aboutsummaryrefslogtreecommitdiff
path: root/drivers/ata/libata-zpodd.c
blob: cd8daf47188b0a635cd697a5ed406c0c92e02ab6 (plain)
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
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
#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 */
	bool			powered_off; /* ODD is powered off
					      *	during suspend */
};

static int eject_tray(struct ata_device *dev)
{
	struct ata_taskfile tf;
	const char cdb[] = {  GPCMD_START_STOP_UNIT,
		0, 0, 0,
		0x02,     /* LoEj */
		0, 0, 0, 0, 0, 0, 0,
	};

	ata_tf_init(dev, &tf);
	tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf.command = ATA_CMD_PACKET;
	tf.protocol = ATAPI_PROT_NODATA;

	return ata_exec_internal(dev, &tf, cdb, DMA_NONE, NULL, 0, 0);
}

/* 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,
	};

	ata_tf_init(dev, &tf);
	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;
		zpodd->zp_ready = 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;
}

bool zpodd_zpready(struct ata_device *dev)
{
	struct zpodd *zpodd = dev->zpodd;
	return zpodd->zp_ready;
}

/*
 * Enable runtime wake capability through ACPI and set the powered_off flag,
 * this flag will be used during resume to decide what operations are needed
 * to take.
 *
 * Also, media poll needs to be silenced, so that it doesn't bring the ODD
 * back to full power state every few seconds.
 */
void zpodd_enable_run_wake(struct ata_device *dev)
{
	struct zpodd *zpodd = dev->zpodd;

	sdev_disable_disk_events(dev->sdev);

	zpodd->powered_off = true;
	device_set_run_wake(&dev->sdev->sdev_gendev, true);
	acpi_pm_device_run_wake(&dev->sdev->sdev_gendev, true);
}

/* Disable runtime wake capability if it is enabled */
void zpodd_disable_run_wake(struct ata_device *dev)
{
	struct zpodd *zpodd = dev->zpodd;

	if (zpodd->powered_off) {
		acpi_pm_device_run_wake(&dev->sdev->sdev_gendev, false);
		device_set_run_wake(&dev->sdev->sdev_gendev, false);
	}
}

/*
 * Post power on processing after the ODD has been recovered. If the
 * ODD wasn't powered off during suspend, it doesn't do anything.
 *
 * For drawer type ODD, if it is powered on due to user pressed the
 * eject button, the tray needs to be ejected. This can only be done
 * after the ODD has been recovered, i.e. link is initialized and
 * device is able to process NON_DATA PIO command, as eject needs to
 * send command for the ODD to process.
 *
 * The from_notify flag set in wake notification handler function
 * zpodd_wake_dev represents if power on is due to user's action.
 *
 * For both types of ODD, several fields need to be reset.
 */
void zpodd_post_poweron(struct ata_device *dev)
{
	struct zpodd *zpodd = dev->zpodd;

	if (!zpodd->powered_off)
		return;

	zpodd->powered_off = false;

	if (zpodd->from_notify) {
		zpodd->from_notify = false;
		if (zpodd->mech_type == ODD_MECH_TYPE_DRAWER)
			eject_tray(dev);
	}

	zpodd->zp_sampled = false;
	zpodd->zp_ready = false;

	sdev_enable_disk_events(dev->sdev);
}

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 && 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;
}