Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Gmux driver for Apple laptops |
| 3 | * |
| 4 | * Copyright (C) Canonical Ltd. <seth.forshee@canonical.com> |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 5 | * Copyright (C) 2010-2012 Andreas Heider <andreas@meetr.de> |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/backlight.h> |
| 18 | #include <linux/acpi.h> |
| 19 | #include <linux/pnp.h> |
| 20 | #include <linux/apple_bl.h> |
| 21 | #include <linux/slab.h> |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 22 | #include <linux/delay.h> |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 23 | #include <linux/pci.h> |
| 24 | #include <linux/vga_switcheroo.h> |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 25 | #include <linux/vgaarb.h> |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 26 | #include <acpi/video.h> |
| 27 | #include <asm/io.h> |
| 28 | |
| 29 | struct apple_gmux_data { |
| 30 | unsigned long iostart; |
| 31 | unsigned long iolen; |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 32 | bool indexed; |
| 33 | struct mutex index_lock; |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 34 | |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 35 | struct pci_dev *pdev; |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 36 | struct backlight_device *bdev; |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 37 | |
| 38 | /* switcheroo data */ |
| 39 | acpi_handle dhandle; |
| 40 | int gpe; |
| 41 | enum vga_switcheroo_client_id resume_client_id; |
| 42 | enum vga_switcheroo_state power_state; |
| 43 | struct completion powerchange_done; |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 44 | }; |
| 45 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 46 | static struct apple_gmux_data *apple_gmux_data; |
| 47 | |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 48 | /* |
| 49 | * gmux port offsets. Many of these are not yet used, but may be in the |
| 50 | * future, and it's useful to have them documented here anyhow. |
| 51 | */ |
| 52 | #define GMUX_PORT_VERSION_MAJOR 0x04 |
| 53 | #define GMUX_PORT_VERSION_MINOR 0x05 |
| 54 | #define GMUX_PORT_VERSION_RELEASE 0x06 |
| 55 | #define GMUX_PORT_SWITCH_DISPLAY 0x10 |
| 56 | #define GMUX_PORT_SWITCH_GET_DISPLAY 0x11 |
| 57 | #define GMUX_PORT_INTERRUPT_ENABLE 0x14 |
| 58 | #define GMUX_PORT_INTERRUPT_STATUS 0x16 |
| 59 | #define GMUX_PORT_SWITCH_DDC 0x28 |
| 60 | #define GMUX_PORT_SWITCH_EXTERNAL 0x40 |
| 61 | #define GMUX_PORT_SWITCH_GET_EXTERNAL 0x41 |
| 62 | #define GMUX_PORT_DISCRETE_POWER 0x50 |
| 63 | #define GMUX_PORT_MAX_BRIGHTNESS 0x70 |
| 64 | #define GMUX_PORT_BRIGHTNESS 0x74 |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 65 | #define GMUX_PORT_VALUE 0xc2 |
| 66 | #define GMUX_PORT_READ 0xd0 |
| 67 | #define GMUX_PORT_WRITE 0xd4 |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 68 | |
| 69 | #define GMUX_MIN_IO_LEN (GMUX_PORT_BRIGHTNESS + 4) |
| 70 | |
| 71 | #define GMUX_INTERRUPT_ENABLE 0xff |
| 72 | #define GMUX_INTERRUPT_DISABLE 0x00 |
| 73 | |
| 74 | #define GMUX_INTERRUPT_STATUS_ACTIVE 0 |
| 75 | #define GMUX_INTERRUPT_STATUS_DISPLAY (1 << 0) |
| 76 | #define GMUX_INTERRUPT_STATUS_POWER (1 << 2) |
| 77 | #define GMUX_INTERRUPT_STATUS_HOTPLUG (1 << 3) |
| 78 | |
| 79 | #define GMUX_BRIGHTNESS_MASK 0x00ffffff |
| 80 | #define GMUX_MAX_BRIGHTNESS GMUX_BRIGHTNESS_MASK |
| 81 | |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 82 | static u8 gmux_pio_read8(struct apple_gmux_data *gmux_data, int port) |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 83 | { |
| 84 | return inb(gmux_data->iostart + port); |
| 85 | } |
