1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Gmux driver for Apple laptops |
4 | * |
5 | * Copyright (C) Canonical Ltd. <seth.forshee@canonical.com> |
6 | * Copyright (C) 2010-2012 Andreas Heider <andreas@meetr.de> |
7 | * Copyright (C) 2015 Lukas Wunner <lukas@wunner.de> |
8 | * Copyright (C) 2023 Orlando Chamberlain <orlandoch.dev@gmail.com> |
9 | */ |
10 | |
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
12 | |
13 | #include <linux/module.h> |
14 | #include <linux/kernel.h> |
15 | #include <linux/init.h> |
16 | #include <linux/backlight.h> |
17 | #include <linux/acpi.h> |
18 | #include <linux/pnp.h> |
19 | #include <linux/apple-gmux.h> |
20 | #include <linux/slab.h> |
21 | #include <linux/delay.h> |
22 | #include <linux/pci.h> |
23 | #include <linux/vga_switcheroo.h> |
24 | #include <linux/debugfs.h> |
25 | #include <acpi/video.h> |
26 | #include <asm/io.h> |
27 | |
28 | /** |
29 | * DOC: Overview |
30 | * |
31 | * gmux is a microcontroller built into the MacBook Pro to support dual GPUs: |
32 | * A `Lattice XP2`_ on pre-retinas, a `Renesas R4F2113`_ on pre-T2 retinas. |
33 | * |
34 | * On T2 Macbooks, the gmux is part of the T2 Coprocessor's SMC. The SMC has |
35 | * an I2C connection to a `NXP PCAL6524` GPIO expander, which enables/disables |
36 | * the voltage regulators of the discrete GPU, drives the display panel power, |
37 | * and has a GPIO to switch the eDP mux. The Intel CPU can interact with |
38 | * gmux through MMIO, similar to how the main SMC interface is controlled. |
39 | * |
40 | * (The MacPro6,1 2013 also has a gmux, however it is unclear why since it has |
41 | * dual GPUs but no built-in display.) |
42 | * |
43 | * gmux is connected to the LPC bus of the southbridge. Its I/O ports are |
44 | * accessed differently depending on the microcontroller: Driver functions |
45 | * to access a pre-retina gmux are infixed ``_pio_``, those for a pre-T2 |
46 | * retina gmux are infixed ``_index_``, and those on T2 Macs are infixed |
47 | * with ``_mmio_``. |
48 | * |
49 | * .. _Lattice XP2: |
50 | * http://www.latticesemi.com/en/Products/FPGAandCPLD/LatticeXP2.aspx |
51 | * .. _Renesas R4F2113: |
52 | * http://www.renesas.com/products/mpumcu/h8s/h8s2100/h8s2113/index.jsp |
53 | * .. _NXP PCAL6524: |
54 | * https://www.nxp.com/docs/en/data-sheet/PCAL6524.pdf |
55 | */ |
56 | |
57 | struct apple_gmux_config; |
58 | |
59 | struct apple_gmux_data { |
60 | u8 __iomem *iomem_base; |
61 | unsigned long iostart; |
62 | unsigned long iolen; |
63 | const struct apple_gmux_config *config; |
64 | struct mutex index_lock; |
65 | |
66 | struct backlight_device *bdev; |
67 | |
68 | /* switcheroo data */ |
69 | acpi_handle dhandle; |
70 | int gpe; |
71 | bool external_switchable; |
72 | enum vga_switcheroo_client_id switch_state_display; |
73 | enum vga_switcheroo_client_id switch_state_ddc; |
74 | enum vga_switcheroo_client_id switch_state_external; |
75 | enum vga_switcheroo_state power_state; |
76 | struct completion powerchange_done; |
77 | |
78 | /* debugfs data */ |
79 | u8 selected_port; |
80 | struct dentry *debug_dentry; |
81 | }; |
82 | |
83 | static struct apple_gmux_data *apple_gmux_data; |
84 | |
85 | struct apple_gmux_config { |
86 | u8 (*read8)(struct apple_gmux_data *gmux_data, int port); |
87 | void (*write8)(struct apple_gmux_data *gmux_data, int port, u8 val); |
88 | u32 (*read32)(struct apple_gmux_data *gmux_data, int port); |
89 | void (*write32)(struct apple_gmux_data *gmux_data, int port, u32 val); |
90 | const struct vga_switcheroo_handler *gmux_handler; |
91 | enum vga_switcheroo_handler_flags_t handler_flags; |
92 | unsigned long resource_type; |
93 | bool read_version_as_u32; |
94 | char *name; |
95 | }; |
96 | |
97 | #define GMUX_INTERRUPT_ENABLE 0xff |
98 | #define GMUX_INTERRUPT_DISABLE 0x00 |
99 | |
100 | #define GMUX_INTERRUPT_STATUS_ACTIVE 0 |
101 | #define GMUX_INTERRUPT_STATUS_DISPLAY (1 << 0) |
102 | #define GMUX_INTERRUPT_STATUS_POWER (1 << 2) |
103 | #define GMUX_INTERRUPT_STATUS_HOTPLUG (1 << 3) |
104 | |
105 | #define GMUX_BRIGHTNESS_MASK 0x00ffffff |
106 | #define GMUX_MAX_BRIGHTNESS GMUX_BRIGHTNESS_MASK |
107 | |
108 | # define MMIO_GMUX_MAX_BRIGHTNESS 0xffff |
109 | |
110 | static u8 gmux_pio_read8(struct apple_gmux_data *gmux_data, int port) |
111 | { |
112 | return inb(port: gmux_data->iostart + port); |
113 | } |
114 | |
115 | static void gmux_pio_write8(struct apple_gmux_data *gmux_data, int port, |
116 | u8 val) |
117 | { |
118 | outb(value: val, port: gmux_data->iostart + port); |
119 | } |
120 | |
121 | static u32 gmux_pio_read32(struct apple_gmux_data *gmux_data, int port) |
122 | { |
123 | return inl(port: gmux_data->iostart + port); |
124 | } |
125 | |
126 | static void gmux_pio_write32(struct apple_gmux_data *gmux_data, int port, |
127 | u32 val) |
128 | { |
129 | int i; |
130 | u8 tmpval; |
131 | |
132 | for (i = 0; i < 4; i++) { |
133 | tmpval = (val >> (i * 8)) & 0xff; |
134 | outb(value: tmpval, port: gmux_data->iostart + port + i); |
135 | } |
136 | } |
137 | |
