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Alan Hourihanedbe7e422007-05-08 00:39:25 -07001/*
2 * Copyright (c) Intel Corp. 2007.
3 * All Rights Reserved.
4 *
5 * Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
6 * develop this driver.
7 *
8 * This file is part of the Carillo Ranch video subsystem driver.
9 * The Carillo Ranch video subsystem driver is free software;
10 * you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * The Carillo Ranch video subsystem driver is distributed
16 * in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this driver; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 *
25 * Authors:
26 * Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
27 * Alan Hourihane <alanh-at-tungstengraphics-dot-com>
28 */
29
Jingoo Han31e64322012-05-29 15:07:17 -070030#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31
Alan Hourihanedbe7e422007-05-08 00:39:25 -070032#include <linux/module.h>
33#include <linux/kernel.h>
34#include <linux/init.h>
35#include <linux/platform_device.h>
36#include <linux/mutex.h>
37#include <linux/fb.h>
38#include <linux/backlight.h>
39#include <linux/lcd.h>
40#include <linux/pci.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090041#include <linux/slab.h>
Alan Hourihanedbe7e422007-05-08 00:39:25 -070042
43/* The LVDS- and panel power controls sits on the
44 * GPIO port of the ISA bridge.
45 */
46
47#define CRVML_DEVICE_LPC 0x27B8
48#define CRVML_REG_GPIOBAR 0x48
49#define CRVML_REG_GPIOEN 0x4C
50#define CRVML_GPIOEN_BIT (1 << 4)
51#define CRVML_PANEL_PORT 0x38
52#define CRVML_LVDS_ON 0x00000001
53#define CRVML_PANEL_ON 0x00000002
54#define CRVML_BACKLIGHT_OFF 0x00000004
55
56/* The PLL Clock register sits on Host bridge */
57#define CRVML_DEVICE_MCH 0x5001
58#define CRVML_REG_MCHBAR 0x44
59#define CRVML_REG_MCHEN 0x54
60#define CRVML_MCHEN_BIT (1 << 28)
61#define CRVML_MCHMAP_SIZE 4096
62#define CRVML_REG_CLOCK 0xc3c
63#define CRVML_CLOCK_SHIFT 8
64#define CRVML_CLOCK_MASK 0x00000f00
65
66static struct pci_dev *lpc_dev;
67static u32 gpio_bar;
68
69struct cr_panel {
70 struct backlight_device *cr_backlight_device;
71 struct lcd_device *cr_lcd_device;
72};
73
74static int cr_backlight_set_intensity(struct backlight_device *bd)
75{
76 int intensity = bd->props.brightness;
77 u32 addr = gpio_bar + CRVML_PANEL_PORT;
78 u32 cur = inl(addr);
79
80 if (bd->props.power == FB_BLANK_UNBLANK)
81 intensity = FB_BLANK_UNBLANK;
82 if (bd->props.fb_blank == FB_BLANK_UNBLANK)
83 intensity = FB_BLANK_UNBLANK;
84 if (bd->props.power == FB_BLANK_POWERDOWN)
85 intensity = FB_BLANK_POWERDOWN;
86 if (bd->props.fb_blank == FB_BLANK_POWERDOWN)
87 intensity = FB_BLANK_POWERDOWN;
88
89 if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */
90 cur &= ~CRVML_BACKLIGHT_OFF;
91 outl(cur, addr);
92 } else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */
93 cur |= CRVML_BACKLIGHT_OFF;
94 outl(cur, addr);
95 } /* anything else, don't bother */
96
97 return 0;
98}
99
100static int cr_backlight_get_intensity(struct backlight_device *bd)
101{
102 u32 addr = gpio_bar + CRVML_PANEL_PORT;
103 u32 cur = inl(addr);
104 u8 intensity;
105
106 if (cur & CRVML_BACKLIGHT_OFF)
107 intensity = FB_BLANK_POWERDOWN;
108 else
109 intensity = FB_BLANK_UNBLANK;
110
111 return intensity;
112}
113
Emese Revfy9905a432009-12-14 00:58:57 +0100114static const struct backlight_ops cr_backlight_ops = {
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700115 .get_brightness = cr_backlight_get_intensity,
116 .update_status = cr_backlight_set_intensity,
117};
118
119static void cr_panel_on(void)
120{
121 u32 addr = gpio_bar + CRVML_PANEL_PORT;
122 u32 cur = inl(addr);
123
124 if (!(cur & CRVML_PANEL_ON)) {
125 /* Make sure LVDS controller is down. */
126 if (cur & 0x00000001) {
127 cur &= ~CRVML_LVDS_ON;
128 outl(cur, addr);
129 }
130 /* Power up Panel */
131 schedule_timeout(HZ / 10);
132 cur |= CRVML_PANEL_ON;
133 outl(cur, addr);
134 }
135
136 /* Power up LVDS controller */
137
138 if (!(cur & CRVML_LVDS_ON)) {
139 schedule_timeout(HZ / 10);
140 outl(cur | CRVML_LVDS_ON, addr);
141 }
142}
143
144static void cr_panel_off(void)
145{
146 u32 addr = gpio_bar + CRVML_PANEL_PORT;
147 u32 cur = inl(addr);
148
149 /* Power down LVDS controller first to avoid high currents */
150 if (cur & CRVML_LVDS_ON) {
151 cur &= ~CRVML_LVDS_ON;
152 outl(cur, addr);
153 }
154 if (cur & CRVML_PANEL_ON) {
155 schedule_timeout(HZ / 10);
156 outl(cur & ~CRVML_PANEL_ON, addr);
157 }
158}
159
160static int cr_lcd_set_power(struct lcd_device *ld, int power)
161{
162 if (power == FB_BLANK_UNBLANK)
163 cr_panel_on();
164 if (power == FB_BLANK_POWERDOWN)
165 cr_panel_off();
166
167 return 0;
168}
169
170static struct lcd_ops cr_lcd_ops = {
171 .set_power = cr_lcd_set_power,
172};
173
174static int cr_backlight_probe(struct platform_device *pdev)
