Merge branch 'x86/uv' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux...
[linux-2.6] / drivers / gpu / drm / i915 / dvo_tfp410.c
1 /*
2  * Copyright © 2007 Dave Mueller
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21  * IN THE SOFTWARE.
22  *
23  * Authors:
24  *    Dave Mueller <dave.mueller@gmx.ch>
25  *
26  */
27
28 #include "dvo.h"
29
30 /* register definitions according to the TFP410 data sheet */
31 #define TFP410_VID              0x014C
32 #define TFP410_DID              0x0410
33
34 #define TFP410_VID_LO           0x00
35 #define TFP410_VID_HI           0x01
36 #define TFP410_DID_LO           0x02
37 #define TFP410_DID_HI           0x03
38 #define TFP410_REV              0x04
39
40 #define TFP410_CTL_1            0x08
41 #define TFP410_CTL_1_TDIS       (1<<6)
42 #define TFP410_CTL_1_VEN        (1<<5)
43 #define TFP410_CTL_1_HEN        (1<<4)
44 #define TFP410_CTL_1_DSEL       (1<<3)
45 #define TFP410_CTL_1_BSEL       (1<<2)
46 #define TFP410_CTL_1_EDGE       (1<<1)
47 #define TFP410_CTL_1_PD         (1<<0)
48
49 #define TFP410_CTL_2            0x09
50 #define TFP410_CTL_2_VLOW       (1<<7)
51 #define TFP410_CTL_2_MSEL_MASK  (0x7<<4)
52 #define TFP410_CTL_2_MSEL       (1<<4)
53 #define TFP410_CTL_2_TSEL       (1<<3)
54 #define TFP410_CTL_2_RSEN       (1<<2)
55 #define TFP410_CTL_2_HTPLG      (1<<1)
56 #define TFP410_CTL_2_MDI        (1<<0)
57
58 #define TFP410_CTL_3            0x0A
59 #define TFP410_CTL_3_DK_MASK    (0x7<<5)
60 #define TFP410_CTL_3_DK         (1<<5)
61 #define TFP410_CTL_3_DKEN       (1<<4)
62 #define TFP410_CTL_3_CTL_MASK   (0x7<<1)
63 #define TFP410_CTL_3_CTL        (1<<1)
64
65 #define TFP410_USERCFG          0x0B
66
67 #define TFP410_DE_DLY           0x32
68
69 #define TFP410_DE_CTL           0x33
70 #define TFP410_DE_CTL_DEGEN     (1<<6)
71 #define TFP410_DE_CTL_VSPOL     (1<<5)
72 #define TFP410_DE_CTL_HSPOL     (1<<4)
73 #define TFP410_DE_CTL_DEDLY8    (1<<0)
74
75 #define TFP410_DE_TOP           0x34
76
77 #define TFP410_DE_CNT_LO        0x36
78 #define TFP410_DE_CNT_HI        0x37
79
80 #define TFP410_DE_LIN_LO        0x38
81 #define TFP410_DE_LIN_HI        0x39
82
83 #define TFP410_H_RES_LO         0x3A
84 #define TFP410_H_RES_HI         0x3B
85
86 #define TFP410_V_RES_LO         0x3C
87 #define TFP410_V_RES_HI         0x3D
88
89 struct tfp410_save_rec {
90         uint8_t ctl1;
91         uint8_t ctl2;
92 };
93
94 struct tfp410_priv {
95         bool quiet;
96
97         struct tfp410_save_rec saved_reg;
98         struct tfp410_save_rec mode_reg;
99 };
100
101 static bool tfp410_readb(struct intel_dvo_device *dvo, int addr, uint8_t *ch)
102 {
103         struct tfp410_priv *tfp = dvo->dev_priv;
104         struct intel_i2c_chan *i2cbus = dvo->i2c_bus;
105         u8 out_buf[2];
106         u8 in_buf[2];
107
108         struct i2c_msg msgs[] = {
109                 {
110                         .addr = i2cbus->slave_addr,
111                         .flags = 0,
112                         .len = 1,
113                         .buf = out_buf,
114                 },
115                 {
116                         .addr = i2cbus->slave_addr,
117                         .flags = I2C_M_RD,
118                         .len = 1,
119                         .buf = in_buf,
120                 }
121         };
122
123         out_buf[0] = addr;
124         out_buf[1] = 0;
125
126         if (i2c_transfer(&i2cbus->adapter, msgs, 2) == 2) {
127                 *ch = in_buf[0];
128                 return true;
129         };
130
131         if (!tfp->quiet) {
132                 DRM_DEBUG("Unable to read register 0x%02x from %s:%02x.\n",
