[RFC linux v2 1/2] drivers/hwmon: Move OCC driver to occ directory
eajames.ibm at gmail.com
eajames.ibm at gmail.com
Wed Oct 12 08:42:26 AEDT 2016
From: "Edward A. James" <eajames at us.ibm.com>
- Move the existing OCC hwmon driver to it's own directory.
- Edit makefiles and Kconfig accordingly to preserve the build.
Signed-off-by: Edward A. James <eajames at us.ibm.com>
---
drivers/hwmon/Kconfig | 13 +-
drivers/hwmon/Makefile | 2 +-
drivers/hwmon/occ/Kconfig | 15 +
drivers/hwmon/occ/Makefile | 1 +
drivers/hwmon/occ/power8_occ.c | 1254 ++++++++++++++++++++++++++++++++++++++++
drivers/hwmon/power8_occ_i2c.c | 1254 ----------------------------------------
6 files changed, 1272 insertions(+), 1267 deletions(-)
create mode 100644 drivers/hwmon/occ/Kconfig
create mode 100644 drivers/hwmon/occ/Makefile
create mode 100644 drivers/hwmon/occ/power8_occ.c
delete mode 100644 drivers/hwmon/power8_occ_i2c.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 3b34ba9..0ef3690 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1216,18 +1216,7 @@ config SENSORS_NSA320
This driver can also be built as a module. If so, the module
will be called nsa320-hwmon.
-config SENSORS_POWER8_OCC_I2C
- tristate "Power8 On Chip Controller i2c driver"
- depends on I2C
- help
- If you say yes here you get support to monitor Power8 CPU
- sensors via the On Chip Controller (OCC) over the i2c bus.
-
- Generally this is used by management controllers such as a BMC
- on an OpenPower system.
-
- This driver can also be built as a module. If so, the module
- will be called power8_occ_i2c.
+source drivers/hwmon/occ/Kconfig
config SENSORS_PCF8591
tristate "Philips PCF8591 ADC/DAC"
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index c0f3201..7f61e31 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -127,7 +127,6 @@ obj-$(CONFIG_SENSORS_NCT7802) += nct7802.o
obj-$(CONFIG_SENSORS_NCT7904) += nct7904.o
obj-$(CONFIG_SENSORS_NSA320) += nsa320-hwmon.o
obj-$(CONFIG_SENSORS_NTC_THERMISTOR) += ntc_thermistor.o
-obj-$(CONFIG_SENSORS_POWER8_OCC_I2C) += power8_occ_i2c.o
obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
@@ -165,6 +164,7 @@ obj-$(CONFIG_SENSORS_WM831X) += wm831x-hwmon.o
obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o
obj-$(CONFIG_PMBUS) += pmbus/
+obj-$(CONFI_OCC) += occ/
ccflags-$(CONFIG_HWMON_DEBUG_CHIP) := -DDEBUG
diff --git a/drivers/hwmon/occ/Kconfig b/drivers/hwmon/occ/Kconfig
new file mode 100644
index 0000000..628fd6e
--- /dev/null
+++ b/drivers/hwmon/occ/Kconfig
@@ -0,0 +1,15 @@
+#
+# On Chip Controller configuration
+#
+
+config OCC
+ tristate "On Chip Controller driver"
+ help
+ If you say yes here you get support to monitor Power CPU
+ sensors via the On Chip Controller (OCC).
+
+ Generally this is used by management controllers such as a BMC
+ on an OpenPower system.
+
+ This driver can also be built as a module. If so, the module
+ will be called occ.
diff --git a/drivers/hwmon/occ/Makefile b/drivers/hwmon/occ/Makefile
new file mode 100644
index 0000000..1322961
--- /dev/null
+++ b/drivers/hwmon/occ/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_OCC) += power8_occ.o
diff --git a/drivers/hwmon/occ/power8_occ.c b/drivers/hwmon/occ/power8_occ.c
new file mode 100644
index 0000000..6de0e76
--- /dev/null
+++ b/drivers/hwmon/occ/power8_occ.c
@@ -0,0 +1,1254 @@
+/*
+ * OCC HWMON driver - read IBM Power8 On Chip Controller sensor data via
+ * i2c.
+ *
+ * Copyright 2015 IBM Corp.
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+
+#define OCC_I2C_ADDR 0x50
+#define OCC_I2C_NAME "occ-i2c"
+
+#define OCC_DATA_MAX 4096 /* 4KB at most */
+/* i2c read and write occ sensors */
+#define I2C_READ_ERROR 1
+#define I2C_WRITE_ERROR 2
+
+/* Defined in POWER8 Processor Registers Specification */
+/* To generate attn to OCC */
+#define ATTN_DATA 0x0006B035
+/* For BMC to read/write SRAM */
+#define OCB_ADDRESS 0x0006B070
+#define OCB_DATA 0x0006B075
+#define OCB_STATUS_CONTROL_AND 0x0006B072
+#define OCB_STATUS_CONTROL_OR 0x0006B073
+/* See definition in:
+ * https://github.com/open-power/docs/blob/master/occ/OCC_OpenPwr_FW_Interfaces.pdf
+ */
+#define OCC_COMMAND_ADDR 0xFFFF6000
+#define OCC_RESPONSE_ADDR 0xFFFF7000
+
+#define MAX_SENSOR_ATTR_LEN 32
+
+enum sensor_t {
+ freq,
+ temp,
+ power,
+ caps,
+ MAX_OCC_SENSOR_TYPE
+};
+
+/* OCC sensor data format */
+struct occ_sensor {
+ uint16_t sensor_id;
+ uint16_t value;
+};
+
+struct power_sensor {
+ uint16_t sensor_id;
+ uint32_t update_tag;
+ uint32_t accumulator;
+ uint16_t value;
+};
+
+struct caps_sensor {
+ uint16_t curr_powercap;
+ uint16_t curr_powerreading;
+ uint16_t norm_powercap;
+ uint16_t max_powercap;
+ uint16_t min_powercap;
+ uint16_t user_powerlimit;
+};
+
+struct sensor_data_block {
+ uint8_t sensor_type[4];
+ uint8_t reserved0;
+ uint8_t sensor_format;
+ uint8_t sensor_length;
+ uint8_t sensor_num;
+ struct occ_sensor *sensor;
+ struct power_sensor *power;
+ struct caps_sensor *caps;
+};
+
+struct occ_poll_header {
+ uint8_t status;
+ uint8_t ext_status;
+ uint8_t occs_present;
+ uint8_t config;
+ uint8_t occ_state;
+ uint8_t reserved0;
+ uint8_t reserved1;
+ uint8_t error_log_id;
+ uint32_t error_log_addr_start;
+ uint16_t error_log_length;
+ uint8_t reserved2;
+ uint8_t reserved3;
+ uint8_t occ_code_level[16];
+ uint8_t sensor_eye_catcher[6];
+ uint8_t sensor_block_num;
+ uint8_t sensor_data_version;
+};
+
+struct occ_response {
+ uint8_t sequence_num;
+ uint8_t cmd_type;
+ uint8_t rtn_status;
+ uint16_t data_length;
+ struct occ_poll_header header;
+ struct sensor_data_block *blocks;
+ uint16_t chk_sum;
+ int sensor_block_id[MAX_OCC_SENSOR_TYPE];
+};
+
+struct sensor_attr_data {
+ enum sensor_t type;
+ uint32_t hwmon_index;
+ uint32_t attr_id;
+ char name[MAX_SENSOR_ATTR_LEN];
+ struct device_attribute dev_attr;
+};
+
+struct sensor_group {
+ char *name;
+ struct sensor_attr_data *sattr;
+ struct attribute_group group;
+};
+
+/* data private to each client */
+struct occ_drv_data {
+ struct i2c_client *client;
+ struct device *hwmon_dev;
+ struct mutex update_lock;
+ bool valid;
+ unsigned long last_updated;
+ /* Minimum timer interval for sampling In jiffies */
+ unsigned long update_interval;
+ unsigned long occ_online;
+ uint16_t user_powercap;
+ struct occ_response occ_resp;
+ struct sensor_group sensor_groups[MAX_OCC_SENSOR_TYPE];
+};
+
+static void deinit_occ_resp_buf(struct occ_response *p)
+{
+ int i;
+
+ if (!p)
+ return;
+
+ if (!p->blocks)
+ return;
+
+ for (i = 0; i < p->header.sensor_block_num; i++) {
+ kfree(p->blocks[i].sensor);
+ kfree(p->blocks[i].power);
+ kfree(p->blocks[i].caps);
+ }
+
+ kfree(p->blocks);
+
+ memset(p, 0, sizeof(*p));
+
+ for (i = 0; i < ARRAY_SIZE(p->sensor_block_id); i++)
+ p->sensor_block_id[i] = -1;
+}
+
+static ssize_t occ_i2c_read(struct i2c_client *client, void *buf, size_t count)
+{
+ WARN_ON(count > OCC_DATA_MAX);
+
+ dev_dbg(&client->dev, "i2c_read: reading %zu bytes @0x%x.\n",
+ count, client->addr);
+ return i2c_master_recv(client, buf, count);
+}
+
+static ssize_t occ_i2c_write(struct i2c_client *client, const void *buf,
+ size_t count)
+{
+ WARN_ON(count > OCC_DATA_MAX);
+
+ dev_dbg(&client->dev, "i2c_write: writing %zu bytes @0x%x.\n",
+ count, client->addr);
+ return i2c_master_send(client, buf, count);
+}
+
+/* read 8-byte value and put into data[offset] */
+static int occ_getscomb(struct i2c_client *client, uint32_t address,
+ uint8_t *data, int offset)
+{
+ uint32_t ret;
+ char buf[8];
+ int i;
+
+ /* P8 i2c slave requires address to be shifted by 1 */
+ address = address << 1;
+
+ ret = occ_i2c_write(client, &address,
+ sizeof(address));
+
+ if (ret != sizeof(address))
+ return -I2C_WRITE_ERROR;
+
+ ret = occ_i2c_read(client, buf, sizeof(buf));
+ if (ret != sizeof(buf))
+ return -I2C_READ_ERROR;
+
+ for (i = 0; i < 8; i++)
+ data[offset + i] = buf[7 - i];
+
+ return 0;
+}
+
+static int occ_putscom(struct i2c_client *client, uint32_t address,
+ uint32_t data0, uint32_t data1)
+{
+ uint32_t buf[3];
+ uint32_t ret;
+
+ /* P8 i2c slave requires address to be shifted by 1 */
+ address = address << 1;
+
+ buf[0] = address;
+ buf[1] = data1;
+ buf[2] = data0;
+
+ ret = occ_i2c_write(client, buf, sizeof(buf));
+ if (ret != sizeof(buf))
