hwmon: (pmbus/ucd9000) Add support for UCD90320 Power Sequencer

Add support for the UCD90320 chip and its expanded set of GPIO pins.
Signed-off-by: Jim Wright <wrightj@linux.vnet.ibm.com>
Link: https://lore.kernel.org/r/20191205232411.21492-3-wrightj@linux.vnet.ibm.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/hwmon/ucd9000.rst

@@ -3,9 +3,10 @@ Kernel driver ucd9000
 
 Supported chips:
 
-  * TI UCD90120, UCD90124, UCD90160, UCD9090, and UCD90910
+  * TI UCD90120, UCD90124, UCD90160, UCD90320, UCD9090, and UCD90910
 
-    Prefixes: 'ucd90120', 'ucd90124', 'ucd90160', 'ucd9090', 'ucd90910'
+    Prefixes: 'ucd90120', 'ucd90124', 'ucd90160', 'ucd90320', 'ucd9090',
+              'ucd90910'
 
     Addresses scanned: -
 
@@ -14,6 +15,7 @@ Supported chips:
 	- http://focus.ti.com/lit/ds/symlink/ucd90120.pdf
 	- http://focus.ti.com/lit/ds/symlink/ucd90124.pdf
 	- http://focus.ti.com/lit/ds/symlink/ucd90160.pdf
+	- http://focus.ti.com/lit/ds/symlink/ucd90320.pdf
 	- http://focus.ti.com/lit/ds/symlink/ucd9090.pdf
 	- http://focus.ti.com/lit/ds/symlink/ucd90910.pdf
 
@@ -45,6 +47,12 @@ power-on reset signals, external interrupts, cascading, or other system
 functions. Twelve of these pins offer PWM functionality. Using these pins, the
 UCD90160 offers support for margining, and general-purpose PWM functions.
 
+The UCD90320 is a 32-rail PMBus/I2C addressable power-supply sequencer and
+monitor. The 24 integrated ADC channels (AMONx) monitor the power supply
+voltage, current, and temperature. Of the 84 GPIO pins, 8 can be used as
+digital monitors (DMONx), 32 to enable the power supply (ENx), 24 for margining
+(MARx), 16 for logical GPO, and 32 GPIs for cascading, and system function.
+
 The UCD9090 is a 10-rail PMBus/I2C addressable power-supply sequencer and
 monitor. The device integrates a 12-bit ADC for monitoring up to 10 power-supply
 voltage inputs. Twenty-three GPIO pins can be used for power supply enables,

drivers/hwmon/pmbus/Kconfig

@@ -209,11 +209,11 @@ config SENSORS_TPS53679
 	  be called tps53679.
 
 config SENSORS_UCD9000
-	tristate "TI UCD90120, UCD90124, UCD90160, UCD9090, UCD90910"
+	tristate "TI UCD90120, UCD90124, UCD90160, UCD90320, UCD9090, UCD90910"
 	help
 	  If you say yes here you get hardware monitoring support for TI
-	  UCD90120, UCD90124, UCD90160, UCD9090, UCD90910, Sequencer and System
-	  Health Controllers.
+	  UCD90120, UCD90124, UCD90160, UCD90320, UCD9090, UCD90910, Sequencer
+	  and System Health Controllers.
 
 	  This driver can also be built as a module. If so, the module will
 	  be called ucd9000.

drivers/hwmon/pmbus/ucd9000.c

@@ -18,7 +18,8 @@
 #include <linux/gpio/driver.h>
 #include "pmbus.h"
 
-enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };
+enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd90320, ucd9090,
+	     ucd90910 };
 
 #define UCD9000_MONITOR_CONFIG		0xd5
 #define UCD9000_NUM_PAGES		0xd6
@@ -38,7 +39,7 @@ enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };
 #define UCD9000_GPIO_OUTPUT		1
 
 #define UCD9000_MON_TYPE(x)	(((x) >> 5) & 0x07)
-#define UCD9000_MON_PAGE(x)	((x) & 0x0f)
+#define UCD9000_MON_PAGE(x)	((x) & 0x1f)
 
 #define UCD9000_MON_VOLTAGE	1
 #define UCD9000_MON_TEMPERATURE	2
@@ -50,10 +51,12 @@ enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };
 #define UCD9000_GPIO_NAME_LEN	16
 #define UCD9090_NUM_GPIOS	23
 #define UCD901XX_NUM_GPIOS	26
+#define UCD90320_NUM_GPIOS	84
 #define UCD90910_NUM_GPIOS	26
 
