diff options
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/Kconfig | 4 | ||||
| -rw-r--r-- | drivers/pwm/Makefile | 1 | ||||
| -rw-r--r-- | drivers/pwm/core.c | 606 | ||||
| -rw-r--r-- | drivers/pwm/pwm-bcm2835.c | 30 | ||||
| -rw-r--r-- | drivers/pwm/pwm-dwc-core.c | 1 | ||||
| -rw-r--r-- | drivers/pwm/pwm-dwc.c | 88 | ||||
| -rw-r--r-- | drivers/pwm/pwm-dwc.h | 6 | ||||
| -rw-r--r-- | drivers/pwm/pwm-img.c | 4 | ||||
| -rw-r--r-- | drivers/pwm/pwm-meson.c | 213 | ||||
| -rw-r--r-- | drivers/pwm/pwm-pca9685.c | 4 | ||||
| -rw-r--r-- | drivers/pwm/pwm-sti.c | 159 | ||||
| -rw-r--r-- | drivers/pwm/pwm-stm32.c | 60 | ||||
| -rw-r--r-- | drivers/pwm/sysfs.c | 545 |
13 files changed, 872 insertions, 849 deletions
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index 4b956d661755..1dd7921194f5 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -29,10 +29,6 @@ menuconfig PWM if PWM -config PWM_SYSFS - bool - default y if SYSFS - config PWM_DEBUG bool "PWM lowlevel drivers additional checks and debug messages" depends on DEBUG_KERNEL diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index c5ec9e168ee7..90913519f11a 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -1,6 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_PWM) += core.o -obj-$(CONFIG_PWM_SYSFS) += sysfs.o obj-$(CONFIG_PWM_AB8500) += pwm-ab8500.o obj-$(CONFIG_PWM_APPLE) += pwm-apple.o obj-$(CONFIG_PWM_ATMEL) += pwm-atmel.o diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index d70f793ce4b3..18574857641e 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -343,9 +343,16 @@ static int pwm_device_request(struct pwm_device *pwm, const char *label) if (!try_module_get(chip->owner)) return -ENODEV; + if (!get_device(&chip->dev)) { + err = -ENODEV; + goto err_get_device; + } + if (ops->request) { err = ops->request(chip, pwm); if (err) { + put_device(&chip->dev); +err_get_device: module_put(chip->owner); return err; } @@ -443,7 +450,7 @@ of_pwm_single_xlate(struct pwm_chip *chip, const struct of_phandle_args *args) if (IS_ERR(pwm)) return pwm; - if (args->args_count > 1) + if (args->args_count > 0) pwm->args.period = args->args[0]; pwm->args.polarity = PWM_POLARITY_NORMAL; @@ -454,36 +461,557 @@ of_pwm_single_xlate(struct pwm_chip *chip, const struct of_phandle_args *args) } EXPORT_SYMBOL_GPL(of_pwm_single_xlate); +struct pwm_export { + struct device pwm_dev; + struct pwm_device *pwm; + struct mutex lock; + struct pwm_state suspend; +}; + +static inline struct pwm_chip *pwmchip_from_dev(struct device *pwmchip_dev) +{ + return container_of(pwmchip_dev, struct pwm_chip, dev); +} + +static inline struct pwm_export *pwmexport_from_dev(struct device *pwm_dev) +{ + return container_of(pwm_dev, struct pwm_export, pwm_dev); +} + +static inline struct pwm_device *pwm_from_dev(struct device *pwm_dev) +{ + struct pwm_export *export = pwmexport_from_dev(pwm_dev); + + return export->pwm; +} + +static ssize_t period_show(struct device *pwm_dev, + struct device_attribute *attr, + char *buf) +{ + const struct pwm_device *pwm = pwm_from_dev(pwm_dev); + struct pwm_state state; + + pwm_get_state(pwm, &state); + + return sysfs_emit(buf, "%llu\n", state.period); +} + +static ssize_t period_store(struct device *pwm_dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + struct pwm_export *export = pwmexport_from_dev(pwm_dev); + struct pwm_device *pwm = export->pwm; + struct pwm_state state; + u64 val; + int ret; + + ret = kstrtou64(buf, 0, &val); + if (ret) + return ret; + + mutex_lock(&export->lock); + pwm_get_state(pwm, &state); + state.period = val; + ret = pwm_apply_might_sleep(pwm, &state); + mutex_unlock(&export->lock); + + return ret ? : size; +} + +static ssize_t duty_cycle_show(struct device *pwm_dev, + struct device_attribute *attr, + char *buf) +{ + const struct pwm_device *pwm = pwm_from_dev(pwm_dev); + struct pwm_state state; + + pwm_get_state(pwm, &state); + + return sysfs_emit(buf, "%llu\n", state.duty_cycle); +} + +static ssize_t duty_cycle_store(struct device *pwm_dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + struct pwm_export *export = pwmexport_from_dev(pwm_dev); + struct pwm_device *pwm = export->pwm; + struct pwm_state state; + u64 val; + int ret; + + ret = kstrtou64(buf, 0, &val); + if (ret) + return ret; + + mutex_lock(&export->lock); + pwm_get_state(pwm, &state); + state.duty_cycle = val; + ret = pwm_apply_might_sleep(pwm, &state); + mutex_unlock(&export->lock); + + return ret ? : size; +} + +static ssize_t enable_show(struct device *pwm_dev, + struct device_attribute *attr, + char *buf) +{ + const struct pwm_device *pwm = pwm_from_dev(pwm_dev); + struct pwm_state state; + + pwm_get_state(pwm, &state); + + return sysfs_emit(buf, "%d\n", state.enabled); +} + +static ssize_t enable_store(struct device *pwm_dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + struct pwm_export *export = pwmexport_from_dev(pwm_dev); + struct pwm_device *pwm = export->pwm; + struct pwm_state state; + int val, ret; + + ret = kstrtoint(buf, 0, &val); + if (ret) + return ret; + + mutex_lock(&export->lock); + + pwm_get_state(pwm, &state); + + switch (val) { + case 0: + state.enabled = false; + break; + case 1: + state.enabled = true; + break; + default: + ret = -EINVAL; + goto unlock; + } + + ret = pwm_apply_might_sleep(pwm, &state); + +unlock: + mutex_unlock(&export->lock); + return ret ? : size; +} + +static ssize_t polarity_show(struct device *pwm_dev, + struct device_attribute *attr, + char *buf) +{ + const struct pwm_device *pwm = pwm_from_dev(pwm_dev); + const char *polarity = "unknown"; + struct pwm_state state; + + pwm_get_state(pwm, &state); + + switch (state.polarity) { + case PWM_POLARITY_NORMAL: + polarity = "normal"; + break; + + case PWM_POLARITY_INVERSED: + polarity = "inversed"; + break; + } + + return sysfs_emit(buf, "%s\n", polarity); +} + +static ssize_t polarity_store(struct device *pwm_dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + struct pwm_export *export = pwmexport_from_dev(pwm_dev); + struct pwm_device *pwm = export->pwm; + enum pwm_polarity polarity; + struct pwm_state state; + int ret; + + if (sysfs_streq(buf, "normal")) + polarity = PWM_POLARITY_NORMAL; + else if (sysfs_streq(buf, "inversed")) + polarity = PWM_POLARITY_INVERSED; + else + return -EINVAL; + + mutex_lock(&export->lock); + pwm_get_state(pwm, &state); + state.polarity = polarity; + ret = pwm_apply_might_sleep(pwm, &state); + mutex_unlock(&export->lock); + + return ret ? : size; +} + +static ssize_t capture_show(struct device *pwm_dev, + struct device_attribute *attr, + char *buf) +{ + struct pwm_device *pwm = pwm_from_dev(pwm_dev); + struct pwm_capture result; + int ret; + + ret = pwm_capture(pwm, &result, jiffies_to_msecs(HZ)); + if (ret) + return ret; + + return sysfs_emit(buf, "%u %u\n", result.period, result.duty_cycle); +} + +static DEVICE_ATTR_RW(period); +static DEVICE_ATTR_RW(duty_cycle); +static DEVICE_ATTR_RW(enable); +static DEVICE_ATTR_RW(polarity); +static DEVICE_ATTR_RO(capture); + +static struct attribute *pwm_attrs[] = { + &dev_attr_period.attr, + &dev_attr_duty_cycle.attr, + &dev_attr_enable.attr, + &dev_attr_polarity.attr, + &dev_attr_capture.attr, + NULL +}; +ATTRIBUTE_GROUPS(pwm); + +static void pwm_export_release(struct device *pwm_dev) +{ + struct pwm_export *export = pwmexport_from_dev(pwm_dev); + + kfree(export); +} + +static int pwm_export_child(struct device *pwmchip_dev, struct