| 86 | |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 87 | static void gmux_pio_write8(struct apple_gmux_data *gmux_data, int port, |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 88 | u8 val) |
| 89 | { |
| 90 | outb(val, gmux_data->iostart + port); |
| 91 | } |
| 92 | |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 93 | static u32 gmux_pio_read32(struct apple_gmux_data *gmux_data, int port) |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 94 | { |
| 95 | return inl(gmux_data->iostart + port); |
| 96 | } |
| 97 | |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 98 | static void gmux_pio_write32(struct apple_gmux_data *gmux_data, int port, |
| 99 | u32 val) |
Matthew Garrett | 7e30ed6 | 2012-08-09 12:47:00 -0400 | [diff] [blame] | 100 | { |
| 101 | int i; |
| 102 | u8 tmpval; |
| 103 | |
| 104 | for (i = 0; i < 4; i++) { |
| 105 | tmpval = (val >> (i * 8)) & 0xff; |
Seth Forshee | e6d9d3d | 2012-08-21 21:56:49 -0500 | [diff] [blame] | 106 | outb(tmpval, gmux_data->iostart + port + i); |
Matthew Garrett | 7e30ed6 | 2012-08-09 12:47:00 -0400 | [diff] [blame] | 107 | } |
| 108 | } |
| 109 | |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 110 | static int gmux_index_wait_ready(struct apple_gmux_data *gmux_data) |
| 111 | { |
| 112 | int i = 200; |
| 113 | u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); |
| 114 | |
| 115 | while (i && (gwr & 0x01)) { |
| 116 | inb(gmux_data->iostart + GMUX_PORT_READ); |
| 117 | gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); |
| 118 | udelay(100); |
| 119 | i--; |
| 120 | } |
| 121 | |
| 122 | return !!i; |
| 123 | } |
| 124 | |
| 125 | static int gmux_index_wait_complete(struct apple_gmux_data *gmux_data) |
| 126 | { |
| 127 | int i = 200; |
| 128 | u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); |
| 129 | |
| 130 | while (i && !(gwr & 0x01)) { |
| 131 | gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); |
| 132 | udelay(100); |
| 133 | i--; |
| 134 | } |
| 135 | |
| 136 | if (gwr & 0x01) |
| 137 | inb(gmux_data->iostart + GMUX_PORT_READ); |
| 138 | |
| 139 | return !!i; |
| 140 | } |
| 141 | |
| 142 | static u8 gmux_index_read8(struct apple_gmux_data *gmux_data, int port) |
| 143 | { |
| 144 | u8 val; |
| 145 | |
| 146 | mutex_lock(&gmux_data->index_lock); |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 147 | gmux_index_wait_ready(gmux_data); |
Bernhard Froemel | c5a5052 | 2012-08-25 10:30:48 +0200 | [diff] [blame] | 148 | outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ); |
| 149 | gmux_index_wait_complete(gmux_data); |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 150 | val = inb(gmux_data->iostart + GMUX_PORT_VALUE); |
| 151 | mutex_unlock(&gmux_data->index_lock); |
| 152 | |
| 153 | return val; |
| 154 | } |
| 155 | |
| 156 | static void gmux_index_write8(struct apple_gmux_data *gmux_data, int port, |
| 157 | u8 val) |
| 158 | { |
| 159 | mutex_lock(&gmux_data->index_lock); |
| 160 | outb(val, gmux_data->iostart + GMUX_PORT_VALUE); |
| 161 | gmux_index_wait_ready(gmux_data); |
| 162 | outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE); |
| 163 | gmux_index_wait_complete(gmux_data); |
| 164 | mutex_unlock(&gmux_data->index_lock); |
| 165 | } |
| 166 | |
| 167 | static u32 gmux_index_read32(struct apple_gmux_data *gmux_data, int port) |
| 168 | { |
| 169 | u32 val; |
| 170 | |
| 171 | mutex_lock(&gmux_data->index_lock); |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 172 | gmux_index_wait_ready(gmux_data); |
Bernhard Froemel | c5a5052 | 2012-08-25 10:30:48 +0200 | [diff] [blame] | 173 | outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ); |
