target/linux/xburst/patches-2.6.35/057-hwmon.patch

   1 From 548ab33dc0bd3c824e6002936ae0931158658a19 Mon Sep 17 00:00:00 2001
   2 From: Lars-Peter Clausen <lars@metafoo.de>
   3 Date: Sat, 19 Jun 2010 18:32:58 +0000
   4 Subject: [PATCH] HWMON: Add JZ4740 ADC driver
   5
   6 Add support for reading the ADCIN pin of the ADC unit on JZ4740 SoCs.
   7
   8 Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
   9 Cc: lm-sensors@lm-sensors.org
  10 Acked-by: Jean Delvare <khali@linux-fr.org>
  11 Cc: linux-mips@linux-mips.org
  12 Cc: linux-kernel@vger.kernel.org
  13 Patchwork: https://patchwork.linux-mips.org/patch/1425/
  14 Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
  15 ---
  16  drivers/hwmon/Kconfig        |   10 ++
  17  drivers/hwmon/Makefile       |    1 +
  18  drivers/hwmon/jz4740-hwmon.c |  230 ++++++++++++++++++++++++++++++++++++++++++
  19  3 files changed, 241 insertions(+), 0 deletions(-)
  20  create mode 100644 drivers/hwmon/jz4740-hwmon.c
  21
  22 --- a/drivers/hwmon/Kconfig
  23 +++ b/drivers/hwmon/Kconfig
  24 @@ -446,6 +446,16 @@ config SENSORS_IT87
  25           This driver can also be built as a module.  If so, the module
  26           will be called it87.
  27
  28 +config SENSORS_JZ4740
  29 +       tristate "Ingenic JZ4740 SoC ADC driver"
  30 +       depends on MACH_JZ4740 && MFD_JZ4740_ADC
  31 +       help
  32 +         If you say yes here you get support for reading adc values from the ADCIN
  33 +         pin on Ingenic JZ4740 SoC based boards.
  34 +
  35 +         This driver can also be build as a module. If so, the module will be
  36 +         called jz4740-hwmon.
  37 +
  38  config SENSORS_LM63
  39         tristate "National Semiconductor LM63 and LM64"
  40         depends on I2C
  41 --- a/drivers/hwmon/Makefile
  42 +++ b/drivers/hwmon/Makefile
  43 @@ -55,6 +55,7 @@ obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb
  44  obj-$(CONFIG_SENSORS_IBMAEM)   += ibmaem.o
  45  obj-$(CONFIG_SENSORS_IBMPEX)   += ibmpex.o
  46  obj-$(CONFIG_SENSORS_IT87)     += it87.o
  47 +obj-$(CONFIG_SENSORS_JZ4740)   += jz4740-hwmon.o
  48  obj-$(CONFIG_SENSORS_K8TEMP)   += k8temp.o
  49  obj-$(CONFIG_SENSORS_K10TEMP)  += k10temp.o
  50  obj-$(CONFIG_SENSORS_LIS3LV02D) += lis3lv02d.o hp_accel.o
  51 --- /dev/null
  52 +++ b/drivers/hwmon/jz4740-hwmon.c
  53 @@ -0,0 +1,230 @@
  54 +/*
  55 + * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
  56 + * JZ4740 SoC HWMON driver
  57 + *
  58 + * This program is free software; you can redistribute it and/or modify it
  59 + * under  the terms of the GNU General  Public License as published by the
  60 + * Free Software Foundation;  either version 2 of the License, or (at your
  61 + * option) any later version.
  62 + *
  63 + * You should have received a copy of the GNU General Public License along
  64 + * with this program; if not, write to the Free Software Foundation, Inc.,
  65 + * 675 Mass Ave, Cambridge, MA 02139, USA.
