789 lines
22 KiB
C
789 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for MAX20710, MAX20730, MAX20734, and MAX20743 Integrated,
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* Step-Down Switching Regulators
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*
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* Copyright 2019 Google LLC.
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* Copyright 2020 Maxim Integrated
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*/
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#include <linux/bits.h>
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#include <linux/debugfs.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of_device.h>
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#include <linux/pmbus.h>
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#include <linux/util_macros.h>
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#include "pmbus.h"
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enum chips {
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max20710,
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max20730,
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max20734,
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max20743
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};
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enum {
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MAX20730_DEBUGFS_VOUT_MIN = 0,
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MAX20730_DEBUGFS_FREQUENCY,
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MAX20730_DEBUGFS_PG_DELAY,
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MAX20730_DEBUGFS_INTERNAL_GAIN,
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MAX20730_DEBUGFS_BOOT_VOLTAGE,
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MAX20730_DEBUGFS_OUT_V_RAMP_RATE,
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MAX20730_DEBUGFS_OC_PROTECT_MODE,
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MAX20730_DEBUGFS_SS_TIMING,
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MAX20730_DEBUGFS_IMAX,
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MAX20730_DEBUGFS_OPERATION,
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MAX20730_DEBUGFS_ON_OFF_CONFIG,
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MAX20730_DEBUGFS_SMBALERT_MASK,
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MAX20730_DEBUGFS_VOUT_MODE,
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MAX20730_DEBUGFS_VOUT_COMMAND,
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MAX20730_DEBUGFS_VOUT_MAX,
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MAX20730_DEBUGFS_NUM_ENTRIES
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};
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struct max20730_data {
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enum chips id;
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struct pmbus_driver_info info;
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struct mutex lock; /* Used to protect against parallel writes */
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u16 mfr_devset1;
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u16 mfr_devset2;
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u16 mfr_voutmin;
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u32 vout_voltage_divider[2];
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};
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#define to_max20730_data(x) container_of(x, struct max20730_data, info)
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#define VOLT_FROM_REG(val) DIV_ROUND_CLOSEST((val), 1 << 9)
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#define PMBUS_SMB_ALERT_MASK 0x1B
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#define MAX20730_MFR_VOUT_MIN 0xd1
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#define MAX20730_MFR_DEVSET1 0xd2
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#define MAX20730_MFR_DEVSET2 0xd3
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#define MAX20730_MFR_VOUT_MIN_MASK GENMASK(9, 0)
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#define MAX20730_MFR_VOUT_MIN_BIT_POS 0
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#define MAX20730_MFR_DEVSET1_RGAIN_MASK (BIT(13) | BIT(14))
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#define MAX20730_MFR_DEVSET1_OTP_MASK (BIT(11) | BIT(12))
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#define MAX20730_MFR_DEVSET1_VBOOT_MASK (BIT(8) | BIT(9))
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#define MAX20730_MFR_DEVSET1_OCP_MASK (BIT(5) | BIT(6))
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#define MAX20730_MFR_DEVSET1_FSW_MASK GENMASK(4, 2)
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#define MAX20730_MFR_DEVSET1_TSTAT_MASK (BIT(0) | BIT(1))
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#define MAX20730_MFR_DEVSET1_RGAIN_BIT_POS 13
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#define MAX20730_MFR_DEVSET1_OTP_BIT_POS 11
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#define MAX20730_MFR_DEVSET1_VBOOT_BIT_POS 8
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#define MAX20730_MFR_DEVSET1_OCP_BIT_POS 5
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#define MAX20730_MFR_DEVSET1_FSW_BIT_POS 2
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#define MAX20730_MFR_DEVSET1_TSTAT_BIT_POS 0
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#define MAX20730_MFR_DEVSET2_IMAX_MASK GENMASK(10, 8)
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#define MAX20730_MFR_DEVSET2_VRATE (BIT(6) | BIT(7))
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#define MAX20730_MFR_DEVSET2_OCPM_MASK BIT(5)
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#define MAX20730_MFR_DEVSET2_SS_MASK (BIT(0) | BIT(1))
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#define MAX20730_MFR_DEVSET2_IMAX_BIT_POS 8
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#define MAX20730_MFR_DEVSET2_VRATE_BIT_POS 6
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#define MAX20730_MFR_DEVSET2_OCPM_BIT_POS 5
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#define MAX20730_MFR_DEVSET2_SS_BIT_POS 0
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#define DEBUG_FS_DATA_MAX 16
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struct max20730_debugfs_data {
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struct i2c_client *client;
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int debugfs_entries[MAX20730_DEBUGFS_NUM_ENTRIES];
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};
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#define to_psu(x, y) container_of((x), \
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struct max20730_debugfs_data, debugfs_entries[(y)])
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#ifdef CONFIG_DEBUG_FS
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static ssize_t max20730_debugfs_read(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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int ret, len;
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int *idxp = file->private_data;
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int idx = *idxp;
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struct max20730_debugfs_data *psu = to_psu(idxp, idx);
