1 /**************************************************************************
2 
3 Copyright © 2006 Dave Airlie
4 
5 All Rights Reserved.
6 
7 Permission is hereby granted, free of charge, to any person obtaining a
8 copy of this software and associated documentation files (the
9 "Software"), to deal in the Software without restriction, including
10 without limitation the rights to use, copy, modify, merge, publish,
11 distribute, sub license, and/or sell copies of the Software, and to
12 permit persons to whom the Software is furnished to do so, subject to
13 the following conditions:
14 
15 The above copyright notice and this permission notice (including the
16 next paragraph) shall be included in all copies or substantial portions
17 of the Software.
18 
19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
23 ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 
27 **************************************************************************/
28 
29 #include "intel_display_types.h"
30 #include "intel_dvo_dev.h"
31 
32 #define SIL164_VID 0x0001
33 #define SIL164_DID 0x0006
34 
35 #define SIL164_VID_LO 0x00
36 #define SIL164_VID_HI 0x01
37 #define SIL164_DID_LO 0x02
38 #define SIL164_DID_HI 0x03
39 #define SIL164_REV    0x04
40 #define SIL164_RSVD   0x05
41 #define SIL164_FREQ_LO 0x06
42 #define SIL164_FREQ_HI 0x07
43 
44 #define SIL164_REG8 0x08
45 #define SIL164_8_VEN (1<<5)
46 #define SIL164_8_HEN (1<<4)
47 #define SIL164_8_DSEL (1<<3)
48 #define SIL164_8_BSEL (1<<2)
49 #define SIL164_8_EDGE (1<<1)
50 #define SIL164_8_PD   (1<<0)
51 
52 #define SIL164_REG9 0x09
53 #define SIL164_9_VLOW (1<<7)
54 #define SIL164_9_MSEL_MASK (0x7<<4)
55 #define SIL164_9_TSEL (1<<3)
56 #define SIL164_9_RSEN (1<<2)
57 #define SIL164_9_HTPLG (1<<1)
58 #define SIL164_9_MDI (1<<0)
59 
60 #define SIL164_REGC 0x0c
61 
62 struct sil164_priv {
63 	//I2CDevRec d;
64 	bool quiet;
65 };
66 
67 #define SILPTR(d) ((SIL164Ptr)(d->DriverPrivate.ptr))
68 
69 static bool sil164_readb(struct intel_dvo_device *dvo, int addr, u8 *ch)
70 {
71 	struct sil164_priv *sil = dvo->dev_priv;
72 	struct i2c_adapter *adapter = dvo->i2c_bus;
73 	u8 out_buf[2];
74 	u8 in_buf[2];
75 
76 	struct i2c_msg msgs[] = {
77 		{
78 			.addr = dvo->slave_addr,
79 			.flags = 0,
80 			.len = 1,
81 			.buf = out_buf,
82 		},
83 		{
84 			.addr = dvo->slave_addr,
85 			.flags = I2C_M_RD,
86 			.len = 1,
87 			.buf = in_buf,
88 		}
89 	};
90 
91 	out_buf[0] = addr;
92 	out_buf[1] = 0;
93 
94 	if (i2c_transfer(adapter, msgs, 2) == 2) {
95 		*ch = in_buf[0];
96 		return true;
97 	}
98 
99 	if (!sil->quiet) {
100 		DRM_DEBUG_KMS("Unable to read register 0x%02x from %s:%02x.\n",
101 			  addr, adapter->name, dvo->slave_addr);
102 	}
103 	return false;
104 }
105 
106 static bool sil164_writeb(struct intel_dvo_device *dvo, int addr, u8 ch)
107 {
108 	struct sil164_priv *sil = dvo->dev_priv;
109 	struct i2c_adapter *adapter = dvo->i2c_bus;
110 	u8 out_buf[2];
111 	struct i2c_msg msg = {
112 		.addr = dvo->slave_addr,
113 		.flags = 0,
114 		.len = 2,
115 		.buf = out_buf,
116 	};
117 
118 	out_buf[0] = addr;
119 	out_buf[1] = ch;
120 
121 	if (i2c_transfer(adapter, &msg, 1) == 1)
122 		return true;
123 
124 	if (!sil->quiet) {
125 		DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d.\n",
126 			  addr, adapter->name, dvo->slave_addr);
127 	}
128 
129 	return false;
130 }
131 
132 /* Silicon Image 164 driver for chip on i2c bus */
133 static bool sil164_init(struct intel_dvo_device *dvo,
134 			struct i2c_adapter *adapter)
135 {
136 	/* this will detect the SIL164 chip on the specified i2c bus */
137 	struct sil164_priv *sil;
138 	unsigned char ch;
139 
140 	sil = kzalloc(sizeof(struct sil164_priv), GFP_KERNEL);
