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power: supply: max1720x: add read support for nvmem
ModelGauge m5 and device configuration values are stored in nonvolatile memory to prevent data loss if the IC loses power. Add read support for the nonvolatile memory on MAX1720X devices. Signed-off-by: Dimitri Fedrau <dima.fedrau@gmail.com> Link: https://lore.kernel.org/r/20240903063526.222890-1-dima.fedrau@gmail.com Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Dimitri Fedrau
Sebastian Reichel
parent
9dad0127ad
commit
47271a9356
@ -10,13 +10,16 @@
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#include <linux/bitfield.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/nvmem-provider.h>
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#include <linux/power_supply.h>
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#include <linux/regmap.h>
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#include <asm/unaligned.h>
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/* Nonvolatile registers */
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#define MAX1720X_NXTABLE0 0x80
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#define MAX1720X_NRSENSE 0xCF /* RSense in 10^-5 Ohm */
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#define MAX1720X_NDEVICE_NAME4 0xDF
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/* ModelGauge m5 */
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#define MAX172XX_STATUS 0x00 /* Status */
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@ -46,6 +49,8 @@ static const char *const max17205_model = "MAX17205";
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struct max1720x_device_info {
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struct regmap *regmap;
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struct regmap *regmap_nv;
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struct i2c_client *ancillary;
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int rsense;
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};
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@ -106,6 +111,134 @@ static const struct regmap_config max1720x_regmap_cfg = {
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.cache_type = REGCACHE_RBTREE,
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};
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static const struct regmap_range max1720x_nvmem_allow[] = {
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regmap_reg_range(MAX1720X_NXTABLE0, MAX1720X_NDEVICE_NAME4),
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};
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static const struct regmap_range max1720x_nvmem_deny[] = {
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regmap_reg_range(0x00, 0x7F),
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regmap_reg_range(0xE0, 0xFF),
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};
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static const struct regmap_access_table max1720x_nvmem_regs = {
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.yes_ranges = max1720x_nvmem_allow,
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.n_yes_ranges = ARRAY_SIZE(max1720x_nvmem_allow),
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.no_ranges = max1720x_nvmem_deny,
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.n_no_ranges = ARRAY_SIZE(max1720x_nvmem_deny),
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};
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static const struct regmap_config max1720x_nvmem_regmap_cfg = {
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.reg_bits = 8,
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.val_bits = 16,
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.max_register = MAX1720X_NDEVICE_NAME4,
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.val_format_endian = REGMAP_ENDIAN_LITTLE,
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.rd_table = &max1720x_nvmem_regs,
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};
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static const struct nvmem_cell_info max1720x_nvmem_cells[] = {
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{ .name = "nXTable0", .offset = 0, .bytes = 2, },
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{ .name = "nXTable1", .offset = 2, .bytes = 2, },
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{ .name = "nXTable2", .offset = 4, .bytes = 2, },
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{ .name = "nXTable3", .offset = 6, .bytes = 2, },
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{ .name = "nXTable4", .offset = 8, .bytes = 2, },
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{ .name = "nXTable5", .offset = 10, .bytes = 2, },
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{ .name = "nXTable6", .offset = 12, .bytes = 2, },
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{ .name = "nXTable7", .offset = 14, .bytes = 2, },
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{ .name = "nXTable8", .offset = 16, .bytes = 2, },
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{ .name = "nXTable9", .offset = 18, .bytes = 2, },
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{ .name = "nXTable10", .offset = 20, .bytes = 2, },
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{ .name = "nXTable11", .offset = 22, .bytes = 2, },
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{ .name = "nUser18C", .offset = 24, .bytes = 2, },
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{ .name = "nUser18D", .offset = 26, .bytes = 2, },
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{ .name = "nODSCTh", .offset = 28, .bytes = 2, },
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{ .name = "nODSCCfg", .offset = 30, .bytes = 2, },
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{ .name = "nOCVTable0", .offset = 32, .bytes = 2, },
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{ .name = "nOCVTable1", .offset = 34, .bytes = 2, },
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{ .name = "nOCVTable2", .offset = 36, .bytes = 2, },
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{ .name = "nOCVTable3", .offset = 38, .bytes = 2, },
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{ .name = "nOCVTable4", .offset = 40, .bytes = 2, },
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{ .name = "nOCVTable5", .offset = 42, .bytes = 2, },
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{ .name = "nOCVTable6", .offset = 44, .bytes = 2, },
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{ .name = "nOCVTable7", .offset = 46, .bytes = 2, },
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{ .name = "nOCVTable8", .offset = 48, .bytes = 2, },
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{ .name = "nOCVTable9", .offset = 50, .bytes = 2, },
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{ .name = "nOCVTable10", .offset = 52, .bytes = 2, },
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{ .name = "nOCVTable11", .offset = 54, .bytes = 2, },
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{ .name = "nIChgTerm", .offset = 56, .bytes = 2, },
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{ .name = "nFilterCfg", .offset = 58, .bytes = 2, },
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{ .name = "nVEmpty", .offset = 60, .bytes = 2, },
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{ .name = "nLearnCfg", .offset = 62, .bytes = 2, },
