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> |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 6 | * Copyright (C) 2015 Lukas Wunner <lukas@wunner.de> |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 14 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/backlight.h> |
| 19 | #include <linux/acpi.h> |
| 20 | #include <linux/pnp.h> |
| 21 | #include <linux/apple_bl.h> |
Lukas Wunner | 2413306 | 2016-01-11 20:09:20 +0100 | [diff] [blame] | 22 | #include <linux/apple-gmux.h> |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 23 | #include <linux/slab.h> |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 24 | #include <linux/delay.h> |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 25 | #include <linux/pci.h> |
| 26 | #include <linux/vga_switcheroo.h> |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 27 | #include <linux/vgaarb.h> |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 28 | #include <acpi/video.h> |
| 29 | #include <asm/io.h> |
| 30 | |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 31 | /** |
| 32 | * DOC: Overview |
| 33 | * |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 34 | * gmux is a microcontroller built into the MacBook Pro to support dual GPUs: |
Lukas Wunner | 305964b | 2016-07-04 12:40:35 +0200 | [diff] [blame] | 35 | * A `Lattice XP2`_ on pre-retinas, a `Renesas R4F2113`_ on retinas. |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 36 | * |
| 37 | * (The MacPro6,1 2013 also has a gmux, however it is unclear why since it has |
| 38 | * dual GPUs but no built-in display.) |
| 39 | * |
| 40 | * gmux is connected to the LPC bus of the southbridge. Its I/O ports are |
| 41 | * accessed differently depending on the microcontroller: Driver functions |
Lukas Wunner | 305964b | 2016-07-04 12:40:35 +0200 | [diff] [blame] | 42 | * to access a pre-retina gmux are infixed ``_pio_``, those for a retina gmux |
| 43 | * are infixed ``_index_``. |
| 44 | * |
| 45 | * .. _Lattice XP2: |
| 46 | * http://www.latticesemi.com/en/Products/FPGAandCPLD/LatticeXP2.aspx |
| 47 | * .. _Renesas R4F2113: |
| 48 | * http://www.renesas.com/products/mpumcu/h8s/h8s2100/h8s2113/index.jsp |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 49 | */ |
| 50 | |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 51 | struct apple_gmux_data { |
| 52 | unsigned long iostart; |
| 53 | unsigned long iolen; |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 54 | bool indexed; |
| 55 | struct mutex index_lock; |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 56 | |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 57 | struct pci_dev *pdev; |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 58 | struct backlight_device *bdev; |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 59 | |
| 60 | /* switcheroo data */ |
| 61 | acpi_handle dhandle; |
| 62 | int gpe; |
Lukas Wunner | 3e46304 | 2016-01-11 20:09:20 +0100 | [diff] [blame] | 63 | enum vga_switcheroo_client_id switch_state_display; |
| 64 | enum vga_switcheroo_client_id switch_state_ddc; |
| 65 | enum vga_switcheroo_client_id switch_state_external; |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 66 | enum vga_switcheroo_state power_state; |
| 67 | struct completion powerchange_done; |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 68 | }; |
| 69 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 70 | static struct apple_gmux_data *apple_gmux_data; |
| 71 | |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 72 | /* |
| 73 | * gmux port offsets. Many of these are not yet used, but may be in the |
| 74 | * future, and it's useful to have them documented here anyhow. |
| 75 | */ |
| 76 | #define GMUX_PORT_VERSION_MAJOR 0x04 |
| 77 | #define GMUX_PORT_VERSION_MINOR 0x05 |
| 78 | #define GMUX_PORT_VERSION_RELEASE 0x06 |
| 79 | #define GMUX_PORT_SWITCH_DISPLAY 0x10 |
| 80 | #define GMUX_PORT_SWITCH_GET_DISPLAY 0x11 |
| 81 | #define GMUX_PORT_INTERRUPT_ENABLE 0x14 |
| 82 | #define GMUX_PORT_INTERRUPT_STATUS 0x16 |
| 83 | #define GMUX_PORT_SWITCH_DDC 0x28 |
| 84 | #define GMUX_PORT_SWITCH_EXTERNAL 0x40 |
| 85 | #define GMUX_PORT_SWITCH_GET_EXTERNAL 0x41 |
| 86 | #define GMUX_PORT_DISCRETE_POWER 0x50 |
| 87 | #define GMUX_PORT_MAX_BRIGHTNESS 0x70 |
| 88 | #define GMUX_PORT_BRIGHTNESS 0x74 |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 89 | #define GMUX_PORT_VALUE 0xc2 |
| 90 | #define GMUX_PORT_READ 0xd0 |
| 91 | #define GMUX_PORT_WRITE 0xd4 |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 92 | |
| 93 | #define GMUX_MIN_IO_LEN (GMUX_PORT_BRIGHTNESS + 4) |
| 94 | |
| 95 | #define GMUX_INTERRUPT_ENABLE 0xff |
| 96 | #define GMUX_INTERRUPT_DISABLE 0x00 |
| 97 | |
| 98 | #define GMUX_INTERRUPT_STATUS_ACTIVE 0 |
| 99 | #define GMUX_INTERRUPT_STATUS_DISPLAY (1 << 0) |
| 100 | #define GMUX_INTERRUPT_STATUS_POWER (1 << 2) |
| 101 | #define GMUX_INTERRUPT_STATUS_HOTPLUG (1 << 3) |
| 102 | |
| 103 | #define GMUX_BRIGHTNESS_MASK 0x00ffffff |
| 104 | #define GMUX_MAX_BRIGHTNESS GMUX_BRIGHTNESS_MASK |
| 105 | |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 106 | 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] | 107 | { |