| 174 | gmux_index_wait_complete(gmux_data); |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 175 | val = inl(gmux_data->iostart + GMUX_PORT_VALUE); |
| 176 | mutex_unlock(&gmux_data->index_lock); |
| 177 | |
| 178 | return val; |
| 179 | } |
| 180 | |
| 181 | static void gmux_index_write32(struct apple_gmux_data *gmux_data, int port, |
| 182 | u32 val) |
| 183 | { |
| 184 | int i; |
| 185 | u8 tmpval; |
| 186 | |
| 187 | mutex_lock(&gmux_data->index_lock); |
| 188 | |
| 189 | for (i = 0; i < 4; i++) { |
| 190 | tmpval = (val >> (i * 8)) & 0xff; |
| 191 | outb(tmpval, gmux_data->iostart + GMUX_PORT_VALUE + i); |
| 192 | } |
| 193 | |
| 194 | gmux_index_wait_ready(gmux_data); |
| 195 | outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE); |
| 196 | gmux_index_wait_complete(gmux_data); |
| 197 | mutex_unlock(&gmux_data->index_lock); |
| 198 | } |
| 199 | |
| 200 | static u8 gmux_read8(struct apple_gmux_data *gmux_data, int port) |
| 201 | { |
| 202 | if (gmux_data->indexed) |
| 203 | return gmux_index_read8(gmux_data, port); |
| 204 | else |
| 205 | return gmux_pio_read8(gmux_data, port); |
| 206 | } |
| 207 | |
| 208 | static void gmux_write8(struct apple_gmux_data *gmux_data, int port, u8 val) |
| 209 | { |
| 210 | if (gmux_data->indexed) |
| 211 | gmux_index_write8(gmux_data, port, val); |
| 212 | else |
| 213 | gmux_pio_write8(gmux_data, port, val); |
| 214 | } |
| 215 | |
| 216 | static u32 gmux_read32(struct apple_gmux_data *gmux_data, int port) |
| 217 | { |
| 218 | if (gmux_data->indexed) |
| 219 | return gmux_index_read32(gmux_data, port); |
| 220 | else |
| 221 | return gmux_pio_read32(gmux_data, port); |
| 222 | } |
| 223 | |
| 224 | static void gmux_write32(struct apple_gmux_data *gmux_data, int port, |
| 225 | u32 val) |
| 226 | { |
| 227 | if (gmux_data->indexed) |
| 228 | gmux_index_write32(gmux_data, port, val); |
| 229 | else |
| 230 | gmux_pio_write32(gmux_data, port, val); |
| 231 | } |
| 232 | |
| 233 | static bool gmux_is_indexed(struct apple_gmux_data *gmux_data) |
| 234 | { |
| 235 | u16 val; |
| 236 | |
| 237 | outb(0xaa, gmux_data->iostart + 0xcc); |
| 238 | outb(0x55, gmux_data->iostart + 0xcd); |
| 239 | outb(0x00, gmux_data->iostart + 0xce); |
| 240 | |
| 241 | val = inb(gmux_data->iostart + 0xcc) | |
| 242 | (inb(gmux_data->iostart + 0xcd) << 8); |
| 243 | |
| 244 | if (val == 0x55aa) |
| 245 | return true; |
| 246 | |
| 247 | return false; |
| 248 | } |
| 249 | |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 250 | static int gmux_get_brightness(struct backlight_device *bd) |
| 251 | { |
| 252 | struct apple_gmux_data *gmux_data = bl_get_data(bd); |
| 253 | return gmux_read32(gmux_data, GMUX_PORT_BRIGHTNESS) & |
| 254 | GMUX_BRIGHTNESS_MASK; |
| 255 | } |
| 256 | |
| 257 | static int gmux_update_status(struct backlight_device *bd) |
| 258 | { |
| 259 | struct apple_gmux_data *gmux_data = bl_get_data(bd); |
| 260 | u32 brightness = bd->props.brightness; |
| 261 | |
Seth Forshee | 9696088 | 2012-04-19 10:55:35 -0500 | [diff] [blame] | 262 | if (bd->props.state & BL_CORE_SUSPENDED) |
Matthew Garrett | a2f01a8 | 2012-06-01 15:18:52 -0400 | [diff] [blame] | 263 | return 0; |
Seth Forshee | 9696088 | 2012-04-19 10:55:35 -0500 | [diff] [blame] | 264 | |
Matthew Garrett | 7e30ed6 | 2012-08-09 12:47:00 -0400 | [diff] [blame] | 265 | gmux_write32(gmux_data, GMUX_PORT_BRIGHTNESS, brightness); |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 266 | |
| 267 | return 0; |
| 268 | } |
| 269 | |
| 270 | static const struct backlight_ops gmux_bl_ops = { |
