// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for MAX20710, MAX20730, MAX20734, and MAX20743 Integrated,
* Step-Down Switching Regulators
*
* Copyright 2019 Google LLC.
* Copyright 2020 Maxim Integrated
*/
#include <linux/bits.h>
#include <linux/debugfs.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/pmbus.h>
#include <linux/util_macros.h>
#include "pmbus.h"
enum chips {
max20710,
max20730,
max20734,
max20743
};
enum {
MAX20730_DEBUGFS_VOUT_MIN = 0,
MAX20730_DEBUGFS_FREQUENCY,
MAX20730_DEBUGFS_PG_DELAY,
MAX20730_DEBUGFS_INTERNAL_GAIN,
MAX20730_DEBUGFS_BOOT_VOLTAGE,
MAX20730_DEBUGFS_OUT_V_RAMP_RATE,
MAX20730_DEBUGFS_OC_PROTECT_MODE,
MAX20730_DEBUGFS_SS_TIMING,
MAX20730_DEBUGFS_IMAX,
MAX20730_DEBUGFS_OPERATION,
MAX20730_DEBUGFS_ON_OFF_CONFIG,
MAX20730_DEBUGFS_SMBALERT_MASK,
MAX20730_DEBUGFS_VOUT_MODE,
MAX20730_DEBUGFS_VOUT_COMMAND,
MAX20730_DEBUGFS_VOUT_MAX,
MAX20730_DEBUGFS_NUM_ENTRIES
};
struct max20730_data {
enum chips id;
struct pmbus_driver_info info;
struct mutex lock; /* Used to protect against parallel writes */
u16 mfr_devset1;
u16 mfr_devset2;
u16 mfr_voutmin;
u32 vout_voltage_divider[2];
};
#define to_max20730_data(x) container_of(x, struct max20730_data, info)
#define VOLT_FROM_REG(val) DIV_ROUND_CLOSEST((val), 1 << 9)
#define PMBUS_SMB_ALERT_MASK 0x1B
#define MAX20730_MFR_VOUT_MIN 0xd1
#define MAX20730_MFR_DEVSET1 0xd2
#define MAX20730_MFR_DEVSET2 0xd3
#define MAX20730_MFR_VOUT_MIN_MASK GENMASK(9, 0)
#define MAX20730_MFR_VOUT_MIN_BIT_POS 0
#define MAX20730_MFR_DEVSET1_RGAIN_MASK (BIT(13) | BIT(14))
#define MAX20730_MFR_DEVSET1_OTP_MASK (BIT(11) | BIT(12))
#define MAX20730_MFR_DEVSET1_VBOOT_MASK (BIT(8) | BIT(9))
#define MAX20730_MFR_DEVSET1_OCP_MASK (BIT(5) | BIT(6))
#define MAX20730_MFR_DEVSET1_FSW_MASK GENMASK(4, 2)
#define MAX20730_MFR_DEVSET1_TSTAT_MASK (BIT(0) | BIT(1))
#define MAX20730_MFR_DEVSET1_RGAIN_BIT_POS 13
#define MAX20730_MFR_DEVSET1_OTP_BIT_POS 11
#define MAX20730_MFR_DEVSET1_VBOOT_BIT_POS 8
#define MAX20730_MFR_DEVSET1_OCP_BIT_POS 5
#define MAX20730_MFR_DEVSET1_FSW_BIT_POS 2
#define MAX20730_MFR_DEVSET1_TSTAT_BIT_POS 0
#define MAX20730_MFR_DEVSET2_IMAX_MASK GENMASK(10, 8)
#define MAX20730_MFR_DEVSET2_VRATE (BIT(6) | BIT(7))
#define MAX20730_MFR_DEVSET2_OCPM_MASK BIT(5)
#define MAX20730_MFR_DEVSET2_SS_MASK (BIT(0) | BIT(1))
#define MAX20730_MFR_DEVSET2_IMAX_BIT_POS 8
#define MAX20730_MFR_DEVSET2_VRATE_BIT_POS 6
#define MAX20730_MFR_DEVSET2_OCPM_BIT_POS 5
#define MAX20730_MFR_DEVSET2_SS_BIT_POS 0
#define DEBUG_FS_DATA_MAX 16
struct max20730_debugfs_data {
struct i2c_client *client;
int debugfs_entries[MAX20730_DEBUGFS_NUM_ENTRIES];
};
#define to_psu(x, y) container_of((x), \
struct max20730_debugfs_data, debugfs_entries[(y)])
#ifdef CONFIG_DEBUG_FS
static ssize_t max20730_debugfs_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
int ret, len;
int *idxp = file->private_data;
int idx = *idxp;
struct max20730_debugfs_data *psu = to_psu(idxp, idx);
const struct pmbus_driver_info *info;
const struct max20730_data *data;
char tbuf[DEBUG_FS_DATA_MAX] = { 0 };
char *result = tbuf;
u16 val;
info = pmbus_get_driver_info(psu->client);
data = to_max20730_data(info);
switch (idx) {
case MAX20730_DEBUGFS_VOUT_MIN:
ret = VOLT_FROM_REG(data->mfr_voutmin * 10000);
len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d.%d\n",
ret / 10000, ret % 10000);
break;
case MAX20730_DEBUGFS_FREQUENCY:
val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_FSW_MASK)
>> MAX20730_MFR_DEVSET1_FSW_BIT_POS;
if (val == 0)
ret = 400;
else if (val == 1)
ret = 500;
else if (val == 2 || val == 3)
ret = 600;
else if (val == 4)
ret = 700;
else if (val == 5)
ret = 800;
else
ret = 900;
len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
break;
