[linux-block.git] / drivers / mfd / ti_am335x_tscadc.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * TI Touch Screen / ADC MFD driver
 *
 * Copyright (C) 2012 Texas Instruments Incorporated - https://www.ti.com/
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/regmap.h>
#include <linux/mfd/core.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/sched.h>

#include <linux/mfd/ti_am335x_tscadc.h>

static const struct regmap_config tscadc_regmap_config = {
	.name = "ti_tscadc",
	.reg_bits = 32,
	.reg_stride = 4,
	.val_bits = 32,
};

void am335x_tsc_se_set_cache(struct ti_tscadc_dev *tscadc, u32 val)
{
	unsigned long flags;

	spin_lock_irqsave(&tscadc->reg_lock, flags);
	tscadc->reg_se_cache |= val;
	if (tscadc->adc_waiting)
		wake_up(&tscadc->reg_se_wait);
	else if (!tscadc->adc_in_use)
		regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);

	spin_unlock_irqrestore(&tscadc->reg_lock, flags);
}
EXPORT_SYMBOL_GPL(am335x_tsc_se_set_cache);

static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tscadc)
{
	DEFINE_WAIT(wait);
	u32 reg;

	regmap_read(tscadc->regmap, REG_ADCFSM, &reg);
	if (reg & SEQ_STATUS) {
		tscadc->adc_waiting = true;
		prepare_to_wait(&tscadc->reg_se_wait, &wait,
				TASK_UNINTERRUPTIBLE);
		spin_unlock_irq(&tscadc->reg_lock);

		schedule();

		spin_lock_irq(&tscadc->reg_lock);
		finish_wait(&tscadc->reg_se_wait, &wait);

		/*
		 * Sequencer should either be idle or
		 * busy applying the charge step.
		 */
		regmap_read(tscadc->regmap, REG_ADCFSM, &reg);
		WARN_ON((reg & SEQ_STATUS) && !(reg & CHARGE_STEP));
		tscadc->adc_waiting = false;
	}
	tscadc->adc_in_use = true;
}

void am335x_tsc_se_set_once(struct ti_tscadc_dev *tscadc, u32 val)
{
	spin_lock_irq(&tscadc->reg_lock);
	am335x_tscadc_need_adc(tscadc);

	regmap_write(tscadc->regmap, REG_SE, val);
	spin_unlock_irq(&tscadc->reg_lock);
}
EXPORT_SYMBOL_GPL(am335x_tsc_se_set_once);

void am335x_tsc_se_adc_done(struct ti_tscadc_dev *tscadc)
{
	unsigned long flags;

	spin_lock_irqsave(&tscadc->reg_lock, flags);
	tscadc->adc_in_use = false;
	regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);
	spin_unlock_irqrestore(&tscadc->reg_lock, flags);
}
EXPORT_SYMBOL_GPL(am335x_tsc_se_adc_done);

void am335x_tsc_se_clr(struct ti_tscadc_dev *tscadc, u32 val)
{
	unsigned long flags;

	spin_lock_irqsave(&tscadc->reg_lock, flags);
	tscadc->reg_se_cache &= ~val;
	regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);
	spin_unlock_irqrestore(&tscadc->reg_lock, flags);
}
EXPORT_SYMBOL_GPL(am335x_tsc_se_clr);

static void tscadc_idle_config(struct ti_tscadc_dev *tscadc)
{
	unsigned int idleconfig;

	idleconfig = STEPCONFIG_INM_ADCREFM | STEPCONFIG_INP_ADCREFM;
	if (ti_adc_with_touchscreen(tscadc))
		idleconfig |= STEPCONFIG_YNN | STEPCONFIG_YPN;

	regmap_write(tscadc->regmap, REG_IDLECONFIG, idleconfig);
}

static	int ti_tscadc_probe(struct platform_device *pdev)
{
	struct ti_tscadc_dev *tscadc;
	struct resource *res;
	struct clk *clk;
	struct device_node *node;
	struct mfd_cell *cell;
	bool use_tsc = false, use_mag = false;
	u32 val;
	int err;
	int tscmag_wires = 0, adc_channels = 0, cell_idx = 0, total_channels;
	int readouts = 0, mag_tracks = 0;