175{
Matthew Garretta19a6ee2010-02-17 16:39:44 -0500176 struct backlight_properties props;
Jesper Juhl0b75f2d2007-08-11 10:29:59 +0100177 struct backlight_device *bdp;
178 struct lcd_device *ldp;
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700179 struct cr_panel *crp;
180 u8 dev_en;
181
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700182 lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL,
183 CRVML_DEVICE_LPC, NULL);
184 if (!lpc_dev) {
Jingoo Han31e64322012-05-29 15:07:17 -0700185 pr_err("INTEL CARILLO RANCH LPC not found.\n");
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700186 return -ENODEV;
187 }
188
189 pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en);
190 if (!(dev_en & CRVML_GPIOEN_BIT)) {
Jingoo Han31e64322012-05-29 15:07:17 -0700191 pr_err("Carillo Ranch GPIO device was not enabled.\n");
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700192 pci_dev_put(lpc_dev);
193 return -ENODEV;
194 }
195
Matthew Garretta19a6ee2010-02-17 16:39:44 -0500196 memset(&props, 0, sizeof(struct backlight_properties));
Matthew Garrettbb7ca742011-03-22 16:30:21 -0700197 props.type = BACKLIGHT_RAW;
Jingoo Han289a65e2013-11-12 15:09:35 -0800198 bdp = devm_backlight_device_register(&pdev->dev, "cr-backlight",
199 &pdev->dev, NULL, &cr_backlight_ops,
200 &props);
Jesper Juhl0b75f2d2007-08-11 10:29:59 +0100201 if (IS_ERR(bdp)) {
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700202 pci_dev_put(lpc_dev);
Jesper Juhl0b75f2d2007-08-11 10:29:59 +0100203 return PTR_ERR(bdp);
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700204 }
205
Jingoo Han289a65e2013-11-12 15:09:35 -0800206 ldp = devm_lcd_device_register(&pdev->dev, "cr-lcd", &pdev->dev, NULL,
207 &cr_lcd_ops);
Jesper Juhl0b75f2d2007-08-11 10:29:59 +0100208 if (IS_ERR(ldp)) {
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700209 pci_dev_put(lpc_dev);
Roel Kluin5b0582e2009-12-07 14:35:32 +0100210 return PTR_ERR(ldp);
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700211 }
212
213 pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR,
214 &gpio_bar);
215 gpio_bar &= ~0x3F;
216
Julia Lawallce969222012-03-23 15:02:00 -0700217 crp = devm_kzalloc(&pdev->dev, sizeof(*crp), GFP_KERNEL);
Jesper Juhl0b75f2d2007-08-11 10:29:59 +0100218 if (!crp) {
Jesper Juhl0b75f2d2007-08-11 10:29:59 +0100219 pci_dev_put(lpc_dev);
220 return -ENOMEM;
221 }
222
223 crp->cr_backlight_device = bdp;
224 crp->cr_lcd_device = ldp;
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700225 crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK;
226 crp->cr_backlight_device->props.brightness = 0;
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700227 cr_backlight_set_intensity(crp->cr_backlight_device);
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700228 cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK);
229
230 platform_set_drvdata(pdev, crp);
231
232 return 0;
233}
234
235static int cr_backlight_remove(struct platform_device *pdev)
236{
237 struct cr_panel *crp = platform_get_drvdata(pdev);
238 crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN;
239 crp->cr_backlight_device->props.brightness = 0;
240 crp->cr_backlight_device->props.max_brightness = 0;
241 cr_backlight_set_intensity(crp->cr_backlight_device);
242 cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN);
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700243 pci_dev_put(lpc_dev);
244
245 return 0;
246}
247
248static struct platform_driver cr_backlight_driver = {
249 .probe = cr_backlight_probe,
250 .remove = cr_backlight_remove,
251 .driver = {
252 .name = "cr_backlight",
253 },
254};
255
256static struct platform_device *crp;
257
258static int __init cr_backlight_init(void)
259{
260 int ret = platform_driver_register(&cr_backlight_driver);
261
Akinobu Mitab4a11d32008-11-17 15:21:32 +0000262 if (ret)
263 return ret;
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700264
Akinobu Mitab4a11d32008-11-17 15:21:32 +0000265 crp = platform_device_register_simple("cr_backlight", -1, NULL, 0);
266 if (IS_ERR(crp)) {
267 platform_driver_unregister(&cr_backlight_driver);
268 return PTR_ERR(crp);
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700269 }
270
Jingoo Han31e64322012-05-29 15:07:17 -0700271 pr_info("Carillo Ranch Backlight Driver Initialized.\n");
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700272
Akinobu Mitab4a11d32008-11-17 15:21:32 +0000273 return 0;
Alan Hourihanedbe7e422007-05-08 00:39:25 -0700274}
275
276static void __exit cr_backlight_exit(void)
277{
278 platform_device_unregister(crp);
279 platform_driver_unregister(&cr_backlight_driver);
280}
281
282module_init(cr_backlight_init);
283module_exit(cr_backlight_exit);
284
285MODULE_AUTHOR("Tungsten Graphics Inc.");
286MODULE_DESCRIPTION("Carillo Ranch Backlight Driver");
287MODULE_LICENSE("GPL");