diff options
| -rw-r--r-- | drivers/power/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/power/max14577_charger.c | 311 | ||||
| -rw-r--r-- | include/linux/mfd/max14577-private.h | 19 | ||||
| -rw-r--r-- | include/linux/mfd/max14577.h | 7 |
4 files changed, 310 insertions, 28 deletions
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index 69fa8a9ef7a6..04e1d2fe2201 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -327,6 +327,7 @@ config CHARGER_MANAGER config CHARGER_MAX14577 tristate "Maxim MAX14577/77836 battery charger driver" depends on MFD_MAX14577 + select SYSFS help Say Y to enable support for the battery charger control sysfs and platform data of MAX14577/77836 MUICs. diff --git a/drivers/power/max14577_charger.c b/drivers/power/max14577_charger.c index 193530549b1f..0a2bc7277026 100644 --- a/drivers/power/max14577_charger.c +++ b/drivers/power/max14577_charger.c @@ -19,6 +19,7 @@ #include <linux/platform_device.h> #include <linux/power_supply.h> #include <linux/mfd/max14577-private.h> +#include <linux/mfd/max14577.h> struct max14577_charger { struct device *dev; @@ -27,6 +28,8 @@ struct max14577_charger { unsigned int charging_state; unsigned int battery_state; + + struct max14577_charger_platform_data *pdata; }; /* @@ -178,15 +181,131 @@ static int max14577_get_present(struct max14577_charger *chg) return 1; } +static int max14577_set_fast_charge_timer(struct max14577_charger *chg, + unsigned long hours) +{ + u8 reg_data; + + switch (hours) { + case 5 ... 7: + reg_data = hours - 3; + break; + case 0: + /* Disable */ + reg_data = 0x7; + break; + default: + dev_err(chg->dev, "Wrong value for Fast-Charge Timer: %lu\n", + hours); + return -EINVAL; + } + reg_data <<= CHGCTRL1_TCHW_SHIFT; + + return max14577_update_reg(chg->max14577->regmap, + MAX14577_REG_CHGCTRL1, CHGCTRL1_TCHW_MASK, reg_data); +} + +static int max14577_init_constant_voltage(struct max14577_charger *chg, + unsigned int uvolt) +{ + u8 reg_data; + + if (uvolt < MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN || + uvolt > MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX) + return -EINVAL; + + if (uvolt == 4200000) + reg_data = 0x0; + else if (uvolt == MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX) + reg_data = 0x1f; + else if (uvolt <= 4280000) { + unsigned int val = uvolt; + + val -= MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN; + val /= MAXIM_CHARGER_CONSTANT_VOLTAGE_STEP; + if (uvolt <= 4180000) + reg_data = 0x1 + val; + else + reg_data = val; /* Fix for gap between 4.18V and 4.22V */ + } else + return -EINVAL; + + reg_data <<= CHGCTRL3_MBCCVWRC_SHIFT; + + return max14577_write_reg(chg->max14577->regmap, + MAX14577_CHG_REG_CHG_CTRL3, reg_data); +} + +static int max14577_init_eoc(struct max14577_charger *chg, + unsigned int uamp) +{ + unsigned int current_bits = 0xf; + u8 reg_data; + + switch (chg->max14577->dev_type) { + case MAXIM_DEVICE_TYPE_MAX77836: + if (uamp < 5000) + return -EINVAL; /* Requested current is too low */ + + if (uamp >= 7500 && uamp < 10000) + current_bits = 0x0; + else if (uamp <= 50000) { + /* <5000, 7499> and <10000, 50000> */ + current_bits = uamp / 5000; + } else { + uamp = min(uamp, 100000U) - 50000U; + current_bits = 0xa + uamp / 10000; + } + break; + + case MAXIM_DEVICE_TYPE_MAX14577: + default: + if (uamp < MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN) + return -EINVAL; /* Requested current is too low */ + + uamp = min(uamp, MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX); + uamp -= MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN; + current_bits = uamp / MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP; + break; + } + + reg_data = current_bits << CHGCTRL5_EOCS_SHIFT; + + return max14577_update_reg(chg->max14577->regmap, + MAX14577_CHG_REG_CHG_CTRL5, CHGCTRL5_EOCS_MASK, + reg_data); +} + +static int max14577_init_fast_charge(struct max14577_charger *chg, + unsigned int uamp) +{ + u8 reg_data; + int ret; + const struct maxim_charger_current *limits = + &maxim_charger_currents[chg->max14577->dev_type]; + + ret = maxim_charger_calc_reg_current(limits, uamp, uamp, ®_data); + if (ret) { + dev_err(chg->dev, "Wrong value for fast charge: %u\n", uamp); + return ret; + } + + return max14577_update_reg(chg->max14577->regmap, + MAX14577_CHG_REG_CHG_CTRL4, + CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK, + reg_data); +} + /* * Sets