From 597f55e3f36cb512ad82e22f67b9e0962ac1059f Mon Sep 17 00:00:00 2001 From: Fabrice Gasnier Date: Tue, 2 Apr 2019 15:30:44 +0900 Subject: counter: stm32-lptimer: add counter device Add support for new counter device to stm32-lptimer. Signed-off-by: Fabrice Gasnier Reviewed-by: Jonathan Cameron Signed-off-by: William Breathitt Gray Signed-off-by: Greg Kroah-Hartman --- drivers/counter/Kconfig | 10 + drivers/counter/Makefile | 1 + drivers/counter/stm32-lptimer-cnt.c | 754 ++++++++++++++++++++++++++++++++ drivers/iio/Kconfig | 1 - drivers/iio/Makefile | 1 - drivers/iio/counter/Kconfig | 17 - drivers/iio/counter/Makefile | 7 - drivers/iio/counter/stm32-lptimer-cnt.c | 437 ------------------ 8 files changed, 765 insertions(+), 463 deletions(-) create mode 100644 drivers/counter/stm32-lptimer-cnt.c delete mode 100644 drivers/iio/counter/Kconfig delete mode 100644 drivers/iio/counter/Makefile delete mode 100644 drivers/iio/counter/stm32-lptimer-cnt.c (limited to 'drivers') diff --git a/drivers/counter/Kconfig b/drivers/counter/Kconfig index 0bb2340d6087..87c491a19c63 100644 --- a/drivers/counter/Kconfig +++ b/drivers/counter/Kconfig @@ -38,4 +38,14 @@ config STM32_TIMER_CNT To compile this driver as a module, choose M here: the module will be called stm32-timer-cnt. +config STM32_LPTIMER_CNT + tristate "STM32 LP Timer encoder counter driver" + depends on (MFD_STM32_LPTIMER || COMPILE_TEST) && IIO + help + Select this option to enable STM32 Low-Power Timer quadrature encoder + and counter driver. + + To compile this driver as a module, choose M here: the + module will be called stm32-lptimer-cnt. + endif # COUNTER diff --git a/drivers/counter/Makefile b/drivers/counter/Makefile index 6b4a5be21b00..5589976d37f8 100644 --- a/drivers/counter/Makefile +++ b/drivers/counter/Makefile @@ -6,3 +6,4 @@ obj-$(CONFIG_COUNTER) += counter.o obj-$(CONFIG_104_QUAD_8) += 104-quad-8.o obj-$(CONFIG_STM32_TIMER_CNT) += stm32-timer-cnt.o +obj-$(CONFIG_STM32_LPTIMER_CNT) += stm32-lptimer-cnt.o diff --git a/drivers/counter/stm32-lptimer-cnt.c b/drivers/counter/stm32-lptimer-cnt.c new file mode 100644 index 000000000000..bbc930a5962c --- /dev/null +++ b/drivers/counter/stm32-lptimer-cnt.c @@ -0,0 +1,754 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * STM32 Low-Power Timer Encoder and Counter driver + * + * Copyright (C) STMicroelectronics 2017 + * + * Author: Fabrice Gasnier + * + * Inspired by 104-quad-8 and stm32-timer-trigger drivers. + * + */ + +#include +#include +#include +#include +#include +#include +#include + +struct stm32_lptim_cnt { + struct counter_device counter; + struct device *dev; + struct regmap *regmap; + struct clk *clk; + u32 ceiling; + u32 polarity; + u32 quadrature_mode; + bool enabled; +}; + +static int stm32_lptim_is_enabled(struct stm32_lptim_cnt *priv) +{ + u32 val; + int ret; + + ret = regmap_read(priv->regmap, STM32_LPTIM_CR, &val); + if (ret) + return ret; + + return FIELD_GET(STM32_LPTIM_ENABLE, val); +} + +static int stm32_lptim_set_enable_state(struct stm32_lptim_cnt *priv, + int enable) +{ + int ret; + u32 val; + + val = FIELD_PREP(STM32_LPTIM_ENABLE, enable); + ret = regmap_write(priv->regmap, STM32_LPTIM_CR, val); + if (ret) + return ret; + + if (!enable) { + clk_disable(priv->clk); + priv->enabled = false; + return 0; + } + + /* LP timer must be enabled before writing CMP & ARR */ + ret = regmap_write(priv->regmap, STM32_LPTIM_ARR, priv->ceiling); + if (ret) + return ret; + + ret = regmap_write(priv->regmap, STM32_LPTIM_CMP, 0); + if (ret) + return ret; + + /* ensure CMP & ARR registers are properly written */ + ret = regmap_read_poll_timeout(priv->regmap, STM32_LPTIM_ISR, val, + (val & STM32_LPTIM_CMPOK_ARROK), + 100, 1000); + if (ret) + return ret; + + ret = regmap_write(priv->regmap, STM32_LPTIM_ICR, + STM32_LPTIM_CMPOKCF_ARROKCF); + if (ret) + return ret; + + ret = clk_enable(priv->clk); + if (ret) { + regmap_write(priv->regmap, STM32_LPTIM_CR, 0); + return ret; + } + priv->enabled = true; + + /* Start LP timer in continuous mode */ + return regmap_update_bits(priv->regmap, STM32_LPTIM_CR, + STM32_LPTIM_CNTSTRT, STM32_LPTIM_CNTSTRT); +} + +static int stm32_lptim_setup(struct