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afe75951 AL |
1 | #include <linux/libata.h> |
2 | #include <linux/cdrom.h> | |
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3 | #include <linux/pm_runtime.h> |
4 | #include <scsi/scsi_device.h> | |
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5 | |
6 | #include "libata.h" | |
7 | ||
8 | enum odd_mech_type { | |
9 | ODD_MECH_TYPE_SLOT, | |
10 | ODD_MECH_TYPE_DRAWER, | |
11 | ODD_MECH_TYPE_UNSUPPORTED, | |
12 | }; | |
13 | ||
14 | struct zpodd { | |
15 | enum odd_mech_type mech_type; /* init during probe, RO afterwards */ | |
16 | struct ata_device *dev; | |
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17 | |
18 | /* The following fields are synchronized by PM core. */ | |
19 | bool from_notify; /* resumed as a result of | |
20 | * acpi wake notification */ | |
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21 | }; |
22 | ||
23 | /* Per the spec, only slot type and drawer type ODD can be supported */ | |
24 | static enum odd_mech_type zpodd_get_mech_type(struct ata_device *dev) | |
25 | { | |
26 | char buf[16]; | |
27 | unsigned int ret; | |
28 | struct rm_feature_desc *desc = (void *)(buf + 8); | |
29 | struct ata_taskfile tf = {}; | |
30 | ||
31 | char cdb[] = { GPCMD_GET_CONFIGURATION, | |
32 | 2, /* only 1 feature descriptor requested */ | |
33 | 0, 3, /* 3, removable medium feature */ | |
34 | 0, 0, 0,/* reserved */ | |
35 | 0, sizeof(buf), | |
36 | 0, 0, 0, | |
37 | }; | |
38 | ||
39 | tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
40 | tf.command = ATA_CMD_PACKET; | |
41 | tf.protocol = ATAPI_PROT_PIO; | |
42 | tf.lbam = sizeof(buf); | |
43 | ||
44 | ret = ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE, | |
45 | buf, sizeof(buf), 0); | |
46 | if (ret) | |
47 | return ODD_MECH_TYPE_UNSUPPORTED; | |
48 | ||
49 | if (be16_to_cpu(desc->feature_code) != 3) | |
50 | return ODD_MECH_TYPE_UNSUPPORTED; | |
51 | ||
52 | if (desc->mech_type == 0 && desc->load == 0 && desc->eject == 1) | |
53 | return ODD_MECH_TYPE_SLOT; | |
54 | else if (desc->mech_type == 1 && desc->load == 0 && desc->eject == 1) | |
55 | return ODD_MECH_TYPE_DRAWER; | |
56 | else | |
57 | return ODD_MECH_TYPE_UNSUPPORTED; | |
58 | } | |
59 | ||
60 | static bool odd_can_poweroff(struct ata_device *ata_dev) | |
61 | { | |
62 | acpi_handle handle; | |
63 | acpi_status status; | |
64 | struct acpi_device *acpi_dev; | |
65 | ||
66 | handle = ata_dev_acpi_handle(ata_dev); | |
67 | if (!handle) | |
68 | return false; | |
69 | ||
70 | status = acpi_bus_get_device(handle, &acpi_dev); | |
71 | if (ACPI_FAILURE(status)) | |
72 | return false; | |
73 | ||
74 | return acpi_device_can_poweroff(acpi_dev); | |
75 | } | |
76 | ||
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77 | static void zpodd_wake_dev(acpi_handle handle, u32 event, void *context) |
78 | { | |
79 | struct ata_device *ata_dev = context; | |
80 | struct zpodd *zpodd = ata_dev->zpodd; | |
81 | struct device *dev = &ata_dev->sdev->sdev_gendev; | |
82 | ||
83 | if (event == ACPI_NOTIFY_DEVICE_WAKE && ata_dev && | |
84 | pm_runtime_suspended(dev)) { | |
85 | zpodd->from_notify = true; | |
86 | pm_runtime_resume(dev); | |
87 | } | |
88 | } | |
89 | ||
90 | static void ata_acpi_add_pm_notifier(struct ata_device *dev) | |
91 | { | |
92 | acpi_handle handle = ata_dev_acpi_handle(dev); | |
93 | acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, | |
94 | zpodd_wake_dev, dev); | |
95 | } | |
96 | ||
97 | static void ata_acpi_remove_pm_notifier(struct ata_device *dev) | |
98 | { | |
99 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->sdev->sdev_gendev); | |
100 | acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, zpodd_wake_dev); | |
101 | } | |
102 | ||
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103 | void zpodd_init(struct ata_device *dev) |
104 | { | |
105 | enum odd_mech_type mech_type; | |
106 | struct zpodd *zpodd; | |
107 | ||
108 | if (dev->zpodd) | |
109 | return; | |
110 | ||
111 | if (!odd_can_poweroff(dev)) | |
112 | return; | |
113 | ||
114 | mech_type = zpodd_get_mech_type(dev); | |
115 | if (mech_type == ODD_MECH_TYPE_UNSUPPORTED) | |
116 | return; | |
117 | ||
118 | zpodd = kzalloc(sizeof(struct zpodd), GFP_KERNEL); | |
119 | if (!zpodd) | |
120 | return; | |
121 | ||
122 | zpodd->mech_type = mech_type; | |
123 | ||
f064a20d | 124 | ata_acpi_add_pm_notifier(dev); |
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125 | zpodd->dev = dev; |
126 | dev->zpodd = zpodd; | |
127 | } | |
128 | ||
129 | void zpodd_exit(struct ata_device *dev) | |
130 | { | |
f064a20d | 131 | ata_acpi_remove_pm_notifier(dev); |
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132 | kfree(dev->zpodd); |
133 | dev->zpodd = NULL; | |
134 | } |