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

/*
 * Freescale MXS Low Resolution Analog-to-Digital Converter driver
 *
 * Copyright (c) 2012 DENX Software Engineering, GmbH.
 * Copyright (c) 2017 Ksenija Stanojevic <[email protected]>
 *
 * Authors:
 *  Marek Vasut <[email protected]>
 *  Ksenija Stanojevic <[email protected]>
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 */

#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;
			}
			/* fall through 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 <[email protected]>");
MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:mxs-lradc");
Commit	Line	Data
ead25133 KS	1	/*
	2	* Freescale MXS Low Resolution Analog-to-Digital Converter driver
	3	*
	4	* Copyright (c) 2012 DENX Software Engineering, GmbH.
	5	* Copyright (c) 2017 Ksenija Stanojevic <[email protected]>
	6	*
	7	* Authors:
	8	* Marek Vasut <[email protected]>
	9	* Ksenija Stanojevic <[email protected]>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*/
	21
	22	#include <linux/clk.h>
	23	#include <linux/device.h>
	24	#include <linux/mfd/core.h>
	25	#include <linux/mfd/mxs-lradc.h>
	26	#include <linux/module.h>
	27	#include <linux/of.h>
	28	#include <linux/of_device.h>
	29	#include <linux/platform_device.h>
	30	#include <linux/slab.h>
	31
	32	#define ADC_CELL 0
	33	#define TSC_CELL 1
	34	#define RES_MEM 0
	35
	36	enum mx23_lradc_irqs {
	37	MX23_LRADC_TS_IRQ = 0,
	38	MX23_LRADC_CH0_IRQ,
	39	MX23_LRADC_CH1_IRQ,
	40	MX23_LRADC_CH2_IRQ,
	41	MX23_LRADC_CH3_IRQ,
	42	MX23_LRADC_CH4_IRQ,
	43	MX23_LRADC_CH5_IRQ,
	44	MX23_LRADC_CH6_IRQ,
	45	MX23_LRADC_CH7_IRQ,
	46	};
	47
	48	enum mx28_lradc_irqs {
	49	MX28_LRADC_TS_IRQ = 0,
	50	MX28_LRADC_TRESH0_IRQ,
	51	MX28_LRADC_TRESH1_IRQ,
	52	MX28_LRADC_CH0_IRQ,
	53	MX28_LRADC_CH1_IRQ,
	54	MX28_LRADC_CH2_IRQ,
	55	MX28_LRADC_CH3_IRQ,
	56	MX28_LRADC_CH4_IRQ,
	57	MX28_LRADC_CH5_IRQ,
	58	MX28_LRADC_CH6_IRQ,
	59	MX28_LRADC_CH7_IRQ,
	60	MX28_LRADC_BUTTON0_IRQ,
	61	MX28_LRADC_BUTTON1_IRQ,
	62	};
	63
	64	static struct resource mx23_adc_resources[] = {
65	DEFINE_RES_MEM(0x0, 0x0),
66	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
67	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
68	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
69	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
70	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
71	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
72	};
73
74	static struct resource mx23_touchscreen_resources[] = {
75	DEFINE_RES_MEM(0x0, 0x0),
76	DEFINE_RES_IRQ_NAMED(MX23_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
77	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
78	DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
79	};
80
81	static struct resource mx28_adc_resources[] = {
82	DEFINE_RES_MEM(0x0, 0x0),
83	DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH0_IRQ, "mxs-lradc-thresh0"),
84	DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH1_IRQ, "mxs-lradc-thresh1"),
85	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
86	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
87	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
88	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
89	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
90	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
91	DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON0_IRQ, "mxs-lradc-button0"),
92	DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON1_IRQ, "mxs-lradc-button1"),
93	};
94
95	static struct resource mx28_touchscreen_resources[] = {
96	DEFINE_RES_MEM(0x0, 0x0),
97	DEFINE_RES_IRQ_NAMED(MX28_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
98	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
99	DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
100	};
101
102	static struct mfd_cell mx23_cells[] = {
103	{
104	.name = "mxs-lradc-adc",
105	.resources = mx23_adc_resources,
106	.num_resources = ARRAY_SIZE(mx23_adc_resources),
107	},
108	{
109	.name = "mxs-lradc-ts",
110	.resources = mx23_touchscreen_resources,
111	.num_resources = ARRAY_SIZE(mx23_touchscreen_resources),