+ return I2C_WRITE_ERROR;
+
+ return 0;
+}
+
+static void *occ_get_sensor_by_type(struct occ_response *resp, enum sensor_t t)
+{
+ void *sensor;
+
+ if (!resp->blocks)
+ return NULL;
+
+ if (resp->sensor_block_id[t] == -1)
+ return NULL;
+
+ switch (t) {
+ case temp:
+ case freq:
+ sensor = resp->blocks[resp->sensor_block_id[t]].sensor;
+ break;
+ case power:
+ sensor = resp->blocks[resp->sensor_block_id[t]].power;
+ break;
+ case caps:
+ sensor = resp->blocks[resp->sensor_block_id[t]].caps;
+ break;
+ default:
+ sensor = NULL;
+ }
+
+ return sensor;
+}
+
+static int occ_renew_sensor(struct occ_response *resp, uint8_t sensor_length,
+ uint8_t sensor_num, enum sensor_t t, int block)
+{
+ void *sensor;
+ int ret;
+
+ sensor = occ_get_sensor_by_type(resp, t);
+
+ /* empty sensor block, release older sensor data */
+ if (sensor_num == 0 || sensor_length == 0) {
+ kfree(sensor);
+ return -1;
+ }
+
+ if (!sensor || sensor_num !=
+ resp->blocks[resp->sensor_block_id[t]].sensor_num) {
+ kfree(sensor);
+ switch (t) {
+ case temp:
+ case freq:
+ resp->blocks[block].sensor =
+ kcalloc(sensor_num,
+ sizeof(struct occ_sensor), GFP_KERNEL);
+ if (!resp->blocks[block].sensor) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ break;
+ case power:
+ resp->blocks[block].power =
+ kcalloc(sensor_num,
+ sizeof(struct power_sensor),
+ GFP_KERNEL);
+ if (!resp->blocks[block].power) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ break;
+ case caps:
+ resp->blocks[block].caps =
+ kcalloc(sensor_num,
+ sizeof(struct caps_sensor), GFP_KERNEL);
+ if (!resp->blocks[block].caps) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ break;
+ default:
+ ret = -ENOMEM;
+ goto err;
+ }
+ }
+
+ return 0;
+err:
+ deinit_occ_resp_buf(resp);
+ return ret;
+}
+
+#define RESP_DATA_LENGTH 3
+#define RESP_HEADER_OFFSET 5
+#define SENSOR_STR_OFFSET 37
+#define SENSOR_BLOCK_NUM_OFFSET 43
+#define SENSOR_BLOCK_OFFSET 45
+
+static inline uint16_t get_occdata_length(uint8_t *data)
+{
+ return be16_to_cpup((const __be16 *)&data[RESP_DATA_LENGTH]);
+}
+
+static int parse_occ_response(struct i2c_client *client,
+ uint8_t *data, struct occ_response *resp)
+{
+ int b;
+ int s;
+ int ret;
+ int dnum = SENSOR_BLOCK_OFFSET;
+ struct occ_sensor *f_sensor;
+ struct occ_sensor *t_sensor;
+ struct power_sensor *p_sensor;
+ struct caps_sensor *c_sensor;
+ uint8_t sensor_block_num;
+ uint8_t sensor_type[4];
+ uint8_t sensor_format;
+ uint8_t sensor_length;
+ uint8_t sensor_num;
+
+ /* check if the data is valid */
+ if (strncmp(&data[SENSOR_STR_OFFSET], "SENSOR", 6) != 0) {
+ dev_dbg(&client->dev,
+ "ERROR: no SENSOR String in response\n");
+ ret = -1;
+ goto err;
+ }
+
+ sensor_block_num = data[SENSOR_BLOCK_NUM_OFFSET];
+ if (sensor_block_num == 0) {
+ dev_dbg(&client->dev, "ERROR: SENSOR block num is 0\n");
+ ret = -1;
+ goto err;
+ }
+
+ /* if sensor block has changed, re-malloc */
+ if (sensor_block_num != resp->header.sensor_block_num) {
+ deinit_occ_resp_buf(resp);
+ resp->blocks = kcalloc(sensor_block_num,
+ sizeof(struct sensor_data_block), GFP_KERNEL);
+ if (!resp->blocks)
+ return -ENOMEM;
+ }
+
+ memcpy(&resp->header, &data[RESP_HEADER_OFFSET], sizeof(resp->header));
+ resp->header.error_log_addr_start =
+ be32_to_cpu(resp->header.error_log_addr_start);
+ resp->header.error_log_length =
+ be16_to_cpu(resp->header.error_log_length);
+
+ dev_dbg(&client->dev, "Reading %d sensor blocks\n",
+ resp->header.sensor_block_num);
+ for (b = 0; b < sensor_block_num; b++) {
+ /* 8-byte sensor block head */
+ strncpy(sensor_type, &data[dnum], 4);
+ sensor_format = data[dnum+5];
+ sensor_length = data[dnum+6];
+ sensor_num = data[dnum+7];
+ dnum = dnum + 8;
+
+ dev_dbg(&client->dev,
+ "sensor block[%d]: type: %s, sensor_num: %d\n",
+ b, sensor_type, sensor_num);
+
+ if (strncmp(sensor_type, "FREQ", 4) == 0) {
+ ret = occ_renew_sensor(resp, sensor_length,
+ sensor_num, freq, b);
+ if (ret)
+ continue;
+
+ resp->sensor_block_id[freq] = b;
+ for (s = 0; s < sensor_num; s++) {
+ f_sensor = &resp->blocks[b].sensor[s];
+ f_sensor->sensor_id =
+ be16_to_cpup((const __be16 *)
+ &data[dnum]);
+ f_sensor->value = be16_to_cpup((const __be16 *)
+ &data[dnum+2]);
+ dev_dbg(&client->dev,
+ "sensor[%d]-[%d]: id: %u, value: %u\n",
+ b, s, f_sensor->sensor_id,
+ f_sensor->value);
+ dnum = dnum + sensor_length;
+ }
+ } else if (strncmp(sensor_type, "TEMP", 4) == 0) {
+ ret = occ_renew_sensor(resp, sensor_length,
+ sensor_num, temp, b);
+ if (ret)
+ continue;
+
+ resp->sensor_block_id[temp] = b;
+ for (s = 0; s < sensor_num; s++) {
+ t_sensor = &resp->blocks[b].sensor[s];
+ t_sensor->sensor_id =
+ be16_to_cpup((const __be16 *)
+ &data[dnum]);
+ t_sensor->value = be16_to_cpup((const __be16 *)
+ &data[dnum+2]);
+ dev_dbg(&client->dev,
+ "sensor[%d]-[%d]: id: %u, value: %u\n",
+ b, s, t_sensor->sensor_id,
+ t_sensor->value);
+ dnum = dnum + sensor_length;
+ }
+ } else if (strncmp(sensor_type, "POWR", 4) == 0) {
+ ret = occ_renew_sensor(resp, sensor_length,
+ sensor_num, power, b);
+ if (ret)
+ continue;
+
+ resp->sensor_block_id[power] = b;
+ for (s = 0; s < sensor_num; s++) {
+ p_sensor = &resp->blocks[b].power[s];
+ p_sensor->sensor_id =
+ be16_to_cpup((const __be16 *)
+ &data[dnum]);
+ p_sensor->update_tag =
+ be32_to_cpup((const __be32 *)
+ &data[dnum+2]);
+ p_sensor->accumulator =
+ be32_to_cpup((const __be32 *)
+ &data[dnum+6]);
+ p_sensor->value = be16_to_cpup((const __be16 *)
+ &data[dnum+10]);
+
+ dev_dbg(&client->dev,
+ "sensor[%d]-[%d]: id: %u, value: %u\n",
+ b, s, p_sensor->sensor_id,
+ p_sensor->value);
+
+ dnum = dnum + sensor_length;
+ }
+ } else if (strncmp(sensor_type, "CAPS", 4) == 0) {
+ ret = occ_renew_sensor(resp, sensor_length,
+ sensor_num, caps, b);
+ if (ret)
+ continue;
+
+ resp->sensor_block_id[caps] = b;
+ for (s = 0; s < sensor_num; s++) {
+ c_sensor = &resp->blocks[b].caps[s];
+ c_sensor->curr_powercap =
+ be16_to_cpup((const __be16 *)
+ &data[dnum]);
+ c_sensor->curr_powerreading =
+ be16_to_cpup((const __be16 *)
+ &data[dnum+2]);
+ c_sensor->norm_powercap =
+ be16_to_cpup((const __be16 *)
+ &data[dnum+4]);
+ c_sensor->max_powercap =
+ be16_to_cpup((const __be16 *)
+ &data[dnum+6]);
+ c_sensor->min_powercap =
+ be16_to_cpup((const __be16 *)
+ &data[dnum+8]);
+ c_sensor->user_powerlimit =
+ be16_to_cpup((const __be16 *)
+ &data[dnum+10]);
+
+ dnum = dnum + sensor_length;
+ dev_dbg(&client->dev, "CAPS sensor #%d:\n", s);
+ dev_dbg(&client->dev, "curr_powercap is %x\n",
+ c_sensor->curr_powercap);
+ dev_dbg(&client->dev,
+ "curr_powerreading is %x\n",
+ c_sensor->curr_powerreading);
+ dev_dbg(&client->dev, "norm_powercap is %x\n",
+ c_sensor->norm_powercap);
+ dev_dbg(&client->dev, "max_powercap is %x\n",
+ c_sensor->max_powercap);
+ dev_dbg(&client->dev, "min_powercap is %x\n",
+ c_sensor->min_powercap);
+ dev_dbg(&client->dev, "user_powerlimit is %x\n",
+ c_sensor->user_powerlimit);
+ }
+
+ } else {
+ dev_dbg(&client->dev,
+ "ERROR: sensor type %s not supported\n",
+ resp->blocks[b].sensor_type);
+ ret = -1;
+ goto err;
+ }
+
+ strncpy(resp->blocks[b].sensor_type, sensor_type, 4);
+ resp->blocks[b].sensor_format = sensor_format;
+ resp->blocks[b].sensor_length = sensor_length;
+ resp->blocks[b].sensor_num = sensor_num;
+ }
+
+ return 0;
+err:
+ deinit_occ_resp_buf(resp);
+ return ret;
+}
+
+
+/* Refer to OCC interface document for OCC command format
+ * https://github.com/open-power/docs/blob/master/occ/OCC_OpenPwr_FW_Interfaces.pdf
+ */
+static uint8_t occ_send_cmd(struct i2c_client *client, uint8_t seq,
+ uint8_t type, uint16_t length, uint8_t *data, uint8_t *resp)
+{
+ uint32_t cmd1, cmd2;
+ uint16_t checksum;
+ int i;
+
+ length = cpu_to_le16(length);
+ cmd1 = (seq << 24) | (type << 16) | length;
+ memcpy(&cmd2, data, length);
+ cmd2 <<= ((4 - length) * 8);
+
+ /* checksum: sum of every bytes of cmd1, cmd2 */
+ checksum = 0;
+ for (i = 0; i < 4; i++)
+ checksum += (cmd1 >> (i * 8)) & 0xFF;
+ for (i = 0; i < 4; i++)
+ checksum += (cmd2 >> (i * 8)) & 0xFF;
+ cmd2 |= checksum << ((2 - length) * 8);
+
+ /* Init OCB */
+ occ_putscom(client, OCB_STATUS_CONTROL_OR, 0x08000000, 0x00000000);
+ occ_putscom(client, OCB_STATUS_CONTROL_AND, 0xFBFFFFFF, 0xFFFFFFFF);
+
+ /* Send command */
