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linux-next/sound/pci/cs5535audio/cs5535audio.c
Takashi Iwai 20a24225d8 ALSA: PCI: Remove superfluous pci_set_drvdata(pci, NULL) at remove 
As drvdata is cleared to NULL at probe failure or at removal by the
driver core, we don't have to call pci_set_drvdata(pci, NULL) any
longer in each driver.

The only remaining pci_set_drvdata(NULL) is in azx_firmware_cb() in
hda_intel.c.  Since this function itself releases the card instance,
we need to clear drvdata here as well, so that it won't be released
doubly in the remove callback.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-05-29 12:37:32 +02:00

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/*
* Driver for audio on multifunction CS5535/6 companion device
* Copyright (C) Jaya Kumar
*
* Based on Jaroslav Kysela and Takashi Iwai's examples.
* This work was sponsored by CIS(M) Sdn Bhd.
*
* 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 <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <asm/io.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/rawmidi.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/asoundef.h>
#include "cs5535audio.h"
#define DRIVER_NAME "cs5535audio"
static char *ac97_quirk;
module_param(ac97_quirk, charp, 0444);
MODULE_PARM_DESC(ac97_quirk, "AC'97 board specific workarounds.");
static struct ac97_quirk ac97_quirks[] = {
#if 0 /* Not yet confirmed if all 5536 boards are HP only */
{
.subvendor = PCI_VENDOR_ID_AMD,
.subdevice = PCI_DEVICE_ID_AMD_CS5536_AUDIO,
.name = "AMD RDK",
.type = AC97_TUNE_HP_ONLY
},
#endif
{}
};
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for " DRIVER_NAME);
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for " DRIVER_NAME);
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable " DRIVER_NAME);
static DEFINE_PCI_DEVICE_TABLE(snd_cs5535audio_ids) = {
{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_AUDIO) },
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_AUDIO) },
{}
};
MODULE_DEVICE_TABLE(pci, snd_cs5535audio_ids);
static void wait_till_cmd_acked(struct cs5535audio *cs5535au, unsigned long timeout)
{
unsigned int tmp;
do {
tmp = cs_readl(cs5535au, ACC_CODEC_CNTL);
if (!(tmp & CMD_NEW))
break;
udelay(1);
} while (--timeout);
if (!timeout)
snd_printk(KERN_ERR "Failure writing to cs5535 codec\n");
}
static unsigned short snd_cs5535audio_codec_read(struct cs5535audio *cs5535au,
unsigned short reg)
{
unsigned int regdata;
unsigned int timeout;
unsigned int val;
regdata = ((unsigned int) reg) << 24;
regdata |= ACC_CODEC_CNTL_RD_CMD;
regdata |= CMD_NEW;
cs_writel(cs5535au, ACC_CODEC_CNTL, regdata);
wait_till_cmd_acked(cs5535au, 50);
timeout = 50;
do {
val = cs_readl(cs5535au, ACC_CODEC_STATUS);
if ((val & STS_NEW) && reg == (val >> 24))
break;
udelay(1);
} while (--timeout);
if (!timeout)
snd_printk(KERN_ERR "Failure reading codec reg 0x%x,"
"Last value=0x%x\n", reg, val);
return (unsigned short) val;
}
static void snd_cs5535audio_codec_write(struct cs5535audio *cs5535au,
unsigned short reg, unsigned short val)
{
unsigned int regdata;
regdata = ((unsigned int) reg) << 24;
regdata |= val;
regdata &= CMD_MASK;
