projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 6b10998d LPC |
1 | /* |
| 2 | * Load Analog Devices SigmaStudio firmware files | |
| 3 | * | |
| 4 | * Copyright 2009-2011 Analog Devices Inc. | |
| 5 | * | |
| 6 | * Licensed under the GPL-2 or later. | |
| 7 | */ | |
| 8 | ||
| 6b10998d | 9 | #include <linux/export.h> |
| d48b088e | 10 | #include <linux/i2c.h> |
| 6b10998d | 11 | #include <linux/module.h> |
| d48b088e LPC |
12 | #include <linux/slab.h> |
| 13 | #include <asm/unaligned.h> | |
| 6b10998d LPC |
14 | |
| 15 | #include "sigmadsp.h" | |
| 16 | ||
| d48b088e LPC |
17 | static int sigmadsp_write_i2c(void *control_data, |
| 18 | unsigned int addr, const uint8_t data[], size_t len) | |
| 6b10998d | 19 | { |
| d48b088e LPC |
20 | uint8_t *buf; |
| 21 | int ret; | |
| 22 | ||
| 23 | buf = kzalloc(2 + len, GFP_KERNEL | GFP_DMA); | |
| 24 | if (!buf) | |
| 25 | return -ENOMEM; | |
| 26 | ||
| 27 | put_unaligned_be16(addr, buf); | |
| 28 | memcpy(buf + 2, data, len); | |
| 29 | ||
| 30 | ret = i2c_master_send(control_data, buf, len + 2); | |
| 31 | ||
| 32 | kfree(buf); | |
| 33 | ||
| 61c4a1ac PH |
34 | if (ret < 0) |
| 35 | return ret; | |
| 36 | ||
| 37 | return 0; | |
| 6b10998d LPC |
38 | } |
| 39 | ||
| a35daac7 LPC |
40 | static int sigmadsp_read_i2c(void *control_data, |
| 41 | unsigned int addr, uint8_t data[], size_t len) | |
| 42 | { | |
| 43 | struct i2c_client *client = control_data; | |
| 44 | struct i2c_msg msgs[2]; | |
| 45 | uint8_t buf[2]; | |
| 46 | int ret; | |
| 47 | ||
| 48 | put_unaligned_be16(addr, buf); | |
| 49 | ||
| 50 | msgs[0].addr = client->addr; | |
| 51 | msgs[0].len = sizeof(buf); | |
| 52 | msgs[0].buf = buf; | |
| 53 | msgs[0].flags = 0; | |
| 54 | ||
| 55 | msgs[1].addr = client->addr; | |
| 56 | msgs[1].len = len; | |
| 57 | msgs[1].buf = data; | |
| 58 | msgs[1].flags = I2C_M_RD; | |
| 59 | ||
| 60 | ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); | |
| 61 | if (ret < 0) | |
| 62 | return ret; | |
| 63 | else if (ret != ARRAY_SIZE(msgs)) | |
| 64 | return -EIO; | |
| 65 | return 0; | |
| 66 | } | |
| 67 | ||
| d48b088e LPC |
68 | /** |
| 69 | * devm_sigmadsp_init_i2c() - Initialize SigmaDSP instance | |
| 70 | * @client: The parent I2C device | |
| 71 | * @ops: The sigmadsp_ops to use for this instance | |
| 72 | * @firmware_name: Name of the firmware file to load | |
| 73 | * | |
| 74 | * Allocates a SigmaDSP instance and loads the specified firmware file. | |
| 75 | * | |
| 76 | * Returns a pointer to a struct sigmadsp on success, or a PTR_ERR() on error. | |
| 77 | */ | |
| 78 | struct sigmadsp *devm_sigmadsp_init_i2c(struct i2c_client *client, | |
| 79 | const struct sigmadsp_ops *ops, const char *firmware_name) | |
| 6b10998d | 80 | { |
| d48b088e LPC |
81 | struct sigmadsp *sigmadsp; |
| 82 | ||
| 83 | sigmadsp = devm_sigmadsp_init(&client->dev, ops, firmware_name); | |
| 84 | if (IS_ERR(sigmadsp)) | |
| 85 | return sigmadsp; | |
| 6b10998d | 86 | |
| d48b088e LPC |
87 | sigmadsp->control_data = client; |
| 88 | sigmadsp->write = sigmadsp_write_i2c; | |
| a35daac7 | 89 | sigmadsp->read = sigmadsp_read_i2c; |
| 6b10998d | 90 | |
| d48b088e | 91 | return sigmadsp; |
| 6b10998d | 92 | } |
| d48b088e | 93 | EXPORT_SYMBOL_GPL(devm_sigmadsp_init_i2c); |
| 6b10998d LPC |
94 | |
| 95 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
| 96 | MODULE_DESCRIPTION("SigmaDSP I2C firmware loader"); | |
| 97 | MODULE_LICENSE("GPL"); |