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 <ksenija.stanojevic@gmail.com>
6 *
7 * Authors:
8 * Marek Vasut <marex@denx.de>
9 * Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
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
36enum 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
48enum 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
64static 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
74static 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
81static 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
95static 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
102static 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
115static 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
128static 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};
133MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
134
135static 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);
199 if (!res) {
200 ret = -ENOMEM;
201 goto err_clk;
202 }
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
241err_clk:
242 clk_disable_unprepare(lradc->clk);
243
244 return ret;
245}
246
247static 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
256static 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};
264module_platform_driver(mxs_lradc_driver);
265
266MODULE_AUTHOR("Ksenija Stanojevic <ksenija.stanojevic@gmail.com>");
267MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver");
268MODULE_LICENSE("GPL");
269MODULE_ALIAS("platform:mxs-lradc");
270