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![Bartosz Golaszewski](/assets/img/avatar_default.png)
The only action currently performed in pmbus_do_remove() is removing the debugfs hierarchy. We can schedule a devm action at probe time and remove pmbus_do_remove() entirely from all pmbus drivers. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Link: https://lore.kernel.org/r/20201026105352.20359-1-brgl@bgdev.pl [groeck: Removed references to pmbus_do_remove from documentation] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
631 lines
15 KiB
C
631 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hardware monitoring driver for UCD90xxx Sequencer and System Health
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* Controller series
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*
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* Copyright (C) 2011 Ericsson AB.
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*/
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#include <linux/debugfs.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/pmbus.h>
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#include <linux/gpio/driver.h>
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#include "pmbus.h"
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enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd90320, ucd9090,
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ucd90910 };
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#define UCD9000_MONITOR_CONFIG 0xd5
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#define UCD9000_NUM_PAGES 0xd6
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#define UCD9000_FAN_CONFIG_INDEX 0xe7
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#define UCD9000_FAN_CONFIG 0xe8
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#define UCD9000_MFR_STATUS 0xf3
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#define UCD9000_GPIO_SELECT 0xfa
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#define UCD9000_GPIO_CONFIG 0xfb
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#define UCD9000_DEVICE_ID 0xfd
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/* GPIO CONFIG bits */
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#define UCD9000_GPIO_CONFIG_ENABLE BIT(0)
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#define UCD9000_GPIO_CONFIG_OUT_ENABLE BIT(1)
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#define UCD9000_GPIO_CONFIG_OUT_VALUE BIT(2)
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#define UCD9000_GPIO_CONFIG_STATUS BIT(3)
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#define UCD9000_GPIO_INPUT 0
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#define UCD9000_GPIO_OUTPUT 1
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#define UCD9000_MON_TYPE(x) (((x) >> 5) & 0x07)
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#define UCD9000_MON_PAGE(x) ((x) & 0x1f)
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#define UCD9000_MON_VOLTAGE 1
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#define UCD9000_MON_TEMPERATURE 2
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#define UCD9000_MON_CURRENT 3
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#define UCD9000_MON_VOLTAGE_HW 4
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#define UCD9000_NUM_FAN 4
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#define UCD9000_GPIO_NAME_LEN 16
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#define UCD9090_NUM_GPIOS 23
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#define UCD901XX_NUM_GPIOS 26
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#define UCD90320_NUM_GPIOS 84
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#define UCD90910_NUM_GPIOS 26
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#define UCD9000_DEBUGFS_NAME_LEN 24
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#define UCD9000_GPI_COUNT 8
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#define UCD90320_GPI_COUNT 32
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struct ucd9000_data {
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u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
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struct pmbus_driver_info info;
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#ifdef CONFIG_GPIOLIB
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struct gpio_chip gpio;
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#endif
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struct dentry *debugfs;
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};
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#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
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struct ucd9000_debugfs_entry {
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struct i2c_client *client;
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u8 index;
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};
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static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
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{
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int fan_config = 0;
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struct ucd9000_data *data
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= to_ucd9000_data(pmbus_get_driver_info(client));
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if (data->fan_data[fan][3] & 1)
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fan_config |= PB_FAN_2_INSTALLED; /* Use lower bit position */
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/* Pulses/revolution */
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fan_config |= (data->fan_data[fan][3] & 0x06) >> 1;
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return fan_config;
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}
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static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
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{
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int ret = 0;
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int fan_config;
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switch (reg) {
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case PMBUS_FAN_CONFIG_12:
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if (page > 0)
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return -ENXIO;
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ret = ucd9000_get_fan_config(client, 0);
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if (ret < 0)
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return ret;
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fan_config = ret << 4;
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ret = ucd9000_get_fan_config(client, 1);
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if (ret < 0)
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return ret;
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fan_config |= ret;
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ret = fan_config;
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break;
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case PMBUS_FAN_CONFIG_34:
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if (page > 0)
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return -ENXIO;
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ret = ucd9000_get_fan_config(client, 2);
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if (ret < 0)
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return ret;
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fan_config = ret << 4;
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ret = ucd9000_get_fan_config(client, 3);
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if (ret < 0)
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return ret;
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fan_config |= ret;
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ret = fan_config;
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break;
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default:
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ret = -ENODATA;
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break;
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}
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return ret;
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}
