178 lines
4.6 KiB
Diff
178 lines
4.6 KiB
Diff
From 0612580e68fa584d415f8080f65da2d4873664fe Mon Sep 17 00:00:00 2001
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From: Ondrej Jirman <megous@megous.com>
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Date: Tue, 11 Feb 2020 14:10:05 +0100
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Subject: [PATCH 23/29] pinephone: Add volume_key environment variable
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When the user has a volume key pressed volume_key variable will
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contain either value 'down' or 'up', otherwise it will be empty.
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Signed-off-by: Ondrej Jirman <megous@megous.com>
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---
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board/sunxi/Makefile | 1 +
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board/sunxi/board.c | 18 ++++++++++
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board/sunxi/lradc.c | 81 ++++++++++++++++++++++++++++++++++++++++++++
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board/sunxi/lradc.h | 11 ++++++
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4 files changed, 111 insertions(+)
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create mode 100644 board/sunxi/lradc.c
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create mode 100644 board/sunxi/lradc.h
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diff --git a/board/sunxi/Makefile b/board/sunxi/Makefile
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index d96b7897..a096a5c7 100644
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--- a/board/sunxi/Makefile
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+++ b/board/sunxi/Makefile
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@@ -12,3 +12,4 @@ obj-$(CONFIG_MACH_SUN4I) += dram_sun4i_auto.o
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obj-$(CONFIG_MACH_SUN5I) += dram_sun5i_auto.o
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obj-$(CONFIG_MACH_SUN7I) += dram_sun5i_auto.o
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obj-$(CONFIG_CHIP_DIP_SCAN) += chip.o
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+obj-$(CONFIG_MACH_SUN50I) += lradc.o
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diff --git a/board/sunxi/board.c b/board/sunxi/board.c
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index 2790a0f9..50344342 100644
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--- a/board/sunxi/board.c
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+++ b/board/sunxi/board.c
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@@ -46,6 +46,7 @@
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#include <spl.h>
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#include <sy8106a.h>
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#include <asm/setup.h>
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+#include "lradc.h"
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#include <status_led.h>
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DECLARE_GLOBAL_DATA_PTR;
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@@ -588,6 +589,12 @@ void sunxi_board_init(void)
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{
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int power_failed = 0;
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+#ifdef CONFIG_MACH_SUN50I
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+ // we init the lradc in SPL to get the ADC started early to have
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+ // a valid sample when U-Boot main binary gets executed.
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+ lradc_enable();
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+#endif
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+
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#ifdef CONFIG_LED_STATUS
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if (IS_ENABLED(CONFIG_SPL_DRIVERS_MISC))
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status_led_init();
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@@ -861,6 +868,17 @@ int misc_init_r(void)
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env_set("fdtfile", str);
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}
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+#ifdef CONFIG_MACH_SUN50I
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+ int key = lradc_get_pressed_key();
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+ if (key == KEY_VOLUMEDOWN)
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+ env_set("volume_key", "down");
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+ else if (key == KEY_VOLUMEUP)
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+ env_set("volume_key", "up");
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+
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+ // no longer needed
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+ lradc_disable();
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+#endif
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+
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setup_environment(gd->fdt_blob);
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return 0;
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diff --git a/board/sunxi/lradc.c b/board/sunxi/lradc.c
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new file mode 100644
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index 00000000..693b198e
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--- /dev/null
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+++ b/board/sunxi/lradc.c
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@@ -0,0 +1,81 @@
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+#include <common.h>
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+#include <asm/io.h>
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+#include "lradc.h"
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+
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+#define LRADC_BASE 0x1c21800
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+
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+#define LRADC_CTRL (LRADC_BASE + 0x00)
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+#define LRADC_INTC (LRADC_BASE + 0x04)
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+#define LRADC_INTS (LRADC_BASE + 0x08)
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+#define LRADC_DATA0 (LRADC_BASE + 0x0c)
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+#define LRADC_DATA1 (LRADC_BASE + 0x10)
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+
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+/* LRADC_CTRL bits */
