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-rw-r--r--drivers/hwmon/pmbus/ltc2978.c934
1 files changed, 934 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c
new file mode 100644
index 000000000..6d2592731
--- /dev/null
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -0,0 +1,934 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Hardware monitoring driver for LTC2978 and compatible chips.
+ *
+ * Copyright (c) 2011 Ericsson AB.
+ * Copyright (c) 2013, 2014, 2015 Guenter Roeck
+ * Copyright (c) 2015 Linear Technology
+ * Copyright (c) 2018 Analog Devices Inc.
+ */
+
+#include <linux/delay.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/regulator/driver.h>
+#include "pmbus.h"
+
+enum chips {
+ /* Managers */
+ ltc2972, ltc2974, ltc2975, ltc2977, ltc2978, ltc2979, ltc2980,
+ /* Controllers */
+ ltc3880, ltc3882, ltc3883, ltc3884, ltc3886, ltc3887, ltc3889, ltc7880,
+ /* Modules */
+ ltm2987, ltm4664, ltm4675, ltm4676, ltm4677, ltm4678, ltm4680, ltm4686,
+ ltm4700,
+};
+
+/* Common for all chips */
+#define LTC2978_MFR_VOUT_PEAK 0xdd
+#define LTC2978_MFR_VIN_PEAK 0xde
+#define LTC2978_MFR_TEMPERATURE_PEAK 0xdf
+#define LTC2978_MFR_SPECIAL_ID 0xe7 /* Undocumented on LTC3882 */
+#define LTC2978_MFR_COMMON 0xef
+
+/* LTC2974, LTC2975, LCT2977, LTC2980, LTC2978, and LTM2987 */
+#define LTC2978_MFR_VOUT_MIN 0xfb
+#define LTC2978_MFR_VIN_MIN 0xfc
+#define LTC2978_MFR_TEMPERATURE_MIN 0xfd
+
+/* LTC2974, LTC2975 */
+#define LTC2974_MFR_IOUT_PEAK 0xd7
+#define LTC2974_MFR_IOUT_MIN 0xd8
+
+/* LTC3880, LTC3882, LTC3883, LTC3887, LTM4675, and LTM4676 */
+#define LTC3880_MFR_IOUT_PEAK 0xd7
+#define LTC3880_MFR_CLEAR_PEAKS 0xe3
+#define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4
+
+/* LTC3883, LTC3884, LTC3886, LTC3889 and LTC7880 only */
+#define LTC3883_MFR_IIN_PEAK 0xe1
+
+
+/* LTC2975 only */
+#define LTC2975_MFR_IIN_PEAK 0xc4
+#define LTC2975_MFR_IIN_MIN 0xc5
+#define LTC2975_MFR_PIN_PEAK 0xc6
+#define LTC2975_MFR_PIN_MIN 0xc7
+
+#define LTC2978_ID_MASK 0xfff0
+
+#define LTC2972_ID 0x0310
+#define LTC2974_ID 0x0210
+#define LTC2975_ID 0x0220
+#define LTC2977_ID 0x0130
+#define LTC2978_ID_REV1 0x0110 /* Early revision */
+#define LTC2978_ID_REV2 0x0120
+#define LTC2979_ID_A 0x8060
+#define LTC2979_ID_B 0x8070
+#define LTC2980_ID_A 0x8030 /* A/B for two die IDs */
+#define LTC2980_ID_B 0x8040
+#define LTC3880_ID 0x4020
+#define LTC3882_ID 0x4200
+#define LTC3882_ID_D1 0x4240 /* Dash 1 */
+#define LTC3883_ID 0x4300
+#define LTC3884_ID 0x4C00
+#define LTC3886_ID 0x4600
+#define LTC3887_ID 0x4700
+#define LTM2987_ID_A 0x8010 /* A/B for two die IDs */
+#define LTM2987_ID_B 0x8020
+#define LTC3889_ID 0x4900
+#define LTC7880_ID 0x49E0
+#define LTM4664_ID 0x4120
+#define LTM4675_ID 0x47a0
+#define LTM4676_ID_REV1 0x4400
+#define LTM4676_ID_REV2 0x4480
+#define LTM4676A_ID 0x47e0
+#define LTM4677_ID_REV1 0x47B0
+#define LTM4677_ID_REV2 0x47D0
+#define LTM4678_ID_REV1 0x4100
+#define LTM4678_ID_REV2 0x4110
+#define LTM4680_ID 0x4140
+#define LTM4686_ID 0x4770
+#define LTM4700_ID 0x4130
+
+#define LTC2972_NUM_PAGES 2
+#define LTC2974_NUM_PAGES 4
+#define LTC2978_NUM_PAGES 8
+#define LTC3880_NUM_PAGES 2
+#define LTC3883_NUM_PAGES 1
+
+#define LTC_POLL_TIMEOUT 100 /* in milli-seconds */
+
+#define LTC_NOT_BUSY BIT(6)
+#define LTC_NOT_PENDING BIT(5)
+
+/*
+ * LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which
+ * happens pretty much each time chip data is updated. Raw peak data therefore
+ * does not provide much value. To be able to provide useful peak data, keep an
+ * internal cache of measured peak data, which is only cleared if an explicit
+ * "clear peak" command is executed for the sensor in question.
