forked from luck/tmp_suning_uos_patched
ACPI: thinkpad-acpi: driver sysfs conversion
Add the sysfs attributes for the platform driver. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Signed-off-by: Len Brown <len.brown@intel.com>
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@ -101,11 +101,39 @@ follow all sysfs guidelines and correctly process all errors (the sysfs
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interface makes extensive use of errors). File descriptors and open /
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close operations to the sysfs inodes must also be properly implemented.
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Driver version -- /proc/acpi/ibm/driver
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---------------------------------------
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The version of thinkpad-acpi's sysfs interface is exported by the driver
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as a driver attribute (see below).
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Sysfs driver attributes are on the driver's sysfs attribute space,
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for 2.6.20 this is /sys/bus/platform/drivers/thinkpad-acpi/.
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Sysfs device attributes are on the driver's sysfs attribute space,
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for 2.6.20 this is /sys/devices/platform/thinkpad-acpi/.
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Driver version
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--------------
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procfs: /proc/acpi/ibm/driver
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sysfs driver attribute: version
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The driver name and version. No commands can be written to this file.
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Sysfs interface version
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-----------------------
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sysfs driver attribute: interface_version
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Version of the thinkpad-acpi sysfs interface, as an unsigned long
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(output in hex format: 0xAAAABBCC), where:
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AAAA - major revision
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BB - minor revision
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CC - bugfix revision
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The sysfs interface version changelog for the driver can be found at the
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end of this document. Changes to the sysfs interface done by the kernel
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subsystems are not documented here, nor are they tracked by this
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attribute.
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Hot keys -- /proc/acpi/ibm/hotkey
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---------------------------------
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@ -745,9 +773,19 @@ to enable more than one output class, just add their values.
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There is also a kernel build option to enable more debugging
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information, which may be necessary to debug driver problems.
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The level of debugging information output by the driver can be changed
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at runtime through sysfs, using the driver attribute debug_level. The
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attribute takes the same bitmask as the debug module parameter above.
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Force loading of module
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-----------------------
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If thinkpad-acpi refuses to detect your ThinkPad, you can try to specify
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the module parameter force_load=1. Regardless of whether this works or
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not, please contact ibm-acpi-devel@lists.sourceforge.net with a report.
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Sysfs interface changelog:
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0x000100: Initial sysfs support, as a single platform driver and
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device.
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@ -22,6 +22,7 @@
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*/
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#define IBM_VERSION "0.14"
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#define TPACPI_SYSFS_VERSION 0x000100
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/*
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* Changelog:
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@ -493,6 +494,87 @@ static struct platform_driver tpacpi_pdriver = {
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};
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/*************************************************************************
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* thinkpad-acpi driver attributes
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*/
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/* interface_version --------------------------------------------------- */
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static ssize_t tpacpi_driver_interface_version_show(
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struct device_driver *drv,
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char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "0x%08x\n", TPACPI_SYSFS_VERSION);
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}
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static DRIVER_ATTR(interface_version, S_IRUGO,
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tpacpi_driver_interface_version_show, NULL);
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/* debug_level --------------------------------------------------------- */
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static ssize_t tpacpi_driver_debug_show(struct device_driver *drv,
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char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "0x%04x\n", dbg_level);
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}
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static ssize_t tpacpi_driver_debug_store(struct device_driver *drv,
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const char *buf, size_t count)
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{
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unsigned long t;
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char *endp;
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t = simple_strtoul(buf, &endp, 0);
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while (*endp && isspace(*endp))
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endp++;
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if (*endp)
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return -EINVAL;
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dbg_level = t;
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return count;
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}
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static DRIVER_ATTR(debug_level, S_IWUSR | S_IRUGO,
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tpacpi_driver_debug_show, tpacpi_driver_debug_store);
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/* version ------------------------------------------------------------- */
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static ssize_t tpacpi_driver_version_show(struct device_driver *drv,
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char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%s v%s\n", IBM_DESC, IBM_VERSION);
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}
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static DRIVER_ATTR(version, S_IRUGO,
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tpacpi_driver_version_show, NULL);
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/* --------------------------------------------------------------------- */
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static struct driver_attribute* tpacpi_driver_attributes[] = {
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&driver_attr_debug_level, &driver_attr_version,
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&driver_attr_interface_version,
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};
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static int __init tpacpi_create_driver_attributes(struct device_driver *drv)
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{
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int i, res;
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i = 0;
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res = 0;
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while (!res && i < ARRAY_SIZE(tpacpi_driver_attributes)) {
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res = driver_create_file(drv, tpacpi_driver_attributes[i]);
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i++;
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}
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return res;
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}
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static void tpacpi_remove_driver_attributes(struct device_driver *drv)
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{
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int i;
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for(i = 0; i < ARRAY_SIZE(tpacpi_driver_attributes); i++)
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driver_remove_file(drv, tpacpi_driver_attributes[i]);
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}
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/****************************************************************************
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****************************************************************************
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*
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@ -3268,6 +3350,13 @@ static int __init thinkpad_acpi_module_init(void)
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thinkpad_acpi_module_exit();
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return ret;
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}
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ret = tpacpi_create_driver_attributes(&tpacpi_pdriver.driver);
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if (ret) {
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printk(IBM_ERR "unable to create sysfs driver attributes\n");
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thinkpad_acpi_module_exit();
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return ret;
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}
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/* Device initialization */
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tpacpi_pdev = platform_device_register_simple(IBM_DRVR_NAME, -1,
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@ -3318,6 +3407,7 @@ static void thinkpad_acpi_module_exit(void)
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if (tpacpi_pdev)
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platform_device_unregister(tpacpi_pdev);
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tpacpi_remove_driver_attributes(&tpacpi_pdriver.driver);
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platform_driver_unregister(&tpacpi_pdriver);
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if (proc_dir)
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@ -32,6 +32,7 @@
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#include <linux/list.h>
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#include <linux/proc_fs.h>
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#include <linux/sysfs.h>
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#include <linux/backlight.h>
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#include <linux/fb.h>
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#include <linux/platform_device.h>
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@ -137,6 +138,8 @@ static char *next_cmd(char **cmds);
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static struct platform_device *tpacpi_pdev;
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static struct class_device *tpacpi_hwmon;
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static struct platform_driver tpacpi_pdriver;
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static int tpacpi_create_driver_attributes(struct device_driver *drv);
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static void tpacpi_remove_driver_attributes(struct device_driver *drv);
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/* Module */
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static int experimental;
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