1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief GPIO NXP PCA9535 Driver Implementation |
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5 | * |
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6 | * @ingroup I2CGPIONXPPCA9535 |
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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/gpio-nxp-pca9535.h> |
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28 | |
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29 | typedef enum { |
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30 | GPIO_NXP_PCA9535_INPUT_PORT_0, |
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31 | GPIO_NXP_PCA9535_INPUT_PORT_1, |
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32 | GPIO_NXP_PCA9535_OUTPUT_PORT_0, |
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33 | GPIO_NXP_PCA9535_OUTPUT_PORT_1, |
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34 | GPIO_NXP_PCA9535_POL_INV_PORT_0, |
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35 | GPIO_NXP_PCA9535_POL_INV_PORT_1, |
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36 | GPIO_NXP_PCA9535_CONF_PORT_0, |
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37 | GPIO_NXP_PCA9535_CONF_PORT_1 |
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38 | } gpio_nxp_pca9535_port; |
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39 | |
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40 | static int gpio_nxp_pca9535_get_reg( |
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41 | i2c_dev *dev, |
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42 | gpio_nxp_pca9535_port port, |
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43 | uint16_t *val |
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44 | ) |
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45 | { |
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46 | uint8_t out[1] = { port }; |
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47 | uint8_t in[sizeof(*val)]; |
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48 | i2c_msg msgs[2] = { |
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49 | { |
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50 | .addr = dev->address, |
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51 | .flags = 0, |
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52 | .len = (uint16_t) sizeof(out), |
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53 | .buf = &out[0] |
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54 | }, { |
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55 | .addr = dev->address, |
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56 | .flags = I2C_M_RD, |
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57 | .len = (uint16_t) sizeof(in), |
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58 | .buf = &in[0] |
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59 | } |
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60 | }; |
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61 | int err; |
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62 | |
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63 | err = i2c_bus_transfer(dev->bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs)); |
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64 | *val = in[0] | (in[1] << 8); |
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65 | |
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66 | return err; |
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67 | } |
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68 | |
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69 | static int gpio_nxp_pca9535_set_reg( |
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70 | i2c_dev *dev, |
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71 | gpio_nxp_pca9535_port port, |
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72 | uint16_t val |
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73 | ) |
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74 | { |
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75 | uint8_t out[3] = { port, (uint8_t) val, (uint8_t) (val >> 8) }; |
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76 | i2c_msg msgs[1] = { |
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77 | { |
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78 | .addr = dev->address, |
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79 | .flags = 0, |
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80 | .len = (uint16_t) sizeof(out), |
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81 | .buf = &out[0] |
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82 | } |
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83 | }; |
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84 | |
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85 | return i2c_bus_transfer(dev->bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs)); |
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86 | } |
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87 | |
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88 | static int gpio_nxp_pca9535_ioctl( |
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89 | i2c_dev *dev, |
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90 | ioctl_command_t command, |
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91 | void *arg |
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92 | ) |
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93 | { |
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94 | uint16_t v16 = (uint16_t)(uintptr_t) arg; |
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95 | uint32_t v32 = (uint32_t)(uintptr_t) arg; |
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96 | int err; |
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97 | |
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98 | switch (command) { |
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99 | case GPIO_NXP_PCA9535_GET_INPUT: |
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100 | err = gpio_nxp_pca9535_get_reg(dev, GPIO_NXP_PCA9535_INPUT_PORT_0, arg); |
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101 | break; |
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102 | case GPIO_NXP_PCA9535_GET_OUTPUT: |
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103 | err = gpio_nxp_pca9535_get_reg(dev, GPIO_NXP_PCA9535_OUTPUT_PORT_0, arg); |
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104 | break; |
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105 | case GPIO_NXP_PCA9535_CLEAR_AND_SET_OUTPUT: |
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106 | i2c_bus_obtain(dev->bus); |
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107 | err = gpio_nxp_pca9535_get_reg(dev, GPIO_NXP_PCA9535_OUTPUT_PORT_0, &v16); |
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108 | if (err == 0) { |
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109 | v16 &= ~((uint16_t) v32); |
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110 | v16 |= (uint16_t) (v32 >> 16); |
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111 | err = gpio_nxp_pca9535_set_reg(dev, GPIO_NXP_PCA9535_OUTPUT_PORT_0, v16); |
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112 | } |
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113 | i2c_bus_release(dev->bus); |
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114 | break; |
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115 | case GPIO_NXP_PCA9535_SET_OUTPUT: |
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116 | err = gpio_nxp_pca9535_set_reg(dev, GPIO_NXP_PCA9535_OUTPUT_PORT_0, v16); |
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117 | break; |
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118 | case GPIO_NXP_PCA9535_GET_POL_INV: |
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119 | err = gpio_nxp_pca9535_get_reg(dev, GPIO_NXP_PCA9535_POL_INV_PORT_0, arg); |
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120 | break; |
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121 | case GPIO_NXP_PCA9535_SET_POL_INV: |
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122 | err = gpio_nxp_pca9535_set_reg(dev, GPIO_NXP_PCA9535_POL_INV_PORT_0, v16); |
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123 | break; |
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124 | case GPIO_NXP_PCA9535_GET_CONFIG: |
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125 | err = gpio_nxp_pca9535_get_reg(dev, GPIO_NXP_PCA9535_CONF_PORT_0, arg); |
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126 | break; |
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127 | case GPIO_NXP_PCA9535_SET_CONFIG: |
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128 | err = gpio_nxp_pca9535_set_reg(dev, GPIO_NXP_PCA9535_CONF_PORT_0, v16); |
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129 | break; |
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130 | default: |
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131 | err = -ENOTTY; |
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132 | break; |
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133 | } |
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134 | |
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135 | return err; |
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136 | } |
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137 | |
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138 | int i2c_dev_register_gpio_nxp_pca9535( |
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139 | const char *bus_path, |
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140 | const char *dev_path, |
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141 | uint16_t address |
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142 | ) |
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143 | { |
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144 | i2c_dev *dev; |
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145 | |
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146 | dev = i2c_dev_alloc_and_init(sizeof(*dev), bus_path, address); |
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147 | if (dev == NULL) { |
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148 | return -1; |
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149 | } |
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150 | |
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151 | dev->ioctl = gpio_nxp_pca9535_ioctl; |
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152 | |
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153 | return i2c_dev_register(dev, dev_path); |
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154 | } |
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