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linux/drivers/hwmon/pmbus/ucd9000.c
Stephen Kitt dd43193976 hwmon (pmbus) use simple i2c probe function 
pmbus_do_probe doesn't use the id information provided in its second
argument, so this can be removed, which then allows using the
single-parameter i2c probe function ("probe_new") for probes.

This avoids scanning the identifier tables during probes.

Drivers which didn't use the id are converted as-is; drivers which did
are modified as follows:

* if the information in i2c_client is sufficient, that's used instead
  (client->name);
* configured v. probed comparisons are performed by comparing the
  configured name to the detected name, instead of the ids; this
  involves strcmp but is still cheaper than comparing all the device
  names when scanning the tables;
* anything else is handled by calling i2c_match_id() with the same
  level of error-handling (if any) as before.

Additionally, the mismatch message in the ltc2978 driver is adjusted
so that it no longer assumes that the driver_data is an index into
ltc2978_id.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Acked-by: Wolfram Sang <wsa@kernel.org>
Link: https://lore.kernel.org/r/20200808210004.30880-1-steve@sk2.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2020-09-23 09:42:39 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Hardware monitoring driver for UCD90xxx Sequencer and System Health
* Controller series
*
* Copyright (C) 2011 Ericsson AB.
*/
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/pmbus.h>
#include <linux/gpio/driver.h>
#include "pmbus.h"
enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd90320, ucd9090,
ucd90910 };
#define UCD9000_MONITOR_CONFIG 0xd5
#define UCD9000_NUM_PAGES 0xd6
#define UCD9000_FAN_CONFIG_INDEX 0xe7
#define UCD9000_FAN_CONFIG 0xe8
#define UCD9000_MFR_STATUS 0xf3
#define UCD9000_GPIO_SELECT 0xfa
#define UCD9000_GPIO_CONFIG 0xfb
#define UCD9000_DEVICE_ID 0xfd
/* GPIO CONFIG bits */
#define UCD9000_GPIO_CONFIG_ENABLE BIT(0)
#define UCD9000_GPIO_CONFIG_OUT_ENABLE BIT(1)
#define UCD9000_GPIO_CONFIG_OUT_VALUE BIT(2)
#define UCD9000_GPIO_CONFIG_STATUS BIT(3)
#define UCD9000_GPIO_INPUT 0
#define UCD9000_GPIO_OUTPUT 1
#define UCD9000_MON_TYPE(x) (((x) >> 5) & 0x07)
#define UCD9000_MON_PAGE(x) ((x) & 0x1f)
#define UCD9000_MON_VOLTAGE 1
#define UCD9000_MON_TEMPERATURE 2
#define UCD9000_MON_CURRENT 3
#define UCD9000_MON_VOLTAGE_HW 4
#define UCD9000_NUM_FAN 4
#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];
struct pmbus_driver_info info;
#ifdef CONFIG_GPIOLIB
struct gpio_chip gpio;
#endif
struct dentry *debugfs;
};
#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
struct ucd9000_debugfs_entry {
struct i2c_client *client;
u8 index;
};
static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
{
int fan_config = 0;
struct ucd9000_data *data
= to_ucd9000_data(pmbus_get_driver_info(client));
if (data->fan_data[fan][3] & 1)
fan_config |= PB_FAN_2_INSTALLED; /* Use lower bit position */
/* Pulses/revolution */
fan_config |= (data->fan_data[fan][3] & 0x06) >> 1;
return fan_config;
}
static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
{
int ret = 0;
int fan_config;
switch (reg) {
case PMBUS_FAN_CONFIG_12:
if (page > 0)
return -ENXIO;
ret = ucd9000_get_fan_config(client, 0);
if (ret < 0)
return ret;
fan_config = ret << 4;
ret = ucd9000_get_fan_config(client, 1);
if (ret < 0)
return ret;
fan_config |= ret;
ret = fan_config;
break;
case PMBUS_FAN_CONFIG_34:
if (page > 0)
return -ENXIO;
ret = ucd9000_get_fan_config(client, 2);
if (ret < 0)
return ret;
fan_config = ret << 4;
ret = ucd9000_get_fan_config(client, 3);
if (ret < 0)
return ret;
fan_config |= ret;
ret = fan_config;
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static const struct i2c_device_id ucd9000_id[] = {
{"ucd9000", ucd9000},
{"ucd90120", ucd90120},
{"ucd90124", ucd90124},
{"ucd90160", ucd90160},
{"ucd90320", ucd90320},
{"ucd9090", ucd9090},
{"ucd90910", ucd90910},
{}
};
