diff options
Diffstat (limited to 'sound/soc/codecs/sigmadsp.c')
| -rw-r--r-- | sound/soc/codecs/sigmadsp.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/sound/soc/codecs/sigmadsp.c b/sound/soc/codecs/sigmadsp.c new file mode 100644 index 00000000000..f2de7e049bc --- /dev/null +++ b/sound/soc/codecs/sigmadsp.c @@ -0,0 +1,185 @@ +/* + * Load Analog Devices SigmaStudio firmware files + * + * Copyright 2009-2011 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <linux/crc32.h> +#include <linux/delay.h> +#include <linux/firmware.h> +#include <linux/kernel.h> +#include <linux/i2c.h> +#include <linux/regmap.h> +#include <linux/module.h> + +#include "sigmadsp.h" + +#define SIGMA_MAGIC "ADISIGM" + +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_DELAY, + SIGMA_ACTION_PLLWAIT, + SIGMA_ACTION_NOOP, + SIGMA_ACTION_END, +}; + +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 sigma_firmware *ssfw, struct sigma_action *sa) +{ + size_t len = sigma_action_len(sa); + int ret; + + 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: + ret = ssfw->write(ssfw->control_data, sa, len); + if (ret < 0) + return -EINVAL; + break; + case SIGMA_ACTION_DELAY: + udelay(len); + len = 0; + break; + case SIGMA_ACTION_END: + return 0; + default: + return -EINVAL; + } + + return 1; +} + +static int +process_sigma_actions(struct sigma_firmware *ssfw) +{ + struct sigma_action *sa; + size_t size; + int ret; + + while (ssfw->pos + sizeof(*sa) <= ssfw->fw->size) { + sa = (struct sigma_action *)(ssfw->fw->data + ssfw->pos); + + size = sigma_action_size(sa); + ssfw->pos += size; + if (ssfw->pos > ssfw->fw->size || size == 0) + break; + + ret = process_sigma_action(ssfw, sa); + + pr_debug("%s: action returned %i\n", __func__, ret); + + if (ret <= 0) + return ret; + } + + if (ssfw->pos != ssfw->fw->size) + return -EINVAL; + + return 0; +} + +int _process_sigma_firmware(struct device *dev, + struct sigma_firmware *ssfw, const char *name) +{ + int ret; + struct sigma_firmware_header *ssfw_head; + const struct firmware *fw; + u32 crc; + + pr_debug("%s: loading firmware %s\n", __func__, name); + + /* first load the blob */ + ret = request_firmware(&fw, name, dev); + if (ret) { + pr_debug("%s: request_firmware() failed with %i\n", __func__, ret); + return ret; + } + ssfw->fw = fw; + + /* 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(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(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(dev, "Failed to load firmware: Wrong crc checksum: expected %x got %x\n", + le32_to_cpu(ssfw_head->crc), crc); + goto done; + } + + ssfw->pos = sizeof(*ssfw_head); + + /* finally process all of the actions */ + ret = process_sigma_actions(ssfw); + + done: + release_firmware(fw); + + pr_debug("%s: loaded %s\n", __func__, name); + + return ret; +} +EXPORT_SYMBOL_GPL(_process_sigma_firmware); + +MODULE_LICENSE("GPL"); |