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static const struct i2c_device_id ucd9000_id[] = {
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{"ucd9000", ucd9000},
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{"ucd90120", ucd90120},
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{"ucd90124", ucd90124},
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{"ucd90160", ucd90160},
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{"ucd90320", ucd90320},
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{"ucd9090", ucd9090},
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{"ucd90910", ucd90910},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, ucd9000_id);
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static const struct of_device_id __maybe_unused ucd9000_of_match[] = {
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{
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.compatible = "ti,ucd9000",
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.data = (void *)ucd9000
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},
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{
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.compatible = "ti,ucd90120",
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.data = (void *)ucd90120
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},
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{
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.compatible = "ti,ucd90124",
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.data = (void *)ucd90124
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},
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{
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.compatible = "ti,ucd90160",
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.data = (void *)ucd90160
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},
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{
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.compatible = "ti,ucd90320",
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.data = (void *)ucd90320
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},
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{
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.compatible = "ti,ucd9090",
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.data = (void *)ucd9090
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},
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{
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.compatible = "ti,ucd90910",
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.data = (void *)ucd90910
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},
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{ },
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};
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MODULE_DEVICE_TABLE(of, ucd9000_of_match);
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#ifdef CONFIG_GPIOLIB
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static int ucd9000_gpio_read_config(struct i2c_client *client,
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unsigned int offset)
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{
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int ret;
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/* No page set required */
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ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_SELECT, offset);
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if (ret < 0)
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return ret;
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return i2c_smbus_read_byte_data(client, UCD9000_GPIO_CONFIG);
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}
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static int ucd9000_gpio_get(struct gpio_chip *gc, unsigned int offset)
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{
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struct i2c_client *client = gpiochip_get_data(gc);
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int ret;
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ret = ucd9000_gpio_read_config(client, offset);
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if (ret < 0)
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return ret;
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return !!(ret & UCD9000_GPIO_CONFIG_STATUS);
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}
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static void ucd9000_gpio_set(struct gpio_chip *gc, unsigned int offset,
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int value)
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{
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struct i2c_client *client = gpiochip_get_data(gc);
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int ret;
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ret = ucd9000_gpio_read_config(client, offset);
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if (ret < 0) {
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dev_dbg(&client->dev, "failed to read GPIO %d config: %d\n",
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offset, ret);
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return;
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}
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if (value) {
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if (ret & UCD9000_GPIO_CONFIG_STATUS)
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return;
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ret |= UCD9000_GPIO_CONFIG_STATUS;
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} else {
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if (!(ret & UCD9000_GPIO_CONFIG_STATUS))
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return;
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ret &= ~UCD9000_GPIO_CONFIG_STATUS;
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}
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ret |= UCD9000_GPIO_CONFIG_ENABLE;
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/* Page set not required */
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ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
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if (ret < 0) {
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dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
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offset, ret);
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return;
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}
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ret &= ~UCD9000_GPIO_CONFIG_ENABLE;
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ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
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if (ret < 0)
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dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
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offset, ret);
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}
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static int ucd9000_gpio_get_direction(struct gpio_chip *gc,
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unsigned int offset)
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{
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struct i2c_client *client = gpiochip_get_data(gc);
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int ret;
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ret = ucd9000_gpio_read_config(client, offset);
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if (ret < 0)
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return ret;
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return !(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE);
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}
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static int ucd9000_gpio_set_direction(struct gpio_chip *gc,
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unsigned int offset, bool direction_out,
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int requested_out)
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{
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struct i2c_client *client = gpiochip_get_data(gc);
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int ret, config, out_val;
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ret = ucd9000_gpio_read_config(client, offset);