+ occ_putscom(client, OCB_ADDRESS, OCC_COMMAND_ADDR, 0x00000000);
+ occ_putscom(client, OCB_ADDRESS, OCC_COMMAND_ADDR, 0x00000000);
+ occ_putscom(client, OCB_DATA, cmd1, cmd2);
+
+ /* Trigger attention */
+ occ_putscom(client, ATTN_DATA, 0x01010000, 0x00000000);
+
+ /* Get response data */
+ occ_putscom(client, OCB_ADDRESS, OCC_RESPONSE_ADDR, 0x00000000);
+ occ_getscomb(client, OCB_DATA, resp, 0);
+
+ /* return status */
+ return resp[2];
+}
+
+static int occ_get_all(struct i2c_client *client, struct occ_response *occ_resp)
+{
+ uint8_t *occ_data;
+ uint16_t num_bytes;
+ int i;
+ int ret;
+ uint8_t poll_cmd_data;
+
+ poll_cmd_data = 0x10;
+
+ /*
+ * TODO: fetch header, and then allocate the rest of the buffer based
+ * on the header size. Assuming the OCC has a fixed sized header
+ */
+ occ_data = devm_kzalloc(&client->dev, OCC_DATA_MAX, GFP_KERNEL);
+
+ ret = occ_send_cmd(client, 0, 0, 1, &poll_cmd_data, occ_data);
+ if (ret) {
+ dev_err(&client->dev, "ERROR: OCC Poll: 0x%x\n", ret);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ num_bytes = get_occdata_length(occ_data);
+
+ dev_dbg(&client->dev, "OCC data length: %d\n", num_bytes);
+
+ if (num_bytes > OCC_DATA_MAX) {
+ dev_dbg(&client->dev, "ERROR: OCC data length must be < 4KB\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (num_bytes <= 0) {
+ dev_dbg(&client->dev, "ERROR: OCC data length is zero\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* read remaining data */
+ for (i = 8; i < num_bytes + 8; i = i + 8)
+ occ_getscomb(client, OCB_DATA, occ_data, i);
+
+ ret = parse_occ_response(client, occ_data, occ_resp);
+
+out:
+ devm_kfree(&client->dev, occ_data);
+ return ret;
+}
+
+
+static int occ_update_device(struct device *dev)
+{
+ struct occ_drv_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ int ret = 0;
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + data->update_interval)
+ || !data->valid) {
+ data->valid = 1;
+ ret = occ_get_all(client, &data->occ_resp);
+ if (ret)
+ data->valid = 0;
+ data->last_updated = jiffies;
+ }
+ mutex_unlock(&data->update_lock);
+
+ return ret;
+}
+
+
+static void *occ_get_sensor(struct device *hwmon_dev, enum sensor_t t)
+{
+ struct device *dev = hwmon_dev->parent;
+ struct occ_drv_data *data = dev_get_drvdata(dev);
+ int ret;
+
+ ret = occ_update_device(dev);
+ if (ret != 0) {
+ dev_dbg(dev, "ERROR: cannot get occ sensor data: %d\n", ret);
+ return NULL;
+ }
+
+ return occ_get_sensor_by_type(&data->occ_resp, t);
+}
+
+static int occ_get_sensor_value(struct device *hwmon_dev, enum sensor_t t,
+ int index)
+{
+ void *sensor;
+
+ if (t == caps)
+ return -1;
+
+ sensor = occ_get_sensor(hwmon_dev, t);
+
+ if (!sensor)
+ return -1;
+
+ if (t == power)
+ return ((struct power_sensor *)sensor)[index].value;
+
+ return ((struct occ_sensor *)sensor)[index].value;
+}
+
+static int occ_get_sensor_id(struct device *hwmon_dev, enum sensor_t t,
+ int index)
+{
+ void *sensor;
+
+ if (t == caps)
+ return -1;
+
+ sensor = occ_get_sensor(hwmon_dev, t);
+
+ if (!sensor)
+ return -1;
+
+ if (t == power)
+ return ((struct power_sensor *)sensor)[index].sensor_id;
+
+ return ((struct occ_sensor *)sensor)[index].sensor_id;
+}
+
+/* sysfs attributes for occ hwmon device */
+
+static ssize_t show_input(struct device *hwmon_dev,
+ struct device_attribute *da, char *buf)
+{
+ struct sensor_attr_data *sdata = container_of(da,
+ struct sensor_attr_data, dev_attr);
+ int val;
+
+ val = occ_get_sensor_value(hwmon_dev, sdata->type,
+ sdata->hwmon_index - 1);
+ if (sdata->type == temp)
+ /* in millidegree Celsius */
+ val *= 1000;
+
+ return snprintf(buf, PAGE_SIZE - 1, "%d\n", val);
+}
+
+static ssize_t show_label(struct device *hwmon_dev,
+ struct device_attribute *da, char *buf)
+{
+ struct sensor_attr_data *sdata = container_of(da,
+ struct sensor_attr_data, dev_attr);
+ int val;
+
+ val = occ_get_sensor_id(hwmon_dev, sdata->type,
+ sdata->hwmon_index - 1);
+
+ return snprintf(buf, PAGE_SIZE - 1, "%d\n", val);
+}
+
+static ssize_t show_caps(struct device *hwmon_dev,
+ struct device_attribute *da, char *buf)
+{
+ struct sensor_attr_data *sdata = container_of(da,
+ struct sensor_attr_data, dev_attr);
+ int nr = sdata->attr_id;
+ int n = sdata->hwmon_index - 1;
+ struct caps_sensor *sensor;
+ int val;
+
+ sensor = occ_get_sensor(hwmon_dev, caps);
+ if (!sensor) {
+ val = -1;
+ return snprintf(buf, PAGE_SIZE - 1, "%d\n", val);
+ }
+
+ switch (nr) {
+ case 0:
+ val = sensor[n].curr_powercap;
+ break;
+ case 1:
+ val = sensor[n].curr_powerreading;
+ break;
+ case 2:
+ val = sensor[n].norm_powercap;
+ break;
+ case 3:
+ val = sensor[n].max_powercap;
+ break;
+ case 4:
+ val = sensor[n].min_powercap;
+ break;
+ case 5:
+ val = sensor[n].user_powerlimit;
+ break;
+ default:
+ val = -1;
+ }
+
+ return snprintf(buf, PAGE_SIZE - 1, "%d\n", val);
+}
+
+static ssize_t show_update_interval(struct device *hwmon_dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct device *dev = hwmon_dev->parent;
+ struct occ_drv_data *data = dev_get_drvdata(dev);
+
+ return snprintf(buf, PAGE_SIZE - 1, "%u\n",
+ jiffies_to_msecs(data->update_interval));
+}
+
+static ssize_t set_update_interval(struct device *hwmon_dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct device *dev = hwmon_dev->parent;
+ struct occ_drv_data *data = dev_get_drvdata(dev);
+ unsigned long val;
+ int err;
+
+ err = kstrtoul(buf, 10, &val);
+ if (err)
+ return err;
+
+ data->update_interval = msecs_to_jiffies(val);
+ return count;
+}
+static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,
+ show_update_interval, set_update_interval);
+
+static ssize_t show_name(struct device *hwmon_dev,
+ struct device_attribute *attr, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE - 1, "%s\n", OCC_I2C_NAME);
+}
+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+
+static ssize_t show_user_powercap(struct device *hwmon_dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct device *dev = hwmon_dev->parent;
+ struct occ_drv_data *data = dev_get_drvdata(dev);
+
+ return snprintf(buf, PAGE_SIZE - 1, "%u\n", data->user_powercap);
+}
+
+
+static ssize_t set_user_powercap(struct device *hwmon_dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct device *dev = hwmon_dev->parent;
+ struct occ_drv_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ uint16_t val;
+ uint8_t resp[8];
+ int err;
+
+ err = kstrtou16(buf, 10, &val);
+ if (err)
+ return err;
+
+ dev_dbg(dev, "set user powercap to: %u\n", val);
+ val = cpu_to_le16(val);
+ err = occ_send_cmd(client, 0, 0x22, 2, (uint8_t *)&val, resp);
+ if (err != 0) {
+ dev_dbg(dev,
+ "ERROR: Set User Powercap: wrong return status: %x\n",
+ err);
+ if (err == 0x13)
+ dev_info(dev,
+ "ERROR: set invalid powercap value: %x\n", val);
+ return -EINVAL;
+ }
+ data->user_powercap = val;
+ return count;
+}
+static DEVICE_ATTR(user_powercap, S_IWUSR | S_IRUGO,
+ show_user_powercap, set_user_powercap);
+
+static void deinit_sensor_groups(struct device *hwmon_dev,
+ struct sensor_group *sensor_groups)
+{
+ int cnt;
+
+ for (cnt = 0; cnt < MAX_OCC_SENSOR_TYPE; cnt++) {
+ if (sensor_groups[cnt].group.attrs)
+ devm_kfree(hwmon_dev, sensor_groups[cnt].group.attrs);
+ if (sensor_groups[cnt].sattr)
+ devm_kfree(hwmon_dev, sensor_groups[cnt].sattr);
+ sensor_groups[cnt].group.attrs = NULL;
+ sensor_groups[cnt].sattr = NULL;
+ }
+}
+
+static void occ_remove_hwmon_attrs(struct device *hwmon_dev)
+{
+ struct occ_drv_data *data = dev_get_drvdata(hwmon_dev->parent);
+ struct sensor_group *sensor_groups = data->sensor_groups;
+ int i;
+
+ if (!hwmon_dev)
+ return;
+
+ device_remove_file(hwmon_dev, &dev_attr_update_interval);
+ device_remove_file(hwmon_dev, &dev_attr_name);
+ device_remove_file(hwmon_dev, &dev_attr_user_powercap);
+
+ for (i = 0; i < MAX_OCC_SENSOR_TYPE; i++)
+ sysfs_remove_group(&hwmon_dev->kobj, &sensor_groups[i].group);
+
+ deinit_sensor_groups(hwmon_dev, sensor_groups);
+}
+
+static void sensor_attr_init(struct sensor_attr_data *sdata,
+ char *sensor_group_name,
+ char *attr_name,
+ ssize_t (*show)(struct device *dev,
+ struct device_attribute *attr,
+ char *buf))
+{
+ sysfs_attr_init(&sdata->dev_attr.attr);
+
+ snprintf(sdata->name, MAX_SENSOR_ATTR_LEN, "%s%d_%s",