138 | static int gmux_index_wait_ready(struct apple_gmux_data *gmux_data) |
139 | { |
140 | int i = 200; |
141 | u8 gwr = inb(port: gmux_data->iostart + GMUX_PORT_WRITE); |
142 | |
143 | while (i && (gwr & 0x01)) { |
144 | inb(port: gmux_data->iostart + GMUX_PORT_READ); |
145 | gwr = inb(port: gmux_data->iostart + GMUX_PORT_WRITE); |
146 | udelay(100); |
147 | i--; |
148 | } |
149 | |
150 | return !!i; |
151 | } |
152 | |
153 | static int gmux_index_wait_complete(struct apple_gmux_data *gmux_data) |
154 | { |
155 | int i = 200; |
156 | u8 gwr = inb(port: gmux_data->iostart + GMUX_PORT_WRITE); |
157 | |
158 | while (i && !(gwr & 0x01)) { |
159 | gwr = inb(port: gmux_data->iostart + GMUX_PORT_WRITE); |
160 | udelay(100); |
161 | i--; |
162 | } |
163 | |
164 | if (gwr & 0x01) |
165 | inb(port: gmux_data->iostart + GMUX_PORT_READ); |
166 | |
167 | return !!i; |
168 | } |
169 | |
170 | static u8 gmux_index_read8(struct apple_gmux_data *gmux_data, int port) |
171 | { |
172 | u8 val; |
173 | |
174 | mutex_lock(&gmux_data->index_lock); |
175 | gmux_index_wait_ready(gmux_data); |
176 | outb(value: (port & 0xff), port: gmux_data->iostart + GMUX_PORT_READ); |
177 | gmux_index_wait_complete(gmux_data); |
178 | val = inb(port: gmux_data->iostart + GMUX_PORT_VALUE); |
179 | mutex_unlock(lock: &gmux_data->index_lock); |
180 | |
181 | return val; |
182 | } |
183 | |
184 | static void gmux_index_write8(struct apple_gmux_data *gmux_data, int port, |
185 | u8 val) |
186 | { |
187 | mutex_lock(&gmux_data->index_lock); |
188 | outb(value: val, port: gmux_data->iostart + GMUX_PORT_VALUE); |
189 | gmux_index_wait_ready(gmux_data); |
190 | outb(value: port & 0xff, port: gmux_data->iostart + GMUX_PORT_WRITE); |
191 | gmux_index_wait_complete(gmux_data); |
192 | mutex_unlock(lock: &gmux_data->index_lock); |
193 | } |
194 | |
195 | static u32 gmux_index_read32(struct apple_gmux_data *gmux_data, int port) |
196 | { |
197 | u32 val; |
198 | |
199 | mutex_lock(&gmux_data->index_lock); |
200 | gmux_index_wait_ready(gmux_data); |
201 | outb(value: (port & 0xff), port: gmux_data->iostart + GMUX_PORT_READ); |
202 | gmux_index_wait_complete(gmux_data); |
203 | val = inl(port: gmux_data->iostart + GMUX_PORT_VALUE); |
204 | mutex_unlock(lock: &gmux_data->index_lock); |
205 | |
206 | return val; |
207 | } |
208 | |
209 | static void gmux_index_write32(struct apple_gmux_data *gmux_data, int port, |
210 | u32 val) |
211 | { |
212 | int i; |
213 | u8 tmpval; |
214 | |
215 | mutex_lock(&gmux_data->index_lock); |
216 | |
217 | for (i = 0; i < 4; i++) { |
218 | tmpval = (val >> (i * 8)) & 0xff; |
219 | outb(value: tmpval, port: gmux_data->iostart + GMUX_PORT_VALUE + i); |
220 | } |
221 | |
222 | gmux_index_wait_ready(gmux_data); |
223 | outb(value: port & 0xff, port: gmux_data->iostart + GMUX_PORT_WRITE); |
224 | gmux_index_wait_complete(gmux_data); |
225 | mutex_unlock(lock: &gmux_data->index_lock); |
226 | } |
227 | |
228 | static int gmux_mmio_wait(struct apple_gmux_data *gmux_data) |
229 | { |
230 | int i = 200; |
231 | u8 gwr = ioread8(gmux_data->iomem_base + GMUX_MMIO_COMMAND_SEND); |
232 | |
233 | while (i && gwr) { |
234 | gwr = ioread8(gmux_data->iomem_base + GMUX_MMIO_COMMAND_SEND); |
235 | udelay(100); |
236 | i--; |
237 | } |
238 | |
239 | return !!i; |
240 | } |
241 | |
242 | static u8 gmux_mmio_read8(struct apple_gmux_data *gmux_data, int port) |
243 | { |
244 | u8 val; |
245 | |
246 | mutex_lock(&gmux_data->index_lock); |
247 | gmux_mmio_wait(gmux_data); |
248 | iowrite8((port & 0xff), gmux_data->iomem_base + GMUX_MMIO_PORT_SELECT); |
249 | iowrite8(GMUX_MMIO_READ | sizeof(val), |
250 | gmux_data->iomem_base + GMUX_MMIO_COMMAND_SEND); |
251 | gmux_mmio_wait(gmux_data); |
252 | val = ioread8(gmux_data->iomem_base); |
253 | mutex_unlock(lock: &gmux_data->index_lock); |
254 | |
255 | return val; |
256 | } |
257 | |
258 | static void gmux_mmio_write8(struct apple_gmux_data *gmux_data, int port, |
259 | u8 val) |
260 | { |
261 | mutex_lock(&gmux_data->index_lock); |
262 | gmux_mmio_wait(gmux_data); |
263 | iowrite8(val, gmux_data->iomem_base); |
264 | |
265 | iowrite8(port & 0xff, gmux_data->iomem_base + GMUX_MMIO_PORT_SELECT); |
266 | iowrite8(GMUX_MMIO_WRITE | sizeof(val), |
267 | gmux_data->iomem_base + GMUX_MMIO_COMMAND_SEND); |
268 | |
269 | gmux_mmio_wait(gmux_data); |
270 | mutex_unlock(lock: &gmux_data->index_lock); |
271 | } |
272 | |
273 | static u32 gmux_mmio_read32(struct apple_gmux_data *gmux_data, int port) |
274 | { |
275 | u32 val; |
276 | |
277 | mutex_lock(&gmux_data->index_lock); |
278 | gmux_mmio_wait(gmux_data); |
279 | iowrite8((port & 0xff), gmux_data->iomem_base + GMUX_MMIO_PORT_SELECT); |
280 | iowrite8(GMUX_MMIO_READ | sizeof(val), |
281 | gmux_data->iomem_base + GMUX_MMIO_COMMAND_SEND); |
282 | gmux_mmio_wait(gmux_data); |
283 | val = ioread32be(gmux_data->iomem_base); |
284 | mutex_unlock(lock: &gmux_data->index_lock); |
285 | |
286 | return val; |
287 | } |
288 | |
289 | static void gmux_mmio_write32(struct apple_gmux_data *gmux_data, int port, |