Seth Forshee | 9696088 | 2012-04-19 10:55:35 -0500 | [diff] [blame] | 271 | .options = BL_CORE_SUSPENDRESUME, |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 272 | .get_brightness = gmux_get_brightness, |
| 273 | .update_status = gmux_update_status, |
| 274 | }; |
| 275 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 276 | static int gmux_switchto(enum vga_switcheroo_client_id id) |
| 277 | { |
| 278 | if (id == VGA_SWITCHEROO_IGD) { |
| 279 | gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 1); |
| 280 | gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DISPLAY, 2); |
| 281 | gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 2); |
| 282 | } else { |
| 283 | gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 2); |
| 284 | gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DISPLAY, 3); |
| 285 | gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 3); |
| 286 | } |
| 287 | |
| 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | static int gmux_set_discrete_state(struct apple_gmux_data *gmux_data, |
| 292 | enum vga_switcheroo_state state) |
| 293 | { |
Wolfram Sang | 16735d0 | 2013-11-14 14:32:02 -0800 | [diff] [blame] | 294 | reinit_completion(&gmux_data->powerchange_done); |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 295 | |
| 296 | if (state == VGA_SWITCHEROO_ON) { |
| 297 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 1); |
| 298 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 3); |
| 299 | pr_debug("Discrete card powered up\n"); |
| 300 | } else { |
| 301 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 1); |
| 302 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 0); |
| 303 | pr_debug("Discrete card powered down\n"); |
| 304 | } |
| 305 | |
| 306 | gmux_data->power_state = state; |
| 307 | |
| 308 | if (gmux_data->gpe >= 0 && |
| 309 | !wait_for_completion_interruptible_timeout(&gmux_data->powerchange_done, |
| 310 | msecs_to_jiffies(200))) |
| 311 | pr_warn("Timeout waiting for gmux switch to complete\n"); |
| 312 | |
| 313 | return 0; |
| 314 | } |
| 315 | |
| 316 | static int gmux_set_power_state(enum vga_switcheroo_client_id id, |
| 317 | enum vga_switcheroo_state state) |
| 318 | { |
| 319 | if (id == VGA_SWITCHEROO_IGD) |
| 320 | return 0; |
| 321 | |
| 322 | return gmux_set_discrete_state(apple_gmux_data, state); |
| 323 | } |
| 324 | |
| 325 | static int gmux_get_client_id(struct pci_dev *pdev) |
| 326 | { |
| 327 | /* |
| 328 | * Early Macbook Pros with switchable graphics use nvidia |
| 329 | * integrated graphics. Hardcode that the 9400M is integrated. |
| 330 | */ |
| 331 | if (pdev->vendor == PCI_VENDOR_ID_INTEL) |
| 332 | return VGA_SWITCHEROO_IGD; |
| 333 | else if (pdev->vendor == PCI_VENDOR_ID_NVIDIA && |
| 334 | pdev->device == 0x0863) |
| 335 | return VGA_SWITCHEROO_IGD; |
| 336 | else |
| 337 | return VGA_SWITCHEROO_DIS; |
| 338 | } |
| 339 | |
| 340 | static enum vga_switcheroo_client_id |
| 341 | gmux_active_client(struct apple_gmux_data *gmux_data) |
| 342 | { |
| 343 | if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_DISPLAY) == 2) |
| 344 | return VGA_SWITCHEROO_IGD; |
| 345 | |
| 346 | return VGA_SWITCHEROO_DIS; |
| 347 | } |
| 348 | |
| 349 | static struct vga_switcheroo_handler gmux_handler = { |
| 350 | .switchto = gmux_switchto, |
| 351 | .power_state = gmux_set_power_state, |
| 352 | .get_client_id = gmux_get_client_id, |
| 353 | }; |
| 354 | |
| 355 | static inline void gmux_disable_interrupts(struct apple_gmux_data *gmux_data) |
| 356 | { |
| 357 | gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE, |
| 358 | GMUX_INTERRUPT_DISABLE); |
| 359 | } |
| 360 | |
| 361 | static inline void gmux_enable_interrupts(struct apple_gmux_data *gmux_data) |
