[deliverable/linux.git] / drivers / input / misc / bfin_rotary.c

/*
 * Rotary counter driver for Analog Devices Blackfin Processors
 *
 * Copyright 2008-2009 Analog Devices Inc.
 * Licensed under the GPL-2 or later.
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/pm.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/platform_data/bfin_rotary.h>

#include <asm/portmux.h>

#define CNT_CONFIG_OFF		0	/* CNT Config Offset */
#define CNT_IMASK_OFF		4	/* CNT Interrupt Mask Offset */
#define CNT_STATUS_OFF		8	/* CNT Status Offset */
#define CNT_COMMAND_OFF		12	/* CNT Command Offset */
#define CNT_DEBOUNCE_OFF	16	/* CNT Debounce Offset */
#define CNT_COUNTER_OFF		20	/* CNT Counter Offset */
#define CNT_MAX_OFF		24	/* CNT Maximum Count Offset */
#define CNT_MIN_OFF		28	/* CNT Minimum Count Offset */

struct bfin_rot {
	struct input_dev *input;
	void __iomem *base;
	int irq;
	unsigned int up_key;
	unsigned int down_key;
	unsigned int button_key;
	unsigned int rel_code;
	unsigned short cnt_config;
	unsigned short cnt_imask;
	unsigned short cnt_debounce;
};

static void report_key_event(struct input_dev *input, int keycode)
{
	/* simulate a press-n-release */
	input_report_key(input, keycode, 1);
	input_sync(input);
	input_report_key(input, keycode, 0);
	input_sync(input);
}

static void report_rotary_event(struct bfin_rot *rotary, int delta)
{
	struct input_dev *input = rotary->input;

	if (rotary->up_key) {
		report_key_event(input,
				 delta > 0 ? rotary->up_key : rotary->down_key);
	} else {
		input_report_rel(input, rotary->rel_code, delta);
		input_sync(input);
	}
}

static irqreturn_t bfin_rotary_isr(int irq, void *dev_id)
{
	struct bfin_rot *rotary = dev_id;
	int delta;

	switch (readw(rotary->base + CNT_STATUS_OFF)) {

	case ICII:
		break;

	case UCII:
	case DCII:
		delta = readl(rotary->base + CNT_COUNTER_OFF);
		if (delta)
			report_rotary_event(rotary, delta);
		break;

	case CZMII:
		report_key_event(rotary->input, rotary->button_key);
		break;

	default:
		break;
	}

	writew(W1LCNT_ZERO, rotary->base + CNT_COMMAND_OFF); /* Clear COUNTER */
	writew(-1, rotary->base + CNT_STATUS_OFF); /* Clear STATUS */

	return IRQ_HANDLED;
}

static int bfin_rotary_probe(struct platform_device *pdev)
{
	const struct bfin_rotary_platform_data *pdata =
					dev_get_platdata(&pdev->dev);
	struct device *dev = &pdev->dev;
	struct bfin_rot *rotary;
	struct resource *res;
	struct input_dev *input;
	int error;

	/* Basic validation */
	if ((pdata->rotary_up_key && !pdata->rotary_down_key) ||
	    (!pdata->rotary_up_key && pdata->rotary_down_key)) {
		return -EINVAL;
	}

	if (pdata->pin_list) {
		error = peripheral_request_list(pdata->pin_list,
						dev_name(&pdev->dev));
		if (error) {
			dev_err(&pdev->dev, "requesting peripherals failed\n");
			return error;
		}
	}

	rotary = kzalloc(sizeof(struct bfin_rot), GFP_KERNEL);
	input = input_allocate_device();
	if (!rotary || !input) {
		error = -ENOMEM;
		goto out1;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	rotary->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(rotary->base)) {
		error = PTR_ERR(rotary->base);
		goto out1;
	}

	rotary->input = input;

	rotary->up_key = pdata->rotary_up_key;
	rotary->down_key = pdata->rotary_down_key;
	rotary->button_key = pdata->rotary_button_key;
	rotary->rel_code = pdata->rotary_rel_code;

	error = rotary->irq = platform_get_irq(pdev, 0);
	if (error < 0)
		goto out1;

	input->name = pdev->name;
	input->phys = "bfin-rotary/input0";
	input->dev.parent = &pdev->dev;