	/* Allocate memory for device */
	tscadc = devm_kzalloc(&pdev->dev, sizeof(*tscadc), GFP_KERNEL);
	if (!tscadc)
		return -ENOMEM;

	tscadc->dev = &pdev->dev;

	if (!pdev->dev.of_node) {
		dev_err(&pdev->dev, "Could not find valid DT data.\n");
		return -EINVAL;
	}

	tscadc->data = of_device_get_match_data(&pdev->dev);

	if (ti_adc_with_touchscreen(tscadc)) {
		node = of_get_child_by_name(pdev->dev.of_node, "tsc");
		of_property_read_u32(node, "ti,wires", &tscmag_wires);
		err = of_property_read_u32(node, "ti,coordinate-readouts",
					   &readouts);
		if (err < 0)
			of_property_read_u32(node, "ti,coordiante-readouts",
					     &readouts);

		of_node_put(node);

		if (tscmag_wires)
			use_tsc = true;
	} else {
		/*
		 * When adding support for the magnetic stripe reader, here is
		 * the place to look for the number of tracks used from device
		 * tree. Let's default to 0 for now.
		 */
		mag_tracks = 0;
		tscmag_wires = mag_tracks * 2;
		if (tscmag_wires)
			use_mag = true;
	}

	node = of_get_child_by_name(pdev->dev.of_node, "adc");
	of_property_for_each_u32(node, "ti,adc-channels", val) {
		adc_channels++;
		if (val > 7) {
			dev_err(&pdev->dev, " PIN numbers are 0..7 (not %d)\n",
				val);
			of_node_put(node);
			return -EINVAL;
		}
	}

	of_node_put(node);

	total_channels = tscmag_wires + adc_channels;
	if (total_channels > 8) {
		dev_err(&pdev->dev, "Number of i/p channels more than 8\n");
		return -EINVAL;
	}

	if (total_channels == 0) {
		dev_err(&pdev->dev, "Need at least one channel.\n");
		return -EINVAL;
	}

	if (use_tsc && (readouts * 2 + 2 + adc_channels > 16)) {
		dev_err(&pdev->dev, "Too many step configurations requested\n");
		return -EINVAL;
	}

	err = platform_get_irq(pdev, 0);
	if (err < 0)
		return err;
	else
		tscadc->irq = err;

	tscadc->tscadc_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
	if (IS_ERR(tscadc->tscadc_base))
		return PTR_ERR(tscadc->tscadc_base);

	tscadc->tscadc_phys_base = res->start;
	tscadc->regmap = devm_regmap_init_mmio(&pdev->dev,
					       tscadc->tscadc_base,
					       &tscadc_regmap_config);
	if (IS_ERR(tscadc->regmap)) {
		dev_err(&pdev->dev, "regmap init failed\n");
		return PTR_ERR(tscadc->regmap);
	}

	spin_lock_init(&tscadc->reg_lock);
	init_waitqueue_head(&tscadc->reg_se_wait);

	pm_runtime_enable(&pdev->dev);
	pm_runtime_get_sync(&pdev->dev);

	/*
	 * The TSC_ADC_Subsystem has 2 clock domains: OCP_CLK and ADC_CLK.
	 * ADCs produce a 12-bit sample every 15 ADC_CLK cycles.
	 * am33xx ADCs expect to capture 200ksps.
	 * am47xx ADCs expect to capture 867ksps.
	 * We need ADC clocks respectively running at 3MHz and 13MHz.
	 * These frequencies are valid since TSC_ADC_SS controller design
	 * assumes the OCP clock is at least 6x faster than the ADC clock.
	 */
	clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(clk)) {
		dev_err(&pdev->dev, "failed to get fck\n");
		err = PTR_ERR(clk);
		goto err_disable_clk;
	}

	tscadc->clk_div = (clk_get_rate(clk) / tscadc->data->target_clk_rate) - 1;
	regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div);