141 	if (sil == NULL)
142 		return false;
143 
144 	dvo->i2c_bus = adapter;
145 	dvo->dev_priv = sil;
146 	sil->quiet = true;
147 
148 	if (!sil164_readb(dvo, SIL164_VID_LO, &ch))
149 		goto out;
150 
151 	if (ch != (SIL164_VID & 0xff)) {
152 		DRM_DEBUG_KMS("sil164 not detected got %d: from %s Slave %d.\n",
153 			  ch, adapter->name, dvo->slave_addr);
154 		goto out;
155 	}
156 
157 	if (!sil164_readb(dvo, SIL164_DID_LO, &ch))
158 		goto out;
159 
160 	if (ch != (SIL164_DID & 0xff)) {
161 		DRM_DEBUG_KMS("sil164 not detected got %d: from %s Slave %d.\n",
162 			  ch, adapter->name, dvo->slave_addr);
163 		goto out;
164 	}
165 	sil->quiet = false;
166 
167 	DRM_DEBUG_KMS("init sil164 dvo controller successfully!\n");
168 	return true;
169 
170 out:
171 	kfree(sil);
172 	return false;
173 }
174 
175 static enum drm_connector_status sil164_detect(struct intel_dvo_device *dvo)
176 {
177 	u8 reg9;
178 
179 	sil164_readb(dvo, SIL164_REG9, &reg9);
180 
181 	if (reg9 & SIL164_9_HTPLG)
182 		return connector_status_connected;
183 	else
184 		return connector_status_disconnected;
185 }
186 
187 static enum drm_mode_status sil164_mode_valid(struct intel_dvo_device *dvo,
188 					      struct drm_display_mode *mode)
189 {
190 	return MODE_OK;
191 }
192 
193 static void sil164_mode_set(struct intel_dvo_device *dvo,
194 			    const struct drm_display_mode *mode,
195 			    const struct drm_display_mode *adjusted_mode)
196 {
197 	/* As long as the basics are set up, since we don't have clock
198 	 * dependencies in the mode setup, we can just leave the
199 	 * registers alone and everything will work fine.
200 	 */
201 	/* recommended programming sequence from doc */
202 	/*sil164_writeb(sil, 0x08, 0x30);
203 	  sil164_writeb(sil, 0x09, 0x00);
204 	  sil164_writeb(sil, 0x0a, 0x90);
205 	  sil164_writeb(sil, 0x0c, 0x89);
206 	  sil164_writeb(sil, 0x08, 0x31);*/
207 	/* don't do much */
208 	return;
209 }
210 
211 /* set the SIL164 power state */
212 static void sil164_dpms(struct intel_dvo_device *dvo, bool enable)
213 {
214 	int ret;
215 	unsigned char ch;
216 
217 	ret = sil164_readb(dvo, SIL164_REG8, &ch);
218 	if (ret == false)
219 		return;
220 
221 	if (enable)
222 		ch |= SIL164_8_PD;
223 	else
224 		ch &= ~SIL164_8_PD;
225 
226 	sil164_writeb(dvo, SIL164_REG8, ch);
227 	return;
228 }
229 
230 static bool sil164_get_hw_state(struct intel_dvo_device *dvo)
231 {
232 	int ret;
233 	unsigned char ch;
234 
235 	ret = sil164_readb(dvo, SIL164_REG8, &ch);
236 	if (ret == false)
237 		return false;
238 
239 	if (ch & SIL164_8_PD)
240 		return true;
241 	else
242 		return false;
243 }
244 
245 static void sil164_dump_regs(struct intel_dvo_device *dvo)
246 {
247 	u8 val;
248 
249 	sil164_readb(dvo, SIL164_FREQ_LO, &val);
250 	DRM_DEBUG_KMS("SIL164_FREQ_LO: 0x%02x\n", val);
251 	sil164_readb(dvo, SIL164_FREQ_HI, &val);
252 	DRM_DEBUG_KMS("SIL164_FREQ_HI: 0x%02x\n", val);
253 	sil164_readb(dvo, SIL164_REG8, &val);
254 	DRM_DEBUG_KMS("SIL164_REG8: 0x%02x\n", val);
255 	sil164_readb(dvo, SIL164_REG9, &val);
256 	DRM_DEBUG_KMS("SIL164_REG9: 0x%02x\n", val);
257 	sil164_readb(dvo, SIL164_REGC, &val);
258 	DRM_DEBUG_KMS("SIL164_REGC: 0x%02x\n", val);
259 }
260 
261 static void sil164_destroy(struct intel_dvo_device *dvo)
262 {
263 	struct sil164_priv *sil = dvo->dev_priv;
264 
265 	if (sil) {
266 		kfree(sil);
267 		dvo->dev_priv = NULL;
268 	}
269 }
270 
271 const struct intel_dvo_dev_ops sil164_ops = {
272 	.init = sil164_init,
273 	.detect = sil164_detect,
274 	.mode_valid = sil164_mode_valid,
275 	.mode_set = sil164_mode_set,
276 	.dpms = sil164_dpms,
277 	.get_hw_state = sil164_get_hw_state,
278 	.dump_regs = sil164_dump_regs,
279 	.destroy = sil164_destroy,
280 };
281