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const struct pmbus_driver_info *info;
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const struct max20730_data *data;
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char tbuf[DEBUG_FS_DATA_MAX] = { 0 };
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u16 val;
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info = pmbus_get_driver_info(psu->client);
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data = to_max20730_data(info);
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switch (idx) {
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case MAX20730_DEBUGFS_VOUT_MIN:
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ret = VOLT_FROM_REG(data->mfr_voutmin * 10000);
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len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d.%d\n",
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ret / 10000, ret % 10000);
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break;
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case MAX20730_DEBUGFS_FREQUENCY:
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val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_FSW_MASK)
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>> MAX20730_MFR_DEVSET1_FSW_BIT_POS;
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if (val == 0)
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ret = 400;
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else if (val == 1)
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ret = 500;
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else if (val == 2 || val == 3)
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ret = 600;
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else if (val == 4)
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ret = 700;
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else if (val == 5)
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ret = 800;
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else
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ret = 900;
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len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
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break;
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case MAX20730_DEBUGFS_PG_DELAY:
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val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_TSTAT_MASK)
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>> MAX20730_MFR_DEVSET1_TSTAT_BIT_POS;
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if (val == 0)
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len = strlcpy(tbuf, "2000\n", DEBUG_FS_DATA_MAX);
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else if (val == 1)
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len = strlcpy(tbuf, "125\n", DEBUG_FS_DATA_MAX);
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else if (val == 2)
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len = strlcpy(tbuf, "62.5\n", DEBUG_FS_DATA_MAX);
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else
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len = strlcpy(tbuf, "32\n", DEBUG_FS_DATA_MAX);
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break;
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case MAX20730_DEBUGFS_INTERNAL_GAIN:
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val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_RGAIN_MASK)
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>> MAX20730_MFR_DEVSET1_RGAIN_BIT_POS;
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if (data->id == max20734) {
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/* AN6209 */
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if (val == 0)
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len = strlcpy(tbuf, "0.8\n", DEBUG_FS_DATA_MAX);
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else if (val == 1)
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len = strlcpy(tbuf, "3.2\n", DEBUG_FS_DATA_MAX);
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else if (val == 2)
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len = strlcpy(tbuf, "1.6\n", DEBUG_FS_DATA_MAX);
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else
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len = strlcpy(tbuf, "6.4\n", DEBUG_FS_DATA_MAX);
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} else if (data->id == max20730 || data->id == max20710) {
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/* AN6042 or AN6140 */
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if (val == 0)
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len = strlcpy(tbuf, "0.9\n", DEBUG_FS_DATA_MAX);
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else if (val == 1)
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len = strlcpy(tbuf, "3.6\n", DEBUG_FS_DATA_MAX);
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else if (val == 2)
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len = strlcpy(tbuf, "1.8\n", DEBUG_FS_DATA_MAX);
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else
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len = strlcpy(tbuf, "7.2\n", DEBUG_FS_DATA_MAX);
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} else if (data->id == max20743) {
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/* AN6042 */
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if (val == 0)
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len = strlcpy(tbuf, "0.45\n", DEBUG_FS_DATA_MAX);
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else if (val == 1)
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len = strlcpy(tbuf, "1.8\n", DEBUG_FS_DATA_MAX);
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else if (val == 2)
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len = strlcpy(tbuf, "0.9\n", DEBUG_FS_DATA_MAX);
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else
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len = strlcpy(tbuf, "3.6\n", DEBUG_FS_DATA_MAX);
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} else {
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len = strlcpy(tbuf, "Not supported\n", DEBUG_FS_DATA_MAX);
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}
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break;
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case MAX20730_DEBUGFS_BOOT_VOLTAGE:
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val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_VBOOT_MASK)
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>> MAX20730_MFR_DEVSET1_VBOOT_BIT_POS;
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if (val == 0)
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len = strlcpy(tbuf, "0.6484\n", DEBUG_FS_DATA_MAX);
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else if (val == 1)
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len = strlcpy(tbuf, "0.8984\n", DEBUG_FS_DATA_MAX);
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else if (val == 2)
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len = strlcpy(tbuf, "1.0\n", DEBUG_FS_DATA_MAX);
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else
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len = strlcpy(tbuf, "Invalid\n", DEBUG_FS_DATA_MAX);
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break;
