Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 473 insertions, 0 deletions

diff --git a/drivers/hwmon/pmbus/zl6100.c b/drivers/hwmon/pmbus/zl6100.c
new file mode 100644
index 000000000..e9df0c56d
--- /dev/null
+++ b/drivers/hwmon/pmbus/zl6100.c
@@ -0,0 +1,473 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Hardware monitoring driver for ZL6100 and compatibles
+ *
+ * Copyright (c) 2011 Ericsson AB.
+ * Copyright (c) 2012 Guenter Roeck
+ */
+
+#include <linux/bitops.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/ktime.h>
+#include <linux/delay.h>
+#include "pmbus.h"
+
+enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105,
+	     zl8802, zl9101, zl9117, zls1003, zls4009 };
+
+struct zl6100_data {
+	int id;
+	ktime_t access;		/* chip access time */
+	int delay;		/* Delay between chip accesses in uS */
+	struct pmbus_driver_info info;
+};
+
+#define to_zl6100_data(x)  container_of(x, struct zl6100_data, info)
+
+#define ZL6100_MFR_CONFIG		0xd0
+#define ZL6100_DEVICE_ID		0xe4
+
+#define ZL6100_MFR_XTEMP_ENABLE		BIT(7)
+
+#define ZL8802_MFR_USER_GLOBAL_CONFIG	0xe9
+#define ZL8802_MFR_TMON_ENABLE		BIT(12)
+#define ZL8802_MFR_USER_CONFIG		0xd1
+#define ZL8802_MFR_XTEMP_ENABLE_2	BIT(1)
+#define ZL8802_MFR_DDC_CONFIG		0xd3
+#define ZL8802_MFR_PHASES_MASK		0x0007
+
+#define MFR_VMON_OV_FAULT_LIMIT		0xf5
+#define MFR_VMON_UV_FAULT_LIMIT		0xf6
+#define MFR_READ_VMON			0xf7
+
+#define VMON_UV_WARNING			BIT(5)
+#define VMON_OV_WARNING			BIT(4)
+#define VMON_UV_FAULT			BIT(1)
+#define VMON_OV_FAULT			BIT(0)
+
+#define ZL6100_WAIT_TIME		1000	/* uS	*/
+
+static ushort delay = ZL6100_WAIT_TIME;
+module_param(delay, ushort, 0644);
+MODULE_PARM_DESC(delay, "Delay between chip accesses in uS");
+
+/* Convert linear sensor value to milli-units */
+static long zl6100_l2d(s16 l)
+{
+	s16 exponent;
+	s32 mantissa;
+	long val;
+
+	exponent = l >> 11;
+	mantissa = ((s16)((l & 0x7ff) << 5)) >> 5;
+
+	val = mantissa;
+
+	/* scale result to milli-units */
+	val = val * 1000L;
+
+	if (exponent >= 0)
+		val <<= exponent;
+	else
+		val >>= -exponent;
+
+	return val;
+}
+
+#define MAX_MANTISSA	(1023 * 1000)
+#define MIN_MANTISSA	(511 * 1000)
+
+static u16 zl6100_d2l(long val)
+{
+	s16 exponent = 0, mantissa;
+	bool negative = false;
+
+	/* simple case */
+	if (val == 0)
+		return 0;
+
+	if (val < 0) {
+		negative = true;
+		val = -val;
+	}
+
+	/* Reduce large mantissa until it fits into 10 bit */
+	while (val >= MAX_MANTISSA && exponent < 15) {
+		exponent++;
+		val >>= 1;
+	}
+	/* Increase small mantissa to improve precision */
+	while (val < MIN_MANTISSA && exponent > -15) {
+		exponent--;
+		val <<= 1;
+	}
+
+	/* Convert mantissa from milli-units to units */
+	mantissa = DIV_ROUND_CLOSEST(val, 1000);
+
+	/* Ensure that resulting number is within range */
+	if (mantissa > 0x3ff)
+		mantissa = 0x3ff;
+
+	/* restore sign */
+	if (negative)
+		mantissa = -mantissa;
+
+	/* Convert to 5 bit exponent, 11 bit mantissa */
+	return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
+}
+
+/* Some chips need a delay between accesses */
+static inline void zl6100_wait(const struct zl6100_data *data)
+{
+	if (data->delay) {
+		s64 delta = ktime_us_delta(ktime_get(), data->access);
+		if (delta < data->delay)
+			udelay(data->delay - delta);
+	}
+}
+
+static int zl6100_read_word_data(struct i2c_client *client, int page,
+				 int phase, int reg)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	struct zl6100_data *data = to_zl6100_data(info);
+	int ret, vreg;
+
+	if (page >= info->pages)
+		return -ENXIO;
+
+	if (data->id == zl2005) {
+		/*
+		 * Limit register detection is not reliable on ZL2005.
