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19#include <linux/module.h>
20#include <linux/kernel.h>
21#include <linux/init.h>
22#include <linux/platform_device.h>
23#include <linux/backlight.h>
24#include <linux/err.h>
25#include <linux/dmi.h>
26#include <linux/io.h>
27
28static struct backlight_device *mbp_backlight_device;
29
30
31struct dmi_match_data {
32
33 unsigned long iostart;
34 unsigned long iolen;
35
36 struct backlight_ops backlight_ops;
37};
38
39
40static int debug;
41module_param_named(debug, debug, int, 0644);
42MODULE_PARM_DESC(debug, "Set to one to enable debugging messages.");
43
44
45
46
47static int intel_chipset_send_intensity(struct backlight_device *bd)
48{
49 int intensity = bd->props.brightness;
50
51 if (debug)
52 printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n",
53 intensity);
54
55 outb(0x04 | (intensity << 4), 0xb3);
56 outb(0xbf, 0xb2);
57 return 0;
58}
59
60static int intel_chipset_get_intensity(struct backlight_device *bd)
61{
62 int intensity;
63
64 outb(0x03, 0xb3);
65 outb(0xbf, 0xb2);
66 intensity = inb(0xb3) >> 4;
67
68 if (debug)
69 printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n",
70 intensity);
71
72 return intensity;
73}
74
75static const struct dmi_match_data intel_chipset_data = {
76 .iostart = 0xb2,
77 .iolen = 2,
78 .backlight_ops = {
79 .options = BL_CORE_SUSPENDRESUME,
80 .get_brightness = intel_chipset_get_intensity,
81 .update_status = intel_chipset_send_intensity,
82 }
83};
84
85
86
87
88static int nvidia_chipset_send_intensity(struct backlight_device *bd)
89{
90 int intensity = bd->props.brightness;
91
92 if (debug)
93 printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n",
94 intensity);
95
96 outb(0x04 | (intensity << 4), 0x52f);
97 outb(0xbf, 0x52e);
98 return 0;
99}
100
101static int nvidia_chipset_get_intensity(struct backlight_device *bd)
102{
103 int intensity;
104
105 outb(0x03, 0x52f);
106 outb(0xbf, 0x52e);
107 intensity = inb(0x52f) >> 4;
108
109 if (debug)
110 printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n",
111 intensity);
112
113 return intensity;
114}
115
116static const struct dmi_match_data nvidia_chipset_data = {
117 .iostart = 0x52e,
118 .iolen = 2,
119 .backlight_ops = {
120 .options = BL_CORE_SUSPENDRESUME,
121 .get_brightness = nvidia_chipset_get_intensity,
122 .update_status = nvidia_chipset_send_intensity
123 }
124};
125
126
127
128
129static struct dmi_match_data *driver_data;
130
131static int mbp_dmi_match(const struct dmi_system_id *id)
132{
133 driver_data = id->driver_data;
134
135 printk(KERN_INFO "mbp_nvidia_bl: %s detected\n", id->ident);
136 return 1;
137}
138
139static const struct dmi_system_id __initdata mbp_device_table[] = {
140 {
141 .callback = mbp_dmi_match,
142 .ident = "MacBookPro 3,1",
143 .matches = {
144 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
145 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,1"),
146 },
147 .driver_data = (void *)&intel_chipset_data,
148 },
149 {
150 .callback = mbp_dmi_match,
151 .ident = "MacBookPro 3,2",
152 .matches = {
153 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
154 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,2"),
155 },
156 .driver_data = (void *)&intel_chipset_data,
157 },
158 {
159 .callback = mbp_dmi_match,
160 .ident = "MacBookPro 4,1",
161 .matches = {
162 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
163 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro4,1"),
164 },
165 .driver_data = (void *)&intel_chipset_data,
166 },
167 {
168 .callback = mbp_dmi_match,
169 .ident = "MacBookAir 1,1",
170 .matches = {
171 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
172 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir1,1"),
173 },
174 .driver_data = (void *)&intel_chipset_data,
175 },
176 {
177 .callback = mbp_dmi_match,
178 .ident = "MacBook 5,1",
179 .matches = {
180 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
181 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,1"),
182 },
183 .driver_data = (void *)&nvidia_chipset_data,
184 },
185 {
186 .callback = mbp_dmi_match,
187 .ident = "MacBook 5,2",
188 .matches = {
189 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
190 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,2"),
191 },
192 .driver_data = (void *)&nvidia_chipset_data,
193 },
194 {
195 .callback = mbp_dmi_match,
196 .ident = "MacBookAir 2,1",
197 .matches = {
198 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
199 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir2,1"),
200 },
201 .driver_data = (void *)&nvidia_chipset_data,
202 },
203 {
204 .callback = mbp_dmi_match,
205 .ident = "MacBookPro 5,1",
206 .matches = {
207 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
208 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,1"),
209 },
210 .driver_data = (void *)&nvidia_chipset_data,
211 },
212 {
213 .callback = mbp_dmi_match,
214 .ident = "MacBookPro 5,2",
215 .matches = {
216 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
217 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,2"),
218 },
219 .driver_data = (void *)&nvidia_chipset_data,
220 },
221 {
222 .callback = mbp_dmi_match,
223 .ident = "MacBookPro 5,5",
224 .matches = {
225 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
226 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,5"),
227 },
228 .driver_data = (void *)&nvidia_chipset_data,
229 },
230 { }
231};
232
233static int __init mbp_init(void)
234{
235 if (!dmi_check_system(mbp_device_table))
236 return -ENODEV;
237
238 if (!request_region(driver_data->iostart, driver_data->iolen,
239 "Macbook Pro backlight"))
240 return -ENXIO;
241
242 mbp_backlight_device = backlight_device_register("mbp_backlight",
243 NULL, NULL, &driver_data->backlight_ops);
244 if (IS_ERR(mbp_backlight_device)) {
245 release_region(driver_data->iostart, driver_data->iolen);
246 return PTR_ERR(mbp_backlight_device);
247 }
248
249 mbp_backlight_device->props.max_brightness = 15;
250 mbp_backlight_device->props.brightness =
251 driver_data->backlight_ops.get_brightness(mbp_backlight_device);
252 backlight_update_status(mbp_backlight_device);
253
254 return 0;
255}
256
257static void __exit mbp_exit(void)
258{
259 backlight_device_unregister(mbp_backlight_device);
260
261 release_region(driver_data->iostart, driver_data->iolen);
262}
263
264module_init(mbp_init);
265module_exit(mbp_exit);
266
267MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
268MODULE_DESCRIPTION("Nvidia-based Macbook Pro Backlight Driver");
269MODULE_LICENSE("GPL");
270MODULE_DEVICE_TABLE(dmi, mbp_device_table);
271
