mfd: Add Qualcomm PMIC 8921 core driver
Abhijeet Dharmapurikar [Tue, 5 Apr 2011 21:40:52 +0000 (14:40 -0700)]
Add support for the Qualcomm PM8921 PMIC chip. The core driver
will communicate with the PMIC chip via the MSM SSBI bus.

Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/Kconfig
drivers/mfd/Makefile
drivers/mfd/pm8921-core.c [new file with mode: 0644]
include/linux/mfd/pm8xxx/core.h [new file with mode: 0644]
include/linux/mfd/pm8xxx/pm8921.h [new file with mode: 0644]

index ec2da83..d423288 100644 (file)
@@ -691,6 +691,24 @@ config MFD_OMAP_USB_HOST
          This MFD driver does the required setup functionalities for
          OMAP USB Host drivers.
 
+config MFD_PM8XXX
+       tristate
+
+config MFD_PM8921_CORE
+       tristate "Qualcomm PM8921 PMIC chip"
+       depends on MSM_SSBI
+       select MFD_CORE
+       select MFD_PM8XXX
+       help
+         If you say yes to this option, support will be included for the
+         built-in PM8921 PMIC chip.
+
+         This is required if your board has a PM8921 and uses its features,
+         such as: MPPs, GPIOs, regulators, interrupts, and PWM.
+
+         Say M here if you want to include support for PM8921 chip as a module.
+         This will build a module called "pm8921-core".
+
 endif # MFD_SUPPORT
 
