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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /sound/oss/ac97.c
Linux-2.6.12-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!
Diffstat (limited to 'sound/oss/ac97.c')
-rw-r--r--sound/oss/ac97.c452
1 files changed, 452 insertions, 0 deletions
diff --git a/sound/oss/ac97.c b/sound/oss/ac97.c
new file mode 100644
index 00000000000..3ba6d91e891
--- /dev/null
+++ b/sound/oss/ac97.c
@@ -0,0 +1,452 @@
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include "ac97.h"
+
+/* Flag for mono controls. */
+#define MO 0
+/* And for stereo. */
+#define ST 1
+
+/* Whether or not the bits in the channel are inverted. */
+#define INV 1
+#define NINV 0
+
+static struct ac97_chn_desc {
+ int ac97_regnum;
+ int oss_channel;
+ int maxval;
+ int is_stereo;
+ int oss_mask;
+ int recordNum;
+ u16 regmask;
+ int is_inverted;
+} mixerRegs[] = {
+ { AC97_MASTER_VOL_STEREO, SOUND_MIXER_VOLUME, 0x3f, ST, SOUND_MASK_VOLUME, 5, 0x0000, INV },
+ { AC97_MASTER_VOL_MONO, SOUND_MIXER_PHONEOUT, 0x3f, MO, SOUND_MASK_PHONEOUT, 6, 0x0000, INV },
+ { AC97_MASTER_TONE, SOUND_MIXER_TREBLE, 0x0f, MO, SOUND_MASK_TREBLE, -1, 0x00ff, INV },
+ { AC97_MASTER_TONE, SOUND_MIXER_BASS, 0x0f, MO, SOUND_MASK_BASS, -1, 0xff00, INV },
+ { AC97_PCBEEP_VOL, SOUND_MIXER_SPEAKER, 0x0f, MO, SOUND_MASK_SPEAKER, -1, 0x001e, INV },
+ { AC97_PHONE_VOL, SOUND_MIXER_PHONEIN, 0x1f, MO, SOUND_MASK_PHONEIN, 7, 0x0000, INV },
+ { AC97_MIC_VOL, SOUND_MIXER_MIC, 0x1f, MO, SOUND_MASK_MIC, 0, 0x0000, INV },
+ { AC97_LINEIN_VOL, SOUND_MIXER_LINE, 0x1f, ST, SOUND_MASK_LINE, 4, 0x0000, INV },
+ { AC97_CD_VOL, SOUND_MIXER_CD, 0x1f, ST, SOUND_MASK_CD, 1, 0x0000, INV },
+ { AC97_VIDEO_VOL, SOUND_MIXER_VIDEO, 0x1f, ST, SOUND_MASK_VIDEO, 2, 0x0000, INV },
+ { AC97_AUX_VOL, SOUND_MIXER_LINE1, 0x1f, ST, SOUND_MASK_LINE1, 3, 0x0000, INV },
+ { AC97_PCMOUT_VOL, SOUND_MIXER_PCM, 0x1f, ST, SOUND_MASK_PCM, -1, 0x0000, INV },
+ { AC97_RECORD_GAIN, SOUND_MIXER_IGAIN, 0x0f, ST, SOUND_MASK_IGAIN, -1, 0x0000, NINV },
+ { -1, -1, 0xff, 0, 0, -1, 0x0000, 0 },
+};
+
+static struct ac97_chn_desc *
+ac97_find_chndesc (struct ac97_hwint *dev, int oss_channel)
+{
+ int x;
+
+ for (x = 0; mixerRegs[x].oss_channel != -1; x++) {
+ if (mixerRegs[x].oss_channel == oss_channel)
+ return mixerRegs + x;
+ }
+
+ return NULL;
+}
+
+static inline int
+ac97_is_valid_channel (struct ac97_hwint *dev, struct ac97_chn_desc *chn)
+{
+ return (dev->last_written_mixer_values[chn->ac97_regnum / 2]
+ != AC97_REG_UNSUPPORTED);
+}
+
+int
+ac97_init (struct ac97_hwint *dev)
+{
+ int x;
+ int reg0;
+
+ /* Clear out the arrays of cached values. */
+ for (x = 0; x < AC97_REG_CNT; x++)
+ dev->last_written_mixer_values[x] = AC97_REGVAL_UNKNOWN;
+
+ for (x = 0; x < SOUND_MIXER_NRDEVICES; x++)