	input_set_drvdata(input, rotary);

	input->id.bustype = BUS_HOST;
	input->id.vendor = 0x0001;
	input->id.product = 0x0001;
	input->id.version = 0x0100;

	if (rotary->up_key) {
		__set_bit(EV_KEY, input->evbit);
		__set_bit(rotary->up_key, input->keybit);
		__set_bit(rotary->down_key, input->keybit);
	} else {
		__set_bit(EV_REL, input->evbit);
		__set_bit(rotary->rel_code, input->relbit);
	}

	if (rotary->button_key) {
		__set_bit(EV_KEY, input->evbit);
		__set_bit(rotary->button_key, input->keybit);
	}

	error = request_irq(rotary->irq, bfin_rotary_isr,
			    0, dev_name(&pdev->dev), rotary);
	if (error) {
		dev_err(&pdev->dev,
			"unable to claim irq %d; error %d\n",
			rotary->irq, error);
		goto out1;
	}

	error = input_register_device(input);
	if (error) {
		dev_err(&pdev->dev,
			"unable to register input device (%d)\n", error);
		goto out2;
	}

	if (pdata->rotary_button_key)
		writew(CZMIE, rotary->base + CNT_IMASK_OFF);

	if (pdata->mode & ROT_DEBE)
		writew(pdata->debounce & DPRESCALE,
			rotary->base + CNT_DEBOUNCE_OFF);

	if (pdata->mode)
		writew(readw(rotary->base + CNT_CONFIG_OFF) |
			(pdata->mode & ~CNTE),
			rotary->base + CNT_CONFIG_OFF);

	writew(readw(rotary->base + CNT_IMASK_OFF) | UCIE | DCIE,
		rotary->base + CNT_IMASK_OFF);
	writew(readw(rotary->base + CNT_CONFIG_OFF) | CNTE,
		rotary->base + CNT_CONFIG_OFF);

	platform_set_drvdata(pdev, rotary);
	device_init_wakeup(&pdev->dev, 1);

	return 0;

out2:
	free_irq(rotary->irq, rotary);
out1:
	input_free_device(input);
	kfree(rotary);
	if (pdata->pin_list)
		peripheral_free_list(pdata->pin_list);

	return error;
}

static int bfin_rotary_remove(struct platform_device *pdev)
{
	const struct bfin_rotary_platform_data *pdata =
					dev_get_platdata(&pdev->dev);
	struct bfin_rot *rotary = platform_get_drvdata(pdev);

	writew(0, rotary->base + CNT_CONFIG_OFF);
	writew(0, rotary->base + CNT_IMASK_OFF);

	free_irq(rotary->irq, rotary);
	input_unregister_device(rotary->input);

	if (pdata->pin_list)
		peripheral_free_list(pdata->pin_list);

	kfree(rotary);

	return 0;
}

static int __maybe_unused bfin_rotary_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct bfin_rot *rotary = platform_get_drvdata(pdev);

	rotary->cnt_config = readw(rotary->base + CNT_CONFIG_OFF);
	rotary->cnt_imask = readw(rotary->base + CNT_IMASK_OFF);
	rotary->cnt_debounce = readw(rotary->base + CNT_DEBOUNCE_OFF);

	if (device_may_wakeup(&pdev->dev))
		enable_irq_wake(rotary->irq);

	return 0;
}

static int __maybe_unused bfin_rotary_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct bfin_rot *rotary = platform_get_drvdata(pdev);

	writew(rotary->cnt_debounce, rotary->base + CNT_DEBOUNCE_OFF);
	writew(rotary->cnt_imask, rotary->base + CNT_IMASK_OFF);
	writew(rotary->cnt_config & ~CNTE, rotary->base + CNT_CONFIG_OFF);

	if (device_may_wakeup(&pdev->dev))
		disable_irq_wake(rotary->irq);

	if (rotary->cnt_config & CNTE)
		writew(rotary->cnt_config, rotary->base + CNT_CONFIG_OFF);

	return 0;
}

static SIMPLE_DEV_PM_OPS(bfin_rotary_pm_ops,
			 bfin_rotary_suspend, bfin_rotary_resume);

