[mirror_ubuntu-artful-kernel.git] / drivers / input / keyboard / spear-keyboard.c

/*
 * SPEAr Keyboard Driver
 * Based on omap-keypad driver
 *
 * Copyright (C) 2010 ST Microelectronics
 * Rajeev Kumar <rajeevkumar.linux@gmail.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/clk.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_wakeup.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/platform_data/keyboard-spear.h>

/* Keyboard Registers */
#define MODE_CTL_REG	0x00
#define STATUS_REG	0x0C
#define DATA_REG	0x10
#define INTR_MASK	0x54

/* Register Values */
#define NUM_ROWS	16
#define NUM_COLS	16
#define MODE_CTL_PCLK_FREQ_SHIFT	9
#define MODE_CTL_PCLK_FREQ_MSK		0x7F

#define MODE_CTL_KEYBOARD	(0x2 << 0)
#define MODE_CTL_SCAN_RATE_10	(0x0 << 2)
#define MODE_CTL_SCAN_RATE_20	(0x1 << 2)
#define MODE_CTL_SCAN_RATE_40	(0x2 << 2)
#define MODE_CTL_SCAN_RATE_80	(0x3 << 2)
#define MODE_CTL_KEYNUM_SHIFT	6
#define MODE_CTL_START_SCAN	(0x1 << 8)

#define STATUS_DATA_AVAIL	(0x1 << 1)

#define DATA_ROW_MASK		0xF0
#define DATA_COLUMN_MASK	0x0F

#define ROW_SHIFT		4

struct spear_kbd {
	struct input_dev *input;
	void __iomem *io_base;
	struct clk *clk;
	unsigned int irq;
	unsigned int mode;
	unsigned int suspended_rate;
	unsigned short last_key;
	unsigned short keycodes[NUM_ROWS * NUM_COLS];
	bool rep;
	bool irq_wake_enabled;
	u32 mode_ctl_reg;
};

static irqreturn_t spear_kbd_interrupt(int irq, void *dev_id)
{
	struct spear_kbd *kbd = dev_id;
	struct input_dev *input = kbd->input;
	unsigned int key;
	u32 sts, val;

	sts = readl_relaxed(kbd->io_base + STATUS_REG);
	if (!(sts & STATUS_DATA_AVAIL))
		return IRQ_NONE;

	if (kbd->last_key != KEY_RESERVED) {
		input_report_key(input, kbd->last_key, 0);
		kbd->last_key = KEY_RESERVED;
	}

	/* following reads active (row, col) pair */
	val = readl_relaxed(kbd->io_base + DATA_REG) &
		(DATA_ROW_MASK | DATA_COLUMN_MASK);
	key = kbd->keycodes[val];

	input_event(input, EV_MSC, MSC_SCAN, val);
	input_report_key(input, key, 1);
	input_sync(input);

	kbd->last_key = key;

	/* clear interrupt */
	writel_relaxed(0, kbd->io_base + STATUS_REG);

	return IRQ_HANDLED;
}

static int spear_kbd_open(struct input_dev *dev)
{
	struct spear_kbd *kbd = input_get_drvdata(dev);
	int error;
	u32 val;

	kbd->last_key = KEY_RESERVED;

	error = clk_enable(kbd->clk);
	if (error)
		return error;

	/* keyboard rate to be programmed is input clock (in MHz) - 1 */
	val = clk_get_rate(kbd->clk) / 1000000 - 1;
	val = (val & MODE_CTL_PCLK_FREQ_MSK) << MODE_CTL_PCLK_FREQ_SHIFT;

	/* program keyboard */
	val = MODE_CTL_SCAN_RATE_80 | MODE_CTL_KEYBOARD | val |
		(kbd->mode << MODE_CTL_KEYNUM_SHIFT);
	writel_relaxed(val, kbd->io_base + MODE_CTL_REG);
	writel_relaxed(1, kbd->io_base + STATUS_REG);

	/* start key scan */
	val = readl_relaxed(kbd->io_base + MODE_CTL_REG);
	val |= MODE_CTL_START_SCAN;
	writel_relaxed(val, kbd->io_base + MODE_CTL_REG);

	return 0;
}

static void spear_kbd_close(struct input_dev *dev)
{
	struct spear_kbd *kbd = input_get_drvdata(dev);
	u32 val;

