[10/15] power: supply: bq24190_charger: Use extcon to determine ilimit, 5v boost

Message ID 20170317095527.10487-11-hdegoede@redhat.com
State Not Applicable
Headers show

Commit Message

Hans de Goede March 17, 2017, 9:55 a.m.
Add support for monitoring an extcon device with SDP/CDP/DCP and HOST
cables and adjust ilimit and enable/disable the 5v boost converter
accordingly. This is necessary on systems where the PSEL pin is hardwired
high and ILIM needs to be set by software based on the detected charger
type.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/power/supply/Kconfig           |  1 +
 drivers/power/supply/bq24190_charger.c | 85 ++++++++++++++++++++++++++++++++++
 include/linux/power/bq24190_charger.h  |  1 +
 3 files changed, 87 insertions(+)

Comments

Andy Shevchenko March 17, 2017, 5:33 p.m. | #1
On Fri, 2017-03-17 at 10:55 +0100, Hans de Goede wrote:
> Add support for monitoring an extcon device with SDP/CDP/DCP and HOST
> cables and adjust ilimit and enable/disable the 5v boost converter
> accordingly. This is necessary on systems where the PSEL pin is
> hardwired
> high and ILIM needs to be set by software based on the detected
> charger
> type.
> 

>  config CHARGER_BQ24190
>  	tristate "TI BQ24190 battery charger driver"
>  	depends on I2C

> +	depends on EXTCON

I dunno what is preferred here, but if we would like to keep
compatibility with previous configurations "select" should be used over
"depends on".

> +static void bq24190_extcon_work(struct work_struct *work)
> +{
> +	struct bq24190_dev_info *bdi =
> +		container_of(work, struct bq24190_dev_info,
> extcon_work);
> +	int ret, iinlim = 0;
> +
> +	if (extcon_get_state(bdi->extcon, EXTCON_CHG_USB_SDP) == 1)
> +		iinlim = 500000;
> +	else if (extcon_get_state(bdi->extcon, EXTCON_CHG_USB_CDP) ==
> 1 ||
> +		 extcon_get_state(bdi->extcon, EXTCON_CHG_USB_ACA) ==
> 1)
> +		iinlim = 1500000;
> +	else if (extcon_get_state(bdi->extcon, EXTCON_CHG_USB_DCP) ==
> 1)
> +		iinlim = 2000000;
> +

> +	if (iinlim) {

Could be possible to call below unconditionally here (use 0)?

> +		ret = bq24190_set_field_val(bdi, BQ24190_REG_ISC,
> +				BQ24190_REG_ISC_IINLIM_MASK,
> +				BQ24190_REG_ISC_IINLIM_SHIFT,
> +				bq24190_iinlim_values,
> +				ARRAY_SIZE(bq24190_iinlim_values),
> +				iinlim);
> +		if (ret)
> +			dev_err(bdi->dev, "Can't set IINLIM: %d\n",
> ret);
> +	}

Perhaps make above as a helper?

In that case no need for "if (iinlim)" and perhaps switch-case might be
used instead of if-else-if (latter is up to you).
Sebastian Reichel March 20, 2017, 4:52 a.m. | #2
Hi,

On Fri, Mar 17, 2017 at 10:55:22AM +0100, Hans de Goede wrote:
> Add support for monitoring an extcon device with SDP/CDP/DCP and HOST
> cables and adjust ilimit and enable/disable the 5v boost converter
> accordingly. This is necessary on systems where the PSEL pin is hardwired
> high and ILIM needs to be set by software based on the detected charger
> type.
> 
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Acked-By: Sebastian Reichel <sre@kernel.org>