| 108 | return inb(gmux_data->iostart + port); |
| 109 | } |
| 110 | |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 111 | 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] | 112 | u8 val) |
| 113 | { |
| 114 | outb(val, gmux_data->iostart + port); |
| 115 | } |
| 116 | |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 117 | 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] | 118 | { |
| 119 | return inl(gmux_data->iostart + port); |
| 120 | } |
| 121 | |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 122 | static void gmux_pio_write32(struct apple_gmux_data *gmux_data, int port, |
| 123 | u32 val) |
Matthew Garrett | 7e30ed6 | 2012-08-09 12:47:00 -0400 | [diff] [blame] | 124 | { |
| 125 | int i; |
| 126 | u8 tmpval; |
| 127 | |
| 128 | for (i = 0; i < 4; i++) { |
| 129 | tmpval = (val >> (i * 8)) & 0xff; |
Seth Forshee | e6d9d3d | 2012-08-21 21:56:49 -0500 | [diff] [blame] | 130 | outb(tmpval, gmux_data->iostart + port + i); |
Matthew Garrett | 7e30ed6 | 2012-08-09 12:47:00 -0400 | [diff] [blame] | 131 | } |
| 132 | } |
| 133 | |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 134 | static int gmux_index_wait_ready(struct apple_gmux_data *gmux_data) |
| 135 | { |
| 136 | int i = 200; |
| 137 | u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); |
| 138 | |
| 139 | while (i && (gwr & 0x01)) { |
| 140 | inb(gmux_data->iostart + GMUX_PORT_READ); |
| 141 | gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); |
| 142 | udelay(100); |
| 143 | i--; |
| 144 | } |
| 145 | |
| 146 | return !!i; |
| 147 | } |
| 148 | |
| 149 | static int gmux_index_wait_complete(struct apple_gmux_data *gmux_data) |
| 150 | { |
| 151 | int i = 200; |
| 152 | u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); |
| 153 | |
| 154 | while (i && !(gwr & 0x01)) { |
| 155 | gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); |
| 156 | udelay(100); |
| 157 | i--; |
| 158 | } |
| 159 | |
| 160 | if (gwr & 0x01) |
| 161 | inb(gmux_data->iostart + GMUX_PORT_READ); |
| 162 | |
| 163 | return !!i; |
| 164 | } |
| 165 | |
| 166 | static u8 gmux_index_read8(struct apple_gmux_data *gmux_data, int port) |
| 167 | { |
| 168 | u8 val; |
| 169 | |
| 170 | mutex_lock(&gmux_data->index_lock); |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 171 | gmux_index_wait_ready(gmux_data); |
Bernhard Froemel | c5a5052 | 2012-08-25 10:30:48 +0200 | [diff] [blame] | 172 | outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ); |
| 173 | gmux_index_wait_complete(gmux_data); |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 174 | val = inb(gmux_data->iostart + GMUX_PORT_VALUE); |
| 175 | mutex_unlock(&gmux_data->index_lock); |
| 176 | |
| 177 | return val; |
| 178 | } |
| 179 | |
| 180 | static void gmux_index_write8(struct apple_gmux_data *gmux_data, int port, |
| 181 | u8 val) |
| 182 | { |
| 183 | mutex_lock(&gmux_data->index_lock); |
| 184 | outb(val, gmux_data->iostart + GMUX_PORT_VALUE); |
| 185 | gmux_index_wait_ready(gmux_data); |
| 186 | outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE); |
| 187 | gmux_index_wait_complete(gmux_data); |
| 188 | mutex_unlock(&gmux_data->index_lock); |
| 189 | } |
| 190 | |
| 191 | static u32 gmux_index_read32(struct apple_gmux_data *gmux_data, int port) |
| 192 | { |
| 193 | u32 val; |
| 194 | |
| 195 | mutex_lock(&gmux_data->index_lock); |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 196 | gmux_index_wait_ready(gmux_data); |
Bernhard Froemel | c5a5052 | 2012-08-25 10:30:48 +0200 | [diff] [blame] | 197 | outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ); |
| 198 | gmux_index_wait_complete(gmux_data); |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 199 | val = inl(gmux_data->iostart + GMUX_PORT_VALUE); |
| 200 | mutex_unlock(&gmux_data->index_lock); |
| 201 | |
| 202 | return val; |
| 203 | } |
| 204 | |
| 205 | static void gmux_index_write32(struct apple_gmux_data *gmux_data, int port, |
| 206 | u32 val) |
| 207 | { |
| 208 | int i; |
| 209 | u8 tmpval; |
| 210 | |
| 211 | mutex_lock(&gmux_data->index_lock); |
| 212 | |
| 213 | for (i = 0; i < 4; i++) { |
| 214 | tmpval = (val >> (i * 8)) & 0xff; |
| 215 | outb(tmpval, gmux_data->iostart + GMUX_PORT_VALUE + i); |
| 216 | } |
| 217 | |
| 218 | gmux_index_wait_ready(gmux_data); |
| 219 | outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE); |
| 220 | gmux_index_wait_complete(gmux_data); |
| 221 | mutex_unlock(&gmux_data->index_lock); |
| 222 | } |
| 223 | |
| 224 | static u8 gmux_read8(struct apple_gmux_data *gmux_data, int port) |
| 225 | { |
| 226 | if (gmux_data->indexed) |
| 227 | return gmux_index_read8(gmux_data, port); |
| 228 | else |
| 229 | return gmux_pio_read8(gmux_data, port); |
| 230 | } |
| 231 | |
| 232 | static void gmux_write8(struct apple_gmux_data *gmux_data, int port, u8 val) |
| 233 | { |
| 234 | if (gmux_data->indexed) |
| 235 | gmux_index_write8(gmux_data, port, val); |
| 236 | else |
| 237 | gmux_pio_write8(gmux_data, port, val); |
| 238 | } |
| 239 | |
| 240 | static u32 gmux_read32(struct apple_gmux_data *gmux_data, int port) |
| 241 | { |
| 242 | if (gmux_data->indexed) |
| 243 | return gmux_index_read32(gmux_data, port); |
| 244 | else |