pwm_device *pwm) +{ + struct pwm_export *export; + char *pwm_prop[2]; + int ret; + + if (test_and_set_bit(PWMF_EXPORTED, &pwm->flags)) + return -EBUSY; + + export = kzalloc(sizeof(*export), GFP_KERNEL); + if (!export) { + clear_bit(PWMF_EXPORTED, &pwm->flags); + return -ENOMEM; + } + + export->pwm = pwm; + mutex_init(&export->lock); + + export->pwm_dev.release = pwm_export_release; + export->pwm_dev.parent = pwmchip_dev; + export->pwm_dev.devt = MKDEV(0, 0); + export->pwm_dev.groups = pwm_groups; + dev_set_name(&export->pwm_dev, "pwm%u", pwm->hwpwm); + + ret = device_register(&export->pwm_dev); + if (ret) { + clear_bit(PWMF_EXPORTED, &pwm->flags); + put_device(&export->pwm_dev); + export = NULL; + return ret; + } + pwm_prop[0] = kasprintf(GFP_KERNEL, "EXPORT=pwm%u", pwm->hwpwm); + pwm_prop[1] = NULL; + kobject_uevent_env(&pwmchip_dev->kobj, KOBJ_CHANGE, pwm_prop); + kfree(pwm_prop[0]); + + return 0; +} + +static int pwm_unexport_match(struct device *pwm_dev, void *data) +{ + return pwm_from_dev(pwm_dev) == data; +} + +static int pwm_unexport_child(struct device *pwmchip_dev, struct pwm_device *pwm) +{ + struct device *pwm_dev; + char *pwm_prop[2]; + + if (!test_and_clear_bit(PWMF_EXPORTED, &pwm->flags)) + return -ENODEV; + + pwm_dev = device_find_child(pwmchip_dev, pwm, pwm_unexport_match); + if (!pwm_dev) + return -ENODEV; + + pwm_prop[0] = kasprintf(GFP_KERNEL, "UNEXPORT=pwm%u", pwm->hwpwm); + pwm_prop[1] = NULL; + kobject_uevent_env(&pwmchip_dev->kobj, KOBJ_CHANGE, pwm_prop); + kfree(pwm_prop[0]); + + /* for device_find_child() */ + put_device(pwm_dev); + device_unregister(pwm_dev); + pwm_put(pwm); + + return 0; +} + +static ssize_t export_store(struct device *pwmchip_dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct pwm_chip *chip = pwmchip_from_dev(pwmchip_dev); + struct pwm_device *pwm; + unsigned int hwpwm; + int ret; + + ret = kstrtouint(buf, 0, &hwpwm); + if (ret < 0) + return ret; + + if (hwpwm >= chip->npwm) + return -ENODEV; + + pwm = pwm_request_from_chip(chip, hwpwm, "sysfs"); + if (IS_ERR(pwm)) + return PTR_ERR(pwm); + + ret = pwm_export_child(pwmchip_dev, pwm); + if (ret < 0) + pwm_put(pwm); + + return ret ? : len; +} +static DEVICE_ATTR_WO(export); + +static ssize_t unexport_store(struct device *pwmchip_dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct pwm_chip *chip = pwmchip_from_dev(pwmchip_dev); + unsigned int hwpwm; + int ret; + + ret = kstrtouint(buf, 0, &hwpwm); + if (ret < 0) + return ret; + + if (hwpwm >= chip->npwm) + return -ENODEV; + + ret = pwm_unexport_child(pwmchip_dev, &chip->pwms[hwpwm]); + + return ret ? : len; +} +static DEVICE_ATTR_WO(unexport); + +static ssize_t npwm_show(struct device *pwmchip_dev, struct device_attribute *attr, + char *buf) +{ + const struct pwm_chip *chip = pwmchip_from_dev(pwmchip_dev); + + return sysfs_emit(buf, "%u\n", chip->npwm); +} +static DEVICE_ATTR_RO(npwm); + +static struct attribute *pwm_chip_attrs[] = { + &dev_attr_export.attr, + &dev_attr_unexport.attr, + &dev_attr_npwm.attr, + NULL, +}; +ATTRIBUTE_GROUPS(pwm_chip); + +/* takes export->lock on success */ +static struct pwm_export *pwm_class_get_state(struct device *pwmchip_dev, + struct pwm_device *pwm, + struct pwm_state *state) +{ + struct device *pwm_dev; + struct pwm_export *export; + + if (!test_bit(PWMF_EXPORTED, &pwm->flags)) + return NULL; + + pwm_dev = device_find_child(pwmchip_dev, pwm, pwm_unexport_match); + if (!pwm_dev) + return NULL; + + export = pwmexport_from_dev(pwm_dev); + put_device(pwm_dev); /* for device_find_child() */ + + mutex_lock(&export->lock); + pwm_get_state(pwm, state); + + return export; +} + +static int pwm_class_apply_state(struct pwm_export *export, + struct pwm_device *pwm, + struct pwm_state *state) +{ + int ret = pwm_apply_might_sleep(pwm, state); + + /* release lock taken in pwm_class_get_state */ + mutex_unlock(&export->lock); + + return ret; +} + +static int pwm_class_resume_npwm(struct device *pwmchip_dev, unsigned int npwm) +{ + struct pwm_chip *chip = pwmchip_from_dev(pwmchip_dev); + unsigned int i; + int ret = 0; + + for (i = 0; i < npwm; i++) { + struct pwm_device *pwm = &chip->pwms[i]; + struct pwm_state state; + struct pwm_export *export; + + export = pwm_class_get_state(pwmchip_dev, pwm, &state); + if (!export) + continue; + + /* If pwmchip was not enabled before suspend, do nothing. */ + if (!export->suspend.enabled) { + /* release lock taken in pwm_class_get_state */ + mutex_unlock(&export->lock); + continue; + } + + state.enabled = export->suspend.enabled; + ret = pwm_class_apply_state(export, pwm, &state); + if (ret < 0) + break; + } + + return ret; +} + +static int pwm_class_suspend(struct device *pwmchip_dev) +{ + struct pwm_chip *chip = pwmchip_from_dev(pwmchip_dev); + unsigned int i; + int ret = 0; + + for (i = 0; i < chip->npwm; i++) { + struct pwm_device *pwm = &chip->pwms[i]; + struct pwm_state state; + struct pwm_export *export; + + export = pwm_class_get_state(pwmchip_dev, pwm, &state); + if (!export) + continue; + + /* + * If pwmchip was not enabled before suspend, save + * state for resume time and do nothing else. + */ + export->suspend = state; + if (!state.enabled) { + /* release lock taken in pwm_class_get_state */ + mutex_unlock(&export->lock); + continue; + } + + state.enabled = false; + ret = pwm_class_apply_state(export, pwm, &state); + if (ret < 0) { + /* + * roll back the PWM devices that were disabled by + * this suspend function. + */ + pwm_class_resume_npwm(pwmchip_dev, i); + break; + } + } + + return ret; +} + +static int pwm_class_resume(struct device *pwmchip_dev) +{ + struct pwm_chip *chip = pwmchip_from_dev(pwmchip_dev); + + return pwm_class_resume_npwm(pwmchip_dev, chip->npwm); +} + +static DEFINE_SIMPLE_DEV_PM_OPS(pwm_class_pm_ops, pwm_class_suspend, pwm_class_resume); + +static struct class pwm_class = { + .name = "pwm", + .dev_groups = pwm_chip_groups, + .pm = pm_sleep_ptr(&pwm_class_pm_ops), +}; + +static void pwmchip_sysfs_unexport(struct pwm_chip *chip) +{ + unsigned int i; + + for (i = 0; i < chip->npwm; i++) { + struct pwm_device *pwm = &chip->pwms[i]; + + if (test_bit(PWMF_EXPORTED, &pwm->flags)) + pwm_unexport_child(&chip->dev, pwm); + } +} + #define PWMCHIP_ALIGN ARCH_DMA_MINALIGN static void *pwmchip_priv(struct pwm_chip *chip) { - return (void *)chip + ALIGN(sizeof(*chip), PWMCHIP_ALIGN); + return (void *)chip + ALIGN(struct_size(chip, pwms, chip->npwm), PWMCHIP_ALIGN); } /* This is the counterpart to pwmchip_alloc() */ void pwmchip_put(struct pwm_chip *chip) { - kfree(chip); + put_device(&chip->dev); } EXPORT_SYMBOL_GPL(pwmchip_put); +static void pwmchip_release(struct device *pwmchip_dev) +{ + struct pwm_chip *chip = pwmchip_from_dev(pwmchip_dev); + + kfree(chip); +} + struct pwm_chip *pwmchip_alloc(struct device *parent, unsigned int npwm, size_t sizeof_priv) { struct pwm_chip *chip; + struct device *pwmchip_dev; size_t alloc_size; + unsigned int i; - alloc_size = size_add(ALIGN(sizeof(*chip), PWMCHIP_ALIGN), sizeof_priv); + alloc_size = size_add(ALIGN(struct_size(chip, pwms, npwm), PWMCHIP_ALIGN), + sizeof_priv); chip = kzalloc(alloc_size, GFP_KERNEL); if (!chip) return ERR_PTR(-ENOMEM); - chip->dev = parent; chip->npwm = npwm; + chip->uses_pwmchip_alloc = true; + + pwmchip_dev = &chip->dev; + device_initialize(pwmchip_dev); + pwmchip_dev->class = &pwm_class; + pwmchip_dev->parent = parent; + pwmchip_dev->release = pwmchip_release; pwmchip_set_drvdata(chip, pwmchip_priv(chip)); + for (i = 0; i < chip->npwm; i++) { + struct pwm_device *pwm = &chip->pwms[i]; + pwm->chip = chip; + pwm->hwpwm = i; + } + return chip; } EXPORT_SYMBOL_GPL(pwmchip_alloc); @@ -555,47 +1083,56 @@ static bool pwm_ops_check(const struct pwm_chip *chip) */ int __pwmchip_add(struct pwm_chip *chip, struct module *owner) { - unsigned int i; int ret; if (!chip || !pwmchip_parent(chip) || !chip->ops || !chip->npwm) return -EINVAL; + /* + * a struct pwm_chip must be allocated using (devm_)pwmchip_alloc, + * otherwise the embedded struct device might disappear too early + * resulting in memory corruption. + * Catch drivers that were not converted appropriately. + */ + if (!chip->uses_pwmchip_alloc) + return -EINVAL; + if (!pwm_ops_check(chip)) return -EINVAL; chip->owner = owner; - chip->pwms = kcalloc(chip->npwm, sizeof(*chip->pwms), GFP_KERNEL); - if (!chip->pwms) - return -ENOMEM; - mutex_lock(&pwm_lock); ret = idr_alloc(&pwm_chips, chip, 0, 0, GFP_KERNEL); - if (ret < 0) { - mutex_unlock(&pwm_lock); - kfree(chip->pwms); - return ret; - } + if (ret < 0) + goto err_idr_alloc; chip->id = ret; - for (i = 0; i < chip->npwm; i++) { - struct pwm_device *pwm = &chip->pwms[i]; + dev_set_name(&chip->dev, "pwmchip%u", chip->id); - pwm->chip = chip; - pwm->hwpwm = i; - } + if (IS_ENABLED(CONFIG_OF)) + of_pwmchip_add(chip); + + ret = device_add(&chip->dev); + if (ret) + goto err_device_add; mutex_unlock(&pwm_lock); + return 0; + +err_device_add: if (IS_ENABLED(CONFIG_OF)) - of_pwmchip_add(chip); + of_pwmchip_remove(chip); - pwmchip_sysfs_export(chip); + idr_remove(&pwm_chips, chip->id); +err_idr_alloc: - return 0; + mutex_unlock(&pwm_lock); + + return ret; } EXPORT_SYMBOL_GPL(__pwmchip_add); @@ -618,7 +1155,7 @@ void pwmchip_remove(struct pwm_chip *chip) mutex_unlock(&pwm_lock); - kfree(chip->pwms); + device_del(&chip->dev); } EXPORT_SYMBOL_GPL(pwmchip_remove); @@ -988,9 +1525,13 @@ EXPORT_SYMBOL_GPL(pwm_get); */ void pwm_put(struct pwm_device *pwm) { + struct pwm_chip *chip; + if (!pwm) return; + chip = pwm->chip; + mutex_lock(&pwm_lock); if (!test_and_clear_bit(PWMF_REQUESTED, &pwm->flags)) { @@ -998,12 +1539,14 @@ void pwm_put(struct pwm_device *pwm) goto out; } - if (pwm->chip->ops->free) + if (chip->ops->free) pwm->chip->ops->free(pwm->chip, pwm); pwm->label = NULL; - module_put(pwm->chip->owner); + put_device(&chip->dev); + + module_put(chip->owner); out: mutex_unlock(&pwm_lock); } @@ -1076,7 +1619,6 @@ struct pwm_device *devm_fwnode_pwm_get(struct device *dev, } EXPORT_SYMBOL_GPL(devm_fwnode_pwm_get); -#ifdef CONFIG_DEBUG_FS static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s) { unsigned int i; @@ -1161,11 +1703,11 @@ static const struct seq_operations pwm_debugfs_sops = { DEFINE_SEQ_ATTRIBUTE(pwm_debugfs); -static int __init pwm_debugfs_init(void) +static int __init pwm_init(void) { - debugfs_create_file("pwm", 0444, NULL, NULL, &pwm_debugfs_fops); + if (IS_ENABLED(CONFIG_DEBUG_FS)) + debugfs_create_file("pwm", 0444, NULL, NULL, &pwm_debugfs_fops); - return 0; + return class_register(&pwm_class); } -subsys_initcall(pwm_debugfs_init); -#endif /* CONFIG_DEBUG_FS */ +subsys_initcall(pwm_init); diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c index aa35acbb0cbc..578e95e0296c 100644 --- a/drivers/pwm/pwm-bcm2835.c +++ b/drivers/pwm/pwm-bcm2835.c @@ -124,20 +124,14 @@ static const struct pwm_ops bcm2835_pwm_ops = { .apply = bcm2835_pwm_apply, }; -static void devm_clk_rate_exclusive_put(void *data) -{ - struct clk *clk = data; - - clk_rate_exclusive_put(clk); -} - static int bcm2835_pwm_probe(struct platform_device *pdev) { + struct device *dev = &pdev->dev; struct pwm_chip *chip; struct bcm2835_pwm *pc; int ret; - chip = devm_pwmchip_alloc(&pdev->dev, 2, sizeof(*pc)); + chip = devm_pwmchip_alloc(dev, 2, sizeof(*pc)); if (IS_ERR(chip)) return PTR_ERR(chip); pc = to_bcm2835_pwm(chip); @@ -146,24 +140,19 @@ static int bcm2835_pwm_probe(struct platform_device *pdev) if (IS_ERR(pc->base)) return PTR_ERR(pc->base); - pc->clk = devm_clk_get_enabled(&pdev->dev, NULL); + pc->clk = devm_clk_get_enabled(dev, NULL); if (IS_ERR(pc->clk)) - return dev_err_probe(&pdev->dev, PTR_ERR(pc->clk), + return dev_err_probe(dev, PTR_ERR(pc->clk), "clock not found\n"); - ret = clk_rate_exclusive_get(pc->clk); + ret = devm_clk_rate_exclusive_get(dev, pc->clk); if (ret) - return dev_err_probe(&pdev->dev, ret, + return dev_err_probe(dev, ret, "fail to get exclusive rate\n"); - ret = devm_add_action_or_reset(&pdev->dev, devm_clk_rate_exclusive_put, - pc->clk); - if (ret) - return ret; - pc->rate = clk_get_rate(pc->clk); if (!pc->rate) - return dev_err_probe(&pdev->dev, -EINVAL, + return dev_err_probe(dev, -EINVAL, "failed to get clock rate\n"); chip->ops = &bcm2835_pwm_ops; @@ -171,10 +160,9 @@ static int bcm2835_pwm_probe(struct platform_device *pdev) platform_set_drvdata(pdev, pc); - ret = devm_pwmchip_add(&pdev->dev, chip); + ret = devm_pwmchip_add(dev, chip); if (ret < 0) - return dev_err_probe(&pdev->dev, ret, - "failed to add pwmchip\n"); + return dev_err_probe(dev, ret, "failed to add pwmchip\n"); return 0; } diff --git a/drivers/pwm/pwm-dwc-core.c b/drivers/pwm/pwm-dwc-core.c index 043736972cb9..c8425493b95d 100644 --- a/drivers/pwm/pwm-dwc-core.c +++ b/drivers/pwm/pwm-dwc-core.c @@ -172,7 +172,6 @@ struct pwm_chip *dwc_pwm_alloc(struct device *dev) dwc->clk_ns = 10; chip->ops = &dwc_pwm_ops; - dev_set_drvdata(dev, chip); return chip; } EXPORT_SYMBOL_GPL(dwc_pwm_alloc); diff --git a/drivers/pwm/pwm-dwc.c b/drivers/pwm/pwm-dwc.c index 676eaf8d7a53..fb3eadf6fbc4 100644 --- a/drivers/pwm/pwm-dwc.c +++ b/drivers/pwm/pwm-dwc.c @@ -31,26 +31,34 @@ static const struct dwc_pwm_info ehl_pwm_info = { .size = 0x1000, }; -static int dwc_pwm_init_one(struct device *dev, void __iomem *base, unsigned int offset) +static int dwc_pwm_init_one(struct device *dev, struct dwc_pwm_drvdata *ddata, unsigned int idx) { struct pwm_chip *chip; struct dwc_pwm *dwc; + int ret; chip = dwc_pwm_alloc(dev); if (IS_ERR(chip)) return PTR_ERR(chip); dwc = to_dwc_pwm(chip); - dwc->base = base + offset; + dwc->base = ddata->io_base + (ddata->info->size * idx); - return devm_pwmchip_add(dev, chip); + ret = devm_pwmchip_add(dev, chip); + if (ret) + return ret; + + ddata->chips[idx] = chip; + return 0; } static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id) { const struct dwc_pwm_info *info; struct device *dev = &pci->dev; - int i, ret; + struct dwc_pwm_drvdata *ddata; + unsigned int idx; + int ret; ret = pcim_enable_device(pci); if (ret) @@ -63,17 +71,25 @@ static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id) return dev_err_probe(dev, ret, "Failed to iomap PCI BAR\n"); info = (const struct dwc_pwm_info *)id->driver_data; - - for (i = 0; i < info->nr; i++) { - /* - * No need to check for pcim_iomap_table() failure, - * pcim_iomap_regions() already does it for us. - */ - ret = dwc_pwm_init_one(dev, pcim_iomap_table(pci)[0], i * info->size); + ddata = devm_kzalloc(dev, struct_size(ddata, chips, info->nr), GFP_KERNEL); + if (!ddata) + return -ENOMEM; + + /* + * No need to check for pcim_iomap_table() failure, + * pcim_iomap_regions() already does it for us. + */ + ddata->io_base = pcim_iomap_table(pci)[0]; + ddata->info = info; + + for (idx = 0; idx < ddata->info->nr; idx++) { + ret = dwc_pwm_init_one(dev, ddata, idx); if (ret) return ret; } + dev_set_drvdata(dev, ddata); + pm_runtime_put(dev); pm_runtime_allow(dev); @@ -88,19 +104,24 @@ static void dwc_pwm_remove(struct pci_dev *pci) static int dwc_pwm_suspend(struct device *dev) { - struct pwm_chip *chip = dev_get_drvdata(dev); - struct dwc_pwm *dwc = to_dwc_pwm(chip); - int i; - - for (i = 0; i < DWC_TIMERS_TOTAL; i++) { - if (chip->pwms[i].state.enabled) { - dev_err(dev, "PWM %u in use by consumer (%s)\n", - i, chip->pwms[i].label); - return -EBUSY; + struct dwc_pwm_drvdata *ddata = dev_get_drvdata(dev); + unsigned int idx; + + for (idx = 0; idx < ddata->info->nr; idx++) { + struct pwm_chip *chip = ddata->chips[idx]; + struct dwc_pwm *dwc = to_dwc_pwm(chip); + unsigned int i; + + for (i = 0; i < DWC_TIMERS_TOTAL; i++) { + if (chip->pwms[i].state.enabled) { + dev_err(dev, "PWM %u in use by consumer (%s)\n", + i, chip->pwms[i].label); + return -EBUSY; + } + dwc->ctx[i].cnt = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT(i)); + dwc->ctx[i].cnt2 = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT2(i)); + dwc->ctx[i].ctrl = dwc_pwm_readl(dwc, DWC_TIM_CTRL(i)); } - dwc->ctx[i].cnt = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT(i)); - dwc->ctx[i].cnt2 = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT2(i)); - dwc->ctx[i].ctrl = dwc_pwm_readl(dwc, DWC_TIM_CTRL(i)); } return 0; @@ -108,14 +129,19 @@ static int dwc_pwm_suspend(struct device *dev) static int dwc_pwm_resume(struct device *dev) { - struct pwm_chip *chip = dev_get_drvdata(dev); - struct dwc_pwm *dwc = to_dwc_pwm(chip); - int i; - - for (i = 0; i < DWC_TIMERS_TOTAL; i++) { - dwc_pwm_writel(dwc, dwc->ctx[i].cnt, DWC_TIM_LD_CNT(i)); - dwc_pwm_writel(dwc, dwc->ctx[i].cnt2, DWC_TIM_LD_CNT2(i)); - dwc_pwm_writel(dwc, dwc->ctx[i].ctrl, DWC_TIM_CTRL(i)); + struct dwc_pwm_drvdata *ddata = dev_get_drvdata(dev); + unsigned int idx; + + for (idx = 0; idx < ddata->info->nr; idx++) { + struct pwm_chip *chip = ddata->chips[idx]; + struct dwc_pwm *dwc = to_dwc_pwm(chip); + unsigned int i; + + for (i = 0; i < DWC_TIMERS_TOTAL; i++) { + dwc_pwm_writel(dwc, dwc->ctx[i].cnt, DWC_TIM_LD_CNT(i)); + dwc_pwm_writel(dwc, dwc->ctx[i].cnt2, DWC_TIM_LD_CNT2(i)); + dwc_pwm_writel(dwc, dwc->ctx[i].ctrl, DWC_TIM_CTRL(i)); + } } return 0; diff --git a/drivers/pwm/pwm-dwc.h b/drivers/pwm/pwm-dwc.h index a8b074841ae8..c6e2df5a6122 100644 --- a/drivers/pwm/pwm-dwc.h +++ b/drivers/pwm/pwm-dwc.h @@ -38,6 +38,12 @@ struct dwc_pwm_info { unsigned int size; }; +struct dwc_pwm_drvdata { + const struct dwc_pwm_info *info; + void __iomem *io_base; + struct pwm_chip *chips[]; +}; + struct dwc_pwm_ctx { u32 cnt; u32 cnt2; diff --git a/drivers/pwm/pwm-img.c b/drivers/pwm/pwm-img.c index d79a96679a26..d6596583ed4e 100644 --- a/drivers/pwm/pwm-img.c +++ b/drivers/pwm/pwm-img.c @@ -284,9 +284,9 @@ static int img_pwm_probe(struct platform_device *pdev) return PTR_ERR(imgchip->sys_clk); } - imgchip->pwm_clk = devm_clk_get(&pdev->dev, "imgchip"); + imgchip->pwm_clk = devm_clk_get(&pdev->dev, "pwm"); if (IS_ERR(imgchip->pwm_clk)) { - dev_err(&pdev->dev, "failed to get imgchip clock\n"); + dev_err(&pdev->dev, "failed to get pwm clock\n"); return PTR_ERR(imgchip->pwm_clk); } diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c index a02fdbc61256..b2f97dfb01bb 100644 --- a/drivers/pwm/pwm-meson.c +++ b/drivers/pwm/pwm-meson.c @@ -98,6 +98,7 @@ struct meson_pwm_channel { struct meson_pwm_data { const char *const parent_names[MESON_NUM_MUX_PARENTS]; + int (*channels_init)(struct pwm_chip *chip); }; struct meson_pwm { @@ -147,7 +148,7 @@ static int meson_pwm_calc(struct pwm_chip *chip, struct pwm_device *pwm, struct meson_pwm *meson = to_meson_pwm(chip); struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm]; unsigned int cnt, duty_cnt; - unsigned long fin_freq; + long fin_freq; u64 duty, period, freq; duty = state->duty_cycle; @@ -167,14 +168,15 @@ static int meson_pwm_calc(struct pwm_chip *chip, struct pwm_device *pwm, freq = ULONG_MAX; fin_freq = clk_round_rate(channel->clk, freq); - if (fin_freq == 0) { - dev_err(pwmchip_parent(chip), "invalid source clock frequency\n"); - return -EINVAL; + if (fin_freq <= 0) { + dev_err(pwmchip_parent(chip), + "invalid source clock frequency %llu\n", freq); + return fin_freq ? fin_freq : -EINVAL; } - dev_dbg(pwmchip_parent(chip), "fin_freq: %lu Hz\n", fin_freq); + dev_dbg(pwmchip_parent(chip), "fin_freq: %ld Hz\n", fin_freq); - cnt = div_u64(fin_freq * period, NSEC_PER_SEC); + cnt = mul_u64_u64_div_u64(fin_freq, period, NSEC_PER_SEC); if (cnt > 0xffff) { dev_err(pwmchip_parent(chip), "unable to get period cnt\n"); return -EINVAL; @@ -189,7 +191,7 @@ static int meson_pwm_calc(struct pwm_chip *chip, struct pwm_device *pwm, channel->hi = 0; channel->lo = cnt; } else { - duty_cnt = div_u64(fin_freq * duty, NSEC_PER_SEC); + duty_cnt = mul_u64_u64_div_u64(fin_freq, duty, NSEC_PER_SEC); dev_dbg(pwmchip_parent(chip), "duty=%llu duty_cnt=%u\n", duty, duty_cnt); @@ -310,9 +312,6 @@ static int meson_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, struct meson_pwm_channel *channel; u32 value; - if (!state) - return 0; - channel = &meson->channels[pwm->hwpwm]; channel_data = &meson_pwm_per_channel_data[pwm->hwpwm]; @@ -338,86 +337,16 @@ static const struct pwm_ops meson_pwm_ops = { .get_state = meson_pwm_get_state, }; -static const struct meson_pwm_data pwm_meson8b_data = { - .parent_names = { "xtal", NULL, "fclk_div4", "fclk_div3" }, -}; - -/* - * Only the 2 first inputs of the GXBB AO PWMs are valid - * The last 2 are grounded - */ -static const struct meson_pwm_data pwm_gxbb_ao_data = { - .parent_names = { "xtal", "clk81", NULL, NULL }, -}; - -static const struct meson_pwm_data pwm_axg_ee_data = { - .parent_names = { "xtal", "fclk_div5", "fclk_div4", "fclk_div3" }, -}; - -static const struct meson_pwm_data pwm_axg_ao_data = { - .parent_names = { "xtal", "axg_ao_clk81", "fclk_div4", "fclk_div5" }, -}; - -static const struct meson_pwm_data pwm_g12a_ao_ab_data = { - .parent_names = { "xtal", "g12a_ao_clk81", "fclk_div4", "fclk_div5" }, -}; - -static const struct meson_pwm_data pwm_g12a_ao_cd_data = { - .parent_names = { "xtal", "g12a_ao_clk81", NULL, NULL }, -}; - -static const struct of_device_id meson_pwm_matches[] = { - { - .compatible = "amlogic,meson8b-pwm", - .data = &pwm_meson8b_data - }, - { - .compatible = "amlogic,meson-gxbb-pwm", - .data = &pwm_meson8b_data - }, - { - .compatible = "amlogic,meson-gxbb-ao-pwm", - .data = &pwm_gxbb_ao_data - }, - { - .compatible = "amlogic,meson-axg-ee-pwm", - .data = &pwm_axg_ee_data - }, - { - .compatible = "amlogic,meson-axg-ao-pwm", - .data = &pwm_axg_ao_data - }, - { - .compatible = "amlogic,meson-g12a-ee-pwm", - .data = &pwm_meson8b_data - }, - { - .compatible = "amlogic,meson-g12a-ao-pwm-ab", - .data = &pwm_g12a_ao_ab_data - }, - { - .compatible = "amlogic,meson-g12a-ao-pwm-cd", - .data = &pwm_g12a_ao_cd_data - }, - {}, -}; -MODULE_DEVICE_TABLE(of, meson_pwm_matches); - -static int meson_pwm_init_channels(struct pwm_chip *chip) +static int meson_pwm_init_clocks_meson8b(struct pwm_chip *chip, + struct clk_parent_data *mux_parent_data) { struct meson_pwm *meson = to_meson_pwm(chip); - struct clk_parent_data mux_parent_data[MESON_NUM_MUX_PARENTS] = {}; struct device *dev = pwmchip_parent(chip); unsigned int i; char name[255]; int err; - for (i = 0; i < MESON_NUM_MUX_PARENTS; i++) { - mux_parent_data[i].index = -1; - mux_parent_data[i].name = meson->data->parent_names[i]; - } - - for (i = 