1#include <linux/module.h>
2#include <linux/kernel.h>
3#include <linux/delay.h>
4#include <linux/fb.h>
5
6
7#include <linux/i2c.h>
8#include <linux/i2c-id.h>
9#include <linux/i2c-algo-bit.h>
10
11#include <asm/io.h>
12
13#include <video/radeon.h>
14#include "radeonfb.h"
15#include "../edid.h"
16
17static void radeon_gpio_setscl(void* data, int state)
18{
19	struct radeon_i2c_chan 	*chan = data;
20	struct radeonfb_info	*rinfo = chan->rinfo;
21	u32			val;
22
23	val = INREG(chan->ddc_reg) & ~(VGA_DDC_CLK_OUT_EN);
24	if (!state)
25		val |= VGA_DDC_CLK_OUT_EN;
26
27	OUTREG(chan->ddc_reg, val);
28	(void)INREG(chan->ddc_reg);
29}
30
31static void radeon_gpio_setsda(void* data, int state)
32{
33	struct radeon_i2c_chan 	*chan = data;
34	struct radeonfb_info	*rinfo = chan->rinfo;
35	u32			val;
36
37	val = INREG(chan->ddc_reg) & ~(VGA_DDC_DATA_OUT_EN);
38	if (!state)
39		val |= VGA_DDC_DATA_OUT_EN;
40
41	OUTREG(chan->ddc_reg, val);
42	(void)INREG(chan->ddc_reg);
43}
44
45static int radeon_gpio_getscl(void* data)
46{
47	struct radeon_i2c_chan 	*chan = data;
48	struct radeonfb_info	*rinfo = chan->rinfo;
49	u32			val;
50
51	val = INREG(chan->ddc_reg);
52
53	return (val & VGA_DDC_CLK_INPUT) ? 1 : 0;
54}
55
56static int radeon_gpio_getsda(void* data)
57{
58	struct radeon_i2c_chan 	*chan = data;
59	struct radeonfb_info	*rinfo = chan->rinfo;
60	u32			val;
61
62	val = INREG(chan->ddc_reg);
63
64	return (val & VGA_DDC_DATA_INPUT) ? 1 : 0;
65}
66
67static int radeon_setup_i2c_bus(struct radeon_i2c_chan *chan, const char *name)
68{
69	int rc;
70
71	strcpy(chan->adapter.name, name);
72	chan->adapter.owner		= THIS_MODULE;
73	chan->adapter.id		= I2C_HW_B_RADEON;
74	chan->adapter.algo_data		= &chan->algo;
75	chan->adapter.dev.parent	= &chan->rinfo->pdev->dev;
76	chan->algo.setsda		= radeon_gpio_setsda;
77	chan->algo.setscl		= radeon_gpio_setscl;
78	chan->algo.getsda		= radeon_gpio_getsda;
79	chan->algo.getscl		= radeon_gpio_getscl;
80	chan->algo.udelay		= 40;
81	chan->algo.timeout		= 20;
82	chan->algo.data 		= chan;
83
84	i2c_set_adapdata(&chan->adapter, chan);
85
86	/* Raise SCL and SDA */
87	radeon_gpio_setsda(chan, 1);
88	radeon_gpio_setscl(chan, 1);
89	udelay(20);
90
91	rc = i2c_bit_add_bus(&chan->adapter);
92	if (rc == 0)
93		dev_dbg(&chan->rinfo->pdev->dev, "I2C bus %s registered.\n", name);
94	else
95		dev_warn(&chan->rinfo->pdev->dev, "Failed to register I2C bus %s.\n", name);
96	return rc;
97}
98
99void radeon_create_i2c_busses(struct radeonfb_info *rinfo)
100{
101	rinfo->i2c[0].rinfo	= rinfo;
102	rinfo->i2c[0].ddc_reg	= GPIO_MONID;
103	radeon_setup_i2c_bus(&rinfo->i2c[0], "monid");
104
105	rinfo->i2c[1].rinfo	= rinfo;
106	rinfo->i2c[1].ddc_reg	= GPIO_DVI_DDC;
107	radeon_setup_i2c_bus(&rinfo->i2c[1], "dvi");
108
109	rinfo->i2c[2].rinfo	= rinfo;
110	rinfo->i2c[2].ddc_reg	= GPIO_VGA_DDC;
111	radeon_setup_i2c_bus(&rinfo->i2c[2], "vga");
112
113	rinfo->i2c[3].rinfo	= rinfo;
114	rinfo->i2c[3].ddc_reg	= GPIO_CRT2_DDC;
115	radeon_setup_i2c_bus(&rinfo->i2c[3], "crt2");
116}
117
118void radeon_delete_i2c_busses(struct radeonfb_info *rinfo)
119{
120	if (rinfo->i2c[0].rinfo)
121		i2c_del_adapter(&rinfo->i2c[0].adapter);
122	rinfo->i2c[0].rinfo = NULL;
123
124	if (rinfo->i2c[1].rinfo)
125		i2c_del_adapter(&rinfo->i2c[1].adapter);
126	rinfo->i2c[1].rinfo = NULL;
127
128	if (rinfo->i2c[2].rinfo)
129		i2c_del_adapter(&rinfo->i2c[2].adapter);
130	rinfo->i2c[2].rinfo = NULL;
131
132	if (rinfo->i2c[3].rinfo)
133		i2c_del_adapter(&rinfo->i2c[3].adapter);
134	rinfo->i2c[3].rinfo = NULL;
135}
136
137int radeon_probe_i2c_connector(struct radeonfb_info *rinfo, int conn,
138			       u8 **out_edid)
139{
140	u32 reg = rinfo->i2c[conn-1].ddc_reg;
141	u8 *edid;
142
143	OUTREG(reg, INREG(reg) &
144			~(VGA_DDC_DATA_OUTPUT | VGA_DDC_CLK_OUTPUT));
145
146	edid = fb_ddc_read(&rinfo->i2c[conn-1].adapter);
147
148	if (out_edid)
149		*out_edid = edid;
150	if (!edid) {
151		RTRACE("radeonfb: I2C (port %d) ... not found\n", conn);
152		return MT_NONE;
153	}
154	if (edid[0x14] & 0x80) {
155		/* Fix detection using BIOS tables */
156		if (rinfo->is_mobility /*&& conn == ddc_dvi*/ &&
157		    (INREG(LVDS_GEN_CNTL) & LVDS_ON)) {
158			RTRACE("radeonfb: I2C (port %d) ... found LVDS panel\n", conn);
159			return MT_LCD;
160		} else {
161			RTRACE("radeonfb: I2C (port %d) ... found TMDS panel\n", conn);
162			return MT_DFP;
163		}
164	}
165       	RTRACE("radeonfb: I2C (port %d) ... found CRT display\n", conn);
166	return MT_CRT;
167}
168