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if (ret < 0)
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return ret;
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if (direction_out) {
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out_val = requested_out ? UCD9000_GPIO_CONFIG_OUT_VALUE : 0;
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if (ret & UCD9000_GPIO_CONFIG_OUT_ENABLE) {
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if ((ret & UCD9000_GPIO_CONFIG_OUT_VALUE) == out_val)
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return 0;
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} else {
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ret |= UCD9000_GPIO_CONFIG_OUT_ENABLE;
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}
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if (out_val)
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ret |= UCD9000_GPIO_CONFIG_OUT_VALUE;
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else
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ret &= ~UCD9000_GPIO_CONFIG_OUT_VALUE;
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} else {
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if (!(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE))
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return 0;
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ret &= ~UCD9000_GPIO_CONFIG_OUT_ENABLE;
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}
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ret |= UCD9000_GPIO_CONFIG_ENABLE;
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config = ret;
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/* Page set not required */
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ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
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if (ret < 0)
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return ret;
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config &= ~UCD9000_GPIO_CONFIG_ENABLE;
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return i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
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}
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static int ucd9000_gpio_direction_input(struct gpio_chip *gc,
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unsigned int offset)
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{
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return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_INPUT, 0);
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}
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static int ucd9000_gpio_direction_output(struct gpio_chip *gc,
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unsigned int offset, int val)
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{
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return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_OUTPUT,
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val);
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}
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static void ucd9000_probe_gpio(struct i2c_client *client,
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const struct i2c_device_id *mid,
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struct ucd9000_data *data)
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{
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int rc;
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switch (mid->driver_data) {
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case ucd9090:
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data->gpio.ngpio = UCD9090_NUM_GPIOS;
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break;
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case ucd90120:
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case ucd90124:
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case ucd90160:
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data->gpio.ngpio = UCD901XX_NUM_GPIOS;
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break;
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case ucd90320:
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data->gpio.ngpio = UCD90320_NUM_GPIOS;
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break;
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case ucd90910:
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data->gpio.ngpio = UCD90910_NUM_GPIOS;
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break;
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default:
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return; /* GPIO support is optional. */
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}
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/*
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* Pinmux support has not been added to the new gpio_chip.
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* This support should be added when possible given the mux
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* behavior of these IO devices.
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*/
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data->gpio.label = client->name;
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data->gpio.get_direction = ucd9000_gpio_get_direction;
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data->gpio.direction_input = ucd9000_gpio_direction_input;
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data->gpio.direction_output = ucd9000_gpio_direction_output;
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data->gpio.get = ucd9000_gpio_get;
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data->gpio.set = ucd9000_gpio_set;
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data->gpio.can_sleep = true;
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data->gpio.base = -1;
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data->gpio.parent = &client->dev;
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rc = devm_gpiochip_add_data(&client->dev, &data->gpio, client);
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if (rc)
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dev_warn(&client->dev, "Could not add gpiochip: %d\n", rc);
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}
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#else
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static void ucd9000_probe_gpio(struct i2c_client *client,
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const struct i2c_device_id *mid,
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struct ucd9000_data *data)
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{
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}
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#endif /* CONFIG_GPIOLIB */
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#ifdef CONFIG_DEBUG_FS
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static int ucd9000_get_mfr_status(struct i2c_client *client, u8 *buffer)
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{
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int ret = pmbus_set_page(client, 0, 0xff);
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if (ret < 0)
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return ret;
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return i2c_smbus_read_block_data(client, UCD9000_MFR_STATUS, buffer);
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}
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static int ucd9000_debugfs_show_mfr_status_bit(void *data, u64 *val)
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{
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struct ucd9000_debugfs_entry *entry = data;
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struct i2c_client *client = entry->client;
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u8 buffer[I2C_SMBUS_BLOCK_MAX];
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int ret, i;
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ret = ucd9000_get_mfr_status(client, buffer);
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if (ret < 0)
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return ret;
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/*
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* GPI fault bits are in sets of 8, two bytes from end of response.
