[PATCH v3 7/9] eeprom: qfprom: Add Qualcomm QFPROM support.

[Srinivas Kandagatla]

This patch adds QFPROM support driver which is used by other drivers
like thermal sensor and cpufreq.

On MSM parts there are some efuses (called qfprom) these fuses store things like
calibration data, speed bins.. etc. Drivers like cpufreq, thermal sensors would
read out this data for configuring the driver.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
---
 drivers/eeprom/Kconfig  | 11 +++++++
 drivers/eeprom/Makefile |  2 ++
 drivers/eeprom/qfprom.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 100 insertions(+)
 create mode 100644 drivers/eeprom/qfprom.c

diff --git a/drivers/eeprom/Kconfig b/drivers/eeprom/Kconfig
index ad396c1..8fc14d3 100644
--- a/drivers/eeprom/Kconfig
+++ b/drivers/eeprom/Kconfig
@@ -23,4 +23,15 @@ config EEPROM_SUNXI_SID
 	  This driver can also be built as a module. If so, the module
 	  will be called eeprom-sunxi-sid.
 
+config QCOM_QFPROM
+	tristate "QCOM QFPROM Support"
+	depends on ARCH_QCOM
+	select REGMAP_MMIO
+	help
+	  Say y here to enable QFPROM support. The QFPROM provides access
+	  functions for QFPROM data to rest of the drivers via eeprom interface.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called eeprom-qfprom.
+
 endif
diff --git a/drivers/eeprom/Makefile b/drivers/eeprom/Makefile
index 184aa53..4ac437e 100644
--- a/drivers/eeprom/Makefile
+++ b/drivers/eeprom/Makefile
@@ -8,3 +8,5 @@ eeprom_core-y			:= core.o
 # Devices
 obj-$(CONFIG_EEPROM_SUNXI_SID)	+= eeprom-sunxi-sid.o
 eeprom-sunxi-sid-y		:= sunxi-sid.o
+obj-$(CONFIG_QCOM_QFPROM)	+= eeprom_qfprom.o
+eeprom_qfprom-y			:= qfprom.o
diff --git a/drivers/eeprom/qfprom.c b/drivers/eeprom/qfprom.c
new file mode 100644
index 0000000..8d5d4d8
--- /dev/null
+++ b/drivers/eeprom/qfprom.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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.
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/platform_device.h>
+#include <linux/eeprom-provider.h>
+
+static struct regmap_config qfprom_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 8,
+	.reg_stride = 1,
+};
+
+static struct eeprom_config econfig = {
+	.name = "qfprom",
+};
+
+static int qfprom_remove(struct platform_device *pdev)
+{
+	struct eeprom_device *eeprom = platform_get_drvdata(pdev);
+
+	return eeprom_unregister(eeprom);
+}
+
+static int qfprom_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	void __iomem *base;
+	struct device *dev = &pdev->dev;
+	struct eeprom_device *eeprom;
+	struct regmap *regmap;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	qfprom_regmap_config.max_register = resource_size(res) - 1;
+
+	regmap = devm_regmap_init_mmio(dev, base,
+					       &qfprom_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(dev, "regmap init failed\n");
+		return PTR_ERR(regmap);
+	}
+	econfig.owner = THIS_MODULE;
+	econfig.dev = dev;
+	eeprom = eeprom_register(&econfig);
+	if (IS_ERR(eeprom))
+		return PTR_ERR(eeprom);
+
+	platform_set_drvdata(pdev, eeprom);
+	return 0;
+}
+
+static const struct of_device_id qfprom_of_match[] = {
+	{ .compatible = "qcom,qfprom"},
+	{/* sentinel */},
+};
+MODULE_DEVICE_TABLE(of, qfprom_of_match);
+
+static struct platform_driver qfprom_driver = {
+	.probe = qfprom_probe,
+	.remove = qfprom_remove,
+	.driver = {
+		.name = "qcom,qfprom",
+		.of_match_table = qfprom_of_match,
+	},
+};
+module_platform_driver(qfprom_driver);
+MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla at linaro.org>");
+MODULE_DESCRIPTION("Qualcomm QFPROM driver");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1