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-rw-r--r--sound/core/jack.c699
1 files changed, 699 insertions, 0 deletions
diff --git a/sound/core/jack.c b/sound/core/jack.c
new file mode 100644
index 000000000..03d155ed3
--- /dev/null
+++ b/sound/core/jack.c
@@ -0,0 +1,699 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Jack abstraction layer
+ *
+ * Copyright 2008 Wolfson Microelectronics
+ */
+
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/mm.h>
+#include <linux/debugfs.h>
+#include <sound/jack.h>
+#include <sound/core.h>
+#include <sound/control.h>
+
+struct snd_jack_kctl {
+ struct snd_kcontrol *kctl;
+ struct list_head list; /* list of controls belong to the same jack */
+ unsigned int mask_bits; /* only masked status bits are reported via kctl */
+ struct snd_jack *jack; /* pointer to struct snd_jack */
+ bool sw_inject_enable; /* allow to inject plug event via debugfs */
+#ifdef CONFIG_SND_JACK_INJECTION_DEBUG
+ struct dentry *jack_debugfs_root; /* jack_kctl debugfs root */
+#endif
+};
+
+#ifdef CONFIG_SND_JACK_INPUT_DEV
+static const int jack_switch_types[SND_JACK_SWITCH_TYPES] = {
+ SW_HEADPHONE_INSERT,
+ SW_MICROPHONE_INSERT,
+ SW_LINEOUT_INSERT,
+ SW_JACK_PHYSICAL_INSERT,
+ SW_VIDEOOUT_INSERT,
+ SW_LINEIN_INSERT,
+};
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
+
+static int snd_jack_dev_disconnect(struct snd_device *device)
+{
+#ifdef CONFIG_SND_JACK_INPUT_DEV
+ struct snd_jack *jack = device->device_data;
+
+ mutex_lock(&jack->input_dev_lock);
+ if (!jack->input_dev) {
+ mutex_unlock(&jack->input_dev_lock);
+ return 0;
+ }
+
+ /* If the input device is registered with the input subsystem
+ * then we need to use a different deallocator. */
+ if (jack->registered)
+ input_unregister_device(jack->input_dev);
+ else
+ input_free_device(jack->input_dev);
+ jack->input_dev = NULL;
+ mutex_unlock(&jack->input_dev_lock);
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
+ return 0;
+}
+
+static int snd_jack_dev_free(struct snd_device *device)
+{
+ struct snd_jack *jack = device->device_data;
+ struct snd_card *card = device->card;
+ struct snd_jack_kctl *jack_kctl, *tmp_jack_kctl;
+
+ down_write(&card->controls_rwsem);
+ list_for_each_entry_safe(jack_kctl, tmp_jack_kctl, &jack->kctl_list, list) {
+ list_del_init(&jack_kctl->list);
+ snd_ctl_remove(card, jack_kctl->kctl);
+ }
+ up_write(&card->controls_rwsem);
+
+ if (jack->private_free)
+ jack->private_free(jack);
+
+ snd_jack_dev_disconnect(device);
+
+ kfree(jack->id);
+ kfree(jack);
+
+ return 0;
+}
+
+#ifdef CONFIG_SND_JACK_INPUT_DEV
+static int snd_jack_dev_register(struct snd_device *device)
+{
+ struct snd_jack *jack = device->device_data;
+ struct snd_card *card = device->card;
+ int err, i;
+
+ snprintf(jack->name, sizeof(jack->name), "%s %s",
+ card->shortname, jack->id);
+
+ mutex_lock(&jack->input_dev_lock);
+ if (!jack->input_dev) {
+ mutex_unlock(&jack->input_dev_lock);
+ return 0;
+ }
+
+ jack->input_dev->name = jack->name;
+
+ /* Default to the sound card device. */
+ if (!jack->input_dev->dev.parent)
+ jack->input_dev->dev.parent = snd_card_get_device_link(card);
+
+ /* Add capabilities for any keys that are enabled */
+ for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
+ int testbit = SND_JACK_BTN_0 >> i;
+
+ if (!(jack->type & testbit))
+ continue;
+
+ if (!jack->key[i])
+ jack->key[i] = BTN_0 + i;
+
+ input_set_capability(jack->input_dev, EV_KEY, jack->key[i]);
+ }
+
+ err = input_register_device(jack->input_dev);
+ if (err == 0)
+ jack->registered = 1;
+
+ mutex_unlock(&jack->input_dev_lock);
+ return err;
+}
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
+
+#ifdef CONFIG_SND_JACK_INJECTION_DEBUG
