/drivers/video/matrox/i2c-matroxfb.c

  1/*
  2 *
  3 * Hardware accelerated Matrox Millennium I, II, Mystique, G100, G200, G400 and G450.
  4 *
  5 * (c) 1998-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
  6 *
  7 * Version: 1.64 2002/06/10
  8 *
  9 * See matroxfb_base.c for contributors.
 10 *
 11 */
 12
 13#include "matroxfb_base.h"
 14#include "matroxfb_maven.h"
 15#include <linux/i2c.h>
 16#include <linux/slab.h>
 17#include <linux/i2c-algo-bit.h>
 18
 19/* MGA-TVO I2C for G200, G400 */
 20#define MAT_CLK		0x20
 21#define MAT_DATA	0x10
 22/* primary head DDC for Mystique(?), G100, G200, G400 */
 23#define DDC1_CLK	0x08
 24#define DDC1_DATA	0x02
 25/* primary head DDC for Millennium, Millennium II */
 26#define DDC1B_CLK	0x10
 27#define DDC1B_DATA	0x04
 28/* secondary head DDC for G400 */
 29#define DDC2_CLK	0x04
 30#define DDC2_DATA	0x01
 31
 32/******************************************************/
 33
 34struct matroxfb_dh_maven_info {
 35	struct i2c_bit_adapter	maven;
 36	struct i2c_bit_adapter	ddc1;
 37	struct i2c_bit_adapter	ddc2;
 38};
 39
 40static int matroxfb_read_gpio(struct matrox_fb_info* minfo) {
 41	unsigned long flags;
 42	int v;
 43
 44	matroxfb_DAC_lock_irqsave(flags);
 45	v = matroxfb_DAC_in(minfo, DAC_XGENIODATA);
 46	matroxfb_DAC_unlock_irqrestore(flags);
 47	return v;
 48}
 49
 50static void matroxfb_set_gpio(struct matrox_fb_info* minfo, int mask, int val) {
 51	unsigned long flags;
 52	int v;
 53
 54	matroxfb_DAC_lock_irqsave(flags);
 55	v = (matroxfb_DAC_in(minfo, DAC_XGENIOCTRL) & mask) | val;
 56	matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, v);
 57	/* We must reset GENIODATA very often... XFree plays with this register */
 58	matroxfb_DAC_out(minfo, DAC_XGENIODATA, 0x00);
 59	matroxfb_DAC_unlock_irqrestore(flags);
 60}
 61
 62/* software I2C functions */
 63static inline void matroxfb_i2c_set(struct matrox_fb_info* minfo, int mask, int state) {
 64	if (state)
 65		state = 0;
 66	else
 67		state = mask;
 68	matroxfb_set_gpio(minfo, ~mask, state);
 69}
 70
 71static void matroxfb_gpio_setsda(void* data, int state) {
 72	struct i2c_bit_adapter* b = data;
 73	matroxfb_i2c_set(b->minfo, b->mask.data, state);
 74}
 75
 76static void matroxfb_gpio_setscl(void* data, int state) {
 77	struct i2c_bit_adapter* b = data;
 78	matroxfb_i2c_set(b->minfo, b->mask.clock, state);
 79}
 80
 81static int matroxfb_gpio_getsda(void* data) {
 82	struct i2c_bit_adapter* b = data;
 83	return (matroxfb_read_gpio(b->minfo) & b->mask.data) ? 1 : 0;
 84}
 85
 86static int matroxfb_gpio_getscl(void* data) {
 87	struct i2c_bit_adapter* b = data;
 88	return (matroxfb_read_gpio(b->minfo) & b->mask.clock) ? 1 : 0;
 89}
 90
 91static const struct i2c_algo_bit_data matrox_i2c_algo_template =
 92{
 93	.setsda		= matroxfb_gpio_setsda,
 94	.setscl		= matroxfb_gpio_setscl,
 95	.getsda		= matroxfb_gpio_getsda,
 96	.getscl		= matroxfb_gpio_getscl,
 97	.udelay		= 10,
 98	.timeout	= 100,
 99};
100
101static int i2c_bus_reg(struct i2c_bit_adapter* b, struct matrox_fb_info* minfo, 
102		unsigned int data, unsigned int clock, const char *name,
103		int class)
104{
105	int err;
106
107	b->minfo = minfo;
108	b->mask.data = data;
109	b->mask.clock = clock;
110	b->adapter.owner = THIS_MODULE;
111	snprintf(b->adapter.name, sizeof(b->adapter.name), name,
112		minfo->fbcon.node);
113	i2c_set_adapdata(&b->adapter, b);
114	b->adapter.class = class;
115	b->adapter.algo_data = &b->bac;
116	b->adapter.dev.parent = &minfo->pcidev->dev;
117	b->bac = matrox_i2c_algo_template;
118	b->bac.data = b;
