Merge branch 'master' into fixes

1 files changed, 246 insertions, 0 deletions

diff --git a/sound/soc/codecs/sigmadsp.c b/sound/soc/codecs/sigmadsp.c
new file mode 100644
index 000000000000..5be42bf56996
--- /dev/null
+++ b/sound/soc/codecs/sigmadsp.c
@@ -0,0 +1,246 @@
+/*
+ * 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,
+};
+
+struct sigma_action {
+        u8 instr;
+        u8 len_hi;
+        __le16 len;
+        __be16 addr;
+        unsigned char payload[];
+} __packed;
+
+struct sigma_firmware {
+        const struct firmware *fw;
+        size_t pos;
+
+        void *control_data;
+        int (*write)(void *control_data, const struct sigma_action *sa,
+                        size_t len);
+};
+
+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;
+}
+
+static 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;
+}
+
+#if IS_ENABLED(CONFIG_I2C)
+
+static int sigma_action_write_i2c(void *control_data,
+        const struct sigma_action *sa, size_t len)
+{
+        return i2c_master_send(control_data, (const unsigned char *)&sa->addr,
+                len);
+}
+
+int process_sigma_firmware(struct i2c_client *client, const char *name)
+{
+        struct sigma_firmware ssfw;
+
+        ssfw.control_data = client;
+        ssfw.write = sigma_action_write_i2c;
+
+        return _process_sigma_firmware(&client->dev, &ssfw, name);
+}
+EXPORT_SYMBOL(process_sigma_firmware);
+
+#endif
+
+#if IS_ENABLED(CONFIG_REGMAP)
+
+static int sigma_action_write_regmap(void *control_data,
+        const struct sigma_action *sa, size_t len)
+{
+        return regmap_raw_write(control_data, le16_to_cpu(sa->addr),
+                sa->payload, len - 2);
+}
+
+int process_sigma_firmware_regmap(struct device *dev, struct regmap *regmap,
+        const char *name)
+{
+        struct sigma_firmware ssfw;
+
+        ssfw.control_data = regmap;
+        ssfw.write = sigma_action_write_regmap;
+
+        return _process_sigma_firmware(dev, &ssfw, name);
+}
+EXPORT_SYMBOL(process_sigma_firmware_regmap);
+
+#endif
+
+MODULE_LICENSE("GPL");