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-rw-r--r--drivers/hwmon/pmbus/max20730.c788
1 files changed, 788 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/max20730.c b/drivers/hwmon/pmbus/max20730.c
new file mode 100644
index 000000000..ba39f03c6
--- /dev/null
+++ b/drivers/hwmon/pmbus/max20730.c
@@ -0,0 +1,788 @@
+// 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_device.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 };
+ 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)
+ len = strlcpy(tbuf, "2000\n", DEBUG_FS_DATA_MAX);
+ else if (val == 1)
+ len = strlcpy(tbuf, "125\n", DEBUG_FS_DATA_MAX);
+ else if (val == 2)
+ len = strlcpy(tbuf, "62.5\n", DEBUG_FS_DATA_MAX);
+ else
+ len = strlcpy(tbuf, "32\n", DEBUG_FS_DATA_MAX);
+ 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)
+ len = strlcpy(tbuf, "0.8\n", DEBUG_FS_DATA_MAX);
+ else if (val == 1)
+ len = strlcpy(tbuf, "3.2\n", DEBUG_FS_DATA_MAX);
+ else if (val == 2)
+ len = strlcpy(tbuf, "1.6\n", DEBUG_FS_DATA_MAX);
+ else
+ len = strlcpy(tbuf, "6.4\n", DEBUG_FS_DATA_MAX);
+ } else if (data->id == max20730 || data->id == max20710) {
+ /* AN6042 or AN6140 */
+ if (val == 0)
+ len = strlcpy(tbuf, "0.9\n", DEBUG_FS_DATA_MAX);
+ else if (val == 1)
+ len = strlcpy(tbuf, "3.6\n", DEBUG_FS_DATA_MAX);
+ else if (val == 2)
+ len = strlcpy(tbuf, "1.8\n", DEBUG_FS_DATA_MAX);
+ else
+ len = strlcpy(tbuf, "7.2\n", DEBUG_FS_DATA_MAX);
+ } else if (data->id == max20743) {
+ /* AN6042 */
+ if (val == 0)
+ len = strlcpy(tbuf, "0.45\n", DEBUG_FS_DATA_MAX);
+ else if (val == 1)
+ len = strlcpy(tbuf, "1.8\n", DEBUG_FS_DATA_MAX);
+ else if (val == 2)
+ len = strlcpy(tbuf, "0.9\n", DEBUG_FS_DATA_MAX);
+ else
+ len = strlcpy(tbuf, "3.6\n", DEBUG_FS_DATA_MAX);
+ } else {
+ len = strlcpy(tbuf, "Not supported\n", DEBUG_FS_DATA_MAX);
+ }
+ break;
+ case MAX20730_DEBUGFS_BOOT_VOLTAGE:
+ val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_VBOOT_MASK)
+ >> MAX20730_MFR_DEVSET1_VBOOT_BIT_POS;
+
+ if (val == 0)
+ len = strlcpy(tbuf, "0.6484\n", DEBUG_FS_DATA_MAX);
+ else if (val == 1)
+ len = strlcpy(tbuf, "0.8984\n", DEBUG_FS_DATA_MAX);
+ else if (val == 2)
+ len = strlcpy(tbuf, "1.0\n", DEBUG_FS_DATA_MAX);
+ else
+ len = strlcpy(tbuf, "Invalid\n", DEBUG_FS_DATA_MAX);
+ 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)
+ len = strlcpy(tbuf, "4\n", DEBUG_FS_DATA_MAX);
+ else if (val == 1)
+ len = strlcpy(tbuf, "2\n", DEBUG_FS_DATA_MAX);
+ else if (val == 2)
+ len = strlcpy(tbuf, "1\n", DEBUG_FS_DATA_MAX);
+ else
+ len = strlcpy(tbuf, "Invalid\n", DEBUG_FS_DATA_MAX);
+ 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)
+ len = strlcpy(tbuf, "0.75\n", DEBUG_FS_DATA_MAX);
+ else if (val == 1)
+ len = strlcpy(tbuf, "1.5\n", DEBUG_FS_DATA_MAX);
+ else if (val == 2)
+ len = strlcpy(tbuf, "3\n", DEBUG_FS_DATA_MAX);
+ else
+ len = strlcpy(tbuf, "6\n", DEBUG_FS_DATA_MAX);
+ 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:
+ len = strlcpy(tbuf, "Invalid\n", DEBUG_FS_DATA_MAX);
+ }
+
+ return simple_read_from_buffer(buf, count, ppos, tbuf, 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 = (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);