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1 | /* |
2 | * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de> |
3 | * JZ4740 SoC HWMON driver |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the |
7 | * Free Software Foundation; either version 2 of the License, or (at your |
8 | * option) any later version. |
9 | * |
10 | * You should have received a copy of the GNU General Public License along |
11 | * with this program; if not, write to the Free Software Foundation, Inc., |
12 | * 675 Mass Ave, Cambridge, MA 02139, USA. |
13 | * |
14 | */ |
15 | |
16 | #include <linux/err.h> |
17 | #include <linux/interrupt.h> |
18 | #include <linux/kernel.h> |
19 | #include <linux/module.h> |
20 | #include <linux/mutex.h> |
21 | #include <linux/platform_device.h> |
22 | #include <linux/slab.h> |
23 | #include <linux/io.h> |
24 | |
25 | #include <linux/completion.h> |
26 | #include <linux/mfd/core.h> |
27 | |
28 | #include <linux/hwmon.h> |
29 | |
30 | struct jz4740_hwmon { |
31 | struct resource *mem; |
32 | void __iomem *base; |
33 | |
34 | int irq; |
35 | |
36 | const struct mfd_cell *cell; |
37 | struct device *hwmon; |
38 | |
39 | struct completion read_completion; |
40 | |
41 | struct mutex lock; |
42 | }; |
43 | |
44 | static ssize_t jz4740_hwmon_show_name(struct device *dev, |
45 | struct device_attribute *dev_attr, char *buf) |
46 | { |
47 | return sprintf(buf, "jz4740\n"); |
48 | } |
49 | |
50 | static irqreturn_t jz4740_hwmon_irq(int irq, void *data) |
51 | { |
52 | struct jz4740_hwmon *hwmon = data; |
53 | |
54 | complete(&hwmon->read_completion); |
55 | return IRQ_HANDLED; |
56 | } |
57 | |
58 | static ssize_t jz4740_hwmon_read_adcin(struct device *dev, |
59 | struct device_attribute *dev_attr, char *buf) |
60 | { |
61 | struct jz4740_hwmon *hwmon = dev_get_drvdata(dev); |
62 | struct completion *completion = &hwmon->read_completion; |
63 | long t; |
64 | unsigned long val; |
65 | int ret; |
66 | |
67 | mutex_lock(&hwmon->lock); |
68 | |
69 | INIT_COMPLETION(*completion); |
70 | |
71 | enable_irq(hwmon->irq); |
72 | hwmon->cell->enable(to_platform_device(dev)); |
73 | |
74 | t = wait_for_completion_interruptible_timeout(completion, HZ); |
75 | |
76 | if (t > 0) { |
77 | val = readw(hwmon->base) & 0xfff; |
78 | val = (val * 3300) >> 12; |
79 | ret = sprintf(buf, "%lu\n", val); |
80 | } else { |
81 | ret = t ? t : -ETIMEDOUT; |
82 | } |
83 | |
84 | hwmon->cell->disable(to_platform_device(dev)); |
85 | disable_irq(hwmon->irq); |
86 | |
87 | mutex_unlock(&hwmon->lock); |
88 | |
89 | return ret; |
90 | } |
91 | |
92 | static DEVICE_ATTR(name, S_IRUGO, jz4740_hwmon_show_name, NULL); |
93 | static DEVICE_ATTR(in0_input, S_IRUGO, jz4740_hwmon_read_adcin, NULL); |
94 | |
95 | static struct attribute *jz4740_hwmon_attributes[] = { |
96 | &dev_attr_name.attr, |
97 | &dev_attr_in0_input.attr, |
98 | NULL |
99 | }; |
100 | |
101 | static const struct attribute_group jz4740_hwmon_attr_group = { |
102 | .attrs = jz4740_hwmon_attributes, |
103 | }; |
104 | |
105 | static int jz4740_hwmon_probe(struct platform_device *pdev) |
106 | { |
107 | int ret; |
108 | struct jz4740_hwmon *hwmon; |
109 | |
110 | hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL); |
111 | if (!hwmon) |
112 | return -ENOMEM; |
113 | |
114 | hwmon->cell = mfd_get_cell(pdev); |
115 | |
116 | hwmon->irq = platform_get_irq(pdev, 0); |
117 | if (hwmon->irq < 0) { |
118 | dev_err(&pdev->dev, "Failed to get platform irq: %d\n", |
119 | hwmon->irq); |
120 | return hwmon->irq; |
121 | } |
122 | |
123 | hwmon->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
124 | if (!hwmon->mem) { |
125 | dev_err(&pdev->dev, "Failed to get platform mmio resource\n"); |
126 | return -ENOENT; |
127 | } |
128 | |
129 | hwmon->mem = devm_request_mem_region(&pdev->dev, hwmon->mem->start, |
130 | resource_size(hwmon->mem), pdev->name); |
131 | if (!hwmon->mem) { |
132 | dev_err(&pdev->dev, "Failed to request mmio memory region\n"); |
133 | return -EBUSY; |
134 | } |
135 | |
136 | hwmon->base = devm_ioremap_nocache(&pdev->dev, hwmon->mem->start, |
137 | resource_size(hwmon->mem)); |
138 | if (!hwmon->base) { |
139 | dev_err(&pdev->dev, "Failed to ioremap mmio memory\n"); |
140 | return -EBUSY; |
141 | } |
142 | |
143 | init_completion(&hwmon->read_completion); |
144 | mutex_init(&hwmon->lock); |
145 | |
146 | platform_set_drvdata(pdev, hwmon); |
147 | |
148 | ret = devm_request_irq(&pdev->dev, hwmon->irq, jz4740_hwmon_irq, 0, |
149 | pdev->name, hwmon); |
150 | if (ret) { |
151 | dev_err(&pdev->dev, "Failed to request irq: %d\n", ret); |
152 | return ret; |
153 | } |
154 | disable_irq(hwmon->irq); |
155 | |
156 | ret = sysfs_create_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group); |
157 | if (ret) { |
158 | dev_err(&pdev->dev, "Failed to create sysfs group: %d\n", ret); |
159 | return ret; |
160 | } |
161 | |
162 | hwmon->hwmon = hwmon_device_register(&pdev->dev); |
163 | if (IS_ERR(hwmon->hwmon)) { |
164 | ret = PTR_ERR(hwmon->hwmon); |
165 | goto err_remove_file; |
166 | } |
167 | |
168 | return 0; |
169 | |
170 | err_remove_file: |
171 | sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group); |
172 | return ret; |
173 | } |
174 | |
175 | static int jz4740_hwmon_remove(struct platform_device *pdev) |
176 | { |
177 | struct jz4740_hwmon *hwmon = platform_get_drvdata(pdev); |
178 | |
179 | hwmon_device_unregister(hwmon->hwmon); |
180 | sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group); |
181 | |
182 | return 0; |
183 | } |
184 | |
185 | static struct platform_driver jz4740_hwmon_driver = { |
186 | .probe = jz4740_hwmon_probe, |
187 | .remove = jz4740_hwmon_remove, |
188 | .driver = { |
189 | .name = "jz4740-hwmon", |
190 | .owner = THIS_MODULE, |
191 | }, |
192 | }; |
193 | |
194 | module_platform_driver(jz4740_hwmon_driver); |
195 | |
196 | MODULE_DESCRIPTION("JZ4740 SoC HWMON driver"); |
197 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); |
198 | MODULE_LICENSE("GPL"); |
199 | MODULE_ALIAS("platform:jz4740-hwmon"); |
200 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9