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authorRamakrishna Pallala <ramakrishna.pallala@intel.com>2012-06-20 03:45:05 +0400
committerAnton Vorontsov <cbouatmailru@gmail.com>2012-06-20 03:47:37 +0400
commit19dd6bcd1136d254c1f12b0f69e827c3e1679b43 (patch)
treec27dd38e0f712e6e98923ca4727b87d06f64078e /drivers/power/smb347-charger.c
parent3824c47714f28091f74ca2505146514b4da1f390 (diff)
downloadlinux-19dd6bcd1136d254c1f12b0f69e827c3e1679b43.tar.xz
smb347-charger: Add constant charge and current properties
This patch makes use of the two new properties in smb347 charger driver. Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com> Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
Diffstat (limited to 'drivers/power/smb347-charger.c')
-rw-r--r--drivers/power/smb347-charger.c123
1 files changed, 117 insertions, 6 deletions
diff --git a/drivers/power/smb347-charger.c b/drivers/power/smb347-charger.c
index f8eedd8a676f..332dd0110bda 100644
--- a/drivers/power/smb347-charger.c
+++ b/drivers/power/smb347-charger.c
@@ -196,6 +196,14 @@ static const unsigned int ccc_tbl[] = {
1200000,
};
+/* Convert register value to current using lookup table */
+static int hw_to_current(const unsigned int *tbl, size_t size, unsigned int val)
+{
+ if (val >= size)
+ return -EINVAL;
+ return tbl[val];
+}
+
/* Convert current to register value using lookup table */
static int current_to_hw(const unsigned int *tbl, size_t size, unsigned int val)
{
@@ -841,22 +849,101 @@ fail:
return ret;
}
+/*
+ * Returns the constant charge current programmed
+ * into the charger in uA.
+ */
+static int get_const_charge_current(struct smb347_charger *smb)
+{
+ int ret, intval;
+ unsigned int v;
+
+ if (!smb347_is_ps_online(smb))
+ return -ENODATA;
+
+ ret = regmap_read(smb->regmap, STAT_B, &v);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * The current value is composition of FCC and PCC values
+ * and we can detect which table to use from bit 5.
+ */
+ if (v & 0x20) {
+ intval = hw_to_current(fcc_tbl, ARRAY_SIZE(fcc_tbl), v & 7);
+ } else {
+ v >>= 3;
+ intval = hw_to_current(pcc_tbl, ARRAY_SIZE(pcc_tbl), v & 7);
+ }
+
+ return intval;
+}
+
+/*
+ * Returns the constant charge voltage programmed
+ * into the charger in uV.
+ */
+static int get_const_charge_voltage(struct smb347_charger *smb)
+{
+ int ret, intval;
+ unsigned int v;
+
+ if (!smb347_is_ps_online(smb))
+ return -ENODATA;
+
+ ret = regmap_read(smb->regmap, STAT_A, &v);
+ if (ret < 0)
+ return ret;
+
+ v &= STAT_A_FLOAT_VOLTAGE_MASK;
+ if (v > 0x3d)
+ v = 0x3d;
+
+ intval = 3500000 + v * 20000;
+
+ return intval;
+}
+
static int smb347_mains_get_property(struct power_supply *psy,
enum power_supply_property prop,
union power_supply_propval *val)
{
struct smb347_charger *smb =
container_of(psy, struct smb347_charger, mains);
+ int ret;
- if (prop == POWER_SUPPLY_PROP_ONLINE) {
+ switch (prop) {
+ case POWER_SUPPLY_PROP_ONLINE:
val->intval = smb->mains_online;
- return 0;
+ break;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ ret = get_const_charge_voltage(smb);
+ if (ret < 0)
+ return ret;
+ else
+ val->intval = ret;
+ break;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ ret = get_const_charge_current(smb);
+ if (ret < 0)
+ return ret;
+ else
+ val->intval = ret;
+ break;
+
+ default:
+ return -EINVAL;
}
- return -EINVAL;
+
+ return 0;
}
static enum power_supply_property smb347_mains_properties[] = {
POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
};
static int smb347_usb_get_property(struct power_supply *psy,
@@ -865,16 +952,40 @@ static int smb347_usb_get_property(struct power_supply *psy,
{
struct smb347_charger *smb =
container_of(psy, struct smb347_charger, usb);
+ int ret;
- if (prop == POWER_SUPPLY_PROP_ONLINE) {
+ switch (prop) {
+ case POWER_SUPPLY_PROP_ONLINE:
val->intval = smb->usb_online;
- return 0;
+ break;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ ret = get_const_charge_voltage(smb);
+ if (ret < 0)
+ return ret;
+ else
+ val->intval = ret;
+ break;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ ret = get_const_charge_current(smb);
+ if (ret < 0)
+ return ret;
+ else
+ val->intval = ret;
+ break;
+
+ default:
+ return -EINVAL;
}
- return -EINVAL;
+
+ return 0;
}
static enum power_supply_property smb347_usb_properties[] = {
POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
};
static int smb347_battery_get_property(struct power_supply *psy,