-- Sebastian

> ---
>  drivers/power/supply/Kconfig           |  1 +
>  drivers/power/supply/bq24190_charger.c | 85 ++++++++++++++++++++++++++++++++++
>  include/linux/power/bq24190_charger.h  |  1 +
>  3 files changed, 87 insertions(+)
> 
> diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
> index f8b6e64..fd93110 100644
> --- a/drivers/power/supply/Kconfig
> +++ b/drivers/power/supply/Kconfig
> @@ -442,6 +442,7 @@ config CHARGER_BQ2415X
>  config CHARGER_BQ24190
>  	tristate "TI BQ24190 battery charger driver"
>  	depends on I2C
> +	depends on EXTCON
>  	depends on GPIOLIB || COMPILE_TEST
>  	help
>  	  Say Y to enable support for the TI BQ24190 battery charger.
> diff --git a/drivers/power/supply/bq24190_charger.c b/drivers/power/supply/bq24190_charger.c
> index 82cb33d..03990e2 100644
> --- a/drivers/power/supply/bq24190_charger.c
> +++ b/drivers/power/supply/bq24190_charger.c
> @@ -11,10 +11,12 @@
>  #include <linux/module.h>
>  #include <linux/interrupt.h>
>  #include <linux/delay.h>
> +#include <linux/extcon.h>
>  #include <linux/of_irq.h>
>  #include <linux/of_device.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/power_supply.h>
> +#include <linux/workqueue.h>
>  #include <linux/gpio.h>
>  #include <linux/i2c.h>
>  
> @@ -39,6 +41,8 @@
>  #define BQ24190_REG_POC_WDT_RESET_SHIFT		6
>  #define BQ24190_REG_POC_CHG_CONFIG_MASK		(BIT(5) | BIT(4))
>  #define BQ24190_REG_POC_CHG_CONFIG_SHIFT	4
> +#define BQ24190_REG_POC_CHG_CONFIG_CHARGE	1
> +#define BQ24190_REG_POC_CHG_CONFIG_OTG		2
>  #define BQ24190_REG_POC_SYS_MIN_MASK		(BIT(3) | BIT(2) | BIT(1))
>  #define BQ24190_REG_POC_SYS_MIN_SHIFT		1
>  #define BQ24190_REG_POC_BOOST_LIM_MASK		BIT(0)
> @@ -152,6 +156,9 @@ struct bq24190_dev_info {
>  	struct power_supply		*charger;
>  	struct power_supply		*battery;
>  	struct bq24190_platform_data	*pdata;
> +	struct extcon_dev		*extcon;
> +	struct notifier_block		extcon_nb;
> +	struct work_struct		extcon_work;
>  	char				model_name[I2C_NAME_SIZE];
>  	kernel_ulong_t			model;
>  	struct mutex			f_reg_lock;
> @@ -167,6 +174,11 @@ struct bq24190_dev_info {
>   * number at that index in the array is the real-world value that it
>   * represents.
>   */
> +
> +/* REG00[2:0] (IINLIM) in uAh */
> +static const int bq24190_iinlim_values[] = {
> +	100000, 150000, 500000, 900000, 1200000, 1500000, 2000000, 3000000 };
> +
>  /* REG02[7:2] (ICHG) in uAh */
>  static const int bq24190_ccc_ichg_values[] = {
>  	 512000,  576000,  640000,  704000,  768000,  832000,  896000,  960000,
> @@ -1290,6 +1302,61 @@ static irqreturn_t bq24190_irq_handler_thread(int irq, void *data)
>  	return IRQ_HANDLED;
>  }
>  
> +static void bq24190_extcon_work(struct work_struct *work)
> +{
> +	struct bq24190_dev_info *bdi =
> +		container_of(work, struct bq24190_dev_info, extcon_work);
> +	int ret, iinlim = 0;
> +
> +	if (extcon_get_state(bdi->extcon, EXTCON_CHG_USB_SDP) == 1)
> +		iinlim = 500000;
