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f0347c36 KM |
1 | /* |
2 | * TI LP8788 MFD - ADC driver | |
3 | * | |
4 | * Copyright 2012 Texas Instruments | |
5 | * | |
6 | * Author: Milo(Woogyom) Kim <milo.kim@ti.com> | |
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 version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/delay.h> | |
14 | #include <linux/iio/iio.h> | |
15 | #include <linux/iio/driver.h> | |
16 | #include <linux/iio/machine.h> | |
17 | #include <linux/mfd/lp8788.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/mutex.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/slab.h> | |
22 | ||
23 | /* register address */ | |
24 | #define LP8788_ADC_CONF 0x60 | |
25 | #define LP8788_ADC_RAW 0x61 | |
26 | #define LP8788_ADC_DONE 0x63 | |
27 | ||
28 | #define ADC_CONV_START 1 | |
29 | ||
30 | struct lp8788_adc { | |
31 | struct lp8788 *lp; | |
32 | struct iio_map *map; | |
33 | struct mutex lock; | |
34 | }; | |
35 | ||
36 | static const int lp8788_scale[LPADC_MAX] = { | |
37 | [LPADC_VBATT_5P5] = 1343101, | |
38 | [LPADC_VIN_CHG] = 3052503, | |
39 | [LPADC_IBATT] = 610500, | |
40 | [LPADC_IC_TEMP] = 61050, | |
41 | [LPADC_VBATT_6P0] = 1465201, | |
42 | [LPADC_VBATT_5P0] = 1221001, | |
43 | [LPADC_ADC1] = 610500, | |
44 | [LPADC_ADC2] = 610500, | |
45 | [LPADC_VDD] = 1025641, | |
46 | [LPADC_VCOIN] = 757020, | |
47 | [LPADC_ADC3] = 610500, | |
48 | [LPADC_ADC4] = 610500, | |
49 | }; | |
50 | ||
51 | static int lp8788_get_adc_result(struct lp8788_adc *adc, enum lp8788_adc_id id, | |
52 | int *val) | |
53 | { | |
54 | unsigned int msb; | |
55 | unsigned int lsb; | |
56 | unsigned int result; | |
57 | u8 data; | |
58 | u8 rawdata[2]; | |
59 | int size = ARRAY_SIZE(rawdata); | |
60 | int retry = 5; | |
61 | int ret; | |
62 | ||
63 | data = (id << 1) | ADC_CONV_START; | |
64 | ret = lp8788_write_byte(adc->lp, LP8788_ADC_CONF, data); | |
65 | if (ret) | |
66 | goto err_io; | |
67 | ||
68 | /* retry until adc conversion is done */ | |
69 | data = 0; | |
70 | while (retry--) { | |
71 | usleep_range(100, 200); | |
72 | ||
73 | ret = lp8788_read_byte(adc->lp, LP8788_ADC_DONE, &data); | |
74 | if (ret) | |
75 | goto err_io; | |
76 | ||
77 | /* conversion done */ | |
78 | if (data) | |
79 | break; | |
80 | } | |
81 | ||
82 | ret = lp8788_read_multi_bytes(adc->lp, LP8788_ADC_RAW, rawdata, size); | |
83 | if (ret) | |
84 | goto err_io; | |
85 | ||
86 | msb = (rawdata[0] << 4) & 0x00000ff0; | |
87 | lsb = (rawdata[1] >> 4) & 0x0000000f; | |
88 | result = msb | lsb; | |
89 | *val = result; | |
90 | ||
91 | return 0; | |
92 | ||
93 | err_io: | |
94 | return ret; | |
95 | } | |
96 | ||
97 | static int lp8788_adc_read_raw(struct iio_dev *indio_dev, | |
98 | struct iio_chan_spec const *chan, | |