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*/
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i = ret - 3 - entry->index / 8;
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if (i >= 0)
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*val = !!(buffer[i] & BIT(entry->index % 8));
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return 0;
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}
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DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_mfr_status_bit,
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ucd9000_debugfs_show_mfr_status_bit, NULL, "%1lld\n");
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static ssize_t ucd9000_debugfs_read_mfr_status(struct file *file,
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char __user *buf, size_t count,
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loff_t *ppos)
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{
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struct i2c_client *client = file->private_data;
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u8 buffer[I2C_SMBUS_BLOCK_MAX];
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char str[(I2C_SMBUS_BLOCK_MAX * 2) + 2];
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char *res;
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int rc;
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rc = ucd9000_get_mfr_status(client, buffer);
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if (rc < 0)
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return rc;
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res = bin2hex(str, buffer, min(rc, I2C_SMBUS_BLOCK_MAX));
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*res++ = '\n';
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*res = 0;
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return simple_read_from_buffer(buf, count, ppos, str, res - str);
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}
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static const struct file_operations ucd9000_debugfs_show_mfr_status_fops = {
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.llseek = noop_llseek,
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.read = ucd9000_debugfs_read_mfr_status,
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.open = simple_open,
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};
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static int ucd9000_init_debugfs(struct i2c_client *client,
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const struct i2c_device_id *mid,
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struct ucd9000_data *data)
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{
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struct dentry *debugfs;
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struct ucd9000_debugfs_entry *entries;
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int i, gpi_count;
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char name[UCD9000_DEBUGFS_NAME_LEN];
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debugfs = pmbus_get_debugfs_dir(client);
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if (!debugfs)
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return -ENOENT;
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data->debugfs = debugfs_create_dir(client->name, debugfs);
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if (!data->debugfs)
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return -ENOENT;
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/*
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* Of the chips this driver supports, only the UCD9090, UCD90160,
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* UCD90320, and UCD90910 report GPI faults in their MFR_STATUS
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* register, so only create the GPI fault debugfs attributes for those
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* chips.
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*/
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if (mid->driver_data == ucd9090 || mid->driver_data == ucd90160 ||
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mid->driver_data == ucd90320 || mid->driver_data == ucd90910) {
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gpi_count = mid->driver_data == ucd90320 ? UCD90320_GPI_COUNT
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: UCD9000_GPI_COUNT;
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entries = devm_kcalloc(&client->dev,
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gpi_count, sizeof(*entries),
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GFP_KERNEL);
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if (!entries)
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return -ENOMEM;
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for (i = 0; i < gpi_count; i++) {
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entries[i].client = client;
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entries[i].index = i;
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scnprintf(name, UCD9000_DEBUGFS_NAME_LEN,
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"gpi%d_alarm", i + 1);
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debugfs_create_file(name, 0444, data->debugfs,
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&entries[i],
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&ucd9000_debugfs_mfr_status_bit);
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}
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}
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scnprintf(name, UCD9000_DEBUGFS_NAME_LEN, "mfr_status");
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debugfs_create_file(name, 0444, data->debugfs, client,
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&ucd9000_debugfs_show_mfr_status_fops);
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return 0;
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}
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#else
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static int ucd9000_init_debugfs(struct i2c_client *client,
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const struct i2c_device_id *mid,
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struct ucd9000_data *data)
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{
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return 0;
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}
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#endif /* CONFIG_DEBUG_FS */
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static int ucd9000_probe(struct i2c_client *client)
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{
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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,
|
|
.id_table = ucd9000_id,
|
|
};
|
|
|
|
module_i2c_driver(ucd9000_driver);
|
|
|
|
MODULE_AUTHOR("Guenter Roeck");
|
|
MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
|
|
MODULE_LICENSE("GPL");
|