  66 + *
  67 + */
  68 +
  69 +#include <linux/err.h>
  70 +#include <linux/interrupt.h>
  71 +#include <linux/kernel.h>
  72 +#include <linux/module.h>
  73 +#include <linux/mutex.h>
  74 +#include <linux/platform_device.h>
  75 +#include <linux/slab.h>
  76 +
  77 +#include <linux/completion.h>
  78 +#include <linux/mfd/core.h>
  79 +
  80 +#include <linux/hwmon.h>
  81 +
  82 +struct jz4740_hwmon {
  83 +       struct resource *mem;
  84 +       void __iomem *base;
  85 +
  86 +       int irq;
  87 +
  88 +       struct mfd_cell *cell;
  89 +       struct device *hwmon;
  90 +
  91 +       struct completion read_completion;
  92 +
  93 +       struct mutex lock;
  94 +};
  95 +
  96 +static ssize_t jz4740_hwmon_show_name(struct device *dev,
  97 +       struct device_attribute *dev_attr, char *buf)
  98 +{
  99 +       return sprintf(buf, "jz4740\n");
 100 +}
 101 +
 102 +static irqreturn_t jz4740_hwmon_irq(int irq, void *data)
 103 +{
 104 +       struct jz4740_hwmon *hwmon = data;
 105 +
 106 +       complete(&hwmon->read_completion);
 107 +       return IRQ_HANDLED;
 108 +}
 109 +
 110 +static ssize_t jz4740_hwmon_read_adcin(struct device *dev,
 111 +       struct device_attribute *dev_attr, char *buf)
 112 +{
 113 +       struct jz4740_hwmon *hwmon = dev_get_drvdata(dev);
 114 +       struct completion *completion = &hwmon->read_completion;
 115 +       unsigned long t;
 116 +       unsigned long val;
 117 +       int ret;
 118 +
 119 +       mutex_lock(&hwmon->lock);
 120 +
 121 +       INIT_COMPLETION(*completion);
 122 +
 123 +       enable_irq(hwmon->irq);
 124 +       hwmon->cell->enable(to_platform_device(dev));
 125 +
 126 +       t = wait_for_completion_interruptible_timeout(completion, HZ);
 127 +
 128 +       if (t > 0) {
 129 +               val = readw(hwmon->base) & 0xfff;
 130 +               val = (val * 3300) >> 12;
 131 +               ret = sprintf(buf, "%lu\n", val);
 132 +       } else {
 133 +               ret = t ? t : -ETIMEDOUT;
 134 +       }
 135 +
 136 +       hwmon->cell->disable(to_platform_device(dev));
 137 +       disable_irq(hwmon->irq);
 138 +
 139 +       mutex_unlock(&hwmon->lock);
 140 +
 141 +       return ret;
 142 +}
 143 +
 144 +static DEVICE_ATTR(name, S_IRUGO, jz4740_hwmon_show_name, NULL);
 145 +static DEVICE_ATTR(in0_input, S_IRUGO, jz4740_hwmon_read_adcin, NULL);
 146 +
 147 +static struct attribute *jz4740_hwmon_attributes[] = {
 148 +       &dev_attr_name.attr,
 149 +       &dev_attr_in0_input.attr,
 150 +       NULL
 151 +};
 152 +
 153 +static const struct attribute_group jz4740_hwmon_attr_group = {
 154 +       .attrs = jz4740_hwmon_attributes,
 155 +};
 156 +
 157 +static int __devinit jz4740_hwmon_probe(struct platform_device *pdev)
 158 +{
 159 +       int ret;
 160 +       struct jz4740_hwmon *hwmon;
 161 +
 162 +       hwmon = kmalloc(sizeof(*hwmon), GFP_KERNEL);
 163 +       if (!hwmon) {
 164 +               dev_err(&pdev->dev, "Failed to allocate driver structure\n");
 165 +               return -ENOMEM;
 166 +       }
 167 +
 168 +       hwmon->cell = pdev->dev.platform_data;
 169 +
 170 +       hwmon->irq = platform_get_irq(pdev, 0);
 171 +       if (hwmon->irq < 0) {
 172 +               ret = hwmon->irq;
 173 +               dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
 174 +               goto err_free;
 175 +       }
 176 +
 177 +       hwmon->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 178 +       if (!hwmon->mem) {
 179 +               ret = -ENOENT;
 180 +               dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
