Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 333 insertions, 0 deletions

diff --git a/sound/i2c/i2c.c b/sound/i2c/i2c.c
new file mode 100644
index 000000000000..e8fa7e1a68e8
--- /dev/null
+++ b/sound/i2c/i2c.c
@@ -0,0 +1,333 @@
+/*
+ *   Generic i2c interface for ALSA
+ *
+ *   (c) 1998 Gerd Knorr <kraxel@cs.tu-berlin.de>
+ *   Modified for the ALSA driver by Jaroslav Kysela <perex@suse.cz>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   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.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+#include <sound/driver.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <sound/core.h>
+#include <sound/i2c.h>
+
+MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
+MODULE_DESCRIPTION("Generic i2c interface for ALSA");
+MODULE_LICENSE("GPL");
+
+static int snd_i2c_bit_sendbytes(snd_i2c_device_t *device, unsigned char *bytes, int count);
+static int snd_i2c_bit_readbytes(snd_i2c_device_t *device, unsigned char *bytes, int count);
+static int snd_i2c_bit_probeaddr(snd_i2c_bus_t *bus, unsigned short addr);
+
+static snd_i2c_ops_t snd_i2c_bit_ops = {
+        .sendbytes = snd_i2c_bit_sendbytes,
+        .readbytes = snd_i2c_bit_readbytes,
+        .probeaddr = snd_i2c_bit_probeaddr,
+};
+
+static int snd_i2c_bus_free(snd_i2c_bus_t *bus)
+{
+        snd_i2c_bus_t *slave;
+        snd_i2c_device_t *device;
+
+        snd_assert(bus != NULL, return -EINVAL);
+        while (!list_empty(&bus->devices)) {
+                device = snd_i2c_device(bus->devices.next);
+                snd_i2c_device_free(device);
+        }
+        if (bus->master)
+                list_del(&bus->buses);
+        else {
+                while (!list_empty(&bus->buses)) {
+                        slave = snd_i2c_slave_bus(bus->buses.next);
+                        snd_device_free(bus->card, slave);
+                }
+        }
+        if (bus->private_free)
+                bus->private_free(bus);
+        kfree(bus);
+        return 0;
+}
+
+static int snd_i2c_bus_dev_free(snd_device_t *device)
+{
+        snd_i2c_bus_t *bus = device->device_data;
+        return snd_i2c_bus_free(bus);
+}
+
+int snd_i2c_bus_create(snd_card_t *card, const char *name, snd_i2c_bus_t *master, snd_i2c_bus_t **ri2c)
+{
+        snd_i2c_bus_t *bus;
+        int err;
+        static snd_device_ops_t ops = {
+                .dev_free =     snd_i2c_bus_dev_free,
+        };
+
+        *ri2c = NULL;
+        bus = kcalloc(1, sizeof(*bus), GFP_KERNEL);
+        if (bus == NULL)
+                return -ENOMEM;
+        init_MUTEX(&bus->lock_mutex);
+        INIT_LIST_HEAD(&bus->devices);
+        INIT_LIST_HEAD(&bus->buses);
+        bus->card = card;
+        bus->ops = &snd_i2c_bit_ops;
+        if (master) {
+                list_add_tail(&bus->buses, &master->buses);
+                bus->master = master;
+        }
+        strlcpy(bus->name, name, sizeof(bus->name));
+        if ((err = snd_device_new(card, SNDRV_DEV_BUS, bus, &ops)) < 0) {
+                snd_i2c_bus_free(bus);
+                return err;
+        }
+        *ri2c = bus;
+        return 0;
+}
+
+int snd_i2c_device_create(snd_i2c_bus_t *bus, const char *name, unsigned char addr, snd_i2c_device_t **rdevice)
+{
