[linux-block.git] / drivers / mfd / mxs-lradc.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Freescale MXS Low Resolution Analog-to-Digital Converter driver
 *
 * Copyright (c) 2012 DENX Software Engineering, GmbH.
 * Copyright (c) 2017 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
 *
 * Authors:
 *  Marek Vasut <marex@denx.de>
 *  Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
 */

#include <linux/clk.h>
#include <linux/device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/mxs-lradc.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#define ADC_CELL		0
#define TSC_CELL		1
#define RES_MEM			0

enum mx23_lradc_irqs {
	MX23_LRADC_TS_IRQ = 0,
	MX23_LRADC_CH0_IRQ,
	MX23_LRADC_CH1_IRQ,
	MX23_LRADC_CH2_IRQ,
	MX23_LRADC_CH3_IRQ,
	MX23_LRADC_CH4_IRQ,
	MX23_LRADC_CH5_IRQ,
	MX23_LRADC_CH6_IRQ,
	MX23_LRADC_CH7_IRQ,
};

enum mx28_lradc_irqs {
	MX28_LRADC_TS_IRQ = 0,
	MX28_LRADC_TRESH0_IRQ,
	MX28_LRADC_TRESH1_IRQ,
	MX28_LRADC_CH0_IRQ,
	MX28_LRADC_CH1_IRQ,
	MX28_LRADC_CH2_IRQ,
	MX28_LRADC_CH3_IRQ,
	MX28_LRADC_CH4_IRQ,
	MX28_LRADC_CH5_IRQ,
	MX28_LRADC_CH6_IRQ,
	MX28_LRADC_CH7_IRQ,
	MX28_LRADC_BUTTON0_IRQ,
	MX28_LRADC_BUTTON1_IRQ,
};

static struct resource mx23_adc_resources[] = {
	DEFINE_RES_MEM(0x0, 0x0),
	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
};

static struct resource mx23_touchscreen_resources[] = {
	DEFINE_RES_MEM(0x0, 0x0),
	DEFINE_RES_IRQ_NAMED(MX23_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
};

static struct resource mx28_adc_resources[] = {
	DEFINE_RES_MEM(0x0, 0x0),
	DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH0_IRQ, "mxs-lradc-thresh0"),
	DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH1_IRQ, "mxs-lradc-thresh1"),
	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
	DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON0_IRQ, "mxs-lradc-button0"),
	DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON1_IRQ, "mxs-lradc-button1"),
};

static struct resource mx28_touchscreen_resources[] = {
	DEFINE_RES_MEM(0x0, 0x0),
	DEFINE_RES_IRQ_NAMED(MX28_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
};

static struct mfd_cell mx23_cells[] = {
	{
		.name = "mxs-lradc-adc",
		.resources = mx23_adc_resources,
		.num_resources = ARRAY_SIZE(mx23_adc_resources),
	},
	{
		.name = "mxs-lradc-ts",
		.resources = mx23_touchscreen_resources,
		.num_resources = ARRAY_SIZE(mx23_touchscreen_resources),
	},
};

static struct mfd_cell mx28_cells[] = {
	{
		.name = "mxs-lradc-adc",
		.resources = mx28_adc_resources,
		.num_resources = ARRAY_SIZE(mx28_adc_resources),
	},
	{
		.name = "mxs-lradc-ts",
		.resources = mx28_touchscreen_resources,
		.num_resources = ARRAY_SIZE(mx28_touchscreen_resources),
	}
};

static const struct of_device_id mxs_lradc_dt_ids[] = {
	{ .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
	{ .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);

static int mxs_lradc_probe(struct platform_device *pdev)
{
	const struct of_device_id *of_id;
	struct device *dev = &pdev->dev;
	struct device_node *node = dev->of_node;
	struct mxs_lradc *lradc;
	struct mfd_cell *cells = NULL;
	struct resource *res;
	int ret = 0;
	u32 ts_wires = 0;

	lradc = devm_kzalloc(&pdev->dev, sizeof(*lradc), GFP_KERNEL);
	if (!lradc)
		return -ENOMEM;

	of_id = of_match_device(mxs_lradc_dt_ids, &pdev->dev);
	if (!of_id)
		return -EINVAL;

	lradc->soc = (enum mxs_lradc_id)of_id->data;

	lradc->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(lradc->clk)) {
		dev_err(dev, "Failed to get the delay unit clock\n");
		return PTR_ERR(lradc->clk);
	}

	ret = clk_prepare_enable(lradc->clk);
	if (ret) {
		dev_err(dev, "Failed to enable the delay unit clock\n");
		return ret;
	}

	ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
					 &ts_wires);

	if (!ret) {
		lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;

		switch (ts_wires) {
		case 4:
			lradc->touchscreen_wire = MXS_LRADC_TOUCHSCREEN_4WIRE;
			break;
		case 5:
			if (lradc->soc == IMX28_LRADC) {
				lradc->touchscreen_wire =
					MXS_LRADC_TOUCHSCREEN_5WIRE;
				break;
			}
			fallthrough;	/* to an error message for i.MX23 */
		default:
			dev_err(&pdev->dev,
				"Unsupported number of touchscreen wires (%d)\n"
				, ts_wires);
			ret = -EINVAL;
			goto err_clk;
		}
	} else {
		lradc->buffer_vchans = BUFFER_VCHANS_ALL;
	}

	platform_set_drvdata(pdev, lradc);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		ret = -ENOMEM;
		goto err_clk;
	}

	switch (lradc->soc) {
	case IMX23_LRADC:
		mx23_adc_resources[RES_MEM] = *res;
		mx23_touchscreen_resources[RES_MEM] = *res;
		cells = mx23_cells;
		break;
	case IMX28_LRADC:
		mx28_adc_resources[RES_MEM] = *res;
		mx28_touchscreen_resources[RES_MEM] = *res;
		cells = mx28_cells;
		break;
	default:
		dev_err(dev, "Unsupported SoC\n");
		ret = -ENODEV;
		goto err_clk;
	}

	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
				   &cells[ADC_CELL], 1, NULL, 0, NULL);
	if (ret) {
		dev_err(&pdev->dev, "Failed to add the ADC subdevice\n");
		goto err_clk;
	}

	if (!lradc->touchscreen_wire)
		return 0;

	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
				   &cells[TSC_CELL], 1, NULL, 0, NULL);
	if (ret) {
		dev_err(&pdev->dev,
			"Failed to add the touchscreen subdevice\n");
		goto err_clk;
	}

	return 0;

err_clk:
	clk_disable_unprepare(lradc->clk);

	return ret;
}

static int mxs_lradc_remove(struct platform_device *pdev)
{
	struct mxs_lradc *lradc = platform_get_drvdata(pdev);

	clk_disable_unprepare(lradc->clk);

	return 0;
}

static struct platform_driver mxs_lradc_driver = {
	.driver = {
		.name = "mxs-lradc",
		.of_match_table = mxs_lradc_dt_ids,
	},
	.probe = mxs_lradc_probe,
	.remove = mxs_lradc_remove,
};
module_platform_driver(mxs_lradc_driver);

