projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| af48f1d0 OC |
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 | ||
| 34 | static 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 | */ | |
| 44 | int 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 | } | |
| 55 | ||
| 56 | /** | |
| 57 | * rt5677_spi_burst_write - Write data to SPI by rt5677 dsp memory address. | |
| 58 | * @addr: Start address. | |
| 59 | * @txbuf: Data Buffer for writng. | |
| 60 | * @len: Data length, it must be a multiple of 8. | |
| 61 | * | |
| 62 | * | |
| 63 | * Returns true for success. | |
| 64 | */ | |
| 65 | int rt5677_spi_burst_write(u32 addr, const struct firmware *fw) | |
| 66 | { | |
| 67 | u8 spi_cmd = RT5677_SPI_CMD_BURST_WRITE; | |
| 68 | u8 *write_buf; | |
| 69 | unsigned int i, end, offset = 0; | |
| 70 | ||
| 71 | write_buf = kmalloc(RT5677_SPI_BUF_LEN + 6, GFP_KERNEL); | |
| 72 | ||
| 73 | if (write_buf == NULL) | |
| 74 | return -ENOMEM; | |
| 75 | ||
| 76 | while (offset < fw->size) { | |
| 77 | if (offset + RT5677_SPI_BUF_LEN <= fw->size) | |
| 78 | end = RT5677_SPI_BUF_LEN; | |
| 79 | else | |
| 80 | end = fw->size % RT5677_SPI_BUF_LEN; | |
| 81 | ||
| 82 | write_buf[0] = spi_cmd; | |
| 83 | write_buf[1] = ((addr + offset) & 0xff000000) >> 24; | |
| 84 | write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16; | |
| 85 | write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8; | |
| 86 | write_buf[4] = ((addr + offset) & 0x000000ff) >> 0; | |
| 87 | ||
| 88 | for (i = 0; i < end; i += 8) { | |
| 89 | write_buf[i + 12] = fw->data[offset + i + 0]; | |
| 90 | write_buf[i + 11] = fw->data[offset + i + 1]; | |
| 91 | write_buf[i + 10] = fw->data[offset + i + 2]; | |
| 92 | write_buf[i + 9] = fw->data[offset + i + 3]; | |
| 93 | write_buf[i + 8] = fw->data[offset + i + 4]; | |
| 94 | write_buf[i + 7] = fw->data[offset + i + 5]; | |
| 95 | write_buf[i + 6] = fw->data[offset + i + 6]; | |
| 96 | write_buf[i + 5] = fw->data[offset + i + 7]; | |
| 97 | } | |
| 98 | ||
| 99 | write_buf[end + 5] = spi_cmd; | |
| 100 | ||
| 101 | rt5677_spi_write(write_buf, end + 6); | |
| 102 | ||
| 103 | offset += RT5677_SPI_BUF_LEN; | |
| 104 | } | |
| 105 | ||
| 106 | kfree(write_buf); | |
| 107 | ||
| 108 | return 0; | |
| 109 | } | |
| 110 | ||
| 111 | static int rt5677_spi_probe(struct spi_device *spi) | |
| 112 | { | |
| 113 | g_spi = spi; | |
| 114 | return 0; | |
| 115 | } | |
| 116 | ||
| 117 | static struct spi_driver rt5677_spi_driver = { | |
| 118 | .driver = { | |
| 119 | .name = "rt5677", | |
| 120 | .owner = THIS_MODULE, | |
| 121 | }, | |
| 122 | .probe = rt5677_spi_probe, | |
| 123 | }; | |
| 124 | module_spi_driver(rt5677_spi_driver); | |
| 125 | ||
| 126 | MODULE_DESCRIPTION("ASoC RT5677 SPI driver"); | |
| 127 | MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>"); | |
| 128 | MODULE_LICENSE("GPL v2"); |