+ dev->last_written_OSS_values[x] = AC97_REGVAL_UNKNOWN;
+
+ /* Clear the device masks. */
+ dev->mixer_devmask = 0;
+ dev->mixer_stereomask = 0;
+ dev->mixer_recmask = 0;
+
+ /* ??? Do a "standard reset" via register 0? */
+
+ /* Hardware-dependent reset. */
+ if (dev->reset_device (dev))
+ return -1;
+
+ /* Check the mixer device capabilities. */
+ reg0 = dev->read_reg (dev, AC97_RESET);
+
+ if (reg0 < 0)
+ return -1;
+
+ /* Check for support for treble/bass controls. */
+ if (! (reg0 & 4)) {
+ dev->last_written_mixer_values[AC97_MASTER_TONE / 2]
+ = AC97_REG_UNSUPPORTED;
+ }
+
+ /* ??? There may be other tests here? */
+
+ /* Fill in the device masks. */
+ for (x = 0; mixerRegs[x].ac97_regnum != -1; x++) {
+ if (ac97_is_valid_channel (dev, mixerRegs + x)) {
+ dev->mixer_devmask |= mixerRegs[x].oss_mask;
+
+ if (mixerRegs[x].is_stereo)
+ dev->mixer_stereomask |= mixerRegs[x].oss_mask;
+
+ if (mixerRegs[x].recordNum != -1)
+ dev->mixer_recmask |= mixerRegs[x].oss_mask;
+ }
+ }
+
+ return 0;
+}
+
+/* Reset the mixer to the currently saved settings. */
+int
+ac97_reset (struct ac97_hwint *dev)
+{
+ int x;
+
+ if (dev->reset_device (dev))
+ return -1;
+
+ /* Now set the registers back to their last-written values. */
+ for (x = 0; mixerRegs[x].ac97_regnum != -1; x++) {
+ int regnum = mixerRegs[x].ac97_regnum;
+ int value = dev->last_written_mixer_values [regnum / 2];
+ if (value >= 0)
+ ac97_put_register (dev, regnum, value);
+ }
+ return 0;
+}
+
+/* Return the contents of register REG; use the cache if the value in it
+ is valid. Returns a negative error code on failure. */
+static int
+ac97_get_register (struct ac97_hwint *dev, u8 reg)
+{
+ if (reg > 127 || (reg & 1))
+ return -EINVAL;
+
+ /* See if it's in the cache, or if it's just plain invalid. */
+ switch (dev->last_written_mixer_values[reg / 2]) {
+ case AC97_REG_UNSUPPORTED:
+ return -EINVAL;
+ break;
+ case AC97_REGVAL_UNKNOWN:
+ dev->last_written_mixer_values[reg / 2] = dev->read_reg (dev, reg);
+ break;
+ default:
+ break;
+ }
+ return dev->last_written_mixer_values[reg / 2];
+}
+
+/* Write VALUE to AC97 register REG, and cache its value in the last-written
+ cache. Returns a negative error code on failure, or 0 on success. */
+int
+ac97_put_register (struct ac97_hwint *dev, u8 reg, u16 value)
+{
+ if (reg > 127 || (reg & 1))
+ return -EINVAL;
+
+ if (dev->last_written_mixer_values[reg / 2] == AC97_REG_UNSUPPORTED)
+ return -EINVAL;
+ else {
+ int res = dev->write_reg (dev, reg, value);
+ if (res >= 0) {
+ dev->last_written_mixer_values[reg / 2] = value;
+ return 0;
+ }
+ else
+ return res;
+ }
+}
+
+/* Scale VALUE (a value fro 0 to MAXVAL) to a value from 0-100. If
+ IS_STEREO is set, VALUE is a stereo value; the left channel value
+ is in the lower 8 bits, and the right channel value is in the upper
+ 8 bits.