+static void snd_jack_inject_report(struct snd_jack_kctl *jack_kctl, int status)
+{
+ struct snd_jack *jack;
+#ifdef CONFIG_SND_JACK_INPUT_DEV
+ int i;
+#endif
+ if (!jack_kctl)
+ return;
+
+ jack = jack_kctl->jack;
+
+ if (jack_kctl->sw_inject_enable)
+ 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) & jack_kctl->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) & jack_kctl->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 */
+}
+
+static ssize_t sw_inject_enable_read(struct file *file,
+ char __user *to, size_t count, loff_t *ppos)
+{
+ struct snd_jack_kctl *jack_kctl = file->private_data;
+ int len, ret;
+ char buf[128];
+
+ len = scnprintf(buf, sizeof(buf), "%s: %s\t\t%s: %i\n", "Jack", jack_kctl->kctl->id.name,
+ "Inject Enabled", jack_kctl->sw_inject_enable);
+ ret = simple_read_from_buffer(to, count, ppos, buf, len);
+
+ return ret;
+}
+
+static ssize_t sw_inject_enable_write(struct file *file,
+ const char __user *from, size_t count, loff_t *ppos)
+{
+ struct snd_jack_kctl *jack_kctl = file->private_data;
+ int ret, err;
+ unsigned long enable;
+ char buf[8] = { 0 };
+
+ ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, from, count);
+ err = kstrtoul(buf, 0, &enable);
+ if (err)
+ return err;
+
+ if (jack_kctl->sw_inject_enable == (!!enable))
+ return ret;
+
+ jack_kctl->sw_inject_enable = !!enable;
+
+ if (!jack_kctl->sw_inject_enable)
+ snd_jack_report(jack_kctl->jack, jack_kctl->jack->hw_status_cache);
+
+ return ret;
+}
+
+static ssize_t jackin_inject_write(struct file *file,
+ const char __user *from, size_t count, loff_t *ppos)
+{
+ struct snd_jack_kctl *jack_kctl = file->private_data;
+ int ret, err;
+ unsigned long enable;
+ char buf[8] = { 0 };
+
+ if (!jack_kctl->sw_inject_enable)
+ return -EINVAL;
+
+ ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, from, count);
+ err = kstrtoul(buf, 0, &enable);
+ if (err)
+ return err;
+
+ snd_jack_inject_report(jack_kctl, !!enable ? jack_kctl->mask_bits : 0);
+
+ return ret;
+}
+
+static ssize_t jack_kctl_id_read(struct file *file,
+ char __user *to, size_t count, loff_t *ppos)
+{
+ struct snd_jack_kctl *jack_kctl = file->private_data;
+ char buf[64];
+ int len, ret;
+
+ len = scnprintf(buf, sizeof(buf), "%s\n", jack_kctl->kctl->id.name);
+ ret = simple_read_from_buffer(to, count, ppos, buf, len);
+
+ return ret;
+}
+
+/* the bit definition is aligned with snd_jack_types in jack.h */
+static const char * const jack_events_name[] = {
+ "HEADPHONE(0x0001)", "MICROPHONE(0x0002)", "LINEOUT(0x0004)",
+ "MECHANICAL(0x0008)", "VIDEOOUT(0x0010)", "LINEIN(0x0020)",
+ "", "", "", "BTN_5(0x0200)", "BTN_4(0x0400)", "BTN_3(0x0800)",
+ "BTN_2(0x1000)", "BTN_1(0x2000)", "BTN_0(0x4000)", "",
+};
+
+/* the recommended buffer size is 256 */
+static int parse_mask_bits(unsigned int mask_bits, char *buf, size_t buf_size)
+{
+ int i;
+
+ scnprintf(buf, buf_size, "0x%04x", mask_bits);
+
+ for (i = 0; i < ARRAY_SIZE(jack_events_name); i++)
+ if (mask_bits & (1 << i)) {
+ strlcat(buf, " ", buf_size);
+ strlcat(buf, jack_events_name[i], buf_size);
+ }
+ strlcat(buf, "\n", buf_size);
+
+ return strlen(buf);
+}
+
+static ssize_t jack_kctl_mask_bits_read(struct file *file,
+ char __user *to, size_t count, loff_t *ppos)
+{
+ struct snd_jack_kctl *jack_kctl = file->private_data;
+ char buf[256];
+ int len, ret;
+
+ len = parse_mask_bits(jack_kctl->mask_bits, buf, sizeof(buf));
+ ret = simple_read_from_buffer(to, count, ppos, buf, len);
+
+ return ret;
+}
+
+static ssize_t jack_kctl_status_read(struct file *file,
+ char __user *to, size_t count, loff_t *ppos)
+{
+ struct snd_jack_kctl *jack_kctl = file->private_data;
+ char buf[16];
+ int len, ret;
+
+ len = scnprintf(buf, sizeof(buf), "%s\n", jack_kctl->kctl->private_value ?