290 | u32 val) |
291 | { |
292 | mutex_lock(&gmux_data->index_lock); |
293 | iowrite32be(val, gmux_data->iomem_base); |
294 | iowrite8(port & 0xff, gmux_data->iomem_base + GMUX_MMIO_PORT_SELECT); |
295 | iowrite8(GMUX_MMIO_WRITE | sizeof(val), |
296 | gmux_data->iomem_base + GMUX_MMIO_COMMAND_SEND); |
297 | gmux_mmio_wait(gmux_data); |
298 | mutex_unlock(lock: &gmux_data->index_lock); |
299 | } |
300 | |
301 | static u8 gmux_read8(struct apple_gmux_data *gmux_data, int port) |
302 | { |
303 | return gmux_data->config->read8(gmux_data, port); |
304 | } |
305 | |
306 | static void gmux_write8(struct apple_gmux_data *gmux_data, int port, u8 val) |
307 | { |
308 | return gmux_data->config->write8(gmux_data, port, val); |
309 | } |
310 | |
311 | static u32 gmux_read32(struct apple_gmux_data *gmux_data, int port) |
312 | { |
313 | return gmux_data->config->read32(gmux_data, port); |
314 | } |
315 | |
316 | static void gmux_write32(struct apple_gmux_data *gmux_data, int port, |
317 | u32 val) |
318 | { |
319 | return gmux_data->config->write32(gmux_data, port, val); |
320 | } |
321 | |
322 | /** |
323 | * DOC: Backlight control |
324 | * |
325 | * On single GPU MacBooks, the PWM signal for the backlight is generated by |
326 | * the GPU. On dual GPU MacBook Pros by contrast, either GPU may be suspended |
327 | * to conserve energy. Hence the PWM signal needs to be generated by a separate |
328 | * backlight driver which is controlled by gmux. The earliest generation |
329 | * MBP5 2008/09 uses a `TI LP8543`_ backlight driver. Newer models |
330 | * use a `TI LP8545`_ or a TI LP8548. |
331 | * |
332 | * .. _TI LP8543: https://www.ti.com/lit/ds/symlink/lp8543.pdf |
333 | * .. _TI LP8545: https://www.ti.com/lit/ds/symlink/lp8545.pdf |
334 | */ |
335 | |
336 | static int gmux_get_brightness(struct backlight_device *bd) |
337 | { |
338 | struct apple_gmux_data *gmux_data = bl_get_data(bl_dev: bd); |
339 | return gmux_read32(gmux_data, GMUX_PORT_BRIGHTNESS) & |
340 | GMUX_BRIGHTNESS_MASK; |
341 | } |
342 | |
343 | static int gmux_update_status(struct backlight_device *bd) |
344 | { |
345 | struct apple_gmux_data *gmux_data = bl_get_data(bl_dev: bd); |
346 | u32 brightness = backlight_get_brightness(bd); |
347 | |
348 | gmux_write32(gmux_data, GMUX_PORT_BRIGHTNESS, val: brightness); |
349 | |
350 | return 0; |
351 | } |
352 | |
353 | static const struct backlight_ops gmux_bl_ops = { |
354 | .options = BL_CORE_SUSPENDRESUME, |
355 | .get_brightness = gmux_get_brightness, |
356 | .update_status = gmux_update_status, |
357 | }; |
358 | |
359 | /** |
360 | * DOC: Graphics mux |
361 | * |
362 | * On pre-retinas, the LVDS outputs of both GPUs feed into gmux which muxes |
363 | * either of them to the panel. One of the tricks gmux has up its sleeve is |
364 | * to lengthen the blanking interval of its output during a switch to |
365 | * synchronize it with the GPU switched to. This allows for a flicker-free |
366 | * switch that is imperceptible by the user (`US 8,687,007 B2`_). |
367 | * |
368 | * On retinas, muxing is no longer done by gmux itself, but by a separate |
369 | * chip which is controlled by gmux. The chip is triple sourced, it is |
370 | * either an `NXP CBTL06142`_, `TI HD3SS212`_ or `Pericom PI3VDP12412`_. |
371 | * The panel is driven with eDP instead of LVDS since the pixel clock |
372 | * required for retina resolution exceeds LVDS' limits. |
373 | * |
374 | * Pre-retinas are able to switch the panel's DDC pins separately. |
375 | * This is handled by a `TI SN74LV4066A`_ which is controlled by gmux. |
376 | * The inactive GPU can thus probe the panel's EDID without switching over |
377 | * the entire panel. Retinas lack this functionality as the chips used for |
378 | * eDP muxing are incapable of switching the AUX channel separately (see |
379 | * the linked data sheets, Pericom would be capable but this is unused). |
380 | * However the retina panel has the NO_AUX_HANDSHAKE_LINK_TRAINING bit set |
381 | * in its DPCD, allowing the inactive GPU to skip the AUX handshake and |
382 | * set up the output with link parameters pre-calibrated by the active GPU. |
383 | * |
384 | * The external DP port is only fully switchable on the first two unibody |
385 | * MacBook Pro generations, MBP5 2008/09 and MBP6 2010. This is done by an |
386 | * `NXP CBTL06141`_ which is controlled by gmux. It's the predecessor of the |
387 | * eDP mux on retinas, the difference being support for 2.7 versus 5.4 Gbit/s. |
388 | * |
389 | * The following MacBook Pro generations replaced the external DP port with a |
390 | * combined DP/Thunderbolt port and lost the ability to switch it between GPUs, |
391 | * connecting it either to the discrete GPU or the Thunderbolt controller. |
392 | * Oddly enough, while the full port is no longer switchable, AUX and HPD |
393 | * are still switchable by way of an `NXP CBTL03062`_ (on pre-retinas |
394 | * MBP8 2011 and MBP9 2012) or two `TI TS3DS10224`_ (on pre-t2 retinas) under |
