Commit 2a26f341 authored by Javier Achirica's avatar Javier Achirica Committed by Matthew Garrett
Browse files

sony-laptop: add usb charge function 



Allows to specify if the USB socket should charge attached devices while
the laptop is suspended to ram.

Signed-off-by: default avatarJavier Achirica <jachirica@gmail.com>
Signed-off-by: default avatarMattia Dongili <malattia@linux.it>
Signed-off-by: default avatarMatthew Garrett <matthew.garrett@nebula.com>
parent 9e04c908

drivers/platform/x86/sony-laptop.c

+86 −0
Original line number Diff line number Diff line
@@ -164,6 +164,9 @@ static int __sony_nc_gfx_switch_status_get(void); 
static int sony_nc_highspeed_charging_setup(struct platform_device *pd);

static void sony_nc_highspeed_charging_cleanup(struct platform_device *pd);



static int sony_nc_usb_charge_setup(struct platform_device *pd);

static void sony_nc_usb_charge_cleanup(struct platform_device *pd);



static int sony_nc_panelid_setup(struct platform_device *pd);

static void sony_nc_panelid_cleanup(struct platform_device *pd);
@@ -1388,6 +1391,12 @@ static void sony_nc_function_setup(struct acpi_device *device, 
				pr_err("couldn't set up keyboard backlight function (%d)\n",

						result);

			break;

		case 0x0155:

			result = sony_nc_usb_charge_setup(pf_device);

			if (result)

				pr_err("couldn't set up USB charge support (%d)\n",

						result);

			break;

		case 0x011D:

			result = sony_nc_panelid_setup(pf_device);

			if (result)
@@ -1458,6 +1467,9 @@ static void sony_nc_function_cleanup(struct platform_device *pd) 
		case 0x0163:

			sony_nc_kbd_backlight_cleanup(pd, handle);

			break;

		case 0x0155:

			sony_nc_usb_charge_cleanup(pd);

			break;

		case 0x011D:

			sony_nc_panelid_cleanup(pd);

			break;
@@ -2552,6 +2564,80 @@ static void sony_nc_highspeed_charging_cleanup(struct platform_device *pd) 
	}

}



/* USB charge function */

static struct device_attribute *uc_handle;



static ssize_t sony_nc_usb_charge_store(struct device *dev,

		struct device_attribute *attr,

		const char *buffer, size_t count)

{

	unsigned int result;

	unsigned long value;



	if (count > 31)

		return -EINVAL;



	if (kstrtoul(buffer, 10, &value) || value > 1)

		return -EINVAL;



	if (sony_call_snc_handle(0x0155, value << 0x10 | 0x0100, &result))

		return -EIO;



	return count;

}



static ssize_t sony_nc_usb_charge_show(struct device *dev,

		struct device_attribute *attr, char *buffer)

{

	unsigned int result;



	if (sony_call_snc_handle(0x0155, 0x0000, &result))

		return -EIO;



	return snprintf(buffer, PAGE_SIZE, "%d\n", result & 0x01);

}



static int sony_nc_usb_charge_setup(struct platform_device *pd)

{

	unsigned int result;



	if (sony_call_snc_handle(0x0155, 0x0000, &result) || !(result & 0x01)) {

		/* some models advertise the handle but have no implementation

		 * for it

		 */

		pr_info("No USB Charge capability found\n");

		return 0;

	}



	uc_handle = kzalloc(sizeof(struct device_attribute), GFP_KERNEL);

	if (!uc_handle)

		return -ENOMEM;



	sysfs_attr_init(&uc_handle->attr);

	uc_handle->attr.name = "usb_charge";

	uc_handle->attr.mode = S_IRUGO | S_IWUSR;

	uc_handle->show = sony_nc_usb_charge_show;

	uc_handle->store = sony_nc_usb_charge_store;



	result = device_create_file(&pd->dev, uc_handle);

	if (result) {

		kfree(uc_handle);

		uc_handle = NULL;

		return result;

	}



	return 0;

}



static void sony_nc_usb_charge_cleanup(struct platform_device *pd)

{

	if (uc_handle) {

		device_remove_file(&pd->dev, uc_handle);

		kfree(uc_handle);

		uc_handle = NULL;

	}

}



/* Panel ID function */

static struct device_attribute *panel_handle;

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