diff options
Diffstat (limited to 'sound/soc/codecs/sigmadsp.c')
| -rw-r--r-- | sound/soc/codecs/sigmadsp.c | 812 |
1 files changed, 812 insertions, 0 deletions
diff --git a/sound/soc/codecs/sigmadsp.c b/sound/soc/codecs/sigmadsp.c new file mode 100644 index 000000000..76c77dc8e --- /dev/null +++ b/sound/soc/codecs/sigmadsp.c @@ -0,0 +1,812 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Load Analog Devices SigmaStudio firmware files + * + * Copyright 2009-2014 Analog Devices Inc. + */ + +#include <linux/crc32.h> +#include <linux/firmware.h> +#include <linux/kernel.h> +#include <linux/i2c.h> +#include <linux/regmap.h> +#include <linux/module.h> +#include <linux/slab.h> + +#include <sound/control.h> +#include <sound/soc.h> + +#include "sigmadsp.h" + +#define SIGMA_MAGIC "ADISIGM" + +#define SIGMA_FW_CHUNK_TYPE_DATA 0 +#define SIGMA_FW_CHUNK_TYPE_CONTROL 1 +#define SIGMA_FW_CHUNK_TYPE_SAMPLERATES 2 + +struct sigmadsp_control { + struct list_head head; + uint32_t samplerates; + unsigned int addr; + unsigned int num_bytes; + const char *name; + struct snd_kcontrol *kcontrol; + bool cached; + uint8_t cache[]; +}; + +struct sigmadsp_data { + struct list_head head; + uint32_t samplerates; + unsigned int addr; + unsigned int length; + uint8_t data[]; +}; + +struct sigma_fw_chunk { + __le32 length; + __le32 tag; + __le32 samplerates; +} __packed; + +struct sigma_fw_chunk_data { + struct sigma_fw_chunk chunk; + __le16 addr; + uint8_t data[]; +} __packed; + +struct sigma_fw_chunk_control { + struct sigma_fw_chunk chunk; + __le16 type; + __le16 addr; + __le16 num_bytes; + const char name[]; +} __packed; + +struct sigma_fw_chunk_samplerate { + struct sigma_fw_chunk chunk; + __le32 samplerates[]; +} __packed; + +struct sigma_firmware_header { + unsigned char magic[7]; + u8 version; + __le32 crc; +} __packed; + +enum { + SIGMA_ACTION_WRITEXBYTES = 0, + SIGMA_ACTION_WRITESINGLE, + SIGMA_ACTION_WRITESAFELOAD, + SIGMA_ACTION_END, +}; + +struct sigma_action { + u8 instr; + u8 len_hi; + __le16 len; + __be16 addr; + unsigned char payload[]; +} __packed; + +static int sigmadsp_write(struct sigmadsp *sigmadsp, unsigned int addr, + const uint8_t data[], size_t len) +{ + return sigmadsp->write(sigmadsp->control_data, addr, data, len); +} + +static int sigmadsp_read(struct sigmadsp *sigmadsp, unsigned int addr, + uint8_t data[], size_t len) +{ + return sigmadsp->read(sigmadsp->control_data, addr, data, len); +} + +static int sigmadsp_ctrl_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *info) +{ + struct sigmadsp_control *ctrl = (void *)kcontrol->private_value; + + info->type = SNDRV_CTL_ELEM_TYPE_BYTES; + info->count = ctrl->num_bytes; + + return 0; +} + +static int sigmadsp_ctrl_write(struct sigmadsp *sigmadsp, + struct sigmadsp_control *ctrl, void *data) +{ + /* safeload loads up to 20 bytes in a atomic operation */ + if (ctrl->num_bytes <= 20 && sigmadsp->ops && sigmadsp->ops->safeload) + return sigmadsp->ops->safeload(sigmadsp, ctrl->addr, data, + ctrl->num_bytes); + else + return sigmadsp_write(sigmadsp, ctrl->addr, data, + ctrl->num_bytes); +} + +static int sigmadsp_ctrl_put(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct sigmadsp_control *ctrl = (void *)kcontrol->private_value; + struct sigmadsp *sigmadsp = snd_kcontrol_chip(kcontrol); + uint8_t *data; + int ret = 0; + + mutex_lock(&sigmadsp->lock); + + data = ucontrol->value.bytes.data; + + if (!