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, 52 insertions, 13 deletions

diff --git a/sound/pci/ctxfi/cthw20k2.c b/sound/pci/ctxfi/cthw20k2.c
index 4493a51c6b01..dec46d04b041 100644
--- a/sound/pci/ctxfi/cthw20k2.c
+++ b/sound/pci/ctxfi/cthw20k2.c
@@ -1860,16 +1860,18 @@ 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;
 
-        hw->io_base = pci_resource_start(hw->pci, 2);
-        hw->mem_base = (unsigned long)ioremap(hw->io_base,
+                hw->io_base = pci_resource_start(hw->pci, 2);
+                hw->mem_base = (unsigned long)ioremap(hw->io_base,
                                         pci_resource_len(hw->pci, 2));
-        if (NULL == (void *)hw->mem_base) {
-                err = -ENOENT;
-                goto error2;
+                if (NULL == (void *)hw->mem_base) {
+                        err = -ENOENT;
+                        goto error2;
+                }
         }
 
         /* Switch to 20k2 mode from UAA mode. */
@@ -1901,6 +1903,15 @@ error1:
 
 static int hw_card_stop(struct hw *hw)
 {
+        unsigned int data;
+
+        /* disable transport bus master and queueing of request */
+        hw_write_20kx(hw, TRANSPORT_CTL, 0x00);
+
+        /* disable pll */
+        data = hw_read_20kx(hw, PLL_ENB);
+        hw_write_20kx(hw, PLL_ENB, (data & (~0x07)));
+
         /* TODO: Disable interrupt and so on... */
         return 0;
 }
@@ -1939,11 +1950,9 @@ static int hw_card_init(struct hw *hw, struct card_conf *info)
 
         /* Get PCI io port/memory base address and
          * do 20kx core 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);
@@ -2006,6 +2015,32 @@ 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);
+
+        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)
 {
         return readl((void *)(hw->mem_base + reg));
@@ -2025,6 +2060,10 @@ static struct hw ct20k2_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,