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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> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
93ee0a75 LF |
28 | #include <linux/init.h> |
29 | #include <linux/err.h> | |
30 | ||
31 | #define MC13783_ADC_NAME "mc13783-adc" | |
32 | ||
33 | struct mc13783_adc_priv { | |
34 | struct mc13783 *mc13783; | |
35 | struct device *hwmon_dev; | |
36 | }; | |
37 | ||
38 | static ssize_t mc13783_adc_show_name(struct device *dev, struct device_attribute | |
39 | *devattr, char *buf) | |
40 | { | |
41 | return sprintf(buf, "mc13783_adc\n"); | |
42 | } | |
43 | ||
44 | static int mc13783_adc_read(struct device *dev, | |
45 | struct device_attribute *devattr, unsigned int *val) | |
46 | { | |
47 | struct platform_device *pdev = to_platform_device(dev); | |
48 | struct mc13783_adc_priv *priv = platform_get_drvdata(pdev); | |
49 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
50 | unsigned int channel = attr->index; | |
51 | unsigned int sample[4]; | |
52 | int ret; | |
53 | ||
54 | ret = mc13783_adc_do_conversion(priv->mc13783, | |
55 | MC13783_ADC_MODE_MULT_CHAN, | |
56 | channel, sample); | |
57 | if (ret) | |
58 | return ret; | |
59 | ||
60 | channel &= 0x7; | |
61 | ||
62 | *val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff; | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | static ssize_t mc13783_adc_read_bp(struct device *dev, | |
68 | struct device_attribute *devattr, char *buf) | |
69 | { | |
70 | unsigned val; | |
71 | int ret = mc13783_adc_read(dev, devattr, &val); | |
72 | ||
73 | if (ret) | |
74 | return ret; | |
75 | ||
76 | /* | |
77 | * BP (channel 2) reports with offset 2.4V to the actual value to fit | |
78 | * the input range of the ADC. unit = 2.25mV = 9/4 mV. | |
79 | */ | |
80 | val = DIV_ROUND_CLOSEST(val * 9, 4) + 2400; | |
81 | ||
82 | return sprintf(buf, "%u\n", val); | |
83 | } | |
84 | ||
85 | static ssize_t mc13783_adc_read_gp(struct device *dev, | |
86 | struct device_attribute *devattr, char *buf) | |
87 | { | |
88 | unsigned val; | |
89 | int ret = mc13783_adc_read(dev, devattr, &val); | |
90 | ||
91 | if (ret) | |
92 | return ret; | |
93 | ||
94 | /* | |
95 | * input range is [0, 2.3V], val has 10 bits, so each bit | |
96 | * is worth 9/4 mV. | |
97 | */ | |
98 | val = DIV_ROUND_CLOSEST(val * 9, 4); | |
99 | ||
100 | return sprintf(buf, "%u\n", val); | |
101 | } | |
102 | ||
103 | static DEVICE_ATTR(name, S_IRUGO, mc13783_adc_show_name, NULL); | |
104 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, mc13783_adc_read_bp, NULL, 2); | |
105 | static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, mc13783_adc_read_gp, NULL, 5); | |
106 | static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, mc13783_adc_read_gp, NULL, 6); | |
107 | static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, mc13783_adc_read_gp, NULL, 7); | |
108 | static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, mc13783_adc_read_gp, NULL, 8); | |
109 | static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, mc13783_adc_read_gp, NULL, 9); | |
110 | static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, mc13783_adc_read_gp, NULL, 10); | |
111 | static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, mc13783_adc_read_gp, NULL, 11); | |
112 | static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, mc13783_adc_read_gp, NULL, 12); | |
113 | static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, mc13783_adc_read_gp, NULL, 13); | |
114 | static SENSOR_DEVICE_ATTR(in14_input, S_IRUGO, mc13783_adc_read_gp, NULL, 14); | |
115 | static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, mc13783_adc_read_gp, NULL, 15); | |
116 | ||
117 | static struct attribute *mc13783_attr[] = { | |
118 | &dev_attr_name.attr, | |
119 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
120 | &sensor_dev_attr_in5_input.dev_attr.attr, | |