stm32_lptim_cnt *priv, int enable) +{ + u32 mask = STM32_LPTIM_ENC | STM32_LPTIM_COUNTMODE | + STM32_LPTIM_CKPOL | STM32_LPTIM_PRESC; + u32 val; + + /* Setup LP timer encoder/counter and polarity, without prescaler */ + if (priv->quadrature_mode) + val = enable ? STM32_LPTIM_ENC : 0; + else + val = enable ? STM32_LPTIM_COUNTMODE : 0; + val |= FIELD_PREP(STM32_LPTIM_CKPOL, enable ? priv->polarity : 0); + + return regmap_update_bits(priv->regmap, STM32_LPTIM_CFGR, mask, val); +} + +static int stm32_lptim_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct stm32_lptim_cnt *priv = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_ENABLE: + if (val < 0 || val > 1) + return -EINVAL; + + /* Check nobody uses the timer, or already disabled/enabled */ + ret = stm32_lptim_is_enabled(priv); + if ((ret < 0) || (!ret && !val)) + return ret; + if (val && ret) + return -EBUSY; + + ret = stm32_lptim_setup(priv, val); + if (ret) + return ret; + return stm32_lptim_set_enable_state(priv, val); + + default: + return -EINVAL; + } +} + +static int stm32_lptim_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct stm32_lptim_cnt *priv = iio_priv(indio_dev); + u32 dat; + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = regmap_read(priv->regmap, STM32_LPTIM_CNT, &dat); + if (ret) + return ret; + *val = dat; + return IIO_VAL_INT; + + case IIO_CHAN_INFO_ENABLE: + ret = stm32_lptim_is_enabled(priv); + if (ret < 0) + return ret; + *val = ret; + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + /* Non-quadrature mode: scale = 1 */ + *val = 1; + *val2 = 0; + if (priv->quadrature_mode) { + /* + * Quadrature encoder mode: + * - both edges, quarter cycle, scale is 0.25 + * - either rising/falling edge scale is 0.5 + */ + if (priv->polarity > 1) + *val2 = 2; + else + *val2 = 1; + } + return IIO_VAL_FRACTIONAL_LOG2; + + default: + return -EINVAL; + } +} + +static const struct iio_info stm32_lptim_cnt_iio_info = { + .read_raw = stm32_lptim_read_raw, + .write_raw = stm32_lptim_write_raw, +}; + +static const char *const stm32_lptim_quadrature_modes[] = { + "non-quadrature", + "quadrature", +}; + +static int stm32_lptim_get_quadrature_mode(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan) +{ + struct stm32_lptim_cnt *priv = iio_priv(indio_dev); + + return priv->quadrature_mode; +} + +static int stm32_lptim_set_quadrature_mode(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + unsigned int type) +{ + struct stm32_lptim_cnt *priv = iio_priv(indio_dev); + + if (stm32_lptim_is_enabled(priv)) + return -EBUSY; + + priv->quadrature_mode = type; + + return 0; +} + +static const struct iio_enum stm32_lptim_quadrature_mode_en = { + .items = stm32_lptim_quadrature_modes, + .num_items = ARRAY_SIZE(stm32_lptim_quadrature_modes), + .get = stm32_lptim_get_quadrature_mode, + .set = stm32_lptim_set_quadrature_mode, +}; + +static const char * const stm32_lptim_cnt_polarity[] = { + "rising-edge", "falling-edge", "both-edges", +}; + +static int stm32_lptim_cnt_get_polarity(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan) +{ + struct stm32_lptim_cnt *priv = iio_priv(indio_dev); + + return priv->polarity; +} + +static int stm32_lptim_cnt_set_polarity(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + unsigned int type) +{ + struct stm32_lptim_cnt *priv = iio_priv(indio_dev); + + if (stm32_lptim_is_enabled(priv)) + return -EBUSY; + + priv->polarity = type; + + return 0; +} + +static const struct iio_enum stm32_lptim_cnt_polarity_en = { + .items = stm32_lptim_cnt_polarity, + .num_items = ARRAY_SIZE(stm32_lptim_cnt_polarity), + .get = stm32_lptim_cnt_get_polarity, + .set = stm32_lptim_cnt_set_polarity, +}; + +static ssize_t stm32_lptim_cnt_get_ceiling(struct stm32_lptim_cnt *priv, + char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%u\n", priv->ceiling); +} + +static ssize_t stm32_lptim_cnt_set_ceiling(struct stm32_lptim_cnt *priv, + const char *buf, size_t len) +{ + int ret; + + if (stm32_lptim_is_enabled(priv)) + return -EBUSY; + + ret = kstrtouint(buf, 0, &priv->ceiling); + if (ret) + return ret; + + if (priv->ceiling > STM32_LPTIM_MAX_ARR) + return -EINVAL; + + return len; +} + +static ssize_t