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dbe7e429 AH |
1 | /* |
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 | ||
30 | #include <linux/module.h> | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/platform_device.h> | |
34 | #include <linux/mutex.h> | |
35 | #include <linux/fb.h> | |
36 | #include <linux/backlight.h> | |
37 | #include <linux/lcd.h> | |
38 | #include <linux/pci.h> | |
dbe7e429 AH |
39 | |
40 | /* The LVDS- and panel power controls sits on the | |
41 | * GPIO port of the ISA bridge. | |
42 | */ | |
43 | ||
44 | #define CRVML_DEVICE_LPC 0x27B8 | |
45 | #define CRVML_REG_GPIOBAR 0x48 | |
46 | #define CRVML_REG_GPIOEN 0x4C | |
47 | #define CRVML_GPIOEN_BIT (1 << 4) | |
48 | #define CRVML_PANEL_PORT 0x38 | |
49 | #define CRVML_LVDS_ON 0x00000001 | |
50 | #define CRVML_PANEL_ON 0x00000002 | |
51 | #define CRVML_BACKLIGHT_OFF 0x00000004 | |
52 | ||
53 | /* The PLL Clock register sits on Host bridge */ | |
54 | #define CRVML_DEVICE_MCH 0x5001 | |
55 | #define CRVML_REG_MCHBAR 0x44 | |
56 | #define CRVML_REG_MCHEN 0x54 | |
57 | #define CRVML_MCHEN_BIT (1 << 28) | |
58 | #define CRVML_MCHMAP_SIZE 4096 | |
59 | #define CRVML_REG_CLOCK 0xc3c | |
60 | #define CRVML_CLOCK_SHIFT 8 | |
61 | #define CRVML_CLOCK_MASK 0x00000f00 | |
62 | ||
63 | static struct pci_dev *lpc_dev; | |
64 | static u32 gpio_bar; | |
65 | ||
66 | struct cr_panel { | |
67 | struct backlight_device *cr_backlight_device; | |
68 | struct lcd_device *cr_lcd_device; | |
69 | }; | |
70 | ||
71 | static int cr_backlight_set_intensity(struct backlight_device *bd) | |
72 | { | |
73 | int intensity = bd->props.brightness; | |
74 | u32 addr = gpio_bar + CRVML_PANEL_PORT; | |
75 | u32 cur = inl(addr); | |
76 | ||
77 | if (bd->props.power == FB_BLANK_UNBLANK) | |
78 | intensity = FB_BLANK_UNBLANK; | |
79 | if (bd->props.fb_blank == FB_BLANK_UNBLANK) | |
80 | intensity = FB_BLANK_UNBLANK; | |
81 | if (bd->props.power == FB_BLANK_POWERDOWN) | |
82 | intensity = FB_BLANK_POWERDOWN; | |
83 | if (bd->props.fb_blank == FB_BLANK_POWERDOWN) | |
84 | intensity = FB_BLANK_POWERDOWN; | |
85 | ||
86 | if (intensity == FB_BLANK_UNBLANK) { /* FULL ON */ | |
87 | cur &= ~CRVML_BACKLIGHT_OFF; | |
88 | outl(cur, addr); | |
89 | } else if (intensity == FB_BLANK_POWERDOWN) { /* OFF */ | |
90 | cur |= CRVML_BACKLIGHT_OFF; | |
91 | outl(cur, addr); | |
92 | } /* anything else, don't bother */ | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | static int cr_backlight_get_intensity(struct backlight_device *bd) | |
98 | { | |
99 | u32 addr = gpio_bar + CRVML_PANEL_PORT; | |
100 | u32 cur = inl(addr); | |
101 | u8 intensity; | |
102 | ||
103 | if (cur & CRVML_BACKLIGHT_OFF) | |
104 | intensity = FB_BLANK_POWERDOWN; | |
105 | else | |
106 | intensity = FB_BLANK_UNBLANK; | |
107 | ||
108 | return intensity; | |
109 | } | |
110 | ||
111 | static struct backlight_ops cr_backlight_ops = { | |
112 | .get_brightness = cr_backlight_get_intensity, | |
113 | .update_status = cr_backlight_set_intensity, | |
114 | }; | |
115 | ||
116 | static void cr_panel_on(void) | |
117 | { | |
118 | u32 addr = gpio_bar + CRVML_PANEL_PORT; | |
119 | u32 cur = inl(addr); | |
120 | ||
121 | if (!(cur & CRVML_PANEL_ON)) { | |
122 | /* Make sure LVDS controller is down. */ | |
123 | if (cur & 0x00000001) { | |
124 | cur &= ~CRVML_LVDS_ON; | |
125 | outl(cur, addr); | |
126 | } | |
127 | /* Power up Panel */ | |
128 | schedule_timeout(HZ / 10); | |
129 | cur |= CRVML_PANEL_ON; | |
130 | outl(cur, addr); | |
131 | } | |
132 | ||
133 | /* Power up LVDS controller */ | |
134 | ||
135 | if (!(cur & CRVML_LVDS_ON)) { | |
136 | schedule_timeout(HZ / 10); | |
137 | outl(cur | CRVML_LVDS_ON, addr); | |
138 | } | |
139 | } | |
140 | ||
141 | static void cr_panel_off(void) | |
142 | { | |
143 | u32 addr = gpio_bar + CRVML_PANEL_PORT; | |
144 | u32 cur = inl(addr); | |
145 | ||
146 | /* Power down LVDS controller first to avoid high currents */ | |
147 | if (cur & CRVML_LVDS_ON) { | |
148 | cur &= ~CRVML_LVDS_ON; | |
149 | outl(cur, addr); | |
150 | } | |
151 | if (cur & CRVML_PANEL_ON) { | |
152 | schedule_timeout(HZ / 10); | |
153 | outl(cur & ~CRVML_PANEL_ON, addr); | |
154 | } | |
155 | } | |
156 | ||
157 | static int cr_lcd_set_power(struct lcd_device *ld, int power) | |
158 | { | |
