399 }
400 
401 static int sp2_remove(struct i2c_client *client)
402 {
403 	struct sp2 *s = i2c_get_clientdata(client);
404 
405 	dev_dbg(&client->dev, "\n");
406 	sp2_exit(client);
407 	kfree(s);
408 	return 0;
409 }
410 
411 static const struct i2c_device_id sp2_id[] = {
412 	{"sp2", 0},
413 	{}
414 };
415 MODULE_DEVICE_TABLE(i2c, sp2_id);
416 
417 static struct i2c_driver sp2_driver = {
418 	.driver = {
419 		.name	= "sp2",
420 	},
421 	.probe		= sp2_probe,
422 	.remove		= sp2_remove,
423 	.id_table	= sp2_id,
424 };
425 
426 module_i2c_driver(sp2_driver);
427 
428 MODULE_DESCRIPTION("CIMaX SP2/HF CI driver");
429 MODULE_AUTHOR("Olli Salonen <olli.salonen@iki.fi>");
430 MODULE_LICENSE("GPL");
431