	/*
	 * Set the control register bits. tscadc->ctrl stores the configuration
	 * of the CTRL register but not the subsystem enable bit which must be
	 * added manually when timely.
	 */
	tscadc->ctrl = CNTRLREG_STEPID;
	if (ti_adc_with_touchscreen(tscadc)) {
		tscadc->ctrl |= CNTRLREG_TSC_STEPCONFIGWRT;
		if (use_tsc) {
			tscadc->ctrl |= CNTRLREG_TSC_ENB;
			if (tscmag_wires == 5)
				tscadc->ctrl |= CNTRLREG_TSC_5WIRE;
			else
				tscadc->ctrl |= CNTRLREG_TSC_4WIRE;
		}
	} else {
		tscadc->ctrl |= CNTRLREG_MAG_PREAMP_PWRDOWN |
				CNTRLREG_MAG_PREAMP_BYPASS;
	}
	regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl);

	tscadc_idle_config(tscadc);

	/* Enable the TSC module enable bit */
	regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl | CNTRLREG_SSENB);

	/* TSC or MAG Cell */
	if (use_tsc || use_mag) {
		cell = &tscadc->cells[cell_idx++];
		cell->name = tscadc->data->secondary_feature_name;
		cell->of_compatible = tscadc->data->secondary_feature_compatible;
		cell->platform_data = &tscadc;
		cell->pdata_size = sizeof(tscadc);
	}

	/* ADC Cell */
	if (adc_channels > 0) {
		cell = &tscadc->cells[cell_idx++];
		cell->name = tscadc->data->adc_feature_name;
		cell->of_compatible = tscadc->data->adc_feature_compatible;
		cell->platform_data = &tscadc;
		cell->pdata_size = sizeof(tscadc);
	}

	err = mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
			      tscadc->cells, cell_idx, NULL, 0, NULL);
	if (err < 0)
		goto err_disable_clk;

	platform_set_drvdata(pdev, tscadc);
	return 0;

err_disable_clk:
	pm_runtime_put_sync(&pdev->dev);
	pm_runtime_disable(&pdev->dev);

	return err;
}

static void ti_tscadc_remove(struct platform_device *pdev)
{
	struct ti_tscadc_dev *tscadc = platform_get_drvdata(pdev);

	regmap_write(tscadc->regmap, REG_SE, 0x00);

	pm_runtime_put_sync(&pdev->dev);
	pm_runtime_disable(&pdev->dev);

	mfd_remove_devices(tscadc->dev);
}

static int __maybe_unused ti_tscadc_can_wakeup(struct device *dev, void *data)
{
	return device_may_wakeup(dev);
}

static int __maybe_unused tscadc_suspend(struct device *dev)
{
	struct ti_tscadc_dev *tscadc = dev_get_drvdata(dev);

	regmap_write(tscadc->regmap, REG_SE, 0x00);
	if (device_for_each_child(dev, NULL, ti_tscadc_can_wakeup)) {
		u32 ctrl;

		regmap_read(tscadc->regmap, REG_CTRL, &ctrl);
		ctrl &= ~(CNTRLREG_POWERDOWN);
		ctrl |= CNTRLREG_SSENB;
		regmap_write(tscadc->regmap, REG_CTRL, ctrl);
	}
	pm_runtime_put_sync(dev);

	return 0;
}

static int __maybe_unused tscadc_resume(struct device *dev)
{
	struct ti_tscadc_dev *tscadc = dev_get_drvdata(dev);

	pm_runtime_get_sync(dev);

	regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div);
	regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl);
	tscadc_idle_config(tscadc);
	regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl | CNTRLREG_SSENB);

	return 0;
}

static SIMPLE_DEV_PM_OPS(tscadc_pm_ops, tscadc_suspend, tscadc_resume);

static const struct ti_tscadc_data tscdata = {
	.adc_feature_name = "TI-am335x-adc",
	.adc_feature_compatible = "ti,am3359-adc",
	.secondary_feature_name = "TI-am335x-tsc",
	.secondary_feature_compatible = "ti,am3359-tsc",
	.target_clk_rate = TSC_ADC_CLK,
};

static const struct ti_tscadc_data magdata = {
	.adc_feature_name = "TI-am43xx-adc",
	.adc_feature_compatible = "ti,am4372-adc",
	.secondary_feature_name = "TI-am43xx-mag",
	.secondary_feature_compatible = "ti,am4372-mag",
	.target_clk_rate = MAG_ADC_CLK,
};