| 245 | return gmux_pio_read32(gmux_data, port); |
| 246 | } |
| 247 | |
| 248 | static void gmux_write32(struct apple_gmux_data *gmux_data, int port, |
| 249 | u32 val) |
| 250 | { |
| 251 | if (gmux_data->indexed) |
| 252 | gmux_index_write32(gmux_data, port, val); |
| 253 | else |
| 254 | gmux_pio_write32(gmux_data, port, val); |
| 255 | } |
| 256 | |
| 257 | static bool gmux_is_indexed(struct apple_gmux_data *gmux_data) |
| 258 | { |
| 259 | u16 val; |
| 260 | |
| 261 | outb(0xaa, gmux_data->iostart + 0xcc); |
| 262 | outb(0x55, gmux_data->iostart + 0xcd); |
| 263 | outb(0x00, gmux_data->iostart + 0xce); |
| 264 | |
| 265 | val = inb(gmux_data->iostart + 0xcc) | |
| 266 | (inb(gmux_data->iostart + 0xcd) << 8); |
| 267 | |
| 268 | if (val == 0x55aa) |
| 269 | return true; |
| 270 | |
| 271 | return false; |
| 272 | } |
| 273 | |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 274 | /** |
| 275 | * DOC: Backlight control |
| 276 | * |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 277 | * On single GPU MacBooks, the PWM signal for the backlight is generated by |
| 278 | * the GPU. On dual GPU MacBook Pros by contrast, either GPU may be suspended |
| 279 | * to conserve energy. Hence the PWM signal needs to be generated by a separate |
| 280 | * backlight driver which is controlled by gmux. The earliest generation |
Lukas Wunner | 305964b | 2016-07-04 12:40:35 +0200 | [diff] [blame] | 281 | * MBP5 2008/09 uses a `TI LP8543`_ backlight driver. All newer models |
| 282 | * use a `TI LP8545`_. |
| 283 | * |
| 284 | * .. _TI LP8543: http://www.ti.com/lit/ds/symlink/lp8543.pdf |
| 285 | * .. _TI LP8545: http://www.ti.com/lit/ds/symlink/lp8545.pdf |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 286 | */ |
| 287 | |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 288 | static int gmux_get_brightness(struct backlight_device *bd) |
| 289 | { |
| 290 | struct apple_gmux_data *gmux_data = bl_get_data(bd); |
| 291 | return gmux_read32(gmux_data, GMUX_PORT_BRIGHTNESS) & |
| 292 | GMUX_BRIGHTNESS_MASK; |
| 293 | } |
| 294 | |
| 295 | static int gmux_update_status(struct backlight_device *bd) |
| 296 | { |
| 297 | struct apple_gmux_data *gmux_data = bl_get_data(bd); |
| 298 | u32 brightness = bd->props.brightness; |
| 299 | |
Seth Forshee | 9696088 | 2012-04-19 10:55:35 -0500 | [diff] [blame] | 300 | if (bd->props.state & BL_CORE_SUSPENDED) |
Matthew Garrett | a2f01a8 | 2012-06-01 15:18:52 -0400 | [diff] [blame] | 301 | return 0; |
Seth Forshee | 9696088 | 2012-04-19 10:55:35 -0500 | [diff] [blame] | 302 | |
Matthew Garrett | 7e30ed6 | 2012-08-09 12:47:00 -0400 | [diff] [blame] | 303 | gmux_write32(gmux_data, GMUX_PORT_BRIGHTNESS, brightness); |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 304 | |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | static const struct backlight_ops gmux_bl_ops = { |
Seth Forshee | 9696088 | 2012-04-19 10:55:35 -0500 | [diff] [blame] | 309 | .options = BL_CORE_SUSPENDRESUME, |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 310 | .get_brightness = gmux_get_brightness, |
| 311 | .update_status = gmux_update_status, |
| 312 | }; |
| 313 | |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 314 | /** |
| 315 | * DOC: Graphics mux |
| 316 | * |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 317 | * On pre-retinas, the LVDS outputs of both GPUs feed into gmux which muxes |
| 318 | * either of them to the panel. One of the tricks gmux has up its sleeve is |
| 319 | * to lengthen the blanking interval of its output during a switch to |
| 320 | * synchronize it with the GPU switched to. This allows for a flicker-free |
Lukas Wunner | 305964b | 2016-07-04 12:40:35 +0200 | [diff] [blame] | 321 | * switch that is imperceptible by the user (`US 8,687,007 B2`_). |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 322 | * |
| 323 | * On retinas, muxing is no longer done by gmux itself, but by a separate |
| 324 | * chip which is controlled by gmux. The chip is triple sourced, it is |
Lukas Wunner | 305964b | 2016-07-04 12:40:35 +0200 | [diff] [blame] | 325 | * either an `NXP CBTL06142`_, `TI HD3SS212`_ or `Pericom PI3VDP12412`_. |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 326 | * The panel is driven with eDP instead of LVDS since the pixel clock |
| 327 | * required for retina resolution exceeds LVDS' limits. |
| 328 | * |
| 329 | * Pre-retinas are able to switch the panel's DDC pins separately. |
Lukas Wunner | 305964b | 2016-07-04 12:40:35 +0200 | [diff] [blame] | 330 | * This is handled by a `TI SN74LV4066A`_ which is controlled by gmux. |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 331 | * The inactive GPU can thus probe the panel's EDID without switching over |
| 332 | * the entire panel. Retinas lack this functionality as the chips used for |
| 333 | * eDP muxing are incapable of switching the AUX channel separately (see |
| 334 | * the linked data sheets, Pericom would be capable but this is unused). |
| 335 | * However the retina panel has the NO_AUX_HANDSHAKE_LINK_TRAINING bit set |
| 336 | * in its DPCD, allowing the inactive GPU to skip the AUX handshake and |
