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path: root/drivers/power/max17042_battery.c
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Diffstat (limited to 'drivers/power/max17042_battery.c')
-rw-r--r--drivers/power/max17042_battery.c508
1 files changed, 477 insertions, 31 deletions
diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c
index 86acee2..04620c2 100644
--- a/drivers/power/max17042_battery.c
+++ b/drivers/power/max17042_battery.c
@@ -26,14 +26,47 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
#include <linux/mod_devicetable.h>
#include <linux/power_supply.h>
#include <linux/power/max17042_battery.h>
+#include <linux/of.h>
+
+/* Status register bits */
+#define STATUS_POR_BIT (1 << 1)
+#define STATUS_BST_BIT (1 << 3)
+#define STATUS_VMN_BIT (1 << 8)
+#define STATUS_TMN_BIT (1 << 9)
+#define STATUS_SMN_BIT (1 << 10)
+#define STATUS_BI_BIT (1 << 11)
+#define STATUS_VMX_BIT (1 << 12)
+#define STATUS_TMX_BIT (1 << 13)
+#define STATUS_SMX_BIT (1 << 14)
+#define STATUS_BR_BIT (1 << 15)
+
+/* Interrupt mask bits */
+#define CONFIG_ALRT_BIT_ENBL (1 << 2)
+#define STATUS_INTR_SOCMIN_BIT (1 << 10)
+#define STATUS_INTR_SOCMAX_BIT (1 << 14)
+
+#define VFSOC0_LOCK 0x0000
+#define VFSOC0_UNLOCK 0x0080
+#define MODEL_UNLOCK1 0X0059
+#define MODEL_UNLOCK2 0X00C4
+#define MODEL_LOCK1 0X0000
+#define MODEL_LOCK2 0X0000
+
+#define dQ_ACC_DIV 0x4
+#define dP_ACC_100 0x1900
+#define dP_ACC_200 0x3200
struct max17042_chip {
struct i2c_client *client;
struct power_supply battery;
struct max17042_platform_data *pdata;
+ struct work_struct work;
+ int init_complete;
};
static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value)
@@ -87,6 +120,9 @@ static int max17042_get_property(struct power_supply *psy,
struct max17042_chip, battery);
int ret;
+ if (!chip->init_complete)
+ return -EAGAIN;
+
switch (psp) {
case POWER_SUPPLY_PROP_PRESENT:
ret = max17042_read_reg(chip->client, MAX17042_STATUS);
@@ -136,21 +172,18 @@ static int max17042_get_property(struct power_supply *psy,
val->intval = ret * 625 / 8;
break;
case POWER_SUPPLY_PROP_CAPACITY:
- ret = max17042_read_reg(chip->client, MAX17042_SOC);
+ ret = max17042_read_reg(chip->client, MAX17042_RepSOC);
if (ret < 0)
return ret;
val->intval = ret >> 8;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
- ret = max17042_read_reg(chip->client, MAX17042_RepSOC);
+ ret = max17042_read_reg(chip->client, MAX17042_FullCAP);
if (ret < 0)
return ret;
- if ((ret >> 8) >= MAX17042_BATTERY_FULL)
- val->intval = 1;
- else if (ret >= 0)
- val->intval = 0;
+ val->intval = ret * 1000 / 2;
break;
case POWER_SUPPLY_PROP_TEMP:
ret = max17042_read_reg(chip->client, MAX17042_TEMP);
@@ -210,22 +243,419 @@ static int max17042_get_property(struct power_supply *psy,
return 0;
}
+static int max17042_write_verify_reg(struct i2c_client *client,
+ u8 reg, u16 value)
+{
+ int retries = 8;
+ int ret;
+ u16 read_value;
+
+ do {
+ ret = i2c_smbus_write_word_data(client, reg, value);
+ read_value = max17042_read_reg(client, reg);
+ if (read_value != value) {
+ ret = -EIO;
+ retries--;
+ }
+ } while (retries && read_value != value);
+
+ if (ret < 0)
+ dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+
+ return ret;
+}
+
+static inline void max17042_override_por(
+ struct i2c_client *client, u8 reg, u16 value)
+{
+ if (value)
+ max17042_write_reg(client, reg, value);
+}
+
+static inline void max10742_unlock_model(struct max17042_chip *chip)
+{
+ struct i2c_client *client = chip->client;
+ max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