MODULE_DEVICE_TABLE(i2c, ucd9000_id);
static const struct of_device_id __maybe_unused ucd9000_of_match[] = {
{
.compatible = "ti,ucd9000",
.data = (void *)ucd9000
},
{
.compatible = "ti,ucd90120",
.data = (void *)ucd90120
},
{
.compatible = "ti,ucd90124",
.data = (void *)ucd90124
},
{
.compatible = "ti,ucd90160",
.data = (void *)ucd90160
},
{
.compatible = "ti,ucd90320",
.data = (void *)ucd90320
},
{
.compatible = "ti,ucd9090",
.data = (void *)ucd9090
},
{
.compatible = "ti,ucd90910",
.data = (void *)ucd90910
},
{ },
};
MODULE_DEVICE_TABLE(of, ucd9000_of_match);
#ifdef CONFIG_GPIOLIB
static int ucd9000_gpio_read_config(struct i2c_client *client,
unsigned int offset)
{
int ret;
/* No page set required */
ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_SELECT, offset);
if (ret < 0)
return ret;
return i2c_smbus_read_byte_data(client, UCD9000_GPIO_CONFIG);
}
static int ucd9000_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
struct i2c_client *client = gpiochip_get_data(gc);
int ret;
ret = ucd9000_gpio_read_config(client, offset);
if (ret < 0)
return ret;
return !!(ret & UCD9000_GPIO_CONFIG_STATUS);
}
static void ucd9000_gpio_set(struct gpio_chip *gc, unsigned int offset,
int value)
{
struct i2c_client *client = gpiochip_get_data(gc);
int ret;
ret = ucd9000_gpio_read_config(client, offset);
if (ret < 0) {
dev_dbg(&client->dev, "failed to read GPIO %d config: %d\n",
offset, ret);
return;
}
if (value) {
if (ret & UCD9000_GPIO_CONFIG_STATUS)
return;
ret |= UCD9000_GPIO_CONFIG_STATUS;
} else {
if (!(ret & UCD9000_GPIO_CONFIG_STATUS))
return;
ret &= ~UCD9000_GPIO_CONFIG_STATUS;
}
ret |= UCD9000_GPIO_CONFIG_ENABLE;
/* Page set not required */
ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
if (ret < 0) {
dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
offset, ret);
return;
}
ret &= ~UCD9000_GPIO_CONFIG_ENABLE;
ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
if (ret < 0)
dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
offset, ret);
}
static int ucd9000_gpio_get_direction(struct gpio_chip *gc,
unsigned int offset)
{
struct i2c_client *client = gpiochip_get_data(gc);
int ret;
ret = ucd9000_gpio_read_config(client, offset);
if (ret < 0)
return ret;
return !(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE);
}
static int ucd9000_gpio_set_direction(struct gpio_chip *gc,
unsigned int offset, bool direction_out,
int requested_out)
{
struct i2c_client *client = gpiochip_get_data(gc);
int ret, config, out_val;
ret = ucd9000_gpio_read_config(client, offset);
if (ret < 0)
return ret;
if (direction_out) {
out_val = requested_out ? UCD9000_GPIO_CONFIG_OUT_VALUE : 0;
if (ret & UCD9000_GPIO_CONFIG_OUT_ENABLE) {
if ((ret & UCD9000_GPIO_CONFIG_OUT_VALUE) == out_val)
return 0;
} else {
ret |= UCD9000_GPIO_CONFIG_OUT_ENABLE;
}
if (out_val)
ret |= UCD9000_GPIO_CONFIG_OUT_VALUE;
else
ret &= ~UCD9000_GPIO_CONFIG_OUT_VALUE;
} else {
if (!(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE))
return 0;
ret &= ~UCD9000_GPIO_CONFIG_OUT_ENABLE;
}
ret |= UCD9000_GPIO_CONFIG_ENABLE;
config = ret;
/* Page set not required */
ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
if (ret < 0)
return ret;
config &= ~UCD9000_GPIO_CONFIG_ENABLE;
return i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
}
static int ucd9000_gpio_direction_input(struct gpio_chip *gc,
unsigned int offset)
{
return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_INPUT, 0);
}
static int ucd9000_gpio_direction_output(struct gpio_chip *gc,
unsigned int offset, int val)
{
return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_OUTPUT,
val);
}
static void ucd9000_probe_gpio(struct i2c_client *client,
const struct i2c_device_id *mid,
struct ucd9000_data *data)
{
int rc;
switch (mid->driver_data) {
case ucd9090:
data->gpio.ngpio = UCD9090_NUM_GPIOS;
break;
case ucd90120:
case ucd90124:
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;
default:
return; /* GPIO support is optional. */
}
/*
* Pinmux support has not been added to the new gpio_chip.