+ "Plugged" : "Unplugged");
+ ret = simple_read_from_buffer(to, count, ppos, buf, len);
+
+ return ret;
+}
+
+#ifdef CONFIG_SND_JACK_INPUT_DEV
+static ssize_t jack_type_read(struct file *file,
+ char __user *to, size_t count, loff_t *ppos)
+{
+ struct snd_jack_kctl *jack_kctl = file->private_data;
+ char buf[256];
+ int len, ret;
+
+ len = parse_mask_bits(jack_kctl->jack->type, buf, sizeof(buf));
+ ret = simple_read_from_buffer(to, count, ppos, buf, len);
+
+ return ret;
+}
+
+static const struct file_operations jack_type_fops = {
+ .open = simple_open,
+ .read = jack_type_read,
+ .llseek = default_llseek,
+};
+#endif
+
+static const struct file_operations sw_inject_enable_fops = {
+ .open = simple_open,
+ .read = sw_inject_enable_read,
+ .write = sw_inject_enable_write,
+ .llseek = default_llseek,
+};
+
+static const struct file_operations jackin_inject_fops = {
+ .open = simple_open,
+ .write = jackin_inject_write,
+ .llseek = default_llseek,
+};
+
+static const struct file_operations jack_kctl_id_fops = {
+ .open = simple_open,
+ .read = jack_kctl_id_read,
+ .llseek = default_llseek,
+};
+
+static const struct file_operations jack_kctl_mask_bits_fops = {
+ .open = simple_open,
+ .read = jack_kctl_mask_bits_read,
+ .llseek = default_llseek,
+};
+
+static const struct file_operations jack_kctl_status_fops = {
+ .open = simple_open,
+ .read = jack_kctl_status_read,
+ .llseek = default_llseek,
+};
+
+static int snd_jack_debugfs_add_inject_node(struct snd_jack *jack,
+ struct snd_jack_kctl *jack_kctl)
+{
+ char *tname;
+ int i;
+
+ /* Don't create injection interface for Phantom jacks */
+ if (strstr(jack_kctl->kctl->id.name, "Phantom"))
+ return 0;
+
+ tname = kstrdup(jack_kctl->kctl->id.name, GFP_KERNEL);
+ if (!tname)
+ return -ENOMEM;
+
+ /* replace the chars which are not suitable for folder's name with _ */
+ for (i = 0; tname[i]; i++)
+ if (!isalnum(tname[i]))
+ tname[i] = '_';
+
+ jack_kctl->jack_debugfs_root = debugfs_create_dir(tname, jack->card->debugfs_root);
+ kfree(tname);
+
+ debugfs_create_file("sw_inject_enable", 0644, jack_kctl->jack_debugfs_root, jack_kctl,
+ &sw_inject_enable_fops);
+
+ debugfs_create_file("jackin_inject", 0200, jack_kctl->jack_debugfs_root, jack_kctl,
+ &jackin_inject_fops);
+
+ debugfs_create_file("kctl_id", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
+ &jack_kctl_id_fops);
+
+ debugfs_create_file("mask_bits", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
+ &jack_kctl_mask_bits_fops);
+
+ debugfs_create_file("status", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
+ &jack_kctl_status_fops);
+
+#ifdef CONFIG_SND_JACK_INPUT_DEV
+ debugfs_create_file("type", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
+ &jack_type_fops);
+#endif
+ return 0;
+}
+
+static void snd_jack_debugfs_clear_inject_node(struct snd_jack_kctl *jack_kctl)
+{
+ debugfs_remove(jack_kctl->jack_debugfs_root);
+ jack_kctl->jack_debugfs_root = NULL;
+}
+#else /* CONFIG_SND_JACK_INJECTION_DEBUG */
+static int snd_jack_debugfs_add_inject_node(struct snd_jack *jack,
+ struct snd_jack_kctl *jack_kctl)
+{
+ return 0;
+}
+
+static void snd_jack_debugfs_clear_inject_node(struct snd_jack_kctl *jack_kctl)
+{
+}
+#endif /* CONFIG_SND_JACK_INJECTION_DEBUG */
+
+static void snd_jack_kctl_private_free(struct snd_kcontrol *kctl)
+{
+ struct snd_jack_kctl *jack_kctl;
+
+ jack_kctl = kctl->private_data;
+ if (jack_kctl) {
+ snd_jack_debugfs_clear_inject_node(jack_kctl);
+ list_del(&jack_kctl->list);
+ kfree(jack_kctl);
+ }
+}
+
+static void snd_jack_kctl_add(struct snd_jack *jack, struct snd_jack_kctl *jack_kctl)
+{
+ jack_kctl->jack = jack;