+ max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
+}
+
+static inline void max10742_lock_model(struct max17042_chip *chip)
+{
+ struct i2c_client *client = chip->client;
+ max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_LOCK1);
+ max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_LOCK2);
+}
+
+static inline void max17042_write_model_data(struct max17042_chip *chip,
+ u8 addr, int size)
+{
+ struct i2c_client *client = chip->client;
+ int i;
+ for (i = 0; i < size; i++)
+ max17042_write_reg(client, addr + i,
+ chip->pdata->config_data->cell_char_tbl[i]);
+}
+
+static inline void max17042_read_model_data(struct max17042_chip *chip,
+ u8 addr, u16 *data, int size)
+{
+ struct i2c_client *client = chip->client;
+ int i;
+
+ for (i = 0; i < size; i++)
+ data[i] = max17042_read_reg(client, addr + i);
+}
+
+static inline int max17042_model_data_compare(struct max17042_chip *chip,
+ u16 *data1, u16 *data2, int size)
+{
+ int i;
+
+ if (memcmp(data1, data2, size)) {
+ dev_err(&chip->client->dev, "%s compare failed\n", __func__);
+ for (i = 0; i < size; i++)
+ dev_info(&chip->client->dev, "0x%x, 0x%x",
+ data1[i], data2[i]);
+ dev_info(&chip->client->dev, "\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int max17042_init_model(struct max17042_chip *chip)
+{
+ int ret;
+ int table_size =
+ sizeof(chip->pdata->config_data->cell_char_tbl)/sizeof(u16);
+ u16 *temp_data;
+
+ temp_data = kzalloc(table_size, GFP_KERNEL);
+ if (!temp_data)
+ return -ENOMEM;
+
+ max10742_unlock_model(chip);
+ max17042_write_model_data(chip, MAX17042_MODELChrTbl,
+ table_size);
+ max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
+ table_size);
+
+ ret = max17042_model_data_compare(
+ chip,
+ chip->pdata->config_data->cell_char_tbl,
+ temp_data,
+ table_size);
+
+ max10742_lock_model(chip);
+ kfree(temp_data);
+
+ return ret;
+}
+
+static int max17042_verify_model_lock(struct max17042_chip *chip)
+{
+ int i;
+ int table_size =
+ sizeof(chip->pdata->config_data->cell_char_tbl);
+ u16 *temp_data;
+ int ret = 0;
+
+ temp_data = kzalloc(table_size, GFP_KERNEL);
+ if (!temp_data)
+ return -ENOMEM;
+
+ max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
+ table_size);
+ for (i = 0; i < table_size; i++)
+ if (temp_data[i])
+ ret = -EINVAL;
+
+ kfree(temp_data);
+ return ret;
+}
+
+static void max17042_write_config_regs(struct max17042_chip *chip)
+{
+ struct max17042_config_data *config = chip->pdata->config_data;
+
+ max17042_write_reg(chip->client, MAX17042_CONFIG, config->config);
+ max17042_write_reg(chip->client, MAX17042_LearnCFG, config->learn_cfg);
+ max17042_write_reg(chip->client, MAX17042_FilterCFG,
+ config->filter_cfg);
+ max17042_write_reg(chip->client, MAX17042_RelaxCFG, config->relax_cfg);
+}
+
+static void max17042_write_custom_regs(struct max17042_chip *chip)
+{
+ struct max17042_config_data *config = chip->pdata->config_data;
+
+ max17042_write_verify_reg(chip->client, MAX17042_RCOMP0,
+ config->rcomp0);
+ max17042_write_verify_reg(chip->client, MAX17042_TempCo,
+ config->tcompc0);
+ max17042_write_reg(chip->client, MAX17042_EmptyTempCo,
+ config->empty_tempco);
+ max17042_write_verify_reg(chip->client, MAX17042_K_empty0,
+ config->kempty0);
+ max17042_write_verify_reg(chip->client, MAX17042_ICHGTerm,
+ config->ichgt_term);
+}
+
+static void max17042_update_capacity_regs(struct max17042_chip *chip)
+{
+ struct max17042_config_data *config = chip->pdata->config_data;
+
+ max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
