ALSA: ctxfi - Add PM support

Added the suspend/resume support to ctxfi driver.

The team tested on the following seems ok:
  AMD Athlon 64 3500+ / ASUS A8N-E / 512MB DDR ATI / Radeon X1300
  20k1 & 20k2 cards

Signed-off-by: Wai Yew CHAY <wychay@ctl.creative.com>
Singed-off-by: Ryan RICHARDS <ryan_richards@creativelabs.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 66 insertions, 17 deletions

diff --git a/sound/pci/ctxfi/cthw20k1.c b/sound/pci/ctxfi/cthw20k1.c
index cb69d9d..ad3e1d1 100644
--- a/sound/pci/ctxfi/cthw20k1.c
+++ b/sound/pci/ctxfi/cthw20k1.c
@@ -1911,9 +1911,17 @@ static int hw_card_start(struct hw *hw)
 		goto error1;
 	}
 
-	err = pci_request_regions(pci, "XFi");
-	if (err < 0)
-		goto error1;
+	if (!hw->io_base) {
+		err = pci_request_regions(pci, "XFi");
+		if (err < 0)
+			goto error1;
+
+		if (hw->model == CTUAA)
+			hw->io_base = pci_resource_start(pci, 5);
+		else
+			hw->io_base = pci_resource_start(pci, 0);
+
+	}
 
 	/* Switch to X-Fi mode from UAA mode if neeeded */
 	if (hw->model == CTUAA) {
@@ -1921,18 +1929,17 @@ static int hw_card_start(struct hw *hw)
 		if (err)
 			goto error2;
 
-		hw->io_base = pci_resource_start(pci, 5);
-	} else {
-		hw->io_base = pci_resource_start(pci, 0);
 	}
 
-	err = request_irq(pci->irq, ct_20k1_interrupt, IRQF_SHARED,
-			  "ctxfi", hw);
-	if (err < 0) {
-		printk(KERN_ERR "XFi: Cannot get irq %d\n", pci->irq);
-		goto error2;
+	if (hw->irq < 0) {
+		err = request_irq(pci->irq, ct_20k1_interrupt, IRQF_SHARED,
+				  "ctxfi", hw);
+		if (err < 0) {
+			printk(KERN_ERR "XFi: Cannot get irq %d\n", pci->irq);
+			goto error2;
+		}
+		hw->irq = pci->irq;
 	}
-	hw->irq = pci->irq;
 
 	pci_set_master(pci);
 
@@ -1948,6 +1955,15 @@ error1:
 
 static int hw_card_stop(struct hw *hw)
 {
+	unsigned int data;
+
+	/* disable transport bus master and queueing of request */
+	hw_write_20kx(hw, TRNCTL, 0x00);
+
+	/* disable pll */
+	data = hw_read_20kx(hw, PLLCTL);
+	hw_write_20kx(hw, PLLCTL, (data & (~(0x0F<<12))));
+
 	/* TODO: Disable interrupt and so on... */
 	if (hw->irq >= 0)
 		synchronize_irq(hw->irq);
@@ -1987,11 +2003,9 @@ static int hw_card_init(struct hw *hw, struct card_conf *info)
 	struct trn_conf trn_info = {0};
 
 	/* Get PCI io port base address and do Hendrix switch if needed. */
-	if (!hw->io_base) {
-		err = hw_card_start(hw);
-		if (err)
-			return err;
-	}
+	err = hw_card_start(hw);
+	if (err)
+		return err;
 
 	/* PLL init */
 	err = hw_pll_init(hw, info->rsr);
@@ -2064,6 +2078,37 @@ static int hw_card_init(struct hw *hw, struct card_conf *info)
 	return 0;
 }
 
+#ifdef CONFIG_PM
+static int hw_suspend(struct hw *hw, pm_message_t state)
+{
+	struct pci_dev *pci = hw->pci;
+
+	hw_card_stop(hw);
+
+	if (hw->model == CTUAA) {
+		/* Switch to UAA config space. */
+		pci_write_config_dword(pci, UAA_CFG_SPACE_FLAG, 0x0);
+	}
+
+	pci_disable_device(pci);
+	pci_save_state(pci);
+	pci_set_power_state(pci, pci_choose_state(pci, state));
+
+	return 0;
+}
+
+static int hw_resume(struct hw *hw, struct card_conf *info)
+{
+	struct pci_dev *pci = hw->pci;
+
+	pci_set_power_state(pci, PCI_D0);
+	pci_restore_state(pci);
+
+	/* Re-initialize card hardware. */
+	return hw_card_init(hw, info);
+}
+#endif
+
 static u32 hw_read_20kx(struct hw *hw, u32 reg)
 {
 	u32 value;
@@ -2128,6 +2173,10 @@ static struct hw ct20k1_preset __devinitdata = {
 	.is_adc_source_selected = hw_is_adc_input_selected,
 	.select_adc_source = hw_adc_input_select,
 	.have_digit_io_switch = hw_have_digit_io_switch,
+#ifdef CONFIG_PM
+	.suspend = hw_suspend,
+	.resume = hw_resume,
+#endif
 
 	.src_rsc_get_ctrl_blk = src_get_rsc_ctrl_blk,
 	.src_rsc_put_ctrl_blk = src_put_rsc_ctrl_blk,