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afe75951 AL |
1 | #include <linux/libata.h> |
2 | #include <linux/cdrom.h> | |
3 | ||
4 | #include "libata.h" | |
5 | ||
6 | enum odd_mech_type { | |
7 | ODD_MECH_TYPE_SLOT, | |
8 | ODD_MECH_TYPE_DRAWER, | |
9 | ODD_MECH_TYPE_UNSUPPORTED, | |
10 | }; | |
11 | ||
12 | struct zpodd { | |
13 | enum odd_mech_type mech_type; /* init during probe, RO afterwards */ | |
14 | struct ata_device *dev; | |
15 | }; | |
16 | ||
17 | /* Per the spec, only slot type and drawer type ODD can be supported */ | |
18 | static enum odd_mech_type zpodd_get_mech_type(struct ata_device *dev) | |
19 | { | |
20 | char buf[16]; | |
21 | unsigned int ret; | |
22 | struct rm_feature_desc *desc = (void *)(buf + 8); | |
23 | struct ata_taskfile tf = {}; | |
24 | ||
25 | char cdb[] = { GPCMD_GET_CONFIGURATION, | |
26 | 2, /* only 1 feature descriptor requested */ | |
27 | 0, 3, /* 3, removable medium feature */ | |
28 | 0, 0, 0,/* reserved */ | |
29 | 0, sizeof(buf), | |
30 | 0, 0, 0, | |
31 | }; | |
32 | ||
33 | tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
34 | tf.command = ATA_CMD_PACKET; | |
35 | tf.protocol = ATAPI_PROT_PIO; | |
36 | tf.lbam = sizeof(buf); | |
37 | ||
38 | ret = ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE, | |
39 | buf, sizeof(buf), 0); | |
40 | if (ret) | |
41 | return ODD_MECH_TYPE_UNSUPPORTED; | |
42 | ||
43 | if (be16_to_cpu(desc->feature_code) != 3) | |
44 | return ODD_MECH_TYPE_UNSUPPORTED; | |
45 | ||
46 | if (desc->mech_type == 0 && desc->load == 0 && desc->eject == 1) | |
47 | return ODD_MECH_TYPE_SLOT; | |
48 | else if (desc->mech_type == 1 && desc->load == 0 && desc->eject == 1) | |
49 | return ODD_MECH_TYPE_DRAWER; | |
50 | else | |
51 | return ODD_MECH_TYPE_UNSUPPORTED; | |
52 | } | |
53 | ||
54 | static bool odd_can_poweroff(struct ata_device *ata_dev) | |
55 | { | |
56 | acpi_handle handle; | |
57 | acpi_status status; | |
58 | struct acpi_device *acpi_dev; | |
59 | ||
60 | handle = ata_dev_acpi_handle(ata_dev); | |
61 | if (!handle) | |
62 | return false; | |
63 | ||
64 | status = acpi_bus_get_device(handle, &acpi_dev); | |
65 | if (ACPI_FAILURE(status)) | |
66 | return false; | |
67 | ||
68 | return acpi_device_can_poweroff(acpi_dev); | |
69 | } | |
70 | ||
71 | void zpodd_init(struct ata_device *dev) | |
72 | { | |
73 | enum odd_mech_type mech_type; | |
74 | struct zpodd *zpodd; | |
75 | ||
76 | if (dev->zpodd) | |
77 | return; | |
78 | ||
79 | if (!odd_can_poweroff(dev)) | |
80 | return; | |
81 | ||
82 | mech_type = zpodd_get_mech_type(dev); | |
83 | if (mech_type == ODD_MECH_TYPE_UNSUPPORTED) | |
84 | return; | |
85 | ||
86 | zpodd = kzalloc(sizeof(struct zpodd), GFP_KERNEL); | |
87 | if (!zpodd) | |
88 | return; | |
89 | ||
90 | zpodd->mech_type = mech_type; | |
91 | ||
92 | zpodd->dev = dev; | |
93 | dev->zpodd = zpodd; | |
94 | } | |
95 | ||
96 | void zpodd_exit(struct ata_device *dev) | |
97 | { | |
98 | kfree(dev->zpodd); | |
99 | dev->zpodd = NULL; | |
100 | } |