Signed-off-by: Jeppe Ledet-Pedersen <jlp@xxxxxxxxxxxx> --- MAINTAINERS | 1 + drivers/misc/eeprom/Kconfig | 12 ++++ drivers/misc/eeprom/Makefile | 1 + drivers/misc/eeprom/fm33256b-fram.c | 110 ++++++++++++++++++++++++++++++++++++ 4 files changed, 124 insertions(+) create mode 100644 drivers/misc/eeprom/fm33256b-fram.c diff --git a/MAINTAINERS b/MAINTAINERS index 87b5023..a8b71d8 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3387,6 +3387,7 @@ M: Jeppe Ledet-Pedersen <jlp@xxxxxxxxxxxx> S: Maintained F: include/linux/mfd/fm33256b.h F: drivers/mfd/fm33256b.c +F: drivers/misc/eeprom/fm33256b-fram.c CYTTSP TOUCHSCREEN DRIVER M: Ferruh Yigit <fery@xxxxxxxxxxx> diff --git a/drivers/misc/eeprom/Kconfig b/drivers/misc/eeprom/Kconfig index cfc493c..2c0c26a3 100644 --- a/drivers/misc/eeprom/Kconfig +++ b/drivers/misc/eeprom/Kconfig @@ -102,4 +102,16 @@ config EEPROM_DIGSY_MTC_CFG If unsure, say N. +config EEPROM_FM33256B + tristate "Cypress FM33256B FRAM support" + depends on MFD_FM33256B + help + This is a driver for the FRAM found in the Cypress FM33256B Processor + Companion. + + The FRAM is exported as a binary sysfs file. + + This driver can also be built as a module. If so, the module + will be called fm33256b-fram. + endmenu diff --git a/drivers/misc/eeprom/Makefile b/drivers/misc/eeprom/Makefile index fc1e81d..f991f0f 100644 --- a/drivers/misc/eeprom/Makefile +++ b/drivers/misc/eeprom/Makefile @@ -5,3 +5,4 @@ obj-$(CONFIG_EEPROM_MAX6875) += max6875.o obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o obj-$(CONFIG_EEPROM_93XX46) += eeprom_93xx46.o obj-$(CONFIG_EEPROM_DIGSY_MTC_CFG) += digsy_mtc_eeprom.o +obj-$(CONFIG_EEPROM_FM33256B) += fm33256b-fram.o diff --git a/drivers/misc/eeprom/fm33256b-fram.c b/drivers/misc/eeprom/fm33256b-fram.c new file mode 100644 index 0000000..fd3c2c9 --- /dev/null +++ b/drivers/misc/eeprom/fm33256b-fram.c @@ -0,0 +1,110 @@ +/* + * Cypress FM33256B Processor Companion FRAM Driver + * + * Copyright (C) 2016 GomSpace ApS + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/mfd/fm33256b.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +static ssize_t fm33256b_fram_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + int ret; + struct device *dev = container_of(kobj, struct device, kobj); + struct fm33256b *fm33256b = dev_get_drvdata(dev->parent); + + ret = regmap_bulk_read(fm33256b->regmap_fram, off, buf, count); + if (ret < 0) + return ret; + + return count; +} + +static ssize_t fm33256b_fram_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + int ret; + struct device *dev = container_of(kobj, struct device, kobj); + struct fm33256b *fm33256b = dev_get_drvdata(dev->parent); + + ret = regmap_bulk_write(fm33256b->regmap_fram, off, buf, count); + if (ret < 0) + return ret; + + return count; +} + +static struct bin_attribute fm33256b_fram_attr = { + .attr = { + .name = "fram", + .mode = S_IWUSR | S_IRUGO, + }, + .size = FM33256B_MAX_FRAM, + .read = fm33256b_fram_read, + .write = fm33256b_fram_write, +}; + +static int fm33256b_fram_probe(struct platform_device *pdev) +{ + int ret; + struct device *dev = &pdev->dev; + struct fm33256b *fm33256b; + + fm33256b = dev_get_drvdata(dev->parent); + + ret = sysfs_create_bin_file(&(dev->kobj), &fm33256b_fram_attr); + if (ret < 0) + return ret; + + return 0; +} + +static int fm33256b_fram_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct fm33256b *fm33256b; + + fm33256b = dev_get_drvdata(dev->parent); + + sysfs_remove_bin_file(&(dev->kobj), &fm33256b_fram_attr); + + return 0; +} + +static const struct of_device_id fm33256b_fram_dt_ids[] = { + { .compatible = "cypress,fm33256b-fram" }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, fm33256b_fram_dt_ids); + +static struct platform_driver fm33256b_fram_driver = { + .driver = { + .name = "fm33256b-fram", + .of_match_table = fm33256b_fram_dt_ids, + }, + .probe = fm33256b_fram_probe, + .remove = fm33256b_fram_remove, +}; +module_platform_driver(fm33256b_fram_driver); + +MODULE_ALIAS("platform:fm33256b-fram"); +MODULE_AUTHOR("Jeppe Ledet-Pedersen <jlp@xxxxxxxxxxxx>"); +MODULE_DESCRIPTION("Cypress FM33256B Processor Companion FRAM Driver"); +MODULE_LICENSE("GPL v2"); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
