1c942fddfSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
2ead25133SKsenija Stanojevic /*
3ead25133SKsenija Stanojevic * Freescale MXS Low Resolution Analog-to-Digital Converter driver
4ead25133SKsenija Stanojevic *
5ead25133SKsenija Stanojevic * Copyright (c) 2012 DENX Software Engineering, GmbH.
6ead25133SKsenija Stanojevic * Copyright (c) 2017 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
7ead25133SKsenija Stanojevic *
8ead25133SKsenija Stanojevic * Authors:
9ead25133SKsenija Stanojevic * Marek Vasut <marex@denx.de>
10ead25133SKsenija Stanojevic * Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
11ead25133SKsenija Stanojevic */
12ead25133SKsenija Stanojevic
13ead25133SKsenija Stanojevic #include <linux/clk.h>
14ead25133SKsenija Stanojevic #include <linux/device.h>
15ead25133SKsenija Stanojevic #include <linux/mfd/core.h>
16ead25133SKsenija Stanojevic #include <linux/mfd/mxs-lradc.h>
17ead25133SKsenija Stanojevic #include <linux/module.h>
18ead25133SKsenija Stanojevic #include <linux/of.h>
19ead25133SKsenija Stanojevic #include <linux/of_device.h>
20ead25133SKsenija Stanojevic #include <linux/platform_device.h>
21ead25133SKsenija Stanojevic #include <linux/slab.h>
22ead25133SKsenija Stanojevic
23ead25133SKsenija Stanojevic #define ADC_CELL 0
24ead25133SKsenija Stanojevic #define TSC_CELL 1
25ead25133SKsenija Stanojevic #define RES_MEM 0
26ead25133SKsenija Stanojevic
27ead25133SKsenija Stanojevic enum mx23_lradc_irqs {
28ead25133SKsenija Stanojevic MX23_LRADC_TS_IRQ = 0,
29ead25133SKsenija Stanojevic MX23_LRADC_CH0_IRQ,
30ead25133SKsenija Stanojevic MX23_LRADC_CH1_IRQ,
31ead25133SKsenija Stanojevic MX23_LRADC_CH2_IRQ,
32ead25133SKsenija Stanojevic MX23_LRADC_CH3_IRQ,
33ead25133SKsenija Stanojevic MX23_LRADC_CH4_IRQ,
34ead25133SKsenija Stanojevic MX23_LRADC_CH5_IRQ,
35ead25133SKsenija Stanojevic MX23_LRADC_CH6_IRQ,
36ead25133SKsenija Stanojevic MX23_LRADC_CH7_IRQ,
37ead25133SKsenija Stanojevic };
38ead25133SKsenija Stanojevic
39ead25133SKsenija Stanojevic enum mx28_lradc_irqs {
40ead25133SKsenija Stanojevic MX28_LRADC_TS_IRQ = 0,
41ead25133SKsenija Stanojevic MX28_LRADC_TRESH0_IRQ,
42ead25133SKsenija Stanojevic MX28_LRADC_TRESH1_IRQ,
43ead25133SKsenija Stanojevic MX28_LRADC_CH0_IRQ,
44ead25133SKsenija Stanojevic MX28_LRADC_CH1_IRQ,
45ead25133SKsenija Stanojevic MX28_LRADC_CH2_IRQ,
46ead25133SKsenija Stanojevic MX28_LRADC_CH3_IRQ,
47ead25133SKsenija Stanojevic MX28_LRADC_CH4_IRQ,
48ead25133SKsenija Stanojevic MX28_LRADC_CH5_IRQ,
49ead25133SKsenija Stanojevic MX28_LRADC_CH6_IRQ,
50ead25133SKsenija Stanojevic MX28_LRADC_CH7_IRQ,
51ead25133SKsenija Stanojevic MX28_LRADC_BUTTON0_IRQ,
52ead25133SKsenija Stanojevic MX28_LRADC_BUTTON1_IRQ,
53ead25133SKsenija Stanojevic };
54ead25133SKsenija Stanojevic
55ead25133SKsenija Stanojevic static struct resource mx23_adc_resources[] = {
56ead25133SKsenija Stanojevic DEFINE_RES_MEM(0x0, 0x0),
57ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
58ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
59ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
60ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
61ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
62ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
63ead25133SKsenija Stanojevic };
64ead25133SKsenija Stanojevic
65ead25133SKsenija Stanojevic static struct resource mx23_touchscreen_resources[] = {
66ead25133SKsenija Stanojevic DEFINE_RES_MEM(0x0, 0x0),
67ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX23_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
68ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
69ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
70ead25133SKsenija Stanojevic };
71ead25133SKsenija Stanojevic
72ead25133SKsenija Stanojevic static struct resource mx28_adc_resources[] = {
73ead25133SKsenija Stanojevic DEFINE_RES_MEM(0x0, 0x0),
74ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH0_IRQ, "mxs-lradc-thresh0"),
75ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH1_IRQ, "mxs-lradc-thresh1"),
76ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
77ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
78ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
79ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
80ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
81ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
82ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON0_IRQ, "mxs-lradc-button0"),
83ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON1_IRQ, "mxs-lradc-button1"),
84ead25133SKsenija Stanojevic };
85ead25133SKsenija Stanojevic
86ead25133SKsenija Stanojevic static struct resource mx28_touchscreen_resources[] = {
87ead25133SKsenija Stanojevic DEFINE_RES_MEM(0x0, 0x0),
88ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX28_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
89ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
90ead25133SKsenija Stanojevic DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
91ead25133SKsenija Stanojevic };
92ead25133SKsenija Stanojevic
93ead25133SKsenija Stanojevic static struct mfd_cell mx23_cells[] = {
94ead25133SKsenija Stanojevic {
95ead25133SKsenija Stanojevic .name = "mxs-lradc-adc",
96ead25133SKsenija Stanojevic .resources = mx23_adc_resources,
97ead25133SKsenija Stanojevic .num_resources = ARRAY_SIZE(mx23_adc_resources),
98ead25133SKsenija Stanojevic },
99ead25133SKsenija Stanojevic {
100ead25133SKsenija Stanojevic .name = "mxs-lradc-ts",
101ead25133SKsenija Stanojevic .resources = mx23_touchscreen_resources,
102ead25133SKsenija Stanojevic .num_resources = ARRAY_SIZE(mx23_touchscreen_resources),
103ead25133SKsenija Stanojevic },
104ead25133SKsenija Stanojevic };
105ead25133SKsenija Stanojevic
106ead25133SKsenija Stanojevic static struct mfd_cell mx28_cells[] = {
107ead25133SKsenija Stanojevic {
108ead25133SKsenija Stanojevic .name = "mxs-lradc-adc",
109ead25133SKsenija Stanojevic .resources = mx28_adc_resources,
110ead25133SKsenija Stanojevic .num_resources = ARRAY_SIZE(mx28_adc_resources),
111ead25133SKsenija Stanojevic },
112ead25133SKsenija Stanojevic {
113ead25133SKsenija Stanojevic .name = "mxs-lradc-ts",
114ead25133SKsenija Stanojevic .resources = mx28_touchscreen_resources,
115ead25133SKsenija Stanojevic .num_resources = ARRAY_SIZE(mx28_touchscreen_resources),
116ead25133SKsenija Stanojevic }
117ead25133SKsenija Stanojevic };
118ead25133SKsenija Stanojevic
119ead25133SKsenija Stanojevic static const struct of_device_id mxs_lradc_dt_ids[] = {
120ead25133SKsenija Stanojevic { .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
121ead25133SKsenija Stanojevic { .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
122ead25133SKsenija Stanojevic { /* sentinel */ }
123ead25133SKsenija Stanojevic };
124ead25133SKsenija Stanojevic MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
125ead25133SKsenija Stanojevic
mxs_lradc_probe(struct platform_device * pdev)126ead25133SKsenija Stanojevic static int mxs_lradc_probe(struct platform_device *pdev)