+ */
+
+struct ltc2978_data {
+ enum chips id;
+ u16 vin_min, vin_max;
+ u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES];
+ u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES];
+ u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES];
+ u16 iin_min, iin_max;
+ u16 pin_min, pin_max;
+ u16 temp2_max;
+ struct pmbus_driver_info info;
+ u32 features;
+};
+#define to_ltc2978_data(x) container_of(x, struct ltc2978_data, info)
+
+#define FEAT_CLEAR_PEAKS BIT(0)
+#define FEAT_NEEDS_POLLING BIT(1)
+
+#define has_clear_peaks(d) ((d)->features & FEAT_CLEAR_PEAKS)
+#define needs_polling(d) ((d)->features & FEAT_NEEDS_POLLING)
+
+static int ltc_wait_ready(struct i2c_client *client)
+{
+ unsigned long timeout = jiffies + msecs_to_jiffies(LTC_POLL_TIMEOUT);
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct ltc2978_data *data = to_ltc2978_data(info);
+ int status;
+ u8 mask;
+
+ if (!needs_polling(data))
+ return 0;
+
+ /*
+ * LTC3883 does not support LTC_NOT_PENDING, even though
+ * the datasheet claims that it does.
+ */
+ mask = LTC_NOT_BUSY;
+ if (data->id != ltc3883)
+ mask |= LTC_NOT_PENDING;
+
+ do {
+ status = pmbus_read_byte_data(client, 0, LTC2978_MFR_COMMON);
+ if (status == -EBADMSG || status == -ENXIO) {
+ /* PEC error or NACK: chip may be busy, try again */
+ usleep_range(50, 100);
+ continue;
+ }
+ if (status < 0)
+ return status;
+
+ if ((status & mask) == mask)
+ return 0;
+
+ usleep_range(50, 100);
+ } while (time_before(jiffies, timeout));
+
+ return -ETIMEDOUT;
+}
+
+static int ltc_read_word_data(struct i2c_client *client, int page, int phase,
+ int reg)
+{
+ int ret;
+
+ ret = ltc_wait_ready(client);
+ if (ret < 0)
+ return ret;
+
+ return pmbus_read_word_data(client, page, 0xff, reg);
+}
+
+static int ltc_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+ int ret;
+
+ ret = ltc_wait_ready(client);
+ if (ret < 0)
+ return ret;
+
+ return pmbus_read_byte_data(client, page, reg);
+}
+
+static int ltc_write_byte_data(struct i2c_client *client, int page, int reg, u8 value)
+{
+ int ret;
+
+ ret = ltc_wait_ready(client);
+ if (ret < 0)
+ return ret;
+
+ return pmbus_write_byte_data(client, page, reg, value);
+}
+
+static int ltc_write_byte(struct i2c_client *client, int page, u8 byte)
+{
+ int ret;
+
+ ret = ltc_wait_ready(client);
+ if (ret < 0)
+ return ret;
+
+ return pmbus_write_byte(client, page, byte);
+}
+
+static inline int lin11_to_val(int data)
+{
+ s16 e = ((s16)data) >> 11;
+ s32 m = (((s16)(data << 5)) >> 5);
+
+ /*
+ * mantissa is 10 bit + sign, exponent adds up to 15 bit.