	/* stop key scan */
	val = readl_relaxed(kbd->io_base + MODE_CTL_REG);
	val &= ~MODE_CTL_START_SCAN;
	writel_relaxed(val, kbd->io_base + MODE_CTL_REG);

	clk_disable(kbd->clk);

	kbd->last_key = KEY_RESERVED;
}

#ifdef CONFIG_OF
static int spear_kbd_parse_dt(struct platform_device *pdev,
                                        struct spear_kbd *kbd)
{
	struct device_node *np = pdev->dev.of_node;
	int error;
	u32 val, suspended_rate;

	if (!np) {
		dev_err(&pdev->dev, "Missing DT data\n");
		return -EINVAL;
	}

	if (of_property_read_bool(np, "autorepeat"))
		kbd->rep = true;

	if (of_property_read_u32(np, "suspended_rate", &suspended_rate))
		kbd->suspended_rate = suspended_rate;

	error = of_property_read_u32(np, "st,mode", &val);
	if (error) {
		dev_err(&pdev->dev, "DT: Invalid or missing mode\n");
		return error;
	}

	kbd->mode = val;
	return 0;
}
#else
static inline int spear_kbd_parse_dt(struct platform_device *pdev,
				     struct spear_kbd *kbd)
{
	return -ENOSYS;
}
#endif

static int spear_kbd_probe(struct platform_device *pdev)
{
	struct kbd_platform_data *pdata = dev_get_platdata(&pdev->dev);
	const struct matrix_keymap_data *keymap = pdata ? pdata->keymap : NULL;
	struct spear_kbd *kbd;
	struct input_dev *input_dev;
	struct resource *res;
	int irq;
	int error;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "not able to get irq for the device\n");
		return irq;
	}

	kbd = devm_kzalloc(&pdev->dev, sizeof(*kbd), GFP_KERNEL);
	if (!kbd) {
		dev_err(&pdev->dev, "not enough memory for driver data\n");
		return -ENOMEM;
	}

	input_dev = devm_input_allocate_device(&pdev->dev);
	if (!input_dev) {
		dev_err(&pdev->dev, "unable to allocate input device\n");
		return -ENOMEM;
	}

	kbd->input = input_dev;
	kbd->irq = irq;

	if (!pdata) {
		error = spear_kbd_parse_dt(pdev, kbd);
		if (error)
			return error;
	} else {
		kbd->mode = pdata->mode;
		kbd->rep = pdata->rep;
		kbd->suspended_rate = pdata->suspended_rate;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	kbd->io_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(kbd->io_base))
		return PTR_ERR(kbd->io_base);

	kbd->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(kbd->clk))
		return PTR_ERR(kbd->clk);

	input_dev->name = "Spear Keyboard";
	input_dev->phys = "keyboard/input0";
	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor = 0x0001;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0100;
	input_dev->open = spear_kbd_open;
	input_dev->close = spear_kbd_close;

	error = matrix_keypad_build_keymap(keymap, NULL, NUM_ROWS, NUM_COLS,
					   kbd->keycodes, input_dev);
	if (error) {
		dev_err(&pdev->dev, "Failed to build keymap\n");
		return error;
	}

	if (kbd->rep)
		__set_bit(EV_REP, input_dev->evbit);
	input_set_capability(input_dev, EV_MSC, MSC_SCAN);

	input_set_drvdata(input_dev, kbd);

	error = devm_request_irq(&pdev->dev, irq, spear_kbd_interrupt, 0,
			"keyboard", kbd);
	if (error) {
		dev_err(&pdev->dev, "request_irq failed\n");
		return error;
	}

	error = clk_prepare(kbd->clk);
	if (error)
		return error;

	error = input_register_device(input_dev);
	if (error) {
		dev_err(&pdev->dev, "Unable to register keyboard device\n");
		clk_unprepare(kbd->clk);
		return error;
	}

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

	return 0;
}

static int spear_kbd_remove(struct platform_device *pdev)
{
	struct spear_kbd *kbd = platform_get_drvdata(pdev);

	input_unregister_device(kbd->input);
	clk_unprepare(kbd->clk);

	device_init_wakeup(&pdev->dev, 0);

	return 0;
}

static int __maybe_unused spear_kbd_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct spear_kbd *kbd = platform_get_drvdata(pdev);
	struct input_dev *input_dev = kbd->input;
	unsigned int rate = 0, mode_ctl_reg, val;

	mutex_lock(&input_dev->mutex);

