2 * Load Analog Devices SigmaStudio firmware files
4 * Copyright 2009-2011 Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
9 #include <linux/crc32.h>
10 #include <linux/delay.h>
11 #include <linux/firmware.h>
12 #include <linux/kernel.h>
13 #include <linux/i2c.h>
14 #include <linux/regmap.h>
15 #include <linux/module.h>
19 #define SIGMA_MAGIC "ADISIGM"
21 struct sigma_firmware_header {
22 unsigned char magic[7];
28 SIGMA_ACTION_WRITEXBYTES = 0,
29 SIGMA_ACTION_WRITESINGLE,
30 SIGMA_ACTION_WRITESAFELOAD,
42 unsigned char payload[];
45 struct sigma_firmware {
46 const struct firmware *fw;
50 int (*write)(void *control_data, const struct sigma_action *sa,
54 static inline u32 sigma_action_len(struct sigma_action *sa)
56 return (sa->len_hi << 16) | le16_to_cpu(sa->len);
59 static size_t sigma_action_size(struct sigma_action *sa)
64 case SIGMA_ACTION_WRITEXBYTES:
65 case SIGMA_ACTION_WRITESINGLE:
66 case SIGMA_ACTION_WRITESAFELOAD:
67 payload = sigma_action_len(sa);
73 payload = ALIGN(payload, 2);
75 return payload + sizeof(struct sigma_action);
79 * Returns a negative error value in case of an error, 0 if processing of
80 * the firmware should be stopped after this action, 1 otherwise.
83 process_sigma_action(struct sigma_firmware *ssfw, struct sigma_action *sa)
85 size_t len = sigma_action_len(sa);
88 pr_debug("%s: instr:%i addr:%#x len:%zu\n", __func__,
89 sa->instr, sa->addr, len);
92 case SIGMA_ACTION_WRITEXBYTES:
93 case SIGMA_ACTION_WRITESINGLE:
94 case SIGMA_ACTION_WRITESAFELOAD:
95 ret = ssfw->write(ssfw->control_data, sa, len);
99 case SIGMA_ACTION_DELAY:
103 case SIGMA_ACTION_END:
113 process_sigma_actions(struct sigma_firmware *ssfw)
115 struct sigma_action *sa;
119 while (ssfw->pos + sizeof(*sa) <= ssfw->fw->size) {
120 sa = (struct sigma_action *)(ssfw->fw->data + ssfw->pos);
122 size = sigma_action_size(sa);
124 if (ssfw->pos > ssfw->fw->size || size == 0)
127 ret = process_sigma_action(ssfw, sa);
129 pr_debug("%s: action returned %i\n", __func__, ret);
135 if (ssfw->pos != ssfw->fw->size)
141 static int _process_sigma_firmware(struct device *dev,
142 struct sigma_firmware *ssfw, const char *name)
145 struct sigma_firmware_header *ssfw_head;
146 const struct firmware *fw;
149 pr_debug("%s: loading firmware %s\n", __func__, name);
151 /* first load the blob */
152 ret = request_firmware(&fw, name, dev);
154 pr_debug("%s: request_firmware() failed with %i\n", __func__, ret);
159 /* then verify the header */
163 * Reject too small or unreasonable large files. The upper limit has been
164 * chosen a bit arbitrarily, but it should be enough for all practical
165 * purposes and having the limit makes it easier to avoid integer
166 * overflows later in the loading process.
168 if (fw->size < sizeof(*ssfw_head) || fw->size >= 0x4000000) {
169 dev_err(dev, "Failed to load firmware: Invalid size\n");
173 ssfw_head = (void *)fw->data;
174 if (memcmp(ssfw_head->magic, SIGMA_MAGIC, ARRAY_SIZE(ssfw_head->magic))) {
175 dev_err(dev, "Failed to load firmware: Invalid magic\n");
179 crc = crc32(0, fw->data + sizeof(*ssfw_head),
180 fw->size - sizeof(*ssfw_head));
181 pr_debug("%s: crc=%x\n", __func__, crc);
182 if (crc != le32_to_cpu(ssfw_head->crc)) {
183 dev_err(dev, "Failed to load firmware: Wrong crc checksum: expected %x got %x\n",
184 le32_to_cpu(ssfw_head->crc), crc);
188 ssfw->pos = sizeof(*ssfw_head);
190 /* finally process all of the actions */
191 ret = process_sigma_actions(ssfw);
194 release_firmware(fw);
196 pr_debug("%s: loaded %s\n", __func__, name);
201 #if IS_ENABLED(CONFIG_I2C)
203 static int sigma_action_write_i2c(void *control_data,
204 const struct sigma_action *sa, size_t len)
206 return i2c_master_send(control_data, (const unsigned char *)&sa->addr,
210 int process_sigma_firmware(struct i2c_client *client, const char *name)
212 struct sigma_firmware ssfw;
214 ssfw.control_data = client;
215 ssfw.write = sigma_action_write_i2c;
217 return _process_sigma_firmware(&client->dev, &ssfw, name);
219 EXPORT_SYMBOL(process_sigma_firmware);
223 #if IS_ENABLED(CONFIG_REGMAP)
225 static int sigma_action_write_regmap(void *control_data,
226 const struct sigma_action *sa, size_t len)
228 return regmap_raw_write(control_data, be16_to_cpu(sa->addr),
229 sa->payload, len - 2);
232 int process_sigma_firmware_regmap(struct device *dev, struct regmap *regmap,
235 struct sigma_firmware ssfw;
237 ssfw.control_data = regmap;
238 ssfw.write = sigma_action_write_regmap;
240 return _process_sigma_firmware(dev, &ssfw, name);
242 EXPORT_SYMBOL(process_sigma_firmware_regmap);
246 MODULE_LICENSE("GPL");