+ * Add 6 bit to exponent for maximum accuracy (10 + 15 + 6 = 31).
+ */
+ e += 6;
+ return (e < 0 ? m >> -e : m << e);
+}
+
+static int ltc_get_max(struct ltc2978_data *data, struct i2c_client *client,
+ int page, int reg, u16 *pmax)
+{
+ int ret;
+
+ ret = ltc_read_word_data(client, page, 0xff, reg);
+ if (ret >= 0) {
+ if (lin11_to_val(ret) > lin11_to_val(*pmax))
+ *pmax = ret;
+ ret = *pmax;
+ }
+ return ret;
+}
+
+static int ltc_get_min(struct ltc2978_data *data, struct i2c_client *client,
+ int page, int reg, u16 *pmin)
+{
+ int ret;
+
+ ret = ltc_read_word_data(client, page, 0xff, reg);
+ if (ret >= 0) {
+ if (lin11_to_val(ret) < lin11_to_val(*pmin))
+ *pmin = ret;
+ ret = *pmin;
+ }
+ return ret;
+}
+
+static int ltc2978_read_word_data_common(struct i2c_client *client, int page,
+ int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct ltc2978_data *data = to_ltc2978_data(info);
+ int ret;
+
+ switch (reg) {
+ case PMBUS_VIRT_READ_VIN_MAX:
+ ret = ltc_get_max(data, client, page, LTC2978_MFR_VIN_PEAK,
+ &data->vin_max);
+ break;
+ case PMBUS_VIRT_READ_VOUT_MAX:
+ ret = ltc_read_word_data(client, page, 0xff,
+ LTC2978_MFR_VOUT_PEAK);
+ if (ret >= 0) {
+ /*
+ * VOUT is 16 bit unsigned with fixed exponent,
+ * so we can compare it directly
+ */
+ if (ret > data->vout_max[page])
+ data->vout_max[page] = ret;
+ ret = data->vout_max[page];
+ }
+ break;
+ case PMBUS_VIRT_READ_TEMP_MAX:
+ ret = ltc_get_max(data, client, page,
+ LTC2978_MFR_TEMPERATURE_PEAK,
+ &data->temp_max[page]);
+ break;
+ case PMBUS_VIRT_RESET_VOUT_HISTORY:
+ case PMBUS_VIRT_RESET_VIN_HISTORY:
+ case PMBUS_VIRT_RESET_TEMP_HISTORY:
+ ret = 0;
+ break;
+ default:
+ ret = ltc_wait_ready(client);
+ if (ret < 0)
+ return ret;
+ ret = -ENODATA;
+ break;
+ }
+ return ret;
+}
+
+static int ltc2978_read_word_data(struct i2c_client *client, int page,
+ int phase, int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct ltc2978_data *data = to_ltc2978_data(info);
+ int ret;
+
+ switch (reg) {
+ case PMBUS_VIRT_READ_VIN_MIN:
+ ret = ltc_get_min(data, client, page, LTC2978_MFR_VIN_MIN,
+ &data->vin_min);
+ break;
+ case PMBUS_VIRT_READ_VOUT_MIN:
+ ret = ltc_read_word_data(client, page, phase,
+ LTC2978_MFR_VOUT_MIN);
+ if (ret >= 0) {
+ /*
+ * VOUT_MIN is known to not be supported on some lots
+ * of LTC2978 revision 1, and will return the maximum
+ * possible voltage if read. If VOUT_MAX is valid and
+ * lower than the reading of VOUT_MIN, use it instead.