119	err = i2c_bit_add_bus(&b->adapter);
120	b->initialized = !err;
121	return err;
122}
123
124static void i2c_bit_bus_del(struct i2c_bit_adapter* b) {
125	if (b->initialized) {
126		i2c_del_adapter(&b->adapter);
127		b->initialized = 0;
128	}
129}
130
131static inline void i2c_maven_done(struct matroxfb_dh_maven_info* minfo2) {
132	i2c_bit_bus_del(&minfo2->maven);
133}
134
135static inline void i2c_ddc1_done(struct matroxfb_dh_maven_info* minfo2) {
136	i2c_bit_bus_del(&minfo2->ddc1);
137}
138
139static inline void i2c_ddc2_done(struct matroxfb_dh_maven_info* minfo2) {
140	i2c_bit_bus_del(&minfo2->ddc2);
141}
142
143static void* i2c_matroxfb_probe(struct matrox_fb_info* minfo) {
144	int err;
145	unsigned long flags;
146	struct matroxfb_dh_maven_info* m2info;
147
148	m2info = kzalloc(sizeof(*m2info), GFP_KERNEL);
149	if (!m2info)
150		return NULL;
151
152	matroxfb_DAC_lock_irqsave(flags);
153	matroxfb_DAC_out(minfo, DAC_XGENIODATA, 0xFF);
154	matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, 0x00);
155	matroxfb_DAC_unlock_irqrestore(flags);
156
157	switch (minfo->chip) {
158		case MGA_2064:
159		case MGA_2164:
160			err = i2c_bus_reg(&m2info->ddc1, minfo,
161					  DDC1B_DATA, DDC1B_CLK,
162					  "DDC:fb%u #0", I2C_CLASS_DDC);
163			break;
164		default:
165			err = i2c_bus_reg(&m2info->ddc1, minfo,
166					  DDC1_DATA, DDC1_CLK,
167					  "DDC:fb%u #0", I2C_CLASS_DDC);
168			break;
169	}
170	if (err)
171		goto fail_ddc1;
172	if (minfo->devflags.dualhead) {
173		err = i2c_bus_reg(&m2info->ddc2, minfo,
174				  DDC2_DATA, DDC2_CLK,
175				  "DDC:fb%u #1", I2C_CLASS_DDC);
176		if (err == -ENODEV) {
177			printk(KERN_INFO "i2c-matroxfb: VGA->TV plug detected, DDC unavailable.\n");
178		} else if (err)
179			printk(KERN_INFO "i2c-matroxfb: Could not register secondary output i2c bus. Continuing anyway.\n");
180		/* Register maven bus even on G450/G550 */
181		err = i2c_bus_reg(&m2info->maven, minfo,
182				  MAT_DATA, MAT_CLK, "MAVEN:fb%u", 0);
183		if (err)
184			printk(KERN_INFO "i2c-matroxfb: Could not register Maven i2c bus. Continuing anyway.\n");
185		else {
186			struct i2c_board_info maven_info = {
187				I2C_BOARD_INFO("maven", 0x1b),
188			};
189			unsigned short const addr_list[2] = {
190				0x1b, I2C_CLIENT_END
191			};
192
193			i2c_new_probed_device(&m2info->maven.adapter,
194					      &maven_info, addr_list, NULL);
195		}
196	}
197	return m2info;
198fail_ddc1:;
199	kfree(m2info);
200	printk(KERN_ERR "i2c-matroxfb: Could not register primary adapter DDC bus.\n");
201	return NULL;
202}
203
204static void i2c_matroxfb_remove(struct matrox_fb_info* minfo, void* data) {
205	struct matroxfb_dh_maven_info* m2info = data;
206
207	i2c_maven_done(m2info);
208	i2c_ddc2_done(m2info);
209	i2c_ddc1_done(m2info);
210	kfree(m2info);
211}
212
213static struct matroxfb_driver i2c_matroxfb = {
214	.node =		LIST_HEAD_INIT(i2c_matroxfb.node),
215	.name =		"i2c-matroxfb",
216	.probe = 	i2c_matroxfb_probe,
217	.remove =	i2c_matroxfb_remove,
218};
219
220static int __init i2c_matroxfb_init(void) {
221	if (matroxfb_register_driver(&i2c_matroxfb)) {
222		printk(KERN_ERR "i2c-matroxfb: failed to register driver\n");
223		return -ENXIO;
224	}
225	return 0;
226}
227
228static void __exit i2c_matroxfb_exit(void) {
229	matroxfb_unregister_driver(&i2c_matroxfb);
230}
231
232MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
233MODULE_DESCRIPTION("Support module providing I2C buses present on Matrox videocards");
234
235module_init(i2c_matroxfb_init);
236module_exit(i2c_matroxfb_exit);
237/* no __setup required */
238MODULE_LICENSE("GPL");