mirror of https://gitee.com/openkylin/linux.git
674 lines
17 KiB
C
674 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Jack abstraction layer
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*
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* Copyright 2008 Wolfson Microelectronics
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*/
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/ctype.h>
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#include <linux/mm.h>
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#include <linux/debugfs.h>
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#include <sound/jack.h>
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#include <sound/core.h>
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#include <sound/control.h>
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struct snd_jack_kctl {
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struct snd_kcontrol *kctl;
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struct list_head list; /* list of controls belong to the same jack */
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unsigned int mask_bits; /* only masked status bits are reported via kctl */
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struct snd_jack *jack; /* pointer to struct snd_jack */
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bool sw_inject_enable; /* allow to inject plug event via debugfs */
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#ifdef CONFIG_SND_JACK_INJECTION_DEBUG
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struct dentry *jack_debugfs_root; /* jack_kctl debugfs root */
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#endif
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};
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#ifdef CONFIG_SND_JACK_INPUT_DEV
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static const int jack_switch_types[SND_JACK_SWITCH_TYPES] = {
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SW_HEADPHONE_INSERT,
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SW_MICROPHONE_INSERT,
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SW_LINEOUT_INSERT,
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SW_JACK_PHYSICAL_INSERT,
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SW_VIDEOOUT_INSERT,
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SW_LINEIN_INSERT,
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};
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#endif /* CONFIG_SND_JACK_INPUT_DEV */
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static int snd_jack_dev_disconnect(struct snd_device *device)
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{
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#ifdef CONFIG_SND_JACK_INPUT_DEV
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struct snd_jack *jack = device->device_data;
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if (!jack->input_dev)
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return 0;
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/* If the input device is registered with the input subsystem
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* then we need to use a different deallocator. */
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if (jack->registered)
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input_unregister_device(jack->input_dev);
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else
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input_free_device(jack->input_dev);
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jack->input_dev = NULL;
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#endif /* CONFIG_SND_JACK_INPUT_DEV */
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return 0;
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}
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static int snd_jack_dev_free(struct snd_device *device)
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{
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struct snd_jack *jack = device->device_data;
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struct snd_card *card = device->card;
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struct snd_jack_kctl *jack_kctl, *tmp_jack_kctl;
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list_for_each_entry_safe(jack_kctl, tmp_jack_kctl, &jack->kctl_list, list) {
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list_del_init(&jack_kctl->list);
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snd_ctl_remove(card, jack_kctl->kctl);
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}
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if (jack->private_free)
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jack->private_free(jack);
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snd_jack_dev_disconnect(device);
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kfree(jack->id);
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kfree(jack);
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return 0;
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}
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#ifdef CONFIG_SND_JACK_INPUT_DEV
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static int snd_jack_dev_register(struct snd_device *device)
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{
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struct snd_jack *jack = device->device_data;
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struct snd_card *card = device->card;
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int err, i;
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snprintf(jack->name, sizeof(jack->name), "%s %s",
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card->shortname, jack->id);
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if (!jack->input_dev)
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return 0;
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jack->input_dev->name = jack->name;
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/* Default to the sound card device. */
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if (!jack->input_dev->dev.parent)
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jack->input_dev->dev.parent = snd_card_get_device_link(card);
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/* Add capabilities for any keys that are enabled */
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for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
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int testbit = SND_JACK_BTN_0 >> i;
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if (!(jack->type & testbit))
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continue;
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if (!jack->key[i])
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jack->key[i] = BTN_0 + i;
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input_set_capability(jack->input_dev, EV_KEY, jack->key[i]);
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}
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err = input_register_device(jack->input_dev);
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if (err == 0)
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jack->registered = 1;
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return err;
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}
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#endif /* CONFIG_SND_JACK_INPUT_DEV */
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#ifdef CONFIG_SND_JACK_INJECTION_DEBUG
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static void snd_jack_inject_report(struct snd_jack_kctl *jack_kctl, int status)
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{
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struct snd_jack *jack;
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#ifdef CONFIG_SND_JACK_INPUT_DEV
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int i;
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#endif
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if (!jack_kctl)
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return;
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jack = jack_kctl->jack;
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if (jack_kctl->sw_inject_enable)
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snd_kctl_jack_report(jack->card, jack_kctl->kctl,
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status & jack_kctl->mask_bits);
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#ifdef CONFIG_SND_JACK_INPUT_DEV
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if (!jack->input_dev)
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return;
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for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
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int testbit = ((SND_JACK_BTN_0 >> i) & jack_kctl->mask_bits);