	/* explicitly enable clock as we may program device */
	clk_enable(kbd->clk);

	mode_ctl_reg = readl_relaxed(kbd->io_base + MODE_CTL_REG);

	if (device_may_wakeup(&pdev->dev)) {
		if (!enable_irq_wake(kbd->irq))
			kbd->irq_wake_enabled = true;

		/*
		 * reprogram the keyboard operating frequency as on some
		 * platform it may change during system suspended
		 */
		if (kbd->suspended_rate)
			rate = kbd->suspended_rate / 1000000 - 1;
		else
			rate = clk_get_rate(kbd->clk) / 1000000 - 1;

		val = mode_ctl_reg &
			~(MODE_CTL_PCLK_FREQ_MSK << MODE_CTL_PCLK_FREQ_SHIFT);
		val |= (rate & MODE_CTL_PCLK_FREQ_MSK)
			<< MODE_CTL_PCLK_FREQ_SHIFT;
		writel_relaxed(val, kbd->io_base + MODE_CTL_REG);

	} else {
		if (input_dev->users) {
			writel_relaxed(mode_ctl_reg & ~MODE_CTL_START_SCAN,
					kbd->io_base + MODE_CTL_REG);
			clk_disable(kbd->clk);
		}
	}

	/* store current configuration */
	if (input_dev->users)
		kbd->mode_ctl_reg = mode_ctl_reg;

	/* restore previous clk state */
	clk_disable(kbd->clk);

	mutex_unlock(&input_dev->mutex);

	return 0;
}

static int __maybe_unused spear_kbd_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct spear_kbd *kbd = platform_get_drvdata(pdev);
	struct input_dev *input_dev = kbd->input;

	mutex_lock(&input_dev->mutex);

	if (device_may_wakeup(&pdev->dev)) {
		if (kbd->irq_wake_enabled) {
			kbd->irq_wake_enabled = false;
			disable_irq_wake(kbd->irq);
		}
	} else {
		if (input_dev->users)
			clk_enable(kbd->clk);
	}

	/* restore current configuration */
	if (input_dev->users)
		writel_relaxed(kbd->mode_ctl_reg, kbd->io_base + MODE_CTL_REG);

	mutex_unlock(&input_dev->mutex);

	return 0;
}

static SIMPLE_DEV_PM_OPS(spear_kbd_pm_ops, spear_kbd_suspend, spear_kbd_resume);

#ifdef CONFIG_OF
static const struct of_device_id spear_kbd_id_table[] = {
	{ .compatible = "st,spear300-kbd" },
	{}
};
MODULE_DEVICE_TABLE(of, spear_kbd_id_table);
#endif

static struct platform_driver spear_kbd_driver = {
	.probe		= spear_kbd_probe,
	.remove		= spear_kbd_remove,
	.driver		= {
		.name	= "keyboard",
		.pm	= &spear_kbd_pm_ops,
		.of_match_table = of_match_ptr(spear_kbd_id_table),
	},
};
module_platform_driver(spear_kbd_driver);

