2 * rt5677-spi.c -- RT5677 ALSA SoC audio codec driver
4 * Copyright 2013 Realtek Semiconductor Corp.
5 * Author: Oder Chiou <oder_chiou@realtek.com>
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.
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>
32 #include "rt5677-spi.h"
34 static struct spi_device *g_spi;
37 * rt5677_spi_write - Write data to SPI.
38 * @txbuf: Data Buffer for writing.
42 * Returns true for success.
44 int rt5677_spi_write(u8 *txbuf, size_t len)
48 status = spi_write(g_spi, txbuf, len);
51 dev_err(&g_spi->dev, "rt5677_spi_write error %d\n", status);
55 EXPORT_SYMBOL_GPL(rt5677_spi_write);
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.
64 * Returns true for success.
66 int rt5677_spi_burst_write(u32 addr, const struct firmware *fw)
68 u8 spi_cmd = RT5677_SPI_CMD_BURST_WRITE;
70 unsigned int i, end, offset = 0;
72 write_buf = kmalloc(RT5677_SPI_BUF_LEN + 6, GFP_KERNEL);
74 if (write_buf == NULL)
77 while (offset < fw->size) {
78 if (offset + RT5677_SPI_BUF_LEN <= fw->size)
79 end = RT5677_SPI_BUF_LEN;
81 end = fw->size % RT5677_SPI_BUF_LEN;
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;
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];
100 write_buf[end + 5] = spi_cmd;
102 rt5677_spi_write(write_buf, end + 6);
104 offset += RT5677_SPI_BUF_LEN;
111 EXPORT_SYMBOL_GPL(rt5677_spi_burst_write);
113 static int rt5677_spi_probe(struct spi_device *spi)
119 static struct spi_driver rt5677_spi_driver = {
122 .owner = THIS_MODULE,
124 .probe = rt5677_spi_probe,
126 module_spi_driver(rt5677_spi_driver);
128 MODULE_DESCRIPTION("ASoC RT5677 SPI driver");
129 MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
130 MODULE_LICENSE("GPL v2");