| 362 | { |
| 363 | gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE, |
| 364 | GMUX_INTERRUPT_ENABLE); |
| 365 | } |
| 366 | |
| 367 | static inline u8 gmux_interrupt_get_status(struct apple_gmux_data *gmux_data) |
| 368 | { |
| 369 | return gmux_read8(gmux_data, GMUX_PORT_INTERRUPT_STATUS); |
| 370 | } |
| 371 | |
| 372 | static void gmux_clear_interrupts(struct apple_gmux_data *gmux_data) |
| 373 | { |
| 374 | u8 status; |
| 375 | |
| 376 | /* to clear interrupts write back current status */ |
| 377 | status = gmux_interrupt_get_status(gmux_data); |
| 378 | gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_STATUS, status); |
| 379 | } |
| 380 | |
| 381 | static void gmux_notify_handler(acpi_handle device, u32 value, void *context) |
| 382 | { |
| 383 | u8 status; |
| 384 | struct pnp_dev *pnp = (struct pnp_dev *)context; |
| 385 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); |
| 386 | |
| 387 | status = gmux_interrupt_get_status(gmux_data); |
| 388 | gmux_disable_interrupts(gmux_data); |
| 389 | pr_debug("Notify handler called: status %d\n", status); |
| 390 | |
| 391 | gmux_clear_interrupts(gmux_data); |
| 392 | gmux_enable_interrupts(gmux_data); |
| 393 | |
| 394 | if (status & GMUX_INTERRUPT_STATUS_POWER) |
| 395 | complete(&gmux_data->powerchange_done); |
| 396 | } |
| 397 | |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 398 | static int gmux_suspend(struct device *dev) |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 399 | { |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 400 | struct pnp_dev *pnp = to_pnp_dev(dev); |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 401 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 402 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 403 | gmux_data->resume_client_id = gmux_active_client(gmux_data); |
| 404 | gmux_disable_interrupts(gmux_data); |
| 405 | return 0; |
| 406 | } |
| 407 | |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 408 | static int gmux_resume(struct device *dev) |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 409 | { |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 410 | struct pnp_dev *pnp = to_pnp_dev(dev); |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 411 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 412 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 413 | gmux_enable_interrupts(gmux_data); |
| 414 | gmux_switchto(gmux_data->resume_client_id); |
| 415 | if (gmux_data->power_state == VGA_SWITCHEROO_OFF) |
| 416 | gmux_set_discrete_state(gmux_data, gmux_data->power_state); |
| 417 | return 0; |
| 418 | } |
| 419 | |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 420 | static struct pci_dev *gmux_get_io_pdev(void) |
| 421 | { |
| 422 | struct pci_dev *pdev = NULL; |
| 423 | |
| 424 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev))) { |
| 425 | u16 cmd; |
| 426 | |
| 427 | pci_read_config_word(pdev, PCI_COMMAND, &cmd); |
| 428 | if (!(cmd & PCI_COMMAND_IO)) |
| 429 | continue; |
| 430 | |
| 431 | return pdev; |
| 432 | } |
| 433 | |
| 434 | return NULL; |
| 435 | } |
| 436 | |
Greg Kroah-Hartman | b859f15 | 2012-12-21 13:18:33 -0800 | [diff] [blame] | 437 | static int gmux_probe(struct pnp_dev *pnp, const struct pnp_device_id *id) |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 438 | { |
| 439 | struct apple_gmux_data *gmux_data; |
| 440 | struct resource *res; |
| 441 | struct backlight_properties props; |
| 442 | struct backlight_device *bdev; |
| 443 | u8 ver_major, ver_minor, ver_release; |
| 444 | int ret = -ENXIO; |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 445 | acpi_status status; |
