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1 | /* |
2 | * Driver for the Freescale Semiconductor MC13783 adc. | |
3 | * | |
4 | * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. | |
5 | * Copyright (C) 2009 Sascha Hauer, Pengutronix | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version 2 | |
10 | * of the License, or (at your option) any later version. | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along with | |
17 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
18 | * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include <linux/mfd/mc13783-private.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/hwmon-sysfs.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/hwmon.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/err.h> | |
29 | ||
30 | #define MC13783_ADC_NAME "mc13783-adc" | |
31 | ||
32 | struct mc13783_adc_priv { | |
33 | struct mc13783 *mc13783; | |
34 | struct device *hwmon_dev; | |
35 | }; | |
36 | ||
37 | static ssize_t mc13783_adc_show_name(struct device *dev, struct device_attribute | |
38 | *devattr, char *buf) | |
39 | { | |
40 | return sprintf(buf, "mc13783_adc\n"); | |
41 | } | |
42 | ||
43 | static int mc13783_adc_read(struct device *dev, | |
44 | struct device_attribute *devattr, unsigned int *val) | |
45 | { | |
46 | struct platform_device *pdev = to_platform_device(dev); | |
47 | struct mc13783_adc_priv *priv = platform_get_drvdata(pdev); | |
48 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
49 | unsigned int channel = attr->index; | |
50 | unsigned int sample[4]; | |
51 | int ret; | |
52 | ||
53 | ret = mc13783_adc_do_conversion(priv->mc13783, | |
54 | MC13783_ADC_MODE_MULT_CHAN, | |
55 | channel, sample); | |
56 | if (ret) | |
57 | return ret; | |
58 | ||
59 | channel &= 0x7; | |
60 | ||
61 | *val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff; | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
66 | static ssize_t mc13783_adc_read_bp(struct device *dev, | |
67 | struct device_attribute *devattr, char *buf) | |
68 | { | |
69 | unsigned val; | |
70 | int ret = mc13783_adc_read(dev, devattr, &val); | |
71 | ||
72 | if (ret) | |
73 | return ret; | |
74 | ||
75 | /* | |
76 | * BP (channel 2) reports with offset 2.4V to the actual value to fit | |
77 | * the input range of the ADC. unit = 2.25mV = 9/4 mV. | |
78 | */ | |
79 | val = DIV_ROUND_CLOSEST(val * 9, 4) + 2400; | |
80 | ||
81 | return sprintf(buf, "%u\n", val); | |
82 | } | |
83 | ||
84 | static ssize_t mc13783_adc_read_gp(struct device *dev, | |
85 | struct device_attribute *devattr, char *buf) | |
86 | { | |
87 | unsigned val; | |
88 | int ret = mc13783_adc_read(dev, devattr, &val); | |
89 | ||
90 | if (ret) | |
91 | return ret; | |
92 | ||
93 | /* | |
94 | * input range is [0, 2.3V], val has 10 bits, so each bit | |
95 | * is worth 9/4 mV. | |
96 | */ | |
97 | val = DIV_ROUND_CLOSEST(val * 9, 4); | |
98 | ||
99 | return sprintf(buf, "%u\n", val); | |
100 | } | |
101 | ||
102 | static DEVICE_ATTR(name, S_IRUGO, mc13783_adc_show_name, NULL); | |
103 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, mc13783_adc_read_bp, NULL, 2); | |
104 | static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, mc13783_adc_read_gp, NULL, 5); | |
105 | static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, mc13783_adc_read_gp, NULL, 6); | |
106 | static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, mc13783_adc_read_gp, NULL, 7); | |
107 | static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, mc13783_adc_read_gp, NULL, 8); | |
108 | static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, mc13783_adc_read_gp, NULL, 9); | |
109 | static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, mc13783_adc_read_gp, NULL, 10); | |
110 | static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, mc13783_adc_read_gp, NULL, 11); | |
111 | static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, mc13783_adc_read_gp, NULL, 12); | |
112 | static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, mc13783_adc_read_gp, NULL, 13); | |
113 | static SENSOR_DEVICE_ATTR(in14_input, S_IRUGO, mc13783_adc_read_gp, NULL, 14); | |