+ */
+ if (data->vout_max[page] && ret > data->vout_max[page])
+ ret = data->vout_max[page];
+ if (ret < data->vout_min[page])
+ data->vout_min[page] = ret;
+ ret = data->vout_min[page];
+ }
+ break;
+ case PMBUS_VIRT_READ_TEMP_MIN:
+ ret = ltc_get_min(data, client, page,
+ LTC2978_MFR_TEMPERATURE_MIN,
+ &data->temp_min[page]);
+ break;
+ case PMBUS_VIRT_READ_IOUT_MAX:
+ case PMBUS_VIRT_RESET_IOUT_HISTORY:
+ case PMBUS_VIRT_READ_TEMP2_MAX:
+ case PMBUS_VIRT_RESET_TEMP2_HISTORY:
+ ret = -ENXIO;
+ break;
+ default:
+ ret = ltc2978_read_word_data_common(client, page, reg);
+ break;
+ }
+ return ret;
+}
+
+static int ltc2974_read_word_data(struct i2c_client *client, int page,
+ int phase, int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct ltc2978_data *data = to_ltc2978_data(info);
+ int ret;
+
+ switch (reg) {
+ case PMBUS_VIRT_READ_IOUT_MAX:
+ ret = ltc_get_max(data, client, page, LTC2974_MFR_IOUT_PEAK,
+ &data->iout_max[page]);
+ break;
+ case PMBUS_VIRT_READ_IOUT_MIN:
+ ret = ltc_get_min(data, client, page, LTC2974_MFR_IOUT_MIN,
+ &data->iout_min[page]);
+ break;
+ case PMBUS_VIRT_RESET_IOUT_HISTORY:
+ ret = 0;
+ break;
+ default:
+ ret = ltc2978_read_word_data(client, page, phase, reg);
+ break;
+ }
+ return ret;
+}
+
+static int ltc2975_read_word_data(struct i2c_client *client, int page,
+ int phase, int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct ltc2978_data *data = to_ltc2978_data(info);
+ int ret;
+
+ switch (reg) {
+ case PMBUS_VIRT_READ_IIN_MAX:
+ ret = ltc_get_max(data, client, page, LTC2975_MFR_IIN_PEAK,
+ &data->iin_max);
+ break;
+ case PMBUS_VIRT_READ_IIN_MIN:
+ ret = ltc_get_min(data, client, page, LTC2975_MFR_IIN_MIN,
+ &data->iin_min);
+ break;
+ case PMBUS_VIRT_READ_PIN_MAX:
+ ret = ltc_get_max(data, client, page, LTC2975_MFR_PIN_PEAK,
+ &data->pin_max);
+ break;
+ case PMBUS_VIRT_READ_PIN_MIN:
+ ret = ltc_get_min(data, client, page, LTC2975_MFR_PIN_MIN,
+ &data->pin_min);
+ break;
+ case PMBUS_VIRT_RESET_IIN_HISTORY:
+ case PMBUS_VIRT_RESET_PIN_HISTORY:
+ ret = 0;
+ break;
+ default:
+ ret = ltc2978_read_word_data(client, page, phase, reg);
+ break;
+ }
+ return ret;
+}
+
+static int ltc3880_read_word_data(struct i2c_client *client, int page,
+ int phase, int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct ltc2978_data *data = to_ltc2978_data(info);
+ int ret;
+
+ switch (reg) {
+ case PMBUS_VIRT_READ_IOUT_MAX:
+ ret = ltc_get_max(data, client, page, LTC3880_MFR_IOUT_PEAK,
+ &data->iout_max[page]);
+ break;
+ case PMBUS_VIRT_READ_TEMP2_MAX:
+ ret = ltc_get_max(data, client, page,
+ LTC3880_MFR_TEMPERATURE2_PEAK,
+ &data->temp2_max);
+ break;
+ case PMBUS_VIRT_READ_VIN_MIN:
+ case PMBUS_VIRT_READ_VOUT_MIN:
+ case PMBUS_VIRT_READ_TEMP_MIN:
+ ret = -ENXIO;
+ break;
+ case PMBUS_VIRT_RESET_IOUT_HISTORY:
+ case PMBUS_VIRT_RESET_TEMP2_HISTORY:
+ ret = 0;
+ break;
+ default:
+ ret = ltc2978_read_word_data_common(client, page, reg);
+ break;
+ }
+ return ret;
+}
+
+static int ltc3883_read_word_data(struct i2c_client *client, int page,
+ int phase, int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct ltc2978_data *data = to_ltc2978_data(info);
+ int ret;
+
+ switch (reg) {
+ case PMBUS_VIRT_READ_IIN_MAX:
+ ret = ltc_get_max(data, client, page, LTC3883_MFR_IIN_PEAK,
+ &data->iin_max);
+ break;
+ case PMBUS_VIRT_RESET_IIN_HISTORY:
+ ret = 0;
+ break;
+ default:
+ ret = ltc3880_read_word_data(client, page, phase, reg);
