/*
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* (C) Copyright 2021 Rockchip Electronics Co., Ltd
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <adc.h>
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#include <asm/io.h>
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#include <dm/ofnode.h>
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#include <asm/arch/resource_img.h>
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#define is_digit(c) ((c) >= '0' && (c) <= '9')
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#define is_abcd(c) ((c) >= 'a' && (c) <= 'd')
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#define is_equal(c) ((c) == '=')
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#define KEY_WORDS_ADC_CTRL "#_"
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#define KEY_WORDS_ADC_CH "_ch"
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#define KEY_WORDS_GPIO "#gpio"
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#define MAX_ADC_CH_NR 10
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#define MAX_GPIO_NR 10
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static fdt_addr_t gpio_base_addr[MAX_GPIO_NR];
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static uint32_t gpio_record[MAX_GPIO_NR];
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static int adc_record[MAX_ADC_CH_NR];
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#ifdef CONFIG_ROCKCHIP_GPIO_V2
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#define GPIO_SWPORT_DDR 0x08
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#define GPIO_EXT_PORT 0x70
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#define WMSK_SETBIT(n) (n << 16 | n)
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#define WMSK_CLRBIT(n) (n << 16)
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#define REG_PLUS4(off, n) (off + (n >= BIT(16) ? 4 : 0))
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#define BIT_SUB16(n) (n >= BIT(16) ? (n >> 16) : n)
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static int gpio_read(fdt_addr_t gpio_addr, int gpio_bank, int gpio_pin)
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{
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uint32_t off, bit;
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bit = gpio_bank * 8 + gpio_pin;
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off = REG_PLUS4(GPIO_SWPORT_DDR, bit);
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bit = BIT_SUB16(bit);
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writel(WMSK_CLRBIT(bit), gpio_addr + off);
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return readl(gpio_addr + GPIO_EXT_PORT);
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}
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#else
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#define GPIO_SWPORT_DDR 0x04
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#define GPIO_EXT_PORT 0x50
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static int gpio_read(fdt_addr_t gpio_addr, int gpio_bank, int gpio_pin)
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{
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uint32_t val;
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val = readl(gpio_addr + GPIO_SWPORT_DDR);
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val &= ~(1 << (gpio_bank * 8 + gpio_pin));
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writel(val, gpio_addr + GPIO_SWPORT_DDR);
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return readl(gpio_addr + GPIO_EXT_PORT);
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}
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#endif
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static int gpio_parse_base_address(fdt_addr_t *gpio_base_addr)
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{
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static int initialized;
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ofnode parent, node;
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int idx = 0;
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if (initialized)
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return 0;
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parent = ofnode_path("/pinctrl");
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if (!ofnode_valid(parent)) {
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debug(" - No pinctrl node\n");
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return -EINVAL;
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}
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ofnode_for_each_subnode(node, parent) {
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if (!ofnode_get_property(node, "gpio-controller", NULL)) {
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debug(" - No gpio controller node\n");
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continue;
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}
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gpio_base_addr[idx] = ofnode_get_addr(node);
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debug(" - gpio%d: 0x%x\n", idx, (uint32_t)gpio_base_addr[idx]);
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idx++;
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}
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if (idx == 0) {
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debug(" - parse gpio address failed\n");
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return -EINVAL;
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}
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initialized = 1;
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return 0;
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}
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static void hwid_init_data(void)
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{
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memset(adc_record, 0, sizeof(adc_record));
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memset(gpio_record, 0, sizeof(gpio_record));
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memset(gpio_base_addr, 0, sizeof(gpio_base_addr));
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}
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/*
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* How to use ?
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*
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* 1. Pack dtbs into resource.img, dtb file name:
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* - End with: ".dtb"
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* - Pattern: ...#_[controller]_ch[channel]=[value]...dtb
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* @controller: adc controller name in dts, eg. "saradc", ...;
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* @channel: adc channel;
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* @value: adc value;
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* - Eg: ...#_saradc_ch1=223#_saradc_ch2=650....dtb
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*
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* 2. U-Boot dtsi about adc node:
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* - Add "u-boot,dm-pre-reloc;"
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* - Set node "okay"
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*/
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static int hwid_adc_find_dtb(const char *file_name)
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{
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char *cell_name, *adc_tail, *adc_head, *p;
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int prefix_len, chn_len, len;
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int found = 0, margin = 30;
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int ret, channel;
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char dev_name[32];
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char adc_val[10];
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ulong dtb_adc;
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u32 raw_adc;
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debug("[HW-ADC]: %s\n", file_name);
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chn_len = strlen(KEY_WORDS_ADC_CH);
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prefix_len = strlen(KEY_WORDS_ADC_CTRL);
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cell_name = strstr(file_name, KEY_WORDS_ADC_CTRL);
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while (cell_name) {
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/* Parse adc controller name */
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adc_tail = strstr(cell_name, KEY_WORDS_ADC_CH);
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adc_head = cell_name + prefix_len;
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len = adc_tail - adc_head;
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strlcpy(dev_name, adc_head, len + 1);
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/* Parse adc channel */
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p = adc_tail + chn_len;
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if (is_digit(*p) && is_equal(*(p + 1))) {
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channel = *p - '0';
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} else {
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debug(" - invalid format: %s\n", cell_name);
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return 0;
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}
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/*
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* Read raw adc value
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*
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* It doesn't need to read adc value every loop, reading once
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* is enough. We use adc_record[] to save what we have read, zero
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* means not read before.
