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56e1df49 TS |
1 | /* |
2 | * Samsung MHL interface driver | |
3 | * | |
4 | * Copyright (C) 2011 Samsung Electronics Co.Ltd | |
5 | * Author: Tomasz Stanislawski <t.stanislaws@samsung.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2 of the License, or (at your | |
10 | * option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/delay.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/freezer.h> | |
16 | #include <linux/gpio.h> | |
17 | #include <linux/i2c.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/irq.h> | |
20 | #include <linux/kthread.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/pm_runtime.h> | |
23 | #include <linux/regulator/machine.h> | |
24 | #include <linux/slab.h> | |
25 | ||
eb4b0ec7 | 26 | #include <linux/platform_data/media/sii9234.h> |
56e1df49 TS |
27 | #include <media/v4l2-subdev.h> |
28 | ||
29 | MODULE_AUTHOR("Tomasz Stanislawski <t.stanislaws@samsung.com>"); | |
30 | MODULE_DESCRIPTION("Samsung MHL interface driver"); | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
33 | struct sii9234_context { | |
34 | struct i2c_client *client; | |
35 | struct regulator *power; | |
36 | int gpio_n_reset; | |
37 | struct v4l2_subdev sd; | |
38 | }; | |
39 | ||
40 | static inline struct sii9234_context *sd_to_context(struct v4l2_subdev *sd) | |
41 | { | |
42 | return container_of(sd, struct sii9234_context, sd); | |
43 | } | |
44 | ||
45 | static inline int sii9234_readb(struct i2c_client *client, int addr) | |
46 | { | |
47 | return i2c_smbus_read_byte_data(client, addr); | |
48 | } | |
49 | ||
50 | static inline int sii9234_writeb(struct i2c_client *client, int addr, int value) | |
51 | { | |
52 | return i2c_smbus_write_byte_data(client, addr, value); | |
53 | } | |
54 | ||
55 | static inline int sii9234_writeb_mask(struct i2c_client *client, int addr, | |
56 | int value, int mask) | |
57 | { | |
58 | int ret; | |
59 | ||
60 | ret = i2c_smbus_read_byte_data(client, addr); | |
61 | if (ret < 0) | |
62 | return ret; | |
63 | ret = (ret & ~mask) | (value & mask); | |
64 | return i2c_smbus_write_byte_data(client, addr, ret); | |
65 | } | |
66 | ||
67 | static inline int sii9234_readb_idx(struct i2c_client *client, int addr) | |
68 | { | |
69 | int ret; | |
70 | ret = i2c_smbus_write_byte_data(client, 0xbc, addr >> 8); | |
71 | if (ret < 0) | |
72 | return ret; | |
73 | ret = i2c_smbus_write_byte_data(client, 0xbd, addr & 0xff); | |
74 | if (ret < 0) | |
75 | return ret; | |
76 | return i2c_smbus_read_byte_data(client, 0xbe); | |
77 | } | |
78 | ||
79 | static inline int sii9234_writeb_idx(struct i2c_client *client, int addr, | |
80 | int value) | |
81 | { | |
82 | int ret; | |
83 | ret = i2c_smbus_write_byte_data(client, 0xbc, addr >> 8); | |
84 | if (ret < 0) | |
85 | return ret; | |
86 | ret = i2c_smbus_write_byte_data(client, 0xbd, addr & 0xff); | |
87 | if (ret < 0) | |
88 | return ret; | |
89 | ret = i2c_smbus_write_byte_data(client, 0xbe, value); | |
90 | return ret; | |
91 | } | |
92 | ||
93 | static inline int sii9234_writeb_idx_mask(struct i2c_client *client, int addr, | |
94 | int value, int mask) | |
95 | { | |
96 | int ret; | |
97 | ||
98 | ret = sii9234_readb_idx(client, addr); | |
99 | if (ret < 0) | |
100 | return ret; | |
101 | ret = (ret & ~mask) | (value & mask); | |
102 | return sii9234_writeb_idx(client, addr, ret); | |
103 | } | |
104 | ||
105 | static int sii9234_reset(struct sii9234_context *ctx) | |
106 | { | |
107 | struct i2c_client *client = ctx->client; | |
