src/drivers/i2c/pca9538/pca9538.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <device/i2c_bus.h>
   4 #include <device/device.h>
   5 #include "pca9538.h"
   6 #include "chip.h"
   7
   8 /* This function can be used from outside the chip driver to read input. */
   9 uint8_t pca9538_read_input(void)
  10 {
  11         struct device *dev = pca9538_get_dev();
  12
  13         if (!dev)
  14                 return 0;
  15         else
  16                 return (uint8_t)(i2c_dev_readb_at(dev, INPUT_REG));
  17 }
  18
  19 /* This function can be used from outside the chip driver to set output. */
  20 void pca9538_set_output(uint8_t val)
  21 {
  22         struct device *dev = pca9538_get_dev();
  23
  24         if (dev)
  25                 i2c_dev_writeb_at(dev, OUTPUT_REG, val);
  26 }
  27
  28 static void pca9538_init(struct device *dev)
  29 {
  30         struct drivers_i2c_pca9538_config *config = dev->chip_info;
  31
  32         if (!config)
  33                 return;
  34         /* Set up registers as requested in devicetree. */
  35         i2c_dev_writeb_at(dev, INPUT_INVERT_REG, config->invert);
  36         i2c_dev_writeb_at(dev, OUTPUT_REG, config->out_val);
  37         i2c_dev_writeb_at(dev, IO_CONFIG_REG, config->in_out);
  38 }
  39
  40 static struct device_operations pca9538_ops = {
  41         .read_resources         = noop_read_resources,
  42         .set_resources          = noop_set_resources,
  43         .init                   = pca9538_init,
  44 };
  45
  46 static void pca9538_enable(struct device *dev)
  47 {
  48         dev->ops = &pca9538_ops;
  49 }
  50
  51 struct chip_operations drivers_i2c_pca9538_ops = {
  52         .name = "PCA9538",
  53         .enable_dev = pca9538_enable
  54 };