diff options
Diffstat (limited to 'drivers/power/supply/gpio-charger.c')
| -rw-r--r-- | drivers/power/supply/gpio-charger.c | 172 |
1 files changed, 143 insertions, 29 deletions
diff --git a/drivers/power/supply/gpio-charger.c b/drivers/power/supply/gpio-charger.c index 875735d50716..68212b39785b 100644 --- a/drivers/power/supply/gpio-charger.c +++ b/drivers/power/supply/gpio-charger.c @@ -5,7 +5,6 @@ */ #include <linux/device.h> -#include <linux/gpio.h> /* For legacy platform data */ #include <linux/init.h> #include <linux/interrupt.h> #include <linux/kernel.h> @@ -18,7 +17,13 @@ #include <linux/power/gpio-charger.h> +struct gpio_mapping { + u32 limit_ua; + u32 gpiodata; +} __packed; + struct gpio_charger { + struct device *dev; unsigned int irq; unsigned int charge_status_irq; bool wakeup_enabled; @@ -27,6 +32,11 @@ struct gpio_charger { struct power_supply_desc charger_desc; struct gpio_desc *gpiod; struct gpio_desc *charge_status; + + struct gpio_descs *current_limit_gpios; + struct gpio_mapping *current_limit_map; + u32 current_limit_map_size; + u32 charge_current_limit; }; static irqreturn_t gpio_charger_irq(int irq, void *devid) @@ -43,6 +53,35 @@ static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy) return power_supply_get_drvdata(psy); } +static int set_charge_current_limit(struct gpio_charger *gpio_charger, int val) +{ + struct gpio_mapping mapping; + int ndescs = gpio_charger->current_limit_gpios->ndescs; + struct gpio_desc **gpios = gpio_charger->current_limit_gpios->desc; + int i; + + if (!gpio_charger->current_limit_map_size) + return -EINVAL; + + for (i = 0; i < gpio_charger->current_limit_map_size; i++) { + if (gpio_charger->current_limit_map[i].limit_ua <= val) + break; + } + mapping = gpio_charger->current_limit_map[i]; + + for (i = 0; i < ndescs; i++) { + bool val = (mapping.gpiodata >> i) & 1; + gpiod_set_value_cansleep(gpios[ndescs-i-1], val); + } + + gpio_charger->charge_current_limit = mapping.limit_ua; + + dev_dbg(gpio_charger->dev, "set charge current limit to %d (requested: %d)\n", + gpio_charger->charge_current_limit, val); + + return 0; +} + static int gpio_charger_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { @@ -58,6 +97,24 @@ static int gpio_charger_get_property(struct power_supply *psy, else val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; break; + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: + val->intval = gpio_charger->charge_current_limit; + break; + default: + return -EINVAL; + } + + return 0; +} + +static int gpio_charger_set_property(struct power_supply *psy, + enum power_supply_property psp, const union power_supply_propval *val) +{ + struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy); + + switch (psp) { + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: + return set_charge_current_limit(gpio_charger, val->intval); default: return -EINVAL; } @@ -65,6 +122,19 @@ static int gpio_charger_get_property(struct power_supply *psy, return 0; } +static int gpio_charger_property_is_writeable(struct power_supply *psy, + enum power_supply_property psp) +{ + switch (psp) { + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: + return 1; + default: + break; + } + + return 0; +} + static enum power_supply_type gpio_charger_get_type(struct device *dev) { const char *chargetype; @@ -112,6 +182,61 @@ static int gpio_charger_get_irq(struct device *dev, void *dev_id, return irq; } +static int init_charge_current_limit(struct device *dev, + struct gpio_charger *gpio_charger) +{ + int i, len; + u32 cur_limit = U32_MAX; + + gpio_charger->current_limit_gpios = devm_gpiod_get_array_optional(dev, + "charge-current-limit", GPIOD_OUT_LOW); + if (IS_ERR(gpio_charger->current_limit_gpios)) { + dev_err(dev, "error getting current-limit GPIOs\n"); + return PTR_ERR(gpio_charger->current_limit_gpios); + } + + if (!gpio_charger->current_limit_gpios) + return 0; + + len = device_property_read_u32_array(dev, "charge-current-limit-mapping", + NULL, 