static const struct of_device_id ti_tscadc_dt_ids[] = {
	{ .compatible = "ti,am3359-tscadc", .data = &tscdata },
	{ .compatible = "ti,am4372-magadc", .data = &magdata },
	{ }
};
MODULE_DEVICE_TABLE(of, ti_tscadc_dt_ids);

static struct platform_driver ti_tscadc_driver = {
	.driver = {
		.name   = "ti_am3359-tscadc",
		.pm	= &tscadc_pm_ops,
		.of_match_table = ti_tscadc_dt_ids,
	},
	.probe	= ti_tscadc_probe,
	.remove_new = ti_tscadc_remove,

};

module_platform_driver(ti_tscadc_driver);

MODULE_DESCRIPTION("TI touchscreen/magnetic stripe reader/ADC MFD controller driver");
MODULE_AUTHOR("Rachna Patil <rachna@ti.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
3bda759f	1	// SPDX-License-Identifier: GPL-2.0-only
01636eb9 PR	2	/*
	3	* TI Touch Screen / ADC MFD driver
	4	*
4f4ed454	5	* Copyright (C) 2012 Texas Instruments Incorporated - https://www.ti.com/
01636eb9 PR	6	*/
	7
	8	#include <linux/module.h>
01636eb9 PR	9	#include <linux/slab.h>
	10	#include <linux/err.h>
	11	#include <linux/io.h>
	12	#include <linux/clk.h>
	13	#include <linux/regmap.h>
	14	#include <linux/mfd/core.h>
	15	#include <linux/pm_runtime.h>
a6543a1c	16	#include <linux/of.h>
dc0c386e	17	#include <linux/platform_device.h>
7ca6740c	18	#include <linux/sched.h>
01636eb9 PR	19
	20	#include <linux/mfd/ti_am335x_tscadc.h>
	21
01636eb9 PR	22	static const struct regmap_config tscadc_regmap_config = {
	23	.name = "ti_tscadc",
	24	.reg_bits = 32,
	25	.reg_stride = 4,
	26	.val_bits = 32,
	27	};
	28
a318b7d0	29	void am335x_tsc_se_set_cache(struct ti_tscadc_dev *tscadc, u32 val)
abeccee4	30	{
317b2099 SAS	31	unsigned long flags;
317b2099 SAS	32
a318b7d0 AD	33	spin_lock_irqsave(&tscadc->reg_lock, flags);
	34	tscadc->reg_se_cache \|= val;
	35	if (tscadc->adc_waiting)
	36	wake_up(&tscadc->reg_se_wait);
	37	else if (!tscadc->adc_in_use)
0d3a7cce	38	regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);
7ca6740c	39
a318b7d0	40	spin_unlock_irqrestore(&tscadc->reg_lock, flags);
abeccee4	41	}
7e170c6e SAS	42	EXPORT_SYMBOL_GPL(am335x_tsc_se_set_cache);
7e170c6e SAS	43
a318b7d0	44	static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tscadc)
7ca6740c SAS	45	{
	46	DEFINE_WAIT(wait);
	47	u32 reg;
	48
0d3a7cce	49	regmap_read(tscadc->regmap, REG_ADCFSM, &reg);
7ca6740c	50	if (reg & SEQ_STATUS) {
a318b7d0 AD	51	tscadc->adc_waiting = true;
a318b7d0 AD	52	prepare_to_wait(&tscadc->reg_se_wait, &wait,
7ca6740c	53	TASK_UNINTERRUPTIBLE);
a318b7d0	54	spin_unlock_irq(&tscadc->reg_lock);
7ca6740c SAS	55
	56	schedule();
	57
a318b7d0 AD	58	spin_lock_irq(&tscadc->reg_lock);
a318b7d0 AD	59	finish_wait(&tscadc->reg_se_wait, &wait);
7ca6740c	60
b10848e6 V	61	/*
	62	* Sequencer should either be idle or
	63	* busy applying the charge step.
	64	*/
0d3a7cce	65	regmap_read(tscadc->regmap, REG_ADCFSM, &reg);
b10848e6	66	WARN_ON((reg & SEQ_STATUS) && !(reg & CHARGE_STEP));
a318b7d0	67	tscadc->adc_waiting = false;
7ca6740c	68	}