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{ .name = "nQRTable00", .offset = 64, .bytes = 2, },
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{ .name = "nQRTable10", .offset = 66, .bytes = 2, },
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{ .name = "nQRTable20", .offset = 68, .bytes = 2, },
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{ .name = "nQRTable30", .offset = 70, .bytes = 2, },
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{ .name = "nCycles", .offset = 72, .bytes = 2, },
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{ .name = "nFullCapNom", .offset = 74, .bytes = 2, },
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{ .name = "nRComp0", .offset = 76, .bytes = 2, },
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{ .name = "nTempCo", .offset = 78, .bytes = 2, },
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{ .name = "nIAvgEmpty", .offset = 80, .bytes = 2, },
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{ .name = "nFullCapRep", .offset = 82, .bytes = 2, },
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{ .name = "nVoltTemp", .offset = 84, .bytes = 2, },
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{ .name = "nMaxMinCurr", .offset = 86, .bytes = 2, },
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{ .name = "nMaxMinVolt", .offset = 88, .bytes = 2, },
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{ .name = "nMaxMinTemp", .offset = 90, .bytes = 2, },
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{ .name = "nSOC", .offset = 92, .bytes = 2, },
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{ .name = "nTimerH", .offset = 94, .bytes = 2, },
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{ .name = "nConfig", .offset = 96, .bytes = 2, },
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{ .name = "nRippleCfg", .offset = 98, .bytes = 2, },
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{ .name = "nMiscCfg", .offset = 100, .bytes = 2, },
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{ .name = "nDesignCap", .offset = 102, .bytes = 2, },
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{ .name = "nHibCfg", .offset = 104, .bytes = 2, },
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{ .name = "nPackCfg", .offset = 106, .bytes = 2, },
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{ .name = "nRelaxCfg", .offset = 108, .bytes = 2, },
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{ .name = "nConvgCfg", .offset = 110, .bytes = 2, },
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{ .name = "nNVCfg0", .offset = 112, .bytes = 2, },
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{ .name = "nNVCfg1", .offset = 114, .bytes = 2, },
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{ .name = "nNVCfg2", .offset = 116, .bytes = 2, },
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{ .name = "nSBSCfg", .offset = 118, .bytes = 2, },
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{ .name = "nROMID0", .offset = 120, .bytes = 2, },
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{ .name = "nROMID1", .offset = 122, .bytes = 2, },
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{ .name = "nROMID2", .offset = 124, .bytes = 2, },
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{ .name = "nROMID3", .offset = 126, .bytes = 2, },
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{ .name = "nVAlrtTh", .offset = 128, .bytes = 2, },
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{ .name = "nTAlrtTh", .offset = 130, .bytes = 2, },
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{ .name = "nSAlrtTh", .offset = 132, .bytes = 2, },
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{ .name = "nIAlrtTh", .offset = 134, .bytes = 2, },
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{ .name = "nUser1C4", .offset = 136, .bytes = 2, },
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{ .name = "nUser1C5", .offset = 138, .bytes = 2, },
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{ .name = "nFullSOCThr", .offset = 140, .bytes = 2, },
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{ .name = "nTTFCfg", .offset = 142, .bytes = 2, },
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{ .name = "nCGain", .offset = 144, .bytes = 2, },
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{ .name = "nTCurve", .offset = 146, .bytes = 2, },
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{ .name = "nTGain", .offset = 148, .bytes = 2, },
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{ .name = "nTOff", .offset = 150, .bytes = 2, },
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{ .name = "nManfctrName0", .offset = 152, .bytes = 2, },
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{ .name = "nManfctrName1", .offset = 154, .bytes = 2, },
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{ .name = "nManfctrName2", .offset = 156, .bytes = 2, },
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{ .name = "nRSense", .offset = 158, .bytes = 2, },
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{ .name = "nUser1D0", .offset = 160, .bytes = 2, },
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{ .name = "nUser1D1", .offset = 162, .bytes = 2, },
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{ .name = "nAgeFcCfg", .offset = 164, .bytes = 2, },
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{ .name = "nDesignVoltage", .offset = 166, .bytes = 2, },
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{ .name = "nUser1D4", .offset = 168, .bytes = 2, },
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{ .name = "nRFastVShdn", .offset = 170, .bytes = 2, },
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{ .name = "nManfctrDate", .offset = 172, .bytes = 2, },
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{ .name = "nFirstUsed", .offset = 174, .bytes = 2, },
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{ .name = "nSerialNumber0", .offset = 176, .bytes = 2, },
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{ .name = "nSerialNumber1", .offset = 178, .bytes = 2, },
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{ .name = "nSerialNumber2", .offset = 180, .bytes = 2, },
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{ .name = "nDeviceName0", .offset = 182, .bytes = 2, },
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{ .name = "nDeviceName1", .offset = 184, .bytes = 2, },
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{ .name = "nDeviceName2", .offset = 186, .bytes = 2, },
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{ .name = "nDeviceName3", .offset = 188, .bytes = 2, },
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{ .name = "nDeviceName4", .offset = 190, .bytes = 2, },
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};
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static const enum power_supply_property max1720x_battery_props[] = {
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_CAPACITY,
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@ -249,30 +382,81 @@ static int max1720x_battery_get_property(struct power_supply *psy,
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return ret;
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}
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static int max1720x_probe_sense_resistor(struct i2c_client *client,
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struct max1720x_device_info *info)
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static