+ break;
+ }
+ return ret;
+}
+
+static int ltc2978_clear_peaks(struct ltc2978_data *data,
+ struct i2c_client *client, int page)
+{
+ int ret;
+
+ if (has_clear_peaks(data))
+ ret = ltc_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS);
+ else
+ ret = ltc_write_byte(client, page, PMBUS_CLEAR_FAULTS);
+
+ return ret;
+}
+
+static int ltc2978_write_word_data(struct i2c_client *client, int page,
+ int reg, u16 word)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct ltc2978_data *data = to_ltc2978_data(info);
+ int ret;
+
+ switch (reg) {
+ case PMBUS_VIRT_RESET_IIN_HISTORY:
+ data->iin_max = 0x7c00;
+ data->iin_min = 0x7bff;
+ ret = ltc2978_clear_peaks(data, client, 0);
+ break;
+ case PMBUS_VIRT_RESET_PIN_HISTORY:
+ data->pin_max = 0x7c00;
+ data->pin_min = 0x7bff;
+ ret = ltc2978_clear_peaks(data, client, 0);
+ break;
+ case PMBUS_VIRT_RESET_IOUT_HISTORY:
+ data->iout_max[page] = 0x7c00;
+ data->iout_min[page] = 0xfbff;
+ ret = ltc2978_clear_peaks(data, client, page);
+ break;
+ case PMBUS_VIRT_RESET_TEMP2_HISTORY:
+ data->temp2_max = 0x7c00;
+ ret = ltc2978_clear_peaks(data, client, page);
+ break;
+ case PMBUS_VIRT_RESET_VOUT_HISTORY:
+ data->vout_min[page] = 0xffff;
+ data->vout_max[page] = 0;
+ ret = ltc2978_clear_peaks(data, client, page);
+ break;
+ case PMBUS_VIRT_RESET_VIN_HISTORY:
+ data->vin_min = 0x7bff;
+ data->vin_max = 0x7c00;
+ ret = ltc2978_clear_peaks(data, client, page);
+ break;
+ case PMBUS_VIRT_RESET_TEMP_HISTORY:
+ data->temp_min[page] = 0x7bff;
+ data->temp_max[page] = 0x7c00;
+ ret = ltc2978_clear_peaks(data, client, page);
+ break;
+ default:
+ ret = ltc_wait_ready(client);
+ if (ret < 0)
+ return ret;
+ ret = -ENODATA;
+ break;
+ }
+ return ret;
+}
+
+static const struct i2c_device_id ltc2978_id[] = {
+ {"ltc2972", ltc2972},
+ {"ltc2974", ltc2974},
+ {"ltc2975", ltc2975},
+ {"ltc2977", ltc2977},
+ {"ltc2978", ltc2978},
+ {"ltc2979", ltc2979},
+ {"ltc2980", ltc2980},
+ {"ltc3880", ltc3880},
+ {"ltc3882", ltc3882},
+ {"ltc3883", ltc3883},
+ {"ltc3884", ltc3884},
+ {"ltc3886", ltc3886},
+ {"ltc3887", ltc3887},
+ {"ltc3889", ltc3889},
+ {"ltc7880", ltc7880},
+ {"ltm2987", ltm2987},
+ {"ltm4664", ltm4664},
+ {"ltm4675", ltm4675},
+ {"ltm4676", ltm4676},
+ {"ltm4677", ltm4677},
+ {"ltm4678", ltm4678},
+ {"ltm4680", ltm4680},
+ {"ltm4686", ltm4686},
+ {"ltm4700", ltm4700},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, ltc2978_id);
+
+#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
+#define LTC2978_ADC_RES 0xFFFF
+#define LTC2978_N_ADC 122
+#define LTC2978_MAX_UV (LTC2978_ADC_RES * LTC2978_N_ADC)
+#define LTC2978_UV_STEP 1000
+#define LTC2978_N_VOLTAGES ((LTC2978_MAX_UV / LTC2978_UV_STEP) + 1)
+
+static const struct regulator_desc ltc2978_reg_desc[] = {
+ PMBUS_REGULATOR_STEP("vout", 0, LTC2978_N_VOLTAGES, LTC2978_UV_STEP),
+ PMBUS_REGULATOR_STEP("vout", 1, LTC2978_N_VOLTAGES, LTC2978_UV_STEP),
+ PMBUS_REGULATOR_STEP("vout", 2, LTC2978_N_VOLTAGES, LTC2978_UV_STEP),
+ PMBUS_REGULATOR_STEP("vout", 3, LTC2978_N_VOLTAGES, LTC2978_UV_STEP),
+ PMBUS_REGULATOR_STEP("vout", 4, LTC2978_N_VOLTAGES, LTC2978_UV_STEP),
+ PMBUS_REGULATOR_STEP("vout", 5, LTC2978_N_VOLTAGES, LTC2978_UV_STEP),
+ PMBUS_REGULATOR_STEP("vout", 6, LTC2978_N_VOLTAGES, LTC2978_UV_STEP),
+ PMBUS_REGULATOR_STEP("vout", 7, LTC2978_N_VOLTAGES, LTC2978_UV_STEP),
+};
+
+static const struct regulator_desc ltc2978_reg_desc_default[] = {
+ PMBUS_REGULATOR("vout", 0),