+ sensor_group_name, sdata->hwmon_index, attr_name);
+ sdata->dev_attr.attr.name = sdata->name;
+ sdata->dev_attr.attr.mode = S_IRUGO;
+ sdata->dev_attr.show = show;
+}
+
+/* create hwmon sensor sysfs attributes */
+static int create_sensor_group(struct device *hwmon_dev, enum sensor_t type,
+ int sensor_num)
+{
+ struct occ_drv_data *data = dev_get_drvdata(hwmon_dev->parent);
+ struct sensor_group *sensor_groups = data->sensor_groups;
+ struct sensor_attr_data *sdata;
+ int ret;
+ int cnt;
+
+ /* each sensor has 'label' and 'input' attributes */
+ sensor_groups[type].group.attrs = devm_kzalloc(hwmon_dev,
+ sizeof(struct attribute *) *
+ sensor_num * 2 + 1, GFP_KERNEL);
+ if (!sensor_groups[type].group.attrs) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ sensor_groups[type].sattr = devm_kzalloc(hwmon_dev,
+ sizeof(struct sensor_attr_data) *
+ sensor_num * 2, GFP_KERNEL);
+ if (!sensor_groups[type].sattr) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ for (cnt = 0; cnt < sensor_num; cnt++) {
+ sdata = &sensor_groups[type].sattr[cnt];
+ /* hwomon attributes index starts from 1 */
+ sdata->hwmon_index = cnt + 1;
+ sdata->type = type;
+ sensor_attr_init(sdata, sensor_groups[type].name, "input",
+ show_input);
+ sensor_groups[type].group.attrs[cnt] = &sdata->dev_attr.attr;
+
+ sdata = &sensor_groups[type].sattr[cnt + sensor_num];
+ sdata->hwmon_index = cnt + 1;
+ sdata->type = type;
+ sensor_attr_init(sdata, sensor_groups[type].name, "label",
+ show_label);
+ sensor_groups[type].group.attrs[cnt + sensor_num] =
+ &sdata->dev_attr.attr;
+ }
+
+ ret = sysfs_create_group(&hwmon_dev->kobj, &sensor_groups[type].group);
+ if (ret)
+ goto err;
+
+ return ret;
+err:
+ deinit_sensor_groups(hwmon_dev, sensor_groups);
+ return ret;
+}
+
+static void caps_sensor_attr_init(struct sensor_attr_data *sdata,
+ char *attr_name, uint32_t hwmon_index,
+ uint32_t attr_id)
+{
+ sdata->type = caps;
+ sdata->hwmon_index = hwmon_index;
+ sdata->attr_id = attr_id;
+
+ /* FIXME, to be compatible with user space app, we do not
+ * generate caps1_* attributes.
+ */
+ if (sdata->hwmon_index == 1)
+ snprintf(sdata->name, MAX_SENSOR_ATTR_LEN, "%s_%s",
+ "caps", attr_name);
+ else
+ snprintf(sdata->name, MAX_SENSOR_ATTR_LEN, "%s%d_%s",
+ "caps", sdata->hwmon_index, attr_name);
+
+ sysfs_attr_init(&sdata->dev_attr.attr);
+ sdata->dev_attr.attr.name = sdata->name;
+ sdata->dev_attr.attr.mode = S_IRUGO;
+ sdata->dev_attr.show = show_caps;
+}
+
+static char *caps_sensor_name[] = {
+ "curr_powercap",
+ "curr_powerreading",
+ "norm_powercap",
+ "max_powercap",
+ "min_powercap",
+ "user_powerlimit",
+};
+
+static int create_caps_sensor_group(struct device *hwmon_dev, int sensor_num)
+{
+ struct occ_drv_data *data = dev_get_drvdata(hwmon_dev->parent);
+ struct sensor_group *sensor_groups = data->sensor_groups;
+ int field_num = ARRAY_SIZE(caps_sensor_name);
+ struct sensor_attr_data *sdata;
+ int ret;
+ int cnt;
+ int i;
+
+ sensor_groups[caps].group.attrs = devm_kzalloc(hwmon_dev,
+ sizeof(struct attribute *) *
+ sensor_num * field_num + 1,
+ GFP_KERNEL);
+ if (!sensor_groups[caps].group.attrs) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ sensor_groups[caps].sattr = devm_kzalloc(hwmon_dev,
+ sizeof(struct sensor_attr_data) *
+ sensor_num * field_num,
+ GFP_KERNEL);
+ if (!sensor_groups[caps].sattr) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ for (cnt = 0; cnt < sensor_num; cnt++) {
+ for (i = 0; i < field_num; i++) {
+ sdata = &sensor_groups[caps].sattr[cnt * field_num + i];
+ caps_sensor_attr_init(sdata, caps_sensor_name[i],
+ cnt + 1, i);
+ sensor_groups[caps].group.attrs[cnt * field_num + i] =
+ &sdata->dev_attr.attr;
+ }
+ }
+
+ ret = sysfs_create_group(&hwmon_dev->kobj, &sensor_groups[caps].group);
+ if (ret)
+ goto err;
+
+ return ret;
+err:
+ deinit_sensor_groups(hwmon_dev, sensor_groups);
+ return ret;
+}
+
+static int occ_create_hwmon_attrs(struct device *dev)
+{
+ struct occ_drv_data *drv_data = dev_get_drvdata(dev);
+ struct device *hwmon_dev = drv_data->hwmon_dev;
+ struct sensor_group *sensor_groups = drv_data->sensor_groups;
+ int i;
+ int sensor_num;
+ int ret;
+ struct occ_response *rsp;
+ enum sensor_t t;
+
+ rsp = &drv_data->occ_resp;
+
+ for (i = 0; i < ARRAY_SIZE(rsp->sensor_block_id); i++)
+ rsp->sensor_block_id[i] = -1;
+
+ /* read sensor data from occ. */
+ ret = occ_update_device(dev);
+ if (ret != 0) {
+ dev_dbg(dev, "ERROR: cannot get occ sensor data: %d\n", ret);
+ return ret;
+ }
+ if (!rsp->blocks)
+ return -1;
+
+ ret = device_create_file(hwmon_dev, &dev_attr_name);
+ if (ret)
+ goto error;
+
+ ret = device_create_file(hwmon_dev, &dev_attr_update_interval);
+ if (ret)
+ goto error;
+
+ if (rsp->sensor_block_id[caps] >= 0) {
+ /* user powercap: only for master OCC */
+ ret = device_create_file(hwmon_dev, &dev_attr_user_powercap);
+ if (ret)
+ goto error;
+ }
+
+ sensor_groups[freq].name = "freq";
+ sensor_groups[temp].name = "temp";
+ sensor_groups[power].name = "power";
+ sensor_groups[caps].name = "caps";
+
+ for (t = 0; t < MAX_OCC_SENSOR_TYPE; t++) {
+ if (rsp->sensor_block_id[t] < 0)
+ continue;
+
+ sensor_num =
+ rsp->blocks[rsp->sensor_block_id[t]].sensor_num;
+ if (t == caps)
+ ret = create_caps_sensor_group(hwmon_dev, sensor_num);
+ else
+ ret = create_sensor_group(hwmon_dev, t, sensor_num);
+ if (ret)
+ goto error;
+ }
+
+ return 0;
+error:
+ dev_err(dev, "ERROR: cannot create hwmon attributes\n");
+ occ_remove_hwmon_attrs(drv_data->hwmon_dev);
+ return ret;
+}
+
+static ssize_t show_occ_online(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct occ_drv_data *data = dev_get_drvdata(dev);
+
+ return snprintf(buf, PAGE_SIZE - 1, "%lu\n", data->occ_online);
+}
+
+static ssize_t set_occ_online(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct occ_drv_data *data = dev_get_drvdata(dev);
+ unsigned long val;
+ int err;
+
+ err = kstrtoul(buf, 10, &val);
+ if (err)
+ return err;
+
+ if (val == 1) {
+ if (data->occ_online == 1)
+ return count;
+
+ /* populate hwmon sysfs attr using sensor data */
+ dev_dbg(dev, "occ register hwmon @0x%x\n", data->client->addr);
+
+ data->hwmon_dev = hwmon_device_register(dev);
+ if (IS_ERR(data->hwmon_dev))
+ return PTR_ERR(data->hwmon_dev);
+
+ err = occ_create_hwmon_attrs(dev);
+ if (err) {
+ hwmon_device_unregister(data->hwmon_dev);
+ return err;
+ }
+ data->hwmon_dev->parent = dev;
+ } else if (val == 0) {
+ if (data->occ_online == 0)
+ return count;
+
+ occ_remove_hwmon_attrs(data->hwmon_dev);
+ hwmon_device_unregister(data->hwmon_dev);
+ data->hwmon_dev = NULL;
+ } else
+ return -EINVAL;
+
+ data->occ_online = val;
+ return count;
+}
+
+static DEVICE_ATTR(online, S_IWUSR | S_IRUGO,
+ show_occ_online, set_occ_online);
+
+static int occ_create_i2c_sysfs_attr(struct device *dev)
+{
+ /* create an i2c sysfs attribute, to indicate whether OCC is active */
+ return device_create_file(dev, &dev_attr_online);
+}
+
+
+/* device probe and removal */
+
+enum occ_type {
+ occ_id,
+};
+
+static int occ_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct occ_drv_data *data;
+
+ data = devm_kzalloc(dev, sizeof(struct occ_drv_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->client = client;
+ i2c_set_clientdata(client, data);
+ mutex_init(&data->update_lock);
+ data->update_interval = HZ;
+
+ occ_create_i2c_sysfs_attr(dev);
+
+ dev_info(dev, "occ i2c driver ready: i2c addr at 0x%x\n", client->addr);
+
+ return 0;
+}
+
+static int occ_remove(struct i2c_client *client)
+{
+ struct occ_drv_data *data = i2c_get_clientdata(client);
+
+ /* free allocated sensor memory */
+ deinit_occ_resp_buf(&data->occ_resp);
+
+ device_remove_file(&client->dev, &dev_attr_online);
+
+ if (!data->hwmon_dev)
+ return 0;
+
+ occ_remove_hwmon_attrs(data->hwmon_dev);
+ hwmon_device_unregister(data->hwmon_dev);
+ return 0;
+}
+
+/* used by old-style board info. */
+static const struct i2c_device_id occ_ids[] = {
+ { OCC_I2C_NAME, occ_id, },
+ { /* LIST END */ }
+};
+MODULE_DEVICE_TABLE(i2c, occ_ids);
+
+/* use by device table */
+static const struct of_device_id i2c_occ_of_match[] = {
+ {.compatible = "ibm,occ-i2c"},
+ {},
+};
+MODULE_DEVICE_TABLE(of, i2c_occ_of_match);
+
+/* i2c-core uses i2c-detect() to detect device in bellow address list.