a318b7d0	69	tscadc->adc_in_use = true;
7ca6740c SAS	70	}
7ca6740c SAS	71
a318b7d0	72	void am335x_tsc_se_set_once(struct ti_tscadc_dev *tscadc, u32 val)
7ca6740c	73	{
a318b7d0 AD	74	spin_lock_irq(&tscadc->reg_lock);
a318b7d0 AD	75	am335x_tscadc_need_adc(tscadc);
7ca6740c	76
0d3a7cce	77	regmap_write(tscadc->regmap, REG_SE, val);
a318b7d0	78	spin_unlock_irq(&tscadc->reg_lock);
7ca6740c SAS	79	}
	80	EXPORT_SYMBOL_GPL(am335x_tsc_se_set_once);
	81
a318b7d0	82	void am335x_tsc_se_adc_done(struct ti_tscadc_dev *tscadc)
7e170c6e SAS	83	{
	84	unsigned long flags;
	85
a318b7d0 AD	86	spin_lock_irqsave(&tscadc->reg_lock, flags);
a318b7d0 AD	87	tscadc->adc_in_use = false;
0d3a7cce	88	regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);
a318b7d0	89	spin_unlock_irqrestore(&tscadc->reg_lock, flags);
7e170c6e	90	}
7ca6740c	91	EXPORT_SYMBOL_GPL(am335x_tsc_se_adc_done);
abeccee4	92
a318b7d0	93	void am335x_tsc_se_clr(struct ti_tscadc_dev *tscadc, u32 val)
abeccee4	94	{
317b2099 SAS	95	unsigned long flags;
317b2099 SAS	96
a318b7d0 AD	97	spin_lock_irqsave(&tscadc->reg_lock, flags);
a318b7d0 AD	98	tscadc->reg_se_cache &= ~val;
0d3a7cce	99	regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);
a318b7d0	100	spin_unlock_irqrestore(&tscadc->reg_lock, flags);
abeccee4 PR	101	}
	102	EXPORT_SYMBOL_GPL(am335x_tsc_se_clr);
	103
a318b7d0	104	static void tscadc_idle_config(struct ti_tscadc_dev *tscadc)
01636eb9 PR	105	{
	106	unsigned int idleconfig;
	107
bf0f394c MR	108	idleconfig = STEPCONFIG_INM_ADCREFM \| STEPCONFIG_INP_ADCREFM;
	109	if (ti_adc_with_touchscreen(tscadc))
	110	idleconfig \|= STEPCONFIG_YNN \| STEPCONFIG_YPN;
01636eb9	111
0d3a7cce	112	regmap_write(tscadc->regmap, REG_IDLECONFIG, idleconfig);
01636eb9 PR	113	}
01636eb9 PR	114
612b95cd	115	static int ti_tscadc_probe(struct platform_device *pdev)
01636eb9	116	{
36e48f07 MR	117	struct ti_tscadc_dev *tscadc;
	118	struct resource *res;
	119	struct clk *clk;
	120	struct device_node *node;
	121	struct mfd_cell *cell;
0a123303	122	bool use_tsc = false, use_mag = false;
36e48f07	123	u32 val;
b813f320	124	int err;
430b98fc	125	int tscmag_wires = 0, adc_channels = 0, cell_idx = 0, total_channels;
0a123303	126	int readouts = 0, mag_tracks = 0;
01636eb9	127
61479479 MR	128	/* Allocate memory for device */
	129	tscadc = devm_kzalloc(&pdev->dev, sizeof(*tscadc), GFP_KERNEL);
	130	if (!tscadc)
	131	return -ENOMEM;
	132
	133	tscadc->dev = &pdev->dev;
	134
9e5775f3 SAS	135	if (!pdev->dev.of_node) {
9e5775f3 SAS	136	dev_err(&pdev->dev, "Could not find valid DT data.\n");
01636eb9 PR	137	return -EINVAL;
	138	}
	139
f7834843 MR	140	tscadc->data = of_device_get_match_data(&pdev->dev);
f7834843 MR	141
bf0f394c MR	142	if (ti_adc_with_touchscreen(tscadc)) {
	143	node = of_get_child_by_name(pdev->dev.of_node, "tsc");
	144	of_property_read_u32(node, "ti,wires", &tscmag_wires);
90fc6ff4 MR	145	err = of_property_read_u32(node, "ti,coordinate-readouts",
	146	&readouts);
