Lines Matching full:at25
3 * at25.c -- support most SPI EEPROMs, such as Atmel AT25 models
22 * mean that some AT25 products are EEPROMs, and others are FLASH.
65 struct at25_data *at25 = priv; in at25_ee_read() local
74 if (unlikely(offset >= at25->chip.byte_len)) in at25_ee_read()
76 if ((offset + count) > at25->chip.byte_len) in at25_ee_read()
77 count = at25->chip.byte_len - offset; in at25_ee_read()
84 if (at25->chip.flags & EE_INSTR_BIT3_IS_ADDR) in at25_ee_read()
85 if (offset >= (1U << (at25->addrlen * 8))) in at25_ee_read()
90 switch (at25->addrlen) { in at25_ee_read()
106 t[0].len = at25->addrlen + 1; in at25_ee_read()
113 mutex_lock(&at25->lock); in at25_ee_read()
121 status = spi_sync(at25->spi, &m); in at25_ee_read()
122 dev_dbg(&at25->spi->dev, "read %zu bytes at %d --> %zd\n", in at25_ee_read()
125 mutex_unlock(&at25->lock); in at25_ee_read()
131 struct at25_data *at25 = priv; in at25_ee_write() local
137 if (unlikely(off >= at25->chip.byte_len)) in at25_ee_write()
139 if ((off + count) > at25->chip.byte_len) in at25_ee_write()
140 count = at25->chip.byte_len - off; in at25_ee_write()
145 buf_size = at25->chip.page_size; in at25_ee_write()
148 bounce = kmalloc(buf_size + at25->addrlen + 1, GFP_KERNEL); in at25_ee_write()
155 mutex_lock(&at25->lock); in at25_ee_write()
165 status = spi_write(at25->spi, cp, 1); in at25_ee_write()
167 dev_dbg(&at25->spi->dev, "WREN --> %d\n", status); in at25_ee_write()
172 if (at25->chip.flags & EE_INSTR_BIT3_IS_ADDR) in at25_ee_write()
173 if (offset >= (1U << (at25->addrlen * 8))) in at25_ee_write()
178 switch (at25->addrlen) { in at25_ee_write()
195 status = spi_write(at25->spi, bounce, in at25_ee_write()
196 segment + at25->addrlen + 1); in at25_ee_write()
197 dev_dbg(&at25->spi->dev, "write %u bytes at %u --> %d\n", in at25_ee_write()
211 sr = spi_w8r8(at25->spi, AT25_RDSR); in at25_ee_write()
213 dev_dbg(&at25->spi->dev, in at25_ee_write()
224 dev_err(&at25->spi->dev, in at25_ee_write()
239 mutex_unlock(&at25->lock); in at25_ee_write()
252 strncpy(chip->name, "at25", sizeof(chip->name)); in at25_fw_to_chip()
255 device_property_read_u32(dev, "at25,byte-len", &val) == 0) { in at25_fw_to_chip()
263 device_property_read_u32(dev, "at25,page-size", &val) == 0) { in at25_fw_to_chip()
270 if (device_property_read_u32(dev, "at25,addr-mode", &val) == 0) { in at25_fw_to_chip()
305 struct at25_data *at25 = NULL; in at25_probe() local
341 at25 = devm_kzalloc(&spi->dev, sizeof(struct at25_data), GFP_KERNEL); in at25_probe()
342 if (!at25) in at25_probe()
345 mutex_init(&at25->lock); in at25_probe()
346 at25->chip = chip; in at25_probe()
347 at25->spi = spi; in at25_probe()
348 spi_set_drvdata(spi, at25); in at25_probe()
349 at25->addrlen = addrlen; in at25_probe()
351 at25->nvmem_config.type = NVMEM_TYPE_EEPROM; in at25_probe()
352 at25->nvmem_config.name = dev_name(&spi->dev); in at25_probe()
353 at25->nvmem_config.dev = &spi->dev; in at25_probe()
354 at25->nvmem_config.read_only = chip.flags & EE_READONLY; in at25_probe()
355 at25->nvmem_config.root_only = true; in at25_probe()
356 at25->nvmem_config.owner = THIS_MODULE; in at25_probe()
357 at25->nvmem_config.compat = true; in at25_probe()
358 at25->nvmem_config.base_dev = &spi->dev; in at25_probe()
359 at25->nvmem_config.reg_read = at25_ee_read; in at25_probe()
360 at25->nvmem_config.reg_write = at25_ee_write; in at25_probe()
361 at25->nvmem_config.priv = at25; in at25_probe()
362 at25->nvmem_config.stride = 1; in at25_probe()
363 at25->nvmem_config.word_size = 1; in at25_probe()
364 at25->nvmem_config.size = chip.byte_len; in at25_probe()
366 at25->nvmem = devm_nvmem_register(&spi->dev, &at25->nvmem_config); in at25_probe()
367 if (IS_ERR(at25->nvmem)) in at25_probe()
368 return PTR_ERR(at25->nvmem); in at25_probe()
373 at25->chip.name, in at25_probe()
375 at25->chip.page_size); in at25_probe()
382 { .compatible = "atmel,at25", },
389 .name = "at25",
400 MODULE_ALIAS("spi:at25");