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case MAX20730_DEBUGFS_OUT_V_RAMP_RATE:
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val = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_VRATE)
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>> MAX20730_MFR_DEVSET2_VRATE_BIT_POS;
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if (val == 0)
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len = strlcpy(tbuf, "4\n", DEBUG_FS_DATA_MAX);
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else if (val == 1)
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len = strlcpy(tbuf, "2\n", DEBUG_FS_DATA_MAX);
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else if (val == 2)
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len = strlcpy(tbuf, "1\n", DEBUG_FS_DATA_MAX);
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else
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len = strlcpy(tbuf, "Invalid\n", DEBUG_FS_DATA_MAX);
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break;
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case MAX20730_DEBUGFS_OC_PROTECT_MODE:
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ret = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_OCPM_MASK)
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>> MAX20730_MFR_DEVSET2_OCPM_BIT_POS;
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len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
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break;
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case MAX20730_DEBUGFS_SS_TIMING:
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val = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_SS_MASK)
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>> MAX20730_MFR_DEVSET2_SS_BIT_POS;
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if (val == 0)
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len = strlcpy(tbuf, "0.75\n", DEBUG_FS_DATA_MAX);
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else if (val == 1)
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len = strlcpy(tbuf, "1.5\n", DEBUG_FS_DATA_MAX);
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else if (val == 2)
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len = strlcpy(tbuf, "3\n", DEBUG_FS_DATA_MAX);
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else
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len = strlcpy(tbuf, "6\n", DEBUG_FS_DATA_MAX);
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break;
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case MAX20730_DEBUGFS_IMAX:
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ret = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_IMAX_MASK)
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>> MAX20730_MFR_DEVSET2_IMAX_BIT_POS;
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len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
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break;
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case MAX20730_DEBUGFS_OPERATION:
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ret = i2c_smbus_read_byte_data(psu->client, PMBUS_OPERATION);
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if (ret < 0)
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return ret;
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len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
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break;
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case MAX20730_DEBUGFS_ON_OFF_CONFIG:
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ret = i2c_smbus_read_byte_data(psu->client, PMBUS_ON_OFF_CONFIG);
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if (ret < 0)
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return ret;
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len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
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break;
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case MAX20730_DEBUGFS_SMBALERT_MASK:
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ret = i2c_smbus_read_word_data(psu->client,
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PMBUS_SMB_ALERT_MASK);
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if (ret < 0)
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return ret;
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len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
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break;
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case MAX20730_DEBUGFS_VOUT_MODE:
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ret = i2c_smbus_read_byte_data(psu->client, PMBUS_VOUT_MODE);
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if (ret < 0)
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return ret;
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len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
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break;
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case MAX20730_DEBUGFS_VOUT_COMMAND:
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ret = i2c_smbus_read_word_data(psu->client, PMBUS_VOUT_COMMAND);
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if (ret < 0)
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return ret;
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ret = VOLT_FROM_REG(ret * 10000);
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len = scnprintf(tbuf, DEBUG_FS_DATA_MAX,
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"%d.%d\n", ret / 10000, ret % 10000);
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break;
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case MAX20730_DEBUGFS_VOUT_MAX:
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ret = i2c_smbus_read_word_data(psu->client, PMBUS_VOUT_MAX);
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if (ret < 0)
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return ret;
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ret = VOLT_FROM_REG(ret * 10000);
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len = scnprintf(tbuf, DEBUG_FS_DATA_MAX,
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"%d.%d\n", ret / 10000, ret % 10000);
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break;
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default:
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len = strlcpy(tbuf, "Invalid\n", DEBUG_FS_DATA_MAX);
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}
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return simple_read_from_buffer(buf, count, ppos, tbuf, len);
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}
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static const struct file_operations max20730_fops = {
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.llseek = noop_llseek,
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.read = max20730_debugfs_read,
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.write = NULL,
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.open = simple_open,
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};
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static int max20730_init_debugfs(struct i2c_client *client,
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struct max20730_data *data)