+ config->fullcap);
+ max17042_write_reg(chip->client, MAX17042_DesignCap,
+ config->design_cap);
+ max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
+ config->fullcapnom);
+}
+
+static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
+{
+ u16 vfSoc;
+
+ vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
+ max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
+ max17042_write_verify_reg(chip->client, MAX17042_VFSOC0, vfSoc);
+ max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
+}
+
+static void max17042_load_new_capacity_params(struct max17042_chip *chip)
+{
+ u16 full_cap0, rep_cap, dq_acc, vfSoc;
+ u32 rem_cap;
+
+ struct max17042_config_data *config = chip->pdata->config_data;
+
+ full_cap0 = max17042_read_reg(chip->client, MAX17042_FullCAP0);
+ vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
+
+ /* fg_vfSoc needs to shifted by 8 bits to get the
+ * perc in 1% accuracy, to get the right rem_cap multiply
+ * full_cap0, fg_vfSoc and devide by 100
+ */
+ rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
+ max17042_write_verify_reg(chip->client, MAX17042_RemCap, (u16)rem_cap);
+
+ rep_cap = (u16)rem_cap;
+ max17042_write_verify_reg(chip->client, MAX17042_RepCap, rep_cap);
+
+ /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
+ dq_acc = config->fullcap / dQ_ACC_DIV;
+ max17042_write_verify_reg(chip->client, MAX17042_dQacc, dq_acc);
+ max17042_write_verify_reg(chip->client, MAX17042_dPacc, dP_ACC_200);
+
+ max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
+ config->fullcap);
+ max17042_write_reg(chip->client, MAX17042_DesignCap,
+ config->design_cap);
+ max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
+ config->fullcapnom);
+}
+
+/*
+ * Block write all the override values coming from platform data.
+ * This function MUST be called before the POR initialization proceedure
+ * specified by maxim.
+ */
+static inline void max17042_override_por_values(struct max17042_chip *chip)
+{
+ struct i2c_client *client = chip->client;
+ struct max17042_config_data *config = chip->pdata->config_data;
+
+ max17042_override_por(client, MAX17042_TGAIN, config->tgain);
+ max17042_override_por(client, MAx17042_TOFF, config->toff);
+ max17042_override_por(client, MAX17042_CGAIN, config->cgain);
+ max17042_override_por(client, MAX17042_COFF, config->coff);
+
+ max17042_override_por(client, MAX17042_VALRT_Th, config->valrt_thresh);
+ max17042_override_por(client, MAX17042_TALRT_Th, config->talrt_thresh);
+ max17042_override_por(client, MAX17042_SALRT_Th,
+ config->soc_alrt_thresh);
+ max17042_override_por(client, MAX17042_CONFIG, config->config);
+ max17042_override_por(client, MAX17042_SHDNTIMER, config->shdntimer);
+
+ max17042_override_por(client, MAX17042_DesignCap, config->design_cap);
+ max17042_override_por(client, MAX17042_ICHGTerm, config->ichgt_term);
+
+ max17042_override_por(client, MAX17042_AtRate, config->at_rate);
+ max17042_override_por(client, MAX17042_LearnCFG, config->learn_cfg);
+ max17042_override_por(client, MAX17042_FilterCFG, config->filter_cfg);
+ max17042_override_por(client, MAX17042_RelaxCFG, config->relax_cfg);
+ max17042_override_por(client, MAX17042_MiscCFG, config->misc_cfg);
+ max17042_override_por(client, MAX17042_MaskSOC, config->masksoc);
+
+ max17042_override_por(client, MAX17042_FullCAP, config->fullcap);
+ max17042_override_por(client, MAX17042_FullCAPNom, config->fullcapnom);
+ max17042_override_por(client, MAX17042_SOC_empty, config->socempty);
+ max17042_override_por(client, MAX17042_LAvg_empty, config->lavg_empty);
