1 /*
2 * Copyright (c) 2020 Henrik Brix Andersen <henrik@brixandersen.dk>
3 * Copyright (c) 2023, NXP
4 *
5 * SPDX-License-Identifier: Apache-2.0
6 */
7 #define DT_DRV_COMPAT nxp_lpdac
8
9 #include <zephyr/kernel.h>
10 #include <zephyr/drivers/dac.h>
11 #include <zephyr/logging/log.h>
12
13 #include <fsl_dac.h>
14
15 LOG_MODULE_REGISTER(dac_mcux_lpdac, CONFIG_DAC_LOG_LEVEL);
16
17 struct mcux_lpdac_config {
18 LPDAC_Type *base;
19 dac_reference_voltage_source_t ref_voltage;
20 bool low_power;
21 };
22
23 struct mcux_lpdac_data {
24 bool configured;
25 };
26
mcux_lpdac_channel_setup(const struct device * dev,const struct dac_channel_cfg * channel_cfg)27 static int mcux_lpdac_channel_setup(const struct device *dev,
28 const struct dac_channel_cfg *channel_cfg)
29 {
30 const struct mcux_lpdac_config *config = dev->config;
31 struct mcux_lpdac_data *data = dev->data;
32 dac_config_t dac_config;
33
34 if (channel_cfg->channel_id != 0) {
35 LOG_ERR("unsupported channel %d", channel_cfg->channel_id);
36 return -ENOTSUP;
37 }
38
39 if (channel_cfg->resolution != 12) {
40 LOG_ERR("unsupported resolution %d", channel_cfg->resolution);
41 return -ENOTSUP;
42 }
43
44 if (channel_cfg->internal) {
45 LOG_ERR("Internal channels not supported");
46 return -ENOTSUP;
47 }
48
49 DAC_GetDefaultConfig(&dac_config);
50 dac_config.referenceVoltageSource = config->ref_voltage;
51 #if defined(FSL_FEATURE_LPDAC_HAS_GCR_BUF_SPD_CTRL) && FSL_FEATURE_LPDAC_HAS_GCR_BUF_SPD_CTRL
52 dac_config.enableLowerLowPowerMode = config->low_power;
53 #else
54 dac_config.enableLowPowerMode = config->low_power;
55 #endif
56 DAC_Init(config->base, &dac_config);
57 DAC_Enable(config->base, false);
58 data->configured = true;
59
60 return 0;
61 }
62
mcux_lpdac_write_value(const struct device * dev,uint8_t channel,uint32_t value)63 static int mcux_lpdac_write_value(const struct device *dev, uint8_t channel, uint32_t value)
64 {
65 const struct mcux_lpdac_config *config = dev->config;
66 struct mcux_lpdac_data *data = dev->data;
67
68 if (!data->configured) {
69 LOG_ERR("channel not initialized");
70 return -EINVAL;
71 }
72
73 if (channel != 0) {
74 LOG_ERR("unsupported channel %d", channel);
75 return -ENOTSUP;
76 }
77
78 if (value >= 4096) {
79 LOG_ERR("unsupported value %d", value);
80 return -EINVAL;
81 }
82
83 DAC_Enable(config->base, true);
84 DAC_SetData(config->base, value);
85
86 return 0;
87 }
88
mcux_lpdac_init(const struct device * dev)89 static int mcux_lpdac_init(const struct device *dev)
90 {
91 return 0;
92 }
93
94 static DEVICE_API(dac, mcux_lpdac_driver_api) = {
95 .channel_setup = mcux_lpdac_channel_setup,
96 .write_value = mcux_lpdac_write_value,
97 };
98
99 #define MCUX_LPDAC_INIT(n) \
100 static struct mcux_lpdac_data mcux_lpdac_data_##n; \
101 \
102 static const struct mcux_lpdac_config mcux_lpdac_config_##n = { \
103 .base = (LPDAC_Type *)DT_INST_REG_ADDR(n), \
104 .ref_voltage = DT_INST_PROP(n, voltage_reference), \
105 .low_power = DT_INST_PROP(n, low_power_mode), \
106 }; \
107 \
108 DEVICE_DT_INST_DEFINE(n, mcux_lpdac_init, NULL, &mcux_lpdac_data_##n, \
109 &mcux_lpdac_config_##n, POST_KERNEL, CONFIG_DAC_INIT_PRIORITY, \
110 &mcux_lpdac_driver_api);
111
112 DT_INST_FOREACH_STATUS_OKAY(MCUX_LPDAC_INIT)
113
