| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Load Analog Devices SigmaStudio firmware files |
| 4 | * |
| 5 | * Copyright 2009-2011 Analog Devices Inc. |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 6 | */ |
| 7 | |
| 8 | #include <linux/export.h> |
| 9 | #include <linux/i2c.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <asm/unaligned.h> |
| 13 | |
| 14 | #include "sigmadsp.h" |
| 15 | |
| 16 | static int sigmadsp_write_i2c(void *control_data, |
| 17 | unsigned int addr, const uint8_t data[], size_t len) |
| 18 | { |
| 19 | uint8_t *buf; |
| 20 | int ret; |
| 21 | |
| 22 | buf = kzalloc(2 + len, GFP_KERNEL | GFP_DMA); |
| 23 | if (!buf) |
| 24 | return -ENOMEM; |
| 25 | |
| 26 | put_unaligned_be16(addr, buf); |
| 27 | memcpy(buf + 2, data, len); |
| 28 | |
| 29 | ret = i2c_master_send(control_data, buf, len + 2); |
| 30 | |
| 31 | kfree(buf); |
| 32 | |
| 33 | if (ret < 0) |
| 34 | return ret; |
| 35 | |
| 36 | return 0; |
| 37 | } |
| 38 | |
| 39 | static int sigmadsp_read_i2c(void *control_data, |
| 40 | unsigned int addr, uint8_t data[], size_t len) |
| 41 | { |
| 42 | struct i2c_client *client = control_data; |
| 43 | struct i2c_msg msgs[2]; |
| 44 | uint8_t buf[2]; |
| 45 | int ret; |
| 46 | |
| 47 | put_unaligned_be16(addr, buf); |
| 48 | |
| 49 | msgs[0].addr = client->addr; |
| 50 | msgs[0].len = sizeof(buf); |
| 51 | msgs[0].buf = buf; |
| 52 | msgs[0].flags = 0; |
| 53 | |
| 54 | msgs[1].addr = client->addr; |
| 55 | msgs[1].len = len; |
| 56 | msgs[1].buf = data; |
| 57 | msgs[1].flags = I2C_M_RD; |
| 58 | |
| 59 | ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); |
| 60 | if (ret < 0) |
| 61 | return ret; |
| 62 | else if (ret != ARRAY_SIZE(msgs)) |
| 63 | return -EIO; |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * devm_sigmadsp_init_i2c() - Initialize SigmaDSP instance |
| 69 | * @client: The parent I2C device |
| 70 | * @ops: The sigmadsp_ops to use for this instance |
| 71 | * @firmware_name: Name of the firmware file to load |
| 72 | * |
| 73 | * Allocates a SigmaDSP instance and loads the specified firmware file. |
| 74 | * |
| 75 | * Returns a pointer to a struct sigmadsp on success, or a PTR_ERR() on error. |
| 76 | */ |
| 77 | struct sigmadsp *devm_sigmadsp_init_i2c(struct i2c_client *client, |
| 78 | const struct sigmadsp_ops *ops, const char *firmware_name) |
| 79 | { |
| 80 | struct sigmadsp *sigmadsp; |
| 81 | |
| 82 | sigmadsp = devm_sigmadsp_init(&client->dev, ops, firmware_name); |
| 83 | if (IS_ERR(sigmadsp)) |
| 84 | return sigmadsp; |
| 85 | |
| 86 | sigmadsp->control_data = client; |
| 87 | sigmadsp->write = sigmadsp_write_i2c; |
| 88 | sigmadsp->read = sigmadsp_read_i2c; |
| 89 | |
| 90 | return sigmadsp; |
| 91 | } |
| 92 | EXPORT_SYMBOL_GPL(devm_sigmadsp_init_i2c); |
| 93 | |
| 94 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); |
| 95 | MODULE_DESCRIPTION("SigmaDSP I2C firmware loader"); |
| 96 | MODULE_LICENSE("GPL"); |