stm32_lptim_cnt_get_preset_iio(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + char *buf) +{ + struct stm32_lptim_cnt *priv = iio_priv(indio_dev); + + return stm32_lptim_cnt_get_ceiling(priv, buf); +} + +static ssize_t stm32_lptim_cnt_set_preset_iio(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + const char *buf, size_t len) +{ + struct stm32_lptim_cnt *priv = iio_priv(indio_dev); + + return stm32_lptim_cnt_set_ceiling(priv, buf, len); +} + +/* LP timer with encoder */ +static const struct iio_chan_spec_ext_info stm32_lptim_enc_ext_info[] = { + { + .name = "preset", + .shared = IIO_SEPARATE, + .read = stm32_lptim_cnt_get_preset_iio, + .write = stm32_lptim_cnt_set_preset_iio, + }, + IIO_ENUM("polarity", IIO_SEPARATE, &stm32_lptim_cnt_polarity_en), + IIO_ENUM_AVAILABLE("polarity", &stm32_lptim_cnt_polarity_en), + IIO_ENUM("quadrature_mode", IIO_SEPARATE, + &stm32_lptim_quadrature_mode_en), + IIO_ENUM_AVAILABLE("quadrature_mode", &stm32_lptim_quadrature_mode_en), + {} +}; + +static const struct iio_chan_spec stm32_lptim_enc_channels = { + .type = IIO_COUNT, + .channel = 0, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_ENABLE) | + BIT(IIO_CHAN_INFO_SCALE), + .ext_info = stm32_lptim_enc_ext_info, + .indexed = 1, +}; + +/* LP timer without encoder (counter only) */ +static const struct iio_chan_spec_ext_info stm32_lptim_cnt_ext_info[] = { + { + .name = "preset", + .shared = IIO_SEPARATE, + .read = stm32_lptim_cnt_get_preset_iio, + .write = stm32_lptim_cnt_set_preset_iio, + }, + IIO_ENUM("polarity", IIO_SEPARATE, &stm32_lptim_cnt_polarity_en), + IIO_ENUM_AVAILABLE("polarity", &stm32_lptim_cnt_polarity_en), + {} +}; + +static const struct iio_chan_spec stm32_lptim_cnt_channels = { + .type = IIO_COUNT, + .channel = 0, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_ENABLE) | + BIT(IIO_CHAN_INFO_SCALE), + .ext_info = stm32_lptim_cnt_ext_info, + .indexed = 1, +}; + +/** + * stm32_lptim_cnt_function - enumerates stm32 LPTimer counter & encoder modes + * @STM32_LPTIM_COUNTER_INCREASE: up count on IN1 rising, falling or both edges + * @STM32_LPTIM_ENCODER_BOTH_EDGE: count on both edges (IN1 & IN2 quadrature) + */ +enum stm32_lptim_cnt_function { + STM32_LPTIM_COUNTER_INCREASE, + STM32_LPTIM_ENCODER_BOTH_EDGE, +}; + +static enum counter_count_function stm32_lptim_cnt_functions[] = { + [STM32_LPTIM_COUNTER_INCREASE] = COUNTER_COUNT_FUNCTION_INCREASE, + [STM32_LPTIM_ENCODER_BOTH_EDGE] = COUNTER_COUNT_FUNCTION_QUADRATURE_X4, +}; + +enum stm32_lptim_synapse_action { + STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE, + STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE, + STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES, + STM32_LPTIM_SYNAPSE_ACTION_NONE, +}; + +static enum counter_synapse_action stm32_lptim_cnt_synapse_actions[] = { + /* Index must match with stm32_lptim_cnt_polarity[] (priv->polarity) */ + [STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE, + [STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE] = COUNTER_SYNAPSE_ACTION_FALLING_EDGE, + [STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES, + [STM32_LPTIM_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE, +}; + +static int stm32_lptim_cnt_read(struct counter_device *counter, + struct counter_count *count, + struct counter_count_read_value *val) +{ + struct stm32_lptim_cnt *const priv = counter->priv; + u32 cnt; + int ret; + + ret = regmap_read(priv->regmap, STM32_LPTIM_CNT, &cnt); + if (ret) + return ret; + + counter_count_read_value_set(val, COUNTER_COUNT_POSITION, &cnt); + + return 0; +} + +static int stm32_lptim_cnt_function_get(struct counter_device *counter, + struct counter_count *count, + size_t *function) +{ + struct stm32_lptim_cnt *const priv = counter->priv; + + if (!priv->quadrature_mode) { + *function = STM32_LPTIM_COUNTER_INCREASE; + return 0; + } + + if (priv->polarity == STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES) { + *function = STM32_LPTIM_ENCODER_BOTH_EDGE; + return 0; + } + + return -EINVAL; +} + +static int stm32_lptim_cnt_function_set(struct counter_device *counter, + struct counter_count *count, + size_t function) +{ + struct stm32_lptim_cnt *const priv = counter->priv; + + if (stm32_lptim_is_enabled(priv)) + return -EBUSY; + + switch (function) { + case STM32_LPTIM_COUNTER_INCREASE: + priv->quadrature_mode = 0; + return 0; + case STM32_LPTIM_ENCODER_BOTH_EDGE: + priv->quadrature_mode = 1; + priv->polarity = STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES; + return 0; + } + + return -EINVAL; +} + +static ssize_t stm32_lptim_cnt_enable_read(struct counter_device *counter, + struct counter_count *count, + void *private, char *buf) +{ + struct stm32_lptim_cnt *const priv = counter->priv; + int ret; + + ret = stm32_lptim_is_enabled(priv); + if (ret < 0) + return ret; + + return scnprintf(buf, PAGE_SIZE, "%u\n", ret); +} + +static ssize_t stm32_lptim_cnt_enable_write(struct counter_device *counter, + struct counter_count *count, + void *private, + const char *buf, size_t len) +{ + struct stm32_lptim_cnt *const priv = counter->priv; + bool enable; + int ret; + + ret = kstrtobool(buf, &enable); + if (ret) + return ret; + + /* Check nobody uses the timer, or already disabled/enabled */ + ret = stm32_lptim_is_enabled(priv); + if ((ret < 0) || (!ret && !enable)) + return ret; + if (enable && ret) + return -EBUSY; + + ret = stm32_lptim_setup(priv, enable); + if (ret) + return ret; + + ret = stm32_lptim_set_enable_state(priv, enable); + if (ret) + return ret; + + return len; +} + +static ssize_t stm32_lptim_cnt_ceiling_read(struct counter_device *counter, + struct counter_count *count, + void *private, char *buf) +{ + struct stm32_lptim_cnt *const priv = counter->priv; + + return stm32_lptim_cnt_get_ceiling(priv, buf); +} + +static ssize_t stm32_lptim_cnt_ceiling_write(struct counter_device *counter, + struct counter_count *count, + void *private, + const char *buf, size_t len) +{ + struct stm32_lptim_cnt *const priv = counter->priv; + + return stm32_lptim_cnt_set_ceiling(priv, buf, len); +} + +static const struct counter_count_ext stm32_lptim_cnt_ext[] = { + { + .name = "enable", + .read = stm32_lptim_cnt_enable_read, + .write = stm32_lptim_cnt_enable_write + }, + { + .name = "ceiling", + .read = stm32_lptim_cnt_ceiling_read, + .write = stm32_lptim_cnt_ceiling_write + }, +}; + +static int stm32_lptim_cnt_action_get(struct counter_device *counter, + struct counter_count *count, + struct counter_synapse *synapse, + size_t *action) +{ + struct stm32_lptim_cnt *const priv = counter->priv; + size_t function; + int err; + + err = stm32_lptim_cnt_function_get(counter, count, &function); + if (err) + return err; + + switch (function) { + case STM32_LPTIM_COUNTER_INCREASE: + /* LP Timer acts as up-counter on input 1 */ + if (synapse->signal->id == count->synapses[0].signal->id) + *action = priv->polarity; + else + *action = STM32_LPTIM_SYNAPSE_ACTION_NONE; + return 0; + case STM32_LPTIM_ENCODER_BOTH_EDGE: + *action = priv->polarity; + return 0; + } + + return -EINVAL; +} + +static int stm32_lptim_cnt_action_set(struct counter_device *counter, + struct counter_count *count, + struct counter_synapse *synapse, + size_t action) +{ + struct stm32_lptim_cnt *const priv = counter->priv; + size_t function; + int err; + + if (stm32_lptim_is_enabled(priv)) + return -EBUSY; + + err = stm32_lptim_cnt_function_get(counter, count, &function); + if (err) + return err; + + /* only set polarity when in counter mode (on input 1) */ + if (function == STM32_LPTIM_COUNTER_INCREASE + && synapse->signal->id == count->synapses[0].signal->id) { + switch (action) { + case STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE: + case STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE: + case STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES: + priv->polarity = action; + return 0; + } + } + + return -EINVAL; +} + +static const struct counter_ops stm32_lptim_cnt_ops = { + .count_read = stm32_lptim_cnt_read, + .function_get = stm32_lptim_cnt_function_get, + .function_set = stm32_lptim_cnt_function_set, + .action_get = stm32_lptim_cnt_action_get, + .action_set = stm32_lptim_cnt_action_set, +}; + +static struct counter_signal stm32_lptim_cnt_signals[] = { + { + .id = 0, + .name = "Channel 1 Quadrature A" + }, + { + .id = 1, + .name = "Channel 1 Quadrature B" + } +}; + +static