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{
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int ret, i;
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struct dentry *debugfs;
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struct dentry *max20730_dir;
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struct max20730_debugfs_data *psu;
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ret = i2c_smbus_read_word_data(client, MAX20730_MFR_DEVSET2);
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if (ret < 0)
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return ret;
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data->mfr_devset2 = ret;
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ret = i2c_smbus_read_word_data(client, MAX20730_MFR_VOUT_MIN);
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if (ret < 0)
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return ret;
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data->mfr_voutmin = ret;
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psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL);
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if (!psu)
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return -ENOMEM;
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psu->client = client;
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debugfs = pmbus_get_debugfs_dir(client);
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if (!debugfs)
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return -ENOENT;
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max20730_dir = debugfs_create_dir(client->name, debugfs);
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for (i = 0; i < MAX20730_DEBUGFS_NUM_ENTRIES; ++i)
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psu->debugfs_entries[i] = i;
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debugfs_create_file("vout_min", 0444, max20730_dir,
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&psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_MIN],
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&max20730_fops);
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debugfs_create_file("frequency", 0444, max20730_dir,
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&psu->debugfs_entries[MAX20730_DEBUGFS_FREQUENCY],
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&max20730_fops);
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debugfs_create_file("power_good_delay", 0444, max20730_dir,
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&psu->debugfs_entries[MAX20730_DEBUGFS_PG_DELAY],
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&max20730_fops);
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debugfs_create_file("internal_gain", 0444, max20730_dir,
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&psu->debugfs_entries[MAX20730_DEBUGFS_INTERNAL_GAIN],
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&max20730_fops);
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debugfs_create_file("boot_voltage", 0444, max20730_dir,
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&psu->debugfs_entries[MAX20730_DEBUGFS_BOOT_VOLTAGE],
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&max20730_fops);
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debugfs_create_file("out_voltage_ramp_rate", 0444, max20730_dir,
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&psu->debugfs_entries[MAX20730_DEBUGFS_OUT_V_RAMP_RATE],
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&max20730_fops);
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debugfs_create_file("oc_protection_mode", 0444, max20730_dir,
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&psu->debugfs_entries[MAX20730_DEBUGFS_OC_PROTECT_MODE],
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&max20730_fops);
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debugfs_create_file("soft_start_timing", 0444, max20730_dir,
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&psu->debugfs_entries[MAX20730_DEBUGFS_SS_TIMING],
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&max20730_fops);
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debugfs_create_file("imax", 0444, max20730_dir,
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&psu->debugfs_entries[MAX20730_DEBUGFS_IMAX],
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&max20730_fops);
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debugfs_create_file("operation", 0444, max20730_dir,
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&psu->debugfs_entries[MAX20730_DEBUGFS_OPERATION],
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&max20730_fops);
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debugfs_create_file("on_off_config", 0444, max20730_dir,
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&psu->debugfs_entries[MAX20730_DEBUGFS_ON_OFF_CONFIG],
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&max20730_fops);
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debugfs_create_file("smbalert_mask", 0444, max20730_dir,
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&psu->debugfs_entries[MAX20730_DEBUGFS_SMBALERT_MASK],
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&max20730_fops);
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debugfs_create_file("vout_mode", 0444, max20730_dir,
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&psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_MODE],
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&max20730_fops);
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debugfs_create_file("vout_command", 0444, max20730_dir,
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&psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_COMMAND],
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&max20730_fops);
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debugfs_create_file("vout_max", 0444, max20730_dir,
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&psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_MAX],
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&max20730_fops);
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return 0;
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}
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#else
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static int max20730_init_debugfs(struct i2c_client *client,
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struct max20730_data *data)
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{
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return 0;
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}
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#endif /* CONFIG_DEBUG_FS */
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static const struct i2c_device_id max20730_id[];
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/*
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* Convert discreet value to direct data format. Strictly speaking, all passed
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* values are constants, so we could do that calculation manually. On the
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* downside, that would make the driver more difficult to maintain, so lets
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* use this approach.