charger registers to proper and safe default values. * Some of these values are equal to defaults in MAX14577E * data sheet but there are minor differences. */ -static void max14577_charger_reg_init(struct max14577_charger *chg) +static int max14577_charger_reg_init(struct max14577_charger *chg) { struct regmap *rmap = chg->max14577->regmap; u8 reg_data; + int ret; /* * Charger-Type Manual Detection, default off (set CHGTYPMAN to 0) @@ -198,10 +317,6 @@ static void max14577_charger_reg_init(struct max14577_charger *chg) CDETCTRL1_CHGDETEN_MASK | CDETCTRL1_CHGTYPMAN_MASK, reg_data); - /* Battery Fast-Charge Timer, set to: 6hrs */ - reg_data = 0x3 << CHGCTRL1_TCHW_SHIFT; - max14577_write_reg(rmap, MAX14577_REG_CHGCTRL1, reg_data); - /* * Wall-Adapter Rapid Charge, default on * Battery-Charger, default on @@ -210,32 +325,46 @@ static void max14577_charger_reg_init(struct max14577_charger *chg) reg_data |= 0x1 << CHGCTRL2_MBCHOSTEN_SHIFT; max14577_write_reg(rmap, MAX14577_REG_CHGCTRL2, reg_data); - /* Battery-Charger Constant Voltage (CV) Mode, set to: 4.35V */ - reg_data = 0xf << CHGCTRL3_MBCCVWRC_SHIFT; - max14577_write_reg(rmap, MAX14577_REG_CHGCTRL3, reg_data); - - /* - * Fast Battery-Charge Current Low, - * default 200-950mA (max14577) / 100-475mA (max77836) - * - * Fast Battery-Charge Current High, - * set to 450mA (max14577) / 225mA (max77836) - */ - reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT; - reg_data |= 0x5 << CHGCTRL4_MBCICHWRCH_SHIFT; - max14577_write_reg(rmap, MAX14577_REG_CHGCTRL4, reg_data); - - /* End-of-Charge Current, set to 50mA (max14577) / 7.5mA (max77836) */ - reg_data = 0x0 << CHGCTRL5_EOCS_SHIFT; - max14577_write_reg(rmap, MAX14577_REG_CHGCTRL5, reg_data); - /* Auto Charging Stop, default off */ reg_data = 0x0 << CHGCTRL6_AUTOSTOP_SHIFT; max14577_write_reg(rmap, MAX14577_REG_CHGCTRL6, reg_data); - /* Overvoltage-Protection Threshold, set to 6.5V */ - reg_data = 0x2 << CHGCTRL7_OTPCGHCVS_SHIFT; + ret = max14577_init_constant_voltage(chg, chg->pdata->constant_uvolt); + if (ret) + return ret; + + ret = max14577_init_eoc(chg, chg->pdata->eoc_uamp); + if (ret) + return ret; + + ret = max14577_init_fast_charge(chg, chg->pdata->fast_charge_uamp); + if (ret) + return ret; + + ret = max14577_set_fast_charge_timer(chg, + MAXIM_CHARGER_FAST_CHARGE_TIMER_DEFAULT); + if (ret) + return ret; + + /* Initialize Overvoltage-Protection Threshold */ + switch (chg->pdata->ovp_uvolt) { + case 7500000: + reg_data = 0x0; + break; + case 6000000: + case 6500000: + case 7000000: + reg_data = 0x1 + (chg->pdata->ovp_uvolt - 6000000) / 500000; + break; + default: + dev_err(chg->dev, "Wrong value for OVP: %u\n", + chg->pdata->ovp_uvolt); + return -EINVAL; + } + reg_data <<= CHGCTRL7_OTPCGHCVS_SHIFT; max14577_write_reg(rmap, MAX14577_REG_CHGCTRL7, reg_data); + + return 0; } /* Support property from charger */ @@ -295,6 +424,110 @@ static int max14577_charger_get_property(struct power_supply *psy, return ret; } +#ifdef CONFIG_OF +static struct max14577_charger_platform_data *max14577_charger_dt_init( + struct platform_device *pdev) +{ + struct max14577_charger_platform_data *pdata; + struct device_node *np = pdev->dev.of_node; + int ret; + + if (!np) { + dev_err(&pdev->dev, "No charger OF node\n"); + return ERR_PTR(-EINVAL); + } + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + + ret = of_property_read_u32(np, "maxim,constant-uvolt", + &pdata->constant_uvolt); + if (ret) { + dev_err(&pdev->dev, "Cannot parse maxim,constant-uvolt field from DT\n"); + return ERR_PTR(ret); + } + + ret = of_property_read_u32(np, "maxim,fast-charge-uamp", + &pdata->fast_charge_uamp); + if (ret) { + dev_err(&pdev->dev, "Cannot parse maxim,fast-charge-uamp field from DT\n"); + return ERR_PTR(ret); + } + + ret = of_property_read_u32(np, "maxim,eoc-uamp", &pdata->eoc_uamp); + if (ret) { + dev_err(&pdev->dev, "Cannot parse maxim,eoc-uamp field from DT\n"); + return ERR_PTR(ret); + } + + ret = of_property_read_u32(np, "maxim,ovp-uvolt", &pdata->ovp_uvolt); + if (ret) { + dev_err(&pdev->dev, "Cannot parse maxim,ovp-uvolt field from DT\n"); + return ERR_PTR(ret); + } + + return pdata; +} +#else /* CONFIG_OF */ +static struct max14577_charger_platform_data *max14577_charger_dt_init( + struct platform_device *pdev) +{ + return NULL; +} +#endif /* CONFIG_OF */ + +static ssize_t show_fast_charge_timer(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct max14577_charger *chg = dev_get_drvdata(dev); + u8 reg_data; + int ret; + unsigned int val; + + ret = max14577_read_reg(chg->max14577->regmap, MAX14577_REG_CHGCTRL1, + ®_data); + if (ret) + return ret; + + reg_data &= CHGCTRL1_TCHW_MASK; + reg_data >>= CHGCTRL1_TCHW_SHIFT; + switch (reg_data) { + case 0x2 ... 