MODULE_AUTHOR("Ksenija Stanojevic <ksenija.stanojevic@gmail.com>");
MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:mxs-lradc");
Commit	Line	Data
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
ead25133 KS	2	/*
	3	* Freescale MXS Low Resolution Analog-to-Digital Converter driver
	4	*
	5	* Copyright (c) 2012 DENX Software Engineering, GmbH.
	6	* Copyright (c) 2017 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
	7	*
	8	* Authors:
	9	* Marek Vasut <marex@denx.de>
	10	* Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
ead25133 KS	11	*/
	12
	13	#include <linux/clk.h>
	14	#include <linux/device.h>
	15	#include <linux/mfd/core.h>
	16	#include <linux/mfd/mxs-lradc.h>
	17	#include <linux/module.h>
	18	#include <linux/of.h>
	19	#include <linux/of_device.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/slab.h>
	22
	23	#define ADC_CELL 0
	24	#define TSC_CELL 1
	25	#define RES_MEM 0
	26
	27	enum mx23_lradc_irqs {
	28	MX23_LRADC_TS_IRQ = 0,
	29	MX23_LRADC_CH0_IRQ,
	30	MX23_LRADC_CH1_IRQ,
	31	MX23_LRADC_CH2_IRQ,
	32	MX23_LRADC_CH3_IRQ,
	33	MX23_LRADC_CH4_IRQ,
	34	MX23_LRADC_CH5_IRQ,
	35	MX23_LRADC_CH6_IRQ,
	36	MX23_LRADC_CH7_IRQ,
	37	};
	38
	39	enum mx28_lradc_irqs {
	40	MX28_LRADC_TS_IRQ = 0,
	41	MX28_LRADC_TRESH0_IRQ,
	42	MX28_LRADC_TRESH1_IRQ,
	43	MX28_LRADC_CH0_IRQ,
	44	MX28_LRADC_CH1_IRQ,
	45	MX28_LRADC_CH2_IRQ,
	46	MX28_LRADC_CH3_IRQ,
	47	MX28_LRADC_CH4_IRQ,
	48	MX28_LRADC_CH5_IRQ,
	49	MX28_LRADC_CH6_IRQ,
	50	MX28_LRADC_CH7_IRQ,
	51	MX28_LRADC_BUTTON0_IRQ,
	52	MX28_LRADC_BUTTON1_IRQ,
	53	};
	54
	55	static struct resource mx23_adc_resources[] = {
	56	DEFINE_RES_MEM(0x0, 0x0),
	57	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
	58	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
	59	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
	60	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
	61	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
	62	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
	63	};
	64
	65	static struct resource mx23_touchscreen_resources[] = {
	66	DEFINE_RES_MEM(0x0, 0x0),
	67	DEFINE_RES_IRQ_NAMED(MX23_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
	68	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
	69	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
	70	};
	71
	72	static struct resource mx28_adc_resources[] = {
	73	DEFINE_RES_MEM(0x0, 0x0),
	74	DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH0_IRQ, "mxs-lradc-thresh0"),
75	DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH1_IRQ, "mxs-lradc-thresh1"),
76	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
77	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
78	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
79	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
80	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
81	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
82	DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON0_IRQ, "mxs-lradc-button0"),
83	DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON1_IRQ, "mxs-lradc-button1"),
84	};
85
86	static struct resource mx28_touchscreen_resources[] = {
87	DEFINE_RES_MEM(0x0, 0x0),
88	DEFINE_RES_IRQ_NAMED(MX28_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
89	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
90	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
91	};
92
93	static struct mfd_cell mx23_cells[] = {
94	{
95	.name = "mxs-lradc-adc",
96	.resources = mx23_adc_resources,
97	.num_resources = ARRAY_SIZE(mx23_adc_resources),
98	},
99	{
100	.name = "mxs-lradc-ts",
101	.resources = mx23_touchscreen_resources,
102	.num_resources = ARRAY_SIZE(mx23_touchscreen_resources),
103	},
104	};
105
106	static struct mfd_cell mx28_cells[] = {
107	{
108	.name = "mxs-lradc-adc",
109	.resources = mx28_adc_resources,
110	.num_resources = ARRAY_SIZE(mx28_adc_resources),
111	},
112	{
113	.name = "mxs-lradc-ts",
