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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
afe75951 AL |
2 | #include <linux/libata.h> |
3 | #include <linux/cdrom.h> | |
f064a20d | 4 | #include <linux/pm_runtime.h> |
3dc67440 | 5 | #include <linux/module.h> |
f1bc1e4c | 6 | #include <linux/pm_qos.h> |
f064a20d | 7 | #include <scsi/scsi_device.h> |
afe75951 AL |
8 | |
9 | #include "libata.h" | |
10 | ||
3dc67440 AL |
11 | static int zpodd_poweroff_delay = 30; /* 30 seconds for power off delay */ |
12 | module_param(zpodd_poweroff_delay, int, 0644); | |
13 | MODULE_PARM_DESC(zpodd_poweroff_delay, "Poweroff delay for ZPODD in seconds"); | |
14 | ||
afe75951 AL |
15 | enum odd_mech_type { |
16 | ODD_MECH_TYPE_SLOT, | |
17 | ODD_MECH_TYPE_DRAWER, | |
18 | ODD_MECH_TYPE_UNSUPPORTED, | |
19 | }; | |
20 | ||
21 | struct zpodd { | |
22 | enum odd_mech_type mech_type; /* init during probe, RO afterwards */ | |
23 | struct ata_device *dev; | |
f064a20d AL |
24 | |
25 | /* The following fields are synchronized by PM core. */ | |
26 | bool from_notify; /* resumed as a result of | |
27 | * acpi wake notification */ | |
3dc67440 AL |
28 | bool zp_ready; /* ZP ready state */ |
29 | unsigned long last_ready; /* last ZP ready timestamp */ | |
30 | bool zp_sampled; /* ZP ready state sampled */ | |
21334205 AL |
31 | bool powered_off; /* ODD is powered off |
32 | * during suspend */ | |
afe75951 AL |
33 | }; |
34 | ||
21334205 AL |
35 | static int eject_tray(struct ata_device *dev) |
36 | { | |
d0887c43 | 37 | struct ata_taskfile tf; |
27c0f1e5 | 38 | static const char cdb[ATAPI_CDB_LEN] = { GPCMD_START_STOP_UNIT, |
21334205 AL |
39 | 0, 0, 0, |
40 | 0x02, /* LoEj */ | |
41 | 0, 0, 0, 0, 0, 0, 0, | |
42 | }; | |
43 | ||
d0887c43 | 44 | ata_tf_init(dev, &tf); |
21334205 AL |
45 | tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; |
46 | tf.command = ATA_CMD_PACKET; | |
47 | tf.protocol = ATAPI_PROT_NODATA; | |
48 | ||
49 | return ata_exec_internal(dev, &tf, cdb, DMA_NONE, NULL, 0, 0); | |
50 | } | |
51 | ||
afe75951 AL |
52 | /* Per the spec, only slot type and drawer type ODD can be supported */ |
53 | static enum odd_mech_type zpodd_get_mech_type(struct ata_device *dev) | |
54 | { | |
55 | char buf[16]; | |
56 | unsigned int ret; | |
57 | struct rm_feature_desc *desc = (void *)(buf + 8); | |
d0887c43 | 58 | struct ata_taskfile tf; |
795ef788 | 59 | static const char cdb[] = { GPCMD_GET_CONFIGURATION, |
afe75951 AL |
60 | 2, /* only 1 feature descriptor requested */ |
61 | 0, 3, /* 3, removable medium feature */ | |
62 | 0, 0, 0,/* reserved */ | |
63 | 0, sizeof(buf), | |
64 | 0, 0, 0, | |
65 | }; | |
66 | ||
d0887c43 | 67 | ata_tf_init(dev, &tf); |
afe75951 AL |
68 | tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; |
69 | tf.command = ATA_CMD_PACKET; | |
70 | tf.protocol = ATAPI_PROT_PIO; | |
71 | tf.lbam = sizeof(buf); | |
72 | ||
73 | ret = ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE, | |
74 | buf, sizeof(buf), 0); | |
75 | if (ret) | |
76 | return ODD_MECH_TYPE_UNSUPPORTED; | |
77 | ||
78 | if (be16_to_cpu(desc->feature_code) != 3) | |
79 | return ODD_MECH_TYPE_UNSUPPORTED; | |
80 | ||
81 | if (desc->mech_type == 0 && desc->load == 0 && desc->eject == 1) | |
82 | return ODD_MECH_TYPE_SLOT; | |
83 | else if (desc->mech_type == 1 && desc->load == 0 && desc->eject == 1) | |
84 | return ODD_MECH_TYPE_DRAWER; | |
85 | else | |
