Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Allwinner sun4i low res adc attached tablet keys driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2014 Hans de Goede <hdegoede@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Allwinnner sunxi SoCs have a lradc which is specifically designed to have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * various (tablet) keys (ie home, back, search, etc). attached to it using
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * a resistor network. This driver is for the keys on such boards.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * There are 2 channels, currently this driver only supports channel 0 since
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  * there are no boards known to use channel 1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/of_platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/regulator/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define LRADC_CTRL		0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define LRADC_INTC		0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define LRADC_INTS		0x08
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define LRADC_DATA0		0x0c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define LRADC_DATA1		0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) /* LRADC_CTRL bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #define FIRST_CONVERT_DLY(x)	((x) << 24) /* 8 bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #define CHAN_SELECT(x)		((x) << 22) /* 2 bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #define CONTINUE_TIME_SEL(x)	((x) << 16) /* 4 bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #define KEY_MODE_SEL(x)		((x) << 12) /* 2 bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #define LEVELA_B_CNT(x)		((x) << 8)  /* 4 bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #define HOLD_KEY_EN(x)		((x) << 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #define HOLD_EN(x)		((x) << 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) #define LEVELB_VOL(x)		((x) << 4)  /* 2 bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #define SAMPLE_RATE(x)		((x) << 2)  /* 2 bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #define ENABLE(x)		((x) << 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) /* LRADC_INTC and LRADC_INTS bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) #define CHAN1_KEYUP_IRQ		BIT(12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) #define CHAN1_ALRDY_HOLD_IRQ	BIT(11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) #define CHAN1_HOLD_IRQ		BIT(10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) #define	CHAN1_KEYDOWN_IRQ	BIT(9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) #define CHAN1_DATA_IRQ		BIT(8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) #define CHAN0_KEYUP_IRQ		BIT(4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) #define CHAN0_ALRDY_HOLD_IRQ	BIT(3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) #define CHAN0_HOLD_IRQ		BIT(2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) #define	CHAN0_KEYDOWN_IRQ	BIT(1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) #define CHAN0_DATA_IRQ		BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) /* struct lradc_variant - Describe sun4i-a10-lradc-keys hardware variant
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  * @divisor_numerator:		The numerator of lradc Vref internally divisor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  * @divisor_denominator:	The denominator of lradc Vref internally divisor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) struct lradc_variant {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	u8 divisor_numerator;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	u8 divisor_denominator;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) static const struct lradc_variant lradc_variant_a10 = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	.divisor_numerator = 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	.divisor_denominator = 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) static const struct lradc_variant r_lradc_variant_a83t = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	.divisor_numerator = 3,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	.divisor_denominator = 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) struct sun4i_lradc_keymap {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	u32 voltage;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	u32 keycode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) struct sun4i_lradc_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	struct input_dev *input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	struct regulator *vref_supply;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	struct sun4i_lradc_keymap *chan0_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	const struct lradc_variant *variant;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	u32 chan0_map_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	u32 chan0_keycode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	u32 vref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) static irqreturn_t sun4i_lradc_irq(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	struct sun4i_lradc_data *lradc = dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	u32 i, ints, val, voltage, diff, keycode = 0, closest = 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	ints  = readl(lradc->base + LRADC_INTS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	 * lradc supports only one keypress at a time, release does not give
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	 * any info as to which key was released, so we cache the keycode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	if (ints & CHAN0_KEYUP_IRQ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		input_report_key(lradc->input, lradc->chan0_keycode, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		lradc->chan0_keycode = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	if ((ints & CHAN0_KEYDOWN_IRQ) && lradc->chan0_keycode == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		val = readl(lradc->base + LRADC_DATA0) & 0x3f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		voltage = val * lradc->vref / 63;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		for (i = 0; i < lradc->chan0_map_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 			diff = abs(lradc->chan0_map[i].voltage - voltage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 			if (diff < closest) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 				closest = diff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 				keycode = lradc->chan0_map[i].keycode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		lradc->chan0_keycode = keycode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		input_report_key(lradc->input, lradc->chan0_keycode, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	input_sync(lradc->input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	writel(ints, lradc->base + LRADC_INTS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static int sun4i_lradc_open(struct input_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	struct sun4i_lradc_data *lradc = input_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	error = regulator_enable(lradc->vref_supply);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	lradc->vref = regulator_get_voltage(lradc->vref_supply) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		      lradc->variant->divisor_numerator /
