mfd: Add Qualcomm PMIC 8921 core driver

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>

mfd: Add Qualcomm PMIC 8921 core driver
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>
Abhijeet Dharmapurikar · Samuel Ortiz
1 parent 1305134e82
Showing 5 changed files with 275 additions and 0 deletions Side-by-side Diff
drivers/mfd/Kconfig
drivers/mfd/Makefile
drivers/mfd/pm8921-core.c
include/linux/mfd/pm8xxx/core.h
include/linux/mfd/pm8xxx/pm8921.h
@@ -691,6 +691,24 @@
 	  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"
@@ -91,4 +91,5 @@
 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
+/*
+ * 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");
+/*
+ * 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
+/*
+ * 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
...	...	@@ -691,6 +691,24 @@
691	691	This MFD driver does the required setup functionalities for
692	692	OMAP USB Host drivers.
693	693
	694	+config MFD_PM8XXX
	695	+ tristate
	696	+
	697	+config MFD_PM8921_CORE
	698	+ tristate "Qualcomm PM8921 PMIC chip"
	699	+ depends on MSM_SSBI
	700	+ select MFD_CORE
	701	+ select MFD_PM8XXX
	702	+ help
	703	+ If you say yes to this option, support will be included for the
	704	+ built-in PM8921 PMIC chip.
	705	+
	706	+ This is required if your board has a PM8921 and uses its features,
	707	+ such as: MPPs, GPIOs, regulators, interrupts, and PWM.
	708	+
	709	+ Say M here if you want to include support for PM8921 chip as a module.
	710	+ This will build a module called "pm8921-core".
	711	+
694	712	endif # MFD_SUPPORT
695	713
696	714	menu "Multimedia Capabilities Port drivers"
...	...	@@ -91,4 +91,5 @@
91	91	obj-$(CONFIG_MFD_WL1273_CORE) += wl1273-core.o
92	92	obj-$(CONFIG_MFD_CS5535) += cs5535-mfd.o
93	93	obj-$(CONFIG_MFD_OMAP_USB_HOST) += omap-usb-host.o
	94	+obj-$(CONFIG_MFD_PM8921_CORE) += pm8921-core.o
	1	+/*
	2	+ * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
	3	+ *
	4	+ * This program is free software; you can redistribute it and/or modify
	5	+ * it under the terms of the GNU General Public License version 2 and
	6	+ * only version 2 as published by the Free Software Foundation.
	7	+ *
	8	+ * This program is distributed in the hope that it will be useful,
	9	+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	+ * GNU General Public License for more details.
	12	+ */
	13	+
	14	+#define pr_fmt(fmt) "%s: " fmt, __func__
	15	+
	16	+#include <linux/kernel.h>
	17	+#include <linux/platform_device.h>
	18	+#include <linux/slab.h>
	19	+#include <linux/msm_ssbi.h>
	20	+#include <linux/mfd/core.h>
	21	+#include <linux/mfd/pm8xxx/pm8921.h>
	22	+#include <linux/mfd/pm8xxx/core.h>
	23	+
	24	+#define REG_HWREV 0x002 /* PMIC4 revision */
	25	+#define REG_HWREV_2 0x0E8 /* PMIC4 revision 2 */
	26	+
	27	+struct pm8921 {
	28	+ struct device *dev;
	29	+};
	30	+
	31	+static int pm8921_readb(const struct device dev, u16 addr, u8 val)
	32	+{
	33	+ const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
	34	+ const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
	35	+
	36	+ return msm_ssbi_read(pmic->dev->parent, addr, val, 1);
	37	+}
	38	+
	39	+static int pm8921_writeb(const struct device *dev, u16 addr, u8 val)
	40	+{
	41	+ const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
	42	+ const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