case MAX20730_DEBUGFS_PG_DELAY:
val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_TSTAT_MASK)
>> MAX20730_MFR_DEVSET1_TSTAT_BIT_POS;
if (val == 0)
result = "2000\n";
else if (val == 1)
result = "125\n";
else if (val == 2)
result = "62.5\n";
else
result = "32\n";
break;
case MAX20730_DEBUGFS_INTERNAL_GAIN:
val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_RGAIN_MASK)
>> MAX20730_MFR_DEVSET1_RGAIN_BIT_POS;
if (data->id == max20734) {
/* AN6209 */
if (val == 0)
result = "0.8\n";
else if (val == 1)
result = "3.2\n";
else if (val == 2)
result = "1.6\n";
else
result = "6.4\n";
} else if (data->id == max20730 || data->id == max20710) {
/* AN6042 or AN6140 */
if (val == 0)
result = "0.9\n";
else if (val == 1)
result = "3.6\n";
else if (val == 2)
result = "1.8\n";
else
result = "7.2\n";
} else if (data->id == max20743) {
/* AN6042 */
if (val == 0)
result = "0.45\n";
else if (val == 1)
result = "1.8\n";
else if (val == 2)
result = "0.9\n";
else
result = "3.6\n";
} else {
result = "Not supported\n";
}
break;
case MAX20730_DEBUGFS_BOOT_VOLTAGE:
val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_VBOOT_MASK)
>> MAX20730_MFR_DEVSET1_VBOOT_BIT_POS;
if (val == 0)
result = "0.6484\n";
else if (val == 1)
result = "0.8984\n";
else if (val == 2)
result = "1.0\n";
else
result = "Invalid\n";
break;
case MAX20730_DEBUGFS_OUT_V_RAMP_RATE:
val = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_VRATE)
>> MAX20730_MFR_DEVSET2_VRATE_BIT_POS;
if (val == 0)
result = "4\n";
else if (val == 1)
result = "2\n";
else if (val == 2)
result = "1\n";
else
result = "Invalid\n";
break;
case MAX20730_DEBUGFS_OC_PROTECT_MODE:
ret = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_OCPM_MASK)
>> MAX20730_MFR_DEVSET2_OCPM_BIT_POS;
len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
break;
case MAX20730_DEBUGFS_SS_TIMING:
val = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_SS_MASK)
>> MAX20730_MFR_DEVSET2_SS_BIT_POS;
if (val == 0)
result = "0.75\n";
else if (val == 1)
result = "1.5\n";
else if (val == 2)
result = "3\n";
else
result = "6\n";
break;
case MAX20730_DEBUGFS_IMAX:
ret = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_IMAX_MASK)
>> MAX20730_MFR_DEVSET2_IMAX_BIT_POS;
len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
break;
case MAX20730_DEBUGFS_OPERATION:
ret = i2c_smbus_read_byte_data(psu->client, PMBUS_OPERATION);
if (ret < 0)
return ret;
len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
break;
case MAX20730_DEBUGFS_ON_OFF_CONFIG:
ret = i2c_smbus_read_byte_data(psu->client, PMBUS_ON_OFF_CONFIG);
if (ret < 0)
return ret;
len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
break;
case MAX20730_DEBUGFS_SMBALERT_MASK:
ret = i2c_smbus_read_word_data(psu->client,
PMBUS_SMB_ALERT_MASK);
if (ret < 0)
return ret;
len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
break;
case MAX20730_DEBUGFS_VOUT_MODE:
ret = i2c_smbus_read_byte_data(psu->client, PMBUS_VOUT_MODE);
if (ret < 0)
return ret;
len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret);
break;
case MAX20730_DEBUGFS_VOUT_COMMAND:
ret = i2c_smbus_read_word_data(psu->client, PMBUS_VOUT_COMMAND);
if (ret < 0)
return ret;
ret = VOLT_FROM_REG(ret * 10000);
len = scnprintf(tbuf, DEBUG_FS_DATA_MAX,
"%d.%d\n", ret / 10000, ret % 10000);
break;
case MAX20730_DEBUGFS_VOUT_MAX:
ret = i2c_smbus_read_word_data(psu->client, PMBUS_VOUT_MAX);
if (ret < 0)
return ret;
ret = VOLT_FROM_REG(ret * 10000);
len = scnprintf(tbuf, DEBUG_FS_DATA_MAX,
"%d.%d\n", ret / 10000, ret % 10000);
break;
default:
result = "Invalid\n";
}
len = strlen(result);
return simple_read_from_buffer(buf, count, ppos, result, len);
}
static const struct file_operations max20730_fops = {
.llseek = noop_llseek,