+ * If exists, address will be assigned to client.
+ * It is also possible to read address from device table.
+ */
+static const unsigned short normal_i2c[] = {0x50, 0x51, I2C_CLIENT_END };
+
+static struct i2c_driver occ_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = OCC_I2C_NAME,
+ .pm = NULL,
+ .of_match_table = i2c_occ_of_match,
+ },
+ .probe = occ_probe,
+ .remove = occ_remove,
+ .id_table = occ_ids,
+ .address_list = normal_i2c,
+};
+
+module_i2c_driver(occ_driver);
+
+MODULE_AUTHOR("Li Yi <shliyi at cn.ibm.com>");
+MODULE_DESCRIPTION("BMC OCC hwmon driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hwmon/power8_occ_i2c.c b/drivers/hwmon/power8_occ_i2c.c
deleted file mode 100644
index 6de0e76..0000000
--- a/drivers/hwmon/power8_occ_i2c.c
+++ /dev/null
@@ -1,1254 +0,0 @@
-/*
- * OCC HWMON driver - read IBM Power8 On Chip Controller sensor data via
- * i2c.
- *
- * Copyright 2015 IBM Corp.
- *
- * 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.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/jiffies.h>
-#include <linux/i2c.h>
-#include <linux/hwmon.h>
-#include <linux/hwmon-sysfs.h>
-#include <linux/err.h>
-#include <linux/mutex.h>
-#include <linux/of.h>
-#include <linux/delay.h>
-#include <linux/kernel.h>
-#include <linux/device.h>
-
-#define OCC_I2C_ADDR 0x50
-#define OCC_I2C_NAME "occ-i2c"
-
-#define OCC_DATA_MAX 4096 /* 4KB at most */
-/* i2c read and write occ sensors */
-#define I2C_READ_ERROR 1
-#define I2C_WRITE_ERROR 2
-
-/* Defined in POWER8 Processor Registers Specification */
-/* To generate attn to OCC */
-#define ATTN_DATA 0x0006B035
-/* For BMC to read/write SRAM */
-#define OCB_ADDRESS 0x0006B070
-#define OCB_DATA 0x0006B075
-#define OCB_STATUS_CONTROL_AND 0x0006B072
-#define OCB_STATUS_CONTROL_OR 0x0006B073
-/* See definition in:
- * https://github.com/open-power/docs/blob/master/occ/OCC_OpenPwr_FW_Interfaces.pdf
- */
-#define OCC_COMMAND_ADDR 0xFFFF6000
-#define OCC_RESPONSE_ADDR 0xFFFF7000
-
-#define MAX_SENSOR_ATTR_LEN 32
-
-enum sensor_t {
- freq,
- temp,
- power,
- caps,
- MAX_OCC_SENSOR_TYPE
-};
-
-/* OCC sensor data format */
-struct occ_sensor {
- uint16_t sensor_id;
- uint16_t value;
-};
-
-struct power_sensor {
- uint16_t sensor_id;
- uint32_t update_tag;
- uint32_t accumulator;
- uint16_t value;
-};
-
-struct caps_sensor {
- uint16_t curr_powercap;
- uint16_t curr_powerreading;
- uint16_t norm_powercap;
- uint16_t max_powercap;
- uint16_t min_powercap;
- uint16_t user_powerlimit;
-};
-
-struct sensor_data_block {
- uint8_t sensor_type[4];
- uint8_t reserved0;
- uint8_t sensor_format;
- uint8_t sensor_length;
- uint8_t sensor_num;
- struct occ_sensor *sensor;
- struct power_sensor *power;
- struct caps_sensor *caps;
-};
-
-struct occ_poll_header {
- uint8_t status;
- uint8_t ext_status;
- uint8_t occs_present;
- uint8_t config;
- uint8_t occ_state;
- uint8_t reserved0;
- uint8_t reserved1;
- uint8_t error_log_id;
- uint32_t error_log_addr_start;
- uint16_t error_log_length;
- uint8_t reserved2;
- uint8_t reserved3;
- uint8_t occ_code_level[16];
- uint8_t sensor_eye_catcher[6];
- uint8_t sensor_block_num;
- uint8_t sensor_data_version;
-};
-
-struct occ_response {
- uint8_t sequence_num;
- uint8_t cmd_type;
- uint8_t rtn_status;
- uint16_t data_length;
- struct occ_poll_header header;
- struct sensor_data_block *blocks;
- uint16_t chk_sum;
- int sensor_block_id[MAX_OCC_SENSOR_TYPE];
-};
-
-struct sensor_attr_data {
- enum sensor_t type;
- uint32_t hwmon_index;
- uint32_t attr_id;
- char name[MAX_SENSOR_ATTR_LEN];
- struct device_attribute dev_attr;
-};
-
-struct sensor_group {
- char *name;
- struct sensor_attr_data *sattr;
- struct attribute_group group;
-};
-
-/* data private to each client */
-struct occ_drv_data {
- struct i2c_client *client;
- struct device *hwmon_dev;
- struct mutex update_lock;
- bool valid;
- unsigned long last_updated;
- /* Minimum timer interval for sampling In jiffies */
- unsigned long update_interval;
- unsigned long occ_online;
- uint16_t user_powercap;
- struct occ_response occ_resp;
- struct sensor_group sensor_groups[MAX_OCC_SENSOR_TYPE];
-};
-
-static void deinit_occ_resp_buf(struct occ_response *p)
-{
- int i;
-
- if (!p)
- return;
-
- if (!p->blocks)
- return;
-
- for (i = 0; i < p->header.sensor_block_num; i++) {
- kfree(p->blocks[i].sensor);
- kfree(p->blocks[i].power);
- kfree(p->blocks[i].caps);
- }
-
- kfree(p->blocks);
-
- memset(p, 0, sizeof(*p));
-
- for (i = 0; i < ARRAY_SIZE(p->sensor_block_id); i++)
- p->sensor_block_id[i] = -1;
-}
-
-static ssize_t occ_i2c_read(struct i2c_client *client, void *buf, size_t count)
-{
- WARN_ON(count > OCC_DATA_MAX);
-
- dev_dbg(&client->dev, "i2c_read: reading %zu bytes @0x%x.\n",
- count, client->addr);
- return i2c_master_recv(client, buf, count);
-}
-
-static ssize_t occ_i2c_write(struct i2c_client *client, const void *buf,
- size_t count)
-{
- WARN_ON(count > OCC_DATA_MAX);
-
- dev_dbg(&client->dev, "i2c_write: writing %zu bytes @0x%x.\n",
- count, client->addr);
- return i2c_master_send(client, buf, count);
-}
-
-/* read 8-byte value and put into data[offset] */
-static int occ_getscomb(struct i2c_client *client, uint32_t address,
- uint8_t *data, int offset)
-{
- uint32_t ret;
- char buf[8];
- int i;
-
- /* P8 i2c slave requires address to be shifted by 1 */
- address = address << 1;
-
- ret = occ_i2c_write(client, &address,
- sizeof(address));
-
- if (ret != sizeof(address))
- return -I2C_WRITE_ERROR;
-
- ret = occ_i2c_read(client, buf, sizeof(buf));
- if (ret != sizeof(buf))
- return -I2C_READ_ERROR;
-
- for (i = 0; i < 8; i++)
- data[offset + i] = buf[7 - i];
-
- return 0;
-}
-
-static int occ_putscom(struct i2c_client *client, uint32_t address,
- uint32_t data0, uint32_t data1)
-{
- uint32_t buf[3];
- uint32_t ret;
-
- /* P8 i2c slave requires address to be shifted by 1 */
- address = address << 1;
-
- buf[0] = address;
- buf[1] = data1;
- buf[2] = data0;
-
- ret = occ_i2c_write(client, buf, sizeof(buf));
- if (ret != sizeof(buf))
- return I2C_WRITE_ERROR;
-
- return 0;
-}
-
-static void *occ_get_sensor_by_type(struct occ_response *resp, enum sensor_t t)
-{
- void *sensor;
-
- if (!resp->blocks)
- return NULL;
-
- if (resp->sensor_block_id[t] == -1)
- return NULL;
-
- switch (t) {
- case temp:
- case freq:
- sensor = resp->blocks[resp->sensor_block_id[t]].sensor;
- break;
- case power:
- sensor = resp->blocks[resp->sensor_block_id[t]].power;
- break;
- case caps:
- sensor = resp->blocks[resp->sensor_block_id[t]].caps;
- break;
- default:
- sensor = NULL;
- }
-
- return sensor;
-}
-
-static int occ_renew_sensor(struct occ_response *resp, uint8_t sensor_length,
- uint8_t sensor_num, enum sensor_t t, int block)
-{
- void *sensor;
- int ret;
-
- sensor = occ_get_sensor_by_type(resp, t);
-
- /* empty sensor block, release older sensor data */
- if (sensor_num == 0 || sensor_length == 0) {
- kfree(sensor);
- return -1;
- }
-
- if (!sensor || sensor_num !=
- resp->blocks[resp->sensor_block_id[t]].sensor_num) {
- kfree(sensor);
- switch (t) {
- case temp:
- case freq:
- resp->blocks[block].sensor =
- kcalloc(sensor_num,
- sizeof(struct occ_sensor), GFP_KERNEL);
- if (!resp->blocks[block].sensor) {
- ret = -ENOMEM;
- goto err;
- }
- break;
- case power:
- resp->blocks[block].power =
- kcalloc(sensor_num,
- sizeof(struct power_sensor),
- GFP_KERNEL);
- if (!resp->blocks[block].power) {
- ret = -ENOMEM;
- goto err;
- }
- break;
- case caps:
- resp->blocks[block].caps =
- kcalloc(sensor_num,
- sizeof(struct caps_sensor), GFP_KERNEL);
- if (!resp->blocks[block].caps) {
- ret = -ENOMEM;
- goto err;
- }
- break;
- default:
- ret = -ENOMEM;
- goto err;
- }
- }
-
- return 0;
-err:
- deinit_occ_resp_buf(resp);
- return ret;
-}
-
-#define RESP_DATA_LENGTH 3
-#define RESP_HEADER_OFFSET 5
-#define SENSOR_STR_OFFSET 37
-#define SENSOR_BLOCK_NUM_OFFSET 43
-#define SENSOR_BLOCK_OFFSET 45
-
-static inline uint16_t get_occdata_length(uint8_t *data)
-{
- return be16_to_cpup((const __be16 *)&data[RESP_DATA_LENGTH]);
-}
-
-static int parse_occ_response(struct i2c_client *client,
- uint8_t *data, struct occ_response *resp)
-{
- int b;
- int s;
- int ret;