MODULE_AUTHOR("Rajeev Kumar");
MODULE_DESCRIPTION("SPEAr Keyboard Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
bc95df78 RK	1	/*
	2	* SPEAr Keyboard Driver
	3	* Based on omap-keypad driver
	4	*
	5	* Copyright (C) 2010 ST Microelectronics
25d238b2	6	* Rajeev Kumar <rajeevkumar.linux@gmail.com>
bc95df78 RK	7	*
	8	* This file is licensed under the terms of the GNU General Public
	9	* License version 2. This program is licensed "as is" without any
	10	* warranty of any kind, whether express or implied.
	11	*/
	12
	13	#include <linux/clk.h>
	14	#include <linux/errno.h>
bc95df78 RK	15	#include <linux/interrupt.h>
	16	#include <linux/input.h>
	17	#include <linux/io.h>
	18	#include <linux/irq.h>
	19	#include <linux/kernel.h>
	20	#include <linux/module.h>
829c4f96	21	#include <linux/of.h>
bc95df78 RK	22	#include <linux/platform_device.h>
	23	#include <linux/pm_wakeup.h>
	24	#include <linux/slab.h>
	25	#include <linux/types.h>
6884b680	26	#include <linux/platform_data/keyboard-spear.h>
bc95df78 RK	27
bc95df78 RK	28	/* Keyboard Registers */
f6f2efa3	29	#define MODE_CTL_REG 0x00
e99191f0 SH	30	#define STATUS_REG 0x0C
e99191f0 SH	31	#define DATA_REG 0x10
bc95df78 RK	32	#define INTR_MASK 0x54
	33
	34	/* Register Values */
1932811f DT	35	#define NUM_ROWS 16
1932811f DT	36	#define NUM_COLS 16
98e4d4d6 SH	37	#define MODE_CTL_PCLK_FREQ_SHIFT 9
98e4d4d6 SH	38	#define MODE_CTL_PCLK_FREQ_MSK 0x7F
1932811f	39
f6f2efa3 SH	40	#define MODE_CTL_KEYBOARD (0x2 << 0)
	41	#define MODE_CTL_SCAN_RATE_10 (0x0 << 2)
	42	#define MODE_CTL_SCAN_RATE_20 (0x1 << 2)
	43	#define MODE_CTL_SCAN_RATE_40 (0x2 << 2)
	44	#define MODE_CTL_SCAN_RATE_80 (0x3 << 2)
	45	#define MODE_CTL_KEYNUM_SHIFT 6
	46	#define MODE_CTL_START_SCAN (0x1 << 8)
	47
	48	#define STATUS_DATA_AVAIL (0x1 << 1)
	49
	50	#define DATA_ROW_MASK 0xF0
	51	#define DATA_COLUMN_MASK 0x0F
	52
	53	#define ROW_SHIFT 4
bc95df78 RK	54
	55	struct spear_kbd {
	56	struct input_dev *input;
bc95df78 RK	57	void __iomem *io_base;
	58	struct clk *clk;
	59	unsigned int irq;
f8354c60	60	unsigned int mode;
1eee4af3	61	unsigned int suspended_rate;
bc95df78	62	unsigned short last_key;
1932811f	63	unsigned short keycodes[NUM_ROWS * NUM_COLS];
829c4f96	64	bool rep;
1eee4af3	65	bool irq_wake_enabled;
8314f532	66	u32 mode_ctl_reg;
bc95df78 RK	67	};
	68
	69	static irqreturn_t spear_kbd_interrupt(int irq, void *dev_id)
	70	{
	71	struct spear_kbd *kbd = dev_id;
	72	struct input_dev *input = kbd->input;
	73	unsigned int key;
e99191f0	74	u32 sts, val;
bc95df78	75
e99191f0	76	sts = readl_relaxed(kbd->io_base + STATUS_REG);
f6f2efa3	77	if (!(sts & STATUS_DATA_AVAIL))
bc95df78 RK	78	return IRQ_NONE;
	79
	80	if (kbd->last_key != KEY_RESERVED) {
	81	input_report_key(input, kbd->last_key, 0);
	82	kbd->last_key = KEY_RESERVED;
	83	}
	84
	85	/* following reads active (row, col) pair */
f6f2efa3 SH	86	val = readl_relaxed(kbd->io_base + DATA_REG) &
f6f2efa3 SH	87	(DATA_ROW_MASK \| DATA_COLUMN_MASK);
bc95df78 RK	88	key = kbd->keycodes[val];
	89
	90	input_event(input, EV_MSC, MSC_SCAN, val);
	91	input_report_key(input, key, 1);
	92	input_sync(input);
	93
	94	kbd->last_key = key;
	95
	96	/* clear interrupt */
