summaryrefslogtreecommitdiffstats
path: root/sound/soc/codecs/rt5677-spi.c
blob: ef6348cb9157df056450e78c9caf8c9ace0cf9ee (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/*
 * rt5677-spi.c  --  RT5677 ALSA SoC audio codec driver
 *
 * Copyright 2013 Realtek Semiconductor Corp.
 * Author: Oder Chiou <oder_chiou@realtek.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/input.h>
#include <linux/spi/spi.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_qos.h>
#include <linux/sysfs.h>
#include <linux/clk.h>
#include <linux/firmware.h>

#include "rt5677-spi.h"

static struct spi_device *g_spi;

/**
 * rt5677_spi_write - Write data to SPI.
 * @txbuf: Data Buffer for writing.
 * @len: Data length.
 *
 *
 * Returns true for success.
 */
int rt5677_spi_write(u8 *txbuf, size_t len)
{
	int status;

	status = spi_write(g_spi, txbuf, len);

	if (status)
		dev_err(&g_spi->dev, "rt5677_spi_write error %d\n", status);

	return status;
}
EXPORT_SYMBOL_GPL(rt5677_spi_write);

/**
 * rt5677_spi_burst_write - Write data to SPI by rt5677 dsp memory address.
 * @addr: Start address.
 * @txbuf: Data Buffer for writng.
 * @len: Data length, it must be a multiple of 8.
 *
 *
 * Returns true for success.
 */
int rt5677_spi_burst_write(u32 addr, const struct firmware *fw)
{
	u8 spi_cmd = RT5677_SPI_CMD_BURST_WRITE;
	u8 *write_buf;
	unsigned int i, end, offset = 0;

	write_buf = kmalloc(RT5677_SPI_BUF_LEN + 6, GFP_KERNEL);

	if (write_buf == NULL)
		return -ENOMEM;

	while (offset < fw->size) {
		if (offset + RT5677_SPI_BUF_LEN <= fw->size)
			end = RT5677_SPI_BUF_LEN;
		else
			end = fw->size % RT5677_SPI_BUF_LEN;

		write_buf[0] = spi_cmd;
		write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
		write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
		write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
		write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;

		for (i = 0; i < end; i += 8) {
			write_buf[i + 12] = fw->data[offset + i + 0];
			write_buf[i + 11] = fw->data[offset + i + 1];
			write_buf[i + 10] = fw->data[offset + i + 2];
			write_buf[i +  9] = fw->data[offset + i + 3];
			write_buf[i +  8] = fw->data[offset + i + 4];
			write_buf[i +  7] = fw->data[offset + i + 5];
			write_buf[i +  6] = fw->data[offset + i + 6];
			write_buf[i +  5] = fw->data[offset + i + 7];
		}

		write_buf[end + 5] = spi_cmd;

		rt5677_spi_write(write_buf, end + 6);

		offset += RT5677_SPI_BUF_LEN;
	}

	kfree(write_buf);

	return 0;
}
EXPORT_SYMBOL_GPL(rt5677_spi_burst_write);

static int rt5677_spi_probe(struct spi_device *spi)
{
	g_spi = spi;
	return 0;
}

static struct spi_driver rt5677_spi_driver = {
	.driver = {
		.name = "rt5677",
		.owner = THIS_MODULE,
	},
	.probe = rt5677_spi_probe,
};
module_spi_driver(rt5677_spi_driver);

MODULE_DESCRIPTION("ASoC RT5677 SPI driver");
MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud