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19#include <linux/module.h>
20#include <linux/kernel.h>
21#include <linux/device.h>
22#include <linux/regmap.h>
23#include <linux/mfd/axp20x.h>
24#include <linux/platform_device.h>
25
26#include <linux/iio/iio.h>
27#include <linux/iio/machine.h>
28#include <linux/iio/driver.h>
29
30#define AXP288_ADC_EN_MASK 0xF1
31#define AXP288_ADC_TS_PIN_GPADC 0xF2
32#define AXP288_ADC_TS_PIN_ON 0xF3
33
34enum axp288_adc_id {
35 AXP288_ADC_TS,
36 AXP288_ADC_PMIC,
37 AXP288_ADC_GP,
38 AXP288_ADC_BATT_CHRG_I,
39 AXP288_ADC_BATT_DISCHRG_I,
40 AXP288_ADC_BATT_V,
41 AXP288_ADC_NR_CHAN,
42};
43
44struct axp288_adc_info {
45 int irq;
46 struct regmap *regmap;
47};
48
49static const struct iio_chan_spec axp288_adc_channels[] = {
50 {
51 .indexed = 1,
52 .type = IIO_TEMP,
53 .channel = 0,
54 .address = AXP288_TS_ADC_H,
55 .datasheet_name = "TS_PIN",
56 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
57 }, {
58 .indexed = 1,
59 .type = IIO_TEMP,
60 .channel = 1,
61 .address = AXP288_PMIC_ADC_H,
62 .datasheet_name = "PMIC_TEMP",
63 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
64 }, {
65 .indexed = 1,
66 .type = IIO_TEMP,
67 .channel = 2,
68 .address = AXP288_GP_ADC_H,
69 .datasheet_name = "GPADC",
70 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
71 }, {
72 .indexed = 1,
73 .type = IIO_CURRENT,
74 .channel = 3,
75 .address = AXP20X_BATT_CHRG_I_H,
76 .datasheet_name = "BATT_CHG_I",
77 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
78 }, {
79 .indexed = 1,
80 .type = IIO_CURRENT,
81 .channel = 4,
82 .address = AXP20X_BATT_DISCHRG_I_H,
83 .datasheet_name = "BATT_DISCHRG_I",
84 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
85 }, {
86 .indexed = 1,
87 .type = IIO_VOLTAGE,
88 .channel = 5,
89 .address = AXP20X_BATT_V_H,
90 .datasheet_name = "BATT_V",
91 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
92 },
93};
94
95#define AXP288_ADC_MAP(_adc_channel_label, _consumer_dev_name, \
96 _consumer_channel) \
97 { \
98 .adc_channel_label = _adc_channel_label, \
99 .consumer_dev_name = _consumer_dev_name, \
100 .consumer_channel = _consumer_channel, \
101 }
102
103
104static struct iio_map axp288_adc_default_maps[] = {
105 AXP288_ADC_MAP("TS_PIN", "axp288-batt", "axp288-batt-temp"),
106 AXP288_ADC_MAP("PMIC_TEMP", "axp288-pmic", "axp288-pmic-temp"),
107 AXP288_ADC_MAP("GPADC", "axp288-gpadc", "axp288-system-temp"),
108 AXP288_ADC_MAP("BATT_CHG_I", "axp288-chrg", "axp288-chrg-curr"),
109 AXP288_ADC_MAP("BATT_DISCHRG_I", "axp288-chrg", "axp288-chrg-d-curr"),
110 AXP288_ADC_MAP("BATT_V", "axp288-batt", "axp288-batt-volt"),
111 {},
112};
113
114static int axp288_adc_read_channel(int *val, unsigned long address,
115 struct regmap *regmap)
116{
117 u8 buf[2];
118
119 if (regmap_bulk_read(regmap, address, buf, 2))
120 return -EIO;
121 *val = (buf[0] << 4) + ((buf[1] >> 4) & 0x0F);
122
123 return IIO_VAL_INT;
124}
125
126static int axp288_adc_set_ts(struct regmap *regmap, unsigned int mode,
127 unsigned long address)
128{
129
130 if (address != AXP288_GP_ADC_H)
131 return 0;
132
133 return regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, mode);
134}
135
136static int axp288_adc_read_raw(struct iio_dev *indio_dev,
137 struct iio_chan_spec const *chan,