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if (jack->type & testbit)
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input_report_key(jack->input_dev, jack->key[i],
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status & testbit);
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}
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for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) {
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int testbit = ((1 << i) & jack_kctl->mask_bits);
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if (jack->type & testbit)
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input_report_switch(jack->input_dev,
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jack_switch_types[i],
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status & testbit);
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}
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input_sync(jack->input_dev);
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#endif /* CONFIG_SND_JACK_INPUT_DEV */
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}
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static ssize_t sw_inject_enable_read(struct file *file,
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char __user *to, size_t count, loff_t *ppos)
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{
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struct snd_jack_kctl *jack_kctl = file->private_data;
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int len, ret;
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char buf[128];
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len = scnprintf(buf, sizeof(buf), "%s: %s\t\t%s: %i\n", "Jack", jack_kctl->kctl->id.name,
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"Inject Enabled", jack_kctl->sw_inject_enable);
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ret = simple_read_from_buffer(to, count, ppos, buf, len);
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return ret;
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}
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static ssize_t sw_inject_enable_write(struct file *file,
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const char __user *from, size_t count, loff_t *ppos)
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{
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struct snd_jack_kctl *jack_kctl = file->private_data;
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int ret, err;
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unsigned long enable;
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char buf[8] = { 0 };
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ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, from, count);
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err = kstrtoul(buf, 0, &enable);
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if (err)
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return err;
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if (jack_kctl->sw_inject_enable == (!!enable))
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return ret;
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jack_kctl->sw_inject_enable = !!enable;
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if (!jack_kctl->sw_inject_enable)
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snd_jack_report(jack_kctl->jack, jack_kctl->jack->hw_status_cache);
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return ret;
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}
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static ssize_t jackin_inject_write(struct file *file,
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const char __user *from, size_t count, loff_t *ppos)
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{
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struct snd_jack_kctl *jack_kctl = file->private_data;
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int ret, err;
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unsigned long enable;
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char buf[8] = { 0 };
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if (!jack_kctl->sw_inject_enable)
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return -EINVAL;
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ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, from, count);
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err = kstrtoul(buf, 0, &enable);
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if (err)
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return err;
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snd_jack_inject_report(jack_kctl, !!enable ? jack_kctl->mask_bits : 0);
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return ret;
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}
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static ssize_t jack_kctl_id_read(struct file *file,
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char __user *to, size_t count, loff_t *ppos)
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{
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struct snd_jack_kctl *jack_kctl = file->private_data;
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char buf[64];
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int len, ret;
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len = scnprintf(buf, sizeof(buf), "%s\n", jack_kctl->kctl->id.name);
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ret = simple_read_from_buffer(to, count, ppos, buf, len);
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return ret;
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}
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/* the bit definition is aligned with snd_jack_types in jack.h */
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static const char * const jack_events_name[] = {
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"HEADPHONE(0x0001)", "MICROPHONE(0x0002)", "LINEOUT(0x0004)",
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"MECHANICAL(0x0008)", "VIDEOOUT(0x0010)", "LINEIN(0x0020)",
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"", "", "", "BTN_5(0x0200)", "BTN_4(0x0400)", "BTN_3(0x0800)",
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"BTN_2(0x1000)", "BTN_1(0x2000)", "BTN_0(0x4000)", "",
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};
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/* the recommended buffer size is 256 */
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static int parse_mask_bits(unsigned int mask_bits, char *buf, size_t buf_size)
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{
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int i;
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scnprintf(buf, buf_size, "0x%04x", mask_bits);
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for (i = 0; i < ARRAY_SIZE(jack_events_name); i++)
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if (mask_bits & (1 << i)) {
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strlcat(buf, " ", buf_size);
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strlcat(buf, jack_events_name[i], buf_size);
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}
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strlcat(buf, "\n", buf_size);
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return strlen(buf);
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}
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static ssize_t jack_kctl_mask_bits_read(struct file *file,
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char __user *to, size_t count, loff_t *ppos)
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{
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struct snd_jack_kctl *jack_kctl = file->private_data;
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char buf[256];
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int len, ret;
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len = parse_mask_bits(jack_kctl->mask_bits, buf, sizeof(buf));
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ret = simple_read_from_buffer(to, count, ppos, buf, len);
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return ret;
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}
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static ssize_t jack_kctl_status_read(struct file *file,
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char __user *to, size_t count, loff_t *ppos)
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{
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struct snd_jack_kctl *jack_kctl = file->private_data;
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char buf[16];
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int len, ret;
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len = scnprintf(buf, sizeof(buf), "%s\n", jack_kctl->kctl->private_value ?
