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Subject[PATCH 06/13] mfd: pxa-w1: MFD driver for PXA 1wire control + DS1WM chip
Date
This driver provides registers and IRQ of PXA3xx chips to the ds1wm driver.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
---
drivers/mfd/Kconfig | 7 ++
drivers/mfd/Makefile | 1 +
drivers/mfd/pxa-w1.c | 150 ++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 158 insertions(+), 0 deletions(-)
create mode 100644 drivers/mfd/pxa-w1.c

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index e2fea58..b6ecf90 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -34,6 +34,13 @@ config MFD_88PM860X
select individual components like voltage regulators, RTC and
battery-charger under the corresponding menus.

+config MFD_PXA_DS1WM
+ tristate "Support DS1WM chip on Marvell silicons"
+ select MFD_CORE
+ help
+ This core driver provides register access for PXA_DS1WM.
+ Actual functionality is handled by the ds1wm drivers.
+
config MFD_SM501
tristate "Support for Silicon Motion SM501"
---help---
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 419caa9..4f8d1d2 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -4,6 +4,7 @@

88pm860x-objs := 88pm860x-core.o 88pm860x-i2c.o
obj-$(CONFIG_MFD_88PM860X) += 88pm860x.o
+obj-$(CONFIG_MFD_PXA_DS1WM) += pxa-w1.o
obj-$(CONFIG_MFD_SM501) += sm501.o
obj-$(CONFIG_MFD_ASIC3) += asic3.o tmio_core.o

diff --git a/drivers/mfd/pxa-w1.c b/drivers/mfd/pxa-w1.c
new file mode 100644
index 0000000..98074ff
--- /dev/null
+++ b/drivers/mfd/pxa-w1.c
@@ -0,0 +1,150 @@
+/*
+ * Core driver for PXA DS1WM chip.
+ *
+ * Copyright (C) 2010 Marvell <jtzhou@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/ds1wm.h>
+
+struct pxa_w1_info {
+ struct clk *clk;
+};
+
+static int ds1wm_enable(struct platform_device *pdev)
+{
+ struct device *dev = pdev->dev.parent;
+ struct pxa_w1_info *info = dev_get_drvdata(dev);
+
+ clk_enable(info->clk);
+ dev_dbg(dev, "pxa DS1WM clk (active)\n");
+ return 0;
+}
+
+static int ds1wm_disable(struct platform_device *pdev)
+{
+ struct device *dev = pdev->dev.parent;
+ struct pxa_w1_info *info = dev_get_drvdata(dev);
+
+ clk_disable(info->clk);
+ dev_dbg(dev, "pxa DS1WM clk (in-active)\n");
+ return 0;
+}
+
+static struct resource ds1wm_resources[] __devinitdata = {
+ {0, 0, "ds1wm-mem", IORESOURCE_MEM,},
+ {0, 0, "ds1wm-irq", IORESOURCE_IRQ,},
+};
+
+static struct ds1wm_driver_data ds1wm_pdata;
+
+static struct mfd_cell ds1wm_cell __devinitdata = {
+ .name = "ds1wm",
+ .enable = ds1wm_enable,
+ .disable = ds1wm_disable,
+ .platform_data = &ds1wm_pdata,
+ .pdata_size = sizeof(ds1wm_pdata),
+ .num_resources = ARRAY_SIZE(ds1wm_resources),
+ .resources = ds1wm_resources,
+};
+
+static int __devinit pxa_w1_probe(struct platform_device *pdev)
+{
+ struct ds1wm_driver_data *pdata = pdev->dev.platform_data;
+ struct pxa_w1_info *info;
+ struct resource *r;
+ int ret, irq;
+
+ info = kzalloc(sizeof(struct pxa_w1_info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (r == NULL) {
+ ret = -ENXIO;
+ goto out;
+ }
+ irq = r->start;
+ if (pdata)
+ ds1wm_pdata.active_high = pdata->active_high;
+ if (ds1wm_pdata.active_high)
+ ds1wm_resources[1].flags |= IORESOURCE_IRQ_HIGHEDGE;
+ else
+ ds1wm_resources[1].flags |= IORESOURCE_IRQ_LOWEDGE;
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (r == NULL) {
+ ret = -ENXIO;
+ goto out;
+ }
+ ds1wm_resources[0].end = resource_size(r) - 1;
+
+ info->clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(info->clk)) {
+ ret = PTR_ERR(info->clk);
+ goto out;
+ }
+ platform_set_drvdata(pdev, info);
+
+ ds1wm_pdata.clock_rate = clk_get_rate(info->clk);
+ ret = mfd_add_devices(&pdev->dev, pdev->id, &ds1wm_cell, 1, r, irq);
+ if (ret < 0)
+ dev_err(&pdev->dev, "failed to register pxa DS1WM\n");
+
+ return 0;
+out:
+ kfree(info);
+ return ret;
+}
+
+static int __devexit pxa_w1_remove(struct platform_device *pdev)
+{
+ struct pxa_w1_info *info = platform_get_drvdata(pdev);
+
+ mfd_remove_devices(&pdev->dev);
+ clk_put(info->clk);
+ kfree(info);
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+static struct platform_driver pxa_w1_driver = {
+ .driver = {
+ .name = "pxa3xx-w1",
+ .owner = THIS_MODULE,
+ },
+ .probe = pxa_w1_probe,
+ .remove = __devexit_p(pxa_w1_remove),
+};
+
+static int __init pxa_w1_base_init(void)
+{
+ return platform_driver_register(&pxa_w1_driver);
+}
+
+static void __exit pxa_w1_base_exit(void)
+{
+ platform_driver_unregister(&pxa_w1_driver);
+}
+
+module_init(pxa_w1_base_init);
+module_exit(pxa_w1_base_exit);
+
+MODULE_AUTHOR("Jett Zhou <jtzhou@marvell.com>");
+MODULE_DESCRIPTION("one wire driver for PXA");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pxa-w1");
--
1.5.6.5


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