- int dnum = SENSOR_BLOCK_OFFSET;
- struct occ_sensor *f_sensor;
- struct occ_sensor *t_sensor;
- struct power_sensor *p_sensor;
- struct caps_sensor *c_sensor;
- uint8_t sensor_block_num;
- uint8_t sensor_type[4];
- uint8_t sensor_format;
- uint8_t sensor_length;
- uint8_t sensor_num;
-
- /* check if the data is valid */
- if (strncmp(&data[SENSOR_STR_OFFSET], "SENSOR", 6) != 0) {
- dev_dbg(&client->dev,
- "ERROR: no SENSOR String in response\n");
- ret = -1;
- goto err;
- }
-
- sensor_block_num = data[SENSOR_BLOCK_NUM_OFFSET];
- if (sensor_block_num == 0) {
- dev_dbg(&client->dev, "ERROR: SENSOR block num is 0\n");
- ret = -1;
- goto err;
- }
-
- /* if sensor block has changed, re-malloc */
- if (sensor_block_num != resp->header.sensor_block_num) {
- deinit_occ_resp_buf(resp);
- resp->blocks = kcalloc(sensor_block_num,
- sizeof(struct sensor_data_block), GFP_KERNEL);
- if (!resp->blocks)
- return -ENOMEM;
- }
-
- memcpy(&resp->header, &data[RESP_HEADER_OFFSET], sizeof(resp->header));
- resp->header.error_log_addr_start =
- be32_to_cpu(resp->header.error_log_addr_start);
- resp->header.error_log_length =
- be16_to_cpu(resp->header.error_log_length);
-
- dev_dbg(&client->dev, "Reading %d sensor blocks\n",
- resp->header.sensor_block_num);
- for (b = 0; b < sensor_block_num; b++) {
- /* 8-byte sensor block head */
- strncpy(sensor_type, &data[dnum], 4);
- sensor_format = data[dnum+5];
- sensor_length = data[dnum+6];
- sensor_num = data[dnum+7];
- dnum = dnum + 8;
-
- dev_dbg(&client->dev,
- "sensor block[%d]: type: %s, sensor_num: %d\n",
- b, sensor_type, sensor_num);
-
- if (strncmp(sensor_type, "FREQ", 4) == 0) {
- ret = occ_renew_sensor(resp, sensor_length,
- sensor_num, freq, b);
- if (ret)
- continue;
-
- resp->sensor_block_id[freq] = b;
- for (s = 0; s < sensor_num; s++) {
- f_sensor = &resp->blocks[b].sensor[s];
- f_sensor->sensor_id =
- be16_to_cpup((const __be16 *)
- &data[dnum]);
- f_sensor->value = be16_to_cpup((const __be16 *)
- &data[dnum+2]);
- dev_dbg(&client->dev,
- "sensor[%d]-[%d]: id: %u, value: %u\n",
- b, s, f_sensor->sensor_id,
- f_sensor->value);
- dnum = dnum + sensor_length;
- }
- } else if (strncmp(sensor_type, "TEMP", 4) == 0) {
- ret = occ_renew_sensor(resp, sensor_length,
- sensor_num, temp, b);
- if (ret)
- continue;
-
- resp->sensor_block_id[temp] = b;
- for (s = 0; s < sensor_num; s++) {
- t_sensor = &resp->blocks[b].sensor[s];
- t_sensor->sensor_id =
- be16_to_cpup((const __be16 *)
- &data[dnum]);
- t_sensor->value = be16_to_cpup((const __be16 *)
- &data[dnum+2]);
- dev_dbg(&client->dev,
- "sensor[%d]-[%d]: id: %u, value: %u\n",
- b, s, t_sensor->sensor_id,
- t_sensor->value);
- dnum = dnum + sensor_length;
- }
- } else if (strncmp(sensor_type, "POWR", 4) == 0) {
- ret = occ_renew_sensor(resp, sensor_length,
- sensor_num, power, b);
- if (ret)
- continue;
-
- resp->sensor_block_id[power] = b;
- for (s = 0; s < sensor_num; s++) {
- p_sensor = &resp->blocks[b].power[s];
- p_sensor->sensor_id =
- be16_to_cpup((const __be16 *)
- &data[dnum]);
- p_sensor->update_tag =
- be32_to_cpup((const __be32 *)
- &data[dnum+2]);
- p_sensor->accumulator =
- be32_to_cpup((const __be32 *)
- &data[dnum+6]);
- p_sensor->value = be16_to_cpup((const __be16 *)
- &data[dnum+10]);
-
- dev_dbg(&client->dev,
- "sensor[%d]-[%d]: id: %u, value: %u\n",
- b, s, p_sensor->sensor_id,
- p_sensor->value);
-
- dnum = dnum + sensor_length;
- }
- } else if (strncmp(sensor_type, "CAPS", 4) == 0) {
- ret = occ_renew_sensor(resp, sensor_length,
- sensor_num, caps, b);
- if (ret)
- continue;
-
- resp->sensor_block_id[caps] = b;
- for (s = 0; s < sensor_num; s++) {
- c_sensor = &resp->blocks[b].caps[s];
- c_sensor->curr_powercap =
- be16_to_cpup((const __be16 *)
- &data[dnum]);
- c_sensor->curr_powerreading =
- be16_to_cpup((const __be16 *)
- &data[dnum+2]);
- c_sensor->norm_powercap =
- be16_to_cpup((const __be16 *)
- &data[dnum+4]);
- c_sensor->max_powercap =
- be16_to_cpup((const __be16 *)
- &data[dnum+6]);
- c_sensor->min_powercap =
- be16_to_cpup((const __be16 *)
- &data[dnum+8]);
- c_sensor->user_powerlimit =
- be16_to_cpup((const __be16 *)
- &data[dnum+10]);
-
- dnum = dnum + sensor_length;
- dev_dbg(&client->dev, "CAPS sensor #%d:\n", s);
- dev_dbg(&client->dev, "curr_powercap is %x\n",
- c_sensor->curr_powercap);
- dev_dbg(&client->dev,
- "curr_powerreading is %x\n",
- c_sensor->curr_powerreading);
- dev_dbg(&client->dev, "norm_powercap is %x\n",
- c_sensor->norm_powercap);
- dev_dbg(&client->dev, "max_powercap is %x\n",
- c_sensor->max_powercap);
- dev_dbg(&client->dev, "min_powercap is %x\n",
- c_sensor->min_powercap);
- dev_dbg(&client->dev, "user_powerlimit is %x\n",
- c_sensor->user_powerlimit);
- }
-
- } else {
- dev_dbg(&client->dev,
- "ERROR: sensor type %s not supported\n",
- resp->blocks[b].sensor_type);
- ret = -1;
- goto err;
- }
-
- strncpy(resp->blocks[b].sensor_type, sensor_type, 4);
- resp->blocks[b].sensor_format = sensor_format;
- resp->blocks[b].sensor_length = sensor_length;
- resp->blocks[b].sensor_num = sensor_num;
- }
-
- return 0;
-err:
- deinit_occ_resp_buf(resp);
- return ret;
-}
-
-
-/* Refer to OCC interface document for OCC command format
- * https://github.com/open-power/docs/blob/master/occ/OCC_OpenPwr_FW_Interfaces.pdf
- */
-static uint8_t occ_send_cmd(struct i2c_client *client, uint8_t seq,
- uint8_t type, uint16_t length, uint8_t *data, uint8_t *resp)
-{
- uint32_t cmd1, cmd2;
- uint16_t checksum;
- int i;
-
- length = cpu_to_le16(length);
- cmd1 = (seq << 24) | (type << 16) | length;
- memcpy(&cmd2, data, length);
- cmd2 <<= ((4 - length) * 8);
-
- /* checksum: sum of every bytes of cmd1, cmd2 */
- checksum = 0;
- for (i = 0; i < 4; i++)
- checksum += (cmd1 >> (i * 8)) & 0xFF;
- for (i = 0; i < 4; i++)
- checksum += (cmd2 >> (i * 8)) & 0xFF;
- cmd2 |= checksum << ((2 - length) * 8);
-
- /* Init OCB */
- occ_putscom(client, OCB_STATUS_CONTROL_OR, 0x08000000, 0x00000000);
- occ_putscom(client, OCB_STATUS_CONTROL_AND, 0xFBFFFFFF, 0xFFFFFFFF);
-
- /* Send command */
- occ_putscom(client, OCB_ADDRESS, OCC_COMMAND_ADDR, 0x00000000);
- occ_putscom(client, OCB_ADDRESS, OCC_COMMAND_ADDR, 0x00000000);
- occ_putscom(client, OCB_DATA, cmd1, cmd2);
-
- /* Trigger attention */
- occ_putscom(client, ATTN_DATA, 0x01010000, 0x00000000);
-
- /* Get response data */
- occ_putscom(client, OCB_ADDRESS, OCC_RESPONSE_ADDR, 0x00000000);
- occ_getscomb(client, OCB_DATA, resp, 0);
-
- /* return status */
- return resp[2];
-}
-
-static int occ_get_all(struct i2c_client *client, struct occ_response *occ_resp)
-{
- uint8_t *occ_data;
- uint16_t num_bytes;
- int i;
- int ret;
- uint8_t poll_cmd_data;
-
- poll_cmd_data = 0x10;
-
- /*
- * TODO: fetch header, and then allocate the rest of the buffer based
- * on the header size. Assuming the OCC has a fixed sized header
- */
- occ_data = devm_kzalloc(&client->dev, OCC_DATA_MAX, GFP_KERNEL);
-
- ret = occ_send_cmd(client, 0, 0, 1, &poll_cmd_data, occ_data);
- if (ret) {
- dev_err(&client->dev, "ERROR: OCC Poll: 0x%x\n", ret);
- ret = -EINVAL;
- goto out;
- }
-
- num_bytes = get_occdata_length(occ_data);
-
- dev_dbg(&client->dev, "OCC data length: %d\n", num_bytes);
-
- if (num_bytes > OCC_DATA_MAX) {
- dev_dbg(&client->dev, "ERROR: OCC data length must be < 4KB\n");
- ret = -EINVAL;
- goto out;
- }
-
- if (num_bytes <= 0) {
- dev_dbg(&client->dev, "ERROR: OCC data length is zero\n");
- ret = -EINVAL;
- goto out;
- }
-
- /* read remaining data */
- for (i = 8; i < num_bytes + 8; i = i + 8)
- occ_getscomb(client, OCB_DATA, occ_data, i);
-
- ret = parse_occ_response(client, occ_data, occ_resp);
-
-out:
- devm_kfree(&client->dev, occ_data);
- return ret;
-}
-
-
-static int occ_update_device(struct device *dev)
-{
- struct occ_drv_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
- int ret = 0;
-
- mutex_lock(&data->update_lock);
-
- if (time_after(jiffies, data->last_updated + data->update_interval)
- || !data->valid) {
- data->valid = 1;
- ret = occ_get_all(client, &data->occ_resp);
- if (ret)
- data->valid = 0;
- data->last_updated = jiffies;
- }
- mutex_unlock(&data->update_lock);
-
- return ret;
-}
-
-