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"Plugged" : "Unplugged");
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ret = simple_read_from_buffer(to, count, ppos, buf, len);
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return ret;
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}
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#ifdef CONFIG_SND_JACK_INPUT_DEV
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static ssize_t jack_type_read(struct file *file,
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char __user *to, size_t count, loff_t *ppos)
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{
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struct snd_jack_kctl *jack_kctl = file->private_data;
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char buf[256];
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int len, ret;
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len = parse_mask_bits(jack_kctl->jack->type, buf, sizeof(buf));
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ret = simple_read_from_buffer(to, count, ppos, buf, len);
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return ret;
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}
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static const struct file_operations jack_type_fops = {
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.open = simple_open,
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.read = jack_type_read,
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.llseek = default_llseek,
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};
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#endif
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static const struct file_operations sw_inject_enable_fops = {
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.open = simple_open,
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.read = sw_inject_enable_read,
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.write = sw_inject_enable_write,
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.llseek = default_llseek,
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};
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static const struct file_operations jackin_inject_fops = {
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.open = simple_open,
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.write = jackin_inject_write,
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.llseek = default_llseek,
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};
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static const struct file_operations jack_kctl_id_fops = {
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.open = simple_open,
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.read = jack_kctl_id_read,
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.llseek = default_llseek,
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};
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static const struct file_operations jack_kctl_mask_bits_fops = {
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.open = simple_open,
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.read = jack_kctl_mask_bits_read,
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.llseek = default_llseek,
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};
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static const struct file_operations jack_kctl_status_fops = {
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.open = simple_open,
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.read = jack_kctl_status_read,
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.llseek = default_llseek,
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};
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static int snd_jack_debugfs_add_inject_node(struct snd_jack *jack,
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struct snd_jack_kctl *jack_kctl)
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{
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char *tname;
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int i;
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/* Don't create injection interface for Phantom jacks */
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if (strstr(jack_kctl->kctl->id.name, "Phantom"))
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return 0;
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tname = kstrdup(jack_kctl->kctl->id.name, GFP_KERNEL);
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if (!tname)
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return -ENOMEM;
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/* replace the chars which are not suitable for folder's name with _ */
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for (i = 0; tname[i]; i++)
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if (!isalnum(tname[i]))
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tname[i] = '_';
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jack_kctl->jack_debugfs_root = debugfs_create_dir(tname, jack->card->debugfs_root);
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kfree(tname);
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debugfs_create_file("sw_inject_enable", 0644, jack_kctl->jack_debugfs_root, jack_kctl,
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&sw_inject_enable_fops);
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debugfs_create_file("jackin_inject", 0200, jack_kctl->jack_debugfs_root, jack_kctl,
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&jackin_inject_fops);
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debugfs_create_file("kctl_id", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
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&jack_kctl_id_fops);
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debugfs_create_file("mask_bits", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
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&jack_kctl_mask_bits_fops);
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debugfs_create_file("status", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
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&jack_kctl_status_fops);
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#ifdef CONFIG_SND_JACK_INPUT_DEV
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debugfs_create_file("type", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
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&jack_type_fops);
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#endif
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return 0;
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}
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static void snd_jack_debugfs_clear_inject_node(struct snd_jack_kctl *jack_kctl)
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{
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debugfs_remove(jack_kctl->jack_debugfs_root);
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jack_kctl->jack_debugfs_root = NULL;
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}
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#else /* CONFIG_SND_JACK_INJECTION_DEBUG */
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static int snd_jack_debugfs_add_inject_node(struct snd_jack *jack,
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struct snd_jack_kctl *jack_kctl)
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{
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return 0;
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}
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static void snd_jack_debugfs_clear_inject_node(struct snd_jack_kctl *jack_kctl)
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{
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}
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#endif /* CONFIG_SND_JACK_INJECTION_DEBUG */
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static void snd_jack_kctl_private_free(struct snd_kcontrol *kctl)
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{
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struct snd_jack_kctl *jack_kctl;
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jack_kctl = kctl->private_data;
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if (jack_kctl) {
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snd_jack_debugfs_clear_inject_node(jack_kctl);
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list_del(&jack_kctl->list);
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kfree(jack_kctl);
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}
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}
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static void snd_jack_kctl_add(struct snd_jack *jack, struct snd_jack_kctl *jack_kctl)
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{
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jack_kctl->jack = jack;
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list_add_tail(&jack_kctl->list, &jack->kctl_list);
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snd_jack_debugfs_add_inject_node(jack, jack_kctl);
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}
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static struct snd_jack_kctl * snd_jack_kctl_new(struct snd_card *card, const char *name, unsigned int mask)
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{
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struct snd_kcontrol *kctl;
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struct snd_jack_kctl *jack_kctl;
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int err;
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kctl = snd_kctl_jack_new(name, card);
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if (!kctl)
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return NULL;
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err = snd_ctl_add(card, kctl);
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if (err < 0)
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return NULL;
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jack_kctl = kzalloc(sizeof(*jack_kctl), GFP_KERNEL);
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if (!jack_kctl)
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goto error;
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jack_kctl->kctl = kctl;
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jack_kctl->mask_bits = mask;
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kctl->private_data = jack_kctl;
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kctl->private_free = snd_jack_kctl_private_free;
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return jack_kctl;
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error:
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snd_ctl_free_one(kctl);
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return NULL;
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}
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/**
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* snd_jack_add_new_kctl - Create a new snd_jack_kctl and add it to jack
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* @jack: the jack instance which the kctl will attaching to
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* @name: the name for the snd_kcontrol object
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* @mask: a bitmask of enum snd_jack_type values that can be detected
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* by this snd_jack_kctl object.