| 337 | * set up the output with link parameters pre-calibrated by the active GPU. |
| 338 | * |
| 339 | * The external DP port is only fully switchable on the first two unibody |
| 340 | * MacBook Pro generations, MBP5 2008/09 and MBP6 2010. This is done by an |
Lukas Wunner | 305964b | 2016-07-04 12:40:35 +0200 | [diff] [blame] | 341 | * `NXP CBTL06141`_ which is controlled by gmux. It's the predecessor of the |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 342 | * eDP mux on retinas, the difference being support for 2.7 versus 5.4 Gbit/s. |
| 343 | * |
| 344 | * The following MacBook Pro generations replaced the external DP port with a |
| 345 | * combined DP/Thunderbolt port and lost the ability to switch it between GPUs, |
| 346 | * connecting it either to the discrete GPU or the Thunderbolt controller. |
| 347 | * Oddly enough, while the full port is no longer switchable, AUX and HPD |
Lukas Wunner | 305964b | 2016-07-04 12:40:35 +0200 | [diff] [blame] | 348 | * are still switchable by way of an `NXP CBTL03062`_ (on pre-retinas |
| 349 | * MBP8 2011 and MBP9 2012) or two `TI TS3DS10224`_ (on retinas) under the |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 350 | * control of gmux. Since the integrated GPU is missing the main link, |
| 351 | * external displays appear to it as phantoms which fail to link-train. |
| 352 | * |
| 353 | * gmux receives the HPD signal of all display connectors and sends an |
| 354 | * interrupt on hotplug. On generations which cannot switch external ports, |
| 355 | * the discrete GPU can then be woken to drive the newly connected display. |
| 356 | * The ability to switch AUX on these generations could be used to improve |
| 357 | * reliability of hotplug detection by having the integrated GPU poll the |
| 358 | * ports while the discrete GPU is asleep, but currently we do not make use |
| 359 | * of this feature. |
| 360 | * |
| 361 | * gmux' initial switch state on bootup is user configurable via the EFI |
Lukas Wunner | 305964b | 2016-07-04 12:40:35 +0200 | [diff] [blame] | 362 | * variable ``gpu-power-prefs-fa4ce28d-b62f-4c99-9cc3-6815686e30f9`` (5th byte, |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 363 | * 1 = IGD, 0 = DIS). Based on this setting, the EFI firmware tells gmux to |
| 364 | * switch the panel and the external DP connector and allocates a framebuffer |
| 365 | * for the selected GPU. |
Lukas Wunner | 305964b | 2016-07-04 12:40:35 +0200 | [diff] [blame] | 366 | * |
| 367 | * .. _US 8,687,007 B2: http://pimg-fpiw.uspto.gov/fdd/07/870/086/0.pdf |
| 368 | * .. _NXP CBTL06141: http://www.nxp.com/documents/data_sheet/CBTL06141.pdf |
| 369 | * .. _NXP CBTL06142: http://www.nxp.com/documents/data_sheet/CBTL06141.pdf |
| 370 | * .. _TI HD3SS212: http://www.ti.com/lit/ds/symlink/hd3ss212.pdf |
| 371 | * .. _Pericom PI3VDP12412: https://www.pericom.com/assets/Datasheets/PI3VDP12412.pdf |
| 372 | * .. _TI SN74LV4066A: http://www.ti.com/lit/ds/symlink/sn74lv4066a.pdf |
| 373 | * .. _NXP CBTL03062: http://pdf.datasheetarchive.com/indexerfiles/Datasheets-SW16/DSASW00308511.pdf |
| 374 | * .. _TI TS3DS10224: http://www.ti.com/lit/ds/symlink/ts3ds10224.pdf |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 375 | */ |
| 376 | |
Lukas Wunner | 3e46304 | 2016-01-11 20:09:20 +0100 | [diff] [blame] | 377 | static void gmux_read_switch_state(struct apple_gmux_data *gmux_data) |
| 378 | { |
| 379 | if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_DDC) == 1) |
| 380 | gmux_data->switch_state_ddc = VGA_SWITCHEROO_IGD; |
| 381 | else |
| 382 | gmux_data->switch_state_ddc = VGA_SWITCHEROO_DIS; |
| 383 | |
| 384 | if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_DISPLAY) == 2) |
| 385 | gmux_data->switch_state_display = VGA_SWITCHEROO_IGD; |
| 386 | else |
| 387 | gmux_data->switch_state_display = VGA_SWITCHEROO_DIS; |
| 388 | |
| 389 | if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL) == 2) |
| 390 | gmux_data->switch_state_external = VGA_SWITCHEROO_IGD; |
| 391 | else |
| 392 | gmux_data->switch_state_external = VGA_SWITCHEROO_DIS; |
| 393 | } |
| 394 | |
| 395 | static void gmux_write_switch_state(struct apple_gmux_data *gmux_data) |
| 396 | { |
| 397 | if (gmux_data->switch_state_ddc == VGA_SWITCHEROO_IGD) |
| 398 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_DDC, 1); |
| 399 | else |
| 400 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_DDC, 2); |
| 401 | |
| 402 | if (gmux_data->switch_state_display == VGA_SWITCHEROO_IGD) |
| 403 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_DISPLAY, 2); |
| 404 | else |
| 405 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_DISPLAY, 3); |
| 406 | |
| 407 | if (gmux_data->switch_state_external == VGA_SWITCHEROO_IGD) |
| 408 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 2); |
| 409 | else |
| 410 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 3); |
| 411 | } |
| 412 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 413 | static int gmux_switchto(enum vga_switcheroo_client_id id) |
| 414 | { |
Lukas Wunner | 3e46304 | 2016-01-11 20:09:20 +0100 | [diff] [blame] | 415 | apple_gmux_data->switch_state_ddc = id; |
| 416 | apple_gmux_data->switch_state_display = id; |