0x4: + val = reg_data + 3; + break; + case 0x7: + val = 0; + break; + default: + val = 5; + break; + } + + return scnprintf(buf, PAGE_SIZE, "%u\n", val); +} + +static ssize_t store_fast_charge_timer(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct max14577_charger *chg = dev_get_drvdata(dev); + unsigned long val; + int ret; + + ret = kstrtoul(buf, 10, &val); + if (ret) + return ret; + + ret = max14577_set_fast_charge_timer(chg, val); + if (ret) + return ret; + + return count; +} + +static DEVICE_ATTR(fast_charge_timer, S_IRUGO | S_IWUSR, + show_fast_charge_timer, store_fast_charge_timer); + static int max14577_charger_probe(struct platform_device *pdev) { struct max14577_charger *chg; @@ -309,7 +542,13 @@ static int max14577_charger_probe(struct platform_device *pdev) chg->dev = &pdev->dev; chg->max14577 = max14577; - max14577_charger_reg_init(chg); + chg->pdata = max14577_charger_dt_init(pdev); + if (IS_ERR_OR_NULL(chg->pdata)) + return PTR_ERR(chg->pdata); + + ret = max14577_charger_reg_init(chg); + if (ret) + return ret; chg->charger.name = "max14577-charger", chg->charger.type = POWER_SUPPLY_TYPE_BATTERY, @@ -317,19 +556,35 @@ static int max14577_charger_probe(struct platform_device *pdev) chg->charger.num_properties = ARRAY_SIZE(max14577_charger_props), chg->charger.get_property = max14577_charger_get_property, + ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer); + if (ret) { + dev_err(&pdev->dev, "failed: create sysfs entry\n"); + return ret; + } + ret = power_supply_register(&pdev->dev, &chg->charger); if (ret) { dev_err(&pdev->dev, "failed: power supply register\n"); - return ret; + goto err; } + /* Check for valid values for charger */ + BUILD_BUG_ON(MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN + + MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP * 0xf != + MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX); return 0; + +err: + device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer); + + return ret; } static int max14577_charger_remove(struct platform_device *pdev) { struct max14577_charger *chg = platform_get_drvdata(pdev); + device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer); power_supply_unregister(&chg->charger); return 0; diff --git a/include/linux/mfd/max14577-private.h b/include/linux/mfd/max14577-private.h index 7d514839c764..f01c1fae4d84 100644 --- a/include/linux/mfd/max14577-private.h +++ b/include/linux/mfd/max14577-private.h @@ -293,6 +293,25 @@ enum max14577_charger_reg { #define MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP 25000U #define MAX77836_CHARGER_CURRENT_LIMIT_MAX 475000U +/* + * MAX14577 charger End-Of-Charge current limits + * (as in CHGCTRL5 register), uA + */ +#define MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN 50000U +#define MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP 10000U +#define MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX 200000U + +/* + * MAX14577/MAX77836 Battery Constant Voltage + * (as in CHGCTRL3 register), uV + */ +#define MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN 4000000U +#define MAXIM_CHARGER_CONSTANT_VOLTAGE_STEP 20000U +#define MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX 4350000U + +/* Default value for fast charge timer, in hours */ +#define MAXIM_CHARGER_FAST_CHARGE_TIMER_DEFAULT 5 + /* MAX14577 regulator SFOUT LDO voltage, fixed, uV */ #define MAX14577_REGULATOR_SAFEOUT_VOLTAGE 4900000 diff --git a/include/linux/mfd/max14577.h b/include/linux/mfd/max14577.h index 3c098d57b1d1..ccfaf952c31b 100644 --- a/include/linux/mfd/max14577.h +++ b/include/linux/mfd/max14577.h @@ -54,6 +54,13 @@ struct max14577_regulator_platform_data { struct device_node *of_node; }; +struct max14577_charger_platform_data { + u32 constant_uvolt; + u32 fast_charge_uamp; + u32 eoc_uamp; + u32 ovp_uvolt; +}; + /* * MAX14577 MFD platform data */ |