0; i < chip->npwm; i++) { + for (i = 0; i < MESON_NUM_PWMS; i++) { struct meson_pwm_channel *channel = &meson->channels[i]; struct clk_parent_data div_parent = {}, gate_parent = {}; struct clk_init_data init = {}; @@ -495,6 +424,122 @@ static int meson_pwm_init_channels(struct pwm_chip *chip) return 0; } +static int meson_pwm_init_channels_meson8b_legacy(struct pwm_chip *chip) +{ + struct clk_parent_data mux_parent_data[MESON_NUM_MUX_PARENTS] = {}; + struct meson_pwm *meson = to_meson_pwm(chip); + int i; + + dev_warn_once(pwmchip_parent(chip), + "using obsolete compatible, please consider updating dt\n"); + + for (i = 0; i < MESON_NUM_MUX_PARENTS; i++) { + mux_parent_data[i].index = -1; + mux_parent_data[i].name = meson->data->parent_names[i]; + } + + return meson_pwm_init_clocks_meson8b(chip, mux_parent_data); +} + +static int meson_pwm_init_channels_meson8b_v2(struct pwm_chip *chip) +{ + struct clk_parent_data mux_parent_data[MESON_NUM_MUX_PARENTS] = {}; + int i; + + /* + * NOTE: Instead of relying on the hard coded names in the driver + * as the legacy version, this relies on DT to provide the list of + * clocks. + * For once, using input numbers actually makes more sense than names. + * Also DT requires clock-names to be explicitly ordered, so there is + * no point bothering with clock names in this case. + */ + for (i = 0; i < MESON_NUM_MUX_PARENTS; i++) + mux_parent_data[i].index = i; + + return meson_pwm_init_clocks_meson8b(chip, mux_parent_data); +} + +static const struct meson_pwm_data pwm_meson8b_data = { + .parent_names = { "xtal", NULL, "fclk_div4", "fclk_div3" }, + .channels_init = meson_pwm_init_channels_meson8b_legacy, +}; + +/* + * Only the 2 first inputs of the GXBB AO PWMs are valid + * The last 2 are grounded + */ +static const struct meson_pwm_data pwm_gxbb_ao_data = { + .parent_names = { "xtal", "clk81", NULL, NULL }, + .channels_init = meson_pwm_init_channels_meson8b_legacy, +}; + +static const struct meson_pwm_data pwm_axg_ee_data = { + .parent_names = { "xtal", "fclk_div5", "fclk_div4", "fclk_div3" }, + .channels_init = meson_pwm_init_channels_meson8b_legacy, +}; + +static const struct meson_pwm_data pwm_axg_ao_data = { + .parent_names = { "xtal", "axg_ao_clk81", "fclk_div4", "fclk_div5" }, + .channels_init = meson_pwm_init_channels_meson8b_legacy, +}; + +static const struct meson_pwm_data pwm_g12a_ao_ab_data = { + .parent_names = { "xtal", "g12a_ao_clk81", "fclk_div4", "fclk_div5" }, + .channels_init = meson_pwm_init_channels_meson8b_legacy, +}; + +static const struct meson_pwm_data pwm_g12a_ao_cd_data = { + .parent_names = { "xtal", "g12a_ao_clk81", NULL, NULL }, + .channels_init = meson_pwm_init_channels_meson8b_legacy, +}; + +static const struct meson_pwm_data pwm_meson8_v2_data = { + .channels_init = meson_pwm_init_channels_meson8b_v2, +}; + +static const struct of_device_id meson_pwm_matches[] = { + { + .compatible = "amlogic,meson8-pwm-v2", + .data = &pwm_meson8_v2_data + }, + /* The following compatibles are obsolete */ + { + .compatible = "amlogic,meson8b-pwm", + .data = &pwm_meson8b_data + }, + { + .compatible = "amlogic,meson-gxbb-pwm", + .data = &pwm_meson8b_data + }, + { + .compatible = "amlogic,meson-gxbb-ao-pwm", + .data = &pwm_gxbb_ao_data + }, + { + .compatible = "amlogic,meson-axg-ee-pwm", + .data = &pwm_axg_ee_data + }, + { + .compatible = "amlogic,meson-axg-ao-pwm", + .data = &pwm_axg_ao_data + }, + { + .compatible = "amlogic,meson-g12a-ee-pwm", + .data = &pwm_meson8b_data + }, + { + .compatible = "amlogic,meson-g12a-ao-pwm-ab", + .data = &pwm_g12a_ao_ab_data + }, + { + .compatible = "amlogic,meson-g12a-ao-pwm-cd", + .data = &pwm_g12a_ao_cd_data + }, + {}, +}; +MODULE_DEVICE_TABLE(of, meson_pwm_matches); + static int meson_pwm_probe(struct platform_device *pdev) { struct pwm_chip *chip; @@ -515,7 +560,7 @@ static int meson_pwm_probe(struct platform_device *pdev) meson->data = of_device_get_match_data(&pdev->dev); - err = meson_pwm_init_channels(chip); + err = meson->data->channels_init(chip); if (err < 0) return err; diff --git a/drivers/pwm/pwm-pca9685.c b/drivers/pwm/pwm-pca9685.c index c5da2a6ed846..1298b29183e5 100644 --- a/drivers/pwm/pwm-pca9685.c +++ b/drivers/pwm/pwm-pca9685.c @@ -634,8 +634,8 @@ static int __maybe_unused pca9685_pwm_runtime_resume(struct device *dev) } static const struct i2c_device_id pca9685_id[] = { - { "pca9685", 0 }, - { /* sentinel */ }, + { "pca9685" }, + { /* sentinel */ } }; MODULE_DEVICE_TABLE(i2c, pca9685_id); diff --git a/drivers/pwm/pwm-sti.c b/drivers/pwm/pwm-sti.c index 39d80da0e14a..396b52672ce0 100644 --- a/drivers/pwm/pwm-sti.c +++ b/drivers/pwm/pwm-sti.c @@ -73,21 +73,16 @@ struct sti_cpt_ddata { wait_queue_head_t wait; }; -struct sti_pwm_compat_data { - const struct reg_field *reg_fields; - unsigned int pwm_num_devs; - unsigned int cpt_num_devs; - unsigned int max_pwm_cnt; - unsigned int max_prescale; - struct sti_cpt_ddata *ddata; -}; - struct sti_pwm_chip { struct device *dev; struct clk *pwm_clk; struct clk *cpt_clk; struct regmap *regmap; - struct sti_pwm_compat_data *cdata; + unsigned int pwm_num_devs; + unsigned int cpt_num_devs; + unsigned int max_pwm_cnt; + unsigned int max_prescale; + struct sti_cpt_ddata *ddata; struct regmap_field *prescale_low; struct regmap_field *prescale_high; struct regmap_field *pwm_out_en; @@ -122,7 +117,6 @@ static inline struct sti_pwm_chip *to_sti_pwmchip(struct pwm_chip *chip) static int sti_pwm_get_prescale(struct sti_pwm_chip *pc, unsigned long period, unsigned int *prescale) { - struct sti_pwm_compat_data *cdata = pc->cdata; unsigned long clk_rate; unsigned long value; unsigned int ps; @@ -137,13 +131,13 @@ static int sti_pwm_get_prescale(struct sti_pwm_chip *pc, unsigned long period, * prescale = ((period_ns * clk_rate) / (10^9 * (max_pwm_cnt + 1)) - 1 */ value = NSEC_PER_SEC / clk_rate; - value *= cdata->max_pwm_cnt + 1; + value *= pc->max_pwm_cnt + 1; if (period % value) return -EINVAL; ps = period / value - 1; - if (ps > cdata->max_prescale) + if (ps > pc->max_prescale) return -EINVAL; *prescale = ps; @@ -164,7 +158,6 @@ static int sti_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns) { struct sti_pwm_chip *pc = to_sti_pwmchip(chip); - struct sti_pwm_compat_data *cdata = pc->cdata; unsigned int ncfg, value, prescale = 0; struct pwm_device *cur = pc->cur; struct device *dev = pc->dev; @@ -224,7 +217,7 @@ static int sti_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, * PWM pulse = (max_pwm_count + 1) local cycles, * that is continuous pulse: signal never goes low. */ - value = cdata->max_pwm_cnt * duty_ns / period_ns; + value = pc->max_pwm_cnt * duty_ns / period_ns; ret = regmap_write(pc->regmap, PWM_OUT_VAL(pwm->hwpwm), value); if (ret) @@ -313,14 +306,13 @@ static int sti_pwm_capture(struct pwm_chip *chip, struct pwm_device *pwm, struct pwm_capture *result, unsigned long timeout) { struct sti_pwm_chip *pc = to_sti_pwmchip(chip); - struct sti_pwm_compat_data *cdata = pc->cdata; - struct sti_cpt_ddata *ddata = &cdata->ddata[pwm->hwpwm]; + struct sti_cpt_ddata *ddata = &pc->ddata[pwm->hwpwm]; struct device *dev = pc->dev; unsigned int effective_ticks; unsigned long long high, low; int ret; - if (pwm->hwpwm >= cdata->cpt_num_devs) { + if (pwm->hwpwm >= pc->cpt_num_devs) { dev_err(dev, "device %u is not valid\n", pwm->hwpwm); return -EINVAL; } @@ -395,11 +387,10 @@ static int sti_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { struct sti_pwm_chip *pc = to_sti_pwmchip(chip); - struct sti_pwm_compat_data *cdata = pc->cdata; struct device *dev = pc->dev; int err; - if (pwm->hwpwm >= cdata->pwm_num_devs) { + if (pwm->hwpwm >= pc->pwm_num_devs) { dev_err(dev, "device %u is not valid for pwm mode\n", pwm->hwpwm); return -EINVAL; @@ -448,7 +439,7 @@ static irqreturn_t sti_pwm_interrupt(int irq, void *data) while (cpt_int_stat) { devicenum = ffs(cpt_int_stat) - 1; - ddata = &pc->cdata->ddata[devicenum]; + ddata = &pc->ddata[devicenum]; /* * Capture input: @@ -502,41 +493,37 @@ static irqreturn_t sti_pwm_interrupt(int irq, void *data) return ret; } -static int sti_pwm_probe_dt(struct sti_pwm_chip *pc) +static int sti_pwm_probe_regmap(struct sti_pwm_chip *pc) { struct device *dev = pc->dev; - const struct reg_field *reg_fields; - struct sti_pwm_compat_data *cdata = pc->cdata; - - reg_fields = cdata->reg_fields; pc->prescale_low = devm_regmap_field_alloc(dev, pc->regmap, - reg_fields[PWMCLK_PRESCALE_LOW]); + sti_pwm_regfields[PWMCLK_PRESCALE_LOW]); if (IS_ERR(pc->prescale_low)) return PTR_ERR(pc->prescale_low); pc->prescale_high = devm_regmap_field_alloc(dev, pc->regmap, - reg_fields[PWMCLK_PRESCALE_HIGH]); + sti_pwm_regfields[PWMCLK_PRESCALE_HIGH]); if (IS_ERR(pc->prescale_high)) return PTR_ERR(pc->prescale_high); pc->pwm_out_en = devm_regmap_field_alloc(dev, pc->regmap, - reg_fields[PWM_OUT_EN]); + sti_pwm_regfields[PWM_OUT_EN]); if (IS_ERR(pc->pwm_out_en)) return PTR_ERR(pc->pwm_out_en); pc->pwm_cpt_en = devm_regmap_field_alloc(dev, pc->regmap, - reg_fields[PWM_CPT_EN]); + sti_pwm_regfields[PWM_CPT_EN]); if (IS_ERR(pc->pwm_cpt_en)) return PTR_ERR(pc->pwm_cpt_en); pc->pwm_cpt_int_en = devm_regmap_field_alloc(dev, pc->regmap, - reg_fields[PWM_CPT_INT_EN]); + sti_pwm_regfields[PWM_CPT_INT_EN]); if (IS_ERR(pc->pwm_cpt_int_en)) return PTR_ERR(pc->pwm_cpt_int_en); pc->pwm_cpt_int_stat = devm_regmap_field_alloc(dev, pc->regmap, - reg_fields[PWM_CPT_INT_STAT]); + sti_pwm_regfields[PWM_CPT_INT_STAT]); if (PTR_ERR_OR_ZERO(pc->pwm_cpt_int_stat)) return PTR_ERR(pc->pwm_cpt_int_stat); @@ -556,7 +543,6 @@ static int sti_pwm_probe(struct platform_device *pdev) u32 num_devs; unsigned int pwm_num_devs = 0; unsigned int cpt_num_devs = 0; - struct sti_pwm_compat_data *cdata; struct pwm_chip *chip; struct sti_pwm_chip *pc; unsigned int i; @@ -570,20 +556,14 @@ static int sti_pwm_probe(struct platform_device *pdev) if (!ret) cpt_num_devs = num_devs; - if (!pwm_num_devs && !cpt_num_devs) { - dev_err(dev, "No channels configured\n"); - return -EINVAL; - } + if (!pwm_num_devs && !cpt_num_devs) + return dev_err_probe(dev, -EINVAL, "No channels configured\n"); chip = devm_pwmchip_alloc(dev, max(pwm_num_devs, cpt_num_devs), sizeof(*pc)); if (IS_ERR(chip)) return PTR_ERR(chip); pc = to_sti_pwmchip(chip); - cdata = devm_kzalloc(dev, sizeof(*cdata), GFP_KERNEL); - if (!cdata) - return -ENOMEM; - pc->mmio = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(pc->mmio)) return PTR_ERR(pc->mmio); @@ -591,7 +571,8 @@ static int sti_pwm_probe(struct platform_device *pdev) pc->regmap = devm_regmap_init_mmio(dev, pc->mmio, &sti_pwm_regmap_config); if (IS_ERR(pc->regmap)) - return PTR_ERR(pc->regmap); + return dev_err_probe(dev, PTR_ERR(pc->regmap), + "Failed to initialize regmap\n"); irq = platform_get_irq(pdev, 0); if (irq < 0) @@ -599,94 +580,61 @@ static int sti_pwm_probe(struct platform_device *pdev) ret = devm_request_irq(&pdev->dev, irq, sti_pwm_interrupt, 0, pdev->name, pc); - if (ret < 0) { - dev_err(&pdev->dev, "Failed to request IRQ\n"); - return ret; - } + if (ret < 0) + dev_err_probe(&pdev->dev, ret, "Failed to request IRQ\n"); /* * Setup PWM data with default values: some values could be replaced * with specific ones provided from Device Tree. */ - cdata->reg_fields = sti_pwm_regfields; - cdata->max_prescale = 0xff; - cdata->max_pwm_cnt = 255; - cdata->pwm_num_devs = pwm_num_devs; - cdata->cpt_num_devs = cpt_num_devs; + pc->max_prescale = 0xff; + pc->max_pwm_cnt = 255; + pc->pwm_num_devs = pwm_num_devs; + pc->cpt_num_devs = cpt_num_devs; - pc->cdata = cdata; pc->dev = dev; pc->en_count = 0; mutex_init(&pc->sti_pwm_lock); - ret = sti_pwm_probe_dt(pc); + ret = sti_pwm_probe_regmap(pc); if (ret) - return ret; + return dev_err_probe(dev, ret, "Failed to initialize regmap fields\n"); - if (cdata->pwm_num_devs) { - pc->pwm_clk = of_clk_get_by_name(dev->of_node, "pwm"); - if (IS_ERR(pc->pwm_clk)) { - dev_err(dev, "failed to get PWM clock\n"); - return PTR_ERR(pc->pwm_clk); - } - - ret = clk_prepare(pc->pwm_clk); - if (ret) { - dev_err(dev, "failed to prepare clock\n"); - return ret; - } + if (pwm_num_devs) { + pc->pwm_clk = devm_clk_get_prepared(dev, "pwm"); + if (IS_ERR(pc->pwm_clk)) + return dev_err_probe(dev, PTR_ERR(pc->pwm_clk), + "failed to get PWM clock\n"); } - if (cdata->cpt_num_devs) { - pc->cpt_clk = of_clk_get_by_name(dev->of_node, "capture"); - if (IS_ERR(pc->cpt_clk)) { - dev_err(dev, "failed to get PWM capture clock\n"); - return PTR_ERR(pc->cpt_clk); - } + if (cpt_num_devs) { + pc->cpt_clk = devm_clk_get_prepared(dev, "capture"); + if (IS_ERR(pc->cpt_clk)) + return dev_err_probe(dev, PTR_ERR(pc->cpt_clk), + "failed to get PWM capture clock\n"); - ret = clk_prepare(pc->cpt_clk); - if (ret) { - dev_err(dev, "failed to prepare clock\n"); - return ret; - } - - cdata->ddata = devm_kzalloc(dev, cdata->cpt_num_devs * sizeof(*cdata->ddata), GFP_KERNEL); - if (!cdata->ddata) + pc->ddata = devm_kcalloc(dev, cpt_num_devs, + sizeof(*pc->ddata), GFP_KERNEL); + if (!pc->ddata) return -ENOMEM; - } - chip->ops = &sti_pwm_ops; + for (i = 0; i < cpt_num_devs; i++) { + struct sti_cpt_ddata *ddata = &pc->ddata[i]; - for (i = 0; i < cdata->cpt_num_devs; i++) { - struct sti_cpt_ddata *ddata = &cdata->ddata[i]; - - init_waitqueue_head(&ddata->wait); - mutex_init(&ddata->lock); + init_waitqueue_head(&ddata->wait); + mutex_init(&ddata->lock); + } } - ret = pwmchip_add(chip); - if (ret < 0) { - clk_unprepare(pc->pwm_clk); - clk_unprepare(pc->cpt_clk); - return ret; - } + chip->ops = &sti_pwm_ops; - platform_set_drvdata(pdev, chip); + ret = devm_pwmchip_add(dev, chip); + if (ret) + return dev_err_probe(dev, ret, "Failed to register pwm chip\n"); return 0; } -static void sti_pwm_remove(struct platform_device *pdev) -{ - struct pwm_chip *chip = platform_get_drvdata(pdev); - struct sti_pwm_chip *pc = to_sti_pwmchip(chip); - - pwmchip_remove(chip); - - clk_unprepare(pc->pwm_clk); - clk_unprepare(pc->cpt_clk); -} - static const struct of_device_id sti_pwm_of_match[] = { { .compatible = "st,sti-pwm", }, { /* sentinel */ } @@ -699,7 +647,6 @@ static struct platform_driver sti_pwm_driver = { .of_match_table = sti_pwm_of_match, }, .probe = sti_pwm_probe, - .remove_new = sti_pwm_remove, }; module_platform_driver(sti_pwm_driver); diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c index 0c028d17c075..a2f231d13a9f 100644 --- a/drivers/pwm/pwm-stm32.c +++ b/drivers/pwm/pwm-stm32.c @@ -309,29 +309,35 @@ unlock: } static int stm32_pwm_config(struct stm32_pwm *priv, unsigned int ch, - int duty_ns, int period_ns) + u64 duty_ns, u64 period_ns) { - unsigned long long prd, div, dty; - unsigned int prescaler = 0; + unsigned long long prd, dty; + unsigned long long prescaler; u32 ccmr, mask, shift; - /* Period and prescaler values depends on clock rate */ - div = (unsigned long long)clk_get_rate(priv->clk) * period_ns; - - do_div(div, NSEC_PER_SEC); - prd = div; - - while (div > priv->max_arr) { - prescaler++; - div = prd; - do_div(div, prescaler + 1); - } + /* + * .probe() asserted that clk_get_rate() is not bigger than 1 GHz, so + * the calculations here won't overflow. + * First we need to find the minimal value for prescaler such that + * + * period_ns * clkrate + * ------------------------------ + * NSEC_PER_SEC * (prescaler + 1) + * + * isn't bigger than max_arr. + */ - prd = div; + prescaler = mul_u64_u64_div_u64(period_ns, clk_get_rate(priv->clk), + (u64)NSEC_PER_SEC * priv->max_arr); + if (prescaler > 0) + prescaler -= 1; if (prescaler > MAX_TIM_PSC) return -EINVAL; + prd = mul_u64_u64_div_u64(period_ns, clk_get_rate(priv->clk), + (u64)NSEC_PER_SEC * (prescaler + 1)); + /* * All channels share the same prescaler and counter so when two * channels are active at the same time we can't change them @@ -351,8 +357,8 @@ static int stm32_pwm_config(struct stm32_pwm *priv, unsigned int ch, regmap_set_bits(priv->regmap, TIM_CR1, TIM_CR1_ARPE); /* Calculate the duty cycles */ - dty = prd * duty_ns; - do_div(dty, period_ns); + dty = mul_u64_u64_div_u64(duty_ns, clk_get_rate(priv->clk), + (u64)NSEC_PER_SEC * (prescaler + 1)); regmap_write(priv->regmap, TIM_CCR1 + 4 * ch, dty); @@ -648,14 +654,27 @@ static int stm32_pwm_probe(struct platform_device *pdev) priv->max_arr = ddata->max_arr; if (!priv->regmap || !priv->clk) - return -EINVAL; + return dev_err_probe(dev, -EINVAL, "Failed to get %s\n", + priv->regmap ? "clk" : "regmap"); ret = stm32_pwm_probe_breakinputs(priv, np); if (ret) - return ret; + return dev_err_probe(dev, ret, + "Failed to configure breakinputs\n"); stm32_pwm_detect_complementary(priv); + ret = devm_clk_rate_exclusive_get(dev, priv->clk); + if (ret) + return dev_err_probe(dev, ret, "Failed to lock clock\n"); + + /* + * With the clk running with not more than 1 GHz the calculations in + * .apply() won't overflow. + */ + if (clk_get_rate(priv->clk) > 1000000000) + return dev_err_probe(dev, -EINVAL, "Failed to lock clock\n"); + chip->ops = &stm32pwm_ops; /* Initialize clock refcount to number of enabled PWM channels. */ @@ -664,7 +683,8 @@ static int stm32_pwm_probe(struct platform_device *pdev) ret = devm_pwmchip_add(dev, chip); if (ret < 0) - return ret; + return dev_err_probe(dev, ret, + "Failed to register pwmchip\n"); platform_set_drvdata(pdev, chip); diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c deleted file mode 100644 index 3f434a771fb5..000000000000 --- a/drivers/pwm/sysfs.c +++ /dev/null @@ -1,545 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * A simple sysfs interface for the generic PWM framework - * - * Copyright (C) 2013 H Hartley Sweeten <hsweeten@visionengravers.com> - * - * Based on previous work by Lars Poeschel <poeschel@lemonage.de> - */ - -#include <linux/device.h> -#include <linux/mutex.h> -#include <linux/err.h> -#include <linux/slab.h> -#include <linux/kdev_t.h> -#include <linux/pwm.h> - -struct pwm_export { - struct device child; - struct pwm_device *pwm; - struct mutex lock; - struct pwm_state suspend; -}; - -static struct pwm_export *child_to_pwm_export(struct device *child) -{ - return container_of(child, struct pwm_export, child); -} - -static struct pwm_device *child_to_pwm_device(struct device *child) -{ - struct pwm_export *export = child_to_pwm_export(child); - - return export->pwm; -} - -static ssize_t period_show(struct device *child, - struct device_attribute *attr, - char *buf) -{ - const struct pwm_device *pwm = child_to_pwm_device(child); - struct pwm_state state; - - pwm_get_state(pwm, &state); - - return sysfs_emit(buf, "%llu\n", state.period); -} - -static ssize_t period_store(struct device *child, - struct device_attribute *attr, - const char *buf, size_t size) -{ - struct pwm_export *export = child_to_pwm_export(child); - struct pwm_device *pwm = export->pwm; - struct pwm_state state; - u64 val; - int ret; - - ret = kstrtou64(buf, 0, &val); - if (ret) - return ret; - - mutex_lock(&export->lock); - pwm_get_state(pwm, &state); - state.period = val; - ret = pwm_apply_might_sleep(pwm, &state); - mutex_unlock(&export->lock); - - return ret ? : size; -} - -static ssize_t duty_cycle_show(struct device *child, - struct device_attribute *attr, - char *buf) -{ - const struct pwm_device *pwm = child_to_pwm_device(child); - struct pwm_state state; - - pwm_get_state(pwm, &state); - - return sysfs_emit(buf, "%llu\n", state.duty_cycle); -} - -static ssize_t duty_cycle_store(struct device *child, - struct device_attribute *attr, - const char *buf, size_t size) -{ - struct pwm_export *export = child_to_pwm_export(child); - struct pwm_device *pwm = export->pwm; - struct pwm_state state; - u64 val; - int ret; - - ret = kstrtou64(buf, 0, &val); - if (ret) - return ret; - - mutex_lock(&export->lock); - pwm_get_state(pwm, &state); - state.duty_cycle = val; - ret = pwm_apply_might_sleep(pwm, &state); - mutex_unlock(&export->lock); - - return ret ? : size; -} - -static ssize_t enable_show(struct device *child, - struct device_attribute *attr, - char *buf) -{ - const struct pwm_device *pwm = child_to_pwm_device(child); - struct pwm_state state; - - pwm_get_state(pwm, &state); - - return sysfs_emit(buf, "%d\n", state.enabled); -} - -static ssize_t enable_store(struct device *child, - struct device_attribute *attr, - const char *buf, size_t size) -{ - struct pwm_export *export = child_to_pwm_export(child); - struct pwm_device *pwm = export->pwm; - struct pwm_state state; - int val, ret; - - ret = kstrtoint(buf, 0, &val); - if (ret) - return ret; - - mutex_lock(&export->lock); - - pwm_get_state(pwm, &state); - - switch (val) { - case 0: - state.enabled = false; - break; - case 1: - state.enabled = true; - break; - default: - ret = -EINVAL; - goto unlock; - } - - ret = pwm_apply_might_sleep(pwm, &state); - -unlock: - mutex_unlock(&export->lock); - return ret ? : size; -} - -static ssize_t polarity_show(struct device *child, - struct device_attribute *attr, - char *buf) -{ - const struct pwm_device *pwm = child_to_pwm_device(child); - const char *polarity = "unknown"; - struct pwm_state state; - - pwm_get_state(pwm, &state); - - switch (state.polarity) { - case PWM_POLARITY_NORMAL: - polarity = "normal"; - break; - - case PWM_POLARITY_INVERSED: - polarity = "inversed"; - break; - } - - return sysfs_emit(buf, "%s\n", polarity); -} - -static ssize_t polarity_store(struct device *child, - struct device_attribute *attr, - const char *buf, size_t size) -{ - struct pwm_export *export = child_to_pwm_export(child); - struct pwm_device *pwm = export->pwm; - enum pwm_polarity polarity; - struct pwm_state state; - int ret; - - if (sysfs_streq(buf, "normal")) - polarity = PWM_POLARITY_NORMAL; - else if (sysfs_streq(buf, "inversed")) - polarity = PWM_POLARITY_INVERSED; - else - return -EINVAL; - - mutex_lock(&export->lock); - pwm_get_state(pwm, &state); - state.polarity = polarity; - ret = pwm_apply_might_sleep(pwm, &state); - mutex_unlock(&export->lock); - - return ret ? : size; -} - -static ssize_t capture_show(struct device *child, - struct device_attribute *attr, - char *buf) -{ - struct pwm_device *pwm = child_to_pwm_device(child); - struct pwm_capture result; - int ret; - - ret = pwm_capture(pwm, &result, jiffies_to_msecs(HZ)); - if (ret) - return ret; - - return sysfs_emit(buf, "%u %u\n", result.period, result.duty_cycle); -} - -static DEVICE_ATTR_RW(period); -static DEVICE_ATTR_RW(duty_cycle); -static