[mirror_ubuntu-focal-kernel.git] / drivers / mfd / htc-pasic3.c

/*
 * Core driver for HTC PASIC3 LED/DS1WM chip.
 *
 * Copyright (C) 2006 Philipp Zabel <philipp.zabel@gmail.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/platform_device.h>

#include <linux/ds1wm.h>
#include <linux/gpio.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/mfd/htc-pasic3.h>

struct pasic3_data {
	void __iomem *mapping;
	unsigned int bus_shift;
	struct platform_device *ds1wm_pdev;
	struct platform_device *led_pdev;
};

#define REG_ADDR  5
#define REG_DATA  6

#define READ_MODE 0x80

/*
 * write to a secondary register on the PASIC3
 */
void pasic3_write_register(struct device *dev, u32 reg, u8 val)
{
	struct pasic3_data *asic = dev->driver_data;
	int bus_shift = asic->bus_shift;
	void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
	void __iomem *data = asic->mapping + (REG_DATA << bus_shift);

	__raw_writeb(~READ_MODE & reg, addr);
	__raw_writeb(val, data);
}
EXPORT_SYMBOL(pasic3_write_register); /* for leds-pasic3 */

/*
 * read from a secondary register on the PASIC3
 */
u8 pasic3_read_register(struct device *dev, u32 reg)
{
	struct pasic3_data *asic = dev->driver_data;
	int bus_shift = asic->bus_shift;
	void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
	void __iomem *data = asic->mapping + (REG_DATA << bus_shift);

	__raw_writeb(READ_MODE | reg, addr);
	return __raw_readb(data);
}
EXPORT_SYMBOL(pasic3_read_register); /* for leds-pasic3 */

/*
 * LEDs
 */

static int led_device_add(struct device *pasic3_dev,
				const struct pasic3_leds_machinfo *pdata)
{
	struct pasic3_data *asic = pasic3_dev->driver_data;
	struct platform_device *pdev;
	int ret;

	pdev = platform_device_alloc("pasic3-led", -1);
	if (!pdev) {
		dev_dbg(pasic3_dev, "failed to allocate LED platform device\n");
		return -ENOMEM;
	}

	ret = platform_device_add_data(pdev, pdata,
					sizeof(struct pasic3_leds_machinfo));
	if (ret < 0) {
		dev_dbg(pasic3_dev, "failed to add LED platform data\n");
		goto exit_pdev_put;
	}

	pdev->dev.parent = pasic3_dev;
	ret = platform_device_add(pdev);
	if (ret < 0) {
		dev_dbg(pasic3_dev, "failed to add LED platform device\n");
		goto exit_pdev_put;
	}

	asic->led_pdev = pdev;
	return 0;

exit_pdev_put:
	platform_device_put(pdev);
	return ret;
}

/*
 * DS1WM
 */

static void ds1wm_enable(struct platform_device *pdev)
{
	struct device *dev = pdev->dev.parent;
	int c;

	c = pasic3_read_register(dev, 0x28);
	pasic3_write_register(dev, 0x28, c & 0x7f);

	dev_dbg(dev, "DS1WM OWM_EN low (active) %02x\n", c & 0x7f);
}

static void ds1wm_disable(struct platform_device *pdev)
{
	struct device *dev = pdev->dev.parent;
	int c;

	c = pasic3_read_register(dev, 0x28);
	pasic3_write_register(dev, 0x28, c | 0x80);

	dev_dbg(dev, "DS1WM OWM_EN high (inactive) %02x\n", c | 0x80);
}

static struct ds1wm_platform_data ds1wm_pdata = {
	.bus_shift = 2,
	.enable    = ds1wm_enable,
	.disable   = ds1wm_disable,
};

static int ds1wm_device_add(struct platform_device *pasic3_pdev, int bus_shift)
{
	struct device *pasic3_dev = &pasic3_pdev->dev;
	struct pasic3_data *asic = pasic3_dev->driver_data;
	struct platform_device *pdev;
	int ret;

	pdev = platform_device_alloc("ds1wm", -1);
	if (!pdev) {
		dev_dbg(pasic3_dev, "failed to allocate DS1WM platform device\n");
		return -ENOMEM;
	}