struct counter_synapse stm32_lptim_cnt_synapses[] = { + { + .actions_list = stm32_lptim_cnt_synapse_actions, + .num_actions = ARRAY_SIZE(stm32_lptim_cnt_synapse_actions), + .signal = &stm32_lptim_cnt_signals[0] + }, + { + .actions_list = stm32_lptim_cnt_synapse_actions, + .num_actions = ARRAY_SIZE(stm32_lptim_cnt_synapse_actions), + .signal = &stm32_lptim_cnt_signals[1] + } +}; + +/* LP timer with encoder */ +static struct counter_count stm32_lptim_enc_counts = { + .id = 0, + .name = "LPTimer Count", + .functions_list = stm32_lptim_cnt_functions, + .num_functions = ARRAY_SIZE(stm32_lptim_cnt_functions), + .synapses = stm32_lptim_cnt_synapses, + .num_synapses = ARRAY_SIZE(stm32_lptim_cnt_synapses), + .ext = stm32_lptim_cnt_ext, + .num_ext = ARRAY_SIZE(stm32_lptim_cnt_ext) +}; + +/* LP timer without encoder (counter only) */ +static struct counter_count stm32_lptim_in1_counts = { + .id = 0, + .name = "LPTimer Count", + .functions_list = stm32_lptim_cnt_functions, + .num_functions = 1, + .synapses = stm32_lptim_cnt_synapses, + .num_synapses = 1, + .ext = stm32_lptim_cnt_ext, + .num_ext = ARRAY_SIZE(stm32_lptim_cnt_ext) +}; + +static int stm32_lptim_cnt_probe(struct platform_device *pdev) +{ + struct stm32_lptimer *ddata = dev_get_drvdata(pdev->dev.parent); + struct stm32_lptim_cnt *priv; + struct iio_dev *indio_dev; + int ret; + + if (IS_ERR_OR_NULL(ddata)) + return -EINVAL; + + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv)); + if (!indio_dev) + return -ENOMEM; + + priv = iio_priv(indio_dev); + priv->dev = &pdev->dev; + priv->regmap = ddata->regmap; + priv->clk = ddata->clk; + priv->ceiling = STM32_LPTIM_MAX_ARR; + + /* Initialize IIO device */ + indio_dev->name = dev_name(&pdev->dev); + indio_dev->dev.parent = &pdev->dev; + indio_dev->dev.of_node = pdev->dev.of_node; + indio_dev->info = &stm32_lptim_cnt_iio_info; + if (ddata->has_encoder) + indio_dev->channels = &stm32_lptim_enc_channels; + else + indio_dev->channels = &stm32_lptim_cnt_channels; + indio_dev->num_channels = 1; + + /* Initialize Counter device */ + priv->counter.name = dev_name(&pdev->dev); + priv->counter.parent = &pdev->dev; + priv->counter.ops = &stm32_lptim_cnt_ops; + if (ddata->has_encoder) { + priv->counter.counts = &stm32_lptim_enc_counts; + priv->counter.num_signals = ARRAY_SIZE(stm32_lptim_cnt_signals); + } else { + priv->counter.counts = &stm32_lptim_in1_counts; + priv->counter.num_signals = 1; + } + priv->counter.num_counts = 1; + priv->counter.signals = stm32_lptim_cnt_signals; + priv->counter.priv = priv; + + platform_set_drvdata(pdev, priv); + + ret = devm_iio_device_register(&pdev->dev, indio_dev); + if (ret) + return ret; + + return devm_counter_register(&pdev->dev, &priv->counter); +} + +#ifdef CONFIG_PM_SLEEP +static int stm32_lptim_cnt_suspend(struct device *dev) +{ + struct stm32_lptim_cnt *priv = dev_get_drvdata(dev); + int ret; + + /* Only take care of enabled counter: don't disturb other MFD child */ + if (priv->enabled) { + ret = stm32_lptim_setup(priv, 0); + if (ret) + return ret; + + ret = stm32_lptim_set_enable_state(priv, 0); + if (ret) + return ret; + + /* Force enable state for later resume */ + priv->enabled = true; + } + + return pinctrl_pm_select_sleep_state(dev); +} + +static int stm32_lptim_cnt_resume(struct device *dev) +{ + struct stm32_lptim_cnt *priv = dev_get_drvdata(dev); + int ret; + + ret = pinctrl_pm_select_default_state(dev); + if (ret) + return ret; + + if (priv->enabled) { + priv->enabled = false; + ret = stm32_lptim_setup(priv, 1); + if (ret) + return ret; + + ret = stm32_lptim_set_enable_state(priv, 1); + if (ret) + return ret; + } + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(stm32_lptim_cnt_pm_ops, stm32_lptim_cnt_suspend, + stm32_lptim_cnt_resume); + +static const struct of_device_id stm32_lptim_cnt_of_match[] = { + { .compatible = "st,stm32-lptimer-counter", }, + {}, +}; +MODULE_DEVICE_TABLE(of, stm32_lptim_cnt_of_match); + +static struct platform_driver stm32_lptim_cnt_driver = { + .probe = stm32_lptim_cnt_probe, + .driver = { + .name = "stm32-lptimer-counter", + .of_match_table = stm32_lptim_cnt_of_match, + .pm = &stm32_lptim_cnt_pm_ops, + }, +}; +module_platform_driver(stm32_lptim_cnt_driver); + +MODULE_AUTHOR("Fabrice