+ PMBUS_REGULATOR("vout", 1),
+ PMBUS_REGULATOR("vout", 2),
+ PMBUS_REGULATOR("vout", 3),
+ PMBUS_REGULATOR("vout", 4),
+ PMBUS_REGULATOR("vout", 5),
+ PMBUS_REGULATOR("vout", 6),
+ PMBUS_REGULATOR("vout", 7),
+};
+#endif /* CONFIG_SENSORS_LTC2978_REGULATOR */
+
+static int ltc2978_get_id(struct i2c_client *client)
+{
+ int chip_id;
+
+ chip_id = i2c_smbus_read_word_data(client, LTC2978_MFR_SPECIAL_ID);
+ if (chip_id < 0) {
+ const struct i2c_device_id *id;
+ u8 buf[I2C_SMBUS_BLOCK_MAX];
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_READ_BLOCK_DATA))
+ return -ENODEV;
+
+ ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
+ if (ret < 0)
+ return ret;
+ if (ret < 3 || strncmp(buf, "LTC", 3))
+ return -ENODEV;
+
+ ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
+ if (ret < 0)
+ return ret;
+ for (id = &ltc2978_id[0]; strlen(id->name); id++) {
+ if (!strncasecmp(id->name, buf, strlen(id->name)))
+ return (int)id->driver_data;
+ }
+ return -ENODEV;
+ }
+
+ chip_id &= LTC2978_ID_MASK;
+
+ if (chip_id == LTC2972_ID)
+ return ltc2972;
+ else if (chip_id == LTC2974_ID)
+ return ltc2974;
+ else if (chip_id == LTC2975_ID)
+ return ltc2975;
+ else if (chip_id == LTC2977_ID)
+ return ltc2977;
+ else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2)
+ return ltc2978;
+ else if (chip_id == LTC2979_ID_A || chip_id == LTC2979_ID_B)
+ return ltc2979;
+ else if (chip_id == LTC2980_ID_A || chip_id == LTC2980_ID_B)
+ return ltc2980;
+ else if (chip_id == LTC3880_ID)
+ return ltc3880;
+ else if (chip_id == LTC3882_ID || chip_id == LTC3882_ID_D1)
+ return ltc3882;
+ else if (chip_id == LTC3883_ID)
+ return ltc3883;
+ else if (chip_id == LTC3884_ID)
+ return ltc3884;
+ else if (chip_id == LTC3886_ID)
+ return ltc3886;
+ else if (chip_id == LTC3887_ID)
+ return ltc3887;
+ else if (chip_id == LTC3889_ID)
+ return ltc3889;
+ else if (chip_id == LTC7880_ID)
+ return ltc7880;
+ else if (chip_id == LTM2987_ID_A || chip_id == LTM2987_ID_B)
+ return ltm2987;
+ else if (chip_id == LTM4664_ID)
+ return ltm4664;
+ else if (chip_id == LTM4675_ID)
+ return ltm4675;
+ else if (chip_id == LTM4676_ID_REV1 || chip_id == LTM4676_ID_REV2 ||
+ chip_id == LTM4676A_ID)
+ return ltm4676;
+ else if (chip_id == LTM4677_ID_REV1 || chip_id == LTM4677_ID_REV2)
+ return ltm4677;
+ else if (chip_id == LTM4678_ID_REV1 || chip_id == LTM4678_ID_REV2)
+ return ltm4678;
+ else if (chip_id == LTM4680_ID)
+ return ltm4680;
+ else if (chip_id == LTM4686_ID)
+ return ltm4686;
+ else if (chip_id == LTM4700_ID)
+ return ltm4700;
+
+ dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id);
+ return -ENODEV;
+}
+
+static int ltc2978_probe(struct i2c_client *client)
+{
+ int i, chip_id;
+ struct ltc2978_data *data;
+ struct pmbus_driver_info *info;
+ const struct i2c_device_id *id;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_READ_WORD_DATA))
+ return -ENODEV;
+
+ data = devm_kzalloc(&client->dev, sizeof(struct ltc2978_data),
+ GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ chip_id = ltc2978_get_id(client);
+ if (chip_id < 0)
+ return chip_id;
+
+ data->id = chip_id;
+ id = i2c_match_id(ltc2978_id, client);
+ if (data->id != id->driver_data)
+ dev_warn(&client->dev,
+ "Device mismatch: Configured %s (%d), detected %d\n",
+ id->name,
+ (int) id->driver_data,
+ chip_id);
+
+ info = &data->info;
+ info->write_word_data = ltc2978_write_word_data;
+ info->write_byte = ltc_write_byte;