> +	else if (extcon_get_state(bdi->extcon, EXTCON_CHG_USB_CDP) == 1 ||
> +		 extcon_get_state(bdi->extcon, EXTCON_CHG_USB_ACA) == 1)
> +		iinlim = 1500000;
> +	else if (extcon_get_state(bdi->extcon, EXTCON_CHG_USB_DCP) == 1)
> +		iinlim = 2000000;
> +
> +	if (iinlim) {
> +		ret = bq24190_set_field_val(bdi, BQ24190_REG_ISC,
> +				BQ24190_REG_ISC_IINLIM_MASK,
> +				BQ24190_REG_ISC_IINLIM_SHIFT,
> +				bq24190_iinlim_values,
> +				ARRAY_SIZE(bq24190_iinlim_values),
> +				iinlim);
> +		if (ret)
> +			dev_err(bdi->dev, "Can't set IINLIM: %d\n", ret);
> +	}
> +
> +	/*
> +	 * If no charger has been detected and host mode is requested, activate
> +	 * the 5V boost converter, otherwise deactivate it.
> +	 */
> +	if (!iinlim && extcon_get_state(bdi->extcon, EXTCON_USB_HOST) == 1) {
> +		ret = bq24190_write_mask(bdi, BQ24190_REG_POC,
> +					 BQ24190_REG_POC_CHG_CONFIG_MASK,
> +					 BQ24190_REG_POC_CHG_CONFIG_SHIFT,
> +					 BQ24190_REG_POC_CHG_CONFIG_OTG);
> +	} else {
> +		ret = bq24190_write_mask(bdi, BQ24190_REG_POC,
> +					 BQ24190_REG_POC_CHG_CONFIG_MASK,
> +					 BQ24190_REG_POC_CHG_CONFIG_SHIFT,
> +					 BQ24190_REG_POC_CHG_CONFIG_CHARGE);
> +	}
> +	if (ret)
> +		dev_err(bdi->dev, "Can't set CHG_CONFIG: %d\n", ret);
> +}
> +
> +static int bq24190_extcon_event(struct notifier_block *nb, unsigned long event,
> +				void *param)
> +{
> +	struct bq24190_dev_info *bdi =
> +		container_of(nb, struct bq24190_dev_info, extcon_nb);
> +
> +	schedule_work(&bdi->extcon_work);
> +
> +	return NOTIFY_OK;
> +}
> +
>  static int bq24190_hw_init(struct bq24190_dev_info *bdi)
>  {
>  	u8 v;
> @@ -1375,6 +1442,12 @@ static int bq24190_probe(struct i2c_client *client,
>  			return -EPROBE_DEFER;
>  	}
>  
> +	if (bdi->pdata && bdi->pdata->extcon_name) {
> +		bdi->extcon = extcon_get_extcon_dev(bdi->pdata->extcon_name);
> +		if (!bdi->extcon)
> +			return -EPROBE_DEFER;
> +	}
> +
>  	pm_runtime_enable(dev);
>  	pm_runtime_resume(dev);
>  
> @@ -1423,6 +1496,18 @@ static int bq24190_probe(struct i2c_client *client,
>  		goto out4;
>  	}
>  
> +	if (bdi->extcon) {
> +		INIT_WORK(&bdi->extcon_work, bq24190_extcon_work);
> +		bdi->extcon_nb.notifier_call = bq24190_extcon_event;
> +		ret = devm_extcon_register_notifier(dev, bdi->extcon, -1,
> +						    &bdi->extcon_nb);
> +		if (ret)
> +			goto out4;
> +
> +		/* Sync initial cable state */
> +		schedule_work(&bdi->extcon_work);
> +	}
> +
>  	return 0;
>  
>  out4:
> diff --git a/include/linux/power/bq24190_charger.h b/include/linux/power/bq24190_charger.h
> index 02d248b..909c5b9 100644
> --- a/include/linux/power/bq24190_charger.h
> +++ b/include/linux/power/bq24190_charger.h
> @@ -13,6 +13,7 @@
>  
>  struct bq24190_platform_data {
>  	bool no_register_reset;
> +	const char *extcon_name;
>  	int (*get_ext_bat_property)(enum power_supply_property prop,
>  				    union power_supply_propval *val);
>  };
> -- 
> 2.9.3
>
Hans de Goede March 20, 2017, 10:38 p.m. | #3
Hi,