| 417 | apple_gmux_data->switch_state_external = id; |
| 418 | |
| 419 | gmux_write_switch_state(apple_gmux_data); |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 420 | |
| 421 | return 0; |
| 422 | } |
| 423 | |
Lukas Wunner | f798d96 | 2016-01-11 20:09:20 +0100 | [diff] [blame] | 424 | static int gmux_switch_ddc(enum vga_switcheroo_client_id id) |
| 425 | { |
| 426 | enum vga_switcheroo_client_id old_ddc_owner = |
| 427 | apple_gmux_data->switch_state_ddc; |
| 428 | |
| 429 | if (id == old_ddc_owner) |
| 430 | return id; |
| 431 | |
| 432 | pr_debug("Switching DDC from %d to %d\n", old_ddc_owner, id); |
| 433 | apple_gmux_data->switch_state_ddc = id; |
| 434 | |
| 435 | if (id == VGA_SWITCHEROO_IGD) |
| 436 | gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 1); |
| 437 | else |
| 438 | gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 2); |
| 439 | |
| 440 | return old_ddc_owner; |
| 441 | } |
| 442 | |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 443 | /** |
| 444 | * DOC: Power control |
| 445 | * |
| 446 | * gmux is able to cut power to the discrete GPU. It automatically takes care |
| 447 | * of the correct sequence to tear down and bring up the power rails for |
| 448 | * core voltage, VRAM and PCIe. |
| 449 | */ |
| 450 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 451 | static int gmux_set_discrete_state(struct apple_gmux_data *gmux_data, |
| 452 | enum vga_switcheroo_state state) |
| 453 | { |
Wolfram Sang | 16735d0 | 2013-11-14 14:32:02 -0800 | [diff] [blame] | 454 | reinit_completion(&gmux_data->powerchange_done); |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 455 | |
| 456 | if (state == VGA_SWITCHEROO_ON) { |
| 457 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 1); |
| 458 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 3); |
| 459 | pr_debug("Discrete card powered up\n"); |
| 460 | } else { |
| 461 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 1); |
| 462 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 0); |
| 463 | pr_debug("Discrete card powered down\n"); |
| 464 | } |
| 465 | |
| 466 | gmux_data->power_state = state; |
| 467 | |
| 468 | if (gmux_data->gpe >= 0 && |
| 469 | !wait_for_completion_interruptible_timeout(&gmux_data->powerchange_done, |
| 470 | msecs_to_jiffies(200))) |
| 471 | pr_warn("Timeout waiting for gmux switch to complete\n"); |
| 472 | |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | static int gmux_set_power_state(enum vga_switcheroo_client_id id, |
| 477 | enum vga_switcheroo_state state) |
| 478 | { |
| 479 | if (id == VGA_SWITCHEROO_IGD) |
| 480 | return 0; |
| 481 | |
| 482 | return gmux_set_discrete_state(apple_gmux_data, state); |
| 483 | } |
| 484 | |
| 485 | static int gmux_get_client_id(struct pci_dev *pdev) |
| 486 | { |
| 487 | /* |
| 488 | * Early Macbook Pros with switchable graphics use nvidia |
| 489 | * integrated graphics. Hardcode that the 9400M is integrated. |
| 490 | */ |
| 491 | if (pdev->vendor == PCI_VENDOR_ID_INTEL) |
| 492 | return VGA_SWITCHEROO_IGD; |
| 493 | else if (pdev->vendor == PCI_VENDOR_ID_NVIDIA && |
| 494 | pdev->device == 0x0863) |
| 495 | return VGA_SWITCHEROO_IGD; |
| 496 | else |
| 497 | return VGA_SWITCHEROO_DIS; |
| 498 | } |
| 499 | |
Lukas Wunner | f798d96 | 2016-01-11 20:09:20 +0100 | [diff] [blame] | 500 | static const struct vga_switcheroo_handler gmux_handler_indexed = { |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 501 | .switchto = gmux_switchto, |
| 502 | .power_state = gmux_set_power_state, |
| 503 | .get_client_id = gmux_get_client_id, |
| 504 | }; |
| 505 | |
Lukas Wunner | f798d96 | 2016-01-11 20:09:20 +0100 | [diff] [blame] | 506 | static const struct vga_switcheroo_handler gmux_handler_classic = { |
| 507 | .switchto = gmux_switchto, |
| 508 | .switch_ddc = gmux_switch_ddc, |
| 509 | .power_state = gmux_set_power_state, |
| 510 | .get_client_id = gmux_get_client_id, |
| 511 | }; |
| 512 | |
Lukas Wunner | 3d7b75f | 2016-01-11 00:08:35 +0100 | [diff] [blame] | 513 | /** |
| 514 | * DOC: Interrupt |
| 515 | * |
| 516 | * gmux is also connected to a GPIO pin of the southbridge and thereby is able |
| 517 | * to trigger an ACPI GPE. On the MBP5 2008/09 it's GPIO pin 22 of the Nvidia |
| 518 | * MCP79, on all following generations it's GPIO pin 6 of the Intel PCH. |
| 519 | * The GPE merely signals that an interrupt occurred, the actual type of event |
| 520 | * is identified by reading a gmux register. |
| 521 | */ |
| 522 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 523 | static inline void gmux_disable_interrupts(struct apple_gmux_data *gmux_data) |
| 524 | { |
| 525 | gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE, |
| 526 | GMUX_INTERRUPT_DISABLE); |
| 527 | } |
| 528 | |
| 529 | static inline void gmux_enable_interrupts(struct apple_gmux_data *gmux_data) |
| 530 | { |
| 531 | gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE, |
| 532 | GMUX_INTERRUPT_ENABLE); |
| 533 | } |
| 534 | |
| 535 | static inline u8 gmux_interrupt_get_status(struct apple_gmux_data *gmux_data) |
| 536 | { |
| 537 | return gmux_read8(gmux_data, GMUX_PORT_INTERRUPT_STATUS); |
