Add support for battery charge thresholds in new Sandy Bridge and Ivy Bridge
ThinkPads. Based on the unofficial documentation in tpacpi-bat.
The threshold files support the values '0' for the controller's default,
and 1-99 as percentages. Values outside of that range are rejected. The
behaviour of '0' might be confusing, especially for the stop case where
it basically seems to mean '100'.
Signed-off-by: Julian Andres Klode <j...@jak-linux.org>
---
Does this look OK so far? There are some other things I want to add
(force_discharge and others), but I thought I'd gather some comments
in case I'm doing it all wrong...
I'm slightly abusing struct dev_ext_attribute here, as I'm storing the
battery number in the 'var' pointer.
Note that I export the batteries starting at BAT0, but the EC starts
counting at 1 (0 is reserved for setting all batteries at once, but
that functionality is not provided here).
drivers/platform/x86/thinkpad_acpi.c | 158 +++++++++++++++++++++++++++++++++++
1 file changed, 158 insertions(+)
diff --git a/drivers/platform/x86/thinkpad_acpi.c
b/drivers/platform/x86/thinkpad_acpi.c
index 03ca6c1..1e17222 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -528,6 +528,12 @@ static acpi_handle ec_handle;
TPACPI_HANDLE(ecrd, ec, "ECRD"); /* 570 */
TPACPI_HANDLE(ecwr, ec, "ECWR"); /* 570 */
+TPACPI_HANDLE(battery, root, "\\_SB.PCI0.LPC.EC.HKEY",
+ "\\_SB.PCI0.LPCB.EC.HKEY", /* X121e, T430u */
+ "\\_SB.PCI0.LPCB.H_EC.HKEY", /* L430 */
+ "\\_SB.PCI0.LPCB.EC0.HKEY", /* Edge/S series */
+ );
+
TPACPI_HANDLE(cmos, root, "\\UCMS", /* R50, R50e, R50p, R51, */
/* T4x, X31, X40 */
"\\CMOS", /* A3x, G4x, R32, T23, T30, X22-24, X30 */
@@ -8350,6 +8356,154 @@ static struct ibm_struct fan_driver_data = {
.resume = fan_resume,
};
+
+/*************************************************************************
+ * Battery subdriver
+ */
+
+/* Define a new battery, _BAT is a number >= 0 */
+#define DEFINE_BATTERY(_BAT) \
+static struct dev_ext_attribute bat##_BAT##_attribute_start_charge_thresh = { \
+ .attr = __ATTR(start_charge_tresh, (S_IWUSR | S_IRUGO), \
+ battery_start_charge_thresh_show, \
+ battery_start_charge_thresh_store), \
+ .var = (void *) (_BAT + 1) \
+}; \
+static struct dev_ext_attribute bat##_BAT##_attribute_stop_charge_thresh = { \
+ .attr = __ATTR(stop_charge_tresh, (S_IWUSR | S_IRUGO), \
+ battery_stop_charge_thresh_show, \
+ battery_stop_charge_thresh_store), \
+ .var = (void *) (_BAT + 1) \
+}; \
+static struct attribute *bat##_BAT##_attributes[] = { \
+ &bat##_BAT##_attribute_start_charge_thresh.attr.attr, \
+ &bat##_BAT##_attribute_stop_charge_thresh.attr.attr, \
+ NULL \
+}; \
+\
+static struct attribute_group bat##_BAT##_attribute_group = { \
+ .name = "BAT" #_BAT, \
+ .attrs = bat##_BAT##_attributes \
+};
+
+static int battery_attribute_get_battery(struct device_attribute *attr)
+{
+ return (int) (unsigned long) container_of(attr,
+ struct dev_ext_attribute,
+ attr)->var;
+}
+
+static ssize_t battery_start_charge_thresh_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int bat = battery_attribute_get_battery(attr);
+ int res = -EINVAL;
+ unsigned long value;
+
+ res = kstrtoul(buf, 0, &value);
+ if (res || value > 99)
+ return res ? res : -EINVAL;
+
+ if (!battery_handle || !acpi_evalf(battery_handle, &res, "BCCS",
+ "dd", (int) value | (bat << 8)))
+ return -EIO;
+
+ return count;
+}
+
+static ssize_t battery_stop_charge_thresh_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int bat = battery_attribute_get_battery(attr);
+ int res = -EINVAL;
+ unsigned long value;
+
+ res = kstrtoul(buf, 0, &value);
+ if (res || value > 99)
+ return res ? res : -EINVAL;
+
+ if (!battery_handle || !acpi_evalf(battery_handle, &res, "BCSS",
+ "dd", (int) value | (bat << 8)))
+ return -EIO;
+
+ return count;
+}
+
+static ssize_t battery_start_charge_thresh_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int bat = battery_attribute_get_battery(attr);
+ int value;
+
+ if (!battery_handle || !acpi_evalf(battery_handle, &value, "BCTG",
+ "dd", bat))
+ return -EIO;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", value & 0xFF);
+}
+
+static ssize_t battery_stop_charge_thresh_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int bat = battery_attribute_get_battery(attr);
+ int value;
+
+ if (!battery_handle || !acpi_evalf(battery_handle, &value, "BCSG",
+ "dd", bat))
+ return -EIO;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", value & 0xFF);
+}
+
+DEFINE_BATTERY(0);
+DEFINE_BATTERY(1);
+
+static struct attribute_group *bat_attribute_groups[] = {
+ &bat0_attribute_group,
+ &bat1_attribute_group,
+};
+
+static int __init battery_init(struct ibm_init_struct *iibm)
+{
+ int res;
+ int i;
+
+ vdbg_printk(TPACPI_DBG_INIT,
+ "initializing battery commands subdriver\n");
+
+ TPACPI_ACPIHANDLE_INIT(battery);
+
+ vdbg_printk(TPACPI_DBG_INIT, "battery commands are %s\n",
+ str_supported(battery_handle != NULL));
+
+ for (i = 0; i < ARRAY_SIZE(bat_attribute_groups); i++) {
+ res = sysfs_create_group(&tpacpi_pdev->dev.kobj,
+ bat_attribute_groups[i]);
+ if (res)
+ return res;
+ }
+
+ return (battery_handle) ? 0 : 1;
+}
+
+static void battery_exit(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(bat_attribute_groups); i++)
+ sysfs_remove_group(&tpacpi_pdev->dev.kobj,
+ bat_attribute_groups[i]);
+}
+
+static struct ibm_struct battery_driver_data = {
+ .name = "battery",
+ .exit = battery_exit,
+};
+
/****************************************************************************
****************************************************************************
*
@@ -8741,6 +8895,10 @@ static struct ibm_init_struct ibms_init[] __initdata = {
.data = &light_driver_data,
},
{
+ .init = battery_init,
+ .data = &battery_driver_data,
+ },
+ {
.init = cmos_init,
.data = &cmos_driver_data,
},
--
1.8.4.2
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