diff options
Diffstat (limited to 'drivers/iio/dac/ad3552r-hs.c')
| -rw-r--r-- | drivers/iio/dac/ad3552r-hs.c | 182 |
1 files changed, 176 insertions, 6 deletions
diff --git a/drivers/iio/dac/ad3552r-hs.c b/drivers/iio/dac/ad3552r-hs.c index cd8dabb60c55..41b96b48ba98 100644 --- a/drivers/iio/dac/ad3552r-hs.c +++ b/drivers/iio/dac/ad3552r-hs.c @@ -7,6 +7,7 @@ */ #include <linux/bitfield.h> +#include <linux/debugfs.h> #include <linux/delay.h> #include <linux/gpio/consumer.h> #include <linux/iio/backend.h> @@ -54,6 +55,18 @@ struct ad3552r_hs_state { struct ad3552r_hs_platform_data *data; /* INTERFACE_CONFIG_D register cache, in DDR we cannot read values. */ u32 config_d; + /* Protects backend I/O operations from concurrent accesses. */ + struct mutex lock; +}; + +enum ad3552r_sources { + AD3552R_SRC_NORMAL, + AD3552R_SRC_RAMP_16BIT, +}; + +static const char * const dbgfs_attr_source[] = { + [AD3552R_SRC_NORMAL] = "normal", + [AD3552R_SRC_RAMP_16BIT] = "ramp-16bit", }; static int ad3552r_hs_reg_read(struct ad3552r_hs_state *st, u32 reg, u32 *val, @@ -65,6 +78,20 @@ static int ad3552r_hs_reg_read(struct ad3552r_hs_state *st, u32 reg, u32 *val, return st->data->bus_reg_read(st->back, reg, val, xfer_size); } +static int ad3552r_hs_set_data_source(struct ad3552r_hs_state *st, + enum iio_backend_data_source type) +{ + int i, ret; + + for (i = 0; i < st->model_data->num_hw_channels; ++i) { + ret = iio_backend_data_source_set(st->back, i, type); + if (ret) + return ret; + } + + return 0; +} + static int ad3552r_hs_update_reg_bits(struct ad3552r_hs_state *st, u32 reg, u32 mask, u32 val, size_t xfer_size) { @@ -464,6 +491,122 @@ static int ad3552r_hs_setup_custom_gain(struct ad3552r_hs_state *st, gain, 1); } +static int ad3552r_hs_reg_access(struct iio_dev *indio_dev, unsigned int reg, + unsigned int writeval, unsigned int *readval) +{ + struct ad3552r_hs_state *st = iio_priv(indio_dev); + + if (reg > st->model_data->max_reg_addr) + return -EINVAL; + + /* + * There are 8, 16 or 24 bit registers, but HDL supports only reading 8 + * or 16 bit data, not 24. So, also to avoid to check any proper read + * alignment, supporting only 8-bit readings here. + */ + if (readval) + return ad3552r_hs_reg_read(st, reg, readval, 1); + + return st->data->bus_reg_write(st->back, reg, writeval, 1); +} + +static ssize_t ad3552r_hs_show_data_source(struct file *f, char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct ad3552r_hs_state *st = file_inode(f)->i_private; + enum iio_backend_data_source type; + int idx, ret; + + guard(mutex)(&st->lock); + + ret = iio_backend_data_source_get(st->back, 0, &type); + if (ret) + return ret; + + switch (type) { + case IIO_BACKEND_INTERNAL_RAMP_16BIT: + idx = AD3552R_SRC_RAMP_16BIT; + break; + case IIO_BACKEND_EXTERNAL: + idx = AD3552R_SRC_NORMAL; + break; + default: + return -EINVAL; + } + + return simple_read_from_buffer(userbuf, count, ppos, + dbgfs_attr_source[idx], + strlen(dbgfs_attr_source[idx])); +} + +static ssize_t ad3552r_hs_write_data_source(struct file *f, + const char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct ad3552r_hs_state *st = file_inode(f)->i_private; + char buf[64]; + int ret, source; + + guard(mutex)(&st->lock); + + ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, userbuf, + count); + if (ret < 0) + return ret; + + buf[count] = '\0'; + + ret = match_string(dbgfs_attr_source, ARRAY_SIZE(dbgfs_attr_source), + buf); + if (ret < 0) + return ret; + + switch (ret) { + case AD3552R_SRC_RAMP_16BIT: + source = IIO_BACKEND_INTERNAL_RAMP_16BIT; + break; + case AD3552R_SRC_NORMAL: + source = IIO_BACKEND_EXTERNAL; + break; + default: + return -EINVAL; + } + + ret = ad3552r_hs_set_data_source(st, source); + if (ret) + return ret; + + return count; +} + +static ssize_t ad3552r_hs_show_data_source_avail(struct file *f, + char __user *userbuf, + size_t count, loff_t *ppos) +{ + ssize_t len = 0; + char buf[128]; + int i; + + for (i = 0; i < ARRAY_SIZE(dbgfs_attr_source); i++) { + len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", + dbgfs_attr_source[i]); + } + buf[len - 1] = '\n'; + + return simple_read_from_buffer(userbuf, count, ppos, buf, len); +} + +static const struct file_operations ad3552r_hs_data_source_fops = { + .owner = THIS_MODULE, + .write = ad3552r_hs_write_data_source, + .read = ad3552r_hs_show_data_source, +}; + +static const struct file_operations ad3552r_hs_data_source_avail_fops = { + .owner = THIS_MODULE, + .read = ad3552r_hs_show_data_source_avail, +}; + static int ad3552r_hs_setup(struct ad3552r_hs_state *st) { u16 id; @@ -531,11 +674,7 @@ static int ad3552r_hs_setup(struct ad3552r_hs_state *st) if (ret) return ret; - ret = iio_backend_data_source_set(st->back, 0, IIO_BACKEND_EXTERNAL); - if (ret) - return ret; - - ret = iio_backend_data_source_set(st->back, 1, IIO_BACKEND_EXTERNAL); + ret = ad3552r_hs_set_data_source(st, IIO_BACKEND_EXTERNAL); if (ret) return ret; @@ -639,8 +778,29 @@ static const struct iio_chan_spec ad3552r_hs_channels[] = { static const struct iio_info ad3552r_hs_info = { .read_raw = &ad3552r_hs_read_raw, .write_raw = &ad3552r_hs_write_raw, + .debugfs_reg_access = &ad3552r_hs_reg_access, }; +static void ad3552r_hs_debugfs_init(struct iio_dev *indio_dev) +{ + struct ad3552r_hs_state *st = iio_priv(indio_dev); + struct dentry *d = iio_get_debugfs_dentry(indio_dev); + + if (!IS_ENABLED(CONFIG_DEBUG_FS)) + return; + + d = iio_get_debugfs_dentry(indio_dev); + if (!d) { + dev_warn(st->dev, "can't set debugfs in driver dir\n"); + return; + } + + debugfs_create_file("data_source", 0600, d, st, + &ad3552r_hs_data_source_fops); + debugfs_create_file("data_source_available", 0600, d, st, + &ad3552r_hs_data_source_avail_fops); +} + static int ad3552r_hs_probe(struct platform_device *pdev) { struct ad3552r_hs_state *st; @@ -685,7 +845,17 @@ static int ad3552r_hs_probe(struct platform_device *pdev) if (ret) return ret; - return devm_iio_device_register(&pdev->dev, indio_dev); + ret = devm_iio_device_register(&pdev->dev, indio_dev); + if (ret) + return ret; + + ret = devm_mutex_init(&pdev->dev, &st->lock); + if (ret) + return ret; + + ad3552r_hs_debugfs_init(indio_dev); + + return ret; } static const struct of_device_id ad3552r_hs_of_id[] = { |