DEVICE_ATTR_RW(enable); -static DEVICE_ATTR_RW(polarity); -static DEVICE_ATTR_RO(capture); - -static struct attribute *pwm_attrs[] = { - &dev_attr_period.attr, - &dev_attr_duty_cycle.attr, - &dev_attr_enable.attr, - &dev_attr_polarity.attr, - &dev_attr_capture.attr, - NULL -}; -ATTRIBUTE_GROUPS(pwm); - -static void pwm_export_release(struct device *child) -{ - struct pwm_export *export = child_to_pwm_export(child); - - kfree(export); -} - -static int pwm_export_child(struct device *parent, struct pwm_device *pwm) -{ - struct pwm_export *export; - char *pwm_prop[2]; - int ret; - - if (test_and_set_bit(PWMF_EXPORTED, &pwm->flags)) - return -EBUSY; - - export = kzalloc(sizeof(*export), GFP_KERNEL); - if (!export) { - clear_bit(PWMF_EXPORTED, &pwm->flags); - return -ENOMEM; - } - - export->pwm = pwm; - mutex_init(&export->lock); - - export->child.release = pwm_export_release; - export->child.parent = parent; - export->child.devt = MKDEV(0, 0); - export->child.groups = pwm_groups; - dev_set_name(&export->child, "pwm%u", pwm->hwpwm); - - ret = device_register(&export->child); - if (ret) { - clear_bit(PWMF_EXPORTED, &pwm->flags); - put_device(&export->child); - export = NULL; - return ret; - } - pwm_prop[0] = kasprintf(GFP_KERNEL, "EXPORT=pwm%u", pwm->hwpwm); - pwm_prop[1] = NULL; - kobject_uevent_env(&parent->kobj, KOBJ_CHANGE, pwm_prop); - kfree(pwm_prop[0]); - - return 0; -} - -static int pwm_unexport_match(struct device *child, void *data) -{ - return child_to_pwm_device(child) == data; -} - -static int pwm_unexport_child(struct device *parent, struct pwm_device *pwm) -{ - struct device *child; - char *pwm_prop[2]; - - if (!test_and_clear_bit(PWMF_EXPORTED, &pwm->flags)) - return -ENODEV; - - child = device_find_child(parent, pwm, pwm_unexport_match); - if (!child) - return -ENODEV; - - pwm_prop[0] = kasprintf(GFP_KERNEL, "UNEXPORT=pwm%u", pwm->hwpwm); - pwm_prop[1] = NULL; - kobject_uevent_env(&parent->kobj, KOBJ_CHANGE, pwm_prop); - kfree(pwm_prop[0]); - - /* for device_find_child() */ - put_device(child); - device_unregister(child); - pwm_put(pwm); - - return 0; -} - -static ssize_t export_store(struct device *parent, - struct device_attribute *attr, - const char *buf, size_t len) -{ - struct pwm_chip *chip = dev_get_drvdata(parent); - struct pwm_device *pwm; - unsigned int hwpwm; - int ret; - - ret = kstrtouint(buf, 0, &hwpwm); - if (ret < 0) - return ret; - - if (hwpwm >= chip->npwm) - return -ENODEV; - - pwm = pwm_request_from_chip(chip, hwpwm, "sysfs"); - if (IS_ERR(pwm)) - return PTR_ERR(pwm); - - ret = pwm_export_child(parent, pwm); - if (ret < 0) - pwm_put(pwm); - - return ret ? : len; -} -static DEVICE_ATTR_WO(export); - -static ssize_t unexport_store(struct device *parent, - struct device_attribute *attr, - const char *buf, size_t len) -{ - struct pwm_chip *chip = dev_get_drvdata(parent); - unsigned int hwpwm; - int ret; - - ret = kstrtouint(buf, 0, &hwpwm); - if (ret < 0) - return ret; - - if (hwpwm >= chip->npwm) - return -ENODEV; - - ret = pwm_unexport_child(parent, &chip->pwms[hwpwm]); - - return ret ? : len; -} -static DEVICE_ATTR_WO(unexport); - -static ssize_t npwm_show(struct device *parent, struct device_attribute *attr, - char *buf) -{ - const struct pwm_chip *chip = dev_get_drvdata(parent); - - return sysfs_emit(buf, "%u\n", chip->npwm); -} -static DEVICE_ATTR_RO(npwm); - -static struct attribute *pwm_chip_attrs[] = { - &dev_attr_export.attr, - &dev_attr_unexport.attr, - &dev_attr_npwm.attr, - NULL, -}; -ATTRIBUTE_GROUPS(pwm_chip); - -/* takes export->lock on success */ -static struct pwm_export *pwm_class_get_state(struct device *parent, - struct pwm_device *pwm, - struct pwm_state *state) -{ - struct device *child; - struct pwm_export *export; - - if (!test_bit(PWMF_EXPORTED, &pwm->flags)) - return NULL; - - child = device_find_child(parent, pwm, pwm_unexport_match); - if (!child) - return NULL; - - export = child_to_pwm_export(child); - put_device(child); /* for device_find_child() */ - - mutex_lock(&export->lock); - pwm_get_state(pwm, state); - - return export; -} - -static int pwm_class_apply_state(struct pwm_export *export, - struct pwm_device *pwm, - struct pwm_state *state) -{ - int ret = pwm_apply_might_sleep(pwm, state); - - /* release lock taken in pwm_class_get_state */ - mutex_unlock(&export->lock); - - return ret; -} - -static int pwm_class_resume_npwm(struct device *parent, unsigned int npwm) -{ - struct pwm_chip *chip = dev_get_drvdata(parent); - unsigned int i; - int ret = 0; - - for (i = 0; i < npwm; i++) { - struct pwm_device *pwm = &chip->pwms[i]; - struct pwm_state state; - struct pwm_export *export; - - export = pwm_class_get_state(parent, pwm, &state); - if (!export) - continue; - - /* If pwmchip was not enabled before suspend, do nothing. */ - if (!export->suspend.enabled) { - /* release lock taken in pwm_class_get_state */ - mutex_unlock(&export->lock); - continue; - } - - state.enabled = export->suspend.enabled; - ret = pwm_class_apply_state(export, pwm, &state); - if (ret < 0) - break; - } - - return ret; -} - -static int pwm_class_suspend(struct device *parent) -{ - struct pwm_chip *chip = dev_get_drvdata(parent); - unsigned int i; - int ret = 0; - - for (i = 0; i < chip->npwm; i++) { - struct pwm_device *pwm = &chip->pwms[i]; - struct pwm_state state; - struct pwm_export *export; - - export = pwm_class_get_state(parent, pwm, &state); - if (!export) - continue; - - /* - * If pwmchip was not enabled before suspend, save - * state for resume time and do nothing else. - */ - export->suspend = state; - if (!state.enabled) { - /* release lock taken in pwm_class_get_state */ - mutex_unlock(&export->lock); - continue; - } - - state.enabled = false; - ret = pwm_class_apply_state(export, pwm, &state); - if (ret < 0) { - /* - * roll back the PWM devices that were disabled by - * this suspend function. - */ - pwm_class_resume_npwm(parent, i); - break; - } - } - - return ret; -} - -static int pwm_class_resume(struct device *parent) -{ - struct pwm_chip *chip = dev_get_drvdata(parent); - - return pwm_class_resume_npwm(parent, chip->npwm); -} - -static DEFINE_SIMPLE_DEV_PM_OPS(pwm_class_pm_ops, pwm_class_suspend, pwm_class_resume); - -static struct class pwm_class = { - .name = "pwm", - .dev_groups = pwm_chip_groups, - .pm = pm_sleep_ptr(&pwm_class_pm_ops), -}; - -static int pwmchip_sysfs_match(struct device *parent, const void *data) -{ - return dev_get_drvdata(parent) == data; -} - -void pwmchip_sysfs_export(struct pwm_chip *chip) -{ - struct device *parent; - - /* - * If device_create() fails the pwm_chip is still usable by - * the kernel it's just not exported. - */ - parent = device_create(&pwm_class, pwmchip_parent(chip), MKDEV(0, 0), chip, - "pwmchip%d", chip->id); - if (IS_ERR(parent)) { - dev_warn(pwmchip_parent(chip), - "device_create failed for pwm_chip sysfs export\n"); - } -} - -void pwmchip_sysfs_unexport(struct pwm_chip *chip) -{ - struct device *parent; - unsigned int i; - - parent = class_find_device(&pwm_class, NULL, chip, - pwmchip_sysfs_match); - if (!parent) - return; - - for (i = 0; i < chip->npwm; i++) { - struct pwm_device *pwm = &chip->pwms[i]; - - if (test_bit(PWMF_EXPORTED, &pwm->flags)) - pwm_unexport_child(parent, pwm); - } - - put_device(parent); - device_unregister(parent); -} - -static int __init pwm_sysfs_init(void) -{ - return class_register(&pwm_class); -} -subsys_initcall(pwm_sysfs_init); |