+		 * Make sure registers are not erroneously detected.
+		 */
+		switch (reg) {
+		case PMBUS_VOUT_OV_WARN_LIMIT:
+		case PMBUS_VOUT_UV_WARN_LIMIT:
+		case PMBUS_IOUT_OC_WARN_LIMIT:
+			return -ENXIO;
+		}
+	}
+
+	switch (reg) {
+	case PMBUS_VIRT_READ_VMON:
+		vreg = MFR_READ_VMON;
+		break;
+	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
+	case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
+		vreg = MFR_VMON_OV_FAULT_LIMIT;
+		break;
+	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
+	case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
+		vreg = MFR_VMON_UV_FAULT_LIMIT;
+		break;
+	default:
+		if (reg >= PMBUS_VIRT_BASE)
+			return -ENXIO;
+		vreg = reg;
+		break;
+	}
+
+	zl6100_wait(data);
+	ret = pmbus_read_word_data(client, page, phase, vreg);
+	data->access = ktime_get();
+	if (ret < 0)
+		return ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
+		ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 9, 10));
+		break;
+	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
+		ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 11, 10));
+		break;
+	}
+
+	return ret;
+}
+
+static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	struct zl6100_data *data = to_zl6100_data(info);
+	int ret, status;
+
+	if (page >= info->pages)
+		return -ENXIO;
+
+	zl6100_wait(data);
+
+	switch (reg) {
+	case PMBUS_VIRT_STATUS_VMON:
+		ret = pmbus_read_byte_data(client, 0,
+					   PMBUS_STATUS_MFR_SPECIFIC);
+		if (ret < 0)
+			break;
+
+		status = 0;
+		if (ret & VMON_UV_WARNING)
+			status |= PB_VOLTAGE_UV_WARNING;
+		if (ret & VMON_OV_WARNING)
+			status |= PB_VOLTAGE_OV_WARNING;
+		if (ret & VMON_UV_FAULT)
+			status |= PB_VOLTAGE_UV_FAULT;
+		if (ret & VMON_OV_FAULT)
+			status |= PB_VOLTAGE_OV_FAULT;
+		ret = status;
+		break;
+	default:
+		ret = pmbus_read_byte_data(client, page, reg);
+		break;
+	}
+	data->access = ktime_get();
+
+	return ret;
+}
+
+static int zl6100_write_word_data(struct i2c_client *client, int page, int reg,
+				  u16 word)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	struct zl6100_data *data = to_zl6100_data(info);
+	int ret, vreg;
+
+	if (page >= info->pages)
+		return -ENXIO;
+
+	switch (reg) {
+	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
+		word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 9));
+		vreg = MFR_VMON_OV_FAULT_LIMIT;
+		pmbus_clear_cache(client);
+		break;
+	case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
+		vreg = MFR_VMON_OV_FAULT_LIMIT;
+		pmbus_clear_cache(client);
+		break;
+	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
+		word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 11));
+		vreg = MFR_VMON_UV_FAULT_LIMIT;
+		pmbus_clear_cache(client);
+		break;
+	case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
+		vreg = MFR_VMON_UV_FAULT_LIMIT;
+		pmbus_clear_cache(client);
+		break;
+	default:
+		if (reg >= PMBUS_VIRT_BASE)
+			return -ENXIO;
+		vreg = reg;
+	}
+
+	zl6100_wait(data);
+	ret = pmbus_write_word_data(client, page, vreg, word);
+	data->access = ktime_get();
+
+	return ret;
+}
+
+static int zl6100_write_byte(struct i2c_client *client, int page, u8 value)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	struct zl6100_data *data = to_zl6100_data(info);
+	int ret;
+
+	if (page >= info->pages)
+		return -ENXIO;
+
+	zl6100_wait(data);
+	ret = pmbus_write_byte(client, page, value);
+	data->access = ktime_get();
+
+	return ret;
+}
+
+static const struct i2c_device_id zl6100_id[] = {
+	{"bmr450", zl2005},
+	{"bmr451", zl2005},
+	{"bmr462", zl2008},
+	{"bmr463", zl2008},
+	{"bmr464", zl2008},
+	{"bmr465", zls4009},
+	{"bmr466", zls1003},
+	{"bmr467", zls4009},
+	{"bmr469", zl8802},
+	{"zl2004", zl2004},
+	{"zl2005", zl2005},
+	{"zl2006", zl2006},
+	{"zl2008", zl2008},
+	{"zl2105", zl2105},
+	{"zl2106", zl2106},
+	{"zl6100", zl6100},
+	{"zl6105", zl6105},
+	{"zl8802", zl8802},
+	{"zl9101", zl9101},
+	{"zl9117", zl9117},
+	{"zls1003", zls1003},
+	{"zls4009", zls4009},
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, zl6100_id);
+
+static int zl6100_probe(struct i2c_client *client)
+{
+	int ret, i;
+	struct zl6100_data *data;
+	struct pmbus_driver_info *info;
+	u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
+	const struct i2c_device_id *mid;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_READ_WORD_DATA
+				     | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
+		return -ENODEV;
+
+	ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID,
+					device_id);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed to read device ID\n");
+		return ret;
+	}
+	device_id[ret] = '\0';
+	dev_info(&client->dev, "Device ID %s\n", device_id);
+
+	mid = NULL;
+	for (mid = zl6100_id; mid->name[0]; mid++) {
+		if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
+			break;
+	}
+	if (!mid->name[0]) {
+		dev_err(&client->dev, "Unsupported device\n");
+		return -ENODEV;
+	}
+	if (strcmp(client->name, mid->name) != 0)
+		dev_notice(&client->dev,
+			   "Device mismatch: Configured %s, detected %s\n",
+			   client->name, mid->name);
+
+	data = devm_kzalloc(&client->dev, sizeof(struct zl6100_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->id = mid->driver_data;
+
+	/*
+	 * According to information from the chip vendor, all currently
+	 * supported chips are known to require a wait time between I2C
+	 * accesses.