regdata |= CMD_NEW;
regdata &= ACC_CODEC_CNTL_WR_CMD;
cs_writel(cs5535au, ACC_CODEC_CNTL, regdata);
wait_till_cmd_acked(cs5535au, 50);
}
static void snd_cs5535audio_ac97_codec_write(struct snd_ac97 *ac97,
unsigned short reg, unsigned short val)
{
struct cs5535audio *cs5535au = ac97->private_data;
snd_cs5535audio_codec_write(cs5535au, reg, val);
}
static unsigned short snd_cs5535audio_ac97_codec_read(struct snd_ac97 *ac97,
unsigned short reg)
{
struct cs5535audio *cs5535au = ac97->private_data;
return snd_cs5535audio_codec_read(cs5535au, reg);
}
static int snd_cs5535audio_mixer(struct cs5535audio *cs5535au)
{
struct snd_card *card = cs5535au->card;
struct snd_ac97_bus *pbus;
struct snd_ac97_template ac97;
int err;
static struct snd_ac97_bus_ops ops = {
.write = snd_cs5535audio_ac97_codec_write,
.read = snd_cs5535audio_ac97_codec_read,
};
if ((err = snd_ac97_bus(card, 0, &ops, NULL, &pbus)) < 0)
return err;
memset(&ac97, 0, sizeof(ac97));
ac97.scaps = AC97_SCAP_AUDIO | AC97_SCAP_SKIP_MODEM
| AC97_SCAP_POWER_SAVE;
ac97.private_data = cs5535au;
ac97.pci = cs5535au->pci;
/* set any OLPC-specific scaps */
olpc_prequirks(card, &ac97);
if ((err = snd_ac97_mixer(pbus, &ac97, &cs5535au->ac97)) < 0) {
snd_printk(KERN_ERR "mixer failed\n");
return err;
}
snd_ac97_tune_hardware(cs5535au->ac97, ac97_quirks, ac97_quirk);
err = olpc_quirks(card, cs5535au->ac97);
if (err < 0) {
snd_printk(KERN_ERR "olpc quirks failed\n");
return err;
}
return 0;
}
static void process_bm0_irq(struct cs5535audio *cs5535au)
{
u8 bm_stat;
spin_lock(&cs5535au->reg_lock);
bm_stat = cs_readb(cs5535au, ACC_BM0_STATUS);
spin_unlock(&cs5535au->reg_lock);
if (bm_stat & EOP) {
struct cs5535audio_dma *dma;
dma = cs5535au->playback_substream->runtime->private_data;
snd_pcm_period_elapsed(cs5535au->playback_substream);
} else {
snd_printk(KERN_ERR "unexpected bm0 irq src, bm_stat=%x\n",
bm_stat);
}
}
static void process_bm1_irq(struct cs5535audio *cs5535au)
{
u8 bm_stat;
spin_lock(&cs5535au->reg_lock);
bm_stat = cs_readb(cs5535au, ACC_BM1_STATUS);
spin_unlock(&cs5535au->reg_lock);
if (bm_stat & EOP) {
struct cs5535audio_dma *dma;
dma = cs5535au->capture_substream->runtime->private_data;
snd_pcm_period_elapsed(cs5535au->capture_substream);
}
}
static irqreturn_t snd_cs5535audio_interrupt(int irq, void *dev_id)
{
u16 acc_irq_stat;
unsigned char count;
struct cs5535audio *cs5535au = dev_id;
if (cs5535au == NULL)
return IRQ_NONE;
acc_irq_stat = cs_readw(cs5535au, ACC_IRQ_STATUS);
if (!acc_irq_stat)
return IRQ_NONE;
for (count = 0; count < 4; count++) {
if (acc_irq_stat & (1 << count)) {
switch (count) {
case IRQ_STS:
cs_readl(cs5535au, ACC_GPIO_STATUS);
break;
case WU_IRQ_STS:
cs_readl(cs5535au, ACC_GPIO_STATUS);
break;
case BM0_IRQ_STS:
process_bm0_irq(cs5535au);
break;
case BM1_IRQ_STS:
process_bm1_irq(cs5535au);
break;
default:
snd_printk(KERN_ERR "Unexpected irq src: "
"0x%x\n", acc_irq_stat);
break;
}
}
}
return IRQ_HANDLED;
}
static int snd_cs5535audio_free(struct cs5535audio *cs5535au)
{
synchronize_irq(cs5535au->irq);
pci_set_power_state(cs5535au->pci, 3);
if (cs5535au->irq >= 0)
free_irq(cs5535au->irq, cs5535au);
pci_release_regions(cs5535au->pci);