108 | struct device *dev = &client->dev; | |
109 | int ret, tries; | |
110 | ||
111 | gpio_direction_output(ctx->gpio_n_reset, 1); | |
112 | mdelay(1); | |
113 | gpio_direction_output(ctx->gpio_n_reset, 0); | |
114 | mdelay(1); | |
115 | gpio_direction_output(ctx->gpio_n_reset, 1); | |
116 | mdelay(1); | |
117 | ||
118 | /* going to TTPI mode */ | |
119 | ret = sii9234_writeb(client, 0xc7, 0); | |
120 | if (ret < 0) { | |
121 | dev_err(dev, "failed to set TTPI mode\n"); | |
122 | return ret; | |
123 | } | |
124 | for (tries = 0; tries < 100 ; ++tries) { | |
125 | ret = sii9234_readb(client, 0x1b); | |
126 | if (ret > 0) | |
127 | break; | |
128 | if (ret < 0) { | |
129 | dev_err(dev, "failed to reset device\n"); | |
130 | return -EIO; | |
131 | } | |
132 | mdelay(1); | |
133 | } | |
134 | if (tries == 100) { | |
135 | dev_err(dev, "maximal number of tries reached\n"); | |
136 | return -EIO; | |
137 | } | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static int sii9234_verify_version(struct i2c_client *client) | |
143 | { | |
144 | struct device *dev = &client->dev; | |
145 | int family, rev, tpi_rev, dev_id, sub_id, hdcp, id; | |
146 | ||
147 | family = sii9234_readb(client, 0x1b); | |
148 | rev = sii9234_readb(client, 0x1c) & 0x0f; | |
149 | tpi_rev = sii9234_readb(client, 0x1d) & 0x7f; | |
150 | dev_id = sii9234_readb_idx(client, 0x0103); | |
151 | sub_id = sii9234_readb_idx(client, 0x0102); | |
152 | hdcp = sii9234_readb(client, 0x30); | |
153 | ||
154 | if (family < 0 || rev < 0 || tpi_rev < 0 || dev_id < 0 || | |
155 | sub_id < 0 || hdcp < 0) { | |
156 | dev_err(dev, "failed to read chip's version\n"); | |
157 | return -EIO; | |
158 | } | |
159 | ||
160 | id = (dev_id << 8) | sub_id; | |
161 | ||
162 | dev_info(dev, "chip: SiL%02x family: %02x, rev: %02x\n", | |
163 | id, family, rev); | |
164 | dev_info(dev, "tpi_rev:%02x, hdcp: %02x\n", tpi_rev, hdcp); | |
165 | if (id != 0x9234) { | |
166 | dev_err(dev, "not supported chip\n"); | |
167 | return -ENODEV; | |
168 | } | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static u8 data[][3] = { | |
174 | /* setup from driver created by doonsoo45.kim */ | |
175 | { 0x01, 0x05, 0x04 }, /* Enable Auto soft reset on SCDT = 0 */ | |
176 | { 0x01, 0x08, 0x35 }, /* Power Up TMDS Tx Core */ | |
177 | { 0x01, 0x0d, 0x1c }, /* HDMI Transcode mode enable */ | |
178 | { 0x01, 0x2b, 0x01 }, /* Enable HDCP Compliance workaround */ | |
179 | { 0x01, 0x79, 0x40 }, /* daniel test...MHL_INT */ | |
180 | { 0x01, 0x80, 0x34 }, /* Enable Rx PLL Clock Value */ | |
181 | { 0x01, 0x90, 0x27 }, /* Enable CBUS discovery */ | |
182 | { 0x01, 0x91, 0xe5 }, /* Skip RGND detection */ | |
183 | { 0x01, 0x92, 0x46 }, /* Force MHD mode */ | |
184 | { 0x01, 0x93, 0xdc }, /* Disable CBUS pull-up during RGND measurement */ | |
185 | { 0x01, 0x94, 0x66 }, /* 1.8V CBUS VTH & GND threshold */ | |
186 | { 0x01, 0x95, 0x31 }, /* RGND block & single discovery attempt */ | |
187 | { 0x01, 0x96, 0x22 }, /* use 1K and 2K setting */ | |
188 | { 0x01, 0xa0, 0x10 }, /* SIMG: Term mode */ | |
189 | { 0x01, 0xa1, 0xfc }, /* Disable internal Mobile HD driver */ | |
190 | { 0x01, 0xa3, 0xfa }, /* SIMG: Output Swing default EB, 3x Clk Mult */ | |
191 | { 0x01, 0xa5, 0x80 }, /* SIMG: RGND Hysterisis, 3x mode for Beast */ | |
192 | { 0x01, 0xa6, 0x0c }, /* SIMG: Swing Offset */ | |
193 | { 0x02, 0x3d, 0x3f }, /* Power up CVCC 1.2V core */ | |
194 | { 0x03, 0x00, 0x00 }, /* SIMG: correcting HW default */ | |
195 | { 0x03, 0x11, 0x01 }, /* Enable TxPLL Clock */ | |
