1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
#include <linux/libata.h>
#include <linux/cdrom.h>
#include <linux/pm_runtime.h>
#include <linux/module.h>
#include <scsi/scsi_device.h>
#include "libata.h"
static int zpodd_poweroff_delay = 30; /* 30 seconds for power off delay */
module_param(zpodd_poweroff_delay, int, 0644);
MODULE_PARM_DESC(zpodd_poweroff_delay, "Poweroff delay for ZPODD in seconds");
enum odd_mech_type {
ODD_MECH_TYPE_SLOT,
ODD_MECH_TYPE_DRAWER,
ODD_MECH_TYPE_UNSUPPORTED,
};
struct zpodd {
enum odd_mech_type mech_type; /* init during probe, RO afterwards */
struct ata_device *dev;
/* The following fields are synchronized by PM core. */
bool from_notify; /* resumed as a result of
* acpi wake notification */
bool zp_ready; /* ZP ready state */
unsigned long last_ready; /* last ZP ready timestamp */
bool zp_sampled; /* ZP ready state sampled */
};
/* Per the spec, only slot type and drawer type ODD can be supported */
static enum odd_mech_type zpodd_get_mech_type(struct ata_device *dev)
{
char buf[16];
unsigned int ret;
struct rm_feature_desc *desc = (void *)(buf + 8);
struct ata_taskfile tf = {};
char cdb[] = { GPCMD_GET_CONFIGURATION,
2, /* only 1 feature descriptor requested */
0, 3, /* 3, removable medium feature */
0, 0, 0,/* reserved */
0, sizeof(buf),
0, 0, 0,
};
tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
tf.command = ATA_CMD_PACKET;
tf.protocol = ATAPI_PROT_PIO;
tf.lbam = sizeof(buf);
ret = ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE,
buf, sizeof(buf), 0);
if (ret)
return ODD_MECH_TYPE_UNSUPPORTED;
if (be16_to_cpu(desc->feature_code) != 3)
return ODD_MECH_TYPE_UNSUPPORTED;
if (desc->mech_type == 0 && desc->load == 0 && desc->eject == 1)
return ODD_MECH_TYPE_SLOT;
else if (desc->mech_type == 1 && desc->load == 0 && desc->eject == 1)
return ODD_MECH_TYPE_DRAWER;
else
return ODD_MECH_TYPE_UNSUPPORTED;
}
static bool odd_can_poweroff(struct ata_device *ata_dev)
{
acpi_handle handle;
acpi_status status;
struct acpi_device *acpi_dev;
handle = ata_dev_acpi_handle(ata_dev);
if (!handle)
return false;
status = acpi_bus_get_device(handle, &acpi_dev);
if (ACPI_FAILURE(status))
return false;
return acpi_device_can_poweroff(acpi_dev);
}
/* Test if ODD is zero power ready by sense code */
static bool zpready(struct ata_device *dev)
{
u8 sense_key, *sense_buf;
unsigned int ret, asc, ascq, add_len;
struct zpodd *zpodd = dev->zpodd;
ret = atapi_eh_tur(dev, &sense_key);
if (!ret || sense_key != NOT_READY)
return false;
sense_buf = dev->link->ap->sector_buf;
ret = atapi_eh_request_sense(dev, sense_buf, sense_key);
if (ret)
return false;
/* sense valid */
if ((sense_buf[0] & 0x7f) != 0x70)
return false;
add_len = sense_buf[7];
/* has asc and ascq */
if (add_len < 6)
return false;
asc = sense_buf[12];
ascq = sense_buf[13];
if (zpodd->mech_type == ODD_MECH_TYPE_SLOT)
/* no media inside */
return asc == 0x3a;
else
/* no media inside and door closed */
return asc == 0x3a && ascq == 0x01;
}
/*
* Update the zpodd->zp_ready field. This field will only be set
* if the ODD has stayed in ZP ready state for zpodd_poweroff_delay
* time, and will be used to decide if power off is allowed. If it
* is set, it will be cleared during resume from powered off state.
*/
void zpodd_on_suspend(struct ata_device *dev)
{
struct zpodd *zpodd = dev->zpodd;
unsigned long expires;
if (!zpready(dev)) {
zpodd->zp_sampled = false;
return;
}
if (!zpodd->zp_sampled) {
zpodd->zp_sampled = true;
zpodd->last_ready = jiffies;
return;
}
expires = zpodd->last_ready +
msecs_to_jiffies(zpodd_poweroff_delay * 1000);
if (time_before(jiffies, expires))
return;
zpodd->zp_ready = true;
}
static void zpodd_wake_dev(acpi_handle handle, u32 event, void *context)
{
struct ata_device *ata_dev = context;
struct zpodd *zpodd = ata_dev->zpodd;
struct device *dev = &ata_dev->sdev->sdev_gendev;
if (event == ACPI_NOTIFY_DEVICE_WAKE && ata_dev &&
pm_runtime_suspended(dev)) {
zpodd->from_notify = true;
pm_runtime_resume(dev);
}
}
static void ata_acpi_add_pm_notifier(struct ata_device *dev)
{
acpi_handle handle = ata_dev_acpi_handle(dev);
acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
zpodd_wake_dev, dev);
}
static void ata_acpi_remove_pm_notifier(struct ata_device *dev)
{
acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->sdev->sdev_gendev);
acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, zpodd_wake_dev);
}
void zpodd_init(struct ata_device *dev)
{
enum odd_mech_type mech_type;
struct zpodd *zpodd;
if (dev->zpodd)
return;
if (!odd_can_poweroff(dev))
return;
mech_type = zpodd_get_mech_type(dev);
if (mech_type == ODD_MECH_TYPE_UNSUPPORTED)
return;
zpodd = kzalloc(sizeof(struct zpodd), GFP_KERNEL);
if (!zpodd)
return;
zpodd->mech_type = mech_type;
ata_acpi_add_pm_notifier(dev);
zpodd->dev = dev;
dev->zpodd = zpodd;
}
void zpodd_exit(struct ata_device *dev)
{
ata_acpi_remove_pm_notifier(dev);
kfree(dev->zpodd);
dev->zpodd = NULL;
}
|