static struct platform_driver bfin_rotary_device_driver = {
	.probe		= bfin_rotary_probe,
	.remove		= bfin_rotary_remove,
	.driver		= {
		.name	= "bfin-rotary",
		.pm	= &bfin_rotary_pm_ops,
	},
};
module_platform_driver(bfin_rotary_device_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Rotary Counter driver for Blackfin Processors");
MODULE_ALIAS("platform:bfin-rotary");
Commit	Line	Data
48329582 MH	1	/*
	2	* Rotary counter driver for Analog Devices Blackfin Processors
	3	*
	4	* Copyright 2008-2009 Analog Devices Inc.
	5	* Licensed under the GPL-2 or later.
	6	*/
	7
	8	#include <linux/module.h>
48329582	9	#include <linux/interrupt.h>
71adf22f	10	#include <linux/io.h>
48329582 MH	11	#include <linux/irq.h>
	12	#include <linux/pm.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/input.h>
5a0e3ad6	15	#include <linux/slab.h>
1ea74014	16	#include <linux/platform_data/bfin_rotary.h>
48329582 MH	17
48329582 MH	18	#include <asm/portmux.h>
48329582	19
71adf22f SZ	20	#define CNT_CONFIG_OFF 0 /* CNT Config Offset */
	21	#define CNT_IMASK_OFF 4 /* CNT Interrupt Mask Offset */
	22	#define CNT_STATUS_OFF 8 /* CNT Status Offset */
	23	#define CNT_COMMAND_OFF 12 /* CNT Command Offset */
	24	#define CNT_DEBOUNCE_OFF 16 /* CNT Debounce Offset */
	25	#define CNT_COUNTER_OFF 20 /* CNT Counter Offset */
	26	#define CNT_MAX_OFF 24 /* CNT Maximum Count Offset */
	27	#define CNT_MIN_OFF 28 /* CNT Minimum Count Offset */
	28
48329582 MH	29	struct bfin_rot {
48329582 MH	30	struct input_dev *input;
71adf22f	31	void __iomem *base;
48329582 MH	32	int irq;
	33	unsigned int up_key;
	34	unsigned int down_key;
	35	unsigned int button_key;
	36	unsigned int rel_code;
	37	unsigned short cnt_config;
	38	unsigned short cnt_imask;
	39	unsigned short cnt_debounce;
	40	};
	41
	42	static void report_key_event(struct input_dev *input, int keycode)
	43	{
	44	/* simulate a press-n-release */
	45	input_report_key(input, keycode, 1);
	46	input_sync(input);
	47	input_report_key(input, keycode, 0);
	48	input_sync(input);
	49	}
	50
	51	static void report_rotary_event(struct bfin_rot *rotary, int delta)
	52	{
	53	struct input_dev *input = rotary->input;
	54
	55	if (rotary->up_key) {
	56	report_key_event(input,
	57	delta > 0 ? rotary->up_key : rotary->down_key);
	58	} else {
	59	input_report_rel(input, rotary->rel_code, delta);
	60	input_sync(input);
	61	}
	62	}
	63
	64	static irqreturn_t bfin_rotary_isr(int irq, void *dev_id)
	65	{
7694f44d	66	struct bfin_rot *rotary = dev_id;
48329582 MH	67	int delta;
48329582 MH	68
71adf22f	69	switch (readw(rotary->base + CNT_STATUS_OFF)) {
48329582 MH	70
	71	case ICII:
	72	break;
	73
	74	case UCII:
	75	case DCII:
71adf22f	76	delta = readl(rotary->base + CNT_COUNTER_OFF);
48329582 MH	77	if (delta)
	78	report_rotary_event(rotary, delta);
	79	break;
	80
	81	case CZMII:
	82	report_key_event(rotary->input, rotary->button_key);
	83	break;
	84
	85	default:
	86	break;
	87	}
	88
71adf22f SZ	89	writew(W1LCNT_ZERO, rotary->base + CNT_COMMAND_OFF); /* Clear COUNTER */
71adf22f SZ	90	writew(-1, rotary->base + CNT_STATUS_OFF); /* Clear STATUS */
48329582 MH	91
	92	return IRQ_HANDLED;
	93	}
	94