196 | { 0x03, 0x12, 0x15 }, /* Enable Tx Clock Path & Equalizer */ | |
197 | { 0x03, 0x13, 0x60 }, /* SIMG: Set termination value */ | |
198 | { 0x03, 0x14, 0xf0 }, /* SIMG: Change CKDT level */ | |
199 | { 0x03, 0x17, 0x07 }, /* SIMG: PLL Calrefsel */ | |
200 | { 0x03, 0x1a, 0x20 }, /* VCO Cal */ | |
201 | { 0x03, 0x22, 0xe0 }, /* SIMG: Auto EQ */ | |
202 | { 0x03, 0x23, 0xc0 }, /* SIMG: Auto EQ */ | |
203 | { 0x03, 0x24, 0xa0 }, /* SIMG: Auto EQ */ | |
204 | { 0x03, 0x25, 0x80 }, /* SIMG: Auto EQ */ | |
205 | { 0x03, 0x26, 0x60 }, /* SIMG: Auto EQ */ | |
206 | { 0x03, 0x27, 0x40 }, /* SIMG: Auto EQ */ | |
207 | { 0x03, 0x28, 0x20 }, /* SIMG: Auto EQ */ | |
208 | { 0x03, 0x29, 0x00 }, /* SIMG: Auto EQ */ | |
209 | { 0x03, 0x31, 0x0b }, /* SIMG: Rx PLL BW value from I2C BW ~ 4MHz */ | |
210 | { 0x03, 0x45, 0x06 }, /* SIMG: DPLL Mode */ | |
211 | { 0x03, 0x4b, 0x06 }, /* SIMG: Correcting HW default */ | |
212 | { 0x03, 0x4c, 0xa0 }, /* Manual zone control */ | |
213 | { 0x03, 0x4d, 0x02 }, /* SIMG: PLL Mode Value (order is important) */ | |
214 | }; | |
215 | ||
216 | static int sii9234_set_internal(struct sii9234_context *ctx) | |
217 | { | |
218 | struct i2c_client *client = ctx->client; | |
219 | int i, ret; | |
220 | ||
221 | for (i = 0; i < ARRAY_SIZE(data); ++i) { | |
222 | int addr = (data[i][0] << 8) | data[i][1]; | |
223 | ret = sii9234_writeb_idx(client, addr, data[i][2]); | |
224 | if (ret < 0) | |
225 | return ret; | |
226 | } | |
227 | return 0; | |
228 | } | |
229 | ||
230 | static int sii9234_runtime_suspend(struct device *dev) | |
231 | { | |
232 | struct v4l2_subdev *sd = dev_get_drvdata(dev); | |
233 | struct sii9234_context *ctx = sd_to_context(sd); | |
234 | struct i2c_client *client = ctx->client; | |
235 | ||
236 | dev_info(dev, "suspend start\n"); | |
237 | ||
238 | sii9234_writeb_mask(client, 0x1e, 3, 3); | |
239 | regulator_disable(ctx->power); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static int sii9234_runtime_resume(struct device *dev) | |
245 | { | |
246 | struct v4l2_subdev *sd = dev_get_drvdata(dev); | |
247 | struct sii9234_context *ctx = sd_to_context(sd); | |
248 | struct i2c_client *client = ctx->client; | |
249 | int ret; | |
250 | ||
251 | dev_info(dev, "resume start\n"); | |
984b248f SN |
252 | ret = regulator_enable(ctx->power); |
253 | if (ret < 0) | |
254 | return ret; | |
56e1df49 TS |
255 | |
256 | ret = sii9234_reset(ctx); | |
257 | if (ret) | |
258 | goto fail; | |
259 | ||
260 | /* enable tpi */ | |
261 | ret = sii9234_writeb_mask(client, 0x1e, 1, 0); | |
262 | if (ret < 0) | |
263 | goto fail; | |
264 | ret = sii9234_set_internal(ctx); | |
265 | if (ret < 0) | |
266 | goto fail; | |
267 | ||
268 | return 0; | |
269 | ||
270 | fail: | |
271 | dev_err(dev, "failed to resume\n"); | |
272 | regulator_disable(ctx->power); | |
273 | ||
274 | return ret; | |
275 | } | |
276 | ||
277 | static const struct dev_pm_ops sii9234_pm_ops = { | |
278 | .runtime_suspend = sii9234_runtime_suspend, | |
279 | .runtime_resume = sii9234_runtime_resume, | |
280 | }; | |
281 | ||
282 | static int sii9234_s_power(struct v4l2_subdev *sd, int on) | |
283 | { | |
284 | struct sii9234_context *ctx = sd_to_context(sd); | |
285 | int ret; | |
286 | ||
287 | if (on) | |
288 | ret = pm_runtime_get_sync(&ctx->client->dev); | |
289 | else | |
290 | ret = pm_runtime_put(&ctx->client->dev); | |
291 | /* only values < 0 indicate errors */ | |
d8e8b40c | 292 | return ret < 0 ? ret : 0; |
56e1df49 TS |
293 | } |
294 | ||
