1/**************************************************************************
  2
  3Copyright © 2006 Dave Airlie
  4
  5All Rights Reserved.
  6
  7Permission is hereby granted, free of charge, to any person obtaining a
  8copy of this software and associated documentation files (the
  9"Software"), to deal in the Software without restriction, including
 10without limitation the rights to use, copy, modify, merge, publish,
 11distribute, sub license, and/or sell copies of the Software, and to
 12permit persons to whom the Software is furnished to do so, subject to
 13the following conditions:
 14
 15The above copyright notice and this permission notice (including the
 16next paragraph) shall be included in all copies or substantial portions
 17of the Software.
 18
 19THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 20OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 21MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 22IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 23ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 24TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 25SOFTWARE 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
 62struct sil164_priv {
 63	//I2CDevRec d;
 64	bool quiet;
 65};
 66
 67#define SILPTR(d) ((SIL164Ptr)(d->DriverPrivate.ptr))
 68
 69static 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
106static 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 */
133static 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
170out:
171	kfree(sil);
172	return false;
173}
174
175static 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
187static 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
193static 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 */
212static 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
230static 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
245static 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
261static 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
271const 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};