-static void *occ_get_sensor(struct device *hwmon_dev, enum sensor_t t)
-{
- struct device *dev = hwmon_dev->parent;
- struct occ_drv_data *data = dev_get_drvdata(dev);
- int ret;
-
- ret = occ_update_device(dev);
- if (ret != 0) {
- dev_dbg(dev, "ERROR: cannot get occ sensor data: %d\n", ret);
- return NULL;
- }
-
- return occ_get_sensor_by_type(&data->occ_resp, t);
-}
-
-static int occ_get_sensor_value(struct device *hwmon_dev, enum sensor_t t,
- int index)
-{
- void *sensor;
-
- if (t == caps)
- return -1;
-
- sensor = occ_get_sensor(hwmon_dev, t);
-
- if (!sensor)
- return -1;
-
- if (t == power)
- return ((struct power_sensor *)sensor)[index].value;
-
- return ((struct occ_sensor *)sensor)[index].value;
-}
-
-static int occ_get_sensor_id(struct device *hwmon_dev, enum sensor_t t,
- int index)
-{
- void *sensor;
-
- if (t == caps)
- return -1;
-
- sensor = occ_get_sensor(hwmon_dev, t);
-
- if (!sensor)
- return -1;
-
- if (t == power)
- return ((struct power_sensor *)sensor)[index].sensor_id;
-
- return ((struct occ_sensor *)sensor)[index].sensor_id;
-}
-
-/* sysfs attributes for occ hwmon device */
-
-static ssize_t show_input(struct device *hwmon_dev,
- struct device_attribute *da, char *buf)
-{
- struct sensor_attr_data *sdata = container_of(da,
- struct sensor_attr_data, dev_attr);
- int val;
-
- val = occ_get_sensor_value(hwmon_dev, sdata->type,
- sdata->hwmon_index - 1);
- if (sdata->type == temp)
- /* in millidegree Celsius */
- val *= 1000;
-
- return snprintf(buf, PAGE_SIZE - 1, "%d\n", val);
-}
-
-static ssize_t show_label(struct device *hwmon_dev,
- struct device_attribute *da, char *buf)
-{
- struct sensor_attr_data *sdata = container_of(da,
- struct sensor_attr_data, dev_attr);
- int val;
-
- val = occ_get_sensor_id(hwmon_dev, sdata->type,
- sdata->hwmon_index - 1);
-
- return snprintf(buf, PAGE_SIZE - 1, "%d\n", val);
-}
-
-static ssize_t show_caps(struct device *hwmon_dev,
- struct device_attribute *da, char *buf)
-{
- struct sensor_attr_data *sdata = container_of(da,
- struct sensor_attr_data, dev_attr);
- int nr = sdata->attr_id;
- int n = sdata->hwmon_index - 1;
- struct caps_sensor *sensor;
- int val;
-
- sensor = occ_get_sensor(hwmon_dev, caps);
- if (!sensor) {
- val = -1;
- return snprintf(buf, PAGE_SIZE - 1, "%d\n", val);
- }
-
- switch (nr) {
- case 0:
- val = sensor[n].curr_powercap;
- break;
- case 1:
- val = sensor[n].curr_powerreading;
- break;
- case 2:
- val = sensor[n].norm_powercap;
- break;
- case 3:
- val = sensor[n].max_powercap;
- break;
- case 4:
- val = sensor[n].min_powercap;
- break;
- case 5:
- val = sensor[n].user_powerlimit;
- break;
- default:
- val = -1;
- }
-
- return snprintf(buf, PAGE_SIZE - 1, "%d\n", val);
-}
-
-static ssize_t show_update_interval(struct device *hwmon_dev,
- struct device_attribute *attr, char *buf)
-{
- struct device *dev = hwmon_dev->parent;
- struct occ_drv_data *data = dev_get_drvdata(dev);
-
- return snprintf(buf, PAGE_SIZE - 1, "%u\n",
- jiffies_to_msecs(data->update_interval));
-}
-
-static ssize_t set_update_interval(struct device *hwmon_dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct device *dev = hwmon_dev->parent;
- struct occ_drv_data *data = dev_get_drvdata(dev);
- unsigned long val;
- int err;
-
- err = kstrtoul(buf, 10, &val);
- if (err)
- return err;
-
- data->update_interval = msecs_to_jiffies(val);
- return count;
-}
-static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,
- show_update_interval, set_update_interval);
-
-static ssize_t show_name(struct device *hwmon_dev,
- struct device_attribute *attr, char *buf)
-{
- return snprintf(buf, PAGE_SIZE - 1, "%s\n", OCC_I2C_NAME);
-}
-static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
-
-static ssize_t show_user_powercap(struct device *hwmon_dev,
- struct device_attribute *attr, char *buf)
-{
- struct device *dev = hwmon_dev->parent;
- struct occ_drv_data *data = dev_get_drvdata(dev);
-
- return snprintf(buf, PAGE_SIZE - 1, "%u\n", data->user_powercap);
-}
-
-
-static ssize_t set_user_powercap(struct device *hwmon_dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct device *dev = hwmon_dev->parent;
- struct occ_drv_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
- uint16_t val;
- uint8_t resp[8];
- int err;
-
- err = kstrtou16(buf, 10, &val);
- if (err)
- return err;
-
- dev_dbg(dev, "set user powercap to: %u\n", val);
- val = cpu_to_le16(val);
- err = occ_send_cmd(client, 0, 0x22, 2, (uint8_t *)&val, resp);
- if (err != 0) {
- dev_dbg(dev,
- "ERROR: Set User Powercap: wrong return status: %x\n",
- err);
- if (err == 0x13)
- dev_info(dev,
- "ERROR: set invalid powercap value: %x\n", val);
- return -EINVAL;
- }
- data->user_powercap = val;
- return count;
-}
-static DEVICE_ATTR(user_powercap, S_IWUSR | S_IRUGO,
- show_user_powercap, set_user_powercap);
-
-static void deinit_sensor_groups(struct device *hwmon_dev,
- struct sensor_group *sensor_groups)
-{
- int cnt;
-
- for (cnt = 0; cnt < MAX_OCC_SENSOR_TYPE; cnt++) {
- if (sensor_groups[cnt].group.attrs)
- devm_kfree(hwmon_dev, sensor_groups[cnt].group.attrs);
- if (sensor_groups[cnt].sattr)
- devm_kfree(hwmon_dev, sensor_groups[cnt].sattr);
- sensor_groups[cnt].group.attrs = NULL;
- sensor_groups[cnt].sattr = NULL;
- }
-}
-
-static void occ_remove_hwmon_attrs(struct device *hwmon_dev)
-{
- struct occ_drv_data *data = dev_get_drvdata(hwmon_dev->parent);
- struct sensor_group *sensor_groups = data->sensor_groups;
- int i;
-
- if (!hwmon_dev)
- return;
-
- device_remove_file(hwmon_dev, &dev_attr_update_interval);
- device_remove_file(hwmon_dev, &dev_attr_name);
- device_remove_file(hwmon_dev, &dev_attr_user_powercap);
-
- for (i = 0; i < MAX_OCC_SENSOR_TYPE; i++)
- sysfs_remove_group(&hwmon_dev->kobj, &sensor_groups[i].group);
-
- deinit_sensor_groups(hwmon_dev, sensor_groups);
-}
-
-static void sensor_attr_init(struct sensor_attr_data *sdata,
- char *sensor_group_name,
- char *attr_name,
- ssize_t (*show)(struct device *dev,
- struct device_attribute *attr,
- char *buf))
-{
- sysfs_attr_init(&sdata->dev_attr.attr);
-
- snprintf(sdata->name, MAX_SENSOR_ATTR_LEN, "%s%d_%s",
- sensor_group_name, sdata->hwmon_index, attr_name);
- sdata->dev_attr.attr.name = sdata->name;
- sdata->dev_attr.attr.mode = S_IRUGO;
- sdata->dev_attr.show = show;
-}
-
-/* create hwmon sensor sysfs attributes */
-static int create_sensor_group(struct device *hwmon_dev, enum sensor_t type,
- int sensor_num)
-{
- struct occ_drv_data *data = dev_get_drvdata(hwmon_dev->parent);
- struct sensor_group *sensor_groups = data->sensor_groups;
- struct sensor_attr_data *sdata;
- int ret;
- int cnt;
-
- /* each sensor has 'label' and 'input' attributes */
- sensor_groups[type].group.attrs = devm_kzalloc(hwmon_dev,
- sizeof(struct attribute *) *
- sensor_num * 2 + 1, GFP_KERNEL);
- if (!sensor_groups[type].group.attrs) {
- ret = -ENOMEM;
- goto err;
- }
-
- sensor_groups[type].sattr = devm_kzalloc(hwmon_dev,
- sizeof(struct sensor_attr_data) *
- sensor_num * 2, GFP_KERNEL);
- if (!sensor_groups[type].sattr) {
- ret = -ENOMEM;
- goto err;
- }
-
- for (cnt = 0; cnt < sensor_num; cnt++) {
- sdata = &sensor_groups[type].sattr[cnt];
- /* hwomon attributes index starts from 1 */
- sdata->hwmon_index = cnt + 1;
- sdata->type = type;
- sensor_attr_init(sdata, sensor_groups[type].name, "input",
- show_input);
- sensor_groups[type].group.attrs[cnt] = &sdata->dev_attr.attr;
-
- sdata = &sensor_groups[type].sattr[cnt + sensor_num];
- sdata->hwmon_index = cnt + 1;
- sdata->type = type;
- sensor_attr_init(sdata, sensor_groups[type].name, "label",
- show_label);
- sensor_groups[type].group.attrs[cnt + sensor_num] =
- &sdata->dev_attr.attr;
- }
-
- ret = sysfs_create_group(&hwmon_dev->kobj, &sensor_groups[type].group);
- if (ret)
- goto err;
-
- return ret;
-err:
- deinit_sensor_groups(hwmon_dev, sensor_groups);
- return ret;
-}
-
-static void caps_sensor_attr_init(struct sensor_attr_data *sdata,
- char *attr_name, uint32_t hwmon_index,
- uint32_t attr_id)
-{
- sdata->type = caps;
- sdata->hwmon_index = hwmon_index;
- sdata->attr_id = attr_id;
-
- /* FIXME, to be compatible with user space app, we do not
- * generate caps1_* attributes.