e99191f0	97	writel_relaxed(0, kbd->io_base + STATUS_REG);
bc95df78 RK	98
	99	return IRQ_HANDLED;
	100	}
	101
	102	static int spear_kbd_open(struct input_dev *dev)
	103	{
	104	struct spear_kbd *kbd = input_get_drvdata(dev);
	105	int error;
e99191f0	106	u32 val;
bc95df78 RK	107
	108	kbd->last_key = KEY_RESERVED;
	109
	110	error = clk_enable(kbd->clk);
	111	if (error)
	112	return error;
	113
98e4d4d6 SH	114	/* keyboard rate to be programmed is input clock (in MHz) - 1 */
	115	val = clk_get_rate(kbd->clk) / 1000000 - 1;
	116	val = (val & MODE_CTL_PCLK_FREQ_MSK) << MODE_CTL_PCLK_FREQ_SHIFT;
	117
bc95df78	118	/* program keyboard */
98e4d4d6	119	val = MODE_CTL_SCAN_RATE_80 \| MODE_CTL_KEYBOARD \| val \|
f6f2efa3 SH	120	(kbd->mode << MODE_CTL_KEYNUM_SHIFT);
f6f2efa3 SH	121	writel_relaxed(val, kbd->io_base + MODE_CTL_REG);
e99191f0	122	writel_relaxed(1, kbd->io_base + STATUS_REG);
bc95df78 RK	123
bc95df78 RK	124	/* start key scan */
f6f2efa3 SH	125	val = readl_relaxed(kbd->io_base + MODE_CTL_REG);
	126	val \|= MODE_CTL_START_SCAN;
	127	writel_relaxed(val, kbd->io_base + MODE_CTL_REG);
bc95df78 RK	128
	129	return 0;
	130	}
	131
	132	static void spear_kbd_close(struct input_dev *dev)
	133	{
	134	struct spear_kbd *kbd = input_get_drvdata(dev);
e99191f0	135	u32 val;
bc95df78 RK	136
bc95df78 RK	137	/* stop key scan */
f6f2efa3 SH	138	val = readl_relaxed(kbd->io_base + MODE_CTL_REG);
	139	val &= ~MODE_CTL_START_SCAN;
	140	writel_relaxed(val, kbd->io_base + MODE_CTL_REG);
bc95df78 RK	141
	142	clk_disable(kbd->clk);
	143
	144	kbd->last_key = KEY_RESERVED;
	145	}
	146
829c4f96	147	#ifdef CONFIG_OF
5298cc4c	148	static int spear_kbd_parse_dt(struct platform_device *pdev,
829c4f96	149	struct spear_kbd *kbd)
bc95df78	150	{
829c4f96	151	struct device_node *np = pdev->dev.of_node;
bc95df78	152	int error;
8314f532	153	u32 val, suspended_rate;
bc95df78	154
829c4f96 VK	155	if (!np) {
829c4f96 VK	156	dev_err(&pdev->dev, "Missing DT data\n");
bc95df78 RK	157	return -EINVAL;
	158	}
	159
829c4f96 VK	160	if (of_property_read_bool(np, "autorepeat"))
	161	kbd->rep = true;
	162
8314f532 SH	163	if (of_property_read_u32(np, "suspended_rate", &suspended_rate))
	164	kbd->suspended_rate = suspended_rate;
	165
829c4f96 VK	166	error = of_property_read_u32(np, "st,mode", &val);
	167	if (error) {
	168	dev_err(&pdev->dev, "DT: Invalid or missing mode\n");
	169	return error;
bc95df78 RK	170	}
bc95df78 RK	171
829c4f96 VK	172	kbd->mode = val;
	173	return 0;
	174	}
	175	#else
	176	static inline int spear_kbd_parse_dt(struct platform_device *pdev,
	177	struct spear_kbd *kbd)
	178	{
	179	return -ENOSYS;
	180	}
	181	#endif
	182
5298cc4c	183	static int spear_kbd_probe(struct platform_device *pdev)
829c4f96 VK	184	{
	185	struct kbd_platform_data *pdata = dev_get_platdata(&pdev->dev);
	186	const struct matrix_keymap_data *keymap = pdata ? pdata->keymap : NULL;
	187	struct spear_kbd *kbd;
	188	struct input_dev *input_dev;
	189	struct resource *res;
	190	int irq;
	191	int error;
	192
bc95df78 RK	193	irq = platform_get_irq(pdev, 0);
	194	if (irq < 0) {
	195	dev_err(&pdev->dev, "not able to get irq for the device\n");
	196	return irq;
	197	}
	198
