1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Switch NXP PCA9548A Driver Implementation |
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5 | * |
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6 | * @ingroup I2CSWITCHNXPPCA9548A |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2014 embedded brains GmbH. All rights reserved. |
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11 | * |
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12 | * embedded brains GmbH |
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13 | * Dornierstr. 4 |
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14 | * 82178 Puchheim |
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15 | * Germany |
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16 | * <rtems@embedded-brains.de> |
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17 | * |
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18 | * The license and distribution terms for this file may be |
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19 | * found in the file LICENSE in this distribution or at |
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20 | * http://www.rtems.org/license/LICENSE. |
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21 | */ |
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22 | |
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23 | #if HAVE_CONFIG_H |
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24 | #include "config.h" |
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25 | #endif |
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26 | |
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27 | #include <dev/i2c/switch-nxp-pca9548a.h> |
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28 | |
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29 | static int switch_nxp_pca9548a_do_get_control( |
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30 | i2c_dev *dev, |
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31 | uint8_t *val |
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32 | ) |
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33 | { |
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34 | i2c_msg msg = { |
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35 | .addr = dev->address, |
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36 | .flags = I2C_M_RD, |
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37 | .len = (uint16_t) sizeof(*val), |
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38 | .buf = val |
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39 | }; |
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40 | |
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41 | return i2c_bus_transfer(dev->bus, &msg, 1); |
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42 | } |
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43 | |
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44 | static int switch_nxp_pca9548a_do_set_control( |
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45 | i2c_dev *dev, |
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46 | uint8_t val |
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47 | ) |
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48 | { |
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49 | i2c_msg msg = { |
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50 | .addr = dev->address, |
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51 | .flags = 0, |
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52 | .len = (uint16_t) sizeof(val), |
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53 | .buf = &val |
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54 | }; |
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55 | |
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56 | return i2c_bus_transfer(dev->bus, &msg, 1); |
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57 | } |
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58 | |
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59 | static int switch_nxp_pca9548a_ioctl( |
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60 | i2c_dev *dev, |
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61 | ioctl_command_t command, |
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62 | void *arg |
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63 | ) |
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64 | { |
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65 | uint8_t v8 = (uint8_t)(uintptr_t) arg; |
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66 | int err; |
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67 | |
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68 | switch (command) { |
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69 | case SWITCH_NXP_PCA9548A_GET_CONTROL: |
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70 | err = switch_nxp_pca9548a_do_get_control(dev, arg); |
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71 | break; |
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72 | case SWITCH_NXP_PCA9548A_SET_CONTROL: |
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73 | err = switch_nxp_pca9548a_do_set_control(dev, v8); |
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74 | break; |
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75 | default: |
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76 | err = -ENOTTY; |
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77 | break; |
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78 | } |
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79 | |
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80 | return err; |
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81 | } |
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82 | |
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83 | int i2c_dev_register_switch_nxp_pca9548a( |
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84 | const char *bus_path, |
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85 | const char *dev_path, |
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86 | uint16_t address |
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87 | ) |
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88 | { |
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89 | i2c_dev *dev; |
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90 | |
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91 | dev = i2c_dev_alloc_and_init(sizeof(*dev), bus_path, address); |
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92 | if (dev == NULL) { |
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93 | return -1; |
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94 | } |
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95 | |
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96 | dev->ioctl = switch_nxp_pca9548a_ioctl; |
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97 | |
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98 | return i2c_dev_register(dev, dev_path); |
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99 | } |
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