1// SPDX-License-Identifier: GPL-2.0
2#include "radeonfb.h"
3
4#include <linux/module.h>
5#include <linux/kernel.h>
6#include <linux/delay.h>
7#include <linux/fb.h>
8
9
10#include <linux/i2c.h>
11#include <linux/i2c-algo-bit.h>
12
13#include <asm/io.h>
14
15#include <video/radeon.h>
16#include "../edid.h"
17
18static void radeon_gpio_setscl(void* data, int state)
19{
20	struct radeon_i2c_chan 	*chan = data;
21	struct radeonfb_info	*rinfo = chan->rinfo;
22	u32			val;
23
24	val = INREG(chan->ddc_reg) & ~(VGA_DDC_CLK_OUT_EN);
25	if (!state)
26		val |= VGA_DDC_CLK_OUT_EN;
27
28	OUTREG(chan->ddc_reg, val);
29	(void)INREG(chan->ddc_reg);
30}
31
32static void radeon_gpio_setsda(void* data, int state)
33{
34	struct radeon_i2c_chan 	*chan = data;
35	struct radeonfb_info	*rinfo = chan->rinfo;
36	u32			val;
37
38	val = INREG(chan->ddc_reg) & ~(VGA_DDC_DATA_OUT_EN);
39	if (!state)
40		val |= VGA_DDC_DATA_OUT_EN;
41
42	OUTREG(chan->ddc_reg, val);
43	(void)INREG(chan->ddc_reg);
44}
45
46static int radeon_gpio_getscl(void* data)
47{
48	struct radeon_i2c_chan 	*chan = data;
49	struct radeonfb_info	*rinfo = chan->rinfo;
50	u32			val;
51
52	val = INREG(chan->ddc_reg);
53
54	return (val & VGA_DDC_CLK_INPUT) ? 1 : 0;
55}
56
57static int radeon_gpio_getsda(void* data)
58{
59	struct radeon_i2c_chan 	*chan = data;
60	struct radeonfb_info	*rinfo = chan->rinfo;
61	u32			val;
62
63	val = INREG(chan->ddc_reg);
64
65	return (val & VGA_DDC_DATA_INPUT) ? 1 : 0;
66}
67
68static int radeon_setup_i2c_bus(struct radeon_i2c_chan *chan, const char *name)
69{
70	int rc;
71
72	snprintf(chan->adapter.name, sizeof(chan->adapter.name),
73		 "radeonfb %s", name);
74	chan->adapter.owner		= THIS_MODULE;
75	chan->adapter.algo_data		= &chan->algo;
76	chan->adapter.dev.parent	= &chan->rinfo->pdev->dev;
77	chan->algo.setsda		= radeon_gpio_setsda;
78	chan->algo.setscl		= radeon_gpio_setscl;
79	chan->algo.getsda		= radeon_gpio_getsda;
80	chan->algo.getscl		= radeon_gpio_getscl;
81	chan->algo.udelay		= 10;
82	chan->algo.timeout		= 20;
83	chan->algo.data 		= chan;
84
85	i2c_set_adapdata(&chan->adapter, chan);
86
87	/* Raise SCL and SDA */
88	radeon_gpio_setsda(chan, 1);
89	radeon_gpio_setscl(chan, 1);
90	udelay(20);
91
92	rc = i2c_bit_add_bus(&chan->adapter);
93	if (rc == 0)
94		dev_dbg(&chan->rinfo->pdev->dev, "I2C bus %s registered.\n", name);
95	else
96		dev_warn(&chan->rinfo->pdev->dev, "Failed to register I2C bus %s.\n", name);
97	return rc;
98}
99
100void radeon_create_i2c_busses(struct radeonfb_info *rinfo)
101{
102	rinfo->i2c[0].rinfo	= rinfo;
103	rinfo->i2c[0].ddc_reg	= GPIO_MONID;
104#ifndef CONFIG_PPC
105	rinfo->i2c[0].adapter.class = I2C_CLASS_HWMON;
106#endif
107	radeon_setup_i2c_bus(&rinfo->i2c[0], "monid");
108
109	rinfo->i2c[1].rinfo	= rinfo;
110	rinfo->i2c[1].ddc_reg	= GPIO_DVI_DDC;
111	radeon_setup_i2c_bus(&rinfo->i2c[1], "dvi");
112
113	rinfo->i2c[2].rinfo	= rinfo;
114	rinfo->i2c[2].ddc_reg	= GPIO_VGA_DDC;
115	radeon_setup_i2c_bus(&rinfo->i2c[2], "vga");
116
117	rinfo->i2c[3].rinfo	= rinfo;
118	rinfo->i2c[3].ddc_reg	= GPIO_CRT2_DDC;
119	radeon_setup_i2c_bus(&rinfo->i2c[3], "crt2");
120}
121
122void radeon_delete_i2c_busses(struct radeonfb_info *rinfo)
123{
124	if (rinfo->i2c[0].rinfo)
125		i2c_del_adapter(&rinfo->i2c[0].adapter);
126	rinfo->i2c[0].rinfo = NULL;
127
128	if (rinfo->i2c[1].rinfo)
129		i2c_del_adapter(&rinfo->i2c[1].adapter);
130	rinfo->i2c[1].rinfo = NULL;
131
132	if (rinfo->i2c[2].rinfo)
133		i2c_del_adapter(&rinfo->i2c[2].adapter);
134	rinfo->i2c[2].rinfo = NULL;
135
136	if (rinfo->i2c[3].rinfo)
137		i2c_del_adapter(&rinfo->i2c[3].adapter);
138	rinfo->i2c[3].rinfo = NULL;
139}
140
141int radeon_probe_i2c_connector(struct radeonfb_info *rinfo, int conn,
142			       u8 **out_edid)
143{
144	u8 *edid;
145
146	edid = fb_ddc_read(&rinfo->i2c[conn-1].adapter);
147
148	if (out_edid)
149		*out_edid = edid;
150	if (!edid) {
151		pr_debug("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			pr_debug("radeonfb: I2C (port %d) ... found LVDS panel\n", conn);
159			return MT_LCD;
160		} else {
161			pr_debug("radeonfb: I2C (port %d) ... found TMDS panel\n", conn);
162			return MT_DFP;
163		}
164	}
165	pr_debug("radeonfb: I2C (port %d) ... found CRT display\n", conn);
166	return MT_CRT;
167}
168
169