On 17-03-17 18:33, Andy Shevchenko wrote:
> On Fri, 2017-03-17 at 10:55 +0100, Hans de Goede wrote:
>> Add support for monitoring an extcon device with SDP/CDP/DCP and HOST
>> cables and adjust ilimit and enable/disable the 5v boost converter
>> accordingly. This is necessary on systems where the PSEL pin is
>> hardwired
>> high and ILIM needs to be set by software based on the detected
>> charger
>> type.
>>
>
>>  config CHARGER_BQ24190
>>  	tristate "TI BQ24190 battery charger driver"
>>  	depends on I2C
>
>> +	depends on EXTCON
>
> I dunno what is preferred here, but if we would like to keep
> compatibility with previous configurations "select" should be used over
> "depends on".

select really should only be used for hidden options,
using select in other scenarios leads to all sort of
problems (hard to debug Kconfig dependency loops).

>
>> +static void bq24190_extcon_work(struct work_struct *work)
>> +{
>> +	struct bq24190_dev_info *bdi =
>> +		container_of(work, struct bq24190_dev_info,
>> extcon_work);
>> +	int ret, iinlim = 0;
>> +
>> +	if (extcon_get_state(bdi->extcon, EXTCON_CHG_USB_SDP) == 1)
>> +		iinlim = 500000;
>> +	else if (extcon_get_state(bdi->extcon, EXTCON_CHG_USB_CDP) ==
>> 1 ||
>> +		 extcon_get_state(bdi->extcon, EXTCON_CHG_USB_ACA) ==
>> 1)
>> +		iinlim = 1500000;
>> +	else if (extcon_get_state(bdi->extcon, EXTCON_CHG_USB_DCP) ==
>> 1)
>> +		iinlim = 2000000;
>> +
>
>> +	if (iinlim) {
>
> Could be possible to call below unconditionally here (use 0)?

If there is no Vbus setting iinlim is not useful, the charger
will reset it to a default as soon as Vbus comes up and i2c
transactions are not free.

>
>> +		ret = bq24190_set_field_val(bdi, BQ24190_REG_ISC,
>> +				BQ24190_REG_ISC_IINLIM_MASK,
>> +				BQ24190_REG_ISC_IINLIM_SHIFT,
>> +				bq24190_iinlim_values,
>> +				ARRAY_SIZE(bq24190_iinlim_values),
>> +				iinlim);
>> +		if (ret)
>> +			dev_err(bdi->dev, "Can't set IINLIM: %d\n",
>> ret);
>> +	}
>
> Perhaps make above as a helper?
>
> In that case no need for "if (iinlim)" and perhaps switch-case might be
> used instead of if-else-if (latter is up to you).

I prefer to keep this as is.

Thanks & Regards,

Hans
--
To unsubscribe from this list: send the line "unsubscribe linux-i2c" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Patch

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index f8b6e64..fd93110 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -442,6 +442,7 @@  config CHARGER_BQ2415X
 config CHARGER_BQ24190
 	tristate "TI BQ24190 battery charger driver"
 	depends on I2C
+	depends on EXTCON
 	depends on GPIOLIB || COMPILE_TEST
 	help
 	  Say Y to enable support for the TI BQ24190 battery charger.
diff --git a/drivers/power/supply/bq24190_charger.c b/drivers/power/supply/bq24190_charger.c
index 82cb33d..03990e2 100644
--- a/drivers/power/supply/bq24190_charger.c
+++ b/drivers/power/supply/bq24190_charger.c
@@ -11,10 +11,12 @@ 
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/delay.h>
+#include <linux/extcon.h>
 #include <linux/of_irq.h>
 #include <linux/of_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/power_supply.h>
+#include <linux/workqueue.h>
 #include <linux/gpio.h>
 #include <linux/i2c.h>
 
