diff options
Diffstat (limited to 'drivers/iio/adc/ti-adc081c.c')
| -rw-r--r-- | drivers/iio/adc/ti-adc081c.c | 150 |
1 files changed, 57 insertions, 93 deletions
diff --git a/drivers/iio/adc/ti-adc081c.c b/drivers/iio/adc/ti-adc081c.c index 319172cf7da8..8ef51c57912d 100644 --- a/drivers/iio/adc/ti-adc081c.c +++ b/drivers/iio/adc/ti-adc081c.c @@ -1,17 +1,14 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * TI ADC081C/ADC101C/ADC121C 8/10/12-bit ADC driver * * Copyright (C) 2012 Avionic Design GmbH * Copyright (C) 2016 Intel * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * * Datasheets: - * http://www.ti.com/lit/ds/symlink/adc081c021.pdf - * http://www.ti.com/lit/ds/symlink/adc101c021.pdf - * http://www.ti.com/lit/ds/symlink/adc121c021.pdf + * https://www.ti.com/lit/ds/symlink/adc081c021.pdf + * https://www.ti.com/lit/ds/symlink/adc101c021.pdf + * https://www.ti.com/lit/ds/symlink/adc121c021.pdf * * The devices have a very similar interface and differ mostly in the number of * bits handled. For the 8-bit and 10-bit models the least-significant 4 or 2 @@ -21,8 +18,8 @@ #include <linux/err.h> #include <linux/i2c.h> #include <linux/module.h> -#include <linux/of.h> -#include <linux/acpi.h> +#include <linux/mod_devicetable.h> +#include <linux/property.h> #include <linux/iio/iio.h> #include <linux/iio/buffer.h> @@ -36,6 +33,12 @@ struct adc081c { /* 8, 10 or 12 */ int bits; + + /* Ensure natural alignment of buffer elements */ + struct { + u16 channel; + aligned_s64 ts; + } scan; }; #define REG_CONV_RES 0x00 @@ -99,32 +102,27 @@ struct adcxx1c_model { int bits; }; -#define ADCxx1C_MODEL(_name, _bits) \ - { \ - .channels = _name ## _channels, \ - .bits = (_bits), \ - } - DEFINE_ADCxx1C_CHANNELS(adc081c, 8); DEFINE_ADCxx1C_CHANNELS(adc101c, 10); DEFINE_ADCxx1C_CHANNELS(adc121c, 12); -/* Model ids are indexes in _models array */ -enum adcxx1c_model_id { - ADC081C = 0, - ADC101C = 1, - ADC121C = 2, +static const struct adcxx1c_model adc081c_model = { + .channels = adc081c_channels, + .bits = 8, }; -static struct adcxx1c_model adcxx1c_models[] = { - ADCxx1C_MODEL(adc081c, 8), - ADCxx1C_MODEL(adc101c, 10), - ADCxx1C_MODEL(adc121c, 12), +static const struct adcxx1c_model adc101c_model = { + .channels = adc101c_channels, + .bits = 10, +}; + +static const struct adcxx1c_model adc121c_model = { + .channels = adc121c_channels, + .bits = 12, }; static const struct iio_info adc081c_info = { .read_raw = adc081c_read_raw, - .driver_module = THIS_MODULE, }; static irqreturn_t adc081c_trigger_handler(int irq, void *p) @@ -132,42 +130,35 @@ static irqreturn_t adc081c_trigger_handler(int irq, void *p) struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct adc081c *data = iio_priv(indio_dev); - u16 buf[8]; /* 2 bytes data + 6 bytes padding + 8 bytes timestamp */ int ret; ret = i2c_smbus_read_word_swapped(data->i2c, REG_CONV_RES); if (ret < 0) goto out; - buf[0] = ret; - iio_push_to_buffers_with_timestamp(indio_dev, buf, - iio_get_time_ns(indio_dev)); + data->scan.channel = ret; + iio_push_to_buffers_with_ts(indio_dev, &data->scan, sizeof(data->scan), + iio_get_time_ns(indio_dev)); out: iio_trigger_notify_done(indio_dev->trig); return IRQ_HANDLED; } -static int adc081c_probe(struct i2c_client *client, - const struct i2c_device_id *id) +static void adc081c_reg_disable(void *reg) +{ + regulator_disable(reg); +} + +static int adc081c_probe(struct i2c_client *client) { struct iio_dev *iio; struct adc081c *adc; - struct adcxx1c_model *model; + const struct adcxx1c_model *model; int err; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) return -EOPNOTSUPP; - if (ACPI_COMPANION(&client->dev)) { - const struct acpi_device_id *ad_id; - - ad_id = acpi_match_device(client->dev.driver->acpi_match_table, - &client->dev); - if (!ad_id) - return -ENODEV; - model = &adcxx1c_models[ad_id->driver_data]; - } else { - model = &adcxx1c_models[id->driver_data]; - } + model = i2c_get_match_data(client); iio = devm_iio_device_alloc(&client->dev, sizeof(*adc)); if (!iio) @@ -185,8 +176,11 @@ static int adc081c_probe(struct i2c_client *client, if (err < 0) return err; - iio->dev.parent = &client->dev; - iio->dev.of_node = client->dev.of_node; + err = devm_add_action_or_reset(&client->dev, adc081c_reg_disable, + adc->ref); + if (err) + return err; + iio->name = dev_name(&client->dev); iio->modes = INDIO_DIRECT_MODE; iio->info = &adc081c_info; @@ -194,76 +188,46 @@ static int adc081c_probe(struct i2c_client *client, iio->channels = model->channels; iio->num_channels = ADC081C_NUM_CHANNELS; - err = iio_triggered_buffer_setup(iio, NULL, adc081c_trigger_handler, NULL); + err = devm_iio_triggered_buffer_setup(&client->dev, iio, NULL, + adc081c_trigger_handler, NULL); if (err < 0) { dev_err(&client->dev, "iio triggered buffer setup failed\n"); - goto err_regulator_disable; + return err; } - err = iio_device_register(iio); - if (err < 0) - goto err_buffer_cleanup; - - i2c_set_clientdata(client, iio); - - return 0; - -err_buffer_cleanup: - iio_triggered_buffer_cleanup(iio); -err_regulator_disable: - regulator_disable(adc->ref); - - return err; -} - -static int adc081c_remove(struct i2c_client *client) -{ - struct iio_dev *iio = i2c_get_clientdata(client); - struct adc081c *adc = iio_priv(iio); - - iio_device_unregister(iio); - iio_triggered_buffer_cleanup(iio); - regulator_disable(adc->ref); - - return 0; + return devm_iio_device_register(&client->dev, iio); } static const struct i2c_device_id adc081c_id[] = { - { "adc081c", ADC081C }, - { "adc101c", ADC101C }, - { "adc121c", ADC121C }, + { "adc081c", (kernel_ulong_t)&adc081c_model }, + { "adc101c", (kernel_ulong_t)&adc101c_model }, + { "adc121c", (kernel_ulong_t)&adc121c_model }, { } }; MODULE_DEVICE_TABLE(i2c, adc081c_id); -#ifdef CONFIG_OF -static const struct of_device_id adc081c_of_match[] = { - { .compatible = "ti,adc081c" }, - { .compatible = "ti,adc101c" }, - { .compatible = "ti,adc121c" }, +static const struct acpi_device_id adc081c_acpi_match[] = { + /* Used on some AAEON boards */ + { "ADC081C", (kernel_ulong_t)&adc081c_model }, { } }; -MODULE_DEVICE_TABLE(of, adc081c_of_match); -#endif +MODULE_DEVICE_TABLE(acpi, adc081c_acpi_match); -#ifdef CONFIG_ACPI -static const struct acpi_device_id adc081c_acpi_match[] = { - { "ADC081C", ADC081C }, - { "ADC101C", ADC101C }, - { "ADC121C", ADC121C }, +static const struct of_device_id adc081c_of_match[] = { + { .compatible = "ti,adc081c", .data = &adc081c_model }, + { .compatible = "ti,adc101c", .data = &adc101c_model }, + { .compatible = "ti,adc121c", .data = &adc121c_model }, { } }; -MODULE_DEVICE_TABLE(acpi, adc081c_acpi_match); -#endif +MODULE_DEVICE_TABLE(of, adc081c_of_match); static struct i2c_driver adc081c_driver = { .driver = { .name = "adc081c", - .of_match_table = of_match_ptr(adc081c_of_match), - .acpi_match_table = ACPI_PTR(adc081c_acpi_match), + .of_match_table = adc081c_of_match, + .acpi_match_table = adc081c_acpi_match, }, .probe = adc081c_probe, - .remove = adc081c_remove, .id_table = adc081c_id, }; module_i2c_driver(adc081c_driver); |