Commit | Line | Data |
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6a9ee8af DA |
1 | /* |
2 | * Copyright (c) 2010 Red Hat Inc. | |
3 | * Author : Dave Airlie <airlied@redhat.com> | |
4 | * | |
5 | * Licensed under GPLv2 | |
6 | * | |
7 | * ATPX support for both Intel/ATI | |
8 | */ | |
6a9ee8af | 9 | #include <linux/vga_switcheroo.h> |
5a0e3ad6 | 10 | #include <linux/slab.h> |
6a9ee8af DA |
11 | #include <acpi/acpi.h> |
12 | #include <acpi/acpi_bus.h> | |
13 | #include <linux/pci.h> | |
14 | ||
15 | #define ATPX_VERSION 0 | |
16 | #define ATPX_GPU_PWR 2 | |
17 | #define ATPX_MUX_SELECT 3 | |
58e73811 AD |
18 | #define ATPX_I2C_MUX_SELECT 4 |
19 | #define ATPX_SWITCH_START 5 | |
20 | #define ATPX_SWITCH_END 6 | |
6a9ee8af DA |
21 | |
22 | #define ATPX_INTEGRATED 0 | |
23 | #define ATPX_DISCRETE 1 | |
24 | ||
25 | #define ATPX_MUX_IGD 0 | |
26 | #define ATPX_MUX_DISCRETE 1 | |
27 | ||
28 | static struct radeon_atpx_priv { | |
29 | bool atpx_detected; | |
30 | /* handle for device - and atpx */ | |
31 | acpi_handle dhandle; | |
32 | acpi_handle atpx_handle; | |
6a9ee8af DA |
33 | } radeon_atpx_priv; |
34 | ||
6a9ee8af DA |
35 | static int radeon_atpx_get_version(acpi_handle handle) |
36 | { | |
37 | acpi_status status; | |
38 | union acpi_object atpx_arg_elements[2], *obj; | |
39 | struct acpi_object_list atpx_arg; | |
40 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
41 | ||
42 | atpx_arg.count = 2; | |
43 | atpx_arg.pointer = &atpx_arg_elements[0]; | |
44 | ||
45 | atpx_arg_elements[0].type = ACPI_TYPE_INTEGER; | |
46 | atpx_arg_elements[0].integer.value = ATPX_VERSION; | |
47 | ||
48 | atpx_arg_elements[1].type = ACPI_TYPE_INTEGER; | |
49 | atpx_arg_elements[1].integer.value = ATPX_VERSION; | |
50 | ||
51 | status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer); | |
52 | if (ACPI_FAILURE(status)) { | |
53 | printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status)); | |
54 | return -ENOSYS; | |
55 | } | |
56 | obj = (union acpi_object *)buffer.pointer; | |
57 | if (obj && (obj->type == ACPI_TYPE_BUFFER)) | |
58 | printk(KERN_INFO "radeon atpx: version is %d\n", *((u8 *)(obj->buffer.pointer) + 2)); | |
59 | kfree(buffer.pointer); | |
60 | return 0; | |
61 | } | |
62 | ||
63 | static int radeon_atpx_execute(acpi_handle handle, int cmd_id, u16 value) | |
64 | { | |
65 | acpi_status status; | |
66 | union acpi_object atpx_arg_elements[2]; | |
67 | struct acpi_object_list atpx_arg; | |
68 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
69 | uint8_t buf[4] = {0}; | |
70 | ||
71 | if (!handle) | |
72 | return -EINVAL; | |
73 | ||
74 | atpx_arg.count = 2; | |
75 | atpx_arg.pointer = &atpx_arg_elements[0]; | |
76 | ||
77 | atpx_arg_elements[0].type = ACPI_TYPE_INTEGER; | |
78 | atpx_arg_elements[0].integer.value = cmd_id; | |
79 | ||
80 | buf[2] = value & 0xff; | |
81 | buf[3] = (value >> 8) & 0xff; | |
82 | ||
83 | atpx_arg_elements[1].type = ACPI_TYPE_BUFFER; | |
84 | atpx_arg_elements[1].buffer.length = 4; | |
85 | atpx_arg_elements[1].buffer.pointer = buf; | |
86 | ||
87 | status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer); | |
88 | if (ACPI_FAILURE(status)) { | |
89 | printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status)); | |
90 | return -ENOSYS; | |
91 | } | |
92 | kfree(buffer.pointer); | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | static int radeon_atpx_set_discrete_state(acpi_handle handle, int state) | |
98 | { | |
99 | return radeon_atpx_execute(handle, ATPX_GPU_PWR, state); | |
100 | } | |
101 | ||
102 | static int radeon_atpx_switch_mux(acpi_handle handle, int mux_id) | |
103 | { | |
104 | return radeon_atpx_execute(handle, ATPX_MUX_SELECT, mux_id); | |
105 | } | |
106 | ||
58e73811 AD |
107 | static int radeon_atpx_switch_i2c_mux(acpi_handle handle, int mux_id) |
108 | { | |
109 | return radeon_atpx_execute(handle, ATPX_I2C_MUX_SELECT, mux_id); | |
110 | } | |
111 | ||