+        snd_i2c_device_t *device;
+
+        *rdevice = NULL;
+        snd_assert(bus != NULL, return -EINVAL);
+        device = kcalloc(1, sizeof(*device), GFP_KERNEL);
+        if (device == NULL)
+                return -ENOMEM;
+        device->addr = addr;
+        strlcpy(device->name, name, sizeof(device->name));
+        list_add_tail(&device->list, &bus->devices);
+        device->bus = bus;
+        *rdevice = device;
+        return 0;
+}
+
+int snd_i2c_device_free(snd_i2c_device_t *device)
+{
+        if (device->bus)
+                list_del(&device->list);
+        if (device->private_free)
+                device->private_free(device);
+        kfree(device);
+        return 0;
+}
+
+int snd_i2c_sendbytes(snd_i2c_device_t *device, unsigned char *bytes, int count)
+{
+        return device->bus->ops->sendbytes(device, bytes, count);
+}
+
+
+int snd_i2c_readbytes(snd_i2c_device_t *device, unsigned char *bytes, int count)
+{
+        return device->bus->ops->readbytes(device, bytes, count);
+}
+
+int snd_i2c_probeaddr(snd_i2c_bus_t *bus, unsigned short addr)
+{
+        return bus->ops->probeaddr(bus, addr);
+}
+
+/*
+ *  bit-operations
+ */
+
+static inline void snd_i2c_bit_hw_start(snd_i2c_bus_t *bus)
+{
+        if (bus->hw_ops.bit->start)
+                bus->hw_ops.bit->start(bus);
+}
+
+static inline void snd_i2c_bit_hw_stop(snd_i2c_bus_t *bus)
+{
+        if (bus->hw_ops.bit->stop)
+                bus->hw_ops.bit->stop(bus);
+}
+
+static void snd_i2c_bit_direction(snd_i2c_bus_t *bus, int clock, int data)
+{
+        if (bus->hw_ops.bit->direction)
+                bus->hw_ops.bit->direction(bus, clock, data);
+}
+
+static void snd_i2c_bit_set(snd_i2c_bus_t *bus, int clock, int data)
+{
+        bus->hw_ops.bit->setlines(bus, clock, data);
+}
+
+#if 0
+static int snd_i2c_bit_clock(snd_i2c_bus_t *bus)
+{
+        if (bus->hw_ops.bit->getclock)
+                return bus->hw_ops.bit->getclock(bus);
+        return -ENXIO;
+}
+#endif
+
+static int snd_i2c_bit_data(snd_i2c_bus_t *bus, int ack)
+{
+        return bus->hw_ops.bit->getdata(bus, ack);
+}
+
+static void snd_i2c_bit_start(snd_i2c_bus_t *bus)
+{
+        snd_i2c_bit_hw_start(bus);
+        snd_i2c_bit_direction(bus, 1, 1);       /* SCL - wr, SDA - wr */
+        snd_i2c_bit_set(bus, 1, 1);
+        snd_i2c_bit_set(bus, 1, 0);
+        snd_i2c_bit_set(bus, 0, 0);
+}
+
+static void snd_i2c_bit_stop(snd_i2c_bus_t *bus)
+{
+        snd_i2c_bit_set(bus, 0, 0);
+        snd_i2c_bit_set(bus, 1, 0);
+        snd_i2c_bit_set(bus, 1, 1);
+        snd_i2c_bit_hw_stop(bus);
+}
+
+static void snd_i2c_bit_send(snd_i2c_bus_t *bus, int data)
+{
+        snd_i2c_bit_set(bus, 0, data);
+        snd_i2c_bit_set(bus, 1, data);
+        snd_i2c_bit_set(bus, 0, data);
+}
+
+static int snd_i2c_bit_ack(snd_i2c_bus_t *bus)
+{
+        int ack;
+
+        snd_i2c_bit_set(bus, 0, 1);
+        snd_i2c_bit_set(bus, 1, 1);
+        snd_i2c_bit_direction(bus, 1, 0);       /* SCL - wr, SDA - rd */
+        ack = snd_i2c_bit_data(bus, 1);
+        snd_i2c_bit_direction(bus, 1, 1);       /* SCL - wr, SDA - wr */
+        snd_i2c_bit_set(bus, 0, 1);
+        return ack ? -EIO : 0;
+}
+
+static int snd_i2c_bit_sendbyte(snd_i2c_bus_t *bus, unsigned char data)
+{