86 | return ODD_MECH_TYPE_UNSUPPORTED; | |
87 | } | |
88 | ||
3dc67440 AL |
89 | /* Test if ODD is zero power ready by sense code */ |
90 | static bool zpready(struct ata_device *dev) | |
91 | { | |
92 | u8 sense_key, *sense_buf; | |
93 | unsigned int ret, asc, ascq, add_len; | |
94 | struct zpodd *zpodd = dev->zpodd; | |
95 | ||
96 | ret = atapi_eh_tur(dev, &sense_key); | |
97 | ||
98 | if (!ret || sense_key != NOT_READY) | |
99 | return false; | |
100 | ||
101 | sense_buf = dev->link->ap->sector_buf; | |
102 | ret = atapi_eh_request_sense(dev, sense_buf, sense_key); | |
103 | if (ret) | |
104 | return false; | |
105 | ||
106 | /* sense valid */ | |
107 | if ((sense_buf[0] & 0x7f) != 0x70) | |
108 | return false; | |
109 | ||
110 | add_len = sense_buf[7]; | |
111 | /* has asc and ascq */ | |
112 | if (add_len < 6) | |
113 | return false; | |
114 | ||
115 | asc = sense_buf[12]; | |
116 | ascq = sense_buf[13]; | |
117 | ||
118 | if (zpodd->mech_type == ODD_MECH_TYPE_SLOT) | |
119 | /* no media inside */ | |
120 | return asc == 0x3a; | |
121 | else | |
122 | /* no media inside and door closed */ | |
123 | return asc == 0x3a && ascq == 0x01; | |
124 | } | |
125 | ||
126 | /* | |
127 | * Update the zpodd->zp_ready field. This field will only be set | |
128 | * if the ODD has stayed in ZP ready state for zpodd_poweroff_delay | |
129 | * time, and will be used to decide if power off is allowed. If it | |
130 | * is set, it will be cleared during resume from powered off state. | |
131 | */ | |
132 | void zpodd_on_suspend(struct ata_device *dev) | |
133 | { | |
134 | struct zpodd *zpodd = dev->zpodd; | |
135 | unsigned long expires; | |
136 | ||
137 | if (!zpready(dev)) { | |
138 | zpodd->zp_sampled = false; | |
a59b9aae | 139 | zpodd->zp_ready = false; |
3dc67440 AL |
140 | return; |
141 | } | |
142 | ||
143 | if (!zpodd->zp_sampled) { | |
144 | zpodd->zp_sampled = true; | |
145 | zpodd->last_ready = jiffies; | |
146 | return; | |
147 | } | |
148 | ||
149 | expires = zpodd->last_ready + | |
150 | msecs_to_jiffies(zpodd_poweroff_delay * 1000); | |
151 | if (time_before(jiffies, expires)) | |
152 | return; | |
153 | ||
154 | zpodd->zp_ready = true; | |
155 | } | |
156 | ||
21334205 AL |
157 | bool zpodd_zpready(struct ata_device *dev) |
158 | { | |
159 | struct zpodd *zpodd = dev->zpodd; | |
160 | return zpodd->zp_ready; | |
161 | } | |
162 | ||
163 | /* | |
164 | * Enable runtime wake capability through ACPI and set the powered_off flag, | |
165 | * this flag will be used during resume to decide what operations are needed | |
166 | * to take. | |
6f4c827e AL |
167 | * |
168 | * Also, media poll needs to be silenced, so that it doesn't bring the ODD | |
169 | * back to full power state every few seconds. | |
21334205 AL |
170 | */ |
171 | void zpodd_enable_run_wake(struct ata_device *dev) | |
172 | { | |
173 | struct zpodd *zpodd = dev->zpodd; | |
174 | ||
6f4c827e AL |
175 | sdev_disable_disk_events(dev->sdev); |
176 | ||
21334205 | 177 | zpodd->powered_off = true; |
4d183d04 | 178 | acpi_pm_set_device_wakeup(&dev->tdev, true); |
21334205 AL |
179 | } |
180 | ||
181 | /* Disable runtime wake capability if it is enabled */ | |
182 | void zpodd_disable_run_wake(struct ata_device *dev) | |
183 | { | |
184 | struct zpodd *zpodd = dev->zpodd; | |
185 | ||
4d183d04 RW |
186 | if (zpodd->powered_off) |
187 | acpi_pm_set_device_wakeup(&dev->tdev, false); | |
21334205 AL |
188 | } |
189 | ||