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int max1720x_nvmem_reg_read(void *priv, unsigned int off, void *val, size_t len)
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{
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struct max1720x_device_info *info = priv;
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unsigned int reg = MAX1720X_NXTABLE0 + (off / 2);
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return regmap_bulk_read(info->regmap_nv, reg, val, len / 2);
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}
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static void max1720x_unregister_ancillary(void *data)
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{
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struct max1720x_device_info *info = data;
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i2c_unregister_device(info->ancillary);
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}
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static int max1720x_probe_nvmem(struct i2c_client *client,
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struct max1720x_device_info *info)
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{
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struct device *dev = &client->dev;
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struct i2c_client *ancillary;
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struct nvmem_config nvmem_config = {
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.dev = dev,
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.name = "max1720x_nvmem",
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.cells = max1720x_nvmem_cells,
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.ncells = ARRAY_SIZE(max1720x_nvmem_cells),
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.read_only = true,
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.root_only = true,
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.reg_read = max1720x_nvmem_reg_read,
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.size = ARRAY_SIZE(max1720x_nvmem_cells) * 2,
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.word_size = 2,
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.stride = 2,
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.priv = info,
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};
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struct nvmem_device *nvmem;
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unsigned int val;
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int ret;
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ancillary = i2c_new_ancillary_device(client, "nvmem", 0xb);
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if (IS_ERR(ancillary)) {
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info->ancillary = i2c_new_ancillary_device(client, "nvmem", 0xb);
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if (IS_ERR(info->ancillary)) {
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dev_err(dev, "Failed to initialize ancillary i2c device\n");
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return PTR_ERR(ancillary);
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return PTR_ERR(info->ancillary);
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}
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ret = i2c_smbus_read_word_data(ancillary, MAX1720X_NRSENSE);
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i2c_unregister_device(ancillary);
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if (ret < 0)
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ret = devm_add_action_or_reset(dev, max1720x_unregister_ancillary, info);
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if (ret) {
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i2c_unregister_device(info->ancillary);
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dev_err(dev, "Failed to add unregister callback\n");
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return ret;
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}
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info->rsense = ret;
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info->regmap_nv = devm_regmap_init_i2c(info->ancillary,
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&max1720x_nvmem_regmap_cfg);
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if (IS_ERR(info->regmap_nv)) {
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dev_err(dev, "regmap initialization of nvmem failed\n");
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return PTR_ERR(info->regmap_nv);
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}
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ret = regmap_read(info->regmap_nv, MAX1720X_NRSENSE, &val);
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if (ret < 0) {
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dev_err(dev, "Failed to read sense resistor value\n");
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return ret;
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}
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info->rsense = val;
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if (!info->rsense) {
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dev_warn(dev, "RSense not calibrated, set 10 mOhms!\n");
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info->rsense = 1000; /* in regs in 10^-5 */
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}
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nvmem = devm_nvmem_register(dev, &nvmem_config);
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if (IS_ERR(nvmem)) {
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dev_err(dev, "Could not register nvmem!");
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return PTR_ERR(nvmem);
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}
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return 0;
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}
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@ -299,15 +483,15 @@ static int max1720x_probe(struct i2c_client *client)
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psy_cfg.drv_data = info;
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psy_cfg.fwnode = dev_fwnode(dev);
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i2c_set_clientdata(client, info);
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info->regmap = devm_regmap_init_i2c(client, &max1720x_regmap_cfg);
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if (IS_ERR(info->regmap))
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return dev_err_probe(dev, PTR_ERR(info->regmap),
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"regmap initialization failed\n");
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ret = max1720x_probe_sense_resistor(client, info);
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ret = max1720x_probe_nvmem(client, info);
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if (ret)
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return dev_err_probe(dev, ret,
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"Failed to read sense resistor value\n");
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return dev_err_probe(dev, ret, "Failed to probe nvmem\n");
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bat = devm_power_supply_register(dev, &max1720x_bat_desc, &psy_cfg);
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if (IS_ERR(bat))
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