+ max17042_override_por(client, MAX17042_dQacc, config->dqacc);
+ max17042_override_por(client, MAX17042_dPacc, config->dpacc);
+
+ max17042_override_por(client, MAX17042_V_empty, config->vempty);
+ max17042_override_por(client, MAX17042_TempNom, config->temp_nom);
+ max17042_override_por(client, MAX17042_TempLim, config->temp_lim);
+ max17042_override_por(client, MAX17042_FCTC, config->fctc);
+ max17042_override_por(client, MAX17042_RCOMP0, config->rcomp0);
+ max17042_override_por(client, MAX17042_TempCo, config->tcompc0);
+ max17042_override_por(client, MAX17042_EmptyTempCo,
+ config->empty_tempco);
+ max17042_override_por(client, MAX17042_K_empty0, config->kempty0);
+}
+
+static int max17042_init_chip(struct max17042_chip *chip)
+{
+ int ret;
+ int val;
+
+ max17042_override_por_values(chip);
+ /* After Power up, the MAX17042 requires 500mS in order
+ * to perform signal debouncing and initial SOC reporting
+ */
+ msleep(500);
+
+ /* Initialize configaration */
+ max17042_write_config_regs(chip);
+
+ /* write cell characterization data */
+ ret = max17042_init_model(chip);
+ if (ret) {
+ dev_err(&chip->client->dev, "%s init failed\n",
+ __func__);
+ return -EIO;
+ }
+ max17042_verify_model_lock(chip);
+ if (ret) {
+ dev_err(&chip->client->dev, "%s lock verify failed\n",
+ __func__);
+ return -EIO;
+ }
+ /* write custom parameters */
+ max17042_write_custom_regs(chip);
+
+ /* update capacity params */
+ max17042_update_capacity_regs(chip);
+
+ /* delay must be atleast 350mS to allow VFSOC
+ * to be calculated from the new configuration
+ */
+ msleep(350);
+
+ /* reset vfsoc0 reg */
+ max17042_reset_vfsoc0_reg(chip);
+
+ /* load new capacity params */
+ max17042_load_new_capacity_params(chip);
+
+ /* Init complete, Clear the POR bit */
+ val = max17042_read_reg(chip->client, MAX17042_STATUS);
+ max17042_write_reg(chip->client, MAX17042_STATUS,
+ val & (~STATUS_POR_BIT));
+ return 0;
+}
+
+static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
+{
+ u16 soc, soc_tr;
+
+ /* program interrupt thesholds such that we should
+ * get interrupt for every 'off' perc change in the soc
+ */
+ soc = max17042_read_reg(chip->client, MAX17042_RepSOC) >> 8;
+ soc_tr = (soc + off) << 8;
+ soc_tr |= (soc - off);
+ max17042_write_reg(chip->client, MAX17042_SALRT_Th, soc_tr);
+}
+
+static irqreturn_t max17042_thread_handler(int id, void *dev)
+{
+ struct max17042_chip *chip = dev;
+ u16 val;
+
+ val = max17042_read_reg(chip->client, MAX17042_STATUS);
+ if ((val & STATUS_INTR_SOCMIN_BIT) ||
+ (val & STATUS_INTR_SOCMAX_BIT)) {
+ dev_info(&chip->client->dev, "SOC threshold INTR\n");
+ max17042_set_soc_threshold(chip, 1);
+ }
+
+ power_supply_changed(&chip->battery);
+ return IRQ_HANDLED;
+}
+
+static void max17042_init_worker(struct work_struct *work)
+{
+ struct max17042_chip *chip = container_of(work,
+ struct max17042_chip, work);
+ int ret;
+
+ /* Initialize registers according to values from the platform data */
+ if (chip->pdata->enable_por_init && chip->pdata->config_data) {
+ ret = max17042_init_chip(chip);
+ if (ret)
+ return;
+ }
+
+ chip->init_complete = 1;
+}
+
+#ifdef CONFIG_OF
+static struct max17042_platform_data *
+max17042_get_pdata(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ u32 prop;
+ struct max17042_platform_data *pdata;
+
+ if (!np)
+ return dev->platform_data;
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ /*
+ * Require current sense resistor value to be specified for
+ * current-sense functionality to be enabled at all.
