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path: root/drivers/power/ab8500_charger.c
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Diffstat (limited to 'drivers/power/ab8500_charger.c')
-rw-r--r--drivers/power/ab8500_charger.c198
1 files changed, 151 insertions, 47 deletions
diff --git a/drivers/power/ab8500_charger.c b/drivers/power/ab8500_charger.c
index e2b4accbec8..19f62729a0a 100644
--- a/drivers/power/ab8500_charger.c
+++ b/drivers/power/ab8500_charger.c
@@ -29,6 +29,7 @@
#include <linux/mfd/abx500/ab8500-gpadc.h>
#include <linux/mfd/abx500/ux500_chargalg.h>
#include <linux/usb/otg.h>
+#include <asm/mach-types.h>
/* Charger constants */
#define NO_PW_CONN 0
@@ -77,6 +78,9 @@
/* Lowest charger voltage is 3.39V -> 0x4E */
#define LOW_VOLT_REG 0x4E
+/* Step up/down delay in us */
+#define STEP_UDELAY 1000
+
/* UsbLineStatus register - usb types */
enum ab8500_charger_link_status {
USB_STAT_NOT_CONFIGURED,
@@ -934,6 +938,88 @@ static int ab8500_charger_get_usb_cur(struct ab8500_charger *di)
}
/**
+ * ab8500_charger_set_current() - set charger current
+ * @di: pointer to the ab8500_charger structure
+ * @ich: charger current, in mA
+ * @reg: select what charger register to set
+ *
+ * Set charger current.
+ * There is no state machine in the AB to step up/down the charger
+ * current to avoid dips and spikes on MAIN, VBUS and VBAT when
+ * charging is started. Instead we need to implement
+ * this charger current step-up/down here.
+ * Returns error code in case of failure else 0(on success)
+ */
+static int ab8500_charger_set_current(struct ab8500_charger *di,
+ int ich, int reg)
+{
+ int ret, i;
+ int curr_index, prev_curr_index, shift_value;
+ u8 reg_value;
+
+ switch (reg) {
+ case AB8500_MCH_IPT_CURLVL_REG:
+ shift_value = MAIN_CH_INPUT_CURR_SHIFT;
+ curr_index = ab8500_current_to_regval(ich);
+ break;
+ case AB8500_USBCH_IPT_CRNTLVL_REG:
+ shift_value = VBUS_IN_CURR_LIM_SHIFT;
+ curr_index = ab8500_vbus_in_curr_to_regval(ich);
+ break;
+ case AB8500_CH_OPT_CRNTLVL_REG:
+ shift_value = 0;
+ curr_index = ab8500_current_to_regval(ich);
+ break;
+ default:
+ dev_err(di->dev, "%s current register not valid\n", __func__);
+ return -ENXIO;
+ }
+
+ if (curr_index < 0) {
+ dev_err(di->dev, "requested current limit out-of-range\n");
+ return -ENXIO;
+ }
+
+ ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
+ reg, &reg_value);
+ if (ret < 0) {
+ dev_err(di->dev, "%s read failed\n", __func__);
+ return ret;
+ }
+ prev_curr_index = (reg_value >> shift_value);
+
+ /* only update current if it's been changed */
+ if (prev_curr_index == curr_index)
+ return 0;
+
+ dev_dbg(di->dev, "%s set charger current: %d mA for reg: 0x%02x\n",
+ __func__, ich, reg);
+
+ if (prev_curr_index > curr_index) {
+ for (i = prev_curr_index - 1; i >= curr_index; i--) {
+ ret = abx500_set_register_interruptible(di->dev,
+ AB8500_CHARGER, reg, (u8) i << shift_value);
+ if (ret) {
+ dev_err(di->dev, "%s write failed\n", __func__);
+ return ret;
+ }
+ usleep_range(STEP_UDELAY, STEP_UDELAY * 2);
+ }
+ } else {
+ for (i = prev_curr_index + 1; i <= curr_index; i++) {