295 | static int sii9234_s_stream(struct v4l2_subdev *sd, int enable) | |
296 | { | |
297 | struct sii9234_context *ctx = sd_to_context(sd); | |
298 | ||
299 | /* (dis/en)able TDMS output */ | |
300 | sii9234_writeb_mask(ctx->client, 0x1a, enable ? 0 : ~0 , 1 << 4); | |
301 | return 0; | |
302 | } | |
303 | ||
304 | static const struct v4l2_subdev_core_ops sii9234_core_ops = { | |
305 | .s_power = sii9234_s_power, | |
306 | }; | |
307 | ||
308 | static const struct v4l2_subdev_video_ops sii9234_video_ops = { | |
309 | .s_stream = sii9234_s_stream, | |
310 | }; | |
311 | ||
312 | static const struct v4l2_subdev_ops sii9234_ops = { | |
313 | .core = &sii9234_core_ops, | |
314 | .video = &sii9234_video_ops, | |
315 | }; | |
316 | ||
4c62e976 GKH |
317 | static int sii9234_probe(struct i2c_client *client, |
318 | const struct i2c_device_id *id) | |
56e1df49 TS |
319 | { |
320 | struct device *dev = &client->dev; | |
321 | struct sii9234_platform_data *pdata = dev->platform_data; | |
322 | struct sii9234_context *ctx; | |
323 | int ret; | |
324 | ||
89e47e35 | 325 | ctx = devm_kzalloc(&client->dev, sizeof(*ctx), GFP_KERNEL); |
56e1df49 TS |
326 | if (!ctx) { |
327 | dev_err(dev, "out of memory\n"); | |
328 | ret = -ENOMEM; | |
329 | goto fail; | |
330 | } | |
331 | ctx->client = client; | |
332 | ||
89e47e35 | 333 | ctx->power = devm_regulator_get(dev, "hdmi-en"); |
56e1df49 TS |
334 | if (IS_ERR(ctx->power)) { |
335 | dev_err(dev, "failed to acquire regulator hdmi-en\n"); | |
89e47e35 | 336 | return PTR_ERR(ctx->power); |
56e1df49 TS |
337 | } |
338 | ||
339 | ctx->gpio_n_reset = pdata->gpio_n_reset; | |
899a179d | 340 | ret = devm_gpio_request(dev, ctx->gpio_n_reset, "MHL_RST"); |
56e1df49 TS |
341 | if (ret) { |
342 | dev_err(dev, "failed to acquire MHL_RST gpio\n"); | |
89e47e35 | 343 | return ret; |
56e1df49 TS |
344 | } |
345 | ||
346 | v4l2_i2c_subdev_init(&ctx->sd, client, &sii9234_ops); | |
347 | ||
348 | pm_runtime_enable(dev); | |
349 | ||
350 | /* enable device */ | |
351 | ret = pm_runtime_get_sync(dev); | |
352 | if (ret) | |
353 | goto fail_pm; | |
354 | ||
355 | /* verify chip version */ | |
356 | ret = sii9234_verify_version(client); | |
357 | if (ret) | |
358 | goto fail_pm_get; | |
359 | ||
360 | /* stop processing */ | |
361 | pm_runtime_put(dev); | |
362 | ||
363 | dev_info(dev, "probe successful\n"); | |
364 | ||
365 | return 0; | |
366 | ||
367 | fail_pm_get: | |
368 | pm_runtime_put_sync(dev); | |
369 | ||
370 | fail_pm: | |
371 | pm_runtime_disable(dev); | |
56e1df49 | 372 | |
56e1df49 TS |
373 | fail: |
374 | dev_err(dev, "probe failed\n"); | |
375 | ||
376 | return ret; | |
377 | } | |
378 | ||
4c62e976 | 379 | static int sii9234_remove(struct i2c_client *client) |
56e1df49 TS |
380 | { |
381 | struct device *dev = &client->dev; | |
56e1df49 TS |
382 | |
383 | pm_runtime_disable(dev); | |
56e1df49 TS |
384 | |
385 | dev_info(dev, "remove successful\n"); | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | ||
391 | static const struct i2c_device_id sii9234_id[] = { | |
392 | { "SII9234", 0 }, | |
393 | { }, | |
394 | }; | |
395 | ||
396 | MODULE_DEVICE_TABLE(i2c, sii9234_id); | |
397 | static struct i2c_driver sii9234_driver = { | |
398 | .driver = { | |
399 | .name = "sii9234", | |
56e1df49 TS |
400 | .pm = &sii9234_pm_ops, |
401 | }, | |
402 | .probe = sii9234_probe, | |
4c62e976 | 403 | .remove = sii9234_remove, |
56e1df49 TS |
404 | .id_table = sii9234_id, |
405 | }; | |
406 | ||
02a890d6 | 407 | module_i2c_driver(sii9234_driver); |