pci_disable_device(cs5535au->pci);
kfree(cs5535au);
return 0;
}
static int snd_cs5535audio_dev_free(struct snd_device *device)
{
struct cs5535audio *cs5535au = device->device_data;
return snd_cs5535audio_free(cs5535au);
}
static int snd_cs5535audio_create(struct snd_card *card,
struct pci_dev *pci,
struct cs5535audio **rcs5535au)
{
struct cs5535audio *cs5535au;
int err;
static struct snd_device_ops ops = {
.dev_free = snd_cs5535audio_dev_free,
};
*rcs5535au = NULL;
if ((err = pci_enable_device(pci)) < 0)
return err;
if (pci_set_dma_mask(pci, DMA_BIT_MASK(32)) < 0 ||
pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(32)) < 0) {
printk(KERN_WARNING "unable to get 32bit dma\n");
err = -ENXIO;
goto pcifail;
}
cs5535au = kzalloc(sizeof(*cs5535au), GFP_KERNEL);
if (cs5535au == NULL) {
err = -ENOMEM;
goto pcifail;
}
spin_lock_init(&cs5535au->reg_lock);
cs5535au->card = card;
cs5535au->pci = pci;
cs5535au->irq = -1;
if ((err = pci_request_regions(pci, "CS5535 Audio")) < 0) {
kfree(cs5535au);
goto pcifail;
}
cs5535au->port = pci_resource_start(pci, 0);
if (request_irq(pci->irq, snd_cs5535audio_interrupt,
IRQF_SHARED, KBUILD_MODNAME, cs5535au)) {
snd_printk(KERN_ERR "unable to grab IRQ %d\n", pci->irq);
err = -EBUSY;
goto sndfail;
}
cs5535au->irq = pci->irq;
pci_set_master(pci);
if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL,
cs5535au, &ops)) < 0)
goto sndfail;
snd_card_set_dev(card, &pci->dev);
*rcs5535au = cs5535au;
return 0;
sndfail: /* leave the device alive, just kill the snd */
snd_cs5535audio_free(cs5535au);
return err;
pcifail:
pci_disable_device(pci);
return err;
}
static int snd_cs5535audio_probe(struct pci_dev *pci,
const struct pci_device_id *pci_id)
{
static int dev;
struct snd_card *card;
struct cs5535audio *cs5535au;
int err;
if (dev >= SNDRV_CARDS)
return -ENODEV;
if (!enable[dev]) {
dev++;
return -ENOENT;
}
err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card);
if (err < 0)
return err;
if ((err = snd_cs5535audio_create(card, pci, &cs5535au)) < 0)
goto probefail_out;
card->private_data = cs5535au;
if ((err = snd_cs5535audio_mixer(cs5535au)) < 0)
goto probefail_out;
if ((err = snd_cs5535audio_pcm(cs5535au)) < 0)
goto probefail_out;
strcpy(card->driver, DRIVER_NAME);
strcpy(card->shortname, "CS5535 Audio");
sprintf(card->longname, "%s %s at 0x%lx, irq %i",
card->shortname, card->driver,
cs5535au->port, cs5535au->irq);
if ((err = snd_card_register(card)) < 0)
goto probefail_out;
pci_set_drvdata(pci, card);
dev++;
return 0;
probefail_out:
snd_card_free(card);
return err;
}
static void snd_cs5535audio_remove(struct pci_dev *pci)
{
olpc_quirks_cleanup();
snd_card_free(pci_get_drvdata(pci));
}
static struct pci_driver cs5535audio_driver = {
.name = KBUILD_MODNAME,
.id_table = snd_cs5535audio_ids,
.probe = snd_cs5535audio_probe,
.remove = snd_cs5535audio_remove,
#ifdef CONFIG_PM_SLEEP
.driver = {
.pm = &snd_cs5535audio_pm,
},
#endif
};
module_pci_driver(cs5535audio_driver);
MODULE_AUTHOR("Jaya Kumar");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("CS5535 Audio");
MODULE_SUPPORTED_DEVICE("CS5535 Audio");
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