+ */
+ if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
+ pdata->r_sns = prop;
+ pdata->enable_current_sense = true;
+ }
+
+ return pdata;
+}
+#else
+static struct max17042_platform_data *
+max17042_get_pdata(struct device *dev)
+{
+ return dev->platform_data;
+}
+#endif
+
static int __devinit max17042_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct max17042_chip *chip;
int ret;
+ int reg;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
return -EIO;
- chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+ chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->client = client;
- chip->pdata = client->dev.platform_data;
+ chip->pdata = max17042_get_pdata(&client->dev);
+ if (!chip->pdata) {
+ dev_err(&client->dev, "no platform data provided\n");
+ return -EINVAL;
+ }
i2c_set_clientdata(client, chip);
@@ -243,17 +673,9 @@ static int __devinit max17042_probe(struct i2c_client *client,
if (chip->pdata->r_sns == 0)
chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
- ret = power_supply_register(&client->dev, &chip->battery);
- if (ret) {
- dev_err(&client->dev, "failed: power supply register\n");
- kfree(chip);
- return ret;
- }
-
- /* Initialize registers according to values from the platform data */
if (chip->pdata->init_data)
max17042_set_reg(client, chip->pdata->init_data,
- chip->pdata->num_init_data);
+ chip->pdata->num_init_data);
if (!chip->pdata->enable_current_sense) {
max17042_write_reg(client, MAX17042_CGAIN, 0x0000);
@@ -261,7 +683,34 @@ static int __devinit max17042_probe(struct i2c_client *client,
max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
}
- return 0;
+ if (client->irq) {
+ ret = request_threaded_irq(client->irq, NULL,
+ max17042_thread_handler,
+ IRQF_TRIGGER_FALLING,
+ chip->battery.name, chip);
+ if (!ret) {
+ reg = max17042_read_reg(client, MAX17042_CONFIG);
+ reg |= CONFIG_ALRT_BIT_ENBL;
+ max17042_write_reg(client, MAX17042_CONFIG, reg);
+ max17042_set_soc_threshold(chip, 1);
+ } else
+ dev_err(&client->dev, "%s(): cannot get IRQ\n",
+ __func__);
+ }
+
+ reg = max17042_read_reg(chip->client, MAX17042_STATUS);
+
+ if (reg & STATUS_POR_BIT) {
+ INIT_WORK(&chip->work, max17042_init_worker);
+ schedule_work(&chip->work);
+ } else {
+ chip->init_complete = 1;
+ }
+
+ ret = power_supply_register(&client->dev, &chip->battery);
+ if (ret)
+ dev_err(&client->dev, "failed: power supply register\n");
+ return ret;
}
static int __devexit max17042_remove(struct i2c_client *client)
@@ -269,10 +718,17 @@ static int __devexit max17042_remove(struct i2c_client *client)
struct max17042_chip *chip = i2c_get_clientdata(client);
power_supply_unregister(&chip->battery);
- kfree(chip);
return 0;
}
+#ifdef CONFIG_OF
+static const struct of_device_id max17042_dt_match[] = {
+ { .compatible = "maxim,max17042" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, max17042_dt_match);
+#endif
+
static const struct i2c_device_id max17042_id[] = {
{ "max17042", 0 },
{ }
@@ -282,23 +738,13 @@ MODULE_DEVICE_TABLE(i2c, max17042_id);
static struct i2c_driver max17042_i2c_driver = {
.driver = {
.name = "max17042",
+ .of_match_table = of_match_ptr(max17042_dt_match),
},
.probe = max17042_probe,
.remove = __devexit_p(max17042_remove),
.id_table = max17042_id,
};
-
-static int __init max17042_init(void)
-{
- return i2c_add_driver(&max17042_i2c_driver);
-}
-module_init(max17042_init);
-
-static void __exit max17042_exit(void)
-{
- i2c_del_driver(&max17042_i2c_driver);
-}
-module_exit(max17042_exit);
+module_i2c_driver(max17042_i2c_driver);
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_DESCRIPTION("MAX17042 Fuel Gauge");