1/*
2 * rt5677-spi.c  --  RT5677 ALSA SoC audio codec driver
3 *
4 * Copyright 2013 Realtek Semiconductor Corp.
5 * Author: Oder Chiou <oder_chiou@realtek.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/module.h>
13#include <linux/input.h>
14#include <linux/spi/spi.h>
15#include <linux/device.h>
16#include <linux/init.h>
17#include <linux/delay.h>
18#include <linux/interrupt.h>
19#include <linux/irq.h>
20#include <linux/slab.h>
21#include <linux/gpio.h>
22#include <linux/sched.h>
23#include <linux/kthread.h>
24#include <linux/uaccess.h>
25#include <linux/miscdevice.h>
26#include <linux/regulator/consumer.h>
27#include <linux/pm_qos.h>
28#include <linux/sysfs.h>
29#include <linux/clk.h>
30#include <linux/firmware.h>
31
32#include "rt5677-spi.h"
33
34static struct spi_device *g_spi;
35
36/**
37 * rt5677_spi_write - Write data to SPI.
38 * @txbuf: Data Buffer for writing.
39 * @len: Data length.
40 *
41 *
42 * Returns true for success.
43 */
44int rt5677_spi_write(u8 *txbuf, size_t len)
45{
46	int status;
47
48	status = spi_write(g_spi, txbuf, len);
49
50	if (status)
51		dev_err(&g_spi->dev, "rt5677_spi_write error %d\n", status);
52
53	return status;
54}
55EXPORT_SYMBOL_GPL(rt5677_spi_write);
56
57/**
58 * rt5677_spi_burst_write - Write data to SPI by rt5677 dsp memory address.
59 * @addr: Start address.
60 * @txbuf: Data Buffer for writng.
61 * @len: Data length, it must be a multiple of 8.
62 *
63 *
64 * Returns true for success.
65 */
66int rt5677_spi_burst_write(u32 addr, const struct firmware *fw)
67{
68	u8 spi_cmd = RT5677_SPI_CMD_BURST_WRITE;
69	u8 *write_buf;
70	unsigned int i, end, offset = 0;
71
72	write_buf = kmalloc(RT5677_SPI_BUF_LEN + 6, GFP_KERNEL);
73
74	if (write_buf == NULL)
75		return -ENOMEM;
76
77	while (offset < fw->size) {
78		if (offset + RT5677_SPI_BUF_LEN <= fw->size)
79			end = RT5677_SPI_BUF_LEN;
80		else
81			end = fw->size % RT5677_SPI_BUF_LEN;
82
83		write_buf[0] = spi_cmd;
84		write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
85		write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
86		write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
87		write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
88
89		for (i = 0; i < end; i += 8) {
90			write_buf[i + 12] = fw->data[offset + i + 0];
91			write_buf[i + 11] = fw->data[offset + i + 1];
92			write_buf[i + 10] = fw->data[offset + i + 2];
93			write_buf[i +  9] = fw->data[offset + i + 3];
94			write_buf[i +  8] = fw->data[offset + i + 4];
95			write_buf[i +  7] = fw->data[offset + i + 5];
96			write_buf[i +  6] = fw->data[offset + i + 6];
97			write_buf[i +  5] = fw->data[offset + i + 7];
98		}
99
100		write_buf[end + 5] = spi_cmd;
101
102		rt5677_spi_write(write_buf, end + 6);
103
104		offset += RT5677_SPI_BUF_LEN;
105	}
106
107	kfree(write_buf);
108
109	return 0;
110}
111EXPORT_SYMBOL_GPL(rt5677_spi_burst_write);
112
113static int rt5677_spi_probe(struct spi_device *spi)
114{
115	g_spi = spi;
116	return 0;
117}
118
119static struct spi_driver rt5677_spi_driver = {
120	.driver = {
121		.name = "rt5677",
122		.owner = THIS_MODULE,
123	},
124	.probe = rt5677_spi_probe,
125};
126module_spi_driver(rt5677_spi_driver);
127
128MODULE_DESCRIPTION("ASoC RT5677 SPI driver");
129MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
130MODULE_LICENSE("GPL v2");
131