395 | * the control of gmux. Since the integrated GPU is missing the main link, |
396 | * external displays appear to it as phantoms which fail to link-train. |
397 | * |
398 | * gmux receives the HPD signal of all display connectors and sends an |
399 | * interrupt on hotplug. On generations which cannot switch external ports, |
400 | * the discrete GPU can then be woken to drive the newly connected display. |
401 | * The ability to switch AUX on these generations could be used to improve |
402 | * reliability of hotplug detection by having the integrated GPU poll the |
403 | * ports while the discrete GPU is asleep, but currently we do not make use |
404 | * of this feature. |
405 | * |
406 | * Our switching policy for the external port is that on those generations |
407 | * which are able to switch it fully, the port is switched together with the |
408 | * panel when IGD / DIS commands are issued to vga_switcheroo. It is thus |
409 | * possible to drive e.g. a beamer on battery power with the integrated GPU. |
410 | * The user may manually switch to the discrete GPU if more performance is |
411 | * needed. |
412 | * |
413 | * On all newer generations, the external port can only be driven by the |
414 | * discrete GPU. If a display is plugged in while the panel is switched to |
415 | * the integrated GPU, *both* GPUs will be in use for maximum performance. |
416 | * To decrease power consumption, the user may manually switch to the |
417 | * discrete GPU, thereby suspending the integrated GPU. |
418 | * |
419 | * gmux' initial switch state on bootup is user configurable via the EFI |
420 | * variable ``gpu-power-prefs-fa4ce28d-b62f-4c99-9cc3-6815686e30f9`` (5th byte, |
421 | * 1 = IGD, 0 = DIS). Based on this setting, the EFI firmware tells gmux to |
422 | * switch the panel and the external DP connector and allocates a framebuffer |
423 | * for the selected GPU. |
424 | * |
425 | * .. _US 8,687,007 B2: https://pimg-fpiw.uspto.gov/fdd/07/870/086/0.pdf |
426 | * .. _NXP CBTL06141: https://www.nxp.com/documents/data_sheet/CBTL06141.pdf |
427 | * .. _NXP CBTL06142: https://www.nxp.com/documents/data_sheet/CBTL06141.pdf |
428 | * .. _TI HD3SS212: https://www.ti.com/lit/ds/symlink/hd3ss212.pdf |
429 | * .. _Pericom PI3VDP12412: https://www.pericom.com/assets/Datasheets/PI3VDP12412.pdf |
430 | * .. _TI SN74LV4066A: https://www.ti.com/lit/ds/symlink/sn74lv4066a.pdf |
431 | * .. _NXP CBTL03062: http://pdf.datasheetarchive.com/indexerfiles/Datasheets-SW16/DSASW00308511.pdf |
432 | * .. _TI TS3DS10224: https://www.ti.com/lit/ds/symlink/ts3ds10224.pdf |
433 | */ |
434 | |
435 | static void gmux_read_switch_state(struct apple_gmux_data *gmux_data) |
436 | { |
437 | if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_DDC) == 1) |
438 | gmux_data->switch_state_ddc = VGA_SWITCHEROO_IGD; |
439 | else |
440 | gmux_data->switch_state_ddc = VGA_SWITCHEROO_DIS; |
441 | |
442 | if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_DISPLAY) & 1) |
443 | gmux_data->switch_state_display = VGA_SWITCHEROO_DIS; |
444 | else |
445 | gmux_data->switch_state_display = VGA_SWITCHEROO_IGD; |
446 | |
447 | if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL) == 2) |
448 | gmux_data->switch_state_external = VGA_SWITCHEROO_IGD; |
449 | else |
450 | gmux_data->switch_state_external = VGA_SWITCHEROO_DIS; |
451 | } |
452 | |
453 | static void gmux_write_switch_state(struct apple_gmux_data *gmux_data) |
454 | { |
455 | if (gmux_data->switch_state_ddc == VGA_SWITCHEROO_IGD) |
456 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_DDC, val: 1); |
457 | else |
458 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_DDC, val: 2); |
459 | |
460 | if (gmux_data->switch_state_display == VGA_SWITCHEROO_IGD) |
461 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_DISPLAY, val: 2); |
462 | else |
463 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_DISPLAY, val: 3); |
464 | |
465 | if (gmux_data->switch_state_external == VGA_SWITCHEROO_IGD) |
466 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL, val: 2); |
467 | else |
468 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL, val: 3); |
469 | } |
470 | |
471 | static int gmux_switchto(enum vga_switcheroo_client_id id) |
472 | { |
473 | apple_gmux_data->switch_state_ddc = id; |
474 | apple_gmux_data->switch_state_display = id; |
475 | if (apple_gmux_data->external_switchable) |
476 | apple_gmux_data->switch_state_external = id; |
477 | |
478 | gmux_write_switch_state(gmux_data: apple_gmux_data); |
479 | |
480 | return 0; |
481 | } |
482 | |
483 | static int gmux_switch_ddc(enum vga_switcheroo_client_id id) |
484 | { |
485 | enum vga_switcheroo_client_id old_ddc_owner = |
486 | apple_gmux_data->switch_state_ddc; |
487 | |
488 | if (id == old_ddc_owner) |
489 | return id; |
490 | |
491 | pr_debug("Switching DDC from %d to %d\n" , old_ddc_owner, id); |
492 | apple_gmux_data->switch_state_ddc = id; |
493 | |
494 | if (id == VGA_SWITCHEROO_IGD) |
495 | gmux_write8(gmux_data: apple_gmux_data, GMUX_PORT_SWITCH_DDC, val: 1); |
496 | else |
497 | gmux_write8(gmux_data: apple_gmux_data, GMUX_PORT_SWITCH_DDC, val: 2); |
498 | |
499 | return old_ddc_owner; |
500 | } |
501 | |
502 | /** |
503 | * DOC: Power control |
504 | * |
505 | * gmux is able to cut power to the discrete GPU. It automatically takes care |
506 | * of the correct sequence to tear down and bring up the power rails for |
507 | * core voltage, VRAM and PCIe. |
508 | */ |
509 | |
510 | static int gmux_set_discrete_state(struct apple_gmux_data *gmux_data, |
511 | enum vga_switcheroo_state state) |
512 | { |
513 | reinit_completion(x: &gmux_data->powerchange_done); |
514 | |
515 | if (state == VGA_SWITCHEROO_ON) { |
516 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, val: 1); |
517 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, val: 3); |
518 | pr_debug("Discrete card powered up\n" ); |
519 | } else { |
520 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, val: 1); |
521 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, val: 0); |
522 | pr_debug("Discrete card powered down\n" ); |
523 | } |
524 | |
525 | gmux_data->power_state = state; |
526 | |
527 | if (gmux_data->gpe >= 0 && |
528 | !wait_for_completion_interruptible_timeout(x: &gmux_data->powerchange_done, |
529 | timeout: msecs_to_jiffies(m: 200))) |
530 | pr_warn("Timeout waiting for gmux switch to complete\n" ); |
531 | |
532 | return 0; |
533 | } |
534 | |
535 | static int gmux_set_power_state(enum vga_switcheroo_client_id id, |
536 | enum vga_switcheroo_state state) |
537 | { |
538 | if (id == VGA_SWITCHEROO_IGD) |
539 | return 0; |
540 | |
541 | return gmux_set_discrete_state(gmux_data: apple_gmux_data, state); |
542 | } |
543 | |
544 | static enum vga_switcheroo_client_id gmux_get_client_id(struct pci_dev *pdev) |
545 | { |
546 | /* |
547 | * Early Macbook Pros with switchable graphics use nvidia |
548 | * integrated graphics. Hardcode that the 9400M is integrated. |
549 | */ |
550 | if (pdev->vendor == PCI_VENDOR_ID_INTEL) |
551 | return VGA_SWITCHEROO_IGD; |
552 | else if (pdev->vendor == PCI_VENDOR_ID_NVIDIA && |
553 | pdev->device == 0x0863) |
554 | return VGA_SWITCHEROO_IGD; |
555 | else |
556 | return VGA_SWITCHEROO_DIS; |
557 | } |
558 | |
559 | static const struct vga_switcheroo_handler gmux_handler_no_ddc = { |
560 | .switchto = gmux_switchto, |
561 | .power_state = gmux_set_power_state, |
562 | .get_client_id = gmux_get_client_id, |
563 | }; |
564 | |
565 | static const struct vga_switcheroo_handler gmux_handler_ddc = { |
566 | .switchto = gmux_switchto, |
567 | .switch_ddc = gmux_switch_ddc, |
568 | .power_state = gmux_set_power_state, |
569 | .get_client_id = gmux_get_client_id, |
570 | }; |
571 | |
572 | static const struct apple_gmux_config apple_gmux_pio = { |
573 | .read8 = &gmux_pio_read8, |
574 | .write8 = &gmux_pio_write8, |
575 | .read32 = &gmux_pio_read32, |
576 | .write32 = &gmux_pio_write32, |
577 | .gmux_handler = &gmux_handler_ddc, |
578 | .handler_flags = VGA_SWITCHEROO_CAN_SWITCH_DDC, |
579 | .resource_type = IORESOURCE_IO, |
580 | .read_version_as_u32 = false, |
581 | .name = "classic" |
582 | }; |
583 | |
584 | static const struct apple_gmux_config apple_gmux_index = { |
585 | .read8 = &gmux_index_read8, |
586 | .write8 = &gmux_index_write8, |
587 | .read32 = &gmux_index_read32, |
588 | .write32 = &gmux_index_write32, |
589 | .gmux_handler = &gmux_handler_no_ddc, |
590 | .handler_flags = VGA_SWITCHEROO_NEEDS_EDP_CONFIG, |
591 | .resource_type = IORESOURCE_IO, |
592 | .read_version_as_u32 = true, |
593 | .name = "indexed" |
594 | }; |
595 | |
596 | static const struct apple_gmux_config apple_gmux_mmio = { |
597 | .read8 = &gmux_mmio_read8, |
598 | .write8 = &gmux_mmio_write8, |
599 | .read32 = &gmux_mmio_read32, |
600 | .write32 = &gmux_mmio_write32, |
601 | .gmux_handler = &gmux_handler_no_ddc, |
602 | .handler_flags = VGA_SWITCHEROO_NEEDS_EDP_CONFIG, |
603 | .resource_type = IORESOURCE_MEM, |
604 | .read_version_as_u32 = true, |
605 | .name = "T2" |
606 | }; |
607 | |
608 | |
609 | /** |
610 | * DOC: Interrupt |
611 | * |
612 | * gmux is also connected to a GPIO pin of the southbridge and thereby is able |
613 | * to trigger an ACPI GPE. ACPI name GMGP holds this GPIO pin's number. On the |
614 | * MBP5 2008/09 it's GPIO pin 22 of the Nvidia MCP79, on following generations |
615 | * it's GPIO pin 6 of the Intel PCH, on MMIO gmux's it's pin 21. |
616 | * |
617 | * The GPE merely signals that an interrupt occurred, the actual type of event |
618 | * is identified by reading a gmux register. |
619 | * |
620 | * In addition to the GMGP name, gmux's ACPI device also has two methods GMSP |
621 | * and GMLV. GMLV likely means "GMUX Level", and reads the value of the GPIO, |
622 | * while GMSP likely means "GMUX Set Polarity", and seems to write to the GPIO's |
623 | * value. On newer Macbooks (This was introduced with or sometime before the |
624 | * MacBookPro14,3), the ACPI GPE method differentiates between the OS type: On |
625 | * Darwin, only a notification is signaled, whereas on other OSes, the GPIO's |
