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7f983ba9 LPC |
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> | |
b25df2bf | 23 | #include <linux/io.h> |
7f983ba9 LPC |
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 | ||
e9300066 | 36 | const struct mfd_cell *cell; |
7f983ba9 LPC |
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; | |
0b57d760 | 63 | long t; |
7f983ba9 LPC |
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 | ||
6c931ae1 | 105 | static int jz4740_hwmon_probe(struct platform_device *pdev) |
7f983ba9 LPC |
106 | { |
107 | int ret; | |
108 | struct jz4740_hwmon *hwmon; | |
109 | ||
b25df2bf GR |
110 | hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL); |
111 | if (!hwmon) | |
7f983ba9 | 112 | return -ENOMEM; |
7f983ba9 | 113 | |
6a54ac21 | 114 | hwmon->cell = mfd_get_cell(pdev); |
7f983ba9 LPC |
115 | |
116 | hwmon->irq = platform_get_irq(pdev, 0); | |
117 | if (hwmon->irq < 0) { | |
b25df2bf GR |
118 | dev_err(&pdev->dev, "Failed to get platform irq: %d\n", |
119 | hwmon->irq); | |
120 | return hwmon->irq; | |
7f983ba9 LPC |
121 | } |
122 | ||
123 | hwmon->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
124 | if (!hwmon->mem) { | |
7f983ba9 | 125 | dev_err(&pdev->dev, "Failed to get platform mmio resource\n"); |
b25df2bf | 126 | return -ENOENT; |
7f983ba9 LPC |
127 | } |
128 | ||
b25df2bf | 129 | hwmon->mem = devm_request_mem_region(&pdev->dev, hwmon->mem->start, |
7f983ba9 LPC |
130 | resource_size(hwmon->mem), pdev->name); |
131 | if (!hwmon->mem) { | |
7f983ba9 | 132 | dev_err(&pdev->dev, "Failed to request mmio memory region\n"); |
b25df2bf | 133 | return -EBUSY; |
7f983ba9 LPC |
134 | } |
135 | ||
b25df2bf GR |
136 | hwmon->base = devm_ioremap_nocache(&pdev->dev, hwmon->mem->start, |
137 | resource_size(hwmon->mem)); | |
7f983ba9 | 138 | if (!hwmon->base) { |
7f983ba9 | 139 | dev_err(&pdev->dev, "Failed to ioremap mmio memory\n"); |
b25df2bf | 140 | return -EBUSY; |
7f983ba9 LPC |
141 | } |
142 | ||
143 | init_completion(&hwmon->read_completion); | |
144 | mutex_init(&hwmon->lock); | |
145 | ||
146 | platform_set_drvdata(pdev, hwmon); | |
147 | ||
b25df2bf GR |
148 | ret = devm_request_irq(&pdev->dev, hwmon->irq, jz4740_hwmon_irq, 0, |
149 | pdev->name, hwmon); | |
7f983ba9 LPC |
150 | if (ret) { |
151 | dev_err(&pdev->dev, "Failed to request irq: %d\n", ret); | |
b25df2bf | 152 | return ret; |
7f983ba9 LPC |
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); | |
b25df2bf | 159 | return ret; |
7f983ba9 LPC |
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); | |
7f983ba9 LPC |
172 | return ret; |
173 | } | |
174 | ||
281dfd0b | 175 | static int jz4740_hwmon_remove(struct platform_device *pdev) |
7f983ba9 LPC |
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 | ||
7f983ba9 LPC |
182 | return 0; |
183 | } | |
184 | ||
d6c4f2ac | 185 | static struct platform_driver jz4740_hwmon_driver = { |
7f983ba9 | 186 | .probe = jz4740_hwmon_probe, |
9e5e9b7a | 187 | .remove = jz4740_hwmon_remove, |
7f983ba9 LPC |
188 | .driver = { |
189 | .name = "jz4740-hwmon", | |
190 | .owner = THIS_MODULE, | |
191 | }, | |
192 | }; | |
193 | ||
25a236a5 | 194 | module_platform_driver(jz4740_hwmon_driver); |
7f983ba9 LPC |
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"); |