// SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for most of the SPI EEPROMs, such as Atmel AT25 models * and Cypress FRAMs FM25 models. * * Copyright (C) 2006 David Brownell */ #include <linux/bits.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/property.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/spi/eeprom.h> #include <linux/spi/spi.h> #include <linux/nvmem-provider.h> /* * NOTE: this is an *EEPROM* driver. The vagaries of product naming * mean that some AT25 products are EEPROMs, and others are FLASH. * Handle FLASH chips with the drivers/mtd/devices/m25p80.c driver, * not this one! * * EEPROMs that can be used with this driver include, for example: * AT25M02, AT25128B */ #define FM25_SN_LEN … #define EE_MAXADDRLEN … struct at25_data { … }; #define AT25_WREN … #define AT25_WRDI … #define AT25_RDSR … #define AT25_WRSR … #define AT25_READ … #define AT25_WRITE … #define FM25_SLEEP … #define FM25_RDID … #define FM25_RDSN … #define AT25_SR_nRDY … #define AT25_SR_WEN … #define AT25_SR_BP0 … #define AT25_SR_BP1 … #define AT25_SR_WPEN … #define AT25_INSTR_BIT3 … #define FM25_ID_LEN … /* * Specs often allow 5ms for a page write, sometimes 20ms; * it's important to recover from write timeouts. */ #define EE_TIMEOUT … /*-------------------------------------------------------------------------*/ #define io_limit … static int at25_ee_read(void *priv, unsigned int offset, void *val, size_t count) { … } /* Read extra registers as ID or serial number */ static int fm25_aux_read(struct at25_data *at25, u8 *buf, uint8_t command, int len) { … } static ssize_t sernum_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(sernum); static struct attribute *sernum_attrs[] = …; ATTRIBUTE_GROUPS(…); static int at25_ee_write(void *priv, unsigned int off, void *val, size_t count) { … } /*-------------------------------------------------------------------------*/ static int at25_fw_to_chip(struct device *dev, struct spi_eeprom *chip) { … } static int at25_fram_to_chip(struct device *dev, struct spi_eeprom *chip) { … } static const struct of_device_id at25_of_match[] = …; MODULE_DEVICE_TABLE(of, at25_of_match); static const struct spi_device_id at25_spi_ids[] = …; MODULE_DEVICE_TABLE(spi, at25_spi_ids); static int at25_probe(struct spi_device *spi) { … } /*-------------------------------------------------------------------------*/ static struct spi_driver at25_driver = …; module_spi_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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