626 | * value is read and then inverted. |
627 | * |
628 | * Because Linux masquerades as Darwin, it ends up in the notification-only code |
629 | * path. On MMIO gmux's, this seems to lead to us being unable to clear interrupts, |
630 | * unless we call GMSP(0). Without this, there is a flood of status=0 interrupts |
631 | * that can't be cleared. This issue seems to be unique to MMIO gmux's. |
632 | */ |
633 | |
634 | static inline void gmux_disable_interrupts(struct apple_gmux_data *gmux_data) |
635 | { |
636 | gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE, |
637 | GMUX_INTERRUPT_DISABLE); |
638 | } |
639 | |
640 | static inline void gmux_enable_interrupts(struct apple_gmux_data *gmux_data) |
641 | { |
642 | gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE, |
643 | GMUX_INTERRUPT_ENABLE); |
644 | } |
645 | |
646 | static inline u8 gmux_interrupt_get_status(struct apple_gmux_data *gmux_data) |
647 | { |
648 | return gmux_read8(gmux_data, GMUX_PORT_INTERRUPT_STATUS); |
649 | } |
650 | |
651 | static void gmux_clear_interrupts(struct apple_gmux_data *gmux_data) |
652 | { |
653 | u8 status; |
654 | |
655 | /* to clear interrupts write back current status */ |
656 | status = gmux_interrupt_get_status(gmux_data); |
657 | gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_STATUS, val: status); |
658 | /* Prevent flood of status=0 interrupts */ |
659 | if (gmux_data->config == &apple_gmux_mmio) |
660 | acpi_execute_simple_method(handle: gmux_data->dhandle, method: "GMSP" , arg: 0); |
661 | } |
662 | |
663 | static void gmux_notify_handler(acpi_handle device, u32 value, void *context) |
664 | { |
665 | u8 status; |
666 | struct pnp_dev *pnp = (struct pnp_dev *)context; |
667 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pdev: pnp); |
668 | |
669 | status = gmux_interrupt_get_status(gmux_data); |
670 | gmux_disable_interrupts(gmux_data); |
671 | pr_debug("Notify handler called: status %d\n" , status); |
672 | |
673 | gmux_clear_interrupts(gmux_data); |
674 | gmux_enable_interrupts(gmux_data); |
675 | |
676 | if (status & GMUX_INTERRUPT_STATUS_POWER) |
677 | complete(&gmux_data->powerchange_done); |
678 | } |
679 | |
680 | /** |
681 | * DOC: Debugfs Interface |
682 | * |
683 | * gmux ports can be accessed from userspace as a debugfs interface. For example: |
684 | * |
685 | * # echo 4 > /sys/kernel/debug/apple_gmux/selected_port |
686 | * # cat /sys/kernel/debug/apple_gmux/selected_port_data | xxd -p |
687 | * 00000005 |
688 | * |
689 | * Reads 4 bytes from port 4 (GMUX_PORT_VERSION_MAJOR). |
690 | * |
691 | * 1 and 4 byte writes are also allowed. |
692 | */ |
693 | |
694 | static ssize_t gmux_selected_port_data_write(struct file *file, |
695 | const char __user *userbuf, size_t count, loff_t *ppos) |
696 | { |
697 | struct apple_gmux_data *gmux_data = file->private_data; |
698 | |
699 | if (*ppos) |
700 | return -EINVAL; |
701 | |
702 | if (count == 1) { |
703 | u8 data; |
704 | |
705 | if (copy_from_user(to: &data, from: userbuf, n: 1)) |
706 | return -EFAULT; |
707 | |
708 | gmux_write8(gmux_data, port: gmux_data->selected_port, val: data); |
709 | } else if (count == 4) { |
710 | u32 data; |
711 | |
712 | if (copy_from_user(to: &data, from: userbuf, n: 4)) |
713 | return -EFAULT; |
714 | |
715 | gmux_write32(gmux_data, port: gmux_data->selected_port, val: data); |
716 | } else |
717 | return -EINVAL; |
718 | |
719 | return count; |
720 | } |
721 | |
722 | static ssize_t gmux_selected_port_data_read(struct file *file, |
723 | char __user *userbuf, size_t count, loff_t *ppos) |
724 | { |
725 | struct apple_gmux_data *gmux_data = file->private_data; |
726 | u32 data; |
727 | |
728 | data = gmux_read32(gmux_data, port: gmux_data->selected_port); |
729 | |
730 | return simple_read_from_buffer(to: userbuf, count, ppos, from: &data, available: sizeof(data)); |
731 | } |
732 | |
733 | static const struct file_operations gmux_port_data_ops = { |
734 | .open = simple_open, |
735 | .write = gmux_selected_port_data_write, |
736 | .read = gmux_selected_port_data_read |
737 | }; |
738 | |
739 | static void gmux_init_debugfs(struct apple_gmux_data *gmux_data) |
740 | { |
741 | gmux_data->debug_dentry = debugfs_create_dir(KBUILD_MODNAME, NULL); |
742 | |
743 | debugfs_create_u8(name: "selected_port" , mode: 0644, parent: gmux_data->debug_dentry, |
744 | value: &gmux_data->selected_port); |
745 | debugfs_create_file(name: "selected_port_data" , mode: 0644, parent: gmux_data->debug_dentry, |
746 | data: gmux_data, fops: &gmux_port_data_ops); |
747 | } |
748 | |
749 | static void gmux_fini_debugfs(struct apple_gmux_data *gmux_data) |
750 | { |
751 | debugfs_remove_recursive(dentry: gmux_data->debug_dentry); |
752 | } |
753 | |
754 | static int gmux_suspend(struct device *dev) |
755 | { |
756 | struct pnp_dev *pnp = to_pnp_dev(dev); |
757 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pdev: pnp); |
758 | |
759 | gmux_disable_interrupts(gmux_data); |
760 | return 0; |
761 | } |
762 | |
763 | static int gmux_resume(struct device *dev) |