@@ -39,6 +41,8 @@ 
 #define BQ24190_REG_POC_WDT_RESET_SHIFT		6
 #define BQ24190_REG_POC_CHG_CONFIG_MASK		(BIT(5) | BIT(4))
 #define BQ24190_REG_POC_CHG_CONFIG_SHIFT	4
+#define BQ24190_REG_POC_CHG_CONFIG_CHARGE	1
+#define BQ24190_REG_POC_CHG_CONFIG_OTG		2
 #define BQ24190_REG_POC_SYS_MIN_MASK		(BIT(3) | BIT(2) | BIT(1))
 #define BQ24190_REG_POC_SYS_MIN_SHIFT		1
 #define BQ24190_REG_POC_BOOST_LIM_MASK		BIT(0)
@@ -152,6 +156,9 @@  struct bq24190_dev_info {
 	struct power_supply		*charger;
 	struct power_supply		*battery;
 	struct bq24190_platform_data	*pdata;
+	struct extcon_dev		*extcon;
+	struct notifier_block		extcon_nb;
+	struct work_struct		extcon_work;
 	char				model_name[I2C_NAME_SIZE];
 	kernel_ulong_t			model;
 	struct mutex			f_reg_lock;
@@ -167,6 +174,11 @@  struct bq24190_dev_info {
  * number at that index in the array is the real-world value that it
  * represents.
  */
+
+/* REG00[2:0] (IINLIM) in uAh */
+static const int bq24190_iinlim_values[] = {
+	100000, 150000, 500000, 900000, 1200000, 1500000, 2000000, 3000000 };
+
 /* REG02[7:2] (ICHG) in uAh */
 static const int bq24190_ccc_ichg_values[] = {
 	 512000,  576000,  640000,  704000,  768000,  832000,  896000,  960000,
@@ -1290,6 +1302,61 @@  static irqreturn_t bq24190_irq_handler_thread(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+static void bq24190_extcon_work(struct work_struct *work)
+{
+	struct bq24190_dev_info *bdi =
+		container_of(work, struct bq24190_dev_info, extcon_work);
+	int ret, iinlim = 0;
+
+	if (extcon_get_state(bdi->extcon, EXTCON_CHG_USB_SDP) == 1)
+		iinlim = 500000;
+	else if (extcon_get_state(bdi->extcon, EXTCON_CHG_USB_CDP) == 1 ||
+		 extcon_get_state(bdi->extcon, EXTCON_CHG_USB_ACA) == 1)
+		iinlim = 1500000;
+	else if (extcon_get_state(bdi->extcon, EXTCON_CHG_USB_DCP) == 1)
+		iinlim = 2000000;
+
+	if (iinlim) {
+		ret = bq24190_set_field_val(bdi, BQ24190_REG_ISC,
+				BQ24190_REG_ISC_IINLIM_MASK,
+				BQ24190_REG_ISC_IINLIM_SHIFT,
+				bq24190_iinlim_values,
+				ARRAY_SIZE(bq24190_iinlim_values),
+				iinlim);
+		if (ret)
+			dev_err(bdi->dev, "Can't set IINLIM: %d\n", ret);
+	}
+
+	/*
+	 * If no charger has been detected and host mode is requested, activate
+	 * the 5V boost converter, otherwise deactivate it.
+	 */
+	if (!iinlim && extcon_get_state(bdi->extcon, EXTCON_USB_HOST) == 1) {
+		ret = bq24190_write_mask(bdi, BQ24190_REG_POC,
+					 BQ24190_REG_POC_CHG_CONFIG_MASK,
+					 BQ24190_REG_POC_CHG_CONFIG_SHIFT,
+					 BQ24190_REG_POC_CHG_CONFIG_OTG);
+	} else {
+		ret = bq24190_write_mask(bdi, BQ24190_REG_POC,
+					 BQ24190_REG_POC_CHG_CONFIG_MASK,
+					 BQ24190_REG_POC_CHG_CONFIG_SHIFT,
+					 BQ24190_REG_POC_CHG_CONFIG_CHARGE);
+	}
+	if (ret)
+		dev_err(bdi->dev, "Can't set CHG_CONFIG: %d\n", ret);
+}
+
+static int bq24190_extcon_event(struct notifier_block *nb, unsigned long event,
+				void *param)
+{
+	struct bq24190_dev_info *bdi =
+		container_of(nb, struct bq24190_dev_info, extcon_nb);
+
+	schedule_work(&bdi->extcon_work);
+
+	return NOTIFY_OK;
+}
+
 static int bq24190_hw_init(struct bq24190_dev_info *bdi)
 {
 	u8 v;
@@ -1375,6 +1442,12 @@  static int bq24190_probe(struct i2c_client *client,
 			return -EPROBE_DEFER;
 	}
 
+	if (bdi->pdata && bdi->pdata->extcon_name) {
+		bdi->extcon = extcon_get_extcon_dev(bdi->pdata->extcon_name);
+		if (!bdi->extcon)
+			return -EPROBE_DEFER;
+	}
+
 	pm_runtime_enable(dev);
 	pm_runtime_resume(dev);
 
@@ -1423,6 +1496,18 @@  static int bq24190_probe(struct i2c_client *client,
 		goto out4;
 	}
 
+	if (bdi->extcon) {
+		INIT_WORK(&bdi->extcon_work, bq24190_extcon_work);
+		bdi->extcon_nb.notifier_call = bq24190_extcon_event;
+		ret = devm_extcon_register_notifier(dev, bdi->extcon, -1,
+						    &bdi->extcon_nb);
+		if (ret)
+			goto out4;
+
+		/* Sync initial cable state */
+		schedule_work(&bdi->extcon_work);
+	}
+
 	return 0;
 
 out4:
diff --git a/include/linux/power/bq24190_charger.h b/include/linux/power/bq24190_charger.h
index 02d248b..909c5b9 100644
--- a/include/linux/power/bq24190_charger.h
+++ b/include/linux/power/bq24190_charger.h
@@ -13,6 +13,7 @@ 
 
 struct bq24190_platform_data {
 	bool no_register_reset;
+	const char *extcon_name;
 	int (*get_ext_bat_property)(enum power_supply_property prop,
 				    union power_supply_propval *val);
 };