diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/staging/Makefile | 1 | ||||
| -rw-r--r-- | drivers/staging/goldfish/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/staging/goldfish/Makefile | 5 | ||||
| -rw-r--r-- | drivers/staging/goldfish/README | 2 | ||||
| -rw-r--r-- | drivers/staging/goldfish/goldfish_audio.c | 363 |
6 files changed, 379 insertions, 0 deletions
diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig index 0b47a06c104a..3a7965d6ac28 100644 --- a/drivers/staging/Kconfig +++ b/drivers/staging/Kconfig @@ -140,4 +140,6 @@ source "drivers/staging/fwserial/Kconfig" source "drivers/staging/zcache/Kconfig" +source "drivers/staging/goldfish/Kconfig" + endif # STAGING diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile index b026ea37bcaf..5971865d0c61 100644 --- a/drivers/staging/Makefile +++ b/drivers/staging/Makefile @@ -62,3 +62,4 @@ obj-$(CONFIG_DGRP) += dgrp/ obj-$(CONFIG_SB105X) += sb105x/ obj-$(CONFIG_FIREWIRE_SERIAL) += fwserial/ obj-$(CONFIG_ZCACHE) += zcache/ +obj-$(CONFIG_GOLDFISH) += goldfish/ diff --git a/drivers/staging/goldfish/Kconfig b/drivers/staging/goldfish/Kconfig new file mode 100644 index 000000000000..1a3e5768faa9 --- /dev/null +++ b/drivers/staging/goldfish/Kconfig @@ -0,0 +1,6 @@ +config GOLDFISH_AUDIO + tristate "Goldfish AVD Audio Device" + depends on GOLDFISH + ---help--- + Emulated audio channel for the Goldfish Android Virtual Device + diff --git a/drivers/staging/goldfish/Makefile b/drivers/staging/goldfish/Makefile new file mode 100644 index 000000000000..054eeb82151e --- /dev/null +++ b/drivers/staging/goldfish/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for the Goldfish audio driver +# + +obj-$(CONFIG_GOLDFISH_AUDIO) += goldfish_audio.o diff --git a/drivers/staging/goldfish/README b/drivers/staging/goldfish/README new file mode 100644 index 000000000000..afa69bdf8d03 --- /dev/null +++ b/drivers/staging/goldfish/README @@ -0,0 +1,2 @@ +- Move to using the ALSA framework not faking it +- Fix the wrong user page DMA (moving to ALSA may fix that too) diff --git a/drivers/staging/goldfish/goldfish_audio.c b/drivers/staging/goldfish/goldfish_audio.c new file mode 100644 index 000000000000..d3bed21f4072 --- /dev/null +++ b/drivers/staging/goldfish/goldfish_audio.c @@ -0,0 +1,363 @@ +/* drivers/misc/goldfish_audio.c + * + * Copyright (C) 2007 Google, Inc. + * Copyright (C) 2012 Intel, Inc. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/module.h> +#include <linux/miscdevice.h> +#include <linux/fs.h> +#include <linux/platform_device.h> +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/sched.h> +#include <linux/dma-mapping.h> +#include <linux/uaccess.h> + +MODULE_AUTHOR("Google, Inc."); +MODULE_DESCRIPTION("Android QEMU Audio Driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION("1.0"); + +struct goldfish_audio { + char __iomem *reg_base; + int irq; + spinlock_t lock; + wait_queue_head_t wait; + + char __iomem *buffer_virt; /* combined buffer virtual address */ + unsigned long buffer_phys; /* combined buffer physical address */ + + char __iomem *write_buffer1; /* write buffer 1 virtual address */ + char __iomem *write_buffer2; /* write buffer 2 virtual address */ + char __iomem *read_buffer; /* read buffer virtual address */ + int buffer_status; + int read_supported; /* true if we have audio input support */ +}; + +/* We will allocate two read buffers and two write buffers. + Having two read buffers facilitate stereo -> mono conversion. + Having two write buffers facilitate interleaved IO. +*/ +#define READ_BUFFER_SIZE 16384 +#define WRITE_BUFFER_SIZE 16384 +#define COMBINED_BUFFER_SIZE ((2 * READ_BUFFER_SIZE) + \ + (2 * WRITE_BUFFER_SIZE)) + +#define AUDIO_READ(data, addr) (readl(data->reg_base + addr)) +#define AUDIO_WRITE(data, addr, x) (writel(x, data->reg_base + addr)) + +/* temporary variable used between goldfish_audio_probe() and + goldfish_audio_open() */ +static