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Date: Wed, 20 Apr 2016 13:07:50 +0200
From: Jeppe Ledet-Pedersen <jlp@...space.com>
To: <lee.jones@...aro.org>, <arnd@...db.de>,
<gregkh@...uxfoundation.org>,
<alexandre.belloni@...e-electrons.com>, <a.zummo@...ertech.it>,
<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>
CC: <rtc-linux@...glegroups.com>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
Jeppe Ledet-Pedersen <jlp@...space.com>
Subject: [PATCH 2/3] misc: eeprom: add Cypress FM33256B FRAM driver
Signed-off-by: Jeppe Ledet-Pedersen <jlp@...space.com>
---
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@...space.com>
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@...ress.com>
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@...space.com>");
+MODULE_DESCRIPTION("Cypress FM33256B Processor Companion FRAM Driver");
+MODULE_LICENSE("GPL v2");
--
2.1.4
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