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*/
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static u16 val_to_direct(int v, enum pmbus_sensor_classes class,
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const struct pmbus_driver_info *info)
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{
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int R = info->R[class] - 3; /* take milli-units into account */
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int b = info->b[class] * 1000;
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long d;
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d = v * info->m[class] + b;
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/*
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* R < 0 is true for all callers, so we don't need to bother
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* about the R > 0 case.
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*/
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while (R < 0) {
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d = DIV_ROUND_CLOSEST(d, 10);
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|
R++;
|
|
}
|
|
return (u16)d;
|
|
}
|
|
|
|
static long direct_to_val(u16 w, enum pmbus_sensor_classes class,
|
|
const struct pmbus_driver_info *info)
|
|
{
|
|
int R = info->R[class] - 3;
|
|
int b = info->b[class] * 1000;
|
|
int m = info->m[class];
|
|
long d = (s16)w;
|
|
|
|
if (m == 0)
|
|
return 0;
|
|
|
|
while (R < 0) {
|
|
d *= 10;
|
|
R++;
|
|
}
|
|
d = (d - b) / m;
|
|
return d;
|
|
}
|
|
|
|
static u32 max_current[][5] = {
|
|
[max20710] = { 6200, 8000, 9700, 11600 },
|
|
[max20730] = { 13000, 16600, 20100, 23600 },
|
|
[max20734] = { 21000, 27000, 32000, 38000 },
|
|
[max20743] = { 18900, 24100, 29200, 34100 },
|
|
};
|
|
|
|
static int max20730_read_word_data(struct i2c_client *client, int page,
|
|
int phase, int reg)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
const struct max20730_data *data = to_max20730_data(info);
|
|
int ret = 0;
|
|
u32 max_c;
|
|
|
|
switch (reg) {
|
|
case PMBUS_OT_FAULT_LIMIT:
|
|
switch ((data->mfr_devset1 >> 11) & 0x3) {
|
|
case 0x0:
|
|
ret = val_to_direct(150000, PSC_TEMPERATURE, info);
|
|
break;
|
|
case 0x1:
|
|
ret = val_to_direct(130000, PSC_TEMPERATURE, info);
|
|
break;
|
|
default:
|
|
ret = -ENODATA;
|
|
break;
|
|
}
|
|
break;
|
|
case PMBUS_IOUT_OC_FAULT_LIMIT:
|
|
max_c = max_current[data->id][(data->mfr_devset1 >> 5) & 0x3];
|
|
ret = val_to_direct(max_c, PSC_CURRENT_OUT, info);
|
|
break;
|
|
case PMBUS_READ_VOUT:
|
|
ret = pmbus_read_word_data(client, page, phase, reg);
|
|
if (ret > 0 && data->vout_voltage_divider[0] && data->vout_voltage_divider[1]) {
|
|
u64 temp = DIV_ROUND_CLOSEST_ULL((u64)ret * data->vout_voltage_divider[1],