struct goldfish_audio *audio_data; + +enum { + /* audio status register */ + AUDIO_INT_STATUS = 0x00, + /* set this to enable IRQ */ + AUDIO_INT_ENABLE = 0x04, + /* set these to specify buffer addresses */ + AUDIO_SET_WRITE_BUFFER_1 = 0x08, + AUDIO_SET_WRITE_BUFFER_2 = 0x0C, + /* set number of bytes in buffer to write */ + AUDIO_WRITE_BUFFER_1 = 0x10, + AUDIO_WRITE_BUFFER_2 = 0x14, + + /* true if audio input is supported */ + AUDIO_READ_SUPPORTED = 0x18, + /* buffer to use for audio input */ + AUDIO_SET_READ_BUFFER = 0x1C, + + /* driver writes number of bytes to read */ + AUDIO_START_READ = 0x20, + + /* number of bytes available in read buffer */ + AUDIO_READ_BUFFER_AVAILABLE = 0x24, + + /* AUDIO_INT_STATUS bits */ + + /* this bit set when it is safe to write more bytes to the buffer */ + AUDIO_INT_WRITE_BUFFER_1_EMPTY = 1U << 0, + AUDIO_INT_WRITE_BUFFER_2_EMPTY = 1U << 1, + AUDIO_INT_READ_BUFFER_FULL = 1U << 2, + + AUDIO_INT_MASK = AUDIO_INT_WRITE_BUFFER_1_EMPTY | + AUDIO_INT_WRITE_BUFFER_2_EMPTY | + AUDIO_INT_READ_BUFFER_FULL, +}; + + +static atomic_t open_count = ATOMIC_INIT(0); + + +static ssize_t goldfish_audio_read(struct file *fp, char __user *buf, + size_t count, loff_t *pos) +{ + struct goldfish_audio *data = fp->private_data; + int length; + int result = 0; + + if (!data->read_supported) + return -ENODEV; + + while (count > 0) { + length = (count > READ_BUFFER_SIZE ? READ_BUFFER_SIZE : count); + AUDIO_WRITE(data, AUDIO_START_READ, length); + + wait_event_interruptible(data->wait, + (data->buffer_status & AUDIO_INT_READ_BUFFER_FULL)); + + length = AUDIO_READ(data, + AUDIO_READ_BUFFER_AVAILABLE); + + /* copy data to user space */ + if (copy_to_user(buf, data->read_buffer, length)) + return -EFAULT; + + result += length; + buf += length; + count -= length; + } + return result; +} + +static ssize_t goldfish_audio_write(struct file *fp, const char __user *buf, + size_t count, loff_t *pos) +{ + struct goldfish_audio *data = fp->private_data; + unsigned long irq_flags; + ssize_t result = 0; + char __iomem *kbuf; + + while (count > 0) { + ssize_t copy = count; + if (copy > WRITE_BUFFER_SIZE) + copy = WRITE_BUFFER_SIZE; + wait_event_interruptible(data->wait, (data->buffer_status & + (AUDIO_INT_WRITE_BUFFER_1_EMPTY | + AUDIO_INT_WRITE_BUFFER_2_EMPTY))); + + if ((data->buffer_status & AUDIO_INT_WRITE_BUFFER_1_EMPTY) != 0) + kbuf = data->write_buffer1; + else + kbuf = data->write_buffer2; + + /* copy from user space to the appropriate buffer */ + if (copy_from_user(kbuf, buf, copy)) { + result = -EFAULT; + break; + } + + spin_lock_irqsave(&data->lock, irq_flags); + /* clear the buffer empty flag, and signal the emulator + * to start writing the buffer */ + if (kbuf == data->write_buffer1) { + data->buffer_status &= ~AUDIO_INT_WRITE_BUFFER_1_EMPTY; + AUDIO_WRITE(data, AUDIO_WRITE_BUFFER_1, copy); + } else { + data->buffer_status &= ~AUDIO_INT_WRITE_BUFFER_2_EMPTY; + AUDIO_WRITE(data, AUDIO_WRITE_BUFFER_2, copy); + } + spin_unlock_irqrestore(&data->lock, irq_flags); + + buf += copy; + result += copy; + count -= copy; + } + return result; +} + +static int goldfish_audio_open(struct inode *ip, struct file *fp) +{ + if (!audio_data) + return -ENODEV; + + if (atomic_inc_return(&open_count) == 1) { + fp->private_data = audio_data; + audio_data->buffer_status = (AUDIO_INT_WRITE_BUFFER_1_EMPTY | + AUDIO_INT_WRITE_BUFFER_2_EMPTY); + AUDIO_WRITE(audio_data, AUDIO_INT_ENABLE, AUDIO_INT_MASK); + return 0; + } else { + atomic_dec(&open_count); + return -EBUSY; + } +} + +static int goldfish_audio_release(struct inode *ip, struct file *fp) +{ + atomic_dec(&open_count); + /* FIXME: surely this is wrong for the multi-opened case */ + AUDIO_WRITE(audio_data, AUDIO_INT_ENABLE, 0); + return 0; +} + +static long goldfish_audio_ioctl(struct file *fp, unsigned int cmd, + unsigned long arg) +{ + /* temporary workaround, until we switch to the ALSA API */ + if (cmd == 315) + return -1; + else + return 0; +} + +static irqreturn_t goldfish_audio_interrupt(int irq, void *dev_id) +{ + unsigned long irq_flags; + struct goldfish_audio *data = dev_id; + u32 status; + + spin_lock_irqsave(&data->lock, irq_flags); + + /* read buffer status flags */ + status = AUDIO_READ(data, AUDIO_INT_STATUS); + status &= AUDIO_INT_MASK; + /* if buffers are newly empty, wake up blocked + goldfish_audio_write() call */ + if (status) { + data->buffer_status = status; + wake_up(&data->wait); + } + + spin_unlock_irqrestore(&data->lock, irq_flags); + return status ? IRQ_HANDLED : IRQ_NONE; +} + +/* file operations for /dev/eac */ +static const struct file_operations goldfish_audio_fops = { + .owner = THIS_MODULE, + .read = goldfish_audio_read, + .write = goldfish_audio_write, + .open = goldfish_audio_open, + .release = goldfish_audio_release, + .unlocked_ioctl = goldfish_audio_ioctl, +}; + +static struct miscdevice goldfish_audio_device = { + .minor = MISC_DYNAMIC_MINOR, + .name = "eac", + .fops = &goldfish_audio_fops, +}; + +static int goldfish_audio_probe(struct platform_device *pdev) +{ + int ret; + struct resource *r; + struct goldfish_audio *data; + dma_addr_t buf_addr; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (data == NULL) { + ret = -ENOMEM; + goto err_data_alloc_failed; + } + spin_lock_init(&data->lock); + init_waitqueue_head(&data->wait); + platform_set_drvdata(pdev, data); + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (r == NULL) { + dev_err(&pdev->dev, "platform_get_resource failed\n"); + ret = -ENODEV; + goto err_no_io_base; + } + data->reg_base = ioremap(r->start, PAGE_SIZE); + if (data->reg_base == NULL) { + ret = -ENOMEM; + goto err_no_io_base; + } + + data->irq = platform_get_irq(pdev, 0); + if (data->irq < 0) { + dev_err(&pdev->dev, "platform_get_irq failed\n"); + ret = -ENODEV; + goto err_no_irq; + } + data->buffer_virt = dma_alloc_coherent(&pdev->dev, + COMBINED_BUFFER_SIZE, &buf_addr, GFP_KERNEL); + if (data->buffer_virt == 0) { + ret = -ENOMEM; + dev_err(&pdev->dev, "allocate buffer failed\n"); + goto err_alloc_write_buffer_failed; + } + data->buffer_phys = buf_addr; + data->write_buffer1 = data->buffer_virt; + data->write_buffer2 = data->buffer_virt + WRITE_BUFFER_SIZE; + data->read_buffer = data->buffer_virt + 2 * WRITE_BUFFER_SIZE; + + ret = request_irq(data->irq, goldfish_audio_interrupt, + IRQF_SHARED, pdev->name, data); + if (ret) { + dev_err(&pdev->dev, "request_irq failed\n"); + goto err_request_irq_failed; + } + + ret = misc_register(&goldfish_audio_device); + if (ret) { + dev_err(&pdev->dev, + "misc_register returned %d in goldfish_audio_init\n", + ret); + goto err_misc_register_failed; + } + + AUDIO_WRITE(data, AUDIO_SET_WRITE_BUFFER_1, buf_addr); + AUDIO_WRITE(data, AUDIO_SET_WRITE_BUFFER_2, + buf_addr + WRITE_BUFFER_SIZE); + + data->read_supported = AUDIO_READ(data, AUDIO_READ_SUPPORTED); + if (data->read_supported) + AUDIO_WRITE(data, AUDIO_SET_READ_BUFFER, + buf_addr + 2 * WRITE_BUFFER_SIZE); + + audio_data = data; + return 0; + +err_misc_register_failed: +err_request_irq_failed: + dma_free_coherent(&pdev->dev, COMBINED_BUFFER_SIZE, + data->buffer_virt, data->buffer_phys); +err_alloc_write_buffer_failed: +err_no_irq: + iounmap(data->reg_base); +err_no_io_base: + kfree(data); +err_data_alloc_failed: + return ret; +} + +static int goldfish_audio_remove(struct platform_device *pdev) +{ + struct goldfish_audio *data = platform_get_drvdata(pdev); + + misc_deregister(&goldfish_audio_device); + free_irq(data->irq, data); + dma_free_coherent(&pdev->dev, COMBINED_BUFFER_SIZE, + data->buffer_virt, data->buffer_phys); + iounmap(data->reg_base); + kfree(data); + audio_data = NULL; + return 0; +} + +static struct platform_driver goldfish_audio_driver = { + .probe = goldfish_audio_probe, + .remove = goldfish_audio_remove, + .driver = { + .name = "goldfish_audio" + } +}; + +module_platform_driver(goldfish_audio_driver); |