+ info->write_byte_data = ltc_write_byte_data;
+ info->read_word_data = ltc_read_word_data;
+ info->read_byte_data = ltc_read_byte_data;
+
+ data->vin_min = 0x7bff;
+ data->vin_max = 0x7c00;
+ for (i = 0; i < ARRAY_SIZE(data->vout_min); i++)
+ data->vout_min[i] = 0xffff;
+ for (i = 0; i < ARRAY_SIZE(data->iout_min); i++)
+ data->iout_min[i] = 0xfbff;
+ for (i = 0; i < ARRAY_SIZE(data->iout_max); i++)
+ data->iout_max[i] = 0x7c00;
+ for (i = 0; i < ARRAY_SIZE(data->temp_min); i++)
+ data->temp_min[i] = 0x7bff;
+ for (i = 0; i < ARRAY_SIZE(data->temp_max); i++)
+ data->temp_max[i] = 0x7c00;
+ data->temp2_max = 0x7c00;
+
+ switch (data->id) {
+ case ltc2972:
+ info->read_word_data = ltc2975_read_word_data;
+ info->pages = LTC2972_NUM_PAGES;
+ info->func[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
+ | PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
+ | PMBUS_HAVE_TEMP2;
+ for (i = 0; i < info->pages; i++) {
+ info->func[i] |= PMBUS_HAVE_VOUT
+ | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT
+ | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
+ }
+ break;
+ case ltc2974:
+ info->read_word_data = ltc2974_read_word_data;
+ info->pages = LTC2974_NUM_PAGES;
+ info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
+ | PMBUS_HAVE_TEMP2;
+ for (i = 0; i < info->pages; i++) {
+ info->func[i] |= PMBUS_HAVE_VOUT
+ | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT
+ | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
+ }
+ break;
+ case ltc2975:
+ info->read_word_data = ltc2975_read_word_data;
+ info->pages = LTC2974_NUM_PAGES;
+ info->func[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
+ | PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
+ | PMBUS_HAVE_TEMP2;
+ for (i = 0; i < info->pages; i++) {
+ info->func[i] |= PMBUS_HAVE_VOUT
+ | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT
+ | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
+ }
+ break;
+
+ case ltc2977:
+ case ltc2978:
+ case ltc2979:
+ case ltc2980:
+ case ltm2987:
+ info->read_word_data = ltc2978_read_word_data;
+ info->pages = LTC2978_NUM_PAGES;
+ info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
+ | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
+ for (i = 1; i < LTC2978_NUM_PAGES; i++) {
+ info->func[i] = PMBUS_HAVE_VOUT
+ | PMBUS_HAVE_STATUS_VOUT;
+ }
+ break;
+ case ltc3880:
+ case ltc3887:
+ case ltm4675:
+ case ltm4676:
+ case ltm4677:
+ case ltm4686:
+ data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
+ info->read_word_data = ltc3880_read_word_data;
+ info->pages = LTC3880_NUM_PAGES;
+ info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
+ | PMBUS_HAVE_STATUS_INPUT
+ | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+ | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
+ | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
+ info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+ | PMBUS_HAVE_POUT
+ | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
+ break;
+ case ltc3882:
+ data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
+ info->read_word_data = ltc3880_read_word_data;
+ info->pages = LTC3880_NUM_PAGES;
+ info->func[0] = PMBUS_HAVE_VIN
+ | PMBUS_HAVE_STATUS_INPUT
+ | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+ | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
+ | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
+ info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+ | PMBUS_HAVE_POUT
+ | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
+ break;
+ case ltc3883:
+ data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
+ info->read_word_data = ltc3883_read_word_data;
+ info->pages = LTC3883_NUM_PAGES;
+ info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
+ | PMBUS_HAVE_STATUS_INPUT
+ | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+ | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
+ | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
+ break;
+ case ltc3884:
+ case ltc3886:
+ case ltc3889:
+ case ltc7880:
+ case ltm4664:
+ case ltm4678:
+ case ltm4680:
+ case ltm4700:
+ data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
+ info->read_word_data = ltc3883_read_word_data;
+ info->pages = LTC3880_NUM_PAGES;
+ info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
+ | PMBUS_HAVE_STATUS_INPUT
+ | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+ | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
+ | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
+ info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+ | PMBUS_HAVE_POUT
+ | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
+ break;
+ default:
+ return -ENODEV;
+ }
+
+#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
+ info->num_regulators = info->pages;
+ switch (data->id) {
+ case ltc2972:
+ case ltc2974:
+ case ltc2975:
+ case ltc2977:
+ case ltc2978:
+ case ltc2979:
+ case ltc2980:
+ case ltm2987:
+ info->reg_desc = ltc2978_reg_desc;
+ if (info->num_regulators > ARRAY_SIZE(ltc2978_reg_desc)) {
+ dev_warn(&client->dev, "num_regulators too large!");
+ info->num_regulators = ARRAY_SIZE(ltc2978_reg_desc);
+ }
+ break;
+ default:
+ info->reg_desc = ltc2978_reg_desc_default;
+ if (info->num_regulators > ARRAY_SIZE(ltc2978_reg_desc_default)) {
+ dev_warn(&client->dev, "num_regulators too large!");
+ info->num_regulators =
+ ARRAY_SIZE(ltc2978_reg_desc_default);
+ }
+ break;
+ }
+#endif
+
+ return pmbus_do_probe(client, info);
+}
+
+
+#ifdef CONFIG_OF
+static const struct of_device_id ltc2978_of_match[] = {
+ { .compatible = "lltc,ltc2972" },
+ { .compatible = "lltc,ltc2974" },
+ { .compatible = "lltc,ltc2975" },
+ { .compatible = "lltc,ltc2977" },
+ { .compatible = "lltc,ltc2978" },
+ { .compatible = "lltc,ltc2979" },
+ { .compatible = "lltc,ltc2980" },
+ { .compatible = "lltc,ltc3880" },
+ { .compatible = "lltc,ltc3882" },
+ { .compatible = "lltc,ltc3883" },
+ { .compatible = "lltc,ltc3884" },
+ { .compatible = "lltc,ltc3886" },
+ { .compatible = "lltc,ltc3887" },
+ { .compatible = "lltc,ltc3889" },
+ { .compatible = "lltc,ltc7880" },
+ { .compatible = "lltc,ltm2987" },
+ { .compatible = "lltc,ltm4664" },
+ { .compatible = "lltc,ltm4675" },
+ { .compatible = "lltc,ltm4676" },
+ { .compatible = "lltc,ltm4677" },
+ { .compatible = "lltc,ltm4678" },
+ { .compatible = "lltc,ltm4680" },
+ { .compatible = "lltc,ltm4686" },
+ { .compatible = "lltc,ltm4700" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ltc2978_of_match);
+#endif
+
+static struct i2c_driver ltc2978_driver = {
+ .driver = {
+ .name = "ltc2978",
+ .of_match_table = of_match_ptr(ltc2978_of_match),
+ },
+ .probe_new = ltc2978_probe,
+ .id_table = ltc2978_id,
+};
+
+module_i2c_driver(ltc2978_driver);
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for LTC2978 and compatible chips");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-09 13:32:16 +0000