0); + if (len < 0) + return len; + + if (len == 0 || len % 2) { + dev_err(dev, "invalid charge-current-limit-mapping length\n"); + return -EINVAL; + } + + gpio_charger->current_limit_map = devm_kmalloc_array(dev, + len / 2, sizeof(*gpio_charger->current_limit_map), GFP_KERNEL); + if (!gpio_charger->current_limit_map) + return -ENOMEM; + + gpio_charger->current_limit_map_size = len / 2; + + len = device_property_read_u32_array(dev, "charge-current-limit-mapping", + (u32*) gpio_charger->current_limit_map, len); + if (len < 0) + return len; + + for (i=0; i < gpio_charger->current_limit_map_size; i++) { + if (gpio_charger->current_limit_map[i].limit_ua > cur_limit) { + dev_err(dev, "charge-current-limit-mapping not sorted by current in descending order\n"); + return -EINVAL; + } + + cur_limit = gpio_charger->current_limit_map[i].limit_ua; + } + + /* default to smallest current limitation for safety reasons */ + len = gpio_charger->current_limit_map_size - 1; + set_charge_current_limit(gpio_charger, + gpio_charger->current_limit_map[len].limit_ua); + + return 0; +} + /* * The entries will be overwritten by driver's probe routine depending * on the available features. This list ensures, that the array is big @@ -120,6 +245,7 @@ static int gpio_charger_get_irq(struct device *dev, void *dev_id, static enum power_supply_property gpio_charger_properties[] = { POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, }; static int gpio_charger_probe(struct platform_device *pdev) @@ -131,7 +257,6 @@ static int gpio_charger_probe(struct platform_device *pdev) struct power_supply_desc *charger_desc; struct gpio_desc *charge_status; int charge_status_irq; - unsigned long flags; int ret; int num_props = 0; @@ -143,40 +268,17 @@ static int gpio_charger_probe(struct platform_device *pdev) gpio_charger = devm_kzalloc(dev, sizeof(*gpio_charger), GFP_KERNEL); if (!gpio_charger) return -ENOMEM; + gpio_charger->dev = dev; /* * This will fetch a GPIO descriptor from device tree, ACPI or * boardfile descriptor tables. It's good to try this first. */ gpio_charger->gpiod = devm_gpiod_get_optional(dev, NULL, GPIOD_IN); - - /* - * Fallback to legacy platform data method, if no GPIO is specified - * using boardfile descriptor tables. - */ - if (!gpio_charger->gpiod && pdata) { - /* Non-DT: use legacy GPIO numbers */ - if (!gpio_is_valid(pdata->gpio)) { - dev_err(dev, "Invalid gpio pin in pdata\n"); - return -EINVAL; - } - flags = GPIOF_IN; - if (pdata->gpio_active_low) - flags |= GPIOF_ACTIVE_LOW; - ret = devm_gpio_request_one(dev, pdata->gpio, flags, - dev_name(dev)); - if (ret) { - dev_err(dev, "Failed to request gpio pin: %d\n", ret); - return ret; - } - /* Then convert this to gpiod for now */ - gpio_charger->gpiod = gpio_to_desc(pdata->gpio); - } else if (IS_ERR(gpio_charger->gpiod)) { + if (IS_ERR(gpio_charger->gpiod)) { /* Just try again if this happens */ - if (PTR_ERR(gpio_charger->gpiod) == -EPROBE_DEFER) - return -EPROBE_DEFER; - dev_err(dev, "error getting GPIO descriptor\n"); - return PTR_ERR(gpio_charger->gpiod); + return dev_err_probe(dev, PTR_ERR(gpio_charger->gpiod), + "error getting GPIO descriptor\n"); } if (gpio_charger->gpiod) { @@ -193,10 +295,22 @@ static int gpio_charger_probe(struct platform_device *pdev) num_props++; } + ret = init_charge_current_limit(dev, gpio_charger); + if (ret < 0) + return ret; + if (gpio_charger->current_limit_map) { + gpio_charger_properties[num_props] = + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX; + num_props++; + } + charger_desc = &gpio_charger->charger_desc; charger_desc->properties = gpio_charger_properties; charger_desc->num_properties = num_props; charger_desc->get_property = gpio_charger_get_property; + charger_desc->set_property = gpio_charger_set_property; + charger_desc->property_is_writeable = + gpio_charger_property_is_writeable; psy_cfg.of_node = dev->of_node; psy_cfg.drv_data = gpio_charger; |