138 int *val, int *val2, long mask)
139{
140 int ret;
141 struct axp288_adc_info *info = iio_priv(indio_dev);
142
143 mutex_lock(&indio_dev->mlock);
144 switch (mask) {
145 case IIO_CHAN_INFO_RAW:
146 if (axp288_adc_set_ts(info->regmap, AXP288_ADC_TS_PIN_GPADC,
147 chan->address)) {
148 dev_err(&indio_dev->dev, "GPADC mode\n");
149 ret = -EINVAL;
150 break;
151 }
152 ret = axp288_adc_read_channel(val, chan->address, info->regmap);
153 if (axp288_adc_set_ts(info->regmap, AXP288_ADC_TS_PIN_ON,
154 chan->address))
155 dev_err(&indio_dev->dev, "TS pin restore\n");
156 break;
157 default:
158 ret = -EINVAL;
159 }
160 mutex_unlock(&indio_dev->mlock);
161
162 return ret;
163}
164
165static int axp288_adc_set_state(struct regmap *regmap)
166{
167
168 if (regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, AXP288_ADC_TS_PIN_ON))
169 return -EIO;
170
171 return regmap_write(regmap, AXP20X_ADC_EN1, AXP288_ADC_EN_MASK);
172}
173
174static const struct iio_info axp288_adc_iio_info = {
175 .read_raw = &axp288_adc_read_raw,
176 .driver_module = THIS_MODULE,
177};
178
179static int axp288_adc_probe(struct platform_device *pdev)
180{
181 int ret;
182 struct axp288_adc_info *info;
183 struct iio_dev *indio_dev;
184 struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
185
186 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));
187 if (!indio_dev)
188 return -ENOMEM;
189
190 info = iio_priv(indio_dev);
191 info->irq = platform_get_irq(pdev, 0);
192 if (info->irq < 0) {
193 dev_err(&pdev->dev, "no irq resource?\n");
194 return info->irq;
195 }
196 platform_set_drvdata(pdev, indio_dev);
197 info->regmap = axp20x->regmap;
198
199
200
201
202 ret = axp288_adc_set_state(axp20x->regmap);
203 if (ret) {
204 dev_err(&pdev->dev, "unable to enable ADC device\n");
205 return ret;
206 }
207
208 indio_dev->dev.parent = &pdev->dev;
209 indio_dev->name = pdev->name;
210 indio_dev->channels = axp288_adc_channels;
211 indio_dev->num_channels = ARRAY_SIZE(axp288_adc_channels);
212 indio_dev->info = &axp288_adc_iio_info;
213 indio_dev->modes = INDIO_DIRECT_MODE;
214 ret = iio_map_array_register(indio_dev, axp288_adc_default_maps);
215 if (ret < 0)
216 return ret;
217
218 ret = iio_device_register(indio_dev);
219 if (ret < 0) {
220 dev_err(&pdev->dev, "unable to register iio device\n");
221 goto err_array_unregister;
222 }
223 return 0;
224
225err_array_unregister:
226 iio_map_array_unregister(indio_dev);
227
228 return ret;
229}
230
231static int axp288_adc_remove(struct platform_device *pdev)
232{
233 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
234
235 iio_device_unregister(indio_dev);
236 iio_map_array_unregister(indio_dev);
237
238 return 0;
239}
240
241static const struct platform_device_id axp288_adc_id_table[] = {
242 { .name = "axp288_adc" },
243 {},
244};
245
246static struct platform_driver axp288_adc_driver = {
247 .probe = axp288_adc_probe,
248 .remove = axp288_adc_remove,
249 .id_table = axp288_adc_id_table,
250 .driver = {
251 .name = "axp288_adc",
252 },
253};
254
255MODULE_DEVICE_TABLE(platform, axp288_adc_id_table);
256
257module_platform_driver(axp288_adc_driver);
258
259MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@linux.intel.com>");
260MODULE_DESCRIPTION("X-Powers AXP288 ADC Driver");
261MODULE_LICENSE("GPL");
262