6102752e VK	199	kbd = devm_kzalloc(&pdev->dev, sizeof(*kbd), GFP_KERNEL);
	200	if (!kbd) {
	201	dev_err(&pdev->dev, "not enough memory for driver data\n");
	202	return -ENOMEM;
	203	}
	204
	205	input_dev = devm_input_allocate_device(&pdev->dev);
	206	if (!input_dev) {
	207	dev_err(&pdev->dev, "unable to allocate input device\n");
	208	return -ENOMEM;
bc95df78 RK	209	}
	210
	211	kbd->input = input_dev;
	212	kbd->irq = irq;
829c4f96 VK	213
	214	if (!pdata) {
	215	error = spear_kbd_parse_dt(pdev, kbd);
	216	if (error)
6102752e	217	return error;
829c4f96 VK	218	} else {
	219	kbd->mode = pdata->mode;
	220	kbd->rep = pdata->rep;
8314f532	221	kbd->suspended_rate = pdata->suspended_rate;
829c4f96	222	}
f8354c60	223
ef0aca7f	224	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
8d1cbc98 TR	225	kbd->io_base = devm_ioremap_resource(&pdev->dev, res);
	226	if (IS_ERR(kbd->io_base))
	227	return PTR_ERR(kbd->io_base);
bc95df78	228
6102752e VK	229	kbd->clk = devm_clk_get(&pdev->dev, NULL);
	230	if (IS_ERR(kbd->clk))
	231	return PTR_ERR(kbd->clk);
bc95df78 RK	232
	233	input_dev->name = "Spear Keyboard";
	234	input_dev->phys = "keyboard/input0";
bc95df78 RK	235	input_dev->id.bustype = BUS_HOST;
	236	input_dev->id.vendor = 0x0001;
	237	input_dev->id.product = 0x0001;
	238	input_dev->id.version = 0x0100;
	239	input_dev->open = spear_kbd_open;
	240	input_dev->close = spear_kbd_close;
	241
1932811f DT	242	error = matrix_keypad_build_keymap(keymap, NULL, NUM_ROWS, NUM_COLS,
	243	kbd->keycodes, input_dev);
	244	if (error) {
	245	dev_err(&pdev->dev, "Failed to build keymap\n");
6102752e	246	return error;
1932811f DT	247	}
1932811f DT	248
829c4f96	249	if (kbd->rep)
bc95df78 RK	250	__set_bit(EV_REP, input_dev->evbit);
	251	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
	252
bc95df78 RK	253	input_set_drvdata(input_dev, kbd);
bc95df78 RK	254
6102752e VK	255	error = devm_request_irq(&pdev->dev, irq, spear_kbd_interrupt, 0,
6102752e VK	256	"keyboard", kbd);
bc95df78	257	if (error) {
6102752e VK	258	dev_err(&pdev->dev, "request_irq failed\n");
6102752e VK	259	return error;
bc95df78 RK	260	}
bc95df78 RK	261
93366489 VKS	262	error = clk_prepare(kbd->clk);
	263	if (error)
	264	return error;
	265
bc95df78 RK	266	error = input_register_device(input_dev);
	267	if (error) {
	268	dev_err(&pdev->dev, "Unable to register keyboard device\n");
93366489	269	clk_unprepare(kbd->clk);
6102752e	270	return error;
bc95df78 RK	271	}
	272
	273	device_init_wakeup(&pdev->dev, 1);
	274	platform_set_drvdata(pdev, kbd);
	275
	276	return 0;
bc95df78 RK	277	}
bc95df78 RK	278
e2619cf7	279	static int spear_kbd_remove(struct platform_device *pdev)
bc95df78	280	{
93366489 VKS	281	struct spear_kbd *kbd = platform_get_drvdata(pdev);
	282
	283	input_unregister_device(kbd->input);
	284	clk_unprepare(kbd->clk);
	285
5bdea835	286	device_init_wakeup(&pdev->dev, 0);
bc95df78 RK	287
	288	return 0;
	289	}
	290
7ffae990	291	static int __maybe_unused spear_kbd_suspend(struct device *dev)
bc95df78 RK	292	{
	293	struct platform_device *pdev = to_platform_device(dev);
	294	struct spear_kbd *kbd = platform_get_drvdata(pdev);
	295	struct input_dev *input_dev = kbd->input;