+ ret = abx500_set_register_interruptible(di->dev,
+ AB8500_CHARGER, reg, (u8) i << shift_value);
+ if (ret) {
+ dev_err(di->dev, "%s write failed\n", __func__);
+ return ret;
+ }
+ usleep_range(STEP_UDELAY, STEP_UDELAY * 2);
+ }
+ }
+ return ret;
+}
+
+/**
* ab8500_charger_set_vbus_in_curr() - set VBUS input current limit
* @di: pointer to the ab8500_charger structure
* @ich_in: charger input current limit
@@ -944,8 +1030,6 @@ static int ab8500_charger_get_usb_cur(struct ab8500_charger *di)
static int ab8500_charger_set_vbus_in_curr(struct ab8500_charger *di,
int ich_in)
{
- int ret;
- int input_curr_index;
int min_value;
/* We should always use to lowest current limit */
@@ -964,19 +1048,38 @@ static int ab8500_charger_set_vbus_in_curr(struct ab8500_charger *di,
break;
}
- input_curr_index = ab8500_vbus_in_curr_to_regval(min_value);
- if (input_curr_index < 0) {
- dev_err(di->dev, "VBUS input current limit too high\n");
- return -ENXIO;
- }
+ return ab8500_charger_set_current(di, min_value,
+ AB8500_USBCH_IPT_CRNTLVL_REG);
+}
- ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
- AB8500_USBCH_IPT_CRNTLVL_REG,
- input_curr_index << VBUS_IN_CURR_LIM_SHIFT);
- if (ret)
- dev_err(di->dev, "%s write failed\n", __func__);
+/**
+ * ab8500_charger_set_main_in_curr() - set main charger input current
+ * @di: pointer to the ab8500_charger structure
+ * @ich_in: input charger current, in mA
+ *
+ * Set main charger input current.
+ * Returns error code in case of failure else 0(on success)
+ */
+static int ab8500_charger_set_main_in_curr(struct ab8500_charger *di,
+ int ich_in)
+{
+ return ab8500_charger_set_current(di, ich_in,
+ AB8500_MCH_IPT_CURLVL_REG);
+}
- return ret;
+/**
+ * ab8500_charger_set_output_curr() - set charger output current
+ * @di: pointer to the ab8500_charger structure
+ * @ich_out: output charger current, in mA
+ *
+ * Set charger output current.
+ * Returns error code in case of failure else 0(on success)
+ */
+static int ab8500_charger_set_output_curr(struct ab8500_charger *di,
+ int ich_out)
+{
+ return ab8500_charger_set_current(di, ich_out,
+ AB8500_CH_OPT_CRNTLVL_REG);
}
/**
@@ -1088,18 +1191,19 @@ static int ab8500_charger_ac_en(struct ux500_charger *charger,
return ret;
}
/* MainChInputCurr: current that can be drawn from the charger*/
- ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
- AB8500_MCH_IPT_CURLVL_REG,
- input_curr_index << MAIN_CH_INPUT_CURR_SHIFT);
+ ret = ab8500_charger_set_main_in_curr(di,
+ di->bat->chg_params->ac_curr_max);
if (ret) {
- dev_err(di->dev, "%s write failed\n", __func__);
+ dev_err(di->dev, "%s Failed to set MainChInputCurr\n",
+ __func__);
return ret;
}
/* ChOutputCurentLevel: protected output current */
- ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
- AB8500_CH_OPT_CRNTLVL_REG, (u8) curr_index);
+ ret = ab8500_charger_set_output_curr(di, iset);
if (ret) {
- dev_err(di->dev, "%s write failed\n", __func__);
+ dev_err(di->dev, "%s "
+ "Failed to set ChOutputCurentLevel\n",
+ __func__);
return ret;
}
@@ -1156,12 +1260,11 @@ static int ab8500_charger_ac_en(struct ux500_charger *charger,
return ret;
}