|
|
data->vout_voltage_divider[0]);
|
|
ret = clamp_val(temp, 0, 0xffff);
|
|
}
|
|
break;
|
|
default:
|
|
ret = -ENODATA;
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int max20730_write_word_data(struct i2c_client *client, int page,
|
|
int reg, u16 word)
|
|
{
|
|
struct pmbus_driver_info *info;
|
|
struct max20730_data *data;
|
|
u16 devset1;
|
|
int ret = 0;
|
|
int idx;
|
|
|
|
info = (struct pmbus_driver_info *)pmbus_get_driver_info(client);
|
|
data = to_max20730_data(info);
|
|
|
|
mutex_lock(&data->lock);
|
|
devset1 = data->mfr_devset1;
|
|
|
|
switch (reg) {
|
|
case PMBUS_OT_FAULT_LIMIT:
|
|
devset1 &= ~(BIT(11) | BIT(12));
|
|
if (direct_to_val(word, PSC_TEMPERATURE, info) < 140000)
|
|
devset1 |= BIT(11);
|
|
break;
|
|
case PMBUS_IOUT_OC_FAULT_LIMIT:
|
|
devset1 &= ~(BIT(5) | BIT(6));
|
|
|
|
idx = find_closest(direct_to_val(word, PSC_CURRENT_OUT, info),
|
|
max_current[data->id], 4);
|
|
devset1 |= (idx << 5);
|
|
break;
|
|
default:
|
|
ret = -ENODATA;
|
|
break;
|
|
}
|
|
|
|
if (!ret && devset1 != data->mfr_devset1) {
|
|
ret = i2c_smbus_write_word_data(client, MAX20730_MFR_DEVSET1,
|
|
devset1);
|
|
if (!ret) {
|
|
data->mfr_devset1 = devset1;
|
|
pmbus_clear_cache(client);
|
|
}
|
|
}
|
|
mutex_unlock(&data->lock);
|
|
return ret;
|
|
}
|
|
|
|
static const struct pmbus_driver_info max20730_info[] = {
|
|
[max20710] = {
|
|
.pages = 1,
|
|
.read_word_data = max20730_read_word_data,
|
|
.write_word_data = max20730_write_word_data,
|
|
|
|
/* Source : Maxim AN6140 and AN6042 */
|
|
.format[PSC_TEMPERATURE] = direct,
|
|
.m[PSC_TEMPERATURE] = 21,
|
|
.b[PSC_TEMPERATURE] = 5887,
|
|
.R[PSC_TEMPERATURE] = -1,
|
|
|
|
.format[PSC_VOLTAGE_IN] = direct,
|
|
.m[PSC_VOLTAGE_IN] = 3609,
|
|
.b[PSC_VOLTAGE_IN] = 0,
|
|
.R[PSC_VOLTAGE_IN] = -2,
|
|
|
|
.format[PSC_CURRENT_OUT] = direct,
|
|
.m[PSC_CURRENT_OUT] = 153,
|
|
.b[PSC_CURRENT_OUT] = 4976,
|
|
.R[PSC_CURRENT_OUT] = -1,
|
|
|
|
.format[PSC_VOLTAGE_OUT] = linear,
|
|
|
|
.func[0] = PMBUS_HAVE_VIN |
|
|
PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
|
|
PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
|
|
PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
|
|
PMBUS_HAVE_STATUS_INPUT,
|
|
},
|
|
[max20730] = {
|
|
.pages = 1,
|
|
.read_word_data = max20730_read_word_data,
|
|
.write_word_data = max20730_write_word_data,
|
|
|
|
/* Source : Maxim AN6042 */
|
|
.format[PSC_TEMPERATURE] = direct,
|
|
.m[PSC_TEMPERATURE] = 21,
|
|
.b[PSC_TEMPERATURE] = 5887,
|
|
.R[PSC_TEMPERATURE] = -1,
|
|
|
|
.format[PSC_VOLTAGE_IN] = direct,
|
|
.m[PSC_VOLTAGE_IN] = 3609,
|
|
.b[PSC_VOLTAGE_IN] = 0,
|
|
.R[PSC_VOLTAGE_IN] = -2,
|
|
|
|
/*
|
|
* Values in the datasheet are adjusted for temperature and
|
|
* for the relationship between Vin and Vout.