8314f532	296	unsigned int rate = 0, mode_ctl_reg, val;
bc95df78 RK	297
	298	mutex_lock(&input_dev->mutex);
	299
8314f532 SH	300	/* explicitly enable clock as we may program device */
	301	clk_enable(kbd->clk);
	302
	303	mode_ctl_reg = readl_relaxed(kbd->io_base + MODE_CTL_REG);
	304
53fe6285	305	if (device_may_wakeup(&pdev->dev)) {
1eee4af3 DS	306	if (!enable_irq_wake(kbd->irq))
1eee4af3 DS	307	kbd->irq_wake_enabled = true;
8314f532 SH	308
	309	/*
	310	* reprogram the keyboard operating frequency as on some
	311	* platform it may change during system suspended
	312	*/
	313	if (kbd->suspended_rate)
	314	rate = kbd->suspended_rate / 1000000 - 1;
	315	else
	316	rate = clk_get_rate(kbd->clk) / 1000000 - 1;
	317
	318	val = mode_ctl_reg &
	319	~(MODE_CTL_PCLK_FREQ_MSK << MODE_CTL_PCLK_FREQ_SHIFT);
	320	val \|= (rate & MODE_CTL_PCLK_FREQ_MSK)
	321	<< MODE_CTL_PCLK_FREQ_SHIFT;
	322	writel_relaxed(val, kbd->io_base + MODE_CTL_REG);
	323
53fe6285	324	} else {
8314f532 SH	325	if (input_dev->users) {
	326	writel_relaxed(mode_ctl_reg & ~MODE_CTL_START_SCAN,
	327	kbd->io_base + MODE_CTL_REG);
53fe6285	328	clk_disable(kbd->clk);
8314f532	329	}
53fe6285	330	}
bc95df78	331
8314f532 SH	332	/* store current configuration */
	333	if (input_dev->users)
	334	kbd->mode_ctl_reg = mode_ctl_reg;
	335
	336	/* restore previous clk state */
	337	clk_disable(kbd->clk);
	338
bc95df78 RK	339	mutex_unlock(&input_dev->mutex);
	340
	341	return 0;
	342	}
	343
7ffae990	344	static int __maybe_unused spear_kbd_resume(struct device *dev)
bc95df78 RK	345	{
	346	struct platform_device *pdev = to_platform_device(dev);
	347	struct spear_kbd *kbd = platform_get_drvdata(pdev);
	348	struct input_dev *input_dev = kbd->input;
	349
	350	mutex_lock(&input_dev->mutex);
	351
53fe6285	352	if (device_may_wakeup(&pdev->dev)) {
1eee4af3 DS	353	if (kbd->irq_wake_enabled) {
	354	kbd->irq_wake_enabled = false;
	355	disable_irq_wake(kbd->irq);
	356	}
53fe6285 SH	357	} else {
	358	if (input_dev->users)
	359	clk_enable(kbd->clk);
	360	}
bc95df78	361
8314f532 SH	362	/* restore current configuration */
	363	if (input_dev->users)
	364	writel_relaxed(kbd->mode_ctl_reg, kbd->io_base + MODE_CTL_REG);
	365
bc95df78 RK	366	mutex_unlock(&input_dev->mutex);
	367
	368	return 0;
	369	}
bc95df78	370
f79e30a8 VK	371	static SIMPLE_DEV_PM_OPS(spear_kbd_pm_ops, spear_kbd_suspend, spear_kbd_resume);
f79e30a8 VK	372
829c4f96 VK	373	#ifdef CONFIG_OF
	374	static const struct of_device_id spear_kbd_id_table[] = {
	375	{ .compatible = "st,spear300-kbd" },
	376	{}
	377	};
	378	MODULE_DEVICE_TABLE(of, spear_kbd_id_table);
	379	#endif
	380
bc95df78 RK	381	static struct platform_driver spear_kbd_driver = {
bc95df78 RK	382	.probe = spear_kbd_probe,
1cb0aa88	383	.remove = spear_kbd_remove,
bc95df78 RK	384	.driver = {
bc95df78 RK	385	.name = "keyboard",
bc95df78	386	.pm = &spear_kbd_pm_ops,
829c4f96	387	.of_match_table = of_match_ptr(spear_kbd_id_table),
bc95df78 RK	388	},
bc95df78 RK	389	};
5146c84f	390	module_platform_driver(spear_kbd_driver);
bc95df78 RK	391
	392	MODULE_AUTHOR("Rajeev Kumar");
	393	MODULE_DESCRIPTION("SPEAr Keyboard Driver");
	394	MODULE_LICENSE("GPL");