764 | { |
765 | struct pnp_dev *pnp = to_pnp_dev(dev); |
766 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pdev: pnp); |
767 | |
768 | gmux_enable_interrupts(gmux_data); |
769 | gmux_write_switch_state(gmux_data); |
770 | if (gmux_data->power_state == VGA_SWITCHEROO_OFF) |
771 | gmux_set_discrete_state(gmux_data, state: gmux_data->power_state); |
772 | return 0; |
773 | } |
774 | |
775 | static int is_thunderbolt(struct device *dev, void *data) |
776 | { |
777 | return to_pci_dev(dev)->is_thunderbolt; |
778 | } |
779 | |
780 | static int gmux_probe(struct pnp_dev *pnp, const struct pnp_device_id *id) |
781 | { |
782 | struct apple_gmux_data *gmux_data; |
783 | struct resource *res; |
784 | struct backlight_properties props; |
785 | struct backlight_device *bdev = NULL; |
786 | u8 ver_major, ver_minor, ver_release; |
787 | bool register_bdev = true; |
788 | int ret = -ENXIO; |
789 | acpi_status status; |
790 | unsigned long long gpe; |
791 | enum apple_gmux_type type; |
792 | u32 version; |
793 | |
794 | if (apple_gmux_data) |
795 | return -EBUSY; |
796 | |
797 | if (!apple_gmux_detect(pnp_dev: pnp, type_ret: &type)) { |
798 | pr_info("gmux device not present\n" ); |
799 | return -ENODEV; |
800 | } |
801 | |
802 | gmux_data = kzalloc(size: sizeof(*gmux_data), GFP_KERNEL); |
803 | if (!gmux_data) |
804 | return -ENOMEM; |
805 | pnp_set_drvdata(pdev: pnp, data: gmux_data); |
806 | |
807 | switch (type) { |
808 | case APPLE_GMUX_TYPE_MMIO: |
809 | gmux_data->config = &apple_gmux_mmio; |
810 | mutex_init(&gmux_data->index_lock); |
811 | |
812 | res = pnp_get_resource(dev: pnp, IORESOURCE_MEM, num: 0); |
813 | gmux_data->iostart = res->start; |
814 | /* Although the ACPI table only allocates 8 bytes, we need 16. */ |
815 | gmux_data->iolen = 16; |
816 | if (!request_mem_region(gmux_data->iostart, gmux_data->iolen, |
817 | "Apple gmux" )) { |
818 | pr_err("gmux I/O already in use\n" ); |
819 | goto err_free; |
820 | } |
821 | gmux_data->iomem_base = ioremap(offset: gmux_data->iostart, size: gmux_data->iolen); |
822 | if (!gmux_data->iomem_base) { |
823 | pr_err("couldn't remap gmux mmio region" ); |
824 | goto err_release; |
825 | } |
826 | goto get_version; |
827 | case APPLE_GMUX_TYPE_INDEXED: |
828 | gmux_data->config = &apple_gmux_index; |
829 | mutex_init(&gmux_data->index_lock); |
830 | break; |
831 | case APPLE_GMUX_TYPE_PIO: |
832 | gmux_data->config = &apple_gmux_pio; |
833 | break; |
834 | } |
835 | |
836 | res = pnp_get_resource(dev: pnp, IORESOURCE_IO, num: 0); |
837 | gmux_data->iostart = res->start; |
838 | gmux_data->iolen = resource_size(res); |
839 | |
840 | if (!request_region(gmux_data->iostart, gmux_data->iolen, |
841 | "Apple gmux" )) { |
842 | pr_err("gmux I/O already in use\n" ); |
843 | goto err_free; |
844 | } |
845 | |
846 | get_version: |
847 | if (gmux_data->config->read_version_as_u32) { |
848 | version = gmux_read32(gmux_data, GMUX_PORT_VERSION_MAJOR); |
849 | ver_major = (version >> 24) & 0xff; |
850 | ver_minor = (version >> 16) & 0xff; |
851 | ver_release = (version >> 8) & 0xff; |
852 | } else { |
853 | ver_major = gmux_read8(gmux_data, GMUX_PORT_VERSION_MAJOR); |
854 | ver_minor = gmux_read8(gmux_data, GMUX_PORT_VERSION_MINOR); |
855 | ver_release = gmux_read8(gmux_data, GMUX_PORT_VERSION_RELEASE); |
856 | } |
857 | pr_info("Found gmux version %d.%d.%d [%s]\n" , ver_major, ver_minor, |
858 | ver_release, gmux_data->config->name); |
859 | |
860 | memset(&props, 0, sizeof(props)); |
861 | props.type = BACKLIGHT_PLATFORM; |
862 | |
863 | /* |
864 | * All MMIO gmux's have 0xffff as max brightness, but some iMacs incorrectly |
865 | * report 0x03ff, despite the firmware being happy to set 0xffff as the brightness |
866 | * at boot. Force 0xffff for all MMIO gmux's so they all have the correct brightness |
867 | * range. |
868 | */ |
869 | if (type == APPLE_GMUX_TYPE_MMIO) |
870 | props.max_brightness = MMIO_GMUX_MAX_BRIGHTNESS; |
871 | else |
872 | props.max_brightness = gmux_read32(gmux_data, GMUX_PORT_MAX_BRIGHTNESS); |
873 | |
874 | #if IS_REACHABLE(CONFIG_ACPI_VIDEO) |
875 | register_bdev = acpi_video_get_backlight_type() == acpi_backlight_apple_gmux; |
876 | #endif |
877 | if (register_bdev) { |
878 | /* |
879 | * Currently it's assumed that the maximum brightness is less than |
880 | * 2^24 for compatibility with old gmux versions. Cap the max |
881 | * brightness at this value, but print a warning if the hardware |
882 | * reports something higher so that it can be fixed. |
883 | */ |
884 | if (WARN_ON(props.max_brightness > GMUX_MAX_BRIGHTNESS)) |
885 | props.max_brightness = GMUX_MAX_BRIGHTNESS; |
886 | |
887 | bdev = backlight_device_register(name: "gmux_backlight" , dev: &pnp->dev, |
888 | devdata: gmux_data, ops: &gmux_bl_ops, props: &props); |
889 | if (IS_ERR(ptr: bdev)) { |
890 | ret = PTR_ERR(ptr: bdev); |
891 | goto err_unmap; |
892 | } |
893 | |
894 | gmux_data->bdev = bdev; |
895 | bdev->props.brightness = gmux_get_brightness(bd: bdev); |
896 | backlight_update_status(bd: bdev); |