114 | static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, mc13783_adc_read_gp, NULL, 15); | |
115 | ||
116 | static struct attribute *mc13783_attr[] = { | |
117 | &dev_attr_name.attr, | |
118 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
119 | &sensor_dev_attr_in5_input.dev_attr.attr, | |
120 | &sensor_dev_attr_in6_input.dev_attr.attr, | |
121 | &sensor_dev_attr_in7_input.dev_attr.attr, | |
122 | &sensor_dev_attr_in8_input.dev_attr.attr, | |
123 | &sensor_dev_attr_in9_input.dev_attr.attr, | |
124 | &sensor_dev_attr_in10_input.dev_attr.attr, | |
125 | &sensor_dev_attr_in11_input.dev_attr.attr, | |
126 | NULL | |
127 | }; | |
128 | ||
129 | static const struct attribute_group mc13783_group = { | |
130 | .attrs = mc13783_attr, | |
131 | }; | |
132 | ||
133 | /* last four channels may be occupied by the touchscreen */ | |
134 | static struct attribute *mc13783_attr_ts[] = { | |
135 | &sensor_dev_attr_in12_input.dev_attr.attr, | |
136 | &sensor_dev_attr_in13_input.dev_attr.attr, | |
137 | &sensor_dev_attr_in14_input.dev_attr.attr, | |
138 | &sensor_dev_attr_in15_input.dev_attr.attr, | |
139 | NULL | |
140 | }; | |
141 | ||
142 | static const struct attribute_group mc13783_group_ts = { | |
143 | .attrs = mc13783_attr_ts, | |
144 | }; | |
145 | ||
146 | static int __init mc13783_adc_probe(struct platform_device *pdev) | |
147 | { | |
148 | struct mc13783_adc_priv *priv; | |
149 | int ret; | |
150 | ||
151 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
152 | if (!priv) | |
153 | return -ENOMEM; | |
154 | ||
155 | priv->mc13783 = dev_get_drvdata(pdev->dev.parent); | |
156 | ||
157 | platform_set_drvdata(pdev, priv); | |
158 | ||
159 | /* Register sysfs hooks */ | |
160 | ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group); | |
161 | if (ret) | |
162 | goto out_err_create1; | |
163 | ||
164 | if (!(priv->mc13783->flags & MC13783_USE_TOUCHSCREEN)) | |
165 | ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts); | |
166 | if (ret) | |
167 | goto out_err_create2; | |
168 | ||
169 | priv->hwmon_dev = hwmon_device_register(&pdev->dev); | |
170 | if (IS_ERR(priv->hwmon_dev)) { | |
171 | ret = PTR_ERR(priv->hwmon_dev); | |
172 | dev_err(&pdev->dev, | |
173 | "hwmon_device_register failed with %d.\n", ret); | |
174 | goto out_err_register; | |
175 | } | |
176 | ||
177 | ||
178 | return 0; | |
179 | ||
180 | out_err_register: | |
181 | ||
182 | if (!(priv->mc13783->flags & MC13783_USE_TOUCHSCREEN)) | |
183 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts); | |
184 | out_err_create2: | |
185 | ||
186 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group); | |
187 | out_err_create1: | |
188 | ||
189 | platform_set_drvdata(pdev, NULL); | |
190 | kfree(priv); | |
191 | ||
192 | return ret; | |
193 | } | |
194 | ||
195 | static int __devexit mc13783_adc_remove(struct platform_device *pdev) | |
196 | { | |
197 | struct mc13783_adc_priv *priv = platform_get_drvdata(pdev); | |
198 | ||
199 | hwmon_device_unregister(priv->hwmon_dev); | |
200 | ||
201 | if (!(priv->mc13783->flags & MC13783_USE_TOUCHSCREEN)) | |
202 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts); | |
203 | ||
204 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group); | |
205 | ||
206 | platform_set_drvdata(pdev, NULL); | |
207 | kfree(priv); | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static struct platform_driver mc13783_adc_driver = { | |
213 | .remove = __devexit_p(mc13783_adc_remove), | |
214 | .driver = { | |
215 | .owner = THIS_MODULE, | |
216 | .name = MC13783_ADC_NAME, | |
217 | }, | |
218 | }; | |
219 | ||
220 | static int __init mc13783_adc_init(void) | |
221 | { | |
222 | return platform_driver_probe(&mc13783_adc_driver, mc13783_adc_probe); | |
223 | } | |
224 | ||
225 | static void __exit mc13783_adc_exit(void) | |
226 | { | |
227 | platform_driver_unregister(&mc13783_adc_driver); | |
228 | } | |
229 | ||
230 | module_init(mc13783_adc_init); | |
231 | module_exit(mc13783_adc_exit); | |
232 | ||
233 | MODULE_DESCRIPTION("MC13783 ADC driver"); | |
234 | MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>"); | |
235 | MODULE_LICENSE("GPL"); | |
236 | MODULE_ALIAS("platform:" MC13783_ADC_NAME); |