|
|
* Unfortunately, the data sheet suggests that Vout measurement
|
|
* may be scaled with a resistor array. This is indeed the case
|
|
* at least on the evaulation boards. As a result, any in-driver
|
|
* adjustments would either be wrong or require elaborate means
|
|
* to configure the scaling. Instead of doing that, just report
|
|
* raw values and let userspace handle adjustments.
|
|
*/
|
|
.format[PSC_CURRENT_OUT] = direct,
|
|
.m[PSC_CURRENT_OUT] = 153,
|
|
.b[PSC_CURRENT_OUT] = 4976,
|
|
.R[PSC_CURRENT_OUT] = -1,
|
|
|
|
.format[PSC_VOLTAGE_OUT] = linear,
|
|
|
|
.func[0] = PMBUS_HAVE_VIN |
|
|
PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
|
|
PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
|
|
PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
|
|
PMBUS_HAVE_STATUS_INPUT,
|
|
},
|
|
[max20734] = {
|
|
.pages = 1,
|
|
.read_word_data = max20730_read_word_data,
|
|
.write_word_data = max20730_write_word_data,
|
|
|
|
/* Source : Maxim AN6209 */
|
|
.format[PSC_TEMPERATURE] = direct,
|
|
.m[PSC_TEMPERATURE] = 21,
|
|
.b[PSC_TEMPERATURE] = 5887,
|
|
.R[PSC_TEMPERATURE] = -1,
|
|
|
|
.format[PSC_VOLTAGE_IN] = direct,
|
|
.m[PSC_VOLTAGE_IN] = 3592,
|
|
.b[PSC_VOLTAGE_IN] = 0,
|
|
.R[PSC_VOLTAGE_IN] = -2,
|
|
|
|
.format[PSC_CURRENT_OUT] = direct,
|
|
.m[PSC_CURRENT_OUT] = 111,
|
|
.b[PSC_CURRENT_OUT] = 3461,
|
|
.R[PSC_CURRENT_OUT] = -1,
|
|
|
|
.format[PSC_VOLTAGE_OUT] = linear,
|
|
|
|
.func[0] = PMBUS_HAVE_VIN |
|
|
PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
|
|
PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
|
|
PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
|
|
PMBUS_HAVE_STATUS_INPUT,
|
|
},
|
|
[max20743] = {
|
|
.pages = 1,
|
|
.read_word_data = max20730_read_word_data,
|
|
.write_word_data = max20730_write_word_data,
|
|
|
|
/* Source : Maxim AN6042 */
|
|
.format[PSC_TEMPERATURE] = direct,
|
|
.m[PSC_TEMPERATURE] = 21,
|
|
.b[PSC_TEMPERATURE] = 5887,
|
|
.R[PSC_TEMPERATURE] = -1,
|
|
|
|
.format[PSC_VOLTAGE_IN] = direct,
|
|
.m[PSC_VOLTAGE_IN] = 3597,
|
|
.b[PSC_VOLTAGE_IN] = 0,
|
|
.R[PSC_VOLTAGE_IN] = -2,
|
|
|
|
.format[PSC_CURRENT_OUT] = direct,
|
|
.m[PSC_CURRENT_OUT] = 95,
|
|
.b[PSC_CURRENT_OUT] = 5014,
|
|
.R[PSC_CURRENT_OUT] = -1,
|
|
|
|
.format[PSC_VOLTAGE_OUT] = linear,
|
|
|
|
.func[0] = PMBUS_HAVE_VIN |
|
|
PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
|
|
PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
|
|
PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
|
|
PMBUS_HAVE_STATUS_INPUT,
|
|
},
|
|
};
|
|
|
|
static int max20730_probe(struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
|
|
struct max20730_data *data;
|
|
enum chips chip_id;
|
|
int ret;
|
|
|
|
if (!i2c_check_functionality(client->adapter,
|
|
I2C_FUNC_SMBUS_READ_BYTE_DATA |
|
|
I2C_FUNC_SMBUS_READ_WORD_DATA |
|
|
I2C_FUNC_SMBUS_BLOCK_DATA))
|
|
return -ENODEV;
|
|
|
|
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "Failed to read Manufacturer ID\n");
|
|
return ret;
|
|
}
|
|
if (ret != 5 || strncmp(buf, "MAXIM", 5)) {
|
|
buf[ret] = '\0';
|
|
dev_err(dev, "Unsupported Manufacturer ID '%s'\n", buf);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* The chips support reading PMBUS_MFR_MODEL. On both MAX20730
|
|
* and MAX20734, reading it returns M20743. Presumably that is
|
|
* the reason why the command is not documented. Unfortunately,
|
|
* that means that there is no reliable means to detect the chip.
