linux/sound/soc/codecs/sigmadsp.c

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/*
* Load Analog Devices SigmaStudio firmware files
*
* Copyright 2009-2014 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#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 > 4 && 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");