99 | int *val, int *val2, long mask) | |
100 | { | |
101 | struct lp8788_adc *adc = iio_priv(indio_dev); | |
102 | enum lp8788_adc_id id = chan->channel; | |
103 | int ret; | |
104 | ||
105 | mutex_lock(&adc->lock); | |
106 | ||
107 | switch (mask) { | |
108 | case IIO_CHAN_INFO_RAW: | |
109 | ret = lp8788_get_adc_result(adc, id, val) ? -EIO : IIO_VAL_INT; | |
110 | break; | |
111 | case IIO_CHAN_INFO_SCALE: | |
112 | *val = lp8788_scale[id] / 1000000; | |
113 | *val2 = lp8788_scale[id] % 1000000; | |
114 | ret = IIO_VAL_INT_PLUS_MICRO; | |
115 | break; | |
116 | default: | |
117 | ret = -EINVAL; | |
118 | break; | |
119 | } | |
120 | ||
121 | mutex_unlock(&adc->lock); | |
122 | ||
123 | return ret; | |
124 | } | |
125 | ||
126 | static const struct iio_info lp8788_adc_info = { | |
127 | .read_raw = &lp8788_adc_read_raw, | |
128 | .driver_module = THIS_MODULE, | |
129 | }; | |
130 | ||
131 | #define LP8788_CHAN(_id, _type) { \ | |
132 | .type = _type, \ | |
133 | .indexed = 1, \ | |
134 | .channel = LPADC_##_id, \ | |
135 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \ | |
136 | IIO_CHAN_INFO_SCALE_SEPARATE_BIT, \ | |
137 | .datasheet_name = #_id, \ | |
138 | } | |
139 | ||
140 | static const struct iio_chan_spec lp8788_adc_channels[] = { | |
141 | [LPADC_VBATT_5P5] = LP8788_CHAN(VBATT_5P5, IIO_VOLTAGE), | |
142 | [LPADC_VIN_CHG] = LP8788_CHAN(VIN_CHG, IIO_VOLTAGE), | |
143 | [LPADC_IBATT] = LP8788_CHAN(IBATT, IIO_CURRENT), | |
144 | [LPADC_IC_TEMP] = LP8788_CHAN(IC_TEMP, IIO_TEMP), | |
145 | [LPADC_VBATT_6P0] = LP8788_CHAN(VBATT_6P0, IIO_VOLTAGE), | |
146 | [LPADC_VBATT_5P0] = LP8788_CHAN(VBATT_5P0, IIO_VOLTAGE), | |
147 | [LPADC_ADC1] = LP8788_CHAN(ADC1, IIO_VOLTAGE), | |
148 | [LPADC_ADC2] = LP8788_CHAN(ADC2, IIO_VOLTAGE), | |
149 | [LPADC_VDD] = LP8788_CHAN(VDD, IIO_VOLTAGE), | |
150 | [LPADC_VCOIN] = LP8788_CHAN(VCOIN, IIO_VOLTAGE), | |
151 | [LPADC_ADC3] = LP8788_CHAN(ADC3, IIO_VOLTAGE), | |
152 | [LPADC_ADC4] = LP8788_CHAN(ADC4, IIO_VOLTAGE), | |
153 | }; | |
154 | ||
155 | /* default maps used by iio consumer (lp8788-charger driver) */ | |
156 | static struct iio_map lp8788_default_iio_maps[] = { | |
157 | { | |
158 | .consumer_dev_name = "lp8788-charger", | |
159 | .consumer_channel = "lp8788_vbatt_5p0", | |
160 | .adc_channel_label = "VBATT_5P0", | |
161 | }, | |
162 | { | |
163 | .consumer_dev_name = "lp8788-charger", | |
164 | .consumer_channel = "lp8788_adc1", | |
165 | .adc_channel_label = "ADC1", | |
166 | }, | |
167 | { } | |
168 | }; | |
169 | ||
170 | static int lp8788_iio_map_register(struct iio_dev *indio_dev, | |
171 | struct lp8788_platform_data *pdata, | |
172 | struct lp8788_adc *adc) | |
173 | { | |
174 | struct iio_map *map; | |
175 | int ret; | |
176 | ||
177 | map = (!pdata || !pdata->adc_pdata) ? | |
