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[78.94.0.51]) by smtp.gmail.com with ESMTPSA id n17-20020a05600c465100b003cf483ee8e0sm19947254wmo.24.2022.11.22.05.50.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Nov 2022 05:50:21 -0800 (PST) From: Naresh Solanki X-Google-Original-From: Naresh Solanki To: Guenter Roeck , linux-hwmon@vger.kernel.org, Jean Delvare Cc: broonie@kernel.org, Patrick Rudolph , Naresh Solanki , linux-kernel@vger.kernel.org Subject: [PATCH 3/3] hwmon: (pmbus/core): Implement IRQ support Date: Tue, 22 Nov 2022 14:50:13 +0100 Message-Id: <20221122135014.3504094-3-Naresh.Solanki@9elements.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221122135014.3504094-1-Naresh.Solanki@9elements.com> References: <20221122135014.3504094-1-Naresh.Solanki@9elements.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org From: Patrick Rudolph Implement IRQ support to monitor PMBUS regulator events. Signed-off-by: Patrick Rudolph Signed-off-by: Naresh Solanki --- drivers/hwmon/pmbus/pmbus.h | 2 +- drivers/hwmon/pmbus/pmbus_core.c | 151 ++++++++++++++++++++++++++++--- 2 files changed, 140 insertions(+), 13 deletions(-) diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h index 10fb17879f8e..6b2e6cf93b19 100644 --- a/drivers/hwmon/pmbus/pmbus.h +++ b/drivers/hwmon/pmbus/pmbus.h @@ -26,7 +26,7 @@ enum pmbus_regs { PMBUS_CAPABILITY = 0x19, PMBUS_QUERY = 0x1A, - + PMBUS_SMBALERT_MASK = 0x1B, PMBUS_VOUT_MODE = 0x20, PMBUS_VOUT_COMMAND = 0x21, PMBUS_VOUT_TRIM = 0x22, diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c index 7d7d10039987..0c0d9419e72a 100644 --- a/drivers/hwmon/pmbus/pmbus_core.c +++ b/drivers/hwmon/pmbus/pmbus_core.c @@ -3033,13 +3033,107 @@ const struct regulator_ops pmbus_regulator_ops = { }; EXPORT_SYMBOL_NS_GPL(pmbus_regulator_ops, PMBUS); -static int pmbus_regulator_register(struct pmbus_data *data) +static int pmbus_write_smbalert_mask(struct i2c_client *client, u8 page, u8 reg, u8 val) { - struct device *dev = data->dev; + return pmbus_write_word_data(client, page, PMBUS_SMBALERT_MASK, reg | (val << 8)); +} + +static int pmbus_irq_subhandler(struct i2c_client *client, struct regulator_err_state *stat, + unsigned long *dev_mask) +{ + struct pmbus_data *data = i2c_get_clientdata(client); + u8 page = rdev_get_id(stat->rdev); + const struct pmbus_regulator_status_category *cat; + const struct pmbus_regulator_status_assoc *bit; + int status, i; + int func = data->info->func[page]; + + stat->notifs = 0; + stat->errors = 0; + + for (i = 0; i < ARRAY_SIZE(pmbus_regulator_flag_map); i++) { + cat = &pmbus_regulator_flag_map[i]; + if (!(func & cat->func)) + continue; + + status = _pmbus_read_byte_data(client, page, cat->reg); + if (status < 0) { + mutex_unlock(&data->update_lock); + return status; + } + + for (bit = cat->bits; bit->pflag; bit++) { + if (status & bit->pflag) { + stat->notifs |= bit->eflag; + stat->errors |= bit->rflag; + } + } + } + + return 0; +} + +static int pmbus_fault_handler(int irq, struct regulator_irq_data *rid, unsigned long *dev_mask) +{ + struct regulator_err_state *stat; + struct pmbus_data *data; + struct device *dev; + struct i2c_client *client; + int status; + u8 page; + int i; + + *dev_mask = 0; + rid->opaque = 0; + + for (i = 0; i < rid->num_states; i++) { + stat = &rid->states[i]; + dev = rdev_get_dev(stat->rdev); + client = to_i2c_client(dev->parent); + data = i2c_get_clientdata(client); + page = rdev_get_id(stat->rdev); + + mutex_lock(&data->update_lock); + status = pmbus_irq_subhandler(client, stat, dev_mask); + if (status < 0) { + mutex_unlock(&data->update_lock); + return REGULATOR_FAILED_RETRY; + } + + status = pmbus_read_status_byte(client, page); + if (status < 0) { + mutex_unlock(&data->update_lock); + return REGULATOR_FAILED_RETRY; + } + + if (status & ~(PB_STATUS_OFF | PB_STATUS_BUSY)) + pmbus_clear_fault_page(client, page); + mutex_unlock(&data->update_lock); + } + + return REGULATOR_ERROR_CLEARED; +} + +static int pmbus_regulator_register(struct i2c_client *client, struct pmbus_data *data) +{ + struct device *dev = &client->dev; const struct pmbus_driver_info *info = data->info; const struct pmbus_platform_data *pdata = dev_get_platdata(dev); - struct regulator_dev *rdev; - int i; + const struct pmbus_regulator_status_category *cat; + const struct pmbus_regulator_status_assoc *bit; + int func; + struct regulator_dev **rdevs; + struct regulator_irq_desc pmbus_notif = { + .name = "pmbus-irq", + .map_event = pmbus_fault_handler, + }; + void *irq_helper; + int i, j, err, errs; + u8 mask; + + rdevs = devm_kzalloc(dev, sizeof(*rdevs) * info->num_regulators, GFP_KERNEL); + if (!rdevs) + return -ENOMEM; for (i = 0; i < info->num_regulators; i++) { struct regulator_config config = { }; @@ -3050,18 +3144,51 @@ static int pmbus_regulator_register(struct pmbus_data *data) if (pdata && pdata->reg_init_data) config.init_data = &pdata->reg_init_data[i]; - rdev = devm_regulator_register(dev, &info->reg_desc[i], - &config); - if (IS_ERR(rdev)) - return dev_err_probe(dev, PTR_ERR(rdev), - "Failed to register %s regulator\n", - info->reg_desc[i].name); + rdevs[i] = devm_regulator_register(dev, &info->reg_desc[i], &config); + if (IS_ERR(rdevs[i])) { + dev_err(dev, "Failed to register %s regulator\n", + info->reg_desc[i].name); + return PTR_ERR(rdevs[i]); + } + } + + if (client->irq > 0) { + pmbus_notif.data = rdevs; + errs = 0; + for (i = 0; i < data->info->pages; i++) { + func = data->info->func[i]; + + for (j = 0; j < ARRAY_SIZE(pmbus_regulator_flag_map); j++) { + cat = &pmbus_regulator_flag_map[i]; + if (!(func & cat->func)) + continue; + mask = 0; + for (bit = cat->bits; bit->pflag; bit++) { + errs |= bit->rflag; + mask |= bit->pflag; + } + err = pmbus_write_smbalert_mask(client, i, cat->reg, ~mask); + if (err) + dev_err(dev, "Failed to set smbalert for reg 0x%02x\n", + cat->reg); + } + + } + + /* Register notifiers - can fail if IRQ is not given */ + irq_helper = devm_regulator_irq_helper(dev, &pmbus_notif, client->irq, 0, errs, + NULL, &rdevs[0], info->num_regulators); + if (IS_ERR(irq_helper)) { + if (PTR_ERR(irq_helper) == -EPROBE_DEFER) + return -EPROBE_DEFER; + dev_warn(dev, "IRQ disabled %pe\n", irq_helper); + } } return 0; } #else -static int pmbus_regulator_register(struct pmbus_data *data) +static int pmbus_regulator_register(struct i2c_client *client, struct pmbus_data *data) { return 0; } @@ -3425,7 +3552,7 @@ int pmbus_do_probe(struct i2c_client *client, struct pmbus_driver_info *info) return PTR_ERR(data->hwmon_dev); } - ret = pmbus_regulator_register(data); + ret = pmbus_regulator_register(client, data); if (ret) return ret;