Merge tag 'tags/mute-led-rework' into for-next

ALSA: control - add generic LED API

This patchset tries to resolve the diversity in the audio LED
control among the ALSA drivers. A new control layer registration
is introduced which allows to run additional operations on
top of the elementary ALSA sound controls.

A new control access group (three bits in the access flags)
was introduced to carry the LED group information for
the sound controls. The low-level sound drivers can just
mark those controls using this access group. This information
is not exported to the user space, but user space can
manage the LED sound control associations through sysfs
(last patch) per Mark's request. It makes things fully
configurable in the kernel and user space (UCM).

The actual state ('route') evaluation is really easy
(the minimal value check for all channels / controls / cards).
If there's more complicated logic for a given hardware,
the card driver may eventually export a new read-only
sound control for the LED group and do the logic itself.

The new LED trigger control code is completely separated
and possibly optional (there's no symbol dependency).
The full code separation allows eventually to move this
LED trigger control to the user space in future.
Actually it replaces the already present functionality
in the kernel space (HDA drivers) and allows a quick adoption
for the recent hardware (ASoC codecs including SoundWire).

snd_ctl_led            24576  0

The sound driver implementation is really easy:

1) call snd_ctl_led_request() when control LED layer should be
   automatically activated
   / it calls module_request("snd-ctl-led") on demand /
2) mark all related kcontrols with
        SNDRV_CTL_ELEM_ACCESS_SPK_LED or
        SNDRV_CTL_ELEM_ACCESS_MIC_LED

Link: https://lore.kernel.org/r/20210317172945.842280-1-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@suse.de>

8 files changed, 15 insertions, 63 deletions

diff --git a/arch/arm/mach-imx/avic.c b/arch/arm/mach-imx/avic.c
index 322caa21bcb3..21bce4049cec 100644
--- a/arch/arm/mach-imx/avic.c
+++ b/arch/arm/mach-imx/avic.c
@@ -7,6 +7,7 @@
 #include <linux/module.h>
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
+#include <linux/irqchip.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
@@ -162,7 +163,7 @@ static void __exception_irq_entry avic_handle_irq(struct pt_regs *regs)
  * interrupts. It registers the interrupt enable and disable functions
  * to the kernel for each interrupt source.
  */
-void __init mxc_init_irq(void __iomem *irqbase)
+static void __init mxc_init_irq(void __iomem *irqbase)
 {
 	struct device_node *np;
 	int irq_base;
@@ -220,3 +221,16 @@ void __init mxc_init_irq(void __iomem *irqbase)
 
 	printk(KERN_INFO "MXC IRQ initialized\n");
 }
+
+static int __init imx_avic_init(struct device_node *node,
+			       struct device_node *parent)
+{
+	void __iomem *avic_base;
+
+	avic_base = of_iomap(node, 0);
+	BUG_ON(!avic_base);
+	mxc_init_irq(avic_base);
+	return 0;
+}
+
+IRQCHIP_DECLARE(imx_avic, "fsl,avic", imx_avic_init);
diff --git a/arch/arm/mach-imx/common.h b/arch/arm/mach-imx/common.h
index 2b004cc4f95e..474dedb73bc7 100644
--- a/arch/arm/mach-imx/common.h
+++ b/arch/arm/mach-imx/common.h
@@ -22,7 +22,6 @@ void mx35_map_io(void);
 void imx21_init_early(void);
 void imx31_init_early(void);
 void imx35_init_early(void);
-void mxc_init_irq(void __iomem *);
 void mx31_init_irq(void);
 void mx35_init_irq(void);
 void mxc_set_cpu_type(unsigned int type);
diff --git a/arch/arm/mach-imx/mach-imx1.c b/arch/arm/mach-imx/mach-imx1.c
index 32df3b8012f9..8eca92d66a2e 100644
--- a/arch/arm/mach-imx/mach-imx1.c
+++ b/arch/arm/mach-imx/mach-imx1.c
@@ -17,16 +17,6 @@ static void __init imx1_init_early(void)
 	mxc_set_cpu_type(MXC_CPU_MX1);
 }
 
-static void __init imx1_init_irq(void)
-{
-	void __iomem *avic_addr;
-
-	avic_addr = ioremap(MX1_AVIC_ADDR, SZ_4K);
-	WARN_ON(!avic_addr);
-
-	mxc_init_irq(avic_addr);
-}
-
 static const char * const imx1_dt_board_compat[] __initconst = {
 	"fsl,imx1",
 	NULL
@@ -34,7 +24,6 @@ static const char * const imx1_dt_board_compat[] __initconst = {
 
 DT_MACHINE_START(IMX1_DT, "Freescale i.MX1 (Device Tree Support)")
 	.init_early	= imx1_init_early,
-	.init_irq	= imx1_init_irq,
 	.dt_compat	= imx1_dt_board_compat,
 	.restart	= mxc_restart,
 MACHINE_END
diff --git a/arch/arm/mach-imx/mach-imx25.c b/arch/arm/mach-imx/mach-imx25.c
index 95de48a1aa7d..51927bd08aef 100644
--- a/arch/arm/mach-imx/mach-imx25.c
+++ b/arch/arm/mach-imx/mach-imx25.c
@@ -22,17 +22,6 @@ static void __init imx25_dt_init(void)
 	imx_aips_allow_unprivileged_access("fsl,imx25-aips");
 }
 
-static void __init mx25_init_irq(void)
-{
-	struct device_node *np;
-	void __iomem *avic_base;
-
-	np = of_find_compatible_node(NULL, NULL, "fsl,avic");
-	avic_base = of_iomap(np, 0);
-	BUG_ON(!avic_base);
-	mxc_init_irq(avic_base);
-}
-
 static const char * const imx25_dt_board_compat[] __initconst = {
 	"fsl,imx25",
 	NULL
@@ -42,6 +31,5 @@ DT_MACHINE_START(IMX25_DT, "Freescale i.MX25 (Device Tree Support)")
 	.init_early	= imx25_init_early,
 	.init_machine	= imx25_dt_init,
 	.init_late      = imx25_pm_init,
-	.init_irq	= mx25_init_irq,
 	.dt_compat	= imx25_dt_board_compat,
 MACHINE_END
diff --git a/arch/arm/mach-imx/mach-imx27.c b/arch/arm/mach-imx/mach-imx27.c
index 262422a9c196..e325c9468105 100644
--- a/arch/arm/mach-imx/mach-imx27.c
+++ b/arch/arm/mach-imx/mach-imx27.c
@@ -56,17 +56,6 @@ static void __init imx27_init_early(void)
 	mxc_set_cpu_type(MXC_CPU_MX27);
 }
 
-static void __init mx27_init_irq(void)
-{
-	void __iomem *avic_base;
-	struct device_node *np;
-
-	np = of_find_compatible_node(NULL, NULL, "fsl,avic");
-	avic_base = of_iomap(np, 0);
-	BUG_ON(!avic_base);
-	mxc_init_irq(avic_base);
-}
-
 static const char * const imx27_dt_board_compat[] __initconst = {
 	"fsl,imx27",
 	NULL
@@ -75,7 +64,6 @@ static const char * const imx27_dt_board_compat[] __initconst = {
 DT_MACHINE_START(IMX27_DT, "Freescale i.MX27 (Device Tree Support)")
 	.map_io		= mx27_map_io,
 	.init_early	= imx27_init_early,
-	.init_irq	= mx27_init_irq,
 	.init_late	= imx27_pm_init,
 	.dt_compat	= imx27_dt_board_compat,
 MACHINE_END
diff --git a/arch/arm/mach-imx/mach-imx31.c b/arch/arm/mach-imx/mach-imx31.c
index dc69dfe600df..e9a1092b6093 100644
--- a/arch/arm/mach-imx/mach-imx31.c
+++ b/arch/arm/mach-imx/mach-imx31.c
@@ -14,6 +14,5 @@ static const char * const imx31_dt_board_compat[] __initconst = {
 DT_MACHINE_START(IMX31_DT, "Freescale i.MX31 (Device Tree Support)")
 	.map_io		= mx31_map_io,
 	.init_early	= imx31_init_early,
-	.init_irq	= mx31_init_irq,
 	.dt_compat	= imx31_dt_board_compat,
 MACHINE_END
diff --git a/arch/arm/mach-imx/mach-imx35.c b/arch/arm/mach-imx/mach-imx35.c
index ec5c3068715c..0fc08218b77d 100644
--- a/arch/arm/mach-imx/mach-imx35.c
+++ b/arch/arm/mach-imx/mach-imx35.c
@@ -27,6 +27,5 @@ DT_MACHINE_START(IMX35_DT, "Freescale i.MX35 (Device Tree Support)")
 	.l2c_aux_mask	= ~0,
 	.map_io		= mx35_map_io,
 	.init_early	= imx35_init_early,
-	.init_irq	= mx35_init_irq,
 	.dt_compat	= imx35_dt_board_compat,
 MACHINE_END
diff --git a/arch/arm/mach-imx/mm-imx3.c b/arch/arm/mach-imx/mm-imx3.c
index 5056438e5b42..28db97289ee8 100644
--- a/arch/arm/mach-imx/mm-imx3.c
+++ b/arch/arm/mach-imx/mm-imx3.c
@@ -109,18 +109,6 @@ void __init imx31_init_early(void)
 	mx3_ccm_base = of_iomap(np, 0);
 	BUG_ON(!mx3_ccm_base);
 }
-
-void __init mx31_init_irq(void)
-{
-	void __iomem *avic_base;
-	struct device_node *np;
-
-	np = of_find_compatible_node(NULL, NULL, "fsl,imx31-avic");
-	avic_base = of_iomap(np, 0);
-	BUG_ON(!avic_base);
-
-	mxc_init_irq(avic_base);
-}
 #endif /* ifdef CONFIG_SOC_IMX31 */
 
 #ifdef CONFIG_SOC_IMX35
@@ -158,16 +146,4 @@ void __init imx35_init_early(void)
 	mx3_ccm_base = of_iomap(np, 0);
 	BUG_ON(!mx3_ccm_base);
 }
-
-void __init mx35_init_irq(void)
-{
-	void __iomem *avic_base;
-	struct device_node *np;
-
-	np = of_find_compatible_node(NULL, NULL, "fsl,imx35-avic");
-	avic_base = of_iomap(np, 0);
-	BUG_ON(!avic_base);
-
-	mxc_init_irq(avic_base);
-}
 #endif /* ifdef CONFIG_SOC_IMX35 */