#ifdef CONFIG_IG69M /* iWave board revision is combination of pcb revsion and bom revision */ struct ig_board_rev_nr { char pcb_rev; char bom_rev; }; unsigned int data; int channel = 0, ret = 0; static int ig_get_bom_revision(struct ig_board_rev_nr *board_rev, unsigned int raw, int bom_rev_flag) { if (!bom_rev_flag) { switch (raw) { case 0 ... 100: board_rev->bom_rev = '0'; break; case 300 ... 450: board_rev->bom_rev = '1'; break; case 600 ... 850: board_rev->bom_rev = '2'; break; case 1150 ... 1450: board_rev->bom_rev = '3'; break; case 1500 ... 1800: board_rev->bom_rev = '4'; break; case 1900 ... 2200: board_rev->bom_rev = '5'; break; case 2300 ... 2600: board_rev->bom_rev = '6'; break; case 2650 ... 2950: board_rev->bom_rev = '7'; break; case 3200 ... 3450: board_rev->bom_rev = '8'; break; case 3500 ... 3650: board_rev->bom_rev = '9'; break; case 4000 ... 4150: board_rev->bom_rev = 'A'; break; default: board_rev->bom_rev = 'x'; } } else { switch (raw) { case 0 ... 100: board_rev->bom_rev = '0'; break; case 300 ... 450: board_rev->bom_rev = '1'; break; case 600 ... 850: board_rev->bom_rev = '2'; break; case 1150 ... 1450: board_rev->bom_rev = '3'; break; case 1500 ... 1800: board_rev->bom_rev = '4'; break; case 1900 ... 2200: board_rev->bom_rev = '5'; break; case 2300 ... 2600: board_rev->bom_rev = '6'; break; case 2650 ... 2950: board_rev->bom_rev = '7'; break; case 3200 ... 3450: board_rev->bom_rev = '8'; break; case 3500 ... 3650: board_rev->bom_rev = '9'; break; case 4000 ... 4150: board_rev->bom_rev = 'A'; break; default: board_rev->bom_rev = 'x'; } } return 0; } /* Read the adc value based on the dts pin configuration */ static int adc_measurement(struct device_node *node, int adc_count, struct ig_board_rev_nr *board_rev) { struct of_phandle_args adc_args; struct device *adc_dev; struct iio_dev *indio_dev; struct iio_channel chan; unsigned int raw; int ret, uV; int i; int index; int bom_rev_flag = 0; for (i = 0; i < adc_count; i++) { ret = of_parse_phandle_with_args(node, "ig69m-adc", "#io-channel-cells", i, &adc_args); if (ret) { pr_err("can't find /config/ig,adc_som_rev\n"); return 0; } /* Resolve the phandle's device_node to its iio_dev. * "ig69m-adc" is a custom property name (not the * standard "io-channels"/"io-channel-names" pair), so * the public fwnode_iio_channel_get_by_name()/ * iio_channel_get() consumer APIs cannot be used here - * neither accepts an arbitrary property name + index. * bus_find_device_by_of_node() + dev_to_iio_dev() is * the same resolution path IIO's own (non-exported) * of_iio_channel_get() uses internally. */ adc_dev = bus_find_device_by_of_node(&iio_bus_type, adc_args.np); of_node_put(adc_args.np); if (!adc_dev) { pr_err("Can't get adc device for channel %d\n", i); return -ENODEV; } indio_dev = dev_to_iio_dev(adc_dev); index = adc_args.args_count ? adc_args.args[0] : 0; if (index >= indio_dev->num_channels) { pr_err("ADC channel index %d out of range for %s\n", index, dev_name(adc_dev)); put_device(adc_dev); return -EINVAL; } chan.indio_dev = indio_dev; chan.channel = &indio_dev->channels[index]; chan.data = NULL; ret = iio_read_channel_raw(&chan, (int *)&raw); if (ret) { pr_err("single shot failed for ADC[%d]!\n", index); put_device(adc_dev); return ret; } /* Convert to uV */ ret = iio_