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1 | /* |
2 | * axp288_adc.c - X-Powers AXP288 PMIC ADC Driver | |
3 | * | |
4 | * Copyright (C) 2014 Intel Corporation | |
5 | * | |
6 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; version 2 of the License. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | */ | |
18 | ||
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 | ||
34 | enum 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 | ||
44 | struct axp288_adc_info { | |
45 | int irq; | |
46 | struct regmap *regmap; | |
47 | }; | |
48 | ||
7ca6574a | 49 | static const struct iio_chan_spec axp288_adc_channels[] = { |
de89bd7f JP |
50 | { |
51 | .indexed = 1, | |
52 | .type = IIO_TEMP, | |
53 | .channel = 0, | |
54 | .address = AXP288_TS_ADC_H, | |
55 | .datasheet_name = "TS_PIN", | |
d0716b0e | 56 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
de89bd7f JP |
57 | }, { |
58 | .indexed = 1, | |
59 | .type = IIO_TEMP, | |
60 | .channel = 1, | |
61 | .address = AXP288_PMIC_ADC_H, | |
62 | .datasheet_name = "PMIC_TEMP", | |
d0716b0e | 63 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
de89bd7f JP |
64 | }, { |
65 | .indexed = 1, | |
66 | .type = IIO_TEMP, | |
67 | .channel = 2, | |
68 | .address = AXP288_GP_ADC_H, | |
69 | .datasheet_name = "GPADC", | |
d0716b0e | 70 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
de89bd7f JP |
71 | }, { |
72 | .indexed = 1, | |
73 | .type = IIO_CURRENT, | |
74 | .channel = 3, | |
75 | .address = AXP20X_BATT_CHRG_I_H, | |
76 | .datasheet_name = "BATT_CHG_I", | |
d0716b0e | 77 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
de89bd7f JP |
78 | }, { |
79 | .indexed = 1, | |
80 | .type = IIO_CURRENT, | |
81 | .channel = 4, | |
82 | .address = AXP20X_BATT_DISCHRG_I_H, | |
83 | .datasheet_name = "BATT_DISCHRG_I", | |
d0716b0e | 84 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
de89bd7f JP |
85 | }, { |
86 | .indexed = 1, | |
87 | .type = IIO_VOLTAGE, | |
88 | .channel = 5, | |
89 | .address = AXP20X_BATT_V_H, | |
90 | .datasheet_name = "BATT_V", | |
d0716b0e | 91 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
de89bd7f JP |
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 | /* for consumer drivers */ | |
104 | static 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 | ||
114 | static 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 | ||
126 | static int axp288_adc_set_ts(struct regmap *regmap, unsigned int mode, | |
127 | unsigned long address) | |
128 | { | |
129 | /* channels other than GPADC do not need to switch TS pin */ | |
130 | if (address != AXP288_GP_ADC_H) | |
131 | return 0; | |
132 | ||
133 | return regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, mode); | |
134 | } | |
135 | ||
136 | static 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; | |
de89bd7f JP |
157 | default: |
158 | ret = -EINVAL; | |
159 | } | |
160 | mutex_unlock(&indio_dev->mlock); | |
161 | ||
162 | return ret; | |
163 | } | |
164 | ||
165 | static int axp288_adc_set_state(struct regmap *regmap) | |
166 | { | |
167 | /* ADC should be always enabled for internal FG to function */ | |
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 | ||
174 | static const struct iio_info axp288_adc_iio_info = { | |
175 | .read_raw = &axp288_adc_read_raw, | |
176 | .driver_module = THIS_MODULE, | |
177 | }; | |
178 | ||
179 | static 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 | * Set ADC to enabled state at all time, including system suspend. | |
200 | * otherwise internal fuel gauge functionality may be affected. | |
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 | ||
225 | err_array_unregister: | |
226 | iio_map_array_unregister(indio_dev); | |
227 | ||
228 | return ret; | |
229 | } | |
230 | ||
231 | static 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 | ||
e682173f | 241 | static const struct platform_device_id axp288_adc_id_table[] = { |
29ec0a25 AL |
242 | { .name = "axp288_adc" }, |
243 | {}, | |
244 | }; | |
245 | ||
de89bd7f JP |
246 | static struct platform_driver axp288_adc_driver = { |
247 | .probe = axp288_adc_probe, | |
248 | .remove = axp288_adc_remove, | |
29ec0a25 | 249 | .id_table = axp288_adc_id_table, |
de89bd7f JP |
250 | .driver = { |
251 | .name = "axp288_adc", | |
de89bd7f JP |
252 | }, |
253 | }; | |
254 | ||
29ec0a25 AL |
255 | MODULE_DEVICE_TABLE(platform, axp288_adc_id_table); |
256 | ||
de89bd7f JP |
257 | module_platform_driver(axp288_adc_driver); |
258 | ||
259 | MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@linux.intel.com>"); | |
260 | MODULE_DESCRIPTION("X-Powers AXP288 ADC Driver"); | |
261 | MODULE_LICENSE("GPL"); |