	43	+
	44	+ return msm_ssbi_write(pmic->dev->parent, addr, &val, 1);
	45	+}
	46	+
	47	+static int pm8921_read_buf(const struct device dev, u16 addr, u8 buf,
	48	+ int cnt)
	49	+{
	50	+ const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
	51	+ const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
	52	+
	53	+ return msm_ssbi_read(pmic->dev->parent, addr, buf, cnt);
	54	+}
	55	+
	56	+static int pm8921_write_buf(const struct device dev, u16 addr, u8 buf,
	57	+ int cnt)
	58	+{
	59	+ const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
	60	+ const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
	61	+
	62	+ return msm_ssbi_write(pmic->dev->parent, addr, buf, cnt);
	63	+}
	64	+
	65	+static struct pm8xxx_drvdata pm8921_drvdata = {
	66	+ .pmic_readb = pm8921_readb,
	67	+ .pmic_writeb = pm8921_writeb,
	68	+ .pmic_read_buf = pm8921_read_buf,
	69	+ .pmic_write_buf = pm8921_write_buf,
	70	+};
	71	+
	72	+static int __devinit pm8921_probe(struct platform_device *pdev)
	73	+{
	74	+ const struct pm8921_platform_data *pdata = pdev->dev.platform_data;
	75	+ struct pm8921 *pmic;
	76	+ int rc;
	77	+ u8 val;
	78	+
	79	+ if (!pdata) {
	80	+ pr_err("missing platform data\n");
	81	+ return -EINVAL;
	82	+ }
	83	+
	84	+ pmic = kzalloc(sizeof(struct pm8921), GFP_KERNEL);
	85	+ if (!pmic) {
	86	+ pr_err("Cannot alloc pm8921 struct\n");
	87	+ return -ENOMEM;
	88	+ }
	89	+
	90	+ /* Read PMIC chip revision */
	91	+ rc = msm_ssbi_read(pdev->dev.parent, REG_HWREV, &val, sizeof(val));
	92	+ if (rc) {
	93	+ pr_err("Failed to read hw rev reg %d:rc=%d\n", REG_HWREV, rc);
	94	+ goto err_read_rev;
	95	+ }
	96	+ pr_info("PMIC revision 1: %02X\n", val);
	97	+
	98	+ /* Read PMIC chip revision 2 */
	99	+ rc = msm_ssbi_read(pdev->dev.parent, REG_HWREV_2, &val, sizeof(val));
	100	+ if (rc) {
	101	+ pr_err("Failed to read hw rev 2 reg %d:rc=%d\n",
	102	+ REG_HWREV_2, rc);
	103	+ goto err_read_rev;
	104	+ }
	105	+ pr_info("PMIC revision 2: %02X\n", val);
	106	+
	107	+ pmic->dev = &pdev->dev;
	108	+ pm8921_drvdata.pm_chip_data = pmic;
	109	+ platform_set_drvdata(pdev, &pm8921_drvdata);
	110	+
	111	+ return 0;
	112	+
	113	+err_read_rev:
	114	+ kfree(pmic);
	115	+ return rc;
	116	+}
	117	+
	118	+static int __devexit pm8921_remove(struct platform_device *pdev)
	119	+{
	120	+ struct pm8xxx_drvdata *drvdata;
	121	+ struct pm8921 *pmic = NULL;
	122	+
	123	+ drvdata = platform_get_drvdata(pdev);
	124	+ if (drvdata)
	125	+ pmic = drvdata->pm_chip_data;
	126	+ if (pmic)
	127	+ mfd_remove_devices(pmic->dev);
	128	+ platform_set_drvdata(pdev, NULL);
	129	+ kfree(pmic);
	130	+
	131	+ return 0;
	132	+}
	133	+
	134	+static struct platform_driver pm8921_driver = {
	135	+ .probe = pm8921_probe,
	136	+ .remove = __devexit_p(pm8921_remove),
	137	+ .driver = {
	138	+ .name = "pm8921-core",
	139	+ .owner = THIS_MODULE,
	140	+ },
	141	+};
	142	+
	143	+static int __init pm8921_init(void)
	144	+{
	145	+ return platform_driver_register(&pm8921_driver);
	146	+}
	147	+subsys_initcall(pm8921_init);
	148	+
	149	+static void __exit pm8921_exit(void)
	150	+{
	151	+ platform_driver_unregister(&pm8921_driver);
	152	+}
	153	+module_exit(pm8921_exit);
	154	+
	155	+MODULE_LICENSE("GPL v2");
	156	+MODULE_DESCRIPTION("PMIC 8921 core driver");
	157	+MODULE_VERSION("1.0");
	158	+MODULE_ALIAS("platform:pm8921-core");