(kcontrol->vd[0].access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)) + ret = sigmadsp_ctrl_write(sigmadsp, ctrl, data); + + if (ret == 0) { + memcpy(ctrl->cache, data, ctrl->num_bytes); + ctrl->cached = true; + } + + mutex_unlock(&sigmadsp->lock); + + return ret; +} + +static int sigmadsp_ctrl_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct sigmadsp_control *ctrl = (void *)kcontrol->private_value; + struct sigmadsp *sigmadsp = snd_kcontrol_chip(kcontrol); + int ret = 0; + + mutex_lock(&sigmadsp->lock); + + if (!ctrl->cached) { + ret = sigmadsp_read(sigmadsp, ctrl->addr, ctrl->cache, + ctrl->num_bytes); + } + + if (ret == 0) { + ctrl->cached = true; + memcpy(ucontrol->value.bytes.data, ctrl->cache, + ctrl->num_bytes); + } + + mutex_unlock(&sigmadsp->lock); + + return ret; +} + +static void sigmadsp_control_free(struct snd_kcontrol *kcontrol) +{ + struct sigmadsp_control *ctrl = (void *)kcontrol->private_value; + + ctrl->kcontrol = NULL; +} + +static bool sigma_fw_validate_control_name(const char *name, unsigned int len) +{ + unsigned int i; + + for (i = 0; i < len; i++) { + /* Normal ASCII characters are valid */ + if (name[i] < ' ' || name[i] > '~') + return false; + } + + return true; +} + +static int sigma_fw_load_control(struct sigmadsp *sigmadsp, + const struct sigma_fw_chunk *chunk, unsigned int length) +{ + const struct sigma_fw_chunk_control *ctrl_chunk; + struct sigmadsp_control *ctrl; + unsigned int num_bytes; + size_t name_len; + char *name; + int ret; + + if (length <= sizeof(*ctrl_chunk)) + return -EINVAL; + + ctrl_chunk = (const struct sigma_fw_chunk_control *)chunk; + + name_len = length - sizeof(*ctrl_chunk); + if (name_len >= SNDRV_CTL_ELEM_ID_NAME_MAXLEN) + name_len = SNDRV_CTL_ELEM_ID_NAME_MAXLEN - 1; + + /* Make sure there are no non-displayable characaters in the string */ + if (!sigma_fw_validate_control_name(ctrl_chunk->name, name_len)) + return -EINVAL; + + num_bytes = le16_to_cpu(ctrl_chunk->num_bytes); + ctrl = kzalloc(sizeof(*ctrl) + num_bytes, GFP_KERNEL); + if (!ctrl) + return -ENOMEM; + + name = kzalloc(name_len + 1, GFP_KERNEL); + if (!name) { + ret = -ENOMEM; + goto err_free_ctrl; + } + memcpy(name, ctrl_chunk->name, name_len); + name[name_len] = '\0'; + ctrl->name = name; + + ctrl->addr = le16_to_cpu(ctrl_chunk->addr); + ctrl->num_bytes = num_bytes; + ctrl->samplerates = le32_to_cpu(chunk->samplerates); + + list_add_tail(&ctrl->head, &sigmadsp->ctrl_list); + + return 0; + +err_free_ctrl: + kfree(ctrl); + + return ret; +} + +static int sigma_fw_load_data(struct sigmadsp *sigmadsp, + const struct sigma_fw_chunk *chunk, unsigned int length) +{ + const struct sigma_fw_chunk_data *data_chunk; + struct sigmadsp_data *data; + + if (length <= sizeof(*data_chunk)) + return -EINVAL; + + data_chunk = (struct sigma_fw_chunk_data *)chunk; + + length -= sizeof(*data_chunk); + + data = kzalloc(sizeof(*data) + length, GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->addr = le16_to_cpu(data_chunk->addr); + data->length = length; + data->samplerates = le32_to_cpu(chunk->samplerates); + memcpy(data->data, data_chunk->data, length); + list_add_tail(&data->head, &sigmadsp->data_list); + + return 0; +} + +static int sigma_fw_load_samplerates(struct sigmadsp *sigmadsp, + const struct sigma_fw_chunk *chunk, unsigned int length) +{ + const struct sigma_fw_chunk_samplerate *rate_chunk; + unsigned int num_rates; + unsigned int *rates; + unsigned int i; + + rate_chunk = (const struct