	147	if (err < 0)
	148	of_property_read_u32(node, "ti,coordiante-readouts",
	149	&readouts);
	150
bf0f394c	151	of_node_put(node);
90fc6ff4	152
bf0f394c MR	153	if (tscmag_wires)
bf0f394c MR	154	use_tsc = true;
0a123303 MR	155	} else {
	156	/*
	157	* When adding support for the magnetic stripe reader, here is
	158	* the place to look for the number of tracks used from device
	159	* tree. Let's default to 0 for now.
	160	*/
	161	mag_tracks = 0;
	162	tscmag_wires = mag_tracks * 2;
	163	if (tscmag_wires)
	164	use_mag = true;
bf0f394c	165	}
a6543a1c	166
9e5775f3	167	node = of_get_child_by_name(pdev->dev.of_node, "adc");
9722c3b6	168	of_property_for_each_u32(node, "ti,adc-channels", val) {
18926ede SAS	169	adc_channels++;
	170	if (val > 7) {
	171	dev_err(&pdev->dev, " PIN numbers are 0..7 (not %d)\n",
243e3cb9	172	val);
29f95e8b	173	of_node_put(node);
18926ede SAS	174	return -EINVAL;
	175	}
	176	}
29f95e8b MR	177
	178	of_node_put(node);
	179
430b98fc	180	total_channels = tscmag_wires + adc_channels;
5e53a69b PR	181	if (total_channels > 8) {
	182	dev_err(&pdev->dev, "Number of i/p channels more than 8\n");
	183	return -EINVAL;
	184	}
243e3cb9	185
24d5c82f	186	if (total_channels == 0) {
ad70c03f	187	dev_err(&pdev->dev, "Need at least one channel.\n");
24d5c82f PA	188	return -EINVAL;
24d5c82f PA	189	}
2b99bafa	190
2a4e333a	191	if (use_tsc && (readouts * 2 + 2 + adc_channels > 16)) {
18926ede SAS	192	dev_err(&pdev->dev, "Too many step configurations requested\n");
	193	return -EINVAL;
	194	}
	195
3c39c9c6	196	err = platform_get_irq(pdev, 0);
bc239d8d	197	if (err < 0)
287ee127	198	return err;
bc239d8d	199	else
3c39c9c6	200	tscadc->irq = err;
01636eb9	201
07141cfe	202	tscadc->tscadc_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
924ff918 JH	203	if (IS_ERR(tscadc->tscadc_base))
924ff918 JH	204	return PTR_ERR(tscadc->tscadc_base);
01636eb9	205
de98a43e	206	tscadc->tscadc_phys_base = res->start;
0d3a7cce	207	tscadc->regmap = devm_regmap_init_mmio(&pdev->dev,
243e3cb9 MR	208	tscadc->tscadc_base,
243e3cb9 MR	209	&tscadc_regmap_config);
0d3a7cce	210	if (IS_ERR(tscadc->regmap)) {
01636eb9	211	dev_err(&pdev->dev, "regmap init failed\n");
287ee127	212	return PTR_ERR(tscadc->regmap);
01636eb9 PR	213	}
01636eb9 PR	214
abeccee4	215	spin_lock_init(&tscadc->reg_lock);
7ca6740c SAS	216	init_waitqueue_head(&tscadc->reg_se_wait);
7ca6740c SAS	217
01636eb9 PR	218	pm_runtime_enable(&pdev->dev);
	219	pm_runtime_get_sync(&pdev->dev);
	220
	221	/*
c4359f75 MR	222	* The TSC_ADC_Subsystem has 2 clock domains: OCP_CLK and ADC_CLK.
	223	* ADCs produce a 12-bit sample every 15 ADC_CLK cycles.
	224	* am33xx ADCs expect to capture 200ksps.
0a123303 MR	225	* am47xx ADCs expect to capture 867ksps.
	226	* We need ADC clocks respectively running at 3MHz and 13MHz.
	227	* These frequencies are valid since TSC_ADC_SS controller design
c4359f75	228	* assumes the OCP clock is at least 6x faster than the ADC clock.
