[linux-2.6-block.git] / sound / usb / power.c

// SPDX-License-Identifier: GPL-2.0
/*
 *   UAC3 Power Domain state management functions
 */

#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>
#include <linux/usb/audio-v3.h>

#include "usbaudio.h"
#include "helper.h"
#include "power.h"

struct snd_usb_power_domain *
snd_usb_find_power_domain(struct usb_host_interface *ctrl_iface,
			  unsigned char id)
{
	struct snd_usb_power_domain *pd;
	void *p;

	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
	if (!pd)
		return NULL;

	p = NULL;
	while ((p = snd_usb_find_csint_desc(ctrl_iface->extra,
					    ctrl_iface->extralen,
					    p, UAC3_POWER_DOMAIN)) != NULL) {
		struct uac3_power_domain_descriptor *pd_desc = p;
		int i;

		for (i = 0; i < pd_desc->bNrEntities; i++) {
			if (pd_desc->baEntityID[i] == id) {
				pd->pd_id = pd_desc->bPowerDomainID;
				pd->pd_d1d0_rec =
					le16_to_cpu(pd_desc->waRecoveryTime1);
				pd->pd_d2d0_rec =
					le16_to_cpu(pd_desc->waRecoveryTime2);
				return pd;
			}
		}
	}

	kfree(pd);
	return NULL;
}

int snd_usb_power_domain_set(struct snd_usb_audio *chip,
			     struct snd_usb_power_domain *pd,
			     unsigned char state)
{
	struct usb_device *dev = chip->dev;
	unsigned char current_state;
	int err, idx;

	idx = snd_usb_ctrl_intf(chip) | (pd->pd_id << 8);

	err = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0),
			      UAC2_CS_CUR,
			      USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
			      UAC3_AC_POWER_DOMAIN_CONTROL << 8, idx,
			      &current_state, sizeof(current_state));
	if (err < 0) {
		dev_err(&dev->dev, "Can't get UAC3 power state for id %d\n",
			pd->pd_id);
		return err;
	}

	if (current_state == state) {
		dev_dbg(&dev->dev, "UAC3 power domain id %d already in state %d\n",
			pd->pd_id, state);
		return 0;
	}

	err = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), UAC2_CS_CUR,
			      USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
			      UAC3_AC_POWER_DOMAIN_CONTROL << 8, idx,
			      &state, sizeof(state));
	if (err < 0) {
		dev_err(&dev->dev, "Can't set UAC3 power state to %d for id %d\n",
			state, pd->pd_id);
		return err;
	}

	if (state == UAC3_PD_STATE_D0) {
		switch (current_state) {
		case UAC3_PD_STATE_D2:
			udelay(pd->pd_d2d0_rec * 50);
			break;
		case UAC3_PD_STATE_D1:
			udelay(pd->pd_d1d0_rec * 50);
			break;
		default:
			return -EINVAL;
		}
	}

	dev_dbg(&dev->dev, "UAC3 power domain id %d change to state %d\n",
		pd->pd_id, state);

	return 0;
}
Commit	Line	Data
11785ef5 JS	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* UAC3 Power Domain state management functions
	4	*/
	5
	6	#include <linux/slab.h>
	7	#include <linux/usb.h>
	8	#include <linux/usb/audio.h>
	9	#include <linux/usb/audio-v2.h>
	10	#include <linux/usb/audio-v3.h>
	11
	12	#include "usbaudio.h"
	13	#include "helper.h"
	14	#include "power.h"
	15
	16	struct snd_usb_power_domain *
	17	snd_usb_find_power_domain(struct usb_host_interface *ctrl_iface,
	18	unsigned char id)
	19	{
	20	struct snd_usb_power_domain *pd;
	21	void *p;
	22
	23	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
	24	if (!pd)
	25	return NULL;
	26
	27	p = NULL;
	28	while ((p = snd_usb_find_csint_desc(ctrl_iface->extra,
	29	ctrl_iface->extralen,
	30	p, UAC3_POWER_DOMAIN)) != NULL) {
	31	struct uac3_power_domain_descriptor *pd_desc = p;
	32	int i;
	33
	34	for (i = 0; i < pd_desc->bNrEntities; i++) {
	35	if (pd_desc->baEntityID[i] == id) {
	36	pd->pd_id = pd_desc->bPowerDomainID;
	37	pd->pd_d1d0_rec =
	38	le16_to_cpu(pd_desc->waRecoveryTime1);
	39	pd->pd_d2d0_rec =
	40	le16_to_cpu(pd_desc->waRecoveryTime2);
	41	return pd;
	42	}
	43	}
	44	}
	45
	46	kfree(pd);
	47	return NULL;
	48	}
	49
	50	int snd_usb_power_domain_set(struct snd_usb_audio *chip,
	51	struct snd_usb_power_domain *pd,
	52	unsigned char state)
	53	{
	54	struct usb_device *dev = chip->dev;
	55	unsigned char current_state;
	56	int err, idx;
	57
	58	idx = snd_usb_ctrl_intf(chip) \| (pd->pd_id << 8);
	59
	60	err = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0),
	61	UAC2_CS_CUR,
	62	USB_RECIP_INTERFACE \| USB_TYPE_CLASS \| USB_DIR_IN,
	63	UAC3_AC_POWER_DOMAIN_CONTROL << 8, idx,
	64	&current_state, sizeof(current_state));
65	if (err < 0) {
66	dev_err(&dev->dev, "Can't get UAC3 power state for id %d\n",
67	pd->pd_id);
68	return err;
69	}
70
71	if (current_state == state) {
72	dev_dbg(&dev->dev, "UAC3 power domain id %d already in state %d\n",
73	pd->pd_id, state);
74	return 0;
75	}
76
77	err = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), UAC2_CS_CUR,
78	USB_RECIP_INTERFACE \| USB_TYPE_CLASS \| USB_DIR_OUT,
79	UAC3_AC_POWER_DOMAIN_CONTROL << 8, idx,
80	&state, sizeof(state));
81	if (err < 0) {
82	dev_err(&dev->dev, "Can't set UAC3 power state to %d for id %d\n",
83	state, pd->pd_id);
84	return err;
85	}
86
87	if (state == UAC3_PD_STATE_D0) {
88	switch (current_state) {
89	case UAC3_PD_STATE_D2:
90	udelay(pd->pd_d2d0_rec * 50);
91	break;
92	case UAC3_PD_STATE_D1:
93	udelay(pd->pd_d1d0_rec * 50);
94	break;
95	default:
96	return -EINVAL;
97	}
98	}
99
100	dev_dbg(&dev->dev, "UAC3 power domain id %d change to state %d\n",
101	pd->pd_id, state);
102
103	return 0;
104	}