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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 | ||
31e6432b JH |
30 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
31 | ||
dbe7e429 AH |
32 | #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> | |
5a0e3ad6 | 41 | #include <linux/slab.h> |
dbe7e429 AH |
42 | |
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 | ||
66 | static struct pci_dev *lpc_dev; | |
67 | static u32 gpio_bar; | |
68 | ||
69 | struct cr_panel { | |
70 | struct backlight_device *cr_backlight_device; | |
71 | struct lcd_device *cr_lcd_device; | |
72 | }; | |
73 | ||
74 | static 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 | ||
100 | static 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 | ||
9905a43b | 114 | static const struct backlight_ops cr_backlight_ops = { |
dbe7e429 AH |
115 | .get_brightness = cr_backlight_get_intensity, |
116 | .update_status = cr_backlight_set_intensity, | |
117 | }; | |
118 | ||
119 | static 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 | ||
144 | static 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 | ||
160 | static 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 | ||
170 | static struct lcd_ops cr_lcd_ops = { | |
171 | .set_power = cr_lcd_set_power, | |
172 | }; | |
173 | ||
174 | static int cr_backlight_probe(struct platform_device *pdev) | |
175 | { | |
a19a6ee6 | 176 | struct backlight_properties props; |
0b75f2df JJ |
177 | struct backlight_device *bdp; |
178 | struct lcd_device *ldp; | |
dbe7e429 AH |
179 | struct cr_panel *crp; |
180 | u8 dev_en; | |
181 | ||
dbe7e429 AH |
182 | lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL, |
183 | CRVML_DEVICE_LPC, NULL); | |
184 | if (!lpc_dev) { | |
31e6432b | 185 | pr_err("INTEL CARILLO RANCH LPC not found.\n"); |
dbe7e429 AH |
186 | return -ENODEV; |
187 | } | |
188 | ||
189 | pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en); | |
190 | if (!(dev_en & CRVML_GPIOEN_BIT)) { | |
31e6432b | 191 | pr_err("Carillo Ranch GPIO device was not enabled.\n"); |
dbe7e429 AH |
192 | pci_dev_put(lpc_dev); |
193 | return -ENODEV; | |
194 | } | |
195 | ||
a19a6ee6 | 196 | memset(&props, 0, sizeof(struct backlight_properties)); |
bb7ca747 | 197 | props.type = BACKLIGHT_RAW; |
289a65e4 JH |
198 | bdp = devm_backlight_device_register(&pdev->dev, "cr-backlight", |
199 | &pdev->dev, NULL, &cr_backlight_ops, | |
200 | &props); | |
0b75f2df | 201 | if (IS_ERR(bdp)) { |
dbe7e429 | 202 | pci_dev_put(lpc_dev); |
0b75f2df | 203 | return PTR_ERR(bdp); |
dbe7e429 AH |
204 | } |
205 | ||
289a65e4 JH |
206 | ldp = devm_lcd_device_register(&pdev->dev, "cr-lcd", &pdev->dev, NULL, |
207 | &cr_lcd_ops); | |
0b75f2df | 208 | if (IS_ERR(ldp)) { |
dbe7e429 | 209 | pci_dev_put(lpc_dev); |
5b0582ea | 210 | return PTR_ERR(ldp); |
dbe7e429 AH |
211 | } |
212 | ||
213 | pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR, | |
214 | &gpio_bar); | |
215 | gpio_bar &= ~0x3F; | |
216 | ||
ce969228 | 217 | crp = devm_kzalloc(&pdev->dev, sizeof(*crp), GFP_KERNEL); |
0b75f2df | 218 | if (!crp) { |
0b75f2df JJ |
219 | pci_dev_put(lpc_dev); |
220 | return -ENOMEM; | |
221 | } | |
222 | ||
223 | crp->cr_backlight_device = bdp; | |
224 | crp->cr_lcd_device = ldp; | |
dbe7e429 AH |
225 | crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK; |
226 | crp->cr_backlight_device->props.brightness = 0; | |
dbe7e429 | 227 | cr_backlight_set_intensity(crp->cr_backlight_device); |
dbe7e429 AH |
228 | cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK); |
229 | ||
230 | platform_set_drvdata(pdev, crp); | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static 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); | |
dbe7e429 AH |
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 | ||
b4a11d3d AM |
262 | if (ret) |
263 | return ret; | |
dbe7e429 | 264 | |
b4a11d3d AM |
265 | 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); | |
dbe7e429 AH |
269 | } |
270 | ||
31e6432b | 271 | pr_info("Carillo Ranch Backlight Driver Initialized.\n"); |
dbe7e429 | 272 | |
b4a11d3d | 273 | return 0; |
dbe7e429 AH |
274 | } |
275 | ||
276 | static void __exit cr_backlight_exit(void) | |
277 | { | |
278 | platform_device_unregister(crp); | |
279 | platform_driver_unregister(&cr_backlight_driver); | |
280 | } | |
281 | ||
282 | module_init(cr_backlight_init); | |
283 | module_exit(cr_backlight_exit); | |
284 | ||
285 | MODULE_AUTHOR("Tungsten Graphics Inc."); | |
286 | MODULE_DESCRIPTION("Carillo Ranch Backlight Driver"); | |
287 | MODULE_LICENSE("GPL"); |