* This support should be added when possible given the mux
* behavior of these IO devices.
*/
data->gpio.label = client->name;
data->gpio.get_direction = ucd9000_gpio_get_direction;
data->gpio.direction_input = ucd9000_gpio_direction_input;
data->gpio.direction_output = ucd9000_gpio_direction_output;
data->gpio.get = ucd9000_gpio_get;
data->gpio.set = ucd9000_gpio_set;
data->gpio.can_sleep = true;
data->gpio.base = -1;
data->gpio.parent = &client->dev;
rc = devm_gpiochip_add_data(&client->dev, &data->gpio, client);
if (rc)
dev_warn(&client->dev, "Could not add gpiochip: %d\n", rc);
}
#else
static void ucd9000_probe_gpio(struct i2c_client *client,
const struct i2c_device_id *mid,
struct ucd9000_data *data)
{
}
#endif /* CONFIG_GPIOLIB */
#ifdef CONFIG_DEBUG_FS
static int ucd9000_get_mfr_status(struct i2c_client *client, u8 *buffer)
{
int ret = pmbus_set_page(client, 0, 0xff);
if (ret < 0)
return ret;
return i2c_smbus_read_block_data(client, UCD9000_MFR_STATUS, buffer);
}
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, i;
ret = ucd9000_get_mfr_status(client, buffer);
if (ret < 0)
return ret;
/*
* GPI fault bits are in sets of 8, two bytes from end of response.
*/
i = ret - 3 - entry->index / 8;
if (i >= 0)
*val = !!(buffer[i] & BIT(entry->index % 8));
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_mfr_status_bit,
ucd9000_debugfs_show_mfr_status_bit, NULL, "%1lld\n");
static ssize_t ucd9000_debugfs_read_mfr_status(struct file *file,
char __user *buf, size_t count,
loff_t *ppos)
{
struct i2c_client *client = file->private_data;
u8 buffer[I2C_SMBUS_BLOCK_MAX];
char str[(I2C_SMBUS_BLOCK_MAX * 2) + 2];
char *res;
int rc;
rc = ucd9000_get_mfr_status(client, buffer);
if (rc < 0)
return rc;
res = bin2hex(str, buffer, min(rc, I2C_SMBUS_BLOCK_MAX));
*res++ = '\n';
*res = 0;
return simple_read_from_buffer(buf, count, ppos, str, res - str);
}
static const struct file_operations ucd9000_debugfs_show_mfr_status_fops = {
.llseek = noop_llseek,
.read = ucd9000_debugfs_read_mfr_status,
.open = simple_open,
};
static int ucd9000_init_debugfs(struct i2c_client *client,
const struct i2c_device_id *mid,
struct ucd9000_data *data)
{
struct dentry *debugfs;
struct ucd9000_debugfs_entry *entries;
int i, gpi_count;
char name[UCD9000_DEBUGFS_NAME_LEN];
debugfs = pmbus_get_debugfs_dir(client);
if (!debugfs)
return -ENOENT;
data->debugfs = debugfs_create_dir(client->name, debugfs);
if (!data->debugfs)
return -ENOENT;
/*
* Of the chips this driver supports, only the UCD9090, UCD90160,
* 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 == ucd90320 || mid->driver_data == ucd90910) {
gpi_count = mid->driver_data == ucd90320 ? UCD90320_GPI_COUNT
: UCD9000_GPI_COUNT;
entries = devm_kcalloc(&client->dev,
gpi_count, sizeof(*entries),
GFP_KERNEL);
if (!entries)
return -ENOMEM;
for (i = 0; i < gpi_count; i++) {
entries[i].client = client;
entries[i].index = i;
scnprintf(name, UCD9000_DEBUGFS_NAME_LEN,
"gpi%d_alarm", i + 1);
debugfs_create_file(name, 0444, data->debugfs,
&entries[i],
&ucd9000_debugfs_mfr_status_bit);
}
}
scnprintf(name, UCD9000_DEBUGFS_NAME_LEN, "mfr_status");
debugfs_create_file(name, 0444, data->debugfs, client,
&ucd9000_debugfs_show_mfr_status_fops);
return 0;
}
#else
static int ucd9000_init_debugfs(struct i2c_client *client,
