Commit c7ba788d authored by Oleg Dzhimiev's avatar Oleg Dzhimiev
Browse files

more comments

parent a31b83fc

src/drivers/elphel/elphel393-pwr.c

+38 −18
Original line number Original line Diff line number Diff line
@@ -38,9 +38,10 @@ 
#define SYSFS_READONLY            0444

#define SYSFS_READONLY            0444

#define SYSFS_WRITEONLY           0222

#define SYSFS_WRITEONLY           0222







/* PCA6408As */

#define GPIO_CHIP1_ADDR    0x20

#define GPIO_CHIP1_ADDR    0x20

#define GPIO_CHIP2_ADDR    0x21

#define GPIO_CHIP2_ADDR    0x21

/* PCA9571 on 10389, high 4 pins are NC */

#define GPIO_10389_U4_ADDR 0x25

#define GPIO_10389_U4_ADDR 0x25

#define LTC3589_ADDR       0x34

#define LTC3589_ADDR       0x34
@@ -315,7 +316,21 @@ static DEVICE_ATTR(channels_dis, SYSFS_PERMISSIONS, channels 
static DEVICE_ATTR(power_good,   SYSFS_PERMISSIONS & SYSFS_READONLY,    pgood_show,          NULL);

static DEVICE_ATTR(power_good,   SYSFS_PERMISSIONS & SYSFS_READONLY,    pgood_show,          NULL);

static DEVICE_ATTR(power_bad,    SYSFS_PERMISSIONS & SYSFS_READONLY,    pbad_show,           NULL);

static DEVICE_ATTR(power_bad,    SYSFS_PERMISSIONS & SYSFS_READONLY,    pbad_show,           NULL);

static DEVICE_ATTR(enable_por,   SYSFS_PERMISSIONS,                     enable_por_show,     enable_por_store);

static DEVICE_ATTR(enable_por,   SYSFS_PERMISSIONS,                     enable_por_show,     enable_por_store);

/*

 * Performs power off whtough CHIP2 P0

 * examples:

 *  1. echo "anything" > power_off - immediate shutdown

 *  2. shutdown -hP now - civilized shutdown

 */

static DEVICE_ATTR(power_off,    SYSFS_PERMISSIONS                 ,    NULL,                gpio_poweroff);

static DEVICE_ATTR(power_off,    SYSFS_PERMISSIONS                 ,    NULL,                gpio_poweroff);

/*

 * input is hex, set all outputs at once with a mask, 8xMSB - enable mask, 8xLSB - pin values.

 * examples:

 *  1. echo 0x101 > gpio_10389 - set P0 high, P1-P3 keep

 *  2. echo 0xf01 > gpio_10389 - set P0 high, P1-P3 - low

 *  3. echo 0x605 > gpio_10389 - P0 keep, P1 low, P2 high, P3 keep

 *  P7-P4 - NC, 0xX0X0 - not supported even on this driver level.

 */

static DEVICE_ATTR(gpio_10389,   SYSFS_PERMISSIONS,                     gpio_10389_get,      gpio_10389_set);

static DEVICE_ATTR(gpio_10389,   SYSFS_PERMISSIONS,                     gpio_10389_get,      gpio_10389_set);





static struct attribute *root_dev_attrs[] = {

static struct attribute *root_dev_attrs[] = {
@@ -593,23 +608,6 @@ static ssize_t enable_por_store(struct device *dev, struct device_attribute *att 
	return count;

	return count;

}

}





int gpio_10389_ctrl(struct device *dev, int value){

	int i, res;

	int val = 0;

	//lock here

	for(i=16;i<20;i++){

		if ((value>>(i-8))&0x1){

			val = (value>>(i-16))&0x1;

			res = gpio_conf_by_index(dev, i, 1, ~val);

			if (res<0) return res;

			res = gpio_conf_by_index(dev, i, 1, val);

			if (res<0) return res;

		}

	}

	//unlock somewhere here

	return 0;

}



static ssize_t gpio_10389_set(struct device *dev, struct device_attribute *attr, char *buf, size_t count)

static ssize_t gpio_10389_set(struct device *dev, struct device_attribute *attr, char *buf, size_t count)

{

{

	int result;

	int result;
@@ -620,6 +618,7 @@ static ssize_t gpio_10389_set(struct device *dev, struct device_attribute *attr, 
	return count;

	return count;

}

}





/* hardcoded to be [19:16] in pwr_gpio */

static ssize_t gpio_10389_get(struct device *dev, struct device_attribute *attr, char *buf)

static ssize_t gpio_10389_get(struct device *dev, struct device_attribute *attr, char *buf)

{

{

	int i;

	int i;
@@ -641,6 +640,23 @@ static ssize_t gpio_poweroff(struct device *dev, struct device_attribute *attr, 
	return count;

	return count;

}

}





int gpio_10389_ctrl(struct device *dev, int value){

	int i, res;

	int val = 0;

	//lock here

	for(i=16;i<20;i++){

		if ((value>>(i-8))&0x1){

			val = (value>>(i-16))&0x1;

			res = gpio_conf_by_index(dev, i, 1, ~val);

			if (res<0) return res;

			res = gpio_conf_by_index(dev, i, 1, val);

			if (res<0) return res;

		}

	}

	//unlock somewhere here

	return 0;

}



int gpio_shutdown(struct device *dev)

int gpio_shutdown(struct device *dev)

{

{

	int gpio_shutdown_index=get_gpio_index_by_name("NSHUTDOWN");

	int gpio_shutdown_index=get_gpio_index_by_name("NSHUTDOWN");
@@ -1233,6 +1249,10 @@ static int elphel393_pwr_probe(struct platform_device *pdev) 
	dev_dbg(&pdev->dev,"LTC3589 status= 0x%02x\n",ltc3589_read_field(ltc3589_client, LTC3589_AWE_PGSTAT));

	dev_dbg(&pdev->dev,"LTC3589 status= 0x%02x\n",ltc3589_read_field(ltc3589_client, LTC3589_AWE_PGSTAT));

	elphel393_pwr_init_of(pdev);

	elphel393_pwr_init_of(pdev);

	

	

	/*

	 * 1. pm_power_off - arch/arm/kernel/process.c - called in the end of halt if power off requested

	 * 2. To perform a proper system shutdown with power off ("shutdown -hP now") this function is set here.

	 */

	pm_power_off = shutdown;

	pm_power_off = shutdown;





	return 0;

	return 0;