178 | lp8788_default_iio_maps : pdata->adc_pdata; | |
179 | ||
180 | ret = iio_map_array_register(indio_dev, map); | |
181 | if (ret) { | |
5306f416 | 182 | dev_err(&indio_dev->dev, "iio map err: %d\n", ret); |
f0347c36 KM |
183 | return ret; |
184 | } | |
185 | ||
186 | adc->map = map; | |
187 | return 0; | |
188 | } | |
189 | ||
fc52692c | 190 | static int lp8788_adc_probe(struct platform_device *pdev) |
f0347c36 KM |
191 | { |
192 | struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent); | |
193 | struct iio_dev *indio_dev; | |
194 | struct lp8788_adc *adc; | |
195 | int ret; | |
196 | ||
197 | indio_dev = iio_device_alloc(sizeof(*adc)); | |
198 | if (!indio_dev) | |
199 | return -ENOMEM; | |
200 | ||
201 | adc = iio_priv(indio_dev); | |
202 | adc->lp = lp; | |
203 | platform_set_drvdata(pdev, indio_dev); | |
204 | ||
c3a69e6c | 205 | indio_dev->dev.of_node = pdev->dev.of_node; |
f0347c36 KM |
206 | ret = lp8788_iio_map_register(indio_dev, lp->pdata, adc); |
207 | if (ret) | |
208 | goto err_iio_map; | |
209 | ||
210 | mutex_init(&adc->lock); | |
211 | ||
dc116999 | 212 | indio_dev->dev.parent = &pdev->dev; |
f0347c36 KM |
213 | indio_dev->name = pdev->name; |
214 | indio_dev->modes = INDIO_DIRECT_MODE; | |
215 | indio_dev->info = &lp8788_adc_info; | |
216 | indio_dev->channels = lp8788_adc_channels; | |
217 | indio_dev->num_channels = ARRAY_SIZE(lp8788_adc_channels); | |
218 | ||
219 | ret = iio_device_register(indio_dev); | |
220 | if (ret) { | |
dc116999 | 221 | dev_err(&pdev->dev, "iio dev register err: %d\n", ret); |
f0347c36 KM |
222 | goto err_iio_device; |
223 | } | |
224 | ||
225 | return 0; | |
226 | ||
227 | err_iio_device: | |
6cb2afd7 | 228 | iio_map_array_unregister(indio_dev); |
f0347c36 KM |
229 | err_iio_map: |
230 | iio_device_free(indio_dev); | |
231 | return ret; | |
232 | } | |
233 | ||
fc52692c | 234 | static int lp8788_adc_remove(struct platform_device *pdev) |
f0347c36 KM |
235 | { |
236 | struct iio_dev *indio_dev = platform_get_drvdata(pdev); | |
f0347c36 KM |
237 | |
238 | iio_device_unregister(indio_dev); | |
6cb2afd7 | 239 | iio_map_array_unregister(indio_dev); |
f0347c36 KM |
240 | iio_device_free(indio_dev); |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | static struct platform_driver lp8788_adc_driver = { | |
246 | .probe = lp8788_adc_probe, | |
fc52692c | 247 | .remove = lp8788_adc_remove, |
f0347c36 KM |
248 | .driver = { |
249 | .name = LP8788_DEV_ADC, | |
250 | .owner = THIS_MODULE, | |
251 | }, | |
252 | }; | |
253 | module_platform_driver(lp8788_adc_driver); | |
254 | ||
255 | MODULE_DESCRIPTION("Texas Instruments LP8788 ADC Driver"); | |
256 | MODULE_AUTHOR("Milo Kim"); | |
257 | MODULE_LICENSE("GPL"); | |
258 | MODULE_ALIAS("platform:lp8788-adc"); |