| 446 | unsigned long long gpe; |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 447 | struct pci_dev *pdev = NULL; |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 448 | |
| 449 | if (apple_gmux_data) |
| 450 | return -EBUSY; |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 451 | |
| 452 | gmux_data = kzalloc(sizeof(*gmux_data), GFP_KERNEL); |
| 453 | if (!gmux_data) |
| 454 | return -ENOMEM; |
| 455 | pnp_set_drvdata(pnp, gmux_data); |
| 456 | |
| 457 | res = pnp_get_resource(pnp, IORESOURCE_IO, 0); |
| 458 | if (!res) { |
| 459 | pr_err("Failed to find gmux I/O resource\n"); |
| 460 | goto err_free; |
| 461 | } |
| 462 | |
| 463 | gmux_data->iostart = res->start; |
| 464 | gmux_data->iolen = res->end - res->start; |
| 465 | |
| 466 | if (gmux_data->iolen < GMUX_MIN_IO_LEN) { |
| 467 | pr_err("gmux I/O region too small (%lu < %u)\n", |
| 468 | gmux_data->iolen, GMUX_MIN_IO_LEN); |
| 469 | goto err_free; |
| 470 | } |
| 471 | |
| 472 | if (!request_region(gmux_data->iostart, gmux_data->iolen, |
| 473 | "Apple gmux")) { |
| 474 | pr_err("gmux I/O already in use\n"); |
| 475 | goto err_free; |
| 476 | } |
| 477 | |
| 478 | /* |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 479 | * Invalid version information may indicate either that the gmux |
| 480 | * device isn't present or that it's a new one that uses indexed |
| 481 | * io |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 482 | */ |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 483 | |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 484 | ver_major = gmux_read8(gmux_data, GMUX_PORT_VERSION_MAJOR); |
| 485 | ver_minor = gmux_read8(gmux_data, GMUX_PORT_VERSION_MINOR); |
| 486 | ver_release = gmux_read8(gmux_data, GMUX_PORT_VERSION_RELEASE); |
| 487 | if (ver_major == 0xff && ver_minor == 0xff && ver_release == 0xff) { |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 488 | if (gmux_is_indexed(gmux_data)) { |
Bernhard Froemel | 07f377d | 2012-08-25 10:30:49 +0200 | [diff] [blame] | 489 | u32 version; |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 490 | mutex_init(&gmux_data->index_lock); |
| 491 | gmux_data->indexed = true; |
Bernhard Froemel | 07f377d | 2012-08-25 10:30:49 +0200 | [diff] [blame] | 492 | version = gmux_read32(gmux_data, |
| 493 | GMUX_PORT_VERSION_MAJOR); |
| 494 | ver_major = (version >> 24) & 0xff; |
| 495 | ver_minor = (version >> 16) & 0xff; |
| 496 | ver_release = (version >> 8) & 0xff; |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 497 | } else { |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 498 | pr_info("gmux device not present or IO disabled\n"); |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 499 | ret = -ENODEV; |
| 500 | goto err_release; |
| 501 | } |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 502 | } |
Bernhard Froemel | 07f377d | 2012-08-25 10:30:49 +0200 | [diff] [blame] | 503 | pr_info("Found gmux version %d.%d.%d [%s]\n", ver_major, ver_minor, |
| 504 | ver_release, (gmux_data->indexed ? "indexed" : "classic")); |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 505 | |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 506 | /* |
| 507 | * Apple systems with gmux are EFI based and normally don't use |
| 508 | * VGA. In addition changing IO+MEM ownership between IGP and dGPU |
| 509 | * disables IO/MEM used for backlight control on some systems. |
| 510 | * Lock IO+MEM to GPU with active IO to prevent switch. |
| 511 | */ |
| 512 | pdev = gmux_get_io_pdev(); |
| 513 | if (pdev && vga_tryget(pdev, |
| 514 | VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM)) { |