+ list_add_tail(&jack_kctl->list, &jack->kctl_list);
+ snd_jack_debugfs_add_inject_node(jack, jack_kctl);
+}
+
+static struct snd_jack_kctl * snd_jack_kctl_new(struct snd_card *card, const char *name, unsigned int mask)
+{
+ struct snd_kcontrol *kctl;
+ struct snd_jack_kctl *jack_kctl;
+ int err;
+
+ kctl = snd_kctl_jack_new(name, card);
+ if (!kctl)
+ return NULL;
+
+ err = snd_ctl_add(card, kctl);
+ if (err < 0)
+ return NULL;
+
+ jack_kctl = kzalloc(sizeof(*jack_kctl), GFP_KERNEL);
+
+ if (!jack_kctl)
+ goto error;
+
+ jack_kctl->kctl = kctl;
+ jack_kctl->mask_bits = mask;
+
+ kctl->private_data = jack_kctl;
+ kctl->private_free = snd_jack_kctl_private_free;
+
+ return jack_kctl;
+error:
+ snd_ctl_free_one(kctl);
+ return NULL;
+}
+
+/**
+ * snd_jack_add_new_kctl - Create a new snd_jack_kctl and add it to jack
+ * @jack: the jack instance which the kctl will attaching to
+ * @name: the name for the snd_kcontrol object
+ * @mask: a bitmask of enum snd_jack_type values that can be detected
+ * by this snd_jack_kctl object.
+ *
+ * Creates a new snd_kcontrol object and adds it to the jack kctl_list.
+ *
+ * Return: Zero if successful, or a negative error code on failure.
+ */
+int snd_jack_add_new_kctl(struct snd_jack *jack, const char * name, int mask)
+{
+ struct snd_jack_kctl *jack_kctl;
+
+ jack_kctl = snd_jack_kctl_new(jack->card, name, mask);
+ if (!jack_kctl)
+ return -ENOMEM;
+
+ snd_jack_kctl_add(jack, jack_kctl);
+ return 0;
+}
+EXPORT_SYMBOL(snd_jack_add_new_kctl);
+
+/**
+ * snd_jack_new - Create a new jack
+ * @card: the card instance
+ * @id: an identifying string for this jack
+ * @type: a bitmask of enum snd_jack_type values that can be detected by
+ * this jack
+ * @jjack: Used to provide the allocated jack object to the caller.
+ * @initial_kctl: if true, create a kcontrol and add it to the jack list.
+ * @phantom_jack: Don't create a input device for phantom jacks.
+ *
+ * Creates a new jack object.
+ *
+ * Return: Zero if successful, or a negative error code on failure.
+ * On success @jjack will be initialised.
+ */
+int snd_jack_new(struct snd_card *card, const char *id, int type,
+ struct snd_jack **jjack, bool initial_kctl, bool phantom_jack)
+{
+ struct snd_jack *jack;
+ struct snd_jack_kctl *jack_kctl = NULL;
+ int err;
+ static const struct snd_device_ops ops = {
+ .dev_free = snd_jack_dev_free,
+#ifdef CONFIG_SND_JACK_INPUT_DEV
+ .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);
+ if (jack->id == NULL) {
+ kfree(jack);
+ return -ENOMEM;
+ }
+
+#ifdef CONFIG_SND_JACK_INPUT_DEV
+ mutex_init(&jack->input_dev_lock);
+
+ /* don't create input device for phantom jack */
+ if (!phantom_jack) {
+ 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);
+ mutex_lock(&jack->input_dev_lock);
+ if (!jack->input_dev) {
+ mutex_unlock(&jack->input_dev_lock);
+ return;
+ }
+
+ jack->input_dev->dev.parent = parent;
+ mutex_unlock(&jack->input_dev_lock);
+}
+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
+ * Note: This function uses mutexes and should be called from a
+ * context which can sleep (such as a workqueue).
+ *
+ * @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
+ struct input_dev *idev;
+ 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
+ idev = input_get_device(jack->input_dev);
+ if (!idev)
+ 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(idev, 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(idev,
+ jack_switch_types[i],
+ status & testbit);
+ }
+
+ input_sync(idev);
+ input_put_device(idev);
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
+}
+EXPORT_SYMBOL(snd_jack_report);