const struct i2c_device_id *mid,
struct ucd9000_data *data)
{
return 0;
}
#endif /* CONFIG_DEBUG_FS */
static int ucd9000_probe(struct i2c_client *client)
{
u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
struct ucd9000_data *data;
struct pmbus_driver_info *info;
const struct i2c_device_id *mid;
enum chips chip;
int i, ret;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_BLOCK_DATA))
return -ENODEV;
ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
block_buffer);
if (ret < 0) {
dev_err(&client->dev, "Failed to read device ID\n");
return ret;
}
block_buffer[ret] = '\0';
dev_info(&client->dev, "Device ID %s\n", block_buffer);
for (mid = ucd9000_id; mid->name[0]; mid++) {
if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
break;
}
if (!mid->name[0]) {
dev_err(&client->dev, "Unsupported device\n");
return -ENODEV;
}
if (client->dev.of_node)
chip = (enum chips)of_device_get_match_data(&client->dev);
else
chip = mid->driver_data;
if (chip != ucd9000 && 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 ucd9000_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
info = &data->info;
ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
if (ret < 0) {
dev_err(&client->dev,
"Failed to read number of active pages\n");
return ret;
}
info->pages = ret;
if (!info->pages) {
dev_err(&client->dev, "No pages configured\n");
return -ENODEV;
}
/* The internal temperature sensor is always active */
info->func[0] = PMBUS_HAVE_TEMP;
/* Everything else is configurable */
ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
block_buffer);
if (ret <= 0) {
dev_err(&client->dev, "Failed to read configuration data\n");
return -ENODEV;
}
for (i = 0; i < ret; i++) {
int page = UCD9000_MON_PAGE(block_buffer[i]);
if (page >= info->pages)
continue;
switch (UCD9000_MON_TYPE(block_buffer[i])) {
case UCD9000_MON_VOLTAGE:
case UCD9000_MON_VOLTAGE_HW:
info->func[page] |= PMBUS_HAVE_VOUT
| PMBUS_HAVE_STATUS_VOUT;
break;
case UCD9000_MON_TEMPERATURE:
info->func[page] |= PMBUS_HAVE_TEMP2
| PMBUS_HAVE_STATUS_TEMP;
break;
case UCD9000_MON_CURRENT:
info->func[page] |= PMBUS_HAVE_IOUT
| PMBUS_HAVE_STATUS_IOUT;
break;
default:
break;
}
}
/* Fan configuration */
if (mid->driver_data == ucd90124) {
for (i = 0; i < UCD9000_NUM_FAN; i++) {
i2c_smbus_write_byte_data(client,
UCD9000_FAN_CONFIG_INDEX, i);
ret = i2c_smbus_read_block_data(client,
UCD9000_FAN_CONFIG,
data->fan_data[i]);
if (ret < 0)
return ret;
}
i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);
info->read_byte_data = ucd9000_read_byte_data;
info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
| PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
}
ucd9000_probe_gpio(client, mid, data);
ret = pmbus_do_probe(client, info);
if (ret)
return ret;
ret = ucd9000_init_debugfs(client, mid, data);
if (ret)
dev_warn(&client->dev, "Failed to register debugfs: %d\n",
ret);
return 0;
}
/* This is the driver that will be inserted */
static struct i2c_driver ucd9000_driver = {
.driver = {
.name = "ucd9000",
.of_match_table = of_match_ptr(ucd9000_of_match),
},
.probe_new = ucd9000_probe,
.remove = pmbus_do_remove,
.id_table = ucd9000_id,
};
module_i2c_driver(ucd9000_driver);
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
MODULE_LICENSE("GPL");
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