[deliverable/linux.git] / drivers / mfd / pm8921-core.c

/*
 * 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/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/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;
	struct pm_irq_chip		*irq_chip;
};

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 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 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 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 ssbi_write(pmic->dev->parent, addr, buf, cnt);
}

static int pm8921_read_irq_stat(const struct device *dev, int irq)
{
	const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
	const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;

	return pm8xxx_get_irq_stat(pmic->irq_chip, irq);
}

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,
	.pmic_read_irq_stat	= pm8921_read_irq_stat,
};

static int pm8921_add_subdevices(const struct pm8921_platform_data
					   *pdata,
					   struct pm8921 *pmic,
					   u32 rev)
{
	int ret = 0, irq_base = 0;
	struct pm_irq_chip *irq_chip;

	if (pdata->irq_pdata) {
		pdata->irq_pdata->irq_cdata.nirqs = PM8921_NR_IRQS;
		pdata->irq_pdata->irq_cdata.rev = rev;
		irq_base = pdata->irq_pdata->irq_base;
		irq_chip = pm8xxx_irq_init(pmic->dev, pdata->irq_pdata);

		if (IS_ERR(irq_chip)) {
			pr_err("Failed to init interrupts ret=%ld\n",
					PTR_ERR(irq_chip));
			return PTR_ERR(irq_chip);
		}
		pmic->irq_chip = irq_chip;
	}
	return ret;
}

static int pm8921_probe(struct platform_device *pdev)
{
	const struct pm8921_platform_data *pdata = dev_get_platdata(&pdev->dev);
	struct pm8921 *pmic;
	int rc;
	u8 val;
	u32 rev;

	if (!pdata) {
		pr_err("missing platform data\n");
		return -EINVAL;
	}

	pmic = devm_kzalloc(&pdev->dev, sizeof(struct pm8921), GFP_KERNEL);
	if (!pmic) {
		pr_err("Cannot alloc pm8921 struct\n");
		return -ENOMEM;
	}

	/* Read PMIC chip revision */
	rc = 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);
		return rc;
	}
	pr_info("PMIC revision 1: %02X\n", val);
	rev = val;

	/* Read PMIC chip revision 2 */
	rc = 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);
		return rc;
	}
	pr_info("PMIC revision 2: %02X\n", val);
	rev |= val << BITS_PER_BYTE;

	pmic->dev = &pdev->dev;
	pm8921_drvdata.pm_chip_data = pmic;
	platform_set_drvdata(pdev, &pm8921_drvdata);

	rc = pm8921_add_subdevices(pdata, pmic, rev);
	if (rc) {
		pr_err("Cannot add subdevices rc=%d\n", rc);
		goto err;
	}

	/* gpio might not work if no irq device is found */
	WARN_ON(pmic->irq_chip == NULL);

	return 0;

err:
	mfd_remove_devices(pmic->dev);
	return rc;
}

static int 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);
	if (pmic->irq_chip) {
		pm8xxx_irq_exit(pmic->irq_chip);
		pmic->irq_chip = NULL;
	}