897 | } |
898 | |
899 | gmux_data->power_state = VGA_SWITCHEROO_ON; |
900 | |
901 | gmux_data->dhandle = ACPI_HANDLE(&pnp->dev); |
902 | if (!gmux_data->dhandle) { |
903 | pr_err("Cannot find acpi handle for pnp device %s\n" , |
904 | dev_name(&pnp->dev)); |
905 | ret = -ENODEV; |
906 | goto err_notify; |
907 | } |
908 | |
909 | status = acpi_evaluate_integer(handle: gmux_data->dhandle, pathname: "GMGP" , NULL, data: &gpe); |
910 | if (ACPI_SUCCESS(status)) { |
911 | gmux_data->gpe = (int)gpe; |
912 | |
913 | status = acpi_install_notify_handler(device: gmux_data->dhandle, |
914 | ACPI_DEVICE_NOTIFY, |
915 | handler: &gmux_notify_handler, context: pnp); |
916 | if (ACPI_FAILURE(status)) { |
917 | pr_err("Install notify handler failed: %s\n" , |
918 | acpi_format_exception(status)); |
919 | ret = -ENODEV; |
920 | goto err_notify; |
921 | } |
922 | |
923 | status = acpi_enable_gpe(NULL, gpe_number: gmux_data->gpe); |
924 | if (ACPI_FAILURE(status)) { |
925 | pr_err("Cannot enable gpe: %s\n" , |
926 | acpi_format_exception(status)); |
927 | goto err_enable_gpe; |
928 | } |
929 | } else { |
930 | pr_warn("No GPE found for gmux\n" ); |
931 | gmux_data->gpe = -1; |
932 | } |
933 | |
934 | /* |
935 | * If Thunderbolt is present, the external DP port is not fully |
936 | * switchable. Force its AUX channel to the discrete GPU. |
937 | */ |
938 | gmux_data->external_switchable = |
939 | !bus_for_each_dev(bus: &pci_bus_type, NULL, NULL, fn: is_thunderbolt); |
940 | if (!gmux_data->external_switchable) |
941 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL, val: 3); |
942 | |
943 | apple_gmux_data = gmux_data; |
944 | init_completion(x: &gmux_data->powerchange_done); |
945 | gmux_enable_interrupts(gmux_data); |
946 | gmux_read_switch_state(gmux_data); |
947 | |
948 | /* |
949 | * Retina MacBook Pros cannot switch the panel's AUX separately |
950 | * and need eDP pre-calibration. They are distinguishable from |
951 | * pre-retinas by having an "indexed" or "T2" gmux. |
952 | * |
953 | * Pre-retina MacBook Pros can switch the panel's DDC separately. |
954 | */ |
955 | ret = vga_switcheroo_register_handler(handler: gmux_data->config->gmux_handler, |
956 | handler_flags: gmux_data->config->handler_flags); |
957 | if (ret) { |
958 | pr_err("Failed to register vga_switcheroo handler\n" ); |
959 | goto err_register_handler; |
960 | } |
961 | |
962 | gmux_init_debugfs(gmux_data); |
963 | return 0; |
964 | |
965 | err_register_handler: |
966 | gmux_disable_interrupts(gmux_data); |
967 | apple_gmux_data = NULL; |
968 | if (gmux_data->gpe >= 0) |
969 | acpi_disable_gpe(NULL, gpe_number: gmux_data->gpe); |
970 | err_enable_gpe: |
971 | if (gmux_data->gpe >= 0) |
972 | acpi_remove_notify_handler(device: gmux_data->dhandle, |
973 | ACPI_DEVICE_NOTIFY, |
974 | handler: &gmux_notify_handler); |
975 | err_notify: |
976 | backlight_device_unregister(bd: bdev); |
977 | err_unmap: |
978 | if (gmux_data->iomem_base) |
979 | iounmap(addr: gmux_data->iomem_base); |
980 | err_release: |
981 | if (gmux_data->config->resource_type == IORESOURCE_MEM) |
982 | release_mem_region(gmux_data->iostart, gmux_data->iolen); |
983 | else |
984 | release_region(gmux_data->iostart, gmux_data->iolen); |
985 | err_free: |
986 | kfree(objp: gmux_data); |
987 | return ret; |
988 | } |
989 | |
990 | static void gmux_remove(struct pnp_dev *pnp) |
991 | { |
992 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pdev: pnp); |
993 | |
994 | gmux_fini_debugfs(gmux_data); |
995 | vga_switcheroo_unregister_handler(); |
996 | gmux_disable_interrupts(gmux_data); |
997 | if (gmux_data->gpe >= 0) { |
998 | acpi_disable_gpe(NULL, gpe_number: gmux_data->gpe); |
999 | acpi_remove_notify_handler(device: gmux_data->dhandle, |
1000 | ACPI_DEVICE_NOTIFY, |
1001 | handler: &gmux_notify_handler); |
1002 | } |
1003 | |
1004 | backlight_device_unregister(bd: gmux_data->bdev); |
1005 | |
1006 | if (gmux_data->iomem_base) { |
1007 | iounmap(addr: gmux_data->iomem_base); |
1008 | release_mem_region(gmux_data->iostart, gmux_data->iolen); |
1009 | } else |
1010 | release_region(gmux_data->iostart, gmux_data->iolen); |
1011 | apple_gmux_data = NULL; |
1012 | kfree(objp: gmux_data); |
1013 | } |
1014 | |
1015 | static const struct pnp_device_id gmux_device_ids[] = { |
1016 | {GMUX_ACPI_HID, 0}, |
1017 | {"" , 0} |
1018 | }; |
1019 | |
1020 | static const struct dev_pm_ops gmux_dev_pm_ops = { |
1021 | .suspend = gmux_suspend, |
1022 | .resume = gmux_resume, |
1023 | }; |
1024 | |
1025 | static struct pnp_driver gmux_pnp_driver = { |
1026 | .name = "apple-gmux" , |
1027 | .probe = gmux_probe, |
1028 | .remove = gmux_remove, |
1029 | .id_table = gmux_device_ids, |
1030 | .driver = { |
1031 | .pm = &gmux_dev_pm_ops, |
1032 | }, |
1033 | }; |
1034 | |
1035 | module_pnp_driver(gmux_pnp_driver); |
1036 | MODULE_AUTHOR("Seth Forshee <seth.forshee@canonical.com>" ); |
1037 | MODULE_DESCRIPTION("Apple Gmux Driver" ); |
1038 | MODULE_LICENSE("GPL" ); |
1039 | MODULE_DEVICE_TABLE(pnp, gmux_device_ids); |
1040 | |