190 | /* | |
191 | * Post power on processing after the ODD has been recovered. If the | |
192 | * ODD wasn't powered off during suspend, it doesn't do anything. | |
193 | * | |
194 | * For drawer type ODD, if it is powered on due to user pressed the | |
195 | * eject button, the tray needs to be ejected. This can only be done | |
196 | * after the ODD has been recovered, i.e. link is initialized and | |
197 | * device is able to process NON_DATA PIO command, as eject needs to | |
198 | * send command for the ODD to process. | |
199 | * | |
200 | * The from_notify flag set in wake notification handler function | |
201 | * zpodd_wake_dev represents if power on is due to user's action. | |
202 | * | |
203 | * For both types of ODD, several fields need to be reset. | |
204 | */ | |
205 | void zpodd_post_poweron(struct ata_device *dev) | |
206 | { | |
207 | struct zpodd *zpodd = dev->zpodd; | |
208 | ||
209 | if (!zpodd->powered_off) | |
210 | return; | |
211 | ||
212 | zpodd->powered_off = false; | |
213 | ||
214 | if (zpodd->from_notify) { | |
215 | zpodd->from_notify = false; | |
216 | if (zpodd->mech_type == ODD_MECH_TYPE_DRAWER) | |
217 | eject_tray(dev); | |
218 | } | |
219 | ||
220 | zpodd->zp_sampled = false; | |
221 | zpodd->zp_ready = false; | |
6f4c827e AL |
222 | |
223 | sdev_enable_disk_events(dev->sdev); | |
21334205 AL |
224 | } |
225 | ||
f064a20d AL |
226 | static void zpodd_wake_dev(acpi_handle handle, u32 event, void *context) |
227 | { | |
228 | struct ata_device *ata_dev = context; | |
229 | struct zpodd *zpodd = ata_dev->zpodd; | |
230 | struct device *dev = &ata_dev->sdev->sdev_gendev; | |
231 | ||
53637e07 | 232 | if (event == ACPI_NOTIFY_DEVICE_WAKE && pm_runtime_suspended(dev)) { |
f064a20d AL |
233 | zpodd->from_notify = true; |
234 | pm_runtime_resume(dev); | |
235 | } | |
236 | } | |
237 | ||
238 | static void ata_acpi_add_pm_notifier(struct ata_device *dev) | |
239 | { | |
240 | acpi_handle handle = ata_dev_acpi_handle(dev); | |
241 | acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, | |
242 | zpodd_wake_dev, dev); | |
243 | } | |
244 | ||
245 | static void ata_acpi_remove_pm_notifier(struct ata_device *dev) | |
246 | { | |
f1bc1e4c | 247 | acpi_handle handle = ata_dev_acpi_handle(dev); |
f064a20d AL |
248 | acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, zpodd_wake_dev); |
249 | } | |
250 | ||
afe75951 AL |
251 | void zpodd_init(struct ata_device *dev) |
252 | { | |
d9202036 | 253 | struct acpi_device *adev = ACPI_COMPANION(&dev->tdev); |
afe75951 AL |
254 | enum odd_mech_type mech_type; |
255 | struct zpodd *zpodd; | |
256 | ||
d9202036 | 257 | if (dev->zpodd || !adev || !acpi_device_can_poweroff(adev)) |
afe75951 AL |
258 | return; |
259 | ||
260 | mech_type = zpodd_get_mech_type(dev); | |
261 | if (mech_type == ODD_MECH_TYPE_UNSUPPORTED) | |
262 | return; | |
263 | ||
264 | zpodd = kzalloc(sizeof(struct zpodd), GFP_KERNEL); | |
265 | if (!zpodd) | |
266 | return; | |
267 | ||
268 | zpodd->mech_type = mech_type; | |
269 | ||
f064a20d | 270 | ata_acpi_add_pm_notifier(dev); |
afe75951 AL |
271 | zpodd->dev = dev; |
272 | dev->zpodd = zpodd; | |
f1bc1e4c | 273 | dev_pm_qos_expose_flags(&dev->tdev, 0); |
afe75951 AL |
274 | } |
275 | ||
276 | void zpodd_exit(struct ata_device *dev) | |
277 | { | |
f064a20d | 278 | ata_acpi_remove_pm_notifier(dev); |
afe75951 AL |
279 | kfree(dev->zpodd); |
280 | dev->zpodd = NULL; | |
281 | } |