1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17#include <linux/clk.h>
18#include <linux/err.h>
19#include <linux/interrupt.h>
20#include <linux/io.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/platform_device.h>
24#include <linux/regulator/consumer.h>
25#include <linux/slab.h>
26
27#include <linux/iio/iio.h>
28#include <linux/iio/sysfs.h>
29
30#define VF610_DACx_STATCTRL 0x20
31
32#define VF610_DAC_DACEN BIT(15)
33#define VF610_DAC_DACRFS BIT(14)
34#define VF610_DAC_LPEN BIT(11)
35
36#define VF610_DAC_DAT0(x) ((x) & 0xFFF)
37
38enum vf610_conversion_mode_sel {
39 VF610_DAC_CONV_HIGH_POWER,
40 VF610_DAC_CONV_LOW_POWER,
41};
42
43struct vf610_dac {
44 struct clk *clk;
45 struct device *dev;
46 enum vf610_conversion_mode_sel conv_mode;
47 void __iomem *regs;
48};
49
50static void vf610_dac_init(struct vf610_dac *info)
51{
52 int val;
53
54 info->conv_mode = VF610_DAC_CONV_LOW_POWER;
55 val = VF610_DAC_DACEN | VF610_DAC_DACRFS |
56 VF610_DAC_LPEN;
57 writel(val, info->regs + VF610_DACx_STATCTRL);
58}
59
60static void vf610_dac_exit(struct vf610_dac *info)
61{
62 int val;
63
64 val = readl(info->regs + VF610_DACx_STATCTRL);
65 val &= ~VF610_DAC_DACEN;
66 writel(val, info->regs + VF610_DACx_STATCTRL);
67}
68
69static int vf610_set_conversion_mode(struct iio_dev *indio_dev,
70 const struct iio_chan_spec *chan,
71 unsigned int mode)
72{
73 struct vf610_dac *info = iio_priv(indio_dev);
74 int val;
75
76 mutex_lock(&indio_dev->mlock);
77 info->conv_mode = mode;
78 val = readl(info->regs + VF610_DACx_STATCTRL);
79 if (mode)
80 val |= VF610_DAC_LPEN;
81 else
82 val &= ~VF610_DAC_LPEN;
83 writel(val, info->regs + VF610_DACx_STATCTRL);
84 mutex_unlock(&indio_dev->mlock);
85
86 return 0;
87}
88
89static int vf610_get_conversion_mode(struct iio_dev *indio_dev,
90 const struct iio_chan_spec *chan)
91{
92 struct vf610_dac *info = iio_priv(indio_dev);
93
94 return info->conv_mode;
95}
96
97static const char * const vf610_conv_modes[] = { "high-power", "low-power" };
98
99static const struct iio_enum vf610_conversion_mode = {
100 .items = vf610_conv_modes,
101 .num_items = ARRAY_SIZE(vf610_conv_modes),
102 .get = vf610_get_conversion_mode,
103 .set = vf610_set_conversion_mode,
104};
105
106static const struct iio_chan_spec_ext_info vf610_ext_info[] = {
107 IIO_ENUM("conversion_mode", IIO_SHARED_BY_DIR,
108 &vf610_conversion_mode),
109 {},
110};
111
112#define VF610_DAC_CHAN(_chan_type) { \
113 .type = (_chan_type), \
114 .output = 1, \
115 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
116 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
117 .ext_info = vf610_ext_info, \
118}
119
120static const struct iio_chan_spec vf610_dac_iio_channels[] = {
121 VF610_DAC_CHAN(IIO_VOLTAGE),
122};
123
124static int vf610_read_raw(struct iio_dev *indio_dev,
125 struct iio_chan_spec const *chan,
126 int *val, int *val2,
127 long mask)
128{
129 struct vf610_dac *info = iio_priv(indio_dev);
130
131 switch (mask) {
132 case IIO_CHAN_INFO_RAW:
133 *val = VF610_DAC_DAT0(readl(info->regs));
134 return IIO_VAL_INT;
135 case IIO_CHAN_INFO_SCALE:
136
137
138
139
140
141 *val = 3300 ;
142 *val2 = 12;
143 return IIO_VAL_FRACTIONAL_LOG2;
144
145 default:
146 return -EINVAL;
147 }
148}
149
150static int vf610_write_raw(struct iio_dev *indio_dev,
151 struct iio_chan_spec const *chan,
152 int val, int val2,
153 long mask)
154{
155 struct vf610_dac *info = iio_priv(indio_dev);
156
157 switch (mask) {
158 case IIO_CHAN_INFO_RAW:
159 mutex_lock(&indio_dev->mlock);