| 538 | } |
| 539 | |
| 540 | static void gmux_clear_interrupts(struct apple_gmux_data *gmux_data) |
| 541 | { |
| 542 | u8 status; |
| 543 | |
| 544 | /* to clear interrupts write back current status */ |
| 545 | status = gmux_interrupt_get_status(gmux_data); |
| 546 | gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_STATUS, status); |
| 547 | } |
| 548 | |
| 549 | static void gmux_notify_handler(acpi_handle device, u32 value, void *context) |
| 550 | { |
| 551 | u8 status; |
| 552 | struct pnp_dev *pnp = (struct pnp_dev *)context; |
| 553 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); |
| 554 | |
| 555 | status = gmux_interrupt_get_status(gmux_data); |
| 556 | gmux_disable_interrupts(gmux_data); |
| 557 | pr_debug("Notify handler called: status %d\n", status); |
| 558 | |
| 559 | gmux_clear_interrupts(gmux_data); |
| 560 | gmux_enable_interrupts(gmux_data); |
| 561 | |
| 562 | if (status & GMUX_INTERRUPT_STATUS_POWER) |
| 563 | complete(&gmux_data->powerchange_done); |
| 564 | } |
| 565 | |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 566 | static int gmux_suspend(struct device *dev) |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 567 | { |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 568 | struct pnp_dev *pnp = to_pnp_dev(dev); |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 569 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 570 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 571 | gmux_disable_interrupts(gmux_data); |
| 572 | return 0; |
| 573 | } |
| 574 | |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 575 | static int gmux_resume(struct device *dev) |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 576 | { |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 577 | struct pnp_dev *pnp = to_pnp_dev(dev); |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 578 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 579 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 580 | gmux_enable_interrupts(gmux_data); |
Lukas Wunner | 3e46304 | 2016-01-11 20:09:20 +0100 | [diff] [blame] | 581 | gmux_write_switch_state(gmux_data); |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 582 | if (gmux_data->power_state == VGA_SWITCHEROO_OFF) |
| 583 | gmux_set_discrete_state(gmux_data, gmux_data->power_state); |
| 584 | return 0; |
| 585 | } |
| 586 | |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 587 | static struct pci_dev *gmux_get_io_pdev(void) |
| 588 | { |
| 589 | struct pci_dev *pdev = NULL; |
| 590 | |
| 591 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev))) { |
| 592 | u16 cmd; |
| 593 | |
| 594 | pci_read_config_word(pdev, PCI_COMMAND, &cmd); |
| 595 | if (!(cmd & PCI_COMMAND_IO)) |
| 596 | continue; |
| 597 | |
| 598 | return pdev; |
| 599 | } |
| 600 | |
| 601 | return NULL; |
| 602 | } |
| 603 | |
Greg Kroah-Hartman | b859f15 | 2012-12-21 13:18:33 -0800 | [diff] [blame] | 604 | 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] | 605 | { |
| 606 | struct apple_gmux_data *gmux_data; |
| 607 | struct resource *res; |
| 608 | struct backlight_properties props; |
| 609 | struct backlight_device *bdev; |
| 610 | u8 ver_major, ver_minor, ver_release; |
| 611 | int ret = -ENXIO; |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 612 | acpi_status status; |
| 613 | unsigned long long gpe; |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 614 | struct pci_dev *pdev = NULL; |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 615 | |
| 616 | if (apple_gmux_data) |
| 617 | return -EBUSY; |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 618 | |
| 619 | gmux_data = kzalloc(sizeof(*gmux_data), GFP_KERNEL); |
| 620 | if (!gmux_data) |
| 621 | return -ENOMEM; |
| 622 | pnp_set_drvdata(pnp, gmux_data); |
| 623 | |
| 624 | res = pnp_get_resource(pnp, IORESOURCE_IO, 0); |
| 625 | if (!res) { |
| 626 | pr_err("Failed to find gmux I/O resource\n"); |
| 627 | goto err_free; |
| 628 | } |
| 629 | |
| 630 | gmux_data->iostart = res->start; |
| 631 | gmux_data->iolen = res->end - res->start; |
| 632 | |
| 633 | if (gmux_data->iolen < GMUX_MIN_IO_LEN) { |
| 634 | pr_err("gmux I/O region too small (%lu < %u)\n", |
| 635 | gmux_data->iolen, GMUX_MIN_IO_LEN); |
| 636 | goto err_free; |
| 637 | } |
| 638 | |
| 639 | if (!request_region(gmux_data->iostart, gmux_data->iolen, |
| 640 | "Apple gmux")) { |
| 641 | pr_err("gmux I/O already in use\n"); |
| 642 | goto err_free; |
| 643 | } |
| 644 | |
| 645 | /* |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 646 | * Invalid version information may indicate either that the gmux |
| 647 | * device isn't present or that it's a new one that uses indexed |
| 648 | * io |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 649 | */ |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 650 | |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 651 | ver_major = gmux_read8(gmux_data, GMUX_PORT_VERSION_MAJOR); |
| 652 | ver_minor = gmux_read8(gmux_data, GMUX_PORT_VERSION_MINOR); |
| 653 | ver_release = gmux_read8(gmux_data, GMUX_PORT_VERSION_RELEASE); |
| 654 | if (ver_major == 0xff && ver_minor == 0xff && ver_release == 0xff) { |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 655 | if (gmux_is_indexed(gmux_data)) { |