 menu "Multimedia Capabilities Port drivers"
index 24aa444..d32a7b8 100644 (file)
@@ -91,3 +91,4 @@ obj-$(CONFIG_MFD_VX855)               += vx855.o
 obj-$(CONFIG_MFD_WL1273_CORE)  += wl1273-core.o
 obj-$(CONFIG_MFD_CS5535)       += cs5535-mfd.o
 obj-$(CONFIG_MFD_OMAP_USB_HOST)        += omap-usb-host.o
+obj-$(CONFIG_MFD_PM8921_CORE)  += pm8921-core.o
diff --git a/drivers/mfd/pm8921-core.c b/drivers/mfd/pm8921-core.c
new file mode 100644 (file)
index 0000000..a2ecd32
--- /dev/null
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/msm_ssbi.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/pm8xxx/pm8921.h>
+#include <linux/mfd/pm8xxx/core.h>
+
+#define REG_HWREV              0x002  /* PMIC4 revision */
+#define REG_HWREV_2            0x0E8  /* PMIC4 revision 2 */
+
+struct pm8921 {
+       struct device                   *dev;
+};
+
+static int pm8921_readb(const struct device *dev, u16 addr, u8 *val)
+{
+       const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
+       const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
+
+       return msm_ssbi_read(pmic->dev->parent, addr, val, 1);
+}
+
+static int pm8921_writeb(const struct device *dev, u16 addr, u8 val)
+{
+       const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
+       const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
+
+       return msm_ssbi_write(pmic->dev->parent, addr, &val, 1);
+}
+
+static int pm8921_read_buf(const struct device *dev, u16 addr, u8 *buf,
+                                                                       int cnt)
+{
+       const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
+       const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
+
+       return msm_ssbi_read(pmic->dev->parent, addr, buf, cnt);
+}
+
+static int pm8921_write_buf(const struct device *dev, u16 addr, u8 *buf,
+                                                                       int cnt)
+{
+       const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
+       const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
+
+       return msm_ssbi_write(pmic->dev->parent, addr, buf, cnt);
+}
+
+static struct pm8xxx_drvdata pm8921_drvdata = {
+       .pmic_readb             = pm8921_readb,
+       .pmic_writeb            = pm8921_writeb,
+       .pmic_read_buf          = pm8921_read_buf,
+       .pmic_write_buf         = pm8921_write_buf,
+};
+
+static int __devinit pm8921_probe(struct platform_device *pdev)
+{
+       const struct pm8921_platform_data *pdata = pdev->dev.platform_data;
+       struct pm8921 *pmic;
+       int rc;
+       u8 val;
+
+       if (!pdata) {
+               pr_err("missing platform data\n");
+               return -EINVAL;
+       }
+
+       pmic = kzalloc(sizeof(struct pm8921), GFP_KERNEL);
+       if (!pmic) {
+               pr_err("Cannot alloc pm8921 struct\n");
+               return -ENOMEM;
+       }
+
+       /* Read PMIC chip revision */
+       rc = msm_ssbi_read(pdev->dev.parent, REG_HWREV, &val, sizeof(val));
+       if (rc) {
+               pr_err("Failed to read hw rev reg %d:rc=%d\n", REG_HWREV, rc);
+               goto err_read_rev;
+       }
+       pr_info("PMIC revision 1: %02X\n", val);
+
+       /* Read PMIC chip revision 2 */
+       rc = msm_ssbi_read(pdev->dev.parent, REG_HWREV_2, &val, sizeof(val));
+       if (rc) {
+               pr_err("Failed to read hw rev 2 reg %d:rc=%d\n",
+                       REG_HWREV_2, rc);
+               goto err_read_rev;
+       }
+       pr_info("PMIC revision 2: %02X\n", val);
+
+       pmic->dev = &pdev->dev;
+       pm8921_drvdata.pm_chip_data = pmic;
+       platform_set_drvdata(pdev, &pm8921_drvdata);
+
+       return 0;
+
+err_read_rev:
+       kfree(pmic);
+       return rc;
+}
+
+static int __devexit pm8921_remove(struct platform_device *pdev)
+{
+       struct pm8xxx_drvdata *drvdata;
+       struct pm8921 *pmic = NULL;
+
+       drvdata = platform_get_drvdata(pdev);
+       if (drvdata)
+               pmic = drvdata->pm_chip_data;
+       if (pmic)
+               mfd_remove_devices(pmic->dev);
+       platform_set_drvdata(pdev, NULL);
+       kfree(pmic);
+
+       return 0;
+}
+
+static struct platform_driver pm8921_driver = {
+       .probe          = pm8921_probe,
+       .remove         = __devexit_p(pm8921_remove),
+       .driver         = {
+               .name   = "pm8921-core",
+               .owner  = THIS_MODULE,
+       },
+};
+
+static int __init pm8921_init(void)
+{
+       return platform_driver_register(&pm8921_driver);
+}
+subsys_initcall(pm8921_init);
+
+static void __exit pm8921_exit(void)
+{
+       platform_driver_unregister(&pm8921_driver);
+}
+module_exit(pm8921_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("PMIC 8921 core driver");
+MODULE_VERSION("1.0");
+MODULE_ALIAS("platform:pm8921-core");
diff --git a/include/linux/mfd/pm8xxx/core.h b/include/linux/mfd/pm8xxx/core.h
new file mode 100644 (file)
index 0000000..36ccb33
--- /dev/null
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
+ *
+ * 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.
+ */
+/*
+ * Qualcomm PMIC 8xxx driver header file
+ *
+ */
+
+#ifndef __MFD_PM8XXX_CORE_H
+#define __MFD_PM8XXX_CORE_H
+
+#include <linux/mfd/core.h>
+
+struct pm8xxx_drvdata {
+       int     (*pmic_readb) (const struct device *dev, u16 addr, u8 *val);
+       int     (*pmic_writeb) (const struct device *dev, u16 addr, u8 val);
+       int     (*pmic_read_buf) (const struct device *dev, u16 addr, u8 *buf,
+                                                                       int n);
+       int     (*pmic_write_buf) (const struct device *dev, u16 addr, u8 *buf,
+                                                                       int n);
+       void    *pm_chip_data;
+};
+
+static inline int pm8xxx_readb(const struct device *dev, u16 addr, u8 *val)
+{
+       struct pm8xxx_drvdata *dd = dev_get_drvdata(dev);
+
+       if (!dd)
+               return -EINVAL;
+       return dd->pmic_readb(dev, addr, val);
+}
+
+static inline int pm8xxx_writeb(const struct device *dev, u16 addr, u8 val)
+{
+       struct pm8xxx_drvdata *dd = dev_get_drvdata(dev);
+
+       if (!dd)
+               return -EINVAL;
+       return dd->pmic_writeb(dev, addr, val);
+}
+
+static inline int pm8xxx_read_buf(const struct device *dev, u16 addr, u8 *buf,
+                                                                       int n)
+{
+       struct pm8xxx_drvdata *dd = dev_get_drvdata(dev);
+
+       if (!dd)
+               return -EINVAL;
+       return dd->pmic_read_buf(dev, addr, buf, n);
+}
+
+static inline int pm8xxx_write_buf(const struct device *dev, u16 addr, u8 *buf,
+                                                                       int n)
+{
+       struct pm8xxx_drvdata *dd = dev_get_drvdata(dev);
+
+       if (!dd)
+               return -EINVAL;
+       return dd->pmic_write_buf(dev, addr, buf, n);
+}
+
+#endif
diff --git a/include/linux/mfd/pm8xxx/pm8921.h b/include/linux/mfd/pm8xxx/pm8921.h
new file mode 100644 (file)
index 0000000..33fbe9c
--- /dev/null
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
+ *
+ * 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.
+ */
+/*
+ * Qualcomm PMIC 8921 driver header file
+ *
+ */
+
+#ifndef __MFD_PM8921_H
+#define __MFD_PM8921_H
+
+#include <linux/device.h>
+
+struct pm8921_platform_data {
+       int                                     irq_base;
+};
+
+#endif