On 6/24/20 8:17 AM, alexandru.tachici@xxxxxxxxxx wrote: > From: Alexandru Tachici <alexandru.tachici@xxxxxxxxxx> > > Add two ioctl commands for reading the current state > of the adm1266 sequencer and sending commands. > Please note that I am not going to a accept any ioctls for hwmon drivers, much less unprivileged commands like this. Guenter > Signed-off-by: Alexandru Tachici <alexandru.tachici@xxxxxxxxxx> > --- > Documentation/hwmon/adm1266.rst | 15 +++ > .../userspace-api/ioctl/ioctl-number.rst | 1 + > drivers/hwmon/pmbus/adm1266.c | 97 +++++++++++++++++++ > include/uapi/linux/adm1266.h | 16 +++ > 4 files changed, 129 insertions(+) > create mode 100644 include/uapi/linux/adm1266.h > > diff --git a/Documentation/hwmon/adm1266.rst b/Documentation/hwmon/adm1266.rst > index 65662115750c..5dc05808db60 100644 > --- a/Documentation/hwmon/adm1266.rst > +++ b/Documentation/hwmon/adm1266.rst > @@ -33,3 +33,18 @@ inX_min Minimum Voltage. > inX_max Maximum voltage. > inX_min_alarm Voltage low alarm. > inX_max_alarm Voltage high alarm. > + > + > +User API > +======== > + > +ioctls > +------ > + > +ADM1266_SET_GO_COMMAND: > + > + Issue a GO_COMMAND to the device. > + > +ADM1266_GET_STATUS: > + > + Returns state of the sequencer. > diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst > index 59472cd6a11d..df92ca274622 100644 > --- a/Documentation/userspace-api/ioctl/ioctl-number.rst > +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst > @@ -348,6 +348,7 @@ Code Seq# Include File Comments > 0xCC 00-0F drivers/misc/ibmvmc.h pseries VMC driver > 0xCD 01 linux/reiserfs_fs.h > 0xCF 02 fs/cifs/ioctl.c > +0xD1 00-0F linux/adm1266.h > 0xDB 00-0F drivers/char/mwave/mwavepub.h > 0xDD 00-3F ZFCP device driver see drivers/s390/scsi/ > <mailto:aherrman@xxxxxxxxxx> > diff --git a/drivers/hwmon/pmbus/adm1266.c b/drivers/hwmon/pmbus/adm1266.c > index 76bf2c78e737..0960ead8d96a 100644 > --- a/drivers/hwmon/pmbus/adm1266.c > +++ b/drivers/hwmon/pmbus/adm1266.c > @@ -15,11 +15,16 @@ > #include <linux/init.h> > #include <linux/kernel.h> > #include <linux/module.h> > +#include <linux/proc_fs.h> > #include <linux/slab.h> > +#include <linux/uaccess.h> > > +#include <linux/adm1266.h> > #include "pmbus.h" > > #define ADM1266_PDIO_CONFIG 0xD4 > +#define ADM1266_GO_COMMAND 0xD8 > +#define ADM1266_READ_STATE 0xD9 > #define ADM1266_GPIO_CONFIG 0xE1 > #define ADM1266_PDIO_STATUS 0xE9 > #define ADM1266_GPIO_STATUS 0xEA > @@ -46,6 +51,7 @@ struct adm1266_data { > struct gpio_chip gc; > const char *gpio_names[ADM1266_GPIO_NR + ADM1266_PDIO_NR]; > struct i2c_client *client; > + struct mutex ioctl_mutex; /* lock ioctl access */ > }; > > /* Different from Block Read as it sends data and waits for the slave to > @@ -311,6 +317,93 @@ static int adm1266_config_gpio(struct adm1266_data *data) > } > #endif > > +static int adm1266_set_go_command_op(struct adm1266_data *data, u8 val) > +{ > + val = FIELD_GET(GENMASK(4, 0), val); > + > + return i2c_smbus_write_word_data(data->client, ADM1266_GO_COMMAND, val); > +} > + > +static int adm1266_ioctl_unlocked(struct file *fp, unsigned int cmd, > + unsigned long arg) > +{ > + int __user *argp = (int __user *)arg; > + struct adm1266_data *data; > + int val; > + int ret; > + > + data = fp->private_data; > + > + if (!argp) > + return -EINVAL; > + > + switch (cmd) { > + case ADM1266_SET_GO_COMMAND: > + if (copy_from_user(&val, argp, sizeof(int))) > + return -EFAULT; > + > + return adm1266_set_go_command_op(data, val); > + case ADM1266_GET_STATUS: > + ret = i2c_smbus_read_word_data(data->client, > + ADM1266_READ_STATE); > + > + if (ret < 0) > + return ret; > + > + if (copy_to_user(argp, &ret, sizeof(int))) > + return -EFAULT; > + > + break; > + default: > + return -ENOTTY; > + } > + > + return 0; > +} > + > +static long adm1266_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) > +{ > + struct adm1266_data *data; > + long ret; > + > + data = fp->private_data; > + > + mutex_lock(&data->ioctl_mutex); > + ret = adm1266_ioctl_unlocked(fp, cmd, arg); > + mutex_unlock(&data->ioctl_mutex); > + > + return ret; > +} > + > +static int adm1266_open(struct inode *inode, struct file *filp) > +{ > + filp->private_data = PDE_DATA(inode); > + > + return 0; > +} > + > +static const struct proc_ops adm1266_proc_ops = { > + .proc_open = adm1266_open, > + .proc_ioctl = adm1266_ioctl, > +}; > + > +static int adm1266_init_procfs(struct adm1266_data *data) > +{ > + struct proc_dir_entry *proc_dir; > + u8 proc_fs_name[32]; > + > + mutex_init(&data->ioctl_mutex); > + > + snprintf(proc_fs_name, 32, "adm1266-%x", data->client->addr); > + proc_dir = proc_create_data(proc_fs_name, 0, NULL, &adm1266_proc_ops, > + data); > + > + if (!proc_dir) > + return -EINVAL; > + > + return 0; > +} > + > static int adm1266_probe(struct i2c_client *client, > const struct i2c_device_id *id) > { > @@ -333,6 +426,10 @@ static int adm1266_probe(struct i2c_client *client, > > crc8_populate_msb(pmbus_crc_table, 0x7); > > + ret = adm1266_init_procfs(data); > + if (ret < 0) > + return ret; > + > info = &data->info; > info->pages = 17; > info->format[PSC_VOLTAGE_OUT] = linear; > diff --git a/include/uapi/linux/adm1266.h b/include/uapi/linux/adm1266.h > new file mode 100644 > index 000000000000..535d270ee8c5 > --- /dev/null > +++ b/include/uapi/linux/adm1266.h > @@ -0,0 +1,16 @@ > +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ > +/* > + * ADM1266 - Cascadable Super Sequencer with Margin > + * Control and Fault Recording > + * > + * Copyright 2020 Analog Devices Inc. > + */ > + > +#ifndef _LINUX_ADM1266_H > +#define _LINUX_ADM1266_H > + > +/* ADM1266 ioctl commands */ > +#define ADM1266_SET_GO_COMMAND _IOW(0xD1, 0x00, int) > +#define ADM1266_GET_STATUS _IOR(0xD1, 0x01, int) > + > +#endif >
