linux/sound/soc/codecs/sigmadsp.c
Lars-Peter Clausen 2488708f5c ASoC: sigmadsp: Split regmap and I2C support into separate modules
When the SigmaDSP module is built-in, but the I2C core is build as a module
we'll get a undefined reference:

	sound/built-in.o: In function `sigma_action_write_i2c':
		:(.text+0x5d8d4): undefined reference to `i2c_master_send'

This can happen if a audio driver that is using the regmap SigmaDSP interface is
built into the kernel, but core I2C support is build as a module. To fix this
split the SigmaDSP module into three modules, one module providing the core
infrastructure and two small modules implementing the regmap and I2C interfaces.
This allows e.g. the core infrastructure and regmap support to be built into the
kernel while I2C support can still be build as a module.

Fixes: dab464b60 ("ASoC: Add ADAU1361/ADAU1761 audio CODEC support")
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
2014-06-09 21:24:32 +01:00

186 lines
3.9 KiB
C

/*
* 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");