Gasnier "); +MODULE_ALIAS("platform:stm32-lptimer-counter"); +MODULE_DESCRIPTION("STMicroelectronics STM32 LPTIM counter driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig index 014006d1cbb6..4243e35c25e9 100644 --- a/drivers/iio/Kconfig +++ b/drivers/iio/Kconfig @@ -74,7 +74,6 @@ source "drivers/iio/afe/Kconfig" source "drivers/iio/amplifiers/Kconfig" source "drivers/iio/chemical/Kconfig" source "drivers/iio/common/Kconfig" -source "drivers/iio/counter/Kconfig" source "drivers/iio/dac/Kconfig" source "drivers/iio/dummy/Kconfig" source "drivers/iio/frequency/Kconfig" diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile index cb5993251381..bff682ad1cfb 100644 --- a/drivers/iio/Makefile +++ b/drivers/iio/Makefile @@ -20,7 +20,6 @@ obj-y += amplifiers/ obj-y += buffer/ obj-y += chemical/ obj-y += common/ -obj-y += counter/ obj-y += dac/ obj-y += dummy/ obj-y += gyro/ diff --git a/drivers/iio/counter/Kconfig b/drivers/iio/counter/Kconfig deleted file mode 100644 index eeb358122cbe..000000000000 --- a/drivers/iio/counter/Kconfig +++ /dev/null @@ -1,17 +0,0 @@ -# -# Counter devices -# -# When adding new entries keep the list in alphabetical order - -menu "Counters" - -config STM32_LPTIMER_CNT - tristate "STM32 LP Timer encoder counter driver" - depends on MFD_STM32_LPTIMER || COMPILE_TEST - help - Select this option to enable STM32 Low-Power Timer quadrature encoder - and counter driver. - - To compile this driver as a module, choose M here: the - module will be called stm32-lptimer-cnt. -endmenu diff --git a/drivers/iio/counter/Makefile b/drivers/iio/counter/Makefile deleted file mode 100644 index 93933ba49280..000000000000 --- a/drivers/iio/counter/Makefile +++ /dev/null @@ -1,7 +0,0 @@ -# -# Makefile for IIO counter devices -# - -# When adding new entries keep the list in alphabetical order - -obj-$(CONFIG_STM32_LPTIMER_CNT) += stm32-lptimer-cnt.o diff --git a/drivers/iio/counter/stm32-lptimer-cnt.c b/drivers/iio/counter/stm32-lptimer-cnt.c deleted file mode 100644 index 2a49cce0edb4..000000000000 --- a/drivers/iio/counter/stm32-lptimer-cnt.c +++ /dev/null @@ -1,437 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * STM32 Low-Power Timer Encoder and Counter driver - * - * Copyright (C) STMicroelectronics 2017 - * - * Author: Fabrice Gasnier - * - * Inspired by 104-quad-8 and stm32-timer-trigger drivers. - * - */ - -#include -#include -#include -#include -#include -#include - -struct stm32_lptim_cnt { - struct device *dev; - struct regmap *regmap; - struct clk *clk; - u32 preset; - u32 polarity; - u32 quadrature_mode; - bool enabled; -}; - -static int stm32_lptim_is_enabled(struct stm32_lptim_cnt *priv) -{ - u32 val; - int ret; - - ret = regmap_read(priv->regmap, STM32_LPTIM_CR, &val); - if (ret) - return ret; - - return FIELD_GET(STM32_LPTIM_ENABLE, val); -} - -static int stm32_lptim_set_enable_state(struct stm32_lptim_cnt *priv, - int enable) -{ - int ret; - u32 val; - - val = FIELD_PREP(STM32_LPTIM_ENABLE, enable); - ret = regmap_write(priv->regmap, STM32_LPTIM_CR, val); - if (ret) - return ret; - - if (!enable) { - clk_disable(priv->clk); - priv->enabled = false; - return 0; - } - - /* LP timer must be enabled before writing CMP & ARR */ - ret = regmap_write(priv->regmap, STM32_LPTIM_ARR, priv->preset); - if (ret) - return ret; - - ret = regmap_write(priv->regmap, STM32_LPTIM_CMP, 0); - if (ret) - return ret; - - /* ensure CMP & ARR registers are properly written */ - ret = regmap_read_poll_timeout(priv->regmap, STM32_LPTIM_ISR, val, - (val & STM32_LPTIM_CMPOK_ARROK), - 100, 1000); - if (ret) - return ret; - - ret = regmap_write(priv->regmap, STM32_LPTIM_ICR, - STM32_LPTIM_CMPOKCF_ARROKCF); - if (ret) - return ret; - - ret = clk_enable(priv->clk); - if (ret) { - regmap_write(priv->regmap, STM32_LPTIM_CR, 0); - return ret; - } - priv->enabled = true; - - /* Start LP timer in continuous mode */ - return regmap_update_bits(priv->regmap, STM32_LPTIM_CR, - STM32_LPTIM_CNTSTRT, STM32_LPTIM_CNTSTRT); -} - -static int stm32_lptim_setup(struct stm32_lptim_cnt *priv, int enable) -{ - u32 mask = STM32_LPTIM_ENC | STM32_LPTIM_COUNTMODE | - STM32_LPTIM_CKPOL | STM32_LPTIM_PRESC; - u32 val; - - /* Setup LP timer encoder/counter and polarity, without prescaler */ - if (priv->quadrature_mode) - val = enable ? STM32_LPTIM_ENC : 0; - else - val = enable ? STM32_LPTIM_COUNTMODE : 0; - val |= FIELD_PREP(STM32_LPTIM_CKPOL, enable ? priv->polarity : 0); - - return regmap_update_bits(priv->regmap, STM32_LPTIM_CFGR, mask, val); -} - -static int stm32_lptim_write_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int val, int val2, long mask) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - int ret; - - switch (mask) { - case IIO_CHAN_INFO_ENABLE: - if (val < 0 || val > 1) - return -EINVAL; - - /* Check nobody uses the timer, or already disabled/enabled */ - ret = stm32_lptim_is_enabled(priv); - if ((ret < 0) || (!ret && !val)) - return ret; - if (val && ret) - return -EBUSY; - - ret = stm32_lptim_setup(priv, val); - if (ret) - return ret; - return stm32_lptim_set_enable_state(priv, val); - - default: - return -EINVAL; - } -} - -static int stm32_lptim_read_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int *val, int *val2, long mask) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - u32 dat; - int ret; - - switch (mask) { - case IIO_CHAN_INFO_RAW: - ret = regmap_read(priv->regmap, STM32_LPTIM_CNT, &dat); - if (ret) - return ret; - *val = dat; - return IIO_VAL_INT; - - case IIO_CHAN_INFO_ENABLE: - ret = stm32_lptim_is_enabled(priv); - if (ret < 0) - return ret; - *val = ret; - return IIO_VAL_INT; - - case IIO_CHAN_INFO_SCALE: - /* Non-quadrature mode: scale = 1 */ - *val = 1; - *val2 = 0; - if (priv->quadrature_mode) { - /* - * Quadrature encoder mode: - * - both edges, quarter cycle, scale is 0.25 - * - either rising/falling edge scale is 0.5 - */ - if (priv->polarity > 1) - *val2 = 2; - else - *val2 = 1; - } - return IIO_VAL_FRACTIONAL_LOG2; - - default: - return -EINVAL; - } -} - -static const struct iio_info stm32_lptim_cnt_iio_info = { - .read_raw = stm32_lptim_read_raw, - .write_raw = stm32_lptim_write_raw, -}; - -static const char *const stm32_lptim_quadrature_modes[] = { - "non-quadrature", - "quadrature", -}; - -static int stm32_lptim_get_quadrature_mode(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - - return priv->quadrature_mode; -} - -static int stm32_lptim_set_quadrature_mode(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan, - unsigned int type) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - - if (stm32_lptim_is_enabled(priv)) - return -EBUSY; - - priv->quadrature_mode = type; - - return 0; -} - -static const struct iio_enum stm32_lptim_quadrature_mode_en = { - .items = stm32_lptim_quadrature_modes, - .num_items = ARRAY_SIZE(stm32_lptim_quadrature_modes), - .get = stm32_lptim_get_quadrature_mode, - .set = stm32_lptim_set_quadrature_mode, -}; - -static const char * const stm32_lptim_cnt_polarity[] = { - "rising-edge", "falling-edge", "both-edges", -}; - -static int stm32_lptim_cnt_get_polarity(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - - return priv->polarity; -} - -static int stm32_lptim_cnt_set_polarity(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan, - unsigned int type) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - - if (stm32_lptim_is_enabled(priv)) - return -EBUSY; - - priv->polarity = type; - - return 0; -} - -static const struct iio_enum stm32_lptim_cnt_polarity_en = { - .items = stm32_lptim_cnt_polarity, - .num_items = ARRAY_SIZE(stm32_lptim_cnt_polarity), - .get = stm32_lptim_cnt_get_polarity, - .set = stm32_lptim_cnt_set_polarity, -}; - -static ssize_t stm32_lptim_cnt_get_preset(struct iio_dev *indio_dev, - uintptr_t private, - const struct iio_chan_spec *chan, - char *buf) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - - return snprintf(buf, PAGE_SIZE, "%u\n", priv->preset); -} - -static ssize_t stm32_lptim_cnt_set_preset(struct iio_dev *indio_dev, - uintptr_t private, - const struct iio_chan_spec *chan, - const char *buf, size_t len) -{ - struct stm32_lptim_cnt *priv = iio_priv(indio_dev); - int ret; - - if (stm32_lptim_is_enabled(priv)) - return -EBUSY; - - ret = kstrtouint(buf, 0, &priv->preset); - if (ret) - return ret; - - if (priv->preset > STM32_LPTIM_MAX_ARR) - return -EINVAL; - - return len; -} - -/* LP timer with encoder */ -static const struct iio_chan_spec_ext_info stm32_lptim_enc_ext_info[] = { - { - .name = "preset", - .shared = IIO_SEPARATE, - .read = stm32_lptim_cnt_get_preset, - .write = stm32_lptim_cnt_set_preset, - }, - IIO_ENUM("polarity", IIO_SEPARATE, &stm32_lptim_cnt_polarity_en), - IIO_ENUM_AVAILABLE("polarity", &stm32_lptim_cnt_polarity_en), - IIO_ENUM("quadrature_mode", IIO_SEPARATE, - &stm32_lptim_quadrature_mode_en), - IIO_ENUM_AVAILABLE("quadrature_mode", &stm32_lptim_quadrature_mode_en), - {} -}; - -static const struct iio_chan_spec stm32_lptim_enc_channels = { - .type = IIO_COUNT, - .channel = 0, - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | - BIT(IIO_CHAN_INFO_ENABLE) | - BIT(IIO_CHAN_INFO_SCALE), - .ext_info = stm32_lptim_enc_ext_info, - .indexed = 1, -}; - -/* LP timer without encoder (counter only) */ -static const struct iio_chan_spec_ext_info stm32_lptim_cnt_ext_info[] = { - { - .name = "preset", - .shared = IIO_SEPARATE, - .read = stm32_lptim_cnt_get_preset, - .write = stm32_lptim_cnt_set_preset, - }, - IIO_ENUM("polarity", IIO_SEPARATE, &stm32_lptim_cnt_polarity_en), - IIO_ENUM_AVAILABLE("polarity", &stm32_lptim_cnt_polarity_en), - {} -}; - -static const struct iio_chan_spec stm32_lptim_cnt_channels = { - .type = IIO_COUNT, - .channel = 0, - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | - BIT(IIO_CHAN_INFO_ENABLE) | - BIT(IIO_CHAN_INFO_SCALE), - .ext_info = stm32_lptim_cnt_ext_info, - .indexed = 1, -}; - -static int stm32_lptim_cnt_probe(struct platform_device *pdev) -{ - struct stm32_lptimer *ddata = dev_get_drvdata(pdev->dev.parent); - struct stm32_lptim_cnt *priv; - struct iio_dev *indio_dev; - - if (IS_ERR_OR_NULL(ddata)) - return -EINVAL; - - indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv)); - if (!indio_dev) - return -ENOMEM; - - priv = iio_priv(indio_dev); - priv->dev = &pdev->dev; - priv->regmap = ddata->regmap; - priv->clk = ddata->clk; - priv->preset = STM32_LPTIM_MAX_ARR; - - indio_dev->name = dev_name(&pdev->dev); - indio_dev->dev.parent = &pdev->dev; - indio_dev->dev.of_node = pdev->dev.of_node; - indio_dev->info = &stm32_lptim_cnt_iio_info; - if (ddata->has_encoder) - indio_dev->channels = &stm32_lptim_enc_channels; - else - indio_dev->channels = &stm32_lptim_cnt_channels; - indio_dev->num_channels = 1; - - platform_set_drvdata(pdev, priv); - - return devm_iio_device_register(&pdev->dev, indio_dev); -} - -#ifdef CONFIG_PM_SLEEP -static int stm32_lptim_cnt_suspend(struct device *dev) -{ - struct stm32_lptim_cnt *priv = dev_get_drvdata(dev); - int ret; - - /* Only take care of enabled counter: don't disturb other MFD child */ - if (priv->enabled) { - ret = stm32_lptim_setup(priv, 0); - if (ret) - return ret; - - ret = stm32_lptim_set_enable_state(priv, 0); - if (ret) - return ret; - - /* Force enable state for later resume */ - priv->enabled = true; - } - - return pinctrl_pm_select_sleep_state(dev); -} - -static int stm32_lptim_cnt_resume(struct device *dev) -{ - struct stm32_lptim_cnt *priv = dev_get_drvdata(dev); - int ret; - - ret = pinctrl_pm_select_default_state(dev); - if (ret) - return ret; - - if (priv->enabled) { - priv->enabled = false; - ret = stm32_lptim_setup(priv, 1); - if (ret) - return ret; - - ret = stm32_lptim_set_enable_state(priv, 1); - if (ret) - return ret; - } - - return 0; -} -#endif - -static SIMPLE_DEV_PM_OPS(stm32_lptim_cnt_pm_ops, stm32_lptim_cnt_suspend, - stm32_lptim_cnt_resume); - -static const struct of_device_id stm32_lptim_cnt_of_match[] = { - { .compatible = "st,stm32-lptimer-counter", }, - {}, -}; -MODULE_DEVICE_TABLE(of, stm32_lptim_cnt_of_match); - -static struct platform_driver stm32_lptim_cnt_driver = { - .probe = stm32_lptim_cnt_probe, - .driver = { - .name = "stm32-lptimer-counter", - .of_match_table = stm32_lptim_cnt_of_match, - .pm = &stm32_lptim_cnt_pm_ops, - }, -}; -module_platform_driver(stm32_lptim_cnt_driver); - -MODULE_AUTHOR("Fabrice Gasnier "); -MODULE_ALIAS("platform:stm32-lptimer-counter"); -MODULE_DESCRIPTION("STMicroelectronics STM32 LPTIM counter driver"); -MODULE_LICENSE("GPL v2"); -- cgit v1.2.3-59-g8ed1b