112	},
113	};
114
115	static struct mfd_cell mx28_cells[] = {
116	{
117	.name = "mxs-lradc-adc",
118	.resources = mx28_adc_resources,
119	.num_resources = ARRAY_SIZE(mx28_adc_resources),
120	},
121	{
122	.name = "mxs-lradc-ts",
123	.resources = mx28_touchscreen_resources,
124	.num_resources = ARRAY_SIZE(mx28_touchscreen_resources),
125	}
126	};
127
128	static const struct of_device_id mxs_lradc_dt_ids[] = {
129	{ .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
130	{ .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
131	{ /* sentinel */ }
132	};
133	MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
134
135	static int mxs_lradc_probe(struct platform_device *pdev)
136	{
137	const struct of_device_id *of_id;
138	struct device *dev = &pdev->dev;
139	struct device_node *node = dev->of_node;
140	struct mxs_lradc *lradc;
141	struct mfd_cell *cells = NULL;
142	struct resource *res;
143	int ret = 0;
144	u32 ts_wires = 0;
145
146	lradc = devm_kzalloc(&pdev->dev, sizeof(*lradc), GFP_KERNEL);
147	if (!lradc)
148	return -ENOMEM;
149
150	of_id = of_match_device(mxs_lradc_dt_ids, &pdev->dev);
151	if (!of_id)
152	return -EINVAL;
153
154	lradc->soc = (enum mxs_lradc_id)of_id->data;
155
156	lradc->clk = devm_clk_get(&pdev->dev, NULL);
157	if (IS_ERR(lradc->clk)) {
158	dev_err(dev, "Failed to get the delay unit clock\n");
159	return PTR_ERR(lradc->clk);
160	}
161
162	ret = clk_prepare_enable(lradc->clk);
163	if (ret) {
164	dev_err(dev, "Failed to enable the delay unit clock\n");
165	return ret;
166	}
167
168	ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
169	&ts_wires);
170
171	if (!ret) {
172	lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
173
174	switch (ts_wires) {
175	case 4:
176	lradc->touchscreen_wire = MXS_LRADC_TOUCHSCREEN_4WIRE;
177	break;
178	case 5:
179	if (lradc->soc == IMX28_LRADC) {
180	lradc->touchscreen_wire =
181	MXS_LRADC_TOUCHSCREEN_5WIRE;
182	break;
183	}
184	/* fall through to an error message for i.MX23 */
185	default:
186	dev_err(&pdev->dev,
187	"Unsupported number of touchscreen wires (%d)\n"
188	, ts_wires);
189	ret = -EINVAL;
190	goto err_clk;
191	}
192	} else {
193	lradc->buffer_vchans = BUFFER_VCHANS_ALL;
194	}
195
196	platform_set_drvdata(pdev, lradc);
197
198	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
362741a2 AK	199	if (!res) {
	200	ret = -ENOMEM;
	201	goto err_clk;
	202	}
ead25133 KS	203
	204	switch (lradc->soc) {
	205	case IMX23_LRADC:
	206	mx23_adc_resources[RES_MEM] = *res;
	207	mx23_touchscreen_resources[RES_MEM] = *res;
	208	cells = mx23_cells;
	209	break;
	210	case IMX28_LRADC:
	211	mx28_adc_resources[RES_MEM] = *res;
	212	mx28_touchscreen_resources[RES_MEM] = *res;
	213	cells = mx28_cells;
	214	break;
	215	default:
	216	dev_err(dev, "Unsupported SoC\n");
	217	ret = -ENODEV;
	218	goto err_clk;
	219	}
	220
	221	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
	222	&cells[ADC_CELL], 1, NULL, 0, NULL);
	223	if (ret) {
	224	dev_err(&pdev->dev, "Failed to add the ADC subdevice\n");
	225	goto err_clk;
	226	}
	227
	228	if (!lradc->touchscreen_wire)
	229	return 0;
	230
	231	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
	232	&cells[TSC_CELL], 1, NULL, 0, NULL);
	233	if (ret) {
	234	dev_err(&pdev->dev,
	235	"Failed to add the touchscreen subdevice\n");
	236	goto err_clk;
	237	}
	238
	239	return 0;
	240
	241	err_clk:
	242	clk_disable_unprepare(lradc->clk);
	243
	244	return ret;
	245	}
	246
	247	static int mxs_lradc_remove(struct platform_device *pdev)
	248	{
	249	struct mxs_lradc *lradc = platform_get_drvdata(pdev);
	250
	251	clk_disable_unprepare(lradc->clk);
	252
	253	return 0;
	254	}
	255
	256	static struct platform_driver mxs_lradc_driver = {
	257	.driver = {
	258	.name = "mxs-lradc",
	259	.of_match_table = mxs_lradc_dt_ids,
	260	},
	261	.probe = mxs_lradc_probe,
	262	.remove = mxs_lradc_remove,
	263	};
	264	module_platform_driver(mxs_lradc_driver);
	265
	266	MODULE_AUTHOR("Ksenija Stanojevic <[email protected]>");
267	MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver");
268	MODULE_LICENSE("GPL");
269	MODULE_ALIAS("platform:mxs-lradc");