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		      lradc->variant->divisor_denominator;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	 * Set sample time to 4 ms / 250 Hz. Wait 2 * 4 ms for key to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	 * stabilize on press, wait (1 + 1) * 4 ms for key release
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	writel(FIRST_CONVERT_DLY(2) | LEVELA_B_CNT(1) | HOLD_EN(1) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		SAMPLE_RATE(0) | ENABLE(1), lradc->base + LRADC_CTRL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	writel(CHAN0_KEYUP_IRQ | CHAN0_KEYDOWN_IRQ, lradc->base + LRADC_INTC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) static void sun4i_lradc_close(struct input_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	struct sun4i_lradc_data *lradc = input_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	/* Disable lradc, leave other settings unchanged */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	writel(FIRST_CONVERT_DLY(2) | LEVELA_B_CNT(1) | HOLD_EN(1) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		SAMPLE_RATE(2), lradc->base + LRADC_CTRL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	writel(0, lradc->base + LRADC_INTC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	regulator_disable(lradc->vref_supply);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) static int sun4i_lradc_load_dt_keymap(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 				      struct sun4i_lradc_data *lradc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	struct device_node *np, *pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	np = dev->of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	if (!np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	lradc->chan0_map_count = of_get_child_count(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	if (lradc->chan0_map_count == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		dev_err(dev, "keymap is missing in device tree\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	lradc->chan0_map = devm_kmalloc_array(dev, lradc->chan0_map_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 					      sizeof(struct sun4i_lradc_keymap),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 					      GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (!lradc->chan0_map)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	for_each_child_of_node(np, pp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		struct sun4i_lradc_keymap *map = &lradc->chan0_map[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		u32 channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		error = of_property_read_u32(pp, "channel", &channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		if (error || channel != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 			dev_err(dev, "%pOFn: Inval channel prop\n", pp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 			of_node_put(pp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		error = of_property_read_u32(pp, "voltage", &map->voltage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 			dev_err(dev, "%pOFn: Inval voltage prop\n", pp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 			of_node_put(pp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		error = of_property_read_u32(pp, "linux,code", &map->keycode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 			dev_err(dev, "%pOFn: Inval linux,code prop\n", pp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 			of_node_put(pp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) static int sun4i_lradc_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	struct sun4i_lradc_data *lradc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	lradc = devm_kzalloc(dev, sizeof(struct sun4i_lradc_data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	if (!lradc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	error = sun4i_lradc_load_dt_keymap(dev, lradc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	lradc->variant = of_device_get_match_data(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	if (!lradc->variant) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		dev_err(&pdev->dev, "Missing sun4i-a10-lradc-keys variant\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	lradc->vref_supply = devm_regulator_get(dev, "vref");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	if (IS_ERR(lradc->vref_supply))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		return PTR_ERR(lradc->vref_supply);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	lradc->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	lradc->input = devm_input_allocate_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	if (!lradc->input)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	lradc->input->name = pdev->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	lradc->input->phys = "sun4i_lradc/input0";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	lradc->input->open = sun4i_lradc_open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	lradc->input->close = sun4i_lradc_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	lradc->input->id.bustype = BUS_HOST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	lradc->input->id.vendor = 0x0001;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	lradc->input->id.product = 0x0001;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	lradc->input->id.version = 0x0100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	__set_bit(EV_KEY, lradc->input->evbit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	for (i = 0; i < lradc->chan0_map_count; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		__set_bit(lradc->chan0_map[i].keycode, lradc->input->keybit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	input_set_drvdata(lradc->input, lradc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	lradc->base = devm_ioremap_resource(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 			      platform_get_resource(pdev, IORESOURCE_MEM, 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	if (IS_ERR(lradc->base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		return PTR_ERR(lradc->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	error = devm_request_irq(dev, platform_get_irq(pdev, 0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 				 sun4i_lradc_irq, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 				 "sun4i-a10-lradc-keys", lradc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	error = input_register_device(lradc->input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) static const struct of_device_id sun4i_lradc_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	{ .compatible = "allwinner,sun4i-a10-lradc-keys",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		.data = &lradc_variant_a10 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	{ .compatible = "allwinner,sun8i-a83t-r-lradc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		.data = &r_lradc_variant_a83t },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	{ /* sentinel */ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) MODULE_DEVICE_TABLE(of, sun4i_lradc_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) static struct platform_driver sun4i_lradc_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		.name	= "sun4i-a10-lradc-keys",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		.of_match_table = of_match_ptr(sun4i_lradc_of_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	.probe	= sun4i_lradc_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) module_platform_driver(sun4i_lradc_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) MODULE_DESCRIPTION("Allwinner sun4i low res adc attached tablet keys driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) MODULE_LICENSE("GPL");