Bernhard Froemel | 07f377d | 2012-08-25 10:30:49 +0200 | [diff] [blame] | 656 | u32 version; |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 657 | mutex_init(&gmux_data->index_lock); |
| 658 | gmux_data->indexed = true; |
Bernhard Froemel | 07f377d | 2012-08-25 10:30:49 +0200 | [diff] [blame] | 659 | version = gmux_read32(gmux_data, |
| 660 | GMUX_PORT_VERSION_MAJOR); |
| 661 | ver_major = (version >> 24) & 0xff; |
| 662 | ver_minor = (version >> 16) & 0xff; |
| 663 | ver_release = (version >> 8) & 0xff; |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 664 | } else { |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 665 | pr_info("gmux device not present or IO disabled\n"); |
Matthew Garrett | 96ff705 | 2012-08-09 13:45:01 -0400 | [diff] [blame] | 666 | ret = -ENODEV; |
| 667 | goto err_release; |
| 668 | } |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 669 | } |
Bernhard Froemel | 07f377d | 2012-08-25 10:30:49 +0200 | [diff] [blame] | 670 | pr_info("Found gmux version %d.%d.%d [%s]\n", ver_major, ver_minor, |
| 671 | ver_release, (gmux_data->indexed ? "indexed" : "classic")); |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 672 | |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 673 | /* |
| 674 | * Apple systems with gmux are EFI based and normally don't use |
| 675 | * VGA. In addition changing IO+MEM ownership between IGP and dGPU |
| 676 | * disables IO/MEM used for backlight control on some systems. |
| 677 | * Lock IO+MEM to GPU with active IO to prevent switch. |
| 678 | */ |
| 679 | pdev = gmux_get_io_pdev(); |
| 680 | if (pdev && vga_tryget(pdev, |
| 681 | VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM)) { |
| 682 | pr_err("IO+MEM vgaarb-locking for PCI:%s failed\n", |
| 683 | pci_name(pdev)); |
| 684 | ret = -EBUSY; |
| 685 | goto err_release; |
| 686 | } else if (pdev) |
| 687 | pr_info("locked IO for PCI:%s\n", pci_name(pdev)); |
| 688 | gmux_data->pdev = pdev; |
| 689 | |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 690 | memset(&props, 0, sizeof(props)); |
| 691 | props.type = BACKLIGHT_PLATFORM; |
| 692 | props.max_brightness = gmux_read32(gmux_data, GMUX_PORT_MAX_BRIGHTNESS); |
| 693 | |
| 694 | /* |
| 695 | * Currently it's assumed that the maximum brightness is less than |
| 696 | * 2^24 for compatibility with old gmux versions. Cap the max |
| 697 | * brightness at this value, but print a warning if the hardware |
| 698 | * reports something higher so that it can be fixed. |
| 699 | */ |
| 700 | if (WARN_ON(props.max_brightness > GMUX_MAX_BRIGHTNESS)) |
| 701 | props.max_brightness = GMUX_MAX_BRIGHTNESS; |
| 702 | |
| 703 | bdev = backlight_device_register("gmux_backlight", &pnp->dev, |
| 704 | gmux_data, &gmux_bl_ops, &props); |
| 705 | if (IS_ERR(bdev)) { |
| 706 | ret = PTR_ERR(bdev); |
| 707 | goto err_release; |
| 708 | } |
| 709 | |
| 710 | gmux_data->bdev = bdev; |
| 711 | bdev->props.brightness = gmux_get_brightness(bdev); |
| 712 | backlight_update_status(bdev); |
| 713 | |
| 714 | /* |
| 715 | * The backlight situation on Macs is complicated. If the gmux is |
| 716 | * present it's the best choice, because it always works for |
| 717 | * backlight control and supports more levels than other options. |
| 718 | * Disable the other backlight choices. |
| 719 | */ |
Hans de Goede | 86ac056 | 2015-06-16 16:27:56 +0200 | [diff] [blame] | 720 | acpi_video_set_dmi_backlight_type(acpi_backlight_vendor); |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 721 | apple_bl_unregister(); |
| 722 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 723 | gmux_data->power_state = VGA_SWITCHEROO_ON; |
| 724 | |
Rafael J. Wysocki | 3a83f99 | 2013-11-14 23:17:21 +0100 | [diff] [blame] | 725 | gmux_data->dhandle = ACPI_HANDLE(&pnp->dev); |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 726 | if (!gmux_data->dhandle) { |
| 727 | pr_err("Cannot find acpi handle for pnp device %s\n", |
| 728 | dev_name(&pnp->dev)); |
| 729 | ret = -ENODEV; |
| 730 | goto err_notify; |
| 731 | } |
| 732 | |
| 733 | status = acpi_evaluate_integer(gmux_data->dhandle, "GMGP", NULL, &gpe); |
| 734 | if (ACPI_SUCCESS(status)) { |
| 735 | gmux_data->gpe = (int)gpe; |
| 736 | |
| 737 | status = acpi_install_notify_handler(gmux_data->dhandle, |
| 738 | ACPI_DEVICE_NOTIFY, |
| 739 | &gmux_notify_handler, pnp); |
| 740 | if (ACPI_FAILURE(status)) { |
| 741 | pr_err("Install notify handler failed: %s\n", |
| 742 | acpi_format_exception(status)); |
| 743 | ret = -ENODEV; |
| 744 | goto err_notify; |
| 745 | } |
| 746 | |
| 747 | status = acpi_enable_gpe(NULL, gmux_data->gpe); |
| 748 | if (ACPI_FAILURE(status)) { |
| 749 | pr_err("Cannot enable gpe: %s\n", |
| 750 | acpi_format_exception(status)); |
| 751 | goto err_enable_gpe; |
| 752 | } |
| 753 | } else { |
| 754 | pr_warn("No GPE found for gmux\n"); |
| 755 | gmux_data->gpe = -1; |
| 756 | } |
| 757 | |
Matthew Garrett | c1e1655 | 2015-11-16 21:38:40 +0100 | [diff] [blame] | 758 | apple_gmux_data = gmux_data; |
| 759 | init_completion(&gmux_data->powerchange_done); |
| 760 | gmux_enable_interrupts(gmux_data); |