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*
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* Creates a new snd_kcontrol object and adds it to the jack kctl_list.
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*
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* Return: Zero if successful, or a negative error code on failure.
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*/
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int snd_jack_add_new_kctl(struct snd_jack *jack, const char * name, int mask)
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{
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struct snd_jack_kctl *jack_kctl;
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jack_kctl = snd_jack_kctl_new(jack->card, name, mask);
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if (!jack_kctl)
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return -ENOMEM;
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snd_jack_kctl_add(jack, jack_kctl);
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return 0;
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}
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EXPORT_SYMBOL(snd_jack_add_new_kctl);
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/**
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* snd_jack_new - Create a new jack
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* @card: the card instance
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* @id: an identifying string for this jack
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* @type: a bitmask of enum snd_jack_type values that can be detected by
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* this jack
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* @jjack: Used to provide the allocated jack object to the caller.
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* @initial_kctl: if true, create a kcontrol and add it to the jack list.
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* @phantom_jack: Don't create a input device for phantom jacks.
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*
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* Creates a new jack object.
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*
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* Return: Zero if successful, or a negative error code on failure.
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* On success @jjack will be initialised.
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*/
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int snd_jack_new(struct snd_card *card, const char *id, int type,
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struct snd_jack **jjack, bool initial_kctl, bool phantom_jack)
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{
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struct snd_jack *jack;
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struct snd_jack_kctl *jack_kctl = NULL;
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int err;
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static const struct snd_device_ops ops = {
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.dev_free = snd_jack_dev_free,
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#ifdef CONFIG_SND_JACK_INPUT_DEV
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|
.dev_register = snd_jack_dev_register,
|
|
.dev_disconnect = snd_jack_dev_disconnect,
|
|
#endif /* CONFIG_SND_JACK_INPUT_DEV */
|
|
};
|
|
|
|
if (initial_kctl) {
|
|
jack_kctl = snd_jack_kctl_new(card, id, type);
|
|
if (!jack_kctl)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
|
|
if (jack == NULL)
|
|
return -ENOMEM;
|
|
|
|
jack->id = kstrdup(id, GFP_KERNEL);
|
|
|
|
/* don't creat input device for phantom jack */
|
|
if (!phantom_jack) {
|
|
#ifdef CONFIG_SND_JACK_INPUT_DEV
|
|
int i;
|
|
|
|
jack->input_dev = input_allocate_device();
|
|
if (jack->input_dev == NULL) {
|
|
err = -ENOMEM;
|
|
goto fail_input;
|
|
}
|
|
|
|
jack->input_dev->phys = "ALSA";
|
|
|
|
jack->type = type;
|
|
|
|
for (i = 0; i < SND_JACK_SWITCH_TYPES; i++)
|
|
if (type & (1 << i))
|
|
input_set_capability(jack->input_dev, EV_SW,
|
|
jack_switch_types[i]);
|
|
|
|
#endif /* CONFIG_SND_JACK_INPUT_DEV */
|
|
}
|
|
|
|
err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
|
|
if (err < 0)
|
|
goto fail_input;
|
|
|
|
jack->card = card;
|
|
INIT_LIST_HEAD(&jack->kctl_list);
|
|
|
|
if (initial_kctl)
|
|
snd_jack_kctl_add(jack, jack_kctl);
|
|
|
|
*jjack = jack;
|
|
|
|
return 0;
|
|
|
|
fail_input:
|
|
#ifdef CONFIG_SND_JACK_INPUT_DEV
|
|
input_free_device(jack->input_dev);
|
|
#endif
|
|
kfree(jack->id);
|
|
kfree(jack);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(snd_jack_new);
|
|
|
|
#ifdef CONFIG_SND_JACK_INPUT_DEV
|
|
/**
|
|
* snd_jack_set_parent - Set the parent device for a jack
|
|
*
|
|
* @jack: The jack to configure
|
|
* @parent: The device to set as parent for the jack.