01636eb9	229	*/
235a96e9	230	clk = devm_clk_get(&pdev->dev, NULL);
01636eb9	231	if (IS_ERR(clk)) {
e40b5971	232	dev_err(&pdev->dev, "failed to get fck\n");
01636eb9 PR	233	err = PTR_ERR(clk);
	234	goto err_disable_clk;
	235	}
efe3126a	236
f7834843	237	tscadc->clk_div = (clk_get_rate(clk) / tscadc->data->target_clk_rate) - 1;
0d3a7cce	238	regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div);
01636eb9	239
b813f320 MR	240	/*
	241	* Set the control register bits. tscadc->ctrl stores the configuration
	242	* of the CTRL register but not the subsystem enable bit which must be
	243	* added manually when timely.
	244	*/
bf0f394c MR	245	tscadc->ctrl = CNTRLREG_STEPID;
	246	if (ti_adc_with_touchscreen(tscadc)) {
	247	tscadc->ctrl \|= CNTRLREG_TSC_STEPCONFIGWRT;
	248	if (use_tsc) {
	249	tscadc->ctrl \|= CNTRLREG_TSC_ENB;
	250	if (tscmag_wires == 5)
	251	tscadc->ctrl \|= CNTRLREG_TSC_5WIRE;
	252	else
	253	tscadc->ctrl \|= CNTRLREG_TSC_4WIRE;
	254	}
0a123303 MR	255	} else {
	256	tscadc->ctrl \|= CNTRLREG_MAG_PREAMP_PWRDOWN \|
	257	CNTRLREG_MAG_PREAMP_BYPASS;
f0933a60	258	}
b813f320	259	regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl);
01636eb9	260
25b15d04 MR	261	tscadc_idle_config(tscadc);
25b15d04 MR	262
01636eb9	263	/* Enable the TSC module enable bit */
c3e36b5d	264	regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl \| CNTRLREG_SSENB);
01636eb9	265
0a123303 MR	266	/* TSC or MAG Cell */
0a123303 MR	267	if (use_tsc \|\| use_mag) {
7c605802	268	cell = &tscadc->cells[cell_idx++];
f7834843 MR	269	cell->name = tscadc->data->secondary_feature_name;
f7834843 MR	270	cell->of_compatible = tscadc->data->secondary_feature_compatible;
24d5c82f PA	271	cell->platform_data = &tscadc;
	272	cell->pdata_size = sizeof(tscadc);
	273	}
2b99bafa	274
5e53a69b	275	/* ADC Cell */
24d5c82f	276	if (adc_channels > 0) {
7c605802	277	cell = &tscadc->cells[cell_idx++];
f7834843 MR	278	cell->name = tscadc->data->adc_feature_name;
f7834843 MR	279	cell->of_compatible = tscadc->data->adc_feature_compatible;
24d5c82f PA	280	cell->platform_data = &tscadc;
	281	cell->pdata_size = sizeof(tscadc);
	282	}
5e53a69b	283
b40ee006	284	err = mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
7c605802	285	tscadc->cells, cell_idx, NULL, 0, NULL);
01636eb9 PR	286	if (err < 0)
	287	goto err_disable_clk;
	288
01636eb9	289	platform_set_drvdata(pdev, tscadc);
01636eb9 PR	290	return 0;
	291
	292	err_disable_clk:
	293	pm_runtime_put_sync(&pdev->dev);
	294	pm_runtime_disable(&pdev->dev);
287ee127	295
01636eb9 PR	296	return err;
	297	}
	298
740ad6d1	299	static void ti_tscadc_remove(struct platform_device *pdev)
01636eb9	300	{
36e48f07	301	struct ti_tscadc_dev *tscadc = platform_get_drvdata(pdev);
01636eb9	302
0d3a7cce	303	regmap_write(tscadc->regmap, REG_SE, 0x00);
01636eb9 PR	304
	305	pm_runtime_put_sync(&pdev->dev);
	306	pm_runtime_disable(&pdev->dev);
	307
	308	mfd_remove_devices(tscadc->dev);
01636eb9 PR	309	}