.read = max20730_debugfs_read,
.write = NULL,
.open = simple_open,
};
static int max20730_init_debugfs(struct i2c_client *client,
struct max20730_data *data)
{
int ret, i;
struct dentry *debugfs;
struct dentry *max20730_dir;
struct max20730_debugfs_data *psu;
ret = i2c_smbus_read_word_data(client, MAX20730_MFR_DEVSET2);
if (ret < 0)
return ret;
data->mfr_devset2 = ret;
ret = i2c_smbus_read_word_data(client, MAX20730_MFR_VOUT_MIN);
if (ret < 0)
return ret;
data->mfr_voutmin = ret;
psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL);
if (!psu)
return -ENOMEM;
psu->client = client;
debugfs = pmbus_get_debugfs_dir(client);
if (!debugfs)
return -ENOENT;
max20730_dir = debugfs_create_dir(client->name, debugfs);
for (i = 0; i < MAX20730_DEBUGFS_NUM_ENTRIES; ++i)
psu->debugfs_entries[i] = i;
debugfs_create_file("vout_min", 0444, max20730_dir,
&psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_MIN],
&max20730_fops);
debugfs_create_file("frequency", 0444, max20730_dir,
&psu->debugfs_entries[MAX20730_DEBUGFS_FREQUENCY],
&max20730_fops);
debugfs_create_file("power_good_delay", 0444, max20730_dir,
&psu->debugfs_entries[MAX20730_DEBUGFS_PG_DELAY],
&max20730_fops);
debugfs_create_file("internal_gain", 0444, max20730_dir,
&psu->debugfs_entries[MAX20730_DEBUGFS_INTERNAL_GAIN],
&max20730_fops);
debugfs_create_file("boot_voltage", 0444, max20730_dir,
&psu->debugfs_entries[MAX20730_DEBUGFS_BOOT_VOLTAGE],
&max20730_fops);
debugfs_create_file("out_voltage_ramp_rate", 0444, max20730_dir,
&psu->debugfs_entries[MAX20730_DEBUGFS_OUT_V_RAMP_RATE],
&max20730_fops);
debugfs_create_file("oc_protection_mode", 0444, max20730_dir,
&psu->debugfs_entries[MAX20730_DEBUGFS_OC_PROTECT_MODE],
&max20730_fops);
debugfs_create_file("soft_start_timing", 0444, max20730_dir,
&psu->debugfs_entries[MAX20730_DEBUGFS_SS_TIMING],
&max20730_fops);
debugfs_create_file("imax", 0444, max20730_dir,
&psu->debugfs_entries[MAX20730_DEBUGFS_IMAX],
&max20730_fops);
debugfs_create_file("operation", 0444, max20730_dir,
&psu->debugfs_entries[MAX20730_DEBUGFS_OPERATION],
&max20730_fops);
debugfs_create_file("on_off_config", 0444, max20730_dir,
&psu->debugfs_entries[MAX20730_DEBUGFS_ON_OFF_CONFIG],
&max20730_fops);
debugfs_create_file("smbalert_mask", 0444, max20730_dir,
&psu->debugfs_entries[MAX20730_DEBUGFS_SMBALERT_MASK],
&max20730_fops);
debugfs_create_file("vout_mode", 0444, max20730_dir,
&psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_MODE],
&max20730_fops);
debugfs_create_file("vout_command", 0444, max20730_dir,
&psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_COMMAND],
&max20730_fops);
debugfs_create_file("vout_max", 0444, max20730_dir,
&psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_MAX],
&max20730_fops);
return 0;
}
#else
static int max20730_init_debugfs(struct i2c_client *client,
struct max20730_data *data)
{
return 0;
}
#endif /* CONFIG_DEBUG_FS */
static const struct i2c_device_id max20730_id[];
/*
* Convert discreet value to direct data format. Strictly speaking, all passed
* values are constants, so we could do that calculation manually. On the
* downside, that would make the driver more difficult to maintain, so lets
* use this approach.
*/
static u16 val_to_direct(int v, enum pmbus_sensor_classes class,
const struct pmbus_driver_info *info)
{
int R = info->R[class] - 3; /* take milli-units into account */
int b = info->b[class] * 1000;
long d;
d = v * info->m[class] + b;
/*
* R < 0 is true for all callers, so we don't need to bother
* about the R > 0 case.
*/
while (R < 0) {
d = DIV_ROUND_CLOSEST(d, 10);
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 = (uintptr_t)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 = 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);
