2010-02-01 12:38:10 +07:00
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/*
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* Copyright (c) 2010 Red Hat Inc.
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* Author : Dave Airlie <airlied@redhat.com>
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*
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* Licensed under GPLv2
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*
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* ATPX support for both Intel/ATI
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*/
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#include <linux/vga_switcheroo.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 15:04:11 +07:00
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#include <linux/slab.h>
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2010-02-01 12:38:10 +07:00
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#include <acpi/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <linux/pci.h>
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#define ATPX_VERSION 0
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#define ATPX_GPU_PWR 2
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#define ATPX_MUX_SELECT 3
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2011-05-06 12:42:49 +07:00
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#define ATPX_I2C_MUX_SELECT 4
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#define ATPX_SWITCH_START 5
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#define ATPX_SWITCH_END 6
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2010-02-01 12:38:10 +07:00
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#define ATPX_INTEGRATED 0
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#define ATPX_DISCRETE 1
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#define ATPX_MUX_IGD 0
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#define ATPX_MUX_DISCRETE 1
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static struct radeon_atpx_priv {
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bool atpx_detected;
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/* handle for device - and atpx */
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acpi_handle dhandle;
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acpi_handle atpx_handle;
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} radeon_atpx_priv;
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static int radeon_atpx_get_version(acpi_handle handle)
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{
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acpi_status status;
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union acpi_object atpx_arg_elements[2], *obj;
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struct acpi_object_list atpx_arg;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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atpx_arg.count = 2;
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atpx_arg.pointer = &atpx_arg_elements[0];
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atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
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atpx_arg_elements[0].integer.value = ATPX_VERSION;
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atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
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atpx_arg_elements[1].integer.value = ATPX_VERSION;
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status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
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if (ACPI_FAILURE(status)) {
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printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status));
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return -ENOSYS;
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}
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obj = (union acpi_object *)buffer.pointer;
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if (obj && (obj->type == ACPI_TYPE_BUFFER))
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printk(KERN_INFO "radeon atpx: version is %d\n", *((u8 *)(obj->buffer.pointer) + 2));
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kfree(buffer.pointer);
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return 0;
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}
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static int radeon_atpx_execute(acpi_handle handle, int cmd_id, u16 value)
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{
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acpi_status status;
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union acpi_object atpx_arg_elements[2];
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struct acpi_object_list atpx_arg;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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uint8_t buf[4] = {0};
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if (!handle)
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return -EINVAL;
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atpx_arg.count = 2;
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atpx_arg.pointer = &atpx_arg_elements[0];
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atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
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atpx_arg_elements[0].integer.value = cmd_id;
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buf[2] = value & 0xff;
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buf[3] = (value >> 8) & 0xff;
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atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
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atpx_arg_elements[1].buffer.length = 4;
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atpx_arg_elements[1].buffer.pointer = buf;
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status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
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if (ACPI_FAILURE(status)) {
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printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status));
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return -ENOSYS;
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}
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kfree(buffer.pointer);
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return 0;
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}
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static int radeon_atpx_set_discrete_state(acpi_handle handle, int state)
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{
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return radeon_atpx_execute(handle, ATPX_GPU_PWR, state);
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}
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static int radeon_atpx_switch_mux(acpi_handle handle, int mux_id)
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{
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return radeon_atpx_execute(handle, ATPX_MUX_SELECT, mux_id);
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}
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2011-05-06 12:42:49 +07:00
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static int radeon_atpx_switch_i2c_mux(acpi_handle handle, int mux_id)
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{
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return radeon_atpx_execute(handle, ATPX_I2C_MUX_SELECT, mux_id);
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}
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static int radeon_atpx_switch_start(acpi_handle handle, int gpu_id)
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{
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return radeon_atpx_execute(handle, ATPX_SWITCH_START, gpu_id);
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}
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static int radeon_atpx_switch_end(acpi_handle handle, int gpu_id)
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{
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return radeon_atpx_execute(handle, ATPX_SWITCH_END, gpu_id);
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}
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2010-02-01 12:38:10 +07:00
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static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
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{
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2011-05-06 12:42:49 +07:00
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int gpu_id;
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2010-02-01 12:38:10 +07:00
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if (id == VGA_SWITCHEROO_IGD)
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2011-05-06 12:42:49 +07:00
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gpu_id = ATPX_INTEGRATED;
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2010-02-01 12:38:10 +07:00
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else
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2011-05-06 12:42:49 +07:00
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gpu_id = ATPX_DISCRETE;
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radeon_atpx_switch_start(radeon_atpx_priv.atpx_handle, gpu_id);
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radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, gpu_id);
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radeon_atpx_switch_i2c_mux(radeon_atpx_priv.atpx_handle, gpu_id);
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radeon_atpx_switch_end(radeon_atpx_priv.atpx_handle, gpu_id);
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2010-02-01 12:38:10 +07:00
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return 0;
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}
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static int radeon_atpx_power_state(enum vga_switcheroo_client_id id,
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enum vga_switcheroo_state state)
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{
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/* on w500 ACPI can't change intel gpu state */
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if (id == VGA_SWITCHEROO_IGD)
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return 0;
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radeon_atpx_set_discrete_state(radeon_atpx_priv.atpx_handle, state);
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return 0;
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}
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static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
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{
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2012-08-17 02:39:09 +07:00
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acpi_handle dhandle, atpx_handle;
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2010-02-01 12:38:10 +07:00
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acpi_status status;
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dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
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if (!dhandle)
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return false;
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status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
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if (ACPI_FAILURE(status))
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return false;
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radeon_atpx_priv.dhandle = dhandle;
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radeon_atpx_priv.atpx_handle = atpx_handle;
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return true;
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}
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static int radeon_atpx_init(void)
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{
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/* set up the ATPX handle */
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radeon_atpx_get_version(radeon_atpx_priv.atpx_handle);
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return 0;
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}
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static int radeon_atpx_get_client_id(struct pci_dev *pdev)
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{
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if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
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return VGA_SWITCHEROO_IGD;
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else
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return VGA_SWITCHEROO_DIS;
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}
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static struct vga_switcheroo_handler radeon_atpx_handler = {
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.switchto = radeon_atpx_switchto,
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.power_state = radeon_atpx_power_state,
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.init = radeon_atpx_init,
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.get_client_id = radeon_atpx_get_client_id,
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};
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static bool radeon_atpx_detect(void)
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{
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char acpi_method_name[255] = { 0 };
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struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
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struct pci_dev *pdev = NULL;
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bool has_atpx = false;
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int vga_count = 0;
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while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
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vga_count++;
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has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
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}
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if (has_atpx && vga_count == 2) {
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acpi_get_name(radeon_atpx_priv.atpx_handle, ACPI_FULL_PATHNAME, &buffer);
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printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",
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acpi_method_name);
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radeon_atpx_priv.atpx_detected = true;
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return true;
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}
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return false;
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}
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void radeon_register_atpx_handler(void)
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{
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bool r;
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/* detect if we have any ATPX + 2 VGA in the system */
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r = radeon_atpx_detect();
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if (!r)
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return;
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vga_switcheroo_register_handler(&radeon_atpx_handler);
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}
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void radeon_unregister_atpx_handler(void)
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{
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vga_switcheroo_unregister_handler();
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}
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