+
+ A negative error code is returned on failure, or the unsigned
+ scaled value on success. */
+
+static int
+ac97_scale_to_oss_val (int value, int maxval, int is_stereo, int inv)
+{
+ /* Muted? */
+ if (value & AC97_MUTE)
+ return 0;
+
+ if (is_stereo)
+ return (ac97_scale_to_oss_val (value & 255, maxval, 0, inv) << 8)
+ | (ac97_scale_to_oss_val ((value >> 8) & 255, maxval, 0, inv) << 0);
+ else {
+ int i;
+
+ /* Inverted. */
+ if (inv)
+ value = maxval - value;
+
+ i = (value * 100 + (maxval / 2)) / maxval;
+ if (i > 100)
+ i = 100;
+ if (i < 0)
+ i = 0;
+ return i;
+ }
+}
+
+static int
+ac97_scale_from_oss_val (int value, int maxval, int is_stereo, int inv)
+{
+ if (is_stereo)
+ return (ac97_scale_from_oss_val (value & 255, maxval, 0, inv) << 8)
+ | (ac97_scale_from_oss_val ((value >> 8) & 255, maxval, 0, inv) << 0);
+ else {
+ int i = ((value & 255) * maxval + 50) / 100;
+ if (inv)
+ i = maxval - i;
+ if (i < 0)
+ i = 0;
+ if (i > maxval)
+ i = maxval;
+ return i;
+ }
+}
+
+static int
+ac97_set_mixer (struct ac97_hwint *dev, int oss_channel, u16 oss_value)
+{
+ int scaled_value;
+ struct ac97_chn_desc *channel = ac97_find_chndesc (dev, oss_channel);
+ int result;
+
+ if (channel == NULL)
+ return -ENODEV;
+ if (! ac97_is_valid_channel (dev, channel))
+ return -ENODEV;
+ scaled_value = ac97_scale_from_oss_val (oss_value, channel->maxval,
+ channel->is_stereo,
+ channel->is_inverted);
+ if (scaled_value < 0)
+ return scaled_value;
+
+ if (channel->regmask != 0) {
+ int mv;
+
+ int oldval = ac97_get_register (dev, channel->ac97_regnum);
+ if (oldval < 0)
+ return oldval;
+
+ for (mv = channel->regmask; ! (mv & 1); mv >>= 1)
+ scaled_value <<= 1;
+
+ scaled_value &= channel->regmask;
+ scaled_value |= (oldval & ~channel->regmask);
+ }
+ result = ac97_put_register (dev, channel->ac97_regnum, scaled_value);
+ if (result == 0)
+ dev->last_written_OSS_values[oss_channel] = oss_value;
+ return result;
+}
+
+static int
+ac97_get_mixer_scaled (struct ac97_hwint *dev, int oss_channel)
+{
+ struct ac97_chn_desc *channel = ac97_find_chndesc (dev, oss_channel);
+ int regval;
+
+ if (channel == NULL)
+ return -ENODEV;
+
+ if (! ac97_is_valid_channel (dev, channel))
+ return -ENODEV;
+
+ regval = ac97_get_register (dev, channel->ac97_regnum);
+
+ if (regval < 0)
+ return regval;
+
+ if (channel->regmask != 0) {
+ int mv;
+
+ regval &= channel->regmask;
+
+ for (mv = channel->regmask; ! (mv & 1); mv >>= 1)
+ regval >>= 1;
+ }
+ return ac97_scale_to_oss_val (regval, channel->maxval,
+ channel->is_stereo,
+ channel->is_inverted);
+}
+
+static int
+ac97_get_recmask (struct ac97_hwint *dev)
+{
+ int recReg = ac97_get_register (dev, AC97_RECORD_SELECT);
+
+ if (recReg < 0)
+ return recReg;
+ else {
+ int x;
+ for (x = 0; mixerRegs[x].ac97_regnum >= 0; x++) {
+ if (mixerRegs[x].recordNum == (recReg & 7))
+ return mixerRegs[x].oss_mask;
+ }
+ return -ENODEV;
+ }
+}
+
+static int
+ac97_set_recmask (struct ac97_hwint *dev, int oss_recmask)
