408 lines
9.3 KiB
C
408 lines
9.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hardware monitoring driver for ZL6100 and compatibles
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*
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* Copyright (c) 2011 Ericsson AB.
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* Copyright (c) 2012 Guenter Roeck
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*/
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#include <linux/bitops.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/ktime.h>
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#include <linux/delay.h>
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#include "pmbus.h"
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enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105,
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zl9101, zl9117 };
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struct zl6100_data {
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int id;
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ktime_t access; /* chip access time */
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int delay; /* Delay between chip accesses in uS */
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struct pmbus_driver_info info;
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};
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#define to_zl6100_data(x) container_of(x, struct zl6100_data, info)
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#define ZL6100_MFR_CONFIG 0xd0
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#define ZL6100_DEVICE_ID 0xe4
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#define ZL6100_MFR_XTEMP_ENABLE BIT(7)
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#define MFR_VMON_OV_FAULT_LIMIT 0xf5
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#define MFR_VMON_UV_FAULT_LIMIT 0xf6
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#define MFR_READ_VMON 0xf7
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#define VMON_UV_WARNING BIT(5)
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#define VMON_OV_WARNING BIT(4)
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#define VMON_UV_FAULT BIT(1)
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#define VMON_OV_FAULT BIT(0)
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#define ZL6100_WAIT_TIME 1000 /* uS */
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static ushort delay = ZL6100_WAIT_TIME;
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module_param(delay, ushort, 0644);
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MODULE_PARM_DESC(delay, "Delay between chip accesses in uS");
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/* Convert linear sensor value to milli-units */
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static long zl6100_l2d(s16 l)
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{
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s16 exponent;
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s32 mantissa;
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long val;
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exponent = l >> 11;
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mantissa = ((s16)((l & 0x7ff) << 5)) >> 5;
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val = mantissa;
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/* scale result to milli-units */
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val = val * 1000L;
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if (exponent >= 0)
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val <<= exponent;
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else
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val >>= -exponent;
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return val;
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}
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#define MAX_MANTISSA (1023 * 1000)
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#define MIN_MANTISSA (511 * 1000)
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static u16 zl6100_d2l(long val)
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{
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s16 exponent = 0, mantissa;
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bool negative = false;
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/* simple case */
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if (val == 0)
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return 0;
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if (val < 0) {
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negative = true;
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val = -val;
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}
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/* Reduce large mantissa until it fits into 10 bit */
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while (val >= MAX_MANTISSA && exponent < 15) {
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exponent++;
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val >>= 1;
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}
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/* Increase small mantissa to improve precision */
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while (val < MIN_MANTISSA && exponent > -15) {
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exponent--;
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val <<= 1;
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}
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/* Convert mantissa from milli-units to units */
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mantissa = DIV_ROUND_CLOSEST(val, 1000);
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/* Ensure that resulting number is within range */
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if (mantissa > 0x3ff)
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mantissa = 0x3ff;
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/* restore sign */
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if (negative)
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mantissa = -mantissa;
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/* Convert to 5 bit exponent, 11 bit mantissa */
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return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
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}
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/* Some chips need a delay between accesses */
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static inline void zl6100_wait(const struct zl6100_data *data)
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{
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if (data->delay) {
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s64 delta = ktime_us_delta(ktime_get(), data->access);
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if (delta < data->delay)
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udelay(data->delay - delta);
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}
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}
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static int zl6100_read_word_data(struct i2c_client *client, int page,
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int phase, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct zl6100_data *data = to_zl6100_data(info);
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int ret, vreg;
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if (page > 0)
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return -ENXIO;
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if (data->id == zl2005) {
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/*
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* Limit register detection is not reliable on ZL2005.
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* Make sure registers are not erroneously detected.