sigma_fw_chunk_samplerate *)chunk; + + num_rates = (length - sizeof(*rate_chunk)) / sizeof(__le32); + + if (num_rates > 32 || num_rates == 0) + return -EINVAL; + + /* We only allow one samplerates block per file */ + if (sigmadsp->rate_constraints.count) + return -EINVAL; + + rates = kcalloc(num_rates, sizeof(*rates), GFP_KERNEL); + if (!rates) + return -ENOMEM; + + for (i = 0; i < num_rates; i++) + rates[i] = le32_to_cpu(rate_chunk->samplerates[i]); + + sigmadsp->rate_constraints.count = num_rates; + sigmadsp->rate_constraints.list = rates; + + return 0; +} + +static int sigmadsp_fw_load_v2(struct sigmadsp *sigmadsp, + const struct firmware *fw) +{ + struct sigma_fw_chunk *chunk; + unsigned int length, pos; + int ret; + + /* + * Make sure that there is at least one chunk to avoid integer + * underflows later on. Empty firmware is still valid though. + */ + if (fw->size < sizeof(*chunk) + sizeof(struct sigma_firmware_header)) + return 0; + + pos = sizeof(struct sigma_firmware_header); + + while (pos < fw->size - sizeof(*chunk)) { + chunk = (struct sigma_fw_chunk *)(fw->data + pos); + + length = le32_to_cpu(chunk->length); + + if (length > fw->size - pos || length < sizeof(*chunk)) + return -EINVAL; + + switch (le32_to_cpu(chunk->tag)) { + case SIGMA_FW_CHUNK_TYPE_DATA: + ret = sigma_fw_load_data(sigmadsp, chunk, length); + break; + case SIGMA_FW_CHUNK_TYPE_CONTROL: + ret = sigma_fw_load_control(sigmadsp, chunk, length); + break; + case SIGMA_FW_CHUNK_TYPE_SAMPLERATES: + ret = sigma_fw_load_samplerates(sigmadsp, chunk, length); + break; + default: + dev_warn(sigmadsp->dev, "Unknown chunk type: %d\n", + chunk->tag); + ret = 0; + break; + } + + if (ret) + return ret; + + /* + * This can not overflow since if length is larger than the + * maximum firmware size (0x4000000) we'll error out earilier. + */ + pos += ALIGN(length, sizeof(__le32)); + } + + return 0; +} + +static inline u32 sigma_action_len(struct sigma_action *sa) +{ + return (sa->len_hi << 16) | le16_to_cpu(sa->len); +} + +static size_t sigma_action_size(struct sigma_action *sa) +{ + size_t payload = 0; + + switch (sa->instr) { + case SIGMA_ACTION_WRITEXBYTES: + case SIGMA_ACTION_WRITESINGLE: + case SIGMA_ACTION_WRITESAFELOAD: + payload = sigma_action_len(sa); + break; + default: + break; + } + + payload = ALIGN(payload, 2); + + return payload + sizeof(struct sigma_action); +} + +/* + * Returns a negative error value in case of an error, 0 if processing of + * the firmware should be stopped after this action, 1 otherwise. + */ +static int process_sigma_action(struct sigmadsp *sigmadsp, + struct sigma_action *sa) +{ + size_t len = sigma_action_len(sa); + struct sigmadsp_data *data; + + pr_debug("%s: instr:%i addr:%#x len:%zu\n", __func__, + sa->instr, sa->addr, len); + + switch (sa->instr) { + case SIGMA_ACTION_WRITEXBYTES: + case SIGMA_ACTION_WRITESINGLE: + case SIGMA_ACTION_WRITESAFELOAD: + if (len < 3) + return -EINVAL; + + data = kzalloc(sizeof(*data) + len - 2, GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->addr = be16_to_cpu(sa->addr); + data->length = len - 2; + memcpy(data->data, sa->payload, data->length); + list_add_tail(&data->head, &sigmadsp->data_list); + break; + case SIGMA_ACTION_END: + return 0; + default: + return -EINVAL; + } + + return 1; +} + +static int sigmadsp_fw_load_v1(struct sigmadsp *sigmadsp, + const struct firmware *fw) +{ + struct sigma_action *sa; + size_t size, pos; + int ret; + + pos = sizeof(struct sigma_firmware_header); + + while (pos + sizeof(*sa) <= fw->size) { + sa = (struct sigma_action *)(fw->data + pos); + + size = sigma_action_size(sa); + pos += size; + if (pos > fw->size || size == 0) + break; + + ret = process_sigma_action(sigmadsp, sa); + + pr_debug("%s: action returned %i\n", __func__, ret); + + if (ret <= 0) + return ret; + } + + if (pos != fw->size) + return -EINVAL; + + return 0; +} + +static void sigmadsp_firmware_release(struct sigmadsp *sigmadsp) +{ + struct sigmadsp_control *ctrl, *_ctrl; + struct sigmadsp_data *data, *_data; + + list_for_each_entry_safe(ctrl, _ctrl, &sigmadsp->ctrl_list, head) { + kfree(ctrl->name); + kfree(ctrl); + } + + list_for_each_entry_safe(data, _data, &sigmadsp->data_list, head) + kfree(data); + + INIT_LIST_HEAD(&sigmadsp->ctrl_list); + INIT_LIST_HEAD(&sigmadsp->data_list); +} + +static void devm_sigmadsp_release(struct device *dev, void *res) +{ + sigmadsp_firmware_release((struct sigmadsp *)res); +} + +static int sigmadsp_firmware_load(struct sigmadsp *sigmadsp, const char *name) +{ + const struct sigma_firmware_header *ssfw_head; + const struct firmware *fw; + int ret; + u32 crc; + + /* first load the blob */ + ret = request_firmware(&fw, name, sigmadsp->dev); + if (ret) { + pr_debug("%s: request_firmware() failed with %i\n", __func__, ret); + goto done; + } + + /* then verify the header */ + ret = -EINVAL; + + /* + * Reject too small or unreasonable large files. The upper limit has been + * chosen a bit arbitrarily, but it should be enough for all practical + * purposes and having the limit makes it easier to avoid integer + * overflows later in the loading process. + */ + if (fw->size < sizeof(*ssfw_head) || fw->size >= 0x4000000) { + dev_err(sigmadsp->dev, "Failed to load firmware: Invalid size\n"); + goto done; + } + + ssfw_head = (void *)fw->data; + if (memcmp(ssfw_head->magic, SIGMA_MAGIC, ARRAY_SIZE(ssfw_head->magic))) { + dev_err(sigmadsp->dev, "Failed to load firmware: Invalid magic\n"); + goto done; + } + + crc = crc32(0, fw->data + sizeof(*ssfw_head), + fw->size - sizeof(*ssfw_head)); + pr_debug("%s: crc=%x\n", __func__, crc); + if (crc != le32_to_cpu(ssfw_head->crc)) { + dev_err(sigmadsp->dev, "Failed to load firmware: Wrong crc checksum: expected %x got %x\n", + le32_to_cpu(ssfw_head->crc), crc); + goto done; + } + + switch (ssfw_head->version) { + case 1: + ret = sigmadsp_fw_load_v1(sigmadsp, fw); + break; + case 2: + ret = sigmadsp_fw_load_v2(sigmadsp, fw); + break; + default: + dev_err(sigmadsp->dev, + "Failed to load firmware: Invalid version %d. Supported firmware versions: 1, 2\n", + ssfw_head->version); + ret = -EINVAL; + break; + } + + if (ret) + sigmadsp_firmware_release(sigmadsp); + +done: + release_firmware(fw); + + return ret; +} + +static int sigmadsp_init(struct sigmadsp *sigmadsp, struct device *dev, + const struct sigmadsp_ops *ops, const char *firmware_name) +{ + sigmadsp->ops = ops; + sigmadsp->dev = dev; + + INIT_LIST_HEAD(&sigmadsp->ctrl_list); + INIT_LIST_HEAD(&sigmadsp->data_list); + mutex_init(&sigmadsp->lock); + + return sigmadsp_firmware_load(sigmadsp, firmware_name); +} + +/** + * devm_sigmadsp_init() - Initialize SigmaDSP instance + * @dev: The parent device + * @ops: The sigmadsp_ops to use for this instance + * @firmware_name: Name of the firmware file to load + * + * Allocates a SigmaDSP instance and loads the specified firmware file. + * + * Returns a pointer to a struct sigmadsp