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*/
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if (adc_record[channel] == 0) {
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ret = adc_channel_single_shot(dev_name, channel, &raw_adc);
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if (ret) {
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debug(" - failed to read adc, ret=%d\n", ret);
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return 0;
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}
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adc_record[channel] = raw_adc;
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}
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/* Parse dtb adc value */
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p = adc_tail + chn_len + 2; /* 2: channel and '=' */
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while (*p && is_digit(*p)) {
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len++;
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p++;
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}
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strlcpy(adc_val, adc_tail + chn_len + 2, len + 1);
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dtb_adc = simple_strtoul(adc_val, NULL, 10);
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found = (abs(dtb_adc - adc_record[channel]) <= margin) ? 1 : 0;
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debug(" - dev=%s, channel=%d, dtb_adc=%ld, read=%d, found=%d\n",
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dev_name, channel, dtb_adc, adc_record[channel], found);
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if (!found)
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break;
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cell_name = strstr(p, KEY_WORDS_ADC_CTRL);
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}
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return found;
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}
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/*
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* How to use ?
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*
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* 1. Pack dtbs into resource.img, dtb file name:
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* - End with: ".dtb"
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* - Pattern: ...#gpio[pin]=[level]...dtb
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* @pin: gpio name, eg. 0a2 means GPIO0A2
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* @level: gpio level, 0 or 1
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* - Eg: ...#gpio0a6=1#gpio1c2=0....dtb
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*
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* 2. U-Boot dtsi about gpio node:
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* - Add "u-boot,dm-pre-reloc;" for [all] gpio node;
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* - Set all gpio node "disabled" (We just want their property);
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*/
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static int hwid_gpio_find_dtb(const char *file_name)
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{
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uint8_t port, pin, bank, lvl, val;
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char *cell_name, *p;
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int ret, prefix_len;
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int found = 0;
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u32 bit;
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debug("[HW-GPIO]: %s\n", file_name);
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if (gpio_base_addr[0] == 0) {
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ret = gpio_parse_base_address(gpio_base_addr);
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if (ret) {
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debug("[HW-GPIO]: Can't parse gpio base, ret=%d\n", ret);
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return 0;
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}
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}
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prefix_len = strlen(KEY_WORDS_GPIO);
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cell_name = strstr(file_name, KEY_WORDS_GPIO);
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while (cell_name) {
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p = cell_name + prefix_len;
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/* Invalid format ? */
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if (!(is_digit(*(p + 0)) && is_abcd(*(p + 1)) &&
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is_digit(*(p + 2)) && is_equal(*(p + 3)) &&
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is_digit(*(p + 4)))) {
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debug(" - invalid format: %s\n", cell_name);
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return 0;
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}
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/* Read gpio value */
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port = *(p + 0) - '0';
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bank = *(p + 1) - 'a';
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pin = *(p + 2) - '0';
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lvl = *(p + 4) - '0';
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/*
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* It doesn't need to read gpio value every loop, reading once
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* is enough. We use gpio_record[] to save what we have read, zero
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* means not read before.
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*/
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if (gpio_record[port] == 0) {
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if (!gpio_base_addr[port]) {
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debug(" - can't find gpio%d base\n", port);
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return 0;
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}
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gpio_record[port] =
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gpio_read(gpio_base_addr[port], bank, pin);
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}
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/* Verify result */
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bit = bank * 8 + pin;
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val = gpio_record[port] & (1 << bit) ? 1 : 0;
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found = (val == !!lvl) ? 1 : 0;
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debug(" - gpio%d%c%d=%d, read=%d, found=%d\n",
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port, bank + 'a', pin, lvl, val, found);
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if (!found)
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break;
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cell_name = strstr(p, KEY_WORDS_GPIO);
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}
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return found;
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}
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struct resource_file *resource_read_hwid_dtb(void)
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{
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struct resource_file *file;
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struct list_head *node;
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hwid_init_data();
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list_for_each(node, &entry_head) {
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file = list_entry(node, struct resource_file, link);
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if (!strstr(file->name, DTB_SUFFIX))
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continue;
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if (strstr(file->name, KEY_WORDS_ADC_CTRL) &&
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strstr(file->name, KEY_WORDS_ADC_CH) &&
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hwid_adc_find_dtb(file->name)) {
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return file;
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} else if (strstr(file->name, KEY_WORDS_GPIO) &&
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hwid_gpio_find_dtb(file->name)) {
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return file;
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}
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}
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return NULL;
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}
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