5298cc4c	95	static int bfin_rotary_probe(struct platform_device *pdev)
48329582	96	{
5ea0699a SZ	97	const struct bfin_rotary_platform_data *pdata =
5ea0699a SZ	98	dev_get_platdata(&pdev->dev);
71adf22f	99	struct device *dev = &pdev->dev;
48329582	100	struct bfin_rot *rotary;
71adf22f	101	struct resource *res;
48329582 MH	102	struct input_dev *input;
	103	int error;
	104
	105	/* Basic validation */
	106	if ((pdata->rotary_up_key && !pdata->rotary_down_key) \|\|
	107	(!pdata->rotary_up_key && pdata->rotary_down_key)) {
	108	return -EINVAL;
	109	}
	110
5ea0699a SZ	111	if (pdata->pin_list) {
	112	error = peripheral_request_list(pdata->pin_list,
	113	dev_name(&pdev->dev));
	114	if (error) {
	115	dev_err(&pdev->dev, "requesting peripherals failed\n");
	116	return error;
	117	}
48329582 MH	118	}
	119
	120	rotary = kzalloc(sizeof(struct bfin_rot), GFP_KERNEL);
	121	input = input_allocate_device();
	122	if (!rotary \|\| !input) {
	123	error = -ENOMEM;
	124	goto out1;
	125	}
	126
71adf22f SZ	127	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	128	rotary->base = devm_ioremap_resource(dev, res);
	129	if (IS_ERR(rotary->base)) {
	130	error = PTR_ERR(rotary->base);
	131	goto out1;
	132	}
	133
48329582 MH	134	rotary->input = input;
	135
	136	rotary->up_key = pdata->rotary_up_key;
	137	rotary->down_key = pdata->rotary_down_key;
	138	rotary->button_key = pdata->rotary_button_key;
	139	rotary->rel_code = pdata->rotary_rel_code;
	140
	141	error = rotary->irq = platform_get_irq(pdev, 0);
	142	if (error < 0)
	143	goto out1;
	144
	145	input->name = pdev->name;
	146	input->phys = "bfin-rotary/input0";
	147	input->dev.parent = &pdev->dev;
	148
	149	input_set_drvdata(input, rotary);
	150
	151	input->id.bustype = BUS_HOST;
	152	input->id.vendor = 0x0001;
	153	input->id.product = 0x0001;
	154	input->id.version = 0x0100;
	155
	156	if (rotary->up_key) {
	157	__set_bit(EV_KEY, input->evbit);
	158	__set_bit(rotary->up_key, input->keybit);
	159	__set_bit(rotary->down_key, input->keybit);
	160	} else {
	161	__set_bit(EV_REL, input->evbit);
	162	__set_bit(rotary->rel_code, input->relbit);
	163	}
	164
	165	if (rotary->button_key) {
	166	__set_bit(EV_KEY, input->evbit);
	167	__set_bit(rotary->button_key, input->keybit);
	168	}
	169
	170	error = request_irq(rotary->irq, bfin_rotary_isr,
7694f44d	171	0, dev_name(&pdev->dev), rotary);
48329582 MH	172	if (error) {
	173	dev_err(&pdev->dev,
	174	"unable to claim irq %d; error %d\n",
	175	rotary->irq, error);
	176	goto out1;
	177	}
	178
	179	error = input_register_device(input);
	180	if (error) {
	181	dev_err(&pdev->dev,
	182	"unable to register input device (%d)\n", error);
	183	goto out2;
	184	}
	185
	186	if (pdata->rotary_button_key)
71adf22f	187	writew(CZMIE, rotary->base + CNT_IMASK_OFF);
48329582 MH	188
48329582 MH	189	if (pdata->mode & ROT_DEBE)
71adf22f SZ	190	writew(pdata->debounce & DPRESCALE,
71adf22f SZ	191	rotary->base + CNT_DEBOUNCE_OFF);
48329582 MH	192
48329582 MH	193	if (pdata->mode)
71adf22f SZ	194	writew(readw(rotary->base + CNT_CONFIG_OFF) \|
	195	(pdata->mode & ~CNTE),
	196	rotary->base + CNT_CONFIG_OFF);
48329582	197
71adf22f SZ	198	writew(readw(rotary->base + CNT_IMASK_OFF) \| UCIE \| DCIE,
