i2c-matroxfb.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 *
  4 * Hardware accelerated Matrox Millennium I, II, Mystique, G100, G200, G400 and G450.
  5 *
  6 * (c) 1998-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
  7 *
  8 * Version: 1.64 2002/06/10
  9 *
 10 * See matroxfb_base.c for contributors.
 11 *
 12 */
 13
 14#include "matroxfb_base.h"
 15#include "matroxfb_maven.h"
 16#include <linux/i2c.h>
 17#include <linux/slab.h>
 18#include <linux/i2c-algo-bit.h>
 19
 20/* MGA-TVO I2C for G200, G400 */
 21#define MAT_CLK		0x20
 22#define MAT_DATA	0x10
 23/* primary head DDC for Mystique(?), G100, G200, G400 */
 24#define DDC1_CLK	0x08
 25#define DDC1_DATA	0x02
 26/* primary head DDC for Millennium, Millennium II */
 27#define DDC1B_CLK	0x10
 28#define DDC1B_DATA	0x04
 29/* secondary head DDC for G400 */
 30#define DDC2_CLK	0x04
 31#define DDC2_DATA	0x01
 32
 33/******************************************************/
 34
 35struct matroxfb_dh_maven_info {
 36	struct i2c_bit_adapter	maven;
 37	struct i2c_bit_adapter	ddc1;
 38	struct i2c_bit_adapter	ddc2;
 39};
 40
 41static int matroxfb_read_gpio(struct matrox_fb_info* minfo) {
 42	unsigned long flags;
 43	int v;
 44
 45	matroxfb_DAC_lock_irqsave(flags);
 46	v = matroxfb_DAC_in(minfo, DAC_XGENIODATA);
 47	matroxfb_DAC_unlock_irqrestore(flags);
 48	return v;
 49}
 50
 51static void matroxfb_set_gpio(struct matrox_fb_info* minfo, int mask, int val) {
 52	unsigned long flags;
 53	int v;
 54
 55	matroxfb_DAC_lock_irqsave(flags);
 56	v = (matroxfb_DAC_in(minfo, DAC_XGENIOCTRL) & mask) | val;
 57	matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, v);
 58	/* We must reset GENIODATA very often... XFree plays with this register */
 59	matroxfb_DAC_out(minfo, DAC_XGENIODATA, 0x00);
 60	matroxfb_DAC_unlock_irqrestore(flags);
 61}
 62
 63/* software I2C functions */
 64static inline void matroxfb_i2c_set(struct matrox_fb_info* minfo, int mask, int state) {
 65	if (state)
 66		state = 0;
 67	else
 68		state = mask;
 69	matroxfb_set_gpio(minfo, ~mask, state);
 70}
 71
 72static void matroxfb_gpio_setsda(void* data, int state) {
 73	struct i2c_bit_adapter* b = data;
 74	matroxfb_i2c_set(b->minfo, b->mask.data, state);
 75}
 76
 77static void matroxfb_gpio_setscl(void* data, int state) {
 78	struct i2c_bit_adapter* b = data;
 79	matroxfb_i2c_set(b->minfo, b->mask.clock, state);
 80}
 81
 82static int matroxfb_gpio_getsda(void* data) {
 83	struct i2c_bit_adapter* b = data;
 84	return (matroxfb_read_gpio(b->minfo) & b->mask.data) ? 1 : 0;
 85}
 86
 87static int matroxfb_gpio_getscl(void* data) {
 88	struct i2c_bit_adapter* b = data;
 89	return (matroxfb_read_gpio(b->minfo) & b->mask.clock) ? 1 : 0;
 90}
 91
 92static const struct i2c_algo_bit_data matrox_i2c_algo_template =
 93{
 94	.setsda		= matroxfb_gpio_setsda,
 95	.setscl		= matroxfb_gpio_setscl,
 96	.getsda		= matroxfb_gpio_getsda,
 97	.getscl		= matroxfb_gpio_getscl,
 98	.udelay		= 10,
 99	.timeout	= 100,
100};
101
102static int i2c_bus_reg(struct i2c_bit_adapter* b, struct matrox_fb_info* minfo, 
103		unsigned int data, unsigned int clock, const char *name)
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.algo_data = &b->bac;
115	b->adapter.dev.parent = &minfo->pcidev->dev;
116	b->bac = matrox_i2c_algo_template;
117	b->bac.data = b;
118	err = i2c_bit_add_bus(&b->adapter);
119	b->initialized = !err;
120	return err;
121}
122