- ret = abx500_set_register_interruptible(di->dev,
- AB8500_CHARGER,
- AB8500_CH_OPT_CRNTLVL_REG, CH_OP_CUR_LVL_0P1);
+ ret = ab8500_charger_set_output_curr(di, 0);
if (ret) {
- dev_err(di->dev,
- "%s write failed\n", __func__);
+ dev_err(di->dev, "%s "
+ "Failed to set ChOutputCurentLevel\n",
+ __func__);
return ret;
}
} else {
@@ -1264,10 +1367,11 @@ static int ab8500_charger_usb_en(struct ux500_charger *charger,
return ret;
}
/* ChOutputCurentLevel: protected output current */
- ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
- AB8500_CH_OPT_CRNTLVL_REG, (u8) curr_index);
+ ret = ab8500_charger_set_output_curr(di, ich_out);
if (ret) {
- dev_err(di->dev, "%s write failed\n", __func__);
+ dev_err(di->dev, "%s "
+ "Failed to set ChOutputCurentLevel\n",
+ __func__);
return ret;
}
/* Check if VBAT overshoot control should be enabled */
@@ -1364,7 +1468,6 @@ static int ab8500_charger_update_charger_current(struct ux500_charger *charger,
int ich_out)
{
int ret;
- int curr_index;
struct ab8500_charger *di;
if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
@@ -1374,18 +1477,11 @@ static int ab8500_charger_update_charger_current(struct ux500_charger *charger,
else
return -ENXIO;
- curr_index = ab8500_current_to_regval(ich_out);
- if (curr_index < 0) {
- dev_err(di->dev,
- "Charger current too high, "
- "charging not started\n");
- return -ENXIO;
- }
-
- ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
- AB8500_CH_OPT_CRNTLVL_REG, (u8) curr_index);
+ ret = ab8500_charger_set_output_curr(di, ich_out);
if (ret) {
- dev_err(di->dev, "%s write failed\n", __func__);
+ dev_err(di->dev, "%s "
+ "Failed to set ChOutputCurentLevel\n",
+ __func__);
return ret;
}
@@ -2354,11 +2450,18 @@ static int ab8500_charger_init_hw_registers(struct ab8500_charger *di)
}
/* Backup battery voltage and current */
- ret = abx500_set_register_interruptible(di->dev,
- AB8500_RTC,
- AB8500_RTC_BACKUP_CHG_REG,
- di->bat->bkup_bat_v |
- di->bat->bkup_bat_i);
+ if (machine_is_snowball())
+ ret = abx500_set_register_interruptible(di->dev,
+ AB8500_RTC,
+ AB8500_RTC_BACKUP_CHG_REG,
+ BUP_VCH_SEL_3P1V |
+ BUP_ICH_SEL_150UA);
+ else
+ ret = abx500_set_register_interruptible(di->dev,
+ AB8500_RTC,
+ AB8500_RTC_BACKUP_CHG_REG,
+ di->bat->bkup_bat_v |
+ di->bat->bkup_bat_i);
if (ret) {
dev_err(di->dev, "failed to setup backup battery charging\n");
goto out;
@@ -2534,7 +2637,7 @@ static int __devexit ab8500_charger_remove(struct platform_device *pdev)
static int __devinit ab8500_charger_probe(struct platform_device *pdev)
{
int irq, i, charger_status, ret = 0;
- struct abx500_bm_plat_data *plat_data;
+ struct ab8500_platform_data *plat_data;
struct ab8500_charger *di =
kzalloc(sizeof(struct ab8500_charger), GFP_KERNEL);
@@ -2550,7 +2653,8 @@ static int __devinit ab8500_charger_probe(struct platform_device *pdev)
spin_lock_init(&di->usb_state.usb_lock);
/* get charger specific platform data */
- plat_data = pdev->dev.platform_data;
+ plat_data = dev_get_platdata(di->parent->dev);
+
di->pdata = plat_data->charger;
if (!di->pdata) {
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-16 21:42:02 +0000