160 writel(VF610_DAC_DAT0(val), info->regs);
161 mutex_unlock(&indio_dev->mlock);
162 return 0;
163
164 default:
165 return -EINVAL;
166 }
167}
168
169static const struct iio_info vf610_dac_iio_info = {
170 .read_raw = &vf610_read_raw,
171 .write_raw = &vf610_write_raw,
172};
173
174static const struct of_device_id vf610_dac_match[] = {
175 { .compatible = "fsl,vf610-dac", },
176 { }
177};
178MODULE_DEVICE_TABLE(of, vf610_dac_match);
179
180static int vf610_dac_probe(struct platform_device *pdev)
181{
182 struct iio_dev *indio_dev;
183 struct vf610_dac *info;
184 struct resource *mem;
185 int ret;
186
187 indio_dev = devm_iio_device_alloc(&pdev->dev,
188 sizeof(struct vf610_dac));
189 if (!indio_dev) {
190 dev_err(&pdev->dev, "Failed allocating iio device\n");
191 return -ENOMEM;
192 }
193
194 info = iio_priv(indio_dev);
195 info->dev = &pdev->dev;
196
197 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
198 info->regs = devm_ioremap_resource(&pdev->dev, mem);
199 if (IS_ERR(info->regs))
200 return PTR_ERR(info->regs);
201
202 info->clk = devm_clk_get(&pdev->dev, "dac");
203 if (IS_ERR(info->clk)) {
204 dev_err(&pdev->dev, "Failed getting clock, err = %ld\n",
205 PTR_ERR(info->clk));
206 return PTR_ERR(info->clk);
207 }
208
209 platform_set_drvdata(pdev, indio_dev);
210
211 indio_dev->name = dev_name(&pdev->dev);
212 indio_dev->dev.parent = &pdev->dev;
213 indio_dev->dev.of_node = pdev->dev.of_node;
214 indio_dev->info = &vf610_dac_iio_info;
215 indio_dev->modes = INDIO_DIRECT_MODE;
216 indio_dev->channels = vf610_dac_iio_channels;
217 indio_dev->num_channels = ARRAY_SIZE(vf610_dac_iio_channels);
218
219 ret = clk_prepare_enable(info->clk);
220 if (ret) {
221 dev_err(&pdev->dev,
222 "Could not prepare or enable the clock\n");
223 return ret;
224 }
225
226 vf610_dac_init(info);
227
228 ret = iio_device_register(indio_dev);
229 if (ret) {
230 dev_err(&pdev->dev, "Couldn't register the device\n");
231 goto error_iio_device_register;
232 }
233
234 return 0;
235
236error_iio_device_register:
237 clk_disable_unprepare(info->clk);
238
239 return ret;
240}
241
242static int vf610_dac_remove(struct platform_device *pdev)
243{
244 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
245 struct vf610_dac *info = iio_priv(indio_dev);
246
247 iio_device_unregister(indio_dev);
248 vf610_dac_exit(info);
249 clk_disable_unprepare(info->clk);
250
251 return 0;
252}
253
254#ifdef CONFIG_PM_SLEEP
255static int vf610_dac_suspend(struct device *dev)
256{
257 struct iio_dev *indio_dev = dev_get_drvdata(dev);
258 struct vf610_dac *info = iio_priv(indio_dev);
259
260 vf610_dac_exit(info);
261 clk_disable_unprepare(info->clk);
262
263 return 0;
264}
265
266static int vf610_dac_resume(struct device *dev)
267{
268 struct iio_dev *indio_dev = dev_get_drvdata(dev);
269 struct vf610_dac *info = iio_priv(indio_dev);
270 int ret;
271
272 ret = clk_prepare_enable(info->clk);
273 if (ret)
274 return ret;
275
276 vf610_dac_init(info);
277
278 return 0;
279}
280#endif
281
282static SIMPLE_DEV_PM_OPS(vf610_dac_pm_ops, vf610_dac_suspend, vf610_dac_resume);
283
284static struct platform_driver vf610_dac_driver = {
285 .probe = vf610_dac_probe,
286 .remove = vf610_dac_remove,
287 .driver = {
288 .name = "vf610-dac",
289 .of_match_table = vf610_dac_match,
290 .pm = &vf610_dac_pm_ops,
291 },
292};
293module_platform_driver(vf610_dac_driver);
294
295MODULE_AUTHOR("Sanchayan Maity <sanchayan.maity@toradex.com>");
296MODULE_DESCRIPTION("Freescale VF610 DAC driver");
297MODULE_LICENSE("GPL v2");
298