 181 +               goto err_free;
 182 +       }
 183 +
 184 +       hwmon->mem = request_mem_region(hwmon->mem->start,
 185 +                       resource_size(hwmon->mem), pdev->name);
 186 +       if (!hwmon->mem) {
 187 +               ret = -EBUSY;
 188 +               dev_err(&pdev->dev, "Failed to request mmio memory region\n");
 189 +               goto err_free;
 190 +       }
 191 +
 192 +       hwmon->base = ioremap_nocache(hwmon->mem->start,
 193 +                       resource_size(hwmon->mem));
 194 +       if (!hwmon->base) {
 195 +               ret = -EBUSY;
 196 +               dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
 197 +               goto err_release_mem_region;
 198 +       }
 199 +
 200 +       init_completion(&hwmon->read_completion);
 201 +       mutex_init(&hwmon->lock);
 202 +
 203 +       platform_set_drvdata(pdev, hwmon);
 204 +
 205 +       ret = request_irq(hwmon->irq, jz4740_hwmon_irq, 0, pdev->name, hwmon);
 206 +       if (ret) {
 207 +               dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
 208 +               goto err_iounmap;
 209 +       }
 210 +       disable_irq(hwmon->irq);
 211 +
 212 +       ret = sysfs_create_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
 213 +       if (ret) {
 214 +               dev_err(&pdev->dev, "Failed to create sysfs group: %d\n", ret);
 215 +               goto err_free_irq;
 216 +       }
 217 +
 218 +       hwmon->hwmon = hwmon_device_register(&pdev->dev);
 219 +       if (IS_ERR(hwmon->hwmon)) {
 220 +               ret = PTR_ERR(hwmon->hwmon);
 221 +               goto err_remove_file;
 222 +       }
 223 +
 224 +       return 0;
 225 +
 226 +err_remove_file:
 227 +       sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
 228 +err_free_irq:
 229 +       free_irq(hwmon->irq, hwmon);
 230 +err_iounmap:
 231 +       platform_set_drvdata(pdev, NULL);
 232 +       iounmap(hwmon->base);
 233 +err_release_mem_region:
 234 +       release_mem_region(hwmon->mem->start, resource_size(hwmon->mem));
 235 +err_free:
 236 +       kfree(hwmon);
 237 +
 238 +       return ret;
 239 +}
 240 +
 241 +static int __devexit jz4740_hwmon_remove(struct platform_device *pdev)
 242 +{
 243 +       struct jz4740_hwmon *hwmon = platform_get_drvdata(pdev);
 244 +
 245 +       hwmon_device_unregister(hwmon->hwmon);
 246 +       sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
 247 +
 248 +       free_irq(hwmon->irq, hwmon);
 249 +
 250 +       iounmap(hwmon->base);
 251 +       release_mem_region(hwmon->mem->start, resource_size(hwmon->mem));
 252 +
 253 +       platform_set_drvdata(pdev, NULL);
 254 +       kfree(hwmon);
 255 +
 256 +       return 0;
 257 +}
 258 +
 259 +struct platform_driver jz4740_hwmon_driver = {
 260 +       .probe  = jz4740_hwmon_probe,
 261 +       .remove = __devexit_p(jz4740_hwmon_remove),
 262 +       .driver = {
 263 +               .name = "jz4740-hwmon",
 264 +               .owner = THIS_MODULE,
 265 +       },
 266 +};
 267 +
 268 +static int __init jz4740_hwmon_init(void)
 269 +{
 270 +       return platform_driver_register(&jz4740_hwmon_driver);
 271 +}
 272 +module_init(jz4740_hwmon_init);
 273 +
 274 +static void __exit jz4740_hwmon_exit(void)
 275 +{
 276 +       platform_driver_unregister(&jz4740_hwmon_driver);
 277 +}
 278 +module_exit(jz4740_hwmon_exit);
 279 +
 280 +MODULE_DESCRIPTION("JZ4740 SoC HWMON driver");
 281 +MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 282 +MODULE_LICENSE("GPL");
 283 +MODULE_ALIAS("platform:jz4740-hwmon");