| 515 | pr_err("IO+MEM vgaarb-locking for PCI:%s failed\n", |
| 516 | pci_name(pdev)); |
| 517 | ret = -EBUSY; |
| 518 | goto err_release; |
| 519 | } else if (pdev) |
| 520 | pr_info("locked IO for PCI:%s\n", pci_name(pdev)); |
| 521 | gmux_data->pdev = pdev; |
| 522 | |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 523 | memset(&props, 0, sizeof(props)); |
| 524 | props.type = BACKLIGHT_PLATFORM; |
| 525 | props.max_brightness = gmux_read32(gmux_data, GMUX_PORT_MAX_BRIGHTNESS); |
| 526 | |
| 527 | /* |
| 528 | * Currently it's assumed that the maximum brightness is less than |
| 529 | * 2^24 for compatibility with old gmux versions. Cap the max |
| 530 | * brightness at this value, but print a warning if the hardware |
| 531 | * reports something higher so that it can be fixed. |
| 532 | */ |
| 533 | if (WARN_ON(props.max_brightness > GMUX_MAX_BRIGHTNESS)) |
| 534 | props.max_brightness = GMUX_MAX_BRIGHTNESS; |
| 535 | |
| 536 | bdev = backlight_device_register("gmux_backlight", &pnp->dev, |
| 537 | gmux_data, &gmux_bl_ops, &props); |
| 538 | if (IS_ERR(bdev)) { |
| 539 | ret = PTR_ERR(bdev); |
| 540 | goto err_release; |
| 541 | } |
| 542 | |
| 543 | gmux_data->bdev = bdev; |
| 544 | bdev->props.brightness = gmux_get_brightness(bdev); |
| 545 | backlight_update_status(bdev); |
| 546 | |
| 547 | /* |
| 548 | * The backlight situation on Macs is complicated. If the gmux is |
| 549 | * present it's the best choice, because it always works for |
| 550 | * backlight control and supports more levels than other options. |
| 551 | * Disable the other backlight choices. |
| 552 | */ |
Corentin Chary | a60b217 | 2012-06-13 09:32:02 +0200 | [diff] [blame] | 553 | acpi_video_dmi_promote_vendor(); |
Hans de Goede | 10bffa6 | 2015-06-16 16:27:39 +0200 | [diff] [blame] | 554 | acpi_video_unregister_backlight(); |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 555 | apple_bl_unregister(); |
| 556 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 557 | gmux_data->power_state = VGA_SWITCHEROO_ON; |
| 558 | |
Rafael J. Wysocki | 3a83f99 | 2013-11-14 23:17:21 +0100 | [diff] [blame] | 559 | gmux_data->dhandle = ACPI_HANDLE(&pnp->dev); |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 560 | if (!gmux_data->dhandle) { |
| 561 | pr_err("Cannot find acpi handle for pnp device %s\n", |
| 562 | dev_name(&pnp->dev)); |
| 563 | ret = -ENODEV; |
| 564 | goto err_notify; |
| 565 | } |
| 566 | |
| 567 | status = acpi_evaluate_integer(gmux_data->dhandle, "GMGP", NULL, &gpe); |
| 568 | if (ACPI_SUCCESS(status)) { |
| 569 | gmux_data->gpe = (int)gpe; |
| 570 | |
| 571 | status = acpi_install_notify_handler(gmux_data->dhandle, |
| 572 | ACPI_DEVICE_NOTIFY, |
| 573 | &gmux_notify_handler, pnp); |
| 574 | if (ACPI_FAILURE(status)) { |
| 575 | pr_err("Install notify handler failed: %s\n", |
| 576 | acpi_format_exception(status)); |
| 577 | ret = -ENODEV; |
| 578 | goto err_notify; |
| 579 | } |
| 580 | |
| 581 | status = acpi_enable_gpe(NULL, gmux_data->gpe); |
| 582 | if (ACPI_FAILURE(status)) { |
| 583 | pr_err("Cannot enable gpe: %s\n", |
| 584 | acpi_format_exception(status)); |
| 585 | goto err_enable_gpe; |
| 586 | } |
| 587 | } else { |
| 588 | pr_warn("No GPE found for gmux\n"); |
| 589 | gmux_data->gpe = -1; |
| 590 | } |
| 591 | |
| 592 | if (vga_switcheroo_register_handler(&gmux_handler)) { |
| 593 | ret = -ENODEV; |
| 594 | goto err_register_handler; |
| 595 | } |
| 596 | |
| 597 | init_completion(&gmux_data->powerchange_done); |
| 598 | apple_gmux_data = gmux_data; |
| 599 | gmux_enable_interrupts(gmux_data); |
| 600 | |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 601 | return 0; |