on success, or a PTR_ERR() on error. + */ +struct sigmadsp *devm_sigmadsp_init(struct device *dev, + const struct sigmadsp_ops *ops, const char *firmware_name) +{ + struct sigmadsp *sigmadsp; + int ret; + + sigmadsp = devres_alloc(devm_sigmadsp_release, sizeof(*sigmadsp), + GFP_KERNEL); + if (!sigmadsp) + return ERR_PTR(-ENOMEM); + + ret = sigmadsp_init(sigmadsp, dev, ops, firmware_name); + if (ret) { + devres_free(sigmadsp); + return ERR_PTR(ret); + } + + devres_add(dev, sigmadsp); + + return sigmadsp; +} +EXPORT_SYMBOL_GPL(devm_sigmadsp_init); + +static int sigmadsp_rate_to_index(struct sigmadsp *sigmadsp, unsigned int rate) +{ + unsigned int i; + + for (i = 0; i < sigmadsp->rate_constraints.count; i++) { + if (sigmadsp->rate_constraints.list[i] == rate) + return i; + } + + return -EINVAL; +} + +static unsigned int sigmadsp_get_samplerate_mask(struct sigmadsp *sigmadsp, + unsigned int samplerate) +{ + int samplerate_index; + + if (samplerate == 0) + return 0; + + if (sigmadsp->rate_constraints.count) { + samplerate_index = sigmadsp_rate_to_index(sigmadsp, samplerate); + if (samplerate_index < 0) + return 0; + + return BIT(samplerate_index); + } else { + return ~0; + } +} + +static bool sigmadsp_samplerate_valid(unsigned int supported, + unsigned int requested) +{ + /* All samplerates are supported */ + if (!supported) + return true; + + return supported & requested; +} + +static int sigmadsp_alloc_control(struct sigmadsp *sigmadsp, + struct sigmadsp_control *ctrl, unsigned int samplerate_mask) +{ + struct snd_kcontrol_new template; + struct snd_kcontrol *kcontrol; + + memset(&template, 0, sizeof(template)); + template.iface = SNDRV_CTL_ELEM_IFACE_MIXER; + template.name = ctrl->name; + template.info = sigmadsp_ctrl_info; + template.get = sigmadsp_ctrl_get; + template.put = sigmadsp_ctrl_put; + template.private_value = (unsigned long)ctrl; + template.access = SNDRV_CTL_ELEM_ACCESS_READWRITE; + if (!sigmadsp_samplerate_valid(ctrl->samplerates, samplerate_mask)) + template.access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE; + + kcontrol = snd_ctl_new1(&template, sigmadsp); + if (!kcontrol) + return -ENOMEM; + + kcontrol->private_free = sigmadsp_control_free; + ctrl->kcontrol = kcontrol; + + return snd_ctl_add(sigmadsp->component->card->snd_card, kcontrol); +} + +static void sigmadsp_activate_ctrl(struct sigmadsp *sigmadsp, + struct sigmadsp_control *ctrl, unsigned int samplerate_mask) +{ + struct snd_card *card = sigmadsp->component->card->snd_card; + struct snd_kcontrol_volatile *vd; + struct snd_ctl_elem_id id; + bool active; + bool changed = false; + + active = sigmadsp_samplerate_valid(ctrl->samplerates, samplerate_mask); + + down_write(&card->controls_rwsem); + if (!ctrl->kcontrol) { + up_write(&card->controls_rwsem); + return; + } + + id = ctrl->kcontrol->id; + vd = &ctrl->kcontrol->vd[0]; + if (active == (bool)(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)) { + vd->access ^= SNDRV_CTL_ELEM_ACCESS_INACTIVE; + changed = true; + } + up_write(&card->controls_rwsem); + + if (active && changed) { + mutex_lock(&sigmadsp->lock); + if (ctrl->cached) + sigmadsp_ctrl_write(sigmadsp, ctrl, ctrl->cache); + mutex_unlock(&sigmadsp->lock); + } + + if (changed) + snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, &id); +} + +/** + * sigmadsp_attach() - Attach a sigmadsp instance to a ASoC component + * @sigmadsp: The sigmadsp instance to attach + * @component: The