	ret = platform_device_add_resources(pdev, pasic3_pdev->resource,
						pasic3_pdev->num_resources);
	if (ret < 0) {
		dev_dbg(pasic3_dev, "failed to add DS1WM resources\n");
		goto exit_pdev_put;
	}

	ds1wm_pdata.bus_shift = asic->bus_shift;
	ret = platform_device_add_data(pdev, &ds1wm_pdata,
					sizeof(struct ds1wm_platform_data));
	if (ret < 0) {
		dev_dbg(pasic3_dev, "failed to add DS1WM platform data\n");
		goto exit_pdev_put;
	}

	pdev->dev.parent = pasic3_dev;
	ret = platform_device_add(pdev);
	if (ret < 0) {
		dev_dbg(pasic3_dev, "failed to add DS1WM platform device\n");
		goto exit_pdev_put;
	}

	asic->ds1wm_pdev = pdev;
	return 0;

exit_pdev_put:
	platform_device_put(pdev);
	return ret;
}

static int __init pasic3_probe(struct platform_device *pdev)
{
	struct pasic3_platform_data *pdata = pdev->dev.platform_data;
	struct device *dev = &pdev->dev;
	struct pasic3_data *asic;
	struct resource *r;
	int ret;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!r)
		return -ENXIO;

	if (!request_mem_region(r->start, r->end - r->start + 1, "pasic3"))
		return -EBUSY;

	asic = kzalloc(sizeof(struct pasic3_data), GFP_KERNEL);
	if (!asic)
		return -ENOMEM;

	platform_set_drvdata(pdev, asic);

	if (pdata && pdata->bus_shift)
		asic->bus_shift = pdata->bus_shift;
	else
		asic->bus_shift = 2;

	asic->mapping = ioremap(r->start, r->end - r->start + 1);
	if (!asic->mapping) {
		dev_err(dev, "couldn't ioremap PASIC3\n");
		kfree(asic);
		return -ENOMEM;
	}

	ret = ds1wm_device_add(pdev, asic->bus_shift);
	if (ret < 0)
		dev_warn(dev, "failed to register DS1WM\n");

	if (pdata->led_pdata) {
		ret = led_device_add(dev, pdata->led_pdata);
		if (ret < 0)
			dev_warn(dev, "failed to register LED device\n");
	}

	return 0;
}

static int pasic3_remove(struct platform_device *pdev)
{
	struct pasic3_data *asic = platform_get_drvdata(pdev);
	struct resource *r;

	if (asic->led_pdev)
		platform_device_unregister(asic->led_pdev);
	if (asic->ds1wm_pdev)
		platform_device_unregister(asic->ds1wm_pdev);

	iounmap(asic->mapping);
	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(r->start, r->end - r->start + 1);
	kfree(asic);
	return 0;
}

MODULE_ALIAS("platform:pasic3");

static struct platform_driver pasic3_driver = {
	.driver		= {
		.name	= "pasic3",
	},
	.remove		= pasic3_remove,
};

static int __init pasic3_base_init(void)
{
	return platform_driver_probe(&pasic3_driver, pasic3_probe);
}

static void __exit pasic3_base_exit(void)
{
	platform_driver_unregister(&pasic3_driver);
}

module_init(pasic3_base_init);
module_exit(pasic3_base_exit);

MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
MODULE_DESCRIPTION("Core driver for HTC PASIC3");
MODULE_LICENSE("GPL");
Commit	Line	Data
5dc3339a PZ	1	/*
	2	* Core driver for HTC PASIC3 LED/DS1WM chip.
	3	*
	4	* Copyright (C) 2006 Philipp Zabel <philipp.zabel@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; version 2 of the License.
	9	*/
	10
	11	#include <linux/init.h>
	12	#include <linux/module.h>
	13	#include <linux/platform_device.h>
	14
	15	#include <linux/ds1wm.h>
	16	#include <linux/gpio.h>
	17	#include <linux/io.h>
	18	#include <linux/irq.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/mfd/htc-pasic3.h>
	21
5dc3339a PZ	22	struct pasic3_data {
	23	void __iomem *mapping;
	24	unsigned int bus_shift;
	25	struct platform_device *ds1wm_pdev;
	26	struct platform_device *led_pdev;
	27	};
	28
	29	#define REG_ADDR 5
	30	#define REG_DATA 6
5dc3339a PZ	31
	32	#define READ_MODE 0x80
	33
	34	/*
	35	* write to a secondary register on the PASIC3
	36	*/
	37	void pasic3_write_register(struct device *dev, u32 reg, u8 val)
	38	{
	39	struct pasic3_data *asic = dev->driver_data;
	40	int bus_shift = asic->bus_shift;
	41	void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
	42	void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
	43
	44	__raw_writeb(~READ_MODE & reg, addr);
	45	__raw_writeb(val, data);
	46	}
	47	EXPORT_SYMBOL(pasic3_write_register); /* for leds-pasic3 */
	48
	49	/*
	50	* read from a secondary register on the PASIC3
	51	*/
	52	u8 pasic3_read_register(struct device *dev, u32 reg)
	53	{
	54	struct pasic3_data *asic = dev->driver_data;
	55	int bus_shift = asic->bus_shift;
	56	void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
	57	void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
	58
	59	__raw_writeb(READ_MODE \| reg, addr);
	60	return __raw_readb(data);
	61	}
	62	EXPORT_SYMBOL(pasic3_read_register); /* for leds-pasic3 */
	63
	64	/*
	65	* LEDs
	66	*/
	67
	68	static int led_device_add(struct device *pasic3_dev,
	69	const struct pasic3_leds_machinfo *pdata)
	70	{
	71	struct pasic3_data *asic = pasic3_dev->driver_data;
	72	struct platform_device *pdev;
	73	int ret;
	74
	75	pdev = platform_device_alloc("pasic3-led", -1);
	76	if (!pdev) {
	77	dev_dbg(pasic3_dev, "failed to allocate LED platform device\n");
	78	return -ENOMEM;
	79	}
	80
	81	ret = platform_device_add_data(pdev, pdata,
	82	sizeof(struct pasic3_leds_machinfo));
	83	if (ret < 0) {
	84	dev_dbg(pasic3_dev, "failed to add LED platform data\n");
	85	goto exit_pdev_put;
	86	}
	87
	88	pdev->dev.parent = pasic3_dev;
	89	ret = platform_device_add(pdev);
	90	if (ret < 0) {
	91	dev_dbg(pasic3_dev, "failed to add LED platform device\n");
	92	goto exit_pdev_put;
	93	}
	94
95	asic->led_pdev = pdev;
96	return 0;
97
98	exit_pdev_put:
99	platform_device_put(pdev);
100	return ret;
101	}
102
103	/*
104	* DS1WM
105	*/
106
107	static void ds1wm_enable(struct platform_device *pdev)
108	{
109	struct device *dev = pdev->dev.parent;
110	int c;
111
112	c = pasic3_read_register(dev, 0x28);
113	pasic3_write_register(dev, 0x28, c & 0x7f);
114
115	dev_dbg(dev, "DS1WM OWM_EN low (active) %02x\n", c & 0x7f);
116	}
117
118	static void ds1wm_disable(struct platform_device *pdev)
119	{
120	struct device *dev = pdev->dev.parent;
121	int c;
122
123	c = pasic3_read_register(dev, 0x28);
124	pasic3_write_register(dev, 0x28, c \| 0x80);
125
126	dev_dbg(dev, "DS1WM OWM_EN high (inactive) %02x\n", c \| 0x80);
127	}
128
129	static struct ds1wm_platform_data ds1wm_pdata = {
130	.bus_shift = 2,
131	.enable = ds1wm_enable,
132	.disable = ds1wm_disable,
133	};
134
5826042d	135	static int ds1wm_device_add(struct platform_device *pasic3_pdev, int bus_shift)