127ead25133SKsenija Stanojevic {
128ead25133SKsenija Stanojevic const struct of_device_id *of_id;
129ead25133SKsenija Stanojevic struct device *dev = &pdev->dev;
130ead25133SKsenija Stanojevic struct device_node *node = dev->of_node;
131ead25133SKsenija Stanojevic struct mxs_lradc *lradc;
132ead25133SKsenija Stanojevic struct mfd_cell *cells = NULL;
133ead25133SKsenija Stanojevic struct resource *res;
134ead25133SKsenija Stanojevic int ret = 0;
135ead25133SKsenija Stanojevic u32 ts_wires = 0;
136ead25133SKsenija Stanojevic
137ead25133SKsenija Stanojevic lradc = devm_kzalloc(&pdev->dev, sizeof(*lradc), GFP_KERNEL);
138ead25133SKsenija Stanojevic if (!lradc)
139ead25133SKsenija Stanojevic return -ENOMEM;
140ead25133SKsenija Stanojevic
141ead25133SKsenija Stanojevic of_id = of_match_device(mxs_lradc_dt_ids, &pdev->dev);
142ead25133SKsenija Stanojevic if (!of_id)
143ead25133SKsenija Stanojevic return -EINVAL;
144ead25133SKsenija Stanojevic
145*367124ebSKrzysztof Kozlowski lradc->soc = (uintptr_t)of_id->data;
146ead25133SKsenija Stanojevic
147ead25133SKsenija Stanojevic lradc->clk = devm_clk_get(&pdev->dev, NULL);
148ead25133SKsenija Stanojevic if (IS_ERR(lradc->clk)) {
149ead25133SKsenija Stanojevic dev_err(dev, "Failed to get the delay unit clock\n");
150ead25133SKsenija Stanojevic return PTR_ERR(lradc->clk);
151ead25133SKsenija Stanojevic }
152ead25133SKsenija Stanojevic
153ead25133SKsenija Stanojevic ret = clk_prepare_enable(lradc->clk);
154ead25133SKsenija Stanojevic if (ret) {
155ead25133SKsenija Stanojevic dev_err(dev, "Failed to enable the delay unit clock\n");
156ead25133SKsenija Stanojevic return ret;
157ead25133SKsenija Stanojevic }
158ead25133SKsenija Stanojevic
159ead25133SKsenija Stanojevic ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
160ead25133SKsenija Stanojevic &ts_wires);
161ead25133SKsenija Stanojevic
162ead25133SKsenija Stanojevic if (!ret) {
163ead25133SKsenija Stanojevic lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
164ead25133SKsenija Stanojevic
165ead25133SKsenija Stanojevic switch (ts_wires) {
166ead25133SKsenija Stanojevic case 4:
167ead25133SKsenija Stanojevic lradc->touchscreen_wire = MXS_LRADC_TOUCHSCREEN_4WIRE;
168ead25133SKsenija Stanojevic break;
169ead25133SKsenija Stanojevic case 5:
170ead25133SKsenija Stanojevic if (lradc->soc == IMX28_LRADC) {
171ead25133SKsenija Stanojevic lradc->touchscreen_wire =
172ead25133SKsenija Stanojevic MXS_LRADC_TOUCHSCREEN_5WIRE;
173ead25133SKsenija Stanojevic break;
174ead25133SKsenija Stanojevic }
175df561f66SGustavo A. R. Silva fallthrough; /* to an error message for i.MX23 */
176ead25133SKsenija Stanojevic default:
177ead25133SKsenija Stanojevic dev_err(&pdev->dev,
178ead25133SKsenija Stanojevic "Unsupported number of touchscreen wires (%d)\n"
179ead25133SKsenija Stanojevic , ts_wires);
180ead25133SKsenija Stanojevic ret = -EINVAL;
181ead25133SKsenija Stanojevic goto err_clk;
182ead25133SKsenija Stanojevic }
183ead25133SKsenija Stanojevic } else {
184ead25133SKsenija Stanojevic lradc->buffer_vchans = BUFFER_VCHANS_ALL;
185ead25133SKsenija Stanojevic }
186ead25133SKsenija Stanojevic
187ead25133SKsenija Stanojevic platform_set_drvdata(pdev, lradc);
188ead25133SKsenija Stanojevic
189ead25133SKsenija Stanojevic res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
190362741a2SAlexey Khoroshilov if (!res) {
191362741a2SAlexey Khoroshilov ret = -ENOMEM;
192362741a2SAlexey Khoroshilov goto err_clk;
193362741a2SAlexey Khoroshilov }
