diff options
Diffstat (limited to 'drivers/hwmon/pmbus/ucd9000.c')
| -rw-r--r-- | drivers/hwmon/pmbus/ucd9000.c | 447 |
1 files changed, 424 insertions, 23 deletions
diff --git a/drivers/hwmon/pmbus/ucd9000.c b/drivers/hwmon/pmbus/ucd9000.c index fbb1479d3ad4..55e7af3a5f98 100644 --- a/drivers/hwmon/pmbus/ucd9000.c +++ b/drivers/hwmon/pmbus/ucd9000.c @@ -1,43 +1,47 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * Hardware monitoring driver for UCD90xxx Sequencer and System Health * Controller series * * Copyright (C) 2011 Ericsson AB. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ +#include <linux/debugfs.h> +#include <linux/delay.h> #include <linux/kernel.h> #include <linux/module.h> +#include <linux/of.h> #include <linux/init.h> #include <linux/err.h> #include <linux/slab.h> #include <linux/i2c.h> -#include <linux/i2c/pmbus.h> +#include <linux/pmbus.h> +#include <linux/gpio/driver.h> +#include <linux/timekeeping.h> #include "pmbus.h" -enum chips { ucd9000, ucd90120, ucd90124, ucd9090, ucd90910 }; +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) & 0x0f) +#define UCD9000_MON_PAGE(x) ((x) & 0x1f) #define UCD9000_MON_VOLTAGE 1 #define UCD9000_MON_TEMPERATURE 2 @@ -46,12 +50,41 @@ enum chips { ucd9000, ucd90120, ucd90124, ucd9090, ucd90910 }; #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; +}; + +/* + * It has been observed that the UCD90320 randomly fails register access when + * doing another access right on the back of a register write. To mitigate this + * make sure that there is a minimum delay between a write access and the + * following access. The 500 is based on experimental data. At a delay of + * 350us the issue seems to go away. Add a bit of extra margin to allow for + * system to system differences. + */ +#define UCD90320_WAIT_DELAY_US 500 + static int ucd9000_get_fan_config(struct i2c_client *client, int fan) { int fan_config = 0; @@ -112,19 +145,367 @@ 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 int ucd9000_probe(struct i2c_client *client, - const struct i2c_device_id *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 int 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 ret; + } + + if (value) { + if (ret & UCD9000_GPIO_CONFIG_OUT_VALUE) + return 0; + + ret |= UCD9000_GPIO_CONFIG_OUT_VALUE; + } else { + if (!(ret & UCD9000_GPIO_CONFIG_OUT_VALUE)) + return 0; + + ret &= ~UCD9000_GPIO_CONFIG_OUT_VALUE; + } + + 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; + } + + 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); + + return 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); + + /* + * 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, @@ -150,10 +531,15 @@ static int ucd9000_probe(struct i2c_client *client, return -ENODEV; } - if (id->driver_data != ucd9000 && id->driver_data != mid->driver_data) + if (client->dev.of_node) + chip = (uintptr_t)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", - id->name, mid->name); + client->name, mid->name); data = devm_kzalloc(&client->dev, sizeof(struct ucd9000_data), GFP_KERNEL); @@ -224,18 +610,32 @@ static int ucd9000_probe(struct i2c_client *client, 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; + } else if (mid->driver_data == ucd90320) { + /* Delay SMBus operations after a write */ + info->write_delay = UCD90320_WAIT_DELAY_US; } - return pmbus_do_probe(client, mid, info); + 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 = ucd9000_probe, - .remove = pmbus_do_remove, .id_table = ucd9000_id, }; @@ -244,3 +644,4 @@ module_i2c_driver(ucd9000_driver); MODULE_AUTHOR("Guenter Roeck"); MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx"); MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("PMBUS"); |