133                           addr, i2cbus->adapter.name, i2cbus->slave_addr);
134         }
135         return false;
136 }
137
138 static bool tfp410_writeb(struct intel_dvo_device *dvo, int addr, uint8_t ch)
139 {
140         struct tfp410_priv *tfp = dvo->dev_priv;
141         struct intel_i2c_chan *i2cbus = dvo->i2c_bus;
142         uint8_t out_buf[2];
143         struct i2c_msg msg = {
144                 .addr = i2cbus->slave_addr,
145                 .flags = 0,
146                 .len = 2,
147                 .buf = out_buf,
148         };
149
150         out_buf[0] = addr;
151         out_buf[1] = ch;
152
153         if (i2c_transfer(&i2cbus->adapter, &msg, 1) == 1)
154                 return true;
155
156         if (!tfp->quiet) {
157                 DRM_DEBUG("Unable to write register 0x%02x to %s:%d.\n",
158                           addr, i2cbus->adapter.name, i2cbus->slave_addr);
159         }
160
161         return false;
162 }
163
164 static int tfp410_getid(struct intel_dvo_device *dvo, int addr)
165 {
166         uint8_t ch1, ch2;
167
168         if (tfp410_readb(dvo, addr+0, &ch1) &&
169             tfp410_readb(dvo, addr+1, &ch2))
170                 return ((ch2 << 8) & 0xFF00) | (ch1 & 0x00FF);
171
172         return -1;
173 }
174
175 /* Ti TFP410 driver for chip on i2c bus */
176 static bool tfp410_init(struct intel_dvo_device *dvo,
177                         struct intel_i2c_chan *i2cbus)
178 {
179         /* this will detect the tfp410 chip on the specified i2c bus */
180         struct tfp410_priv *tfp;
181         int id;
182
183         tfp = kzalloc(sizeof(struct tfp410_priv), GFP_KERNEL);
184         if (tfp == NULL)
185                 return false;
186
187         dvo->i2c_bus = i2cbus;
188         dvo->i2c_bus->slave_addr = dvo->slave_addr;
189         dvo->dev_priv = tfp;
190         tfp->quiet = true;
191
192         if ((id = tfp410_getid(dvo, TFP410_VID_LO)) != TFP410_VID) {
193                 DRM_DEBUG("tfp410 not detected got VID %X: from %s Slave %d.\n",
194                           id, i2cbus->adapter.name, i2cbus->slave_addr);
195                 goto out;
196         }
197
198         if ((id = tfp410_getid(dvo, TFP410_DID_LO)) != TFP410_DID) {
199                 DRM_DEBUG("tfp410 not detected got DID %X: from %s Slave %d.\n",
200                           id, i2cbus->adapter.name, i2cbus->slave_addr);
201                 goto out;
202         }
203         tfp->quiet = false;
204         return true;
205 out:
206         kfree(tfp);
207         return false;
208 }
209
210 static enum drm_connector_status tfp410_detect(struct intel_dvo_device *dvo)
211 {
212         enum drm_connector_status ret = connector_status_disconnected;
213         uint8_t ctl2;
214
215         if (tfp410_readb(dvo, TFP410_CTL_2, &ctl2)) {
216                 if (ctl2 & TFP410_CTL_2_HTPLG)
217                         ret = connector_status_connected;
218                 else
219                         ret = connector_status_disconnected;
220         }
221
222         return ret;
223 }
224
225 static enum drm_mode_status tfp410_mode_valid(struct intel_dvo_device *dvo,
226                                               struct drm_display_mode *mode)
227 {
228         return MODE_OK;
229 }
230
231 static void tfp410_mode_set(struct intel_dvo_device *dvo,
232                             struct drm_display_mode *mode,
233                             struct drm_display_mode *adjusted_mode)
234 {
235     /* As long as the basics are set up, since we don't have clock dependencies
236      * in the mode setup, we can just leave the registers alone and everything
237      * will work fine.