194ead25133SKsenija Stanojevic
195ead25133SKsenija Stanojevic switch (lradc->soc) {
196ead25133SKsenija Stanojevic case IMX23_LRADC:
197ead25133SKsenija Stanojevic mx23_adc_resources[RES_MEM] = *res;
198ead25133SKsenija Stanojevic mx23_touchscreen_resources[RES_MEM] = *res;
199ead25133SKsenija Stanojevic cells = mx23_cells;
200ead25133SKsenija Stanojevic break;
201ead25133SKsenija Stanojevic case IMX28_LRADC:
202ead25133SKsenija Stanojevic mx28_adc_resources[RES_MEM] = *res;
203ead25133SKsenija Stanojevic mx28_touchscreen_resources[RES_MEM] = *res;
204ead25133SKsenija Stanojevic cells = mx28_cells;
205ead25133SKsenija Stanojevic break;
206ead25133SKsenija Stanojevic default:
207ead25133SKsenija Stanojevic dev_err(dev, "Unsupported SoC\n");
208ead25133SKsenija Stanojevic ret = -ENODEV;
209ead25133SKsenija Stanojevic goto err_clk;
210ead25133SKsenija Stanojevic }
211ead25133SKsenija Stanojevic
212ead25133SKsenija Stanojevic ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
213ead25133SKsenija Stanojevic &cells[ADC_CELL], 1, NULL, 0, NULL);
214ead25133SKsenija Stanojevic if (ret) {
215ead25133SKsenija Stanojevic dev_err(&pdev->dev, "Failed to add the ADC subdevice\n");
216ead25133SKsenija Stanojevic goto err_clk;
217ead25133SKsenija Stanojevic }
218ead25133SKsenija Stanojevic
219ead25133SKsenija Stanojevic if (!lradc->touchscreen_wire)
220ead25133SKsenija Stanojevic return 0;
221ead25133SKsenija Stanojevic
222ead25133SKsenija Stanojevic ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
223ead25133SKsenija Stanojevic &cells[TSC_CELL], 1, NULL, 0, NULL);
224ead25133SKsenija Stanojevic if (ret) {
225ead25133SKsenija Stanojevic dev_err(&pdev->dev,
226ead25133SKsenija Stanojevic "Failed to add the touchscreen subdevice\n");
227ead25133SKsenija Stanojevic goto err_clk;
228ead25133SKsenija Stanojevic }
229ead25133SKsenija Stanojevic
230ead25133SKsenija Stanojevic return 0;
231ead25133SKsenija Stanojevic
232ead25133SKsenija Stanojevic err_clk:
233ead25133SKsenija Stanojevic clk_disable_unprepare(lradc->clk);
234ead25133SKsenija Stanojevic
235ead25133SKsenija Stanojevic return ret;
236ead25133SKsenija Stanojevic }
237ead25133SKsenija Stanojevic
mxs_lradc_remove(struct platform_device * pdev)238ead25133SKsenija Stanojevic static int mxs_lradc_remove(struct platform_device *pdev)
239ead25133SKsenija Stanojevic {
240ead25133SKsenija Stanojevic struct mxs_lradc *lradc = platform_get_drvdata(pdev);
241ead25133SKsenija Stanojevic
242ead25133SKsenija Stanojevic clk_disable_unprepare(lradc->clk);
243ead25133SKsenija Stanojevic
244ead25133SKsenija Stanojevic return 0;
245ead25133SKsenija Stanojevic }
246ead25133SKsenija Stanojevic
247ead25133SKsenija Stanojevic static struct platform_driver mxs_lradc_driver = {
248ead25133SKsenija Stanojevic .driver = {
249ead25133SKsenija Stanojevic .name = "mxs-lradc",
250ead25133SKsenija Stanojevic .of_match_table = mxs_lradc_dt_ids,
251ead25133SKsenija Stanojevic },
252ead25133SKsenija Stanojevic .probe = mxs_lradc_probe,
253ead25133SKsenija Stanojevic .remove = mxs_lradc_remove,
254ead25133SKsenija Stanojevic };
255ead25133SKsenija Stanojevic module_platform_driver(mxs_lradc_driver);
256ead25133SKsenija Stanojevic
257ead25133SKsenija Stanojevic MODULE_AUTHOR("Ksenija Stanojevic <ksenija.stanojevic@gmail.com>");
258ead25133SKsenija Stanojevic MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver");
259ead25133SKsenija Stanojevic MODULE_LICENSE("GPL");
260ead25133SKsenija Stanojevic MODULE_ALIAS("platform:mxs-lradc");
261