+        int i, err;
+
+        for (i = 7; i >= 0; i--)
+                snd_i2c_bit_send(bus, !!(data & (1 << i)));
+        if ((err = snd_i2c_bit_ack(bus)) < 0)
+                return err;
+        return 0;
+}
+
+static int snd_i2c_bit_readbyte(snd_i2c_bus_t *bus, int last)
+{
+        int i;
+        unsigned char data = 0;
+
+        snd_i2c_bit_set(bus, 0, 1);
+        snd_i2c_bit_direction(bus, 1, 0);       /* SCL - wr, SDA - rd */
+        for (i = 7; i >= 0; i--) {
+                snd_i2c_bit_set(bus, 1, 1);
+                if (snd_i2c_bit_data(bus, 0))
+                        data |= (1 << i);
+                snd_i2c_bit_set(bus, 0, 1);
+        }
+        snd_i2c_bit_direction(bus, 1, 1);       /* SCL - wr, SDA - wr */
+        snd_i2c_bit_send(bus, !!last);
+        return data;
+}
+
+static int snd_i2c_bit_sendbytes(snd_i2c_device_t *device, unsigned char *bytes, int count)
+{
+        snd_i2c_bus_t *bus = device->bus;
+        int err, res = 0;
+
+        if (device->flags & SND_I2C_DEVICE_ADDRTEN)
+                return -EIO;            /* not yet implemented */
+        snd_i2c_bit_start(bus);
+        if ((err = snd_i2c_bit_sendbyte(bus, device->addr << 1)) < 0) {
+                snd_i2c_bit_hw_stop(bus);
+                return err;
+        }
+        while (count-- > 0) {
+                if ((err = snd_i2c_bit_sendbyte(bus, *bytes++)) < 0) {
+                        snd_i2c_bit_hw_stop(bus);
+                        return err;
+                }
+                res++;
+        }
+        snd_i2c_bit_stop(bus);
+        return res;
+}
+
+static int snd_i2c_bit_readbytes(snd_i2c_device_t *device, unsigned char *bytes, int count)
+{
+        snd_i2c_bus_t *bus = device->bus;
+        int err, res = 0;
+
+        if (device->flags & SND_I2C_DEVICE_ADDRTEN)
+                return -EIO;            /* not yet implemented */
+        snd_i2c_bit_start(bus);
+        if ((err = snd_i2c_bit_sendbyte(bus, (device->addr << 1) | 1)) < 0) {
+                snd_i2c_bit_hw_stop(bus);
+                return err;
+        }
+        while (count-- > 0) {
+                if ((err = snd_i2c_bit_readbyte(bus, count == 0)) < 0) {
+                        snd_i2c_bit_hw_stop(bus);
+                        return err;
+                }
+                *bytes++ = (unsigned char)err;
+                res++;
+        }
+        snd_i2c_bit_stop(bus);
+        return res;
+}
+
+static int snd_i2c_bit_probeaddr(snd_i2c_bus_t *bus, unsigned short addr)
+{
+        int err;
+
+        if (addr & 0x8000)      /* 10-bit address */
+                return -EIO;    /* not yet implemented */
+        if (addr & 0x7f80)      /* invalid address */
+                return -EINVAL;
+        snd_i2c_bit_start(bus);
+        err = snd_i2c_bit_sendbyte(bus, addr << 1);
+        snd_i2c_bit_stop(bus);
+        return err;
+}
+
+EXPORT_SYMBOL(snd_i2c_bus_create);
+EXPORT_SYMBOL(snd_i2c_device_create);
+EXPORT_SYMBOL(snd_i2c_device_free);
+EXPORT_SYMBOL(snd_i2c_sendbytes);
+EXPORT_SYMBOL(snd_i2c_readbytes);
+EXPORT_SYMBOL(snd_i2c_probeaddr);
+
+static int __init alsa_i2c_init(void)
+{
+        return 0;
+}
+
+static void __exit alsa_i2c_exit(void)
+{
+}
+
+module_init(alsa_i2c_init)
+module_exit(alsa_i2c_exit)