	199	rotary->base + CNT_IMASK_OFF);
	200	writew(readw(rotary->base + CNT_CONFIG_OFF) \| CNTE,
	201	rotary->base + CNT_CONFIG_OFF);
48329582 MH	202
	203	platform_set_drvdata(pdev, rotary);
	204	device_init_wakeup(&pdev->dev, 1);
	205
	206	return 0;
	207
	208	out2:
7694f44d	209	free_irq(rotary->irq, rotary);
48329582 MH	210	out1:
	211	input_free_device(input);
	212	kfree(rotary);
5ea0699a SZ	213	if (pdata->pin_list)
5ea0699a SZ	214	peripheral_free_list(pdata->pin_list);
48329582 MH	215
	216	return error;
	217	}
	218
e2619cf7	219	static int bfin_rotary_remove(struct platform_device *pdev)
48329582	220	{
5ea0699a SZ	221	const struct bfin_rotary_platform_data *pdata =
5ea0699a SZ	222	dev_get_platdata(&pdev->dev);
48329582 MH	223	struct bfin_rot *rotary = platform_get_drvdata(pdev);
48329582 MH	224
71adf22f SZ	225	writew(0, rotary->base + CNT_CONFIG_OFF);
71adf22f SZ	226	writew(0, rotary->base + CNT_IMASK_OFF);
48329582	227
7694f44d	228	free_irq(rotary->irq, rotary);
48329582	229	input_unregister_device(rotary->input);
5ea0699a SZ	230
	231	if (pdata->pin_list)
	232	peripheral_free_list(pdata->pin_list);
48329582 MH	233
48329582 MH	234	kfree(rotary);
48329582 MH	235
	236	return 0;
	237	}
	238
5ec662e7	239	static int __maybe_unused bfin_rotary_suspend(struct device *dev)
48329582 MH	240	{
	241	struct platform_device *pdev = to_platform_device(dev);
	242	struct bfin_rot *rotary = platform_get_drvdata(pdev);
	243
71adf22f SZ	244	rotary->cnt_config = readw(rotary->base + CNT_CONFIG_OFF);
	245	rotary->cnt_imask = readw(rotary->base + CNT_IMASK_OFF);
	246	rotary->cnt_debounce = readw(rotary->base + CNT_DEBOUNCE_OFF);
48329582 MH	247
	248	if (device_may_wakeup(&pdev->dev))
	249	enable_irq_wake(rotary->irq);
	250
	251	return 0;
	252	}
	253
5ec662e7	254	static int __maybe_unused bfin_rotary_resume(struct device *dev)
48329582 MH	255	{
	256	struct platform_device *pdev = to_platform_device(dev);
	257	struct bfin_rot *rotary = platform_get_drvdata(pdev);
	258
71adf22f SZ	259	writew(rotary->cnt_debounce, rotary->base + CNT_DEBOUNCE_OFF);
	260	writew(rotary->cnt_imask, rotary->base + CNT_IMASK_OFF);
	261	writew(rotary->cnt_config & ~CNTE, rotary->base + CNT_CONFIG_OFF);
48329582 MH	262
	263	if (device_may_wakeup(&pdev->dev))
	264	disable_irq_wake(rotary->irq);
	265
	266	if (rotary->cnt_config & CNTE)
71adf22f	267	writew(rotary->cnt_config, rotary->base + CNT_CONFIG_OFF);
48329582 MH	268
	269	return 0;
	270	}
	271
5ec662e7 DT	272	static SIMPLE_DEV_PM_OPS(bfin_rotary_pm_ops,
5ec662e7 DT	273	bfin_rotary_suspend, bfin_rotary_resume);
48329582 MH	274
	275	static struct platform_driver bfin_rotary_device_driver = {
	276	.probe = bfin_rotary_probe,
1cb0aa88	277	.remove = bfin_rotary_remove,
48329582 MH	278	.driver = {
48329582 MH	279	.name = "bfin-rotary",
48329582	280	.pm = &bfin_rotary_pm_ops,
48329582 MH	281	},
48329582 MH	282	};
840a746b	283	module_platform_driver(bfin_rotary_device_driver);
48329582 MH	284
	285	MODULE_LICENSE("GPL");
	286	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	287	MODULE_DESCRIPTION("Rotary Counter driver for Blackfin Processors");
	288	MODULE_ALIAS("platform:bfin-rotary");