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+#define FIRST_CONVERT_DLY(x) ((x) << 24) /* 8 bits */
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+#define CHAN_SELECT(x) ((x) << 22) /* 2 bits */
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+#define CONTINUE_TIME_SEL(x) ((x) << 16) /* 4 bits */
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+#define KEY_MODE_SEL(x) ((x) << 12) /* 2 bits */
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+#define LEVELA_B_CNT(x) ((x) << 8) /* 4 bits */
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+#define HOLD_KEY_EN(x) ((x) << 7)
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+#define HOLD_EN(x) ((x) << 6)
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+#define LEVELB_VOL(x) ((x) << 4) /* 2 bits */
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+#define SAMPLE_RATE(x) ((x) << 2) /* 2 bits */
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+#define ENABLE(x) ((x) << 0)
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+
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+/* LRADC_INTC and LRADC_INTS bits */
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+#define CHAN1_KEYUP_IRQ BIT(12)
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+#define CHAN1_ALRDY_HOLD_IRQ BIT(11)
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+#define CHAN1_HOLD_IRQ BIT(10)
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+#define CHAN1_KEYDOWN_IRQ BIT(9)
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+#define CHAN1_DATA_IRQ BIT(8)
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+#define CHAN0_KEYUP_IRQ BIT(4)
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+#define CHAN0_ALRDY_HOLD_IRQ BIT(3)
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+#define CHAN0_HOLD_IRQ BIT(2)
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+#define CHAN0_KEYDOWN_IRQ BIT(1)
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+#define CHAN0_DATA_IRQ BIT(0)
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+
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+// this is for PinePhone only
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+
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+int lradc_get_pressed_key(void)
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+{
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+ uint32_t val;
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+ uint32_t vref = 3000000 * 2 / 3;
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+
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+ val = readl(LRADC_DATA0) & 0x3f;
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+ val = val * vref / 63;
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+
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+// printf("lradc=%u\n", val);
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+
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+ if (val < 200000) // 158730
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+ return KEY_VOLUMEUP;
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+ else if (val < 400000) // 349206
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+ return KEY_VOLUMEDOWN;
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+
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+ return 0;
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+}
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+
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+void lradc_enable(void)
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+{
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+ // aldo3 is always on and defaults to 3V
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+
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+ writel(0xffffffff, LRADC_INTS);
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+ writel(0, LRADC_INTC);
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+
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+ /*
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+ * Set sample time to 4 ms / 250 Hz. Wait 2 * 4 ms for key to
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+ * stabilize on press, wait (1 + 1) * 4 ms for key release
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+ */
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+ writel(FIRST_CONVERT_DLY(0) | LEVELA_B_CNT(0) | HOLD_EN(0) |
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+ SAMPLE_RATE(0) | ENABLE(1), LRADC_CTRL);
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+
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+}
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+
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+void lradc_disable(void)
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+{
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+ writel(0xffffffff, LRADC_INTS);
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+ writel(0, LRADC_INTC);
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+
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+ /* Disable lradc, leave other settings unchanged */
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+ writel(FIRST_CONVERT_DLY(2) | LEVELA_B_CNT(1) | HOLD_EN(1) |
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+ SAMPLE_RATE(2), LRADC_CTRL);
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+}
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diff --git a/board/sunxi/lradc.h b/board/sunxi/lradc.h
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new file mode 100644
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index 00000000..c908401b
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--- /dev/null
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+++ b/board/sunxi/lradc.h
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@@ -0,0 +1,11 @@
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+#pragma once
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+
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+enum {
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+ KEY_NONE = 0,
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+ KEY_VOLUMEDOWN = 1,
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+ KEY_VOLUMEUP = 2,
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+};
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+
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+int lradc_get_pressed_key(void);
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+void lradc_enable(void);
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+void lradc_disable(void);
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--
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2.34.1
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