Lukas Wunner | 3e46304 | 2016-01-11 20:09:20 +0100 | [diff] [blame] | 761 | gmux_read_switch_state(gmux_data); |
Matthew Garrett | c1e1655 | 2015-11-16 21:38:40 +0100 | [diff] [blame] | 762 | |
Lukas Wunner | f798d96 | 2016-01-11 20:09:20 +0100 | [diff] [blame] | 763 | /* |
| 764 | * Retina MacBook Pros cannot switch the panel's AUX separately |
| 765 | * and need eDP pre-calibration. They are distinguishable from |
| 766 | * pre-retinas by having an "indexed" gmux. |
| 767 | * |
| 768 | * Pre-retina MacBook Pros can switch the panel's DDC separately. |
| 769 | */ |
| 770 | if (gmux_data->indexed) |
| 771 | ret = vga_switcheroo_register_handler(&gmux_handler_indexed, |
| 772 | VGA_SWITCHEROO_NEEDS_EDP_CONFIG); |
| 773 | else |
| 774 | ret = vga_switcheroo_register_handler(&gmux_handler_classic, |
| 775 | VGA_SWITCHEROO_CAN_SWITCH_DDC); |
| 776 | if (ret) { |
| 777 | pr_err("Failed to register vga_switcheroo handler\n"); |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 778 | goto err_register_handler; |
| 779 | } |
| 780 | |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 781 | return 0; |
| 782 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 783 | err_register_handler: |
Matthew Garrett | c1e1655 | 2015-11-16 21:38:40 +0100 | [diff] [blame] | 784 | gmux_disable_interrupts(gmux_data); |
| 785 | apple_gmux_data = NULL; |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 786 | if (gmux_data->gpe >= 0) |
| 787 | acpi_disable_gpe(NULL, gmux_data->gpe); |
| 788 | err_enable_gpe: |
| 789 | if (gmux_data->gpe >= 0) |
| 790 | acpi_remove_notify_handler(gmux_data->dhandle, |
| 791 | ACPI_DEVICE_NOTIFY, |
| 792 | &gmux_notify_handler); |
| 793 | err_notify: |
| 794 | backlight_device_unregister(bdev); |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 795 | err_release: |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 796 | if (gmux_data->pdev) |
| 797 | vga_put(gmux_data->pdev, |
| 798 | VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM); |
| 799 | pci_dev_put(pdev); |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 800 | release_region(gmux_data->iostart, gmux_data->iolen); |
| 801 | err_free: |
| 802 | kfree(gmux_data); |
| 803 | return ret; |
| 804 | } |
| 805 | |
Greg Kroah-Hartman | b859f15 | 2012-12-21 13:18:33 -0800 | [diff] [blame] | 806 | static void gmux_remove(struct pnp_dev *pnp) |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 807 | { |
| 808 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); |
| 809 | |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 810 | vga_switcheroo_unregister_handler(); |
| 811 | gmux_disable_interrupts(gmux_data); |
| 812 | if (gmux_data->gpe >= 0) { |
| 813 | acpi_disable_gpe(NULL, gmux_data->gpe); |
| 814 | acpi_remove_notify_handler(gmux_data->dhandle, |
| 815 | ACPI_DEVICE_NOTIFY, |
| 816 | &gmux_notify_handler); |
| 817 | } |
| 818 | |
Bruno Prémont | 4eebd5a | 2015-03-11 22:34:45 +0100 | [diff] [blame] | 819 | if (gmux_data->pdev) { |
| 820 | vga_put(gmux_data->pdev, |
| 821 | VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM); |
| 822 | pci_dev_put(gmux_data->pdev); |
| 823 | } |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 824 | backlight_device_unregister(gmux_data->bdev); |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 825 | |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 826 | release_region(gmux_data->iostart, gmux_data->iolen); |
Andreas Heider | 76b487d | 2012-08-17 11:17:04 -0500 | [diff] [blame] | 827 | apple_gmux_data = NULL; |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 828 | kfree(gmux_data); |
| 829 | |
| 830 | acpi_video_register(); |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 831 | apple_bl_register(); |
| 832 | } |
| 833 | |
| 834 | static const struct pnp_device_id gmux_device_ids[] = { |
Lukas Wunner | 2413306 | 2016-01-11 20:09:20 +0100 | [diff] [blame] | 835 | {GMUX_ACPI_HID, 0}, |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 836 | {"", 0} |
| 837 | }; |
| 838 | |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 839 | static const struct dev_pm_ops gmux_dev_pm_ops = { |
| 840 | .suspend = gmux_suspend, |
| 841 | .resume = gmux_resume, |
| 842 | }; |
| 843 | |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 844 | static struct pnp_driver gmux_pnp_driver = { |
| 845 | .name = "apple-gmux", |
| 846 | .probe = gmux_probe, |
Greg Kroah-Hartman | b859f15 | 2012-12-21 13:18:33 -0800 | [diff] [blame] | 847 | .remove = gmux_remove, |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 848 | .id_table = gmux_device_ids, |
Shuah Khan | 8aa6c21 | 2013-09-11 14:23:15 -0700 | [diff] [blame] | 849 | .driver = { |
| 850 | .pm = &gmux_dev_pm_ops, |
| 851 | }, |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 852 | }; |
| 853 | |
Peter Huewe | 99f74f1 | 2015-03-16 21:46:36 +0100 | [diff] [blame] | 854 | module_pnp_driver(gmux_pnp_driver); |
Seth Forshee | 917ee75 | 2012-03-16 14:41:22 -0500 | [diff] [blame] | 855 | MODULE_AUTHOR("Seth Forshee <seth.forshee@canonical.com>"); |
| 856 | MODULE_DESCRIPTION("Apple Gmux Driver"); |
| 857 | MODULE_LICENSE("GPL"); |
| 858 | MODULE_DEVICE_TABLE(pnp, gmux_device_ids); |