| 602 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 603 | err_register_handler: |
| 604 | if (gmux_data->gpe >= 0) |
| 605 | acpi_disable_gpe(NULL, gmux_data->gpe); |
| 606 | err_enable_gpe: |
| 607 | if (gmux_data->gpe >= 0) |
| 608 | acpi_remove_notify_handler(gmux_data->dhandle, |
| 609 | ACPI_DEVICE_NOTIFY, |
| 610 | &gmux_notify_handler); |
| 611 | err_notify: |
| 612 | backlight_device_unregister(bdev); |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 613 | err_release: |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 614 | if (gmux_data->pdev) |
| 615 | vga_put(gmux_data->pdev, |
| 616 | VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM); |
| 617 | pci_dev_put(pdev); |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 618 | release_region(gmux_data->iostart, gmux_data->iolen); |
| 619 | err_free: |
| 620 | kfree(gmux_data); |
| 621 | return ret; |
| 622 | } |
| 623 | |
Greg Kroah-Hartman | b859f15 | 2012-12-21 13:18:33 -0800 | [diff] [blame] | 624 | static void gmux_remove(struct pnp_dev *pnp) |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 625 | { |
| 626 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); |
| 627 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 628 | vga_switcheroo_unregister_handler(); |
| 629 | gmux_disable_interrupts(gmux_data); |
| 630 | if (gmux_data->gpe >= 0) { |
| 631 | acpi_disable_gpe(NULL, gmux_data->gpe); |
| 632 | acpi_remove_notify_handler(gmux_data->dhandle, |
| 633 | ACPI_DEVICE_NOTIFY, |
| 634 | &gmux_notify_handler); |
| 635 | } |
| 636 | |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 637 | if (gmux_data->pdev) { |
| 638 | vga_put(gmux_data->pdev, |
| 639 | VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM); |
| 640 | pci_dev_put(gmux_data->pdev); |
| 641 | } |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 642 | backlight_device_unregister(gmux_data->bdev); |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 643 | |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 644 | release_region(gmux_data->iostart, gmux_data->iolen); |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 645 | apple_gmux_data = NULL; |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 646 | kfree(gmux_data); |
| 647 | |
| 648 | acpi_video_register(); |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 649 | apple_bl_register(); |
| 650 | } |
| 651 | |
| 652 | static const struct pnp_device_id gmux_device_ids[] = { |
| 653 | {"APP000B", 0}, |
| 654 | {"", 0} |
| 655 | }; |
| 656 | |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 657 | static const struct dev_pm_ops gmux_dev_pm_ops = { |
| 658 | .suspend = gmux_suspend, |
| 659 | .resume = gmux_resume, |
| 660 | }; |
| 661 | |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 662 | static struct pnp_driver gmux_pnp_driver = { |
| 663 | .name = "apple-gmux", |
| 664 | .probe = gmux_probe, |
Greg Kroah-Hartman | b859f15 | 2012-12-21 13:18:33 -0800 | [diff] [blame] | 665 | .remove = gmux_remove, |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 666 | .id_table = gmux_device_ids, |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 667 | .driver = { |
| 668 | .pm = &gmux_dev_pm_ops, |
| 669 | }, |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 670 | }; |
| 671 | |
Peter Huewe | 99f74f1 | 2015-03-16 21:46:36 +0100 | [diff] [blame] | 672 | module_pnp_driver(gmux_pnp_driver); |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 673 | MODULE_AUTHOR("Seth Forshee <seth.forshee@canonical.com>"); |
| 674 | MODULE_DESCRIPTION("Apple Gmux Driver"); |
| 675 | MODULE_LICENSE("GPL"); |
| 676 | MODULE_DEVICE_TABLE(pnp, gmux_device_ids); |