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93ee0a75 LF |
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 | ||
eaf06ee2 | 21 | #include <linux/mfd/mc13783.h> |
93ee0a75 LF |
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 | ||
eaf06ee2 UKK |
147 | static int mc13783_adc_use_touchscreen(struct platform_device *pdev) |
148 | { | |
149 | struct mc13783_adc_priv *priv = platform_get_drvdata(pdev); | |
150 | unsigned flags = mc13783_get_flags(priv->mc13783); | |
151 | ||
152 | return flags & MC13783_USE_TOUCHSCREEN; | |
153 | } | |
154 | ||
93ee0a75 LF |
155 | static int __init mc13783_adc_probe(struct platform_device *pdev) |
156 | { | |
157 | struct mc13783_adc_priv *priv; | |
158 | int ret; | |
159 | ||
160 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
161 | if (!priv) | |
162 | return -ENOMEM; | |
163 | ||
164 | priv->mc13783 = dev_get_drvdata(pdev->dev.parent); | |
165 | ||
166 | platform_set_drvdata(pdev, priv); | |
167 | ||
168 | /* Register sysfs hooks */ | |
169 | ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group); | |
170 | if (ret) | |
171 | goto out_err_create1; | |
172 | ||
eaf06ee2 | 173 | if (!mc13783_adc_use_touchscreen(pdev)) { |
93ee0a75 LF |
174 | ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts); |
175 | if (ret) | |
176 | goto out_err_create2; | |
eaf06ee2 | 177 | } |
93ee0a75 LF |
178 | |
179 | priv->hwmon_dev = hwmon_device_register(&pdev->dev); | |
180 | if (IS_ERR(priv->hwmon_dev)) { | |
181 | ret = PTR_ERR(priv->hwmon_dev); | |
182 | dev_err(&pdev->dev, | |
183 | "hwmon_device_register failed with %d.\n", ret); | |
184 | goto out_err_register; | |
185 | } | |
186 | ||
187 | ||
188 | return 0; | |
189 | ||
190 | out_err_register: | |
191 | ||
eaf06ee2 | 192 | if (!mc13783_adc_use_touchscreen(pdev)) |
93ee0a75 LF |
193 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts); |
194 | out_err_create2: | |
195 | ||
196 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group); | |
197 | out_err_create1: | |
198 | ||
199 | platform_set_drvdata(pdev, NULL); | |
200 | kfree(priv); | |
201 | ||
202 | return ret; | |
203 | } | |
204 | ||
205 | static int __devexit mc13783_adc_remove(struct platform_device *pdev) | |
206 | { | |
207 | struct mc13783_adc_priv *priv = platform_get_drvdata(pdev); | |
208 | ||
209 | hwmon_device_unregister(priv->hwmon_dev); | |
210 | ||
eaf06ee2 | 211 | if (!mc13783_adc_use_touchscreen(pdev)) |
93ee0a75 LF |
212 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts); |
213 | ||
214 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group); | |
215 | ||
216 | platform_set_drvdata(pdev, NULL); | |
217 | kfree(priv); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | static struct platform_driver mc13783_adc_driver = { | |
223 | .remove = __devexit_p(mc13783_adc_remove), | |
224 | .driver = { | |
225 | .owner = THIS_MODULE, | |
226 | .name = MC13783_ADC_NAME, | |
227 | }, | |
228 | }; | |
229 | ||
230 | static int __init mc13783_adc_init(void) | |
231 | { | |
232 | return platform_driver_probe(&mc13783_adc_driver, mc13783_adc_probe); | |
233 | } | |
234 | ||
235 | static void __exit mc13783_adc_exit(void) | |
236 | { | |
237 | platform_driver_unregister(&mc13783_adc_driver); | |
238 | } | |
239 | ||
240 | module_init(mc13783_adc_init); | |
241 | module_exit(mc13783_adc_exit); | |
242 | ||
243 | MODULE_DESCRIPTION("MC13783 ADC driver"); | |
244 | MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>"); | |
245 | MODULE_LICENSE("GPL"); | |
246 | MODULE_ALIAS("platform:" MC13783_ADC_NAME); |