123static void i2c_bit_bus_del(struct i2c_bit_adapter* b) {
124	if (b->initialized) {
125		i2c_del_adapter(&b->adapter);
126		b->initialized = 0;
127	}
128}
129
130static inline void i2c_maven_done(struct matroxfb_dh_maven_info* minfo2) {
131	i2c_bit_bus_del(&minfo2->maven);
132}
133
134static inline void i2c_ddc1_done(struct matroxfb_dh_maven_info* minfo2) {
135	i2c_bit_bus_del(&minfo2->ddc1);
136}
137
138static inline void i2c_ddc2_done(struct matroxfb_dh_maven_info* minfo2) {
139	i2c_bit_bus_del(&minfo2->ddc2);
140}
141
142static void* i2c_matroxfb_probe(struct matrox_fb_info* minfo) {
143	int err;
144	unsigned long flags;
145	struct matroxfb_dh_maven_info* m2info;
146
147	m2info = kzalloc(sizeof(*m2info), GFP_KERNEL);
148	if (!m2info)
149		return NULL;
150
151	matroxfb_DAC_lock_irqsave(flags);
152	matroxfb_DAC_out(minfo, DAC_XGENIODATA, 0xFF);
153	matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, 0x00);
154	matroxfb_DAC_unlock_irqrestore(flags);
155
156	switch (minfo->chip) {
157		case MGA_2064:
158		case MGA_2164:
159			err = i2c_bus_reg(&m2info->ddc1, minfo,
160					  DDC1B_DATA, DDC1B_CLK,
161					  "DDC:fb%u #0");
162			break;
163		default:
164			err = i2c_bus_reg(&m2info->ddc1, minfo,
165					  DDC1_DATA, DDC1_CLK,
166					  "DDC:fb%u #0");
167			break;
168	}
169	if (err)
170		goto fail_ddc1;
171	if (minfo->devflags.dualhead) {
172		err = i2c_bus_reg(&m2info->ddc2, minfo, DDC2_DATA, DDC2_CLK, "DDC:fb%u #1");
173		if (err == -ENODEV) {
174			printk(KERN_INFO "i2c-matroxfb: VGA->TV plug detected, DDC unavailable.\n");
175		} else if (err)
176			printk(KERN_INFO "i2c-matroxfb: Could not register secondary output i2c bus. Continuing anyway.\n");
177		/* Register maven bus even on G450/G550 */
178		err = i2c_bus_reg(&m2info->maven, minfo, MAT_DATA, MAT_CLK, "MAVEN:fb%u");
179		if (err)
180			printk(KERN_INFO "i2c-matroxfb: Could not register Maven i2c bus. Continuing anyway.\n");
181		else {
182			struct i2c_board_info maven_info = {
183				I2C_BOARD_INFO("maven", 0x1b),
184			};
185			unsigned short const addr_list[2] = {
186				0x1b, I2C_CLIENT_END
187			};
188
189			i2c_new_scanned_device(&m2info->maven.adapter,
190					       &maven_info, addr_list, NULL);
191		}
192	}
193	return m2info;
194fail_ddc1:;
195	kfree(m2info);
196	printk(KERN_ERR "i2c-matroxfb: Could not register primary adapter DDC bus.\n");
197	return NULL;
198}
199
200static void i2c_matroxfb_remove(struct matrox_fb_info* minfo, void* data) {
201	struct matroxfb_dh_maven_info* m2info = data;
202
203	i2c_maven_done(m2info);
204	i2c_ddc2_done(m2info);
205	i2c_ddc1_done(m2info);
206	kfree(m2info);
207}
208
209static struct matroxfb_driver i2c_matroxfb = {
210	.node =		LIST_HEAD_INIT(i2c_matroxfb.node),
211	.name =		"i2c-matroxfb",
212	.probe = 	i2c_matroxfb_probe,
213	.remove =	i2c_matroxfb_remove,
214};
215
216static int __init i2c_matroxfb_init(void) {
217	if (matroxfb_register_driver(&i2c_matroxfb)) {
218		printk(KERN_ERR "i2c-matroxfb: failed to register driver\n");
219		return -ENXIO;
220	}
221	return 0;
222}
223
224static void __exit i2c_matroxfb_exit(void) {
225	matroxfb_unregister_driver(&i2c_matroxfb);
226}
227
228MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
229MODULE_DESCRIPTION("Support module providing I2C buses present on Matrox videocards");
230
231module_init(i2c_matroxfb_init);
232module_exit(i2c_matroxfb_exit);
233/* no __setup required */
234MODULE_LICENSE("GPL");