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0ab6225154
When the user has a volume key pressed volume_key variable will contain either value 'down' or 'up', otherwise it will be empty. Signed-off-by: Ondrej Jirman <megous@megous.com>
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
#include <common.h>
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#include <asm/io.h>
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#include "lradc.h"
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#define LRADC_BASE 0x1c21800
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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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/* 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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/* 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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// this is for PinePhone only
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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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val = readl(LRADC_DATA0) & 0x3f;
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val = val * vref / 63;
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// printf("lradc=%u\n", val);
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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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return 0;
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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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writel(0xffffffff, LRADC_INTS);
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writel(0, LRADC_INTC);
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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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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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/* 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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