112 | static int radeon_atpx_switch_start(acpi_handle handle, int gpu_id) | |
113 | { | |
114 | return radeon_atpx_execute(handle, ATPX_SWITCH_START, gpu_id); | |
115 | } | |
116 | ||
117 | static int radeon_atpx_switch_end(acpi_handle handle, int gpu_id) | |
118 | { | |
119 | return radeon_atpx_execute(handle, ATPX_SWITCH_END, gpu_id); | |
120 | } | |
6a9ee8af DA |
121 | |
122 | static int radeon_atpx_switchto(enum vga_switcheroo_client_id id) | |
123 | { | |
58e73811 AD |
124 | int gpu_id; |
125 | ||
6a9ee8af | 126 | if (id == VGA_SWITCHEROO_IGD) |
58e73811 | 127 | gpu_id = ATPX_INTEGRATED; |
6a9ee8af | 128 | else |
58e73811 AD |
129 | gpu_id = ATPX_DISCRETE; |
130 | ||
131 | radeon_atpx_switch_start(radeon_atpx_priv.atpx_handle, gpu_id); | |
132 | radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, gpu_id); | |
133 | radeon_atpx_switch_i2c_mux(radeon_atpx_priv.atpx_handle, gpu_id); | |
134 | radeon_atpx_switch_end(radeon_atpx_priv.atpx_handle, gpu_id); | |
135 | ||
6a9ee8af DA |
136 | return 0; |
137 | } | |
138 | ||
139 | static int radeon_atpx_power_state(enum vga_switcheroo_client_id id, | |
140 | enum vga_switcheroo_state state) | |
141 | { | |
142 | /* on w500 ACPI can't change intel gpu state */ | |
143 | if (id == VGA_SWITCHEROO_IGD) | |
144 | return 0; | |
145 | ||
146 | radeon_atpx_set_discrete_state(radeon_atpx_priv.atpx_handle, state); | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev) | |
151 | { | |
c61e2775 | 152 | acpi_handle dhandle, atpx_handle; |
6a9ee8af DA |
153 | acpi_status status; |
154 | ||
155 | dhandle = DEVICE_ACPI_HANDLE(&pdev->dev); | |
156 | if (!dhandle) | |
157 | return false; | |
158 | ||
159 | status = acpi_get_handle(dhandle, "ATPX", &atpx_handle); | |
160 | if (ACPI_FAILURE(status)) | |
161 | return false; | |
162 | ||
6a9ee8af DA |
163 | radeon_atpx_priv.dhandle = dhandle; |
164 | radeon_atpx_priv.atpx_handle = atpx_handle; | |
6a9ee8af DA |
165 | return true; |
166 | } | |
167 | ||
168 | static int radeon_atpx_init(void) | |
169 | { | |
170 | /* set up the ATPX handle */ | |
171 | ||
172 | radeon_atpx_get_version(radeon_atpx_priv.atpx_handle); | |
173 | return 0; | |
174 | } | |
175 | ||
176 | static int radeon_atpx_get_client_id(struct pci_dev *pdev) | |
177 | { | |
178 | if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev)) | |
179 | return VGA_SWITCHEROO_IGD; | |
180 | else | |
181 | return VGA_SWITCHEROO_DIS; | |
182 | } | |
183 | ||
184 | static struct vga_switcheroo_handler radeon_atpx_handler = { | |
185 | .switchto = radeon_atpx_switchto, | |
186 | .power_state = radeon_atpx_power_state, | |
187 | .init = radeon_atpx_init, | |
188 | .get_client_id = radeon_atpx_get_client_id, | |
189 | }; | |
190 | ||
191 | static bool radeon_atpx_detect(void) | |
192 | { | |
193 | char acpi_method_name[255] = { 0 }; | |
194 | struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; | |
195 | struct pci_dev *pdev = NULL; | |
196 | bool has_atpx = false; | |
197 | int vga_count = 0; | |
198 | ||
199 | while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { | |
200 | vga_count++; | |
201 | ||
202 | has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true); | |
203 | } | |
204 | ||
205 | if (has_atpx && vga_count == 2) { | |
206 | acpi_get_name(radeon_atpx_priv.atpx_handle, ACPI_FULL_PATHNAME, &buffer); | |
207 | printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n", | |
208 | acpi_method_name); | |
209 | radeon_atpx_priv.atpx_detected = true; | |
210 | return true; | |
211 | } | |
212 | return false; | |
213 | } | |
214 | ||
215 | void radeon_register_atpx_handler(void) | |
216 | { | |
217 | bool r; | |
218 | ||
219 | /* detect if we have any ATPX + 2 VGA in the system */ | |
220 | r = radeon_atpx_detect(); | |
221 | if (!r) | |
222 | return; | |
223 | ||
224 | vga_switcheroo_register_handler(&radeon_atpx_handler); | |
225 | } | |
226 | ||
227 | void radeon_unregister_atpx_handler(void) | |
228 | { | |
229 | vga_switcheroo_unregister_handler(); | |
230 | } |