114	.resources = mx28_touchscreen_resources,
115	.num_resources = ARRAY_SIZE(mx28_touchscreen_resources),
116	}
117	};
118
119	static const struct of_device_id mxs_lradc_dt_ids[] = {
120	{ .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
121	{ .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
122	{ /* sentinel */ }
123	};
124	MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
125
126	static int mxs_lradc_probe(struct platform_device *pdev)
127	{
128	const struct of_device_id *of_id;
129	struct device *dev = &pdev->dev;
130	struct device_node *node = dev->of_node;
131	struct mxs_lradc *lradc;
132	struct mfd_cell *cells = NULL;
133	struct resource *res;
134	int ret = 0;
135	u32 ts_wires = 0;
136
137	lradc = devm_kzalloc(&pdev->dev, sizeof(*lradc), GFP_KERNEL);
138	if (!lradc)
139	return -ENOMEM;
140
141	of_id = of_match_device(mxs_lradc_dt_ids, &pdev->dev);
142	if (!of_id)
143	return -EINVAL;
144
145	lradc->soc = (enum mxs_lradc_id)of_id->data;
146
147	lradc->clk = devm_clk_get(&pdev->dev, NULL);
148	if (IS_ERR(lradc->clk)) {
149	dev_err(dev, "Failed to get the delay unit clock\n");
150	return PTR_ERR(lradc->clk);
151	}
152
153	ret = clk_prepare_enable(lradc->clk);
154	if (ret) {
155	dev_err(dev, "Failed to enable the delay unit clock\n");
156	return ret;
157	}
158
159	ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
160	&ts_wires);
161
162	if (!ret) {
163	lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
164
165	switch (ts_wires) {
166	case 4:
167	lradc->touchscreen_wire = MXS_LRADC_TOUCHSCREEN_4WIRE;
168	break;
169	case 5:
170	if (lradc->soc == IMX28_LRADC) {
171	lradc->touchscreen_wire =
172	MXS_LRADC_TOUCHSCREEN_5WIRE;
173	break;
174	}
df561f66	175	fallthrough; /* to an error message for i.MX23 */
ead25133 KS	176	default:
	177	dev_err(&pdev->dev,
	178	"Unsupported number of touchscreen wires (%d)\n"
	179	, ts_wires);
	180	ret = -EINVAL;
	181	goto err_clk;
	182	}
	183	} else {
	184	lradc->buffer_vchans = BUFFER_VCHANS_ALL;
	185	}
	186
	187	platform_set_drvdata(pdev, lradc);
	188
	189	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
362741a2 AK	190	if (!res) {
	191	ret = -ENOMEM;
	192	goto err_clk;
	193	}
ead25133 KS	194
	195	switch (lradc->soc) {
	196	case IMX23_LRADC:
	197	mx23_adc_resources[RES_MEM] = *res;
	198	mx23_touchscreen_resources[RES_MEM] = *res;
	199	cells = mx23_cells;
	200	break;
	201	case IMX28_LRADC:
	202	mx28_adc_resources[RES_MEM] = *res;
	203	mx28_touchscreen_resources[RES_MEM] = *res;
	204	cells = mx28_cells;
	205	break;
	206	default:
	207	dev_err(dev, "Unsupported SoC\n");
	208	ret = -ENODEV;
	209	goto err_clk;
	210	}
	211
	212	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
	213	&cells[ADC_CELL], 1, NULL, 0, NULL);
	214	if (ret) {
	215	dev_err(&pdev->dev, "Failed to add the ADC subdevice\n");
	216	goto err_clk;
	217	}
	218
	219	if (!lradc->touchscreen_wire)
	220	return 0;
	221
	222	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
	223	&cells[TSC_CELL], 1, NULL, 0, NULL);
	224	if (ret) {
	225	dev_err(&pdev->dev,
	226	"Failed to add the touchscreen subdevice\n");
	227	goto err_clk;
	228	}
	229
	230	return 0;
	231
	232	err_clk:
	233	clk_disable_unprepare(lradc->clk);
	234
	235	return ret;
	236	}
	237
	238	static int mxs_lradc_remove(struct platform_device *pdev)
	239	{
	240	struct mxs_lradc *lradc = platform_get_drvdata(pdev);
	241
	242	clk_disable_unprepare(lradc->clk);
	243
	244	return 0;
	245	}
	246
	247	static struct platform_driver mxs_lradc_driver = {
	248	.driver = {
	249	.name = "mxs-lradc",
	250	.of_match_table = mxs_lradc_dt_ids,
	251	},
	252	.probe = mxs_lradc_probe,
	253	.remove = mxs_lradc_remove,
	254	};
	255	module_platform_driver(mxs_lradc_driver);
	256
	257	MODULE_AUTHOR("Ksenija Stanojevic <ksenija.stanojevic@gmail.com>");
258	MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver");
259	MODULE_LICENSE("GPL");
260	MODULE_ALIAS("platform:mxs-lradc");