component to attach to + * + * Typically called in the components probe callback. + * + * Note, once this function has been called the firmware must not be released + * until after the ALSA snd_card that the component belongs to has been + * disconnected, even if sigmadsp_attach() returns an error. + */ +int sigmadsp_attach(struct sigmadsp *sigmadsp, + struct snd_soc_component *component) +{ + struct sigmadsp_control *ctrl; + unsigned int samplerate_mask; + int ret; + + sigmadsp->component = component; + + samplerate_mask = sigmadsp_get_samplerate_mask(sigmadsp, + sigmadsp->current_samplerate); + + list_for_each_entry(ctrl, &sigmadsp->ctrl_list, head) { + ret = sigmadsp_alloc_control(sigmadsp, ctrl, samplerate_mask); + if (ret) + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(sigmadsp_attach); + +/** + * sigmadsp_setup() - Setup the DSP for the specified samplerate + * @sigmadsp: The sigmadsp instance to configure + * @samplerate: The samplerate the DSP should be configured for + * + * Loads the appropriate firmware program and parameter memory (if not already + * loaded) and enables the controls for the specified samplerate. Any control + * parameter changes that have been made previously will be restored. + * + * Returns 0 on success, a negative error code otherwise. + */ +int sigmadsp_setup(struct sigmadsp *sigmadsp, unsigned int samplerate) +{ + struct sigmadsp_control *ctrl; + unsigned int samplerate_mask; + struct sigmadsp_data *data; + int ret; + + if (sigmadsp->current_samplerate == samplerate) + return 0; + + samplerate_mask = sigmadsp_get_samplerate_mask(sigmadsp, samplerate); + if (samplerate_mask == 0) + return -EINVAL; + + list_for_each_entry(data, &sigmadsp->data_list, head) { + if (!sigmadsp_samplerate_valid(data->samplerates, + samplerate_mask)) + continue; + ret = sigmadsp_write(sigmadsp, data->addr, data->data, + data->length); + if (ret) + goto err; + } + + list_for_each_entry(ctrl, &sigmadsp->ctrl_list, head) + sigmadsp_activate_ctrl(sigmadsp, ctrl, samplerate_mask); + + sigmadsp->current_samplerate = samplerate; + + return 0; +err: + sigmadsp_reset(sigmadsp); + + return ret; +} +EXPORT_SYMBOL_GPL(sigmadsp_setup); + +/** + * sigmadsp_reset() - Notify the sigmadsp instance that the DSP has been reset + * @sigmadsp: The sigmadsp instance to reset + * + * Should be called whenever the DSP has been reset and parameter and program + * memory need to be re-loaded. + */ +void sigmadsp_reset(struct sigmadsp *sigmadsp) +{ + struct sigmadsp_control *ctrl; + + list_for_each_entry(ctrl, &sigmadsp->ctrl_list, head) + sigmadsp_activate_ctrl(sigmadsp, ctrl, false); + + sigmadsp->current_samplerate = 0; +} +EXPORT_SYMBOL_GPL(sigmadsp_reset); + +/** + * sigmadsp_restrict_params() - Applies DSP firmware specific constraints + * @sigmadsp: The sigmadsp instance + * @substream: The substream to restrict + * + * Applies samplerate constraints that may be required by the firmware Should + * typically be called from the CODEC/component drivers startup callback. + * + * Returns 0 on success, a negative error code otherwise. + */ +int sigmadsp_restrict_params(struct sigmadsp *sigmadsp, + struct snd_pcm_substream *substream) +{ + if (sigmadsp->rate_constraints.count == 0) + return 0; + + return snd_pcm_hw_constraint_list(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_RATE, &sigmadsp->rate_constraints); +} +EXPORT_SYMBOL_GPL(sigmadsp_restrict_params); + +MODULE_LICENSE("GPL"); |