|
|
*
|
|
* Set the parent for the jack devices in the device tree. This
|
|
* function is only valid prior to registration of the jack. If no
|
|
* parent is configured then the parent device will be the sound card.
|
|
*/
|
|
void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
|
|
{
|
|
WARN_ON(jack->registered);
|
|
if (!jack->input_dev)
|
|
return;
|
|
|
|
jack->input_dev->dev.parent = parent;
|
|
}
|
|
EXPORT_SYMBOL(snd_jack_set_parent);
|
|
|
|
/**
|
|
* snd_jack_set_key - Set a key mapping on a jack
|
|
*
|
|
* @jack: The jack to configure
|
|
* @type: Jack report type for this key
|
|
* @keytype: Input layer key type to be reported
|
|
*
|
|
* Map a SND_JACK_BTN_* button type to an input layer key, allowing
|
|
* reporting of keys on accessories via the jack abstraction. If no
|
|
* mapping is provided but keys are enabled in the jack type then
|
|
* BTN_n numeric buttons will be reported.
|
|
*
|
|
* If jacks are not reporting via the input API this call will have no
|
|
* effect.
|
|
*
|
|
* Note that this is intended to be use by simple devices with small
|
|
* numbers of keys that can be reported. It is also possible to
|
|
* access the input device directly - devices with complex input
|
|
* capabilities on accessories should consider doing this rather than
|
|
* using this abstraction.
|
|
*
|
|
* This function may only be called prior to registration of the jack.
|
|
*
|
|
* Return: Zero if successful, or a negative error code on failure.
|
|
*/
|
|
int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
|
|
int keytype)
|
|
{
|
|
int key = fls(SND_JACK_BTN_0) - fls(type);
|
|
|
|
WARN_ON(jack->registered);
|
|
|
|
if (!keytype || key >= ARRAY_SIZE(jack->key))
|
|
return -EINVAL;
|
|
|
|
jack->type |= type;
|
|
jack->key[key] = keytype;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(snd_jack_set_key);
|
|
#endif /* CONFIG_SND_JACK_INPUT_DEV */
|
|
|
|
/**
|
|
* snd_jack_report - Report the current status of a jack
|
|
*
|
|
* @jack: The jack to report status for
|
|
* @status: The current status of the jack
|
|
*/
|
|
void snd_jack_report(struct snd_jack *jack, int status)
|
|
{
|
|
struct snd_jack_kctl *jack_kctl;
|
|
unsigned int mask_bits = 0;
|
|
#ifdef CONFIG_SND_JACK_INPUT_DEV
|
|
int i;
|
|
#endif
|
|
|
|
if (!jack)
|
|
return;
|
|
|
|
jack->hw_status_cache = status;
|
|
|
|
list_for_each_entry(jack_kctl, &jack->kctl_list, list)
|
|
if (jack_kctl->sw_inject_enable)
|
|
mask_bits |= jack_kctl->mask_bits;
|
|
else
|
|
snd_kctl_jack_report(jack->card, jack_kctl->kctl,
|
|
status & jack_kctl->mask_bits);
|
|
|
|
#ifdef CONFIG_SND_JACK_INPUT_DEV
|
|
if (!jack->input_dev)
|
|
return;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
|
|
int testbit = ((SND_JACK_BTN_0 >> i) & ~mask_bits);
|
|
|
|
if (jack->type & testbit)
|
|
input_report_key(jack->input_dev, jack->key[i],
|
|
status & testbit);
|
|
}
|
|
|
|
for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) {
|
|
int testbit = ((1 << i) & ~mask_bits);
|
|
|
|
if (jack->type & testbit)
|
|
input_report_switch(jack->input_dev,
|
|
jack_switch_types[i],
|
|
status & testbit);
|
|
}
|
|
|
|
input_sync(jack->input_dev);
|
|
#endif /* CONFIG_SND_JACK_INPUT_DEV */
|
|
}
|
|
EXPORT_SYMBOL(snd_jack_report);
|