|
|
* However, we can at least detect the chip series. Compare
|
|
* the returned value against 'M20743' and bail out if there is
|
|
* a mismatch. If that doesn't work for all chips, we may have
|
|
* to remove this check.
|
|
*/
|
|
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
|
|
if (ret < 0) {
|
|
dev_err(dev, "Failed to read Manufacturer Model\n");
|
|
return ret;
|
|
}
|
|
if (ret != 6 || strncmp(buf, "M20743", 6)) {
|
|
buf[ret] = '\0';
|
|
dev_err(dev, "Unsupported Manufacturer Model '%s'\n", buf);
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_REVISION, buf);
|
|
if (ret < 0) {
|
|
dev_err(dev, "Failed to read Manufacturer Revision\n");
|
|
return ret;
|
|
}
|
|
if (ret != 1 || buf[0] != 'F') {
|
|
buf[ret] = '\0';
|
|
dev_err(dev, "Unsupported Manufacturer Revision '%s'\n", buf);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (client->dev.of_node)
|
|
chip_id = (enum chips)of_device_get_match_data(dev);
|
|
else
|
|
chip_id = i2c_match_id(max20730_id, client)->driver_data;
|
|
|
|
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
data->id = chip_id;
|
|
mutex_init(&data->lock);
|
|
memcpy(&data->info, &max20730_info[chip_id], sizeof(data->info));
|
|
if (of_property_read_u32_array(client->dev.of_node, "vout-voltage-divider",
|
|
data->vout_voltage_divider,
|
|
ARRAY_SIZE(data->vout_voltage_divider)) != 0)
|
|
memset(data->vout_voltage_divider, 0, sizeof(data->vout_voltage_divider));
|
|
if (data->vout_voltage_divider[1] < data->vout_voltage_divider[0]) {
|
|
dev_err(dev,
|
|
"The total resistance of voltage divider is less than output resistance\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = i2c_smbus_read_word_data(client, MAX20730_MFR_DEVSET1);
|
|
if (ret < 0)
|
|
return ret;
|
|
data->mfr_devset1 = ret;
|
|
|
|
ret = pmbus_do_probe(client, &data->info);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = max20730_init_debugfs(client, data);
|
|
if (ret)
|
|
dev_warn(dev, "Failed to register debugfs: %d\n",
|
|
ret);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id max20730_id[] = {
|
|
{ "max20710", max20710 },
|
|
{ "max20730", max20730 },
|
|
{ "max20734", max20734 },
|
|
{ "max20743", max20743 },
|
|
{ },
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, max20730_id);
|
|
|
|
static const struct of_device_id max20730_of_match[] = {
|
|
{ .compatible = "maxim,max20710", .data = (void *)max20710 },
|
|
{ .compatible = "maxim,max20730", .data = (void *)max20730 },
|
|
{ .compatible = "maxim,max20734", .data = (void *)max20734 },
|
|
{ .compatible = "maxim,max20743", .data = (void *)max20743 },
|
|
{ },
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, max20730_of_match);
|
|
|
|
static struct i2c_driver max20730_driver = {
|
|
.driver = {
|
|
.name = "max20730",
|
|
.of_match_table = max20730_of_match,
|
|
},
|
|
.probe_new = max20730_probe,
|
|
.id_table = max20730_id,
|
|
};
|
|
|
|
module_i2c_driver(max20730_driver);
|
|
|
|
MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
|
|
MODULE_DESCRIPTION("PMBus driver for Maxim MAX20710 / MAX20730 / MAX20734 / MAX20743");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_IMPORT_NS(PMBUS);
|