+{
+ int x;
+
+ if (oss_recmask == 0)
+ oss_recmask = SOUND_MIXER_MIC;
+
+ for (x = 0; mixerRegs[x].ac97_regnum >= 0; x++) {
+ if ((mixerRegs[x].recordNum >= 0)
+ && (oss_recmask & mixerRegs[x].oss_mask))
+ break;
+ }
+ if (mixerRegs[x].ac97_regnum < 0)
+ return -ENODEV;
+ else {
+ int regval = (mixerRegs[x].recordNum << 8) | mixerRegs[x].recordNum;
+ int res = ac97_put_register (dev, AC97_RECORD_SELECT, regval);
+ if (res == 0)
+ return ac97_get_recmask (dev);
+ else
+ return res;
+ }
+}
+
+/* Set the mixer DEV to the list of values in VALUE_LIST. Return 0 on
+ success, or a negative error code. */
+int
+ac97_set_values (struct ac97_hwint *dev,
+ struct ac97_mixer_value_list *value_list)
+{
+ int x;
+
+ for (x = 0; value_list[x].oss_channel != -1; x++) {
+ int chnum = value_list[x].oss_channel;
+ struct ac97_chn_desc *chent = ac97_find_chndesc (dev, chnum);
+ if (chent != NULL) {
+ u16 val;
+ int res;
+
+ if (chent->is_stereo)
+ val = (value_list[x].value.stereo.right << 8)
+ | value_list[x].value.stereo.left;
+ else {
+ /* We do this so the returned value looks OK in the
+ mixer app. It's not necessary otherwise. */
+ val = (value_list[x].value.mono << 8)
+ | value_list[x].value.mono;
+ }
+ res = ac97_set_mixer (dev, chnum, val);
+ if (res < 0)
+ return res;
+ }
+ else
+ return -ENODEV;
+ }
+ return 0;
+}
+
+int
+ac97_mixer_ioctl (struct ac97_hwint *dev, unsigned int cmd, void __user *arg)
+{
+ int ret;
+
+ switch (cmd) {
+ case SOUND_MIXER_READ_RECSRC:
+ ret = ac97_get_recmask (dev);
+ break;
+
+ case SOUND_MIXER_WRITE_RECSRC:
+ {
+ if (get_user (ret, (int __user *) arg))
+ ret = -EFAULT;
+ else
+ ret = ac97_set_recmask (dev, ret);
+ }
+ break;
+
+ case SOUND_MIXER_READ_CAPS:
+ ret = SOUND_CAP_EXCL_INPUT;
+ break;
+
+ case SOUND_MIXER_READ_DEVMASK:
+ ret = dev->mixer_devmask;
+ break;
+
+ case SOUND_MIXER_READ_RECMASK:
+ ret = dev->mixer_recmask;
+ break;
+
+ case SOUND_MIXER_READ_STEREODEVS:
+ ret = dev->mixer_stereomask;
+ break;
+
+ default:
+ /* Read or write request. */
+ ret = -EINVAL;
+ if (_IOC_TYPE (cmd) == 'M') {
+ int dir = _SIOC_DIR (cmd);
+ int channel = _IOC_NR (cmd);
+
+ if (channel >= 0 && channel < SOUND_MIXER_NRDEVICES) {
+ ret = 0;
+ if (dir & _SIOC_WRITE) {
+ int val;
+ if (get_user (val, (int __user *) arg) == 0)
+ ret = ac97_set_mixer (dev, channel, val);
+ else
+ ret = -EFAULT;
+ }
+ if (ret >= 0 && (dir & _SIOC_READ)) {
+ if (dev->last_written_OSS_values[channel]
+ == AC97_REGVAL_UNKNOWN)
+ dev->last_written_OSS_values[channel]
+ = ac97_get_mixer_scaled (dev, channel);
+ ret = dev->last_written_OSS_values[channel];
+ }
+ }
+ }
+ break;
+ }
+
+ if (ret < 0)
+ return ret;
+ else
+ return put_user(ret, (int __user *) arg);
+}
+
+EXPORT_SYMBOL(ac97_init);
+EXPORT_SYMBOL(ac97_set_values);
+EXPORT_SYMBOL(ac97_put_register);
+EXPORT_SYMBOL(ac97_mixer_ioctl);
+EXPORT_SYMBOL(ac97_reset);
+MODULE_LICENSE("GPL");
+
+
+/*
+ * Local variables:
+ * c-basic-offset: 4
+ * End:
+ */