5dc3339a	136	{
5826042d	137	struct device *pasic3_dev = &pasic3_pdev->dev;
5dc3339a PZ	138	struct pasic3_data *asic = pasic3_dev->driver_data;
	139	struct platform_device *pdev;
	140	int ret;
	141
	142	pdev = platform_device_alloc("ds1wm", -1);
	143	if (!pdev) {
	144	dev_dbg(pasic3_dev, "failed to allocate DS1WM platform device\n");
	145	return -ENOMEM;
	146	}
	147
5826042d PZ	148	ret = platform_device_add_resources(pdev, pasic3_pdev->resource,
5826042d PZ	149	pasic3_pdev->num_resources);
5dc3339a PZ	150	if (ret < 0) {
	151	dev_dbg(pasic3_dev, "failed to add DS1WM resources\n");
	152	goto exit_pdev_put;
	153	}
	154
	155	ds1wm_pdata.bus_shift = asic->bus_shift;
	156	ret = platform_device_add_data(pdev, &ds1wm_pdata,
	157	sizeof(struct ds1wm_platform_data));
	158	if (ret < 0) {
	159	dev_dbg(pasic3_dev, "failed to add DS1WM platform data\n");
	160	goto exit_pdev_put;
	161	}
	162
	163	pdev->dev.parent = pasic3_dev;
	164	ret = platform_device_add(pdev);
	165	if (ret < 0) {
	166	dev_dbg(pasic3_dev, "failed to add DS1WM platform device\n");
	167	goto exit_pdev_put;
	168	}
	169
	170	asic->ds1wm_pdev = pdev;
	171	return 0;
	172
	173	exit_pdev_put:
	174	platform_device_put(pdev);
	175	return ret;
	176	}
	177
	178	static int __init pasic3_probe(struct platform_device *pdev)
	179	{
	180	struct pasic3_platform_data *pdata = pdev->dev.platform_data;
	181	struct device *dev = &pdev->dev;
	182	struct pasic3_data *asic;
	183	struct resource *r;
	184	int ret;
	185
	186	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	187	if (!r)
	188	return -ENXIO;
	189
	190	if (!request_mem_region(r->start, r->end - r->start + 1, "pasic3"))
	191	return -EBUSY;
	192
	193	asic = kzalloc(sizeof(struct pasic3_data), GFP_KERNEL);
	194	if (!asic)
	195	return -ENOMEM;
	196
	197	platform_set_drvdata(pdev, asic);
	198
	199	if (pdata && pdata->bus_shift)
	200	asic->bus_shift = pdata->bus_shift;
	201	else
	202	asic->bus_shift = 2;
	203
	204	asic->mapping = ioremap(r->start, r->end - r->start + 1);
	205	if (!asic->mapping) {
	206	dev_err(dev, "couldn't ioremap PASIC3\n");
	207	kfree(asic);
	208	return -ENOMEM;
	209	}
	210
5826042d	211	ret = ds1wm_device_add(pdev, asic->bus_shift);
5dc3339a PZ	212	if (ret < 0)
	213	dev_warn(dev, "failed to register DS1WM\n");
	214
	215	if (pdata->led_pdata) {
	216	ret = led_device_add(dev, pdata->led_pdata);
	217	if (ret < 0)
	218	dev_warn(dev, "failed to register LED device\n");
	219	}
	220
	221	return 0;
	222	}
	223
	224	static int pasic3_remove(struct platform_device *pdev)
	225	{
	226	struct pasic3_data *asic = platform_get_drvdata(pdev);
	227	struct resource *r;
	228
	229	if (asic->led_pdev)
	230	platform_device_unregister(asic->led_pdev);
	231	if (asic->ds1wm_pdev)
	232	platform_device_unregister(asic->ds1wm_pdev);
	233
	234	iounmap(asic->mapping);
	235	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	236	release_mem_region(r->start, r->end - r->start + 1);
	237	kfree(asic);
	238	return 0;
	239	}
	240
4f46d6e7 KS	241	MODULE_ALIAS("platform:pasic3");
4f46d6e7 KS	242
5dc3339a PZ	243	static struct platform_driver pasic3_driver = {
	244	.driver = {
	245	.name = "pasic3",
	246	},
	247	.remove = pasic3_remove,
	248	};
	249
	250	static int __init pasic3_base_init(void)
	251	{
	252	return platform_driver_probe(&pasic3_driver, pasic3_probe);
	253	}
	254
	255	static void __exit pasic3_base_exit(void)
	256	{
	257	platform_driver_unregister(&pasic3_driver);
	258	}
	259
	260	module_init(pasic3_base_init);
	261	module_exit(pasic3_base_exit);
	262
	263	MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
	264	MODULE_DESCRIPTION("Core driver for HTC PASIC3");
	265	MODULE_LICENSE("GPL");