238      */
239     /* don't do much */
240     return;
241 }
242
243 /* set the tfp410 power state */
244 static void tfp410_dpms(struct intel_dvo_device *dvo, int mode)
245 {
246         uint8_t ctl1;
247
248         if (!tfp410_readb(dvo, TFP410_CTL_1, &ctl1))
249                 return;
250
251         if (mode == DRM_MODE_DPMS_ON)
252                 ctl1 |= TFP410_CTL_1_PD;
253         else
254                 ctl1 &= ~TFP410_CTL_1_PD;
255
256         tfp410_writeb(dvo, TFP410_CTL_1, ctl1);
257 }
258
259 static void tfp410_dump_regs(struct intel_dvo_device *dvo)
260 {
261         uint8_t val, val2;
262
263         tfp410_readb(dvo, TFP410_REV, &val);
264         DRM_DEBUG("TFP410_REV: 0x%02X\n", val);
265         tfp410_readb(dvo, TFP410_CTL_1, &val);
266         DRM_DEBUG("TFP410_CTL1: 0x%02X\n", val);
267         tfp410_readb(dvo, TFP410_CTL_2, &val);
268         DRM_DEBUG("TFP410_CTL2: 0x%02X\n", val);
269         tfp410_readb(dvo, TFP410_CTL_3, &val);
270         DRM_DEBUG("TFP410_CTL3: 0x%02X\n", val);
271         tfp410_readb(dvo, TFP410_USERCFG, &val);
272         DRM_DEBUG("TFP410_USERCFG: 0x%02X\n", val);
273         tfp410_readb(dvo, TFP410_DE_DLY, &val);
274         DRM_DEBUG("TFP410_DE_DLY: 0x%02X\n", val);
275         tfp410_readb(dvo, TFP410_DE_CTL, &val);
276         DRM_DEBUG("TFP410_DE_CTL: 0x%02X\n", val);
277         tfp410_readb(dvo, TFP410_DE_TOP, &val);
278         DRM_DEBUG("TFP410_DE_TOP: 0x%02X\n", val);
279         tfp410_readb(dvo, TFP410_DE_CNT_LO, &val);
280         tfp410_readb(dvo, TFP410_DE_CNT_HI, &val2);
281         DRM_DEBUG("TFP410_DE_CNT: 0x%02X%02X\n", val2, val);
282         tfp410_readb(dvo, TFP410_DE_LIN_LO, &val);
283         tfp410_readb(dvo, TFP410_DE_LIN_HI, &val2);
284         DRM_DEBUG("TFP410_DE_LIN: 0x%02X%02X\n", val2, val);
285         tfp410_readb(dvo, TFP410_H_RES_LO, &val);
286         tfp410_readb(dvo, TFP410_H_RES_HI, &val2);
287         DRM_DEBUG("TFP410_H_RES: 0x%02X%02X\n", val2, val);
288         tfp410_readb(dvo, TFP410_V_RES_LO, &val);
289         tfp410_readb(dvo, TFP410_V_RES_HI, &val2);
290         DRM_DEBUG("TFP410_V_RES: 0x%02X%02X\n", val2, val);
291 }
292
293 static void tfp410_save(struct intel_dvo_device *dvo)
294 {
295         struct tfp410_priv *tfp = dvo->dev_priv;
296
297         if (!tfp410_readb(dvo, TFP410_CTL_1, &tfp->saved_reg.ctl1))
298                 return;
299
300         if (!tfp410_readb(dvo, TFP410_CTL_2, &tfp->saved_reg.ctl2))
301                 return;
302 }
303
304 static void tfp410_restore(struct intel_dvo_device *dvo)
305 {
306         struct tfp410_priv *tfp = dvo->dev_priv;
307
308         /* Restore it powered down initially */
309         tfp410_writeb(dvo, TFP410_CTL_1, tfp->saved_reg.ctl1 & ~0x1);
310
311         tfp410_writeb(dvo, TFP410_CTL_2, tfp->saved_reg.ctl2);
312         tfp410_writeb(dvo, TFP410_CTL_1, tfp->saved_reg.ctl1);
313 }
314
315 static void tfp410_destroy(struct intel_dvo_device *dvo)
316 {
317         struct tfp410_priv *tfp = dvo->dev_priv;
318
319         if (tfp) {
320                 kfree(tfp);
321                 dvo->dev_priv = NULL;
322         }
323 }
324
325 struct intel_dvo_dev_ops tfp410_ops = {
326         .init = tfp410_init,
327         .detect = tfp410_detect,
328         .mode_valid = tfp410_mode_valid,
329         .mode_set = tfp410_mode_set,
330         .dpms = tfp410_dpms,
331         .dump_regs = tfp410_dump_regs,
332         .save = tfp410_save,
333         .restore = tfp410_restore,
334         .destroy = tfp410_destroy,
335 };