+	 */
+	data->delay = delay;
+
+	/*
+	 * Since there was a direct I2C device access above, wait before
+	 * accessing the chip again.
+	 */
+	data->access = ktime_get();
+	zl6100_wait(data);
+
+	info = &data->info;
+
+	info->pages = 1;
+	info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
+	  | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+	  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+	  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
+
+	/*
+	 * ZL2004, ZL8802, ZL9101M, ZL9117M and ZLS4009 support monitoring
+	 * an extra voltage (VMON for ZL2004, ZL8802 and ZLS4009,
+	 * VDRV for ZL9101M and ZL9117M). Report it as vmon.
+	 */
+	if (data->id == zl2004 || data->id == zl8802 || data->id == zl9101 ||
+	    data->id == zl9117 || data->id == zls4009)
+		info->func[0] |= PMBUS_HAVE_VMON | PMBUS_HAVE_STATUS_VMON;
+
+	/*
+	 * ZL8802 has two outputs that can be used either independently or in
+	 * a current sharing configuration. The driver uses the DDC_CONFIG
+	 * register to check if the module is running with independent or
+	 * shared outputs. If the module is in shared output mode, only one
+	 * output voltage will be reported.
+	 */
+	if (data->id == zl8802) {
+		info->pages = 2;
+		info->func[0] |= PMBUS_HAVE_IIN;
+
+		ret = i2c_smbus_read_word_data(client, ZL8802_MFR_DDC_CONFIG);
+		if (ret < 0)
+			return ret;
+
+		data->access = ktime_get();
+		zl6100_wait(data);
+
+		if (ret & ZL8802_MFR_PHASES_MASK)
+			info->func[1] |= PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
+		else
+			info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+				| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
+
+		for (i = 0; i < 2; i++) {
+			ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
+			if (ret < 0)
+				return ret;
+
+			data->access = ktime_get();
+			zl6100_wait(data);
+
+			ret = i2c_smbus_read_word_data(client, ZL8802_MFR_USER_CONFIG);
+			if (ret < 0)
+				return ret;
+
+			if (ret & ZL8802_MFR_XTEMP_ENABLE_2)
+				info->func[i] |= PMBUS_HAVE_TEMP2;
+
+			data->access = ktime_get();
+			zl6100_wait(data);
+		}
+		ret = i2c_smbus_read_word_data(client, ZL8802_MFR_USER_GLOBAL_CONFIG);
+		if (ret < 0)
+			return ret;
+
+		if (ret & ZL8802_MFR_TMON_ENABLE)
+			info->func[0] |= PMBUS_HAVE_TEMP3;
+	} else {
+		ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG);
+		if (ret < 0)
+			return ret;
+
+		if (ret & ZL6100_MFR_XTEMP_ENABLE)
+			info->func[0] |= PMBUS_HAVE_TEMP2;
+	}
+
+	data->access = ktime_get();
+	zl6100_wait(data);
+
+	info->read_word_data = zl6100_read_word_data;
+	info->read_byte_data = zl6100_read_byte_data;
+	info->write_word_data = zl6100_write_word_data;
+	info->write_byte = zl6100_write_byte;
+
+	return pmbus_do_probe(client, info);
+}
+
+static struct i2c_driver zl6100_driver = {
+	.driver = {
+		   .name = "zl6100",
+		   },
+	.probe_new = zl6100_probe,
+	.id_table = zl6100_id,
+};
+
+module_i2c_driver(zl6100_driver);
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);