01636eb9 PR	310
c974ac77 V	311	static int __maybe_unused ti_tscadc_can_wakeup(struct device dev, void data)
	312	{
	313	return device_may_wakeup(dev);
	314	}
	315
dae936a0	316	static int __maybe_unused tscadc_suspend(struct device *dev)
01636eb9	317	{
36e48f07	318	struct ti_tscadc_dev *tscadc = dev_get_drvdata(dev);
01636eb9	319
0d3a7cce	320	regmap_write(tscadc->regmap, REG_SE, 0x00);
c974ac77 V	321	if (device_for_each_child(dev, NULL, ti_tscadc_can_wakeup)) {
	322	u32 ctrl;
	323
	324	regmap_read(tscadc->regmap, REG_CTRL, &ctrl);
	325	ctrl &= ~(CNTRLREG_POWERDOWN);
c3e36b5d	326	ctrl \|= CNTRLREG_SSENB;
c974ac77 V	327	regmap_write(tscadc->regmap, REG_CTRL, ctrl);
c974ac77 V	328	}
01636eb9 PR	329	pm_runtime_put_sync(dev);
	330
	331	return 0;
	332	}
	333
dae936a0	334	static int __maybe_unused tscadc_resume(struct device *dev)
01636eb9	335	{
36e48f07	336	struct ti_tscadc_dev *tscadc = dev_get_drvdata(dev);
01636eb9 PR	337
	338	pm_runtime_get_sync(dev);
	339
3dafbe93	340	regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div);
b813f320	341	regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl);
25b15d04	342	tscadc_idle_config(tscadc);
c3e36b5d	343	regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl \| CNTRLREG_SSENB);
01636eb9 PR	344
	345	return 0;
	346	}
	347
dae936a0	348	static SIMPLE_DEV_PM_OPS(tscadc_pm_ops, tscadc_suspend, tscadc_resume);
01636eb9	349
f7834843 MR	350	static const struct ti_tscadc_data tscdata = {
	351	.adc_feature_name = "TI-am335x-adc",
	352	.adc_feature_compatible = "ti,am3359-adc",
	353	.secondary_feature_name = "TI-am335x-tsc",
	354	.secondary_feature_compatible = "ti,am3359-tsc",
2f89c261	355	.target_clk_rate = TSC_ADC_CLK,
f7834843 MR	356	};
f7834843 MR	357
0a123303 MR	358	static const struct ti_tscadc_data magdata = {
	359	.adc_feature_name = "TI-am43xx-adc",
	360	.adc_feature_compatible = "ti,am4372-adc",
	361	.secondary_feature_name = "TI-am43xx-mag",
	362	.secondary_feature_compatible = "ti,am4372-mag",
	363	.target_clk_rate = MAG_ADC_CLK,
	364	};
	365
a6543a1c	366	static const struct of_device_id ti_tscadc_dt_ids[] = {
f7834843	367	{ .compatible = "ti,am3359-tscadc", .data = &tscdata },
0a123303	368	{ .compatible = "ti,am4372-magadc", .data = &magdata },
a6543a1c PR	369	{ }
	370	};
	371	MODULE_DEVICE_TABLE(of, ti_tscadc_dt_ids);
	372
01636eb9 PR	373	static struct platform_driver ti_tscadc_driver = {
01636eb9 PR	374	.driver = {
a6543a1c	375	.name = "ti_am3359-tscadc",
dae936a0	376	.pm = &tscadc_pm_ops,
131221bc	377	.of_match_table = ti_tscadc_dt_ids,
01636eb9 PR	378	},
01636eb9 PR	379	.probe = ti_tscadc_probe,
740ad6d1	380	.remove_new = ti_tscadc_remove,
01636eb9 PR	381
	382	};
	383
	384	module_platform_driver(ti_tscadc_driver);
	385
0a123303	386	MODULE_DESCRIPTION("TI touchscreen/magnetic stripe reader/ADC MFD controller driver");
01636eb9 PR	387	MODULE_AUTHOR("Rachna Patil <rachna@ti.com>");
01636eb9 PR	388	MODULE_LICENSE("GPL");