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*/
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switch (reg) {
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case PMBUS_VOUT_OV_WARN_LIMIT:
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case PMBUS_VOUT_UV_WARN_LIMIT:
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case PMBUS_IOUT_OC_WARN_LIMIT:
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return -ENXIO;
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}
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}
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switch (reg) {
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case PMBUS_VIRT_READ_VMON:
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vreg = MFR_READ_VMON;
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break;
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case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
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case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
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vreg = MFR_VMON_OV_FAULT_LIMIT;
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break;
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case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
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case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
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vreg = MFR_VMON_UV_FAULT_LIMIT;
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break;
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default:
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if (reg >= PMBUS_VIRT_BASE)
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return -ENXIO;
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vreg = reg;
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break;
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}
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zl6100_wait(data);
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ret = pmbus_read_word_data(client, page, phase, vreg);
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data->access = ktime_get();
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if (ret < 0)
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return ret;
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switch (reg) {
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case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
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ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 9, 10));
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break;
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case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
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ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 11, 10));
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break;
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}
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return ret;
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}
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static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct zl6100_data *data = to_zl6100_data(info);
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int ret, status;
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if (page > 0)
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return -ENXIO;
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zl6100_wait(data);
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switch (reg) {
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case PMBUS_VIRT_STATUS_VMON:
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ret = pmbus_read_byte_data(client, 0,
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PMBUS_STATUS_MFR_SPECIFIC);
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if (ret < 0)
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break;
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status = 0;
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if (ret & VMON_UV_WARNING)
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status |= PB_VOLTAGE_UV_WARNING;
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if (ret & VMON_OV_WARNING)
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status |= PB_VOLTAGE_OV_WARNING;
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if (ret & VMON_UV_FAULT)
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status |= PB_VOLTAGE_UV_FAULT;
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if (ret & VMON_OV_FAULT)
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status |= PB_VOLTAGE_OV_FAULT;
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ret = status;
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break;
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default:
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ret = pmbus_read_byte_data(client, page, reg);
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break;
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}
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data->access = ktime_get();
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return ret;
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}
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static int zl6100_write_word_data(struct i2c_client *client, int page, int reg,
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u16 word)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct zl6100_data *data = to_zl6100_data(info);
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int ret, vreg;
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if (page > 0)
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return -ENXIO;
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switch (reg) {
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case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
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word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 9));
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vreg = MFR_VMON_OV_FAULT_LIMIT;
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pmbus_clear_cache(client);
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break;
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case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
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vreg = MFR_VMON_OV_FAULT_LIMIT;
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pmbus_clear_cache(client);
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break;
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case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
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word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 11));
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vreg = MFR_VMON_UV_FAULT_LIMIT;
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pmbus_clear_cache(client);
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break;
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case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
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vreg = MFR_VMON_UV_FAULT_LIMIT;
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pmbus_clear_cache(client);
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break;
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default:
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if (reg >= PMBUS_VIRT_BASE)
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return -ENXIO;
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vreg = reg;
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}
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zl6100_wait(data);
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ret = pmbus_write_word_data(client, page, vreg, word);
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data->access = ktime_get();
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return ret;
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}
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static int zl6100_write_byte(struct i2c_client *client, int page, u8 value)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct zl6100_data *data = to_zl6100_data(info);
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int ret;
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if (page > 0)
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return -ENXIO;
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zl6100_wait(data);
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ret = pmbus_write_byte(client, page, value);
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data->access = ktime_get();
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return ret;
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}
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static const struct i2c_device_id zl6100_id[] = {
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{"bmr450", zl2005},
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{"bmr451", zl2005},
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{"bmr462", zl2008},
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{"bmr463", zl2008},
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{"bmr464", zl2008},
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{"zl2004", zl2004},
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{"zl2005", zl2005},
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{"zl2006", zl2006},
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{"zl2008", zl2008},
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{"zl2105", zl2105},
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{"zl2106", zl2106},
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{"zl6100", zl6100},
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{"zl6105", zl6105},
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{"zl9101", zl9101},
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{"zl9117", zl9117},
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, zl6100_id);
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static int zl6100_probe(struct i2c_client *client)
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{
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int ret;
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struct zl6100_data *data;
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struct pmbus_driver_info *info;
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u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
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const struct i2c_device_id *mid;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_WORD_DATA
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| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
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return -ENODEV;
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ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID,
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device_id);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to read device ID\n");
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return ret;
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}
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device_id[ret] = '\0';
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dev_info(&client->dev, "Device ID %s\n", device_id);
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mid = NULL;
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for (mid = zl6100_id; mid->name[0]; mid++) {
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if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
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break;
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}
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if (!mid->name[0]) {
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dev_err(&client->dev, "Unsupported device\n");
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return -ENODEV;
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}
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if (strcmp(client->name, mid->name) != 0)
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dev_notice(&client->dev,
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"Device mismatch: Configured %s, detected %s\n",
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client->name, mid->name);
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data = devm_kzalloc(&client->dev, sizeof(struct zl6100_data),
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GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->id = mid->driver_data;
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/*
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* According to information from the chip vendor, all currently
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* supported chips are known to require a wait time between I2C
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* accesses.
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*/
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data->delay = delay;
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/*
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* Since there was a direct I2C device access above, wait before
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* accessing the chip again.
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*/
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data->access = ktime_get();
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zl6100_wait(data);
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info = &data->info;
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info->pages = 1;
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info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
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| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
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| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
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/*
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* ZL2004, ZL9101M, and ZL9117M support monitoring an extra voltage
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* (VMON for ZL2004, VDRV for ZL9101M and ZL9117M). Report it as vmon.
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*/
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if (data->id == zl2004 || data->id == zl9101 || data->id == zl9117)
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info->func[0] |= PMBUS_HAVE_VMON | PMBUS_HAVE_STATUS_VMON;
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ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG);
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if (ret < 0)
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return ret;
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if (ret & ZL6100_MFR_XTEMP_ENABLE)
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info->func[0] |= PMBUS_HAVE_TEMP2;
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data->access = ktime_get();
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zl6100_wait(data);
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info->read_word_data = zl6100_read_word_data;
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info->read_byte_data = zl6100_read_byte_data;
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info->write_word_data = zl6100_write_word_data;
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info->write_byte = zl6100_write_byte;
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return pmbus_do_probe(client, info);
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}
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static struct i2c_driver zl6100_driver = {
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.driver = {
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.name = "zl6100",
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},
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.probe_new = zl6100_probe,
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.remove = pmbus_do_remove,
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.id_table = zl6100_id,
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};
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module_i2c_driver(zl6100_driver);
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MODULE_AUTHOR("Guenter Roeck");
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MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles");
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MODULE_LICENSE("GPL");
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