 #define UCD9000_DEBUGFS_NAME_LEN	24
 #define UCD9000_GPI_COUNT		8
+#define UCD90320_GPI_COUNT		32
 
 struct ucd9000_data {
 	u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
@@ -131,6 +134,7 @@ static const struct i2c_device_id ucd9000_id[] = {
 	{"ucd90120", ucd90120},
 	{"ucd90124", ucd90124},
 	{"ucd90160", ucd90160},
+	{"ucd90320", ucd90320},
 	{"ucd9090", ucd9090},
 	{"ucd90910", ucd90910},
 	{}
@@ -154,6 +158,10 @@ static const struct of_device_id __maybe_unused ucd9000_of_match[] = {
 		.compatible = "ti,ucd90160",
 		.data = (void *)ucd90160
 	},
+	{
+		.compatible = "ti,ucd90320",
+		.data = (void *)ucd90320
+	},
 	{
 		.compatible = "ti,ucd9090",
 		.data = (void *)ucd9090
@@ -322,6 +330,9 @@ static void ucd9000_probe_gpio(struct i2c_client *client,
 	case ucd90160:
 		data->gpio.ngpio = UCD901XX_NUM_GPIOS;
 		break;
+	case ucd90320:
+		data->gpio.ngpio = UCD90320_NUM_GPIOS;
+		break;
 	case ucd90910:
 		data->gpio.ngpio = UCD90910_NUM_GPIOS;
 		break;
@@ -372,17 +383,18 @@ static int ucd9000_debugfs_show_mfr_status_bit(void *data, u64 *val)
 	struct ucd9000_debugfs_entry *entry = data;
 	struct i2c_client *client = entry->client;
 	u8 buffer[I2C_SMBUS_BLOCK_MAX];
-	int ret;
+	int ret, i;
 
 	ret = ucd9000_get_mfr_status(client, buffer);
 	if (ret < 0)
 		return ret;
 
 	/*
-	 * Attribute only created for devices with gpi fault bits at bits
-	 * 16-23, which is the second byte of the response.
+	 * GPI fault bits are in sets of 8, two bytes from end of response.
 	 */
-	*val = !!(buffer[1] & BIT(entry->index));
+	i = ret - 3 - entry->index / 8;
+	if (i >= 0)
+		*val = !!(buffer[i] & BIT(entry->index % 8));
 
 	return 0;
 }
@@ -422,7 +434,7 @@ static int ucd9000_init_debugfs(struct i2c_client *client,
 {
 	struct dentry *debugfs;
 	struct ucd9000_debugfs_entry *entries;
-	int i;
+	int i, gpi_count;
 	char name[UCD9000_DEBUGFS_NAME_LEN];
 
 	debugfs = pmbus_get_debugfs_dir(client);
@@ -435,18 +447,21 @@ static int ucd9000_init_debugfs(struct i2c_client *client,
 
 	/*
 	 * Of the chips this driver supports, only the UCD9090, UCD90160,
-	 * and UCD90910 report GPI faults in their MFR_STATUS register, so only
-	 * create the GPI fault debugfs attributes for those chips.
+	 * UCD90320, and UCD90910 report GPI faults in their MFR_STATUS
+	 * register, so only create the GPI fault debugfs attributes for those
+	 * chips.
 	 */
 	if (mid->driver_data == ucd9090 || mid->driver_data == ucd90160 ||
-	    mid->driver_data == ucd90910) {
+	    mid->driver_data == ucd90320 || mid->driver_data == ucd90910) {
+		gpi_count = mid->driver_data == ucd90320 ? UCD90320_GPI_COUNT
+							 : UCD9000_GPI_COUNT;
 		entries = devm_kcalloc(&client->dev,
-				       UCD9000_GPI_COUNT, sizeof(*entries),
+				       gpi_count, sizeof(*entries),
 				       GFP_KERNEL);
 		if (!entries)
 			return -ENOMEM;
 
-		for (i = 0; i < UCD9000_GPI_COUNT; i++) {
+		for (i = 0; i < gpi_count; i++) {
 			entries[i].client = client;
 			entries[i].index = i;
 			scnprintf(name, UCD9000_DEBUGFS_NAME_LEN,