	return 0;
}

static struct platform_driver pm8921_driver = {
	.probe		= pm8921_probe,
	.remove		= 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");
Commit	Line	Data
cbdb53e1 AD	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>
ef310f4b	17	#include <linux/module.h>
cbdb53e1 AD	18	#include <linux/platform_device.h>
cbdb53e1 AD	19	#include <linux/slab.h>
c013f0a5	20	#include <linux/err.h>
ce44bf5b	21	#include <linux/ssbi.h>
cbdb53e1 AD	22	#include <linux/mfd/core.h>
	23	#include <linux/mfd/pm8xxx/pm8921.h>
	24	#include <linux/mfd/pm8xxx/core.h>
	25
	26	#define REG_HWREV 0x002 /* PMIC4 revision */
	27	#define REG_HWREV_2 0x0E8 /* PMIC4 revision 2 */
	28
	29	struct pm8921 {
	30	struct device *dev;
c013f0a5	31	struct pm_irq_chip *irq_chip;
cbdb53e1 AD	32	};
	33
	34	static int pm8921_readb(const struct device dev, u16 addr, u8 val)
	35	{
	36	const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
	37	const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
	38
ce44bf5b	39	return ssbi_read(pmic->dev->parent, addr, val, 1);
cbdb53e1 AD	40	}
	41
	42	static int pm8921_writeb(const struct device *dev, u16 addr, u8 val)
	43	{
	44	const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
	45	const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
	46
ce44bf5b	47	return ssbi_write(pmic->dev->parent, addr, &val, 1);
cbdb53e1 AD	48	}
	49
	50	static int pm8921_read_buf(const struct device dev, u16 addr, u8 buf,
	51	int cnt)
	52	{
	53	const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
	54	const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
	55
ce44bf5b	56	return ssbi_read(pmic->dev->parent, addr, buf, cnt);
cbdb53e1 AD	57	}
	58
	59	static int pm8921_write_buf(const struct device dev, u16 addr, u8 buf,
	60	int cnt)
	61	{
	62	const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
	63	const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
	64
ce44bf5b	65	return ssbi_write(pmic->dev->parent, addr, buf, cnt);
cbdb53e1 AD	66	}
cbdb53e1 AD	67
c013f0a5 AD	68	static int pm8921_read_irq_stat(const struct device *dev, int irq)
	69	{
	70	const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
	71	const struct pm8921 *pmic = pm8921_drvdata->pm_chip_data;
	72
	73	return pm8xxx_get_irq_stat(pmic->irq_chip, irq);
	74	}
	75
cbdb53e1 AD	76	static struct pm8xxx_drvdata pm8921_drvdata = {
	77	.pmic_readb = pm8921_readb,
	78	.pmic_writeb = pm8921_writeb,
	79	.pmic_read_buf = pm8921_read_buf,
	80	.pmic_write_buf = pm8921_write_buf,
c013f0a5	81	.pmic_read_irq_stat = pm8921_read_irq_stat,
cbdb53e1 AD	82	};
cbdb53e1 AD	83
f791be49	84	static int pm8921_add_subdevices(const struct pm8921_platform_data
c013f0a5 AD	85	*pdata,
	86	struct pm8921 *pmic,
	87	u32 rev)
	88	{
	89	int ret = 0, irq_base = 0;
	90	struct pm_irq_chip *irq_chip;
	91
	92	if (pdata->irq_pdata) {
	93	pdata->irq_pdata->irq_cdata.nirqs = PM8921_NR_IRQS;
	94	pdata->irq_pdata->irq_cdata.rev = rev;
	95	irq_base = pdata->irq_pdata->irq_base;
	96	irq_chip = pm8xxx_irq_init(pmic->dev, pdata->irq_pdata);
	97
	98	if (IS_ERR(irq_chip)) {
	99	pr_err("Failed to init interrupts ret=%ld\n",
	100	PTR_ERR(irq_chip));
	101	return PTR_ERR(irq_chip);
	102	}
	103	pmic->irq_chip = irq_chip;
	104	}
	105	return ret;
	106	}
	107
f791be49	108	static int pm8921_probe(struct platform_device *pdev)
cbdb53e1	109	{
334a41ce	110	const struct pm8921_platform_data *pdata = dev_get_platdata(&pdev->dev);
cbdb53e1 AD	111	struct pm8921 *pmic;
	112	int rc;
	113	u8 val;
c013f0a5	114	u32 rev;
cbdb53e1 AD	115
	116	if (!pdata) {
	117	pr_err("missing platform data\n");
	118	return -EINVAL;
	119	}
	120
b2cdcfac	121	pmic = devm_kzalloc(&pdev->dev, sizeof(struct pm8921), GFP_KERNEL);
cbdb53e1 AD	122	if (!pmic) {
	123	pr_err("Cannot alloc pm8921 struct\n");
	124	return -ENOMEM;
	125	}
	126
	127	/* Read PMIC chip revision */
ce44bf5b	128	rc = ssbi_read(pdev->dev.parent, REG_HWREV, &val, sizeof(val));
cbdb53e1 AD	129	if (rc) {
cbdb53e1 AD	130	pr_err("Failed to read hw rev reg %d:rc=%d\n", REG_HWREV, rc);
b2cdcfac	131	return rc;
cbdb53e1 AD	132	}
cbdb53e1 AD	133	pr_info("PMIC revision 1: %02X\n", val);
c013f0a5	134	rev = val;
cbdb53e1 AD	135
cbdb53e1 AD	136	/* Read PMIC chip revision 2 */
ce44bf5b	137	rc = ssbi_read(pdev->dev.parent, REG_HWREV_2, &val, sizeof(val));
cbdb53e1 AD	138	if (rc) {
	139	pr_err("Failed to read hw rev 2 reg %d:rc=%d\n",
	140	REG_HWREV_2, rc);
b2cdcfac	141	return rc;
cbdb53e1 AD	142	}
cbdb53e1 AD	143	pr_info("PMIC revision 2: %02X\n", val);
c013f0a5	144	rev \|= val << BITS_PER_BYTE;
cbdb53e1 AD	145
	146	pmic->dev = &pdev->dev;
	147	pm8921_drvdata.pm_chip_data = pmic;
	148	platform_set_drvdata(pdev, &pm8921_drvdata);
	149
c013f0a5 AD	150	rc = pm8921_add_subdevices(pdata, pmic, rev);
	151	if (rc) {
	152	pr_err("Cannot add subdevices rc=%d\n", rc);
	153	goto err;
	154	}
	155
	156	/* gpio might not work if no irq device is found */
	157	WARN_ON(pmic->irq_chip == NULL);
	158
cbdb53e1 AD	159	return 0;
cbdb53e1 AD	160
c013f0a5 AD	161	err:
c013f0a5 AD	162	mfd_remove_devices(pmic->dev);
cbdb53e1 AD	163	return rc;
	164	}
	165
4740f73f	166	static int pm8921_remove(struct platform_device *pdev)
cbdb53e1 AD	167	{
	168	struct pm8xxx_drvdata *drvdata;
	169	struct pm8921 *pmic = NULL;
	170
	171	drvdata = platform_get_drvdata(pdev);
	172	if (drvdata)
	173	pmic = drvdata->pm_chip_data;
	174	if (pmic)
	175	mfd_remove_devices(pmic->dev);
c013f0a5 AD	176	if (pmic->irq_chip) {
	177	pm8xxx_irq_exit(pmic->irq_chip);
	178	pmic->irq_chip = NULL;
	179	}
cbdb53e1 AD	180
	181	return 0;
	182	}
	183
	184	static struct platform_driver pm8921_driver = {
	185	.probe = pm8921_probe,
84449216	186	.remove = pm8921_remove,
cbdb53e1 AD	187	.driver = {
	188	.name = "pm8921-core",
	189	.owner = THIS_MODULE,
	190	},
	191	};
	192
	193	static int __init pm8921_init(void)
	194	{
	195	return platform_driver_register(&pm8921_driver);
	196	}
	197	subsys_initcall(pm8921_init);
	198
	199	static void __exit pm8921_exit(void)
	200	{
	201	platform_driver_unregister(&pm8921_driver);
	202	}
	203	module_exit(pm8921_exit);
	204
	205	MODULE_LICENSE("GPL v2");
	206	MODULE_DESCRIPTION("PMIC 8921 core driver");
	207	MODULE_VERSION("1.0");
	208	MODULE_ALIAS("platform:pm8921-core");