121 | &sensor_dev_attr_in6_input.dev_attr.attr, | |
122 | &sensor_dev_attr_in7_input.dev_attr.attr, | |
123 | &sensor_dev_attr_in8_input.dev_attr.attr, | |
124 | &sensor_dev_attr_in9_input.dev_attr.attr, | |
125 | &sensor_dev_attr_in10_input.dev_attr.attr, | |
126 | &sensor_dev_attr_in11_input.dev_attr.attr, | |
127 | NULL | |
128 | }; | |
129 | ||
130 | static const struct attribute_group mc13783_group = { | |
131 | .attrs = mc13783_attr, | |
132 | }; | |
133 | ||
134 | /* last four channels may be occupied by the touchscreen */ | |
135 | static struct attribute *mc13783_attr_ts[] = { | |
136 | &sensor_dev_attr_in12_input.dev_attr.attr, | |
137 | &sensor_dev_attr_in13_input.dev_attr.attr, | |
138 | &sensor_dev_attr_in14_input.dev_attr.attr, | |
139 | &sensor_dev_attr_in15_input.dev_attr.attr, | |
140 | NULL | |
141 | }; | |
142 | ||
143 | static const struct attribute_group mc13783_group_ts = { | |
144 | .attrs = mc13783_attr_ts, | |
145 | }; | |
146 | ||
147 | static int __init mc13783_adc_probe(struct platform_device *pdev) | |
148 | { | |
149 | struct mc13783_adc_priv *priv; | |
150 | int ret; | |
151 | ||
152 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
153 | if (!priv) | |
154 | return -ENOMEM; | |
155 | ||
156 | priv->mc13783 = dev_get_drvdata(pdev->dev.parent); | |
157 | ||
158 | platform_set_drvdata(pdev, priv); | |
159 | ||
160 | /* Register sysfs hooks */ | |
161 | ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group); | |
162 | if (ret) | |
163 | goto out_err_create1; | |
164 | ||
165 | if (!(priv->mc13783->flags & MC13783_USE_TOUCHSCREEN)) | |
166 | ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts); | |
167 | if (ret) | |
168 | goto out_err_create2; | |
169 | ||
170 | priv->hwmon_dev = hwmon_device_register(&pdev->dev); | |
171 | if (IS_ERR(priv->hwmon_dev)) { | |
172 | ret = PTR_ERR(priv->hwmon_dev); | |
173 | dev_err(&pdev->dev, | |
174 | "hwmon_device_register failed with %d.\n", ret); | |
175 | goto out_err_register; | |
176 | } | |
177 | ||
178 | ||
179 | return 0; | |
180 | ||
181 | out_err_register: | |
182 | ||
183 | if (!(priv->mc13783->flags & MC13783_USE_TOUCHSCREEN)) | |
184 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts); | |
185 | out_err_create2: | |
186 | ||
187 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group); | |
188 | out_err_create1: | |
189 | ||
190 | platform_set_drvdata(pdev, NULL); | |
191 | kfree(priv); | |
192 | ||
193 | return ret; | |
194 | } | |
195 | ||
196 | static int __devexit mc13783_adc_remove(struct platform_device *pdev) | |
197 | { | |
198 | struct mc13783_adc_priv *priv = platform_get_drvdata(pdev); | |
199 | ||
200 | hwmon_device_unregister(priv->hwmon_dev); | |
201 | ||
202 | if (!(priv->mc13783->flags & MC13783_USE_TOUCHSCREEN)) | |
203 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts); | |
204 | ||
205 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group); | |
206 | ||
207 | platform_set_drvdata(pdev, NULL); | |
208 | kfree(priv); | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | static struct platform_driver mc13783_adc_driver = { | |
214 | .remove = __devexit_p(mc13783_adc_remove), | |
215 | .driver = { | |
216 | .owner = THIS_MODULE, | |
217 | .name = MC13783_ADC_NAME, | |
218 | }, | |
219 | }; | |
220 | ||
221 | static int __init mc13783_adc_init(void) | |
222 | { | |
223 | return platform_driver_probe(&mc13783_adc_driver, mc13783_adc_probe); | |
224 | } | |
225 | ||
226 | static void __exit mc13783_adc_exit(void) | |
227 | { | |
228 | platform_driver_unregister(&mc13783_adc_driver); | |
229 | } | |
230 | ||
231 | module_init(mc13783_adc_init); | |
232 | module_exit(mc13783_adc_exit); | |
233 | ||
234 | MODULE_DESCRIPTION("MC13783 ADC driver"); | |
235 | MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>"); | |
236 | MODULE_LICENSE("GPL"); | |
237 | MODULE_ALIAS("platform:" MC13783_ADC_NAME); |