- */
- if (sdata->hwmon_index == 1)
- snprintf(sdata->name, MAX_SENSOR_ATTR_LEN, "%s_%s",
- "caps", attr_name);
- else
- snprintf(sdata->name, MAX_SENSOR_ATTR_LEN, "%s%d_%s",
- "caps", sdata->hwmon_index, attr_name);
-
- sysfs_attr_init(&sdata->dev_attr.attr);
- sdata->dev_attr.attr.name = sdata->name;
- sdata->dev_attr.attr.mode = S_IRUGO;
- sdata->dev_attr.show = show_caps;
-}
-
-static char *caps_sensor_name[] = {
- "curr_powercap",
- "curr_powerreading",
- "norm_powercap",
- "max_powercap",
- "min_powercap",
- "user_powerlimit",
-};
-
-static int create_caps_sensor_group(struct device *hwmon_dev, int sensor_num)
-{
- struct occ_drv_data *data = dev_get_drvdata(hwmon_dev->parent);
- struct sensor_group *sensor_groups = data->sensor_groups;
- int field_num = ARRAY_SIZE(caps_sensor_name);
- struct sensor_attr_data *sdata;
- int ret;
- int cnt;
- int i;
-
- sensor_groups[caps].group.attrs = devm_kzalloc(hwmon_dev,
- sizeof(struct attribute *) *
- sensor_num * field_num + 1,
- GFP_KERNEL);
- if (!sensor_groups[caps].group.attrs) {
- ret = -ENOMEM;
- goto err;
- }
-
- sensor_groups[caps].sattr = devm_kzalloc(hwmon_dev,
- sizeof(struct sensor_attr_data) *
- sensor_num * field_num,
- GFP_KERNEL);
- if (!sensor_groups[caps].sattr) {
- ret = -ENOMEM;
- goto err;
- }
-
- for (cnt = 0; cnt < sensor_num; cnt++) {
- for (i = 0; i < field_num; i++) {
- sdata = &sensor_groups[caps].sattr[cnt * field_num + i];
- caps_sensor_attr_init(sdata, caps_sensor_name[i],
- cnt + 1, i);
- sensor_groups[caps].group.attrs[cnt * field_num + i] =
- &sdata->dev_attr.attr;
- }
- }
-
- ret = sysfs_create_group(&hwmon_dev->kobj, &sensor_groups[caps].group);
- if (ret)
- goto err;
-
- return ret;
-err:
- deinit_sensor_groups(hwmon_dev, sensor_groups);
- return ret;
-}
-
-static int occ_create_hwmon_attrs(struct device *dev)
-{
- struct occ_drv_data *drv_data = dev_get_drvdata(dev);
- struct device *hwmon_dev = drv_data->hwmon_dev;
- struct sensor_group *sensor_groups = drv_data->sensor_groups;
- int i;
- int sensor_num;
- int ret;
- struct occ_response *rsp;
- enum sensor_t t;
-
- rsp = &drv_data->occ_resp;
-
- for (i = 0; i < ARRAY_SIZE(rsp->sensor_block_id); i++)
- rsp->sensor_block_id[i] = -1;
-
- /* read sensor data from occ. */
- ret = occ_update_device(dev);
- if (ret != 0) {
- dev_dbg(dev, "ERROR: cannot get occ sensor data: %d\n", ret);
- return ret;
- }
- if (!rsp->blocks)
- return -1;
-
- ret = device_create_file(hwmon_dev, &dev_attr_name);
- if (ret)
- goto error;
-
- ret = device_create_file(hwmon_dev, &dev_attr_update_interval);
- if (ret)
- goto error;
-
- if (rsp->sensor_block_id[caps] >= 0) {
- /* user powercap: only for master OCC */
- ret = device_create_file(hwmon_dev, &dev_attr_user_powercap);
- if (ret)
- goto error;
- }
-
- sensor_groups[freq].name = "freq";
- sensor_groups[temp].name = "temp";
- sensor_groups[power].name = "power";
- sensor_groups[caps].name = "caps";
-
- for (t = 0; t < MAX_OCC_SENSOR_TYPE; t++) {
- if (rsp->sensor_block_id[t] < 0)
- continue;
-
- sensor_num =
- rsp->blocks[rsp->sensor_block_id[t]].sensor_num;
- if (t == caps)
- ret = create_caps_sensor_group(hwmon_dev, sensor_num);
- else
- ret = create_sensor_group(hwmon_dev, t, sensor_num);
- if (ret)
- goto error;
- }
-
- return 0;
-error:
- dev_err(dev, "ERROR: cannot create hwmon attributes\n");
- occ_remove_hwmon_attrs(drv_data->hwmon_dev);
- return ret;
-}
-
-static ssize_t show_occ_online(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct occ_drv_data *data = dev_get_drvdata(dev);
-
- return snprintf(buf, PAGE_SIZE - 1, "%lu\n", data->occ_online);
-}
-
-static ssize_t set_occ_online(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct occ_drv_data *data = dev_get_drvdata(dev);
- unsigned long val;
- int err;
-
- err = kstrtoul(buf, 10, &val);
- if (err)
- return err;
-
- if (val == 1) {
- if (data->occ_online == 1)
- return count;
-
- /* populate hwmon sysfs attr using sensor data */
- dev_dbg(dev, "occ register hwmon @0x%x\n", data->client->addr);
-
- data->hwmon_dev = hwmon_device_register(dev);
- if (IS_ERR(data->hwmon_dev))
- return PTR_ERR(data->hwmon_dev);
-
- err = occ_create_hwmon_attrs(dev);
- if (err) {
- hwmon_device_unregister(data->hwmon_dev);
- return err;
- }
- data->hwmon_dev->parent = dev;
- } else if (val == 0) {
- if (data->occ_online == 0)
- return count;
-
- occ_remove_hwmon_attrs(data->hwmon_dev);
- hwmon_device_unregister(data->hwmon_dev);
- data->hwmon_dev = NULL;
- } else
- return -EINVAL;
-
- data->occ_online = val;
- return count;
-}
-
-static DEVICE_ATTR(online, S_IWUSR | S_IRUGO,
- show_occ_online, set_occ_online);
-
-static int occ_create_i2c_sysfs_attr(struct device *dev)
-{
- /* create an i2c sysfs attribute, to indicate whether OCC is active */
- return device_create_file(dev, &dev_attr_online);
-}
-
-
-/* device probe and removal */
-
-enum occ_type {
- occ_id,
-};
-
-static int occ_probe(struct i2c_client *client, const struct i2c_device_id *id)
-{
- struct device *dev = &client->dev;
- struct occ_drv_data *data;
-
- data = devm_kzalloc(dev, sizeof(struct occ_drv_data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- data->client = client;
- i2c_set_clientdata(client, data);
- mutex_init(&data->update_lock);
- data->update_interval = HZ;
-
- occ_create_i2c_sysfs_attr(dev);
-
- dev_info(dev, "occ i2c driver ready: i2c addr at 0x%x\n", client->addr);
-
- return 0;
-}
-
-static int occ_remove(struct i2c_client *client)
-{
- struct occ_drv_data *data = i2c_get_clientdata(client);
-
- /* free allocated sensor memory */
- deinit_occ_resp_buf(&data->occ_resp);
-
- device_remove_file(&client->dev, &dev_attr_online);
-
- if (!data->hwmon_dev)
- return 0;
-
- occ_remove_hwmon_attrs(data->hwmon_dev);
- hwmon_device_unregister(data->hwmon_dev);
- return 0;
-}
-
-/* used by old-style board info. */
-static const struct i2c_device_id occ_ids[] = {
- { OCC_I2C_NAME, occ_id, },
- { /* LIST END */ }
-};
-MODULE_DEVICE_TABLE(i2c, occ_ids);
-
-/* use by device table */
-static const struct of_device_id i2c_occ_of_match[] = {
- {.compatible = "ibm,occ-i2c"},
- {},
-};
-MODULE_DEVICE_TABLE(of, i2c_occ_of_match);
-
-/* i2c-core uses i2c-detect() to detect device in bellow address list.
- * If exists, address will be assigned to client.
- * It is also possible to read address from device table.
- */
-static const unsigned short normal_i2c[] = {0x50, 0x51, I2C_CLIENT_END };
-
-static struct i2c_driver occ_driver = {
- .class = I2C_CLASS_HWMON,
- .driver = {
- .name = OCC_I2C_NAME,
- .pm = NULL,
- .of_match_table = i2c_occ_of_match,
- },
- .probe = occ_probe,
- .remove = occ_remove,
- .id_table = occ_ids,
- .address_list = normal_i2c,
-};
-
-module_i2c_driver(occ_driver);
-
-MODULE_AUTHOR("Li Yi <shliyi at cn.ibm.com>");
-MODULE_DESCRIPTION("BMC OCC hwmon driver");
-MODULE_LICENSE("GPL");
--
1.9.1
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