1// SPDX-License-Identifier: GPL-2.0-or-later
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>
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/platform_device.h>
20#include <linux/property.h>
21#include <linux/slab.h>
22
23#define ADC_CELL 0
24#define TSC_CELL 1
25#define RES_MEM 0
26
27enum 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
39enum 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
55static 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
65static 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
72static 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
86static 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
93static 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
106static 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
119static 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};
124MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
125
126static int mxs_lradc_probe(struct platform_device *pdev)
127{
128 struct device *dev = &pdev->dev;
129 struct device_node *node = dev->of_node;
130 struct mxs_lradc *lradc;
131 struct mfd_cell *cells = NULL;
132 struct resource *res;
133 int ret = 0;
134 u32 ts_wires = 0;
135
136 lradc = devm_kzalloc(dev: &pdev->dev, size: sizeof(*lradc), GFP_KERNEL);
137 if (!lradc)
138 return -ENOMEM;
139
140 lradc->soc = (kernel_ulong_t)device_get_match_data(dev: &pdev->dev);
141
142 lradc->clk = devm_clk_get(dev: &pdev->dev, NULL);
143 if (IS_ERR(ptr: lradc->clk)) {
144 dev_err(dev, "Failed to get the delay unit clock\n");
145 return PTR_ERR(ptr: lradc->clk);
146 }
147
148 ret = clk_prepare_enable(clk: lradc->clk);
149 if (ret) {
150 dev_err(dev, "Failed to enable the delay unit clock\n");
151 return ret;
152 }
153
154 ret = of_property_read_u32(np: node, propname: "fsl,lradc-touchscreen-wires",
155 out_value: &ts_wires);
156
157 if (!ret) {
158 lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
159
160 switch (ts_wires) {
161 case 4:
162 lradc->touchscreen_wire = MXS_LRADC_TOUCHSCREEN_4WIRE;
163 break;
164 case 5:
165 if (lradc->soc == IMX28_LRADC) {
166 lradc->touchscreen_wire =
167 MXS_LRADC_TOUCHSCREEN_5WIRE;
168 break;
169 }
170 fallthrough; /* to an error message for i.MX23 */
171 default:
172 dev_err(&pdev->dev,
173 "Unsupported number of touchscreen wires (%d)\n"
174 , ts_wires);
175 ret = -EINVAL;
176 goto err_clk;
177 }
178 } else {
179 lradc->buffer_vchans = BUFFER_VCHANS_ALL;
180 }
181
182 platform_set_drvdata(pdev, data: lradc);
183
184 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
185 if (!res) {
186 ret = -ENOMEM;
187 goto err_clk;
188 }
189
190 switch (lradc->soc) {
191 case IMX23_LRADC:
192 mx23_adc_resources[RES_MEM] = *res;
193 mx23_touchscreen_resources[RES_MEM] = *res;
194 cells = mx23_cells;
195 break;
196 case IMX28_LRADC:
197 mx28_adc_resources[RES_MEM] = *res;
198 mx28_touchscreen_resources[RES_MEM] = *res;
199 cells = mx28_cells;
200 break;
201 default:
202 dev_err(dev, "Unsupported SoC\n");
203 ret = -ENODEV;
204 goto err_clk;
205 }
206
207 ret = devm_mfd_add_devices(dev: &pdev->dev, PLATFORM_DEVID_NONE,
208 cells: &cells[ADC_CELL], n_devs: 1, NULL, irq_base: 0, NULL);
209 if (ret) {
210 dev_err(&pdev->dev, "Failed to add the ADC subdevice\n");
211 goto err_clk;
212 }
213
214 if (!lradc->touchscreen_wire)
215 return 0;
216
217 ret = devm_mfd_add_devices(dev: &pdev->dev, PLATFORM_DEVID_NONE,
218 cells: &cells[TSC_CELL], n_devs: 1, NULL, irq_base: 0, NULL);
219 if (ret) {
220 dev_err(&pdev->dev,
221 "Failed to add the touchscreen subdevice\n");
222 goto err_clk;
223 }
224
225 return 0;
226
227err_clk:
228 clk_disable_unprepare(clk: lradc->clk);
229
230 return ret;
231}
232
233static void mxs_lradc_remove(struct platform_device *pdev)
234{
235 struct mxs_lradc *lradc = platform_get_drvdata(pdev);
236
237 clk_disable_unprepare(clk: lradc->clk);
238}
239
240static struct platform_driver mxs_lradc_driver = {
241 .driver = {
242 .name = "mxs-lradc",
243 .of_match_table = mxs_lradc_dt_ids,
244 },
245 .probe = mxs_lradc_probe,
246 .remove = mxs_lradc_remove,
247};
248module_platform_driver(mxs_lradc_driver);
249
250MODULE_AUTHOR("Ksenija Stanojevic <ksenija.stanojevic@gmail.com>");
251MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver");
252MODULE_LICENSE("GPL");
253MODULE_ALIAS("platform:mxs-lradc");
254

source code of linux/drivers/mfd/mxs-lradc.c