159 | if (power == FB_BLANK_UNBLANK) | |
160 | cr_panel_on(); | |
161 | if (power == FB_BLANK_POWERDOWN) | |
162 | cr_panel_off(); | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | static struct lcd_ops cr_lcd_ops = { | |
168 | .set_power = cr_lcd_set_power, | |
169 | }; | |
170 | ||
171 | static int cr_backlight_probe(struct platform_device *pdev) | |
172 | { | |
0b75f2df JJ |
173 | struct backlight_device *bdp; |
174 | struct lcd_device *ldp; | |
dbe7e429 AH |
175 | struct cr_panel *crp; |
176 | u8 dev_en; | |
177 | ||
dbe7e429 AH |
178 | lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL, |
179 | CRVML_DEVICE_LPC, NULL); | |
180 | if (!lpc_dev) { | |
181 | printk("INTEL CARILLO RANCH LPC not found.\n"); | |
182 | return -ENODEV; | |
183 | } | |
184 | ||
185 | pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en); | |
186 | if (!(dev_en & CRVML_GPIOEN_BIT)) { | |
187 | printk(KERN_ERR | |
188 | "Carillo Ranch GPIO device was not enabled.\n"); | |
189 | pci_dev_put(lpc_dev); | |
190 | return -ENODEV; | |
191 | } | |
192 | ||
0b75f2df JJ |
193 | bdp = backlight_device_register("cr-backlight", |
194 | &pdev->dev, NULL, &cr_backlight_ops); | |
195 | if (IS_ERR(bdp)) { | |
dbe7e429 | 196 | pci_dev_put(lpc_dev); |
0b75f2df | 197 | return PTR_ERR(bdp); |
dbe7e429 AH |
198 | } |
199 | ||
0b75f2df JJ |
200 | ldp = lcd_device_register("cr-lcd", &pdev->dev, NULL, &cr_lcd_ops); |
201 | if (IS_ERR(ldp)) { | |
202 | backlight_device_unregister(bdp); | |
dbe7e429 | 203 | pci_dev_put(lpc_dev); |
0b75f2df | 204 | return PTR_ERR(bdp); |
dbe7e429 AH |
205 | } |
206 | ||
207 | pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR, | |
208 | &gpio_bar); | |
209 | gpio_bar &= ~0x3F; | |
210 | ||
0b75f2df JJ |
211 | crp = kzalloc(sizeof(*crp), GFP_KERNEL); |
212 | if (!crp) { | |
213 | lcd_device_unregister(ldp); | |
214 | backlight_device_unregister(bdp); | |
215 | pci_dev_put(lpc_dev); | |
216 | return -ENOMEM; | |
217 | } | |
218 | ||
219 | crp->cr_backlight_device = bdp; | |
220 | crp->cr_lcd_device = ldp; | |
dbe7e429 AH |
221 | crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK; |
222 | crp->cr_backlight_device->props.brightness = 0; | |
223 | crp->cr_backlight_device->props.max_brightness = 0; | |
224 | cr_backlight_set_intensity(crp->cr_backlight_device); | |
225 | ||
226 | cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK); | |
227 | ||
228 | platform_set_drvdata(pdev, crp); | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | static int cr_backlight_remove(struct platform_device *pdev) | |
234 | { | |
235 | struct cr_panel *crp = platform_get_drvdata(pdev); | |
236 | crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN; | |
237 | crp->cr_backlight_device->props.brightness = 0; | |
238 | crp->cr_backlight_device->props.max_brightness = 0; | |
239 | cr_backlight_set_intensity(crp->cr_backlight_device); | |
240 | cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN); | |
241 | backlight_device_unregister(crp->cr_backlight_device); | |
242 | lcd_device_unregister(crp->cr_lcd_device); | |
243 | pci_dev_put(lpc_dev); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | static 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 | ||
256 | static struct platform_device *crp; | |
257 | ||
258 | static int __init cr_backlight_init(void) | |
259 | { | |
260 | int ret = platform_driver_register(&cr_backlight_driver); | |
261 | ||
262 | if (!ret) { | |
263 | crp = platform_device_alloc("cr_backlight", -1); | |
264 | if (!crp) | |
265 | return -ENOMEM; | |
266 | ||
267 | ret = platform_device_add(crp); | |
268 | ||
269 | if (ret) { | |
270 | platform_device_put(crp); | |
271 | platform_driver_unregister(&cr_backlight_driver); | |
272 | } | |
273 | } | |
274 | ||
275 | printk("Carillo Ranch Backlight Driver Initialized.\n"); | |
276 | ||
277 | return ret; | |
278 | } | |
279 | ||
280 | static void __exit cr_backlight_exit(void) | |
281 | { | |
282 | platform_device_unregister(crp); | |
283 | platform_driver_unregister(&cr_backlight_driver); | |
284 | } | |
285 | ||
286 | module_init(cr_backlight_init); | |
287 | module_exit(cr_backlight_exit); | |
288 | ||
289 | MODULE_AUTHOR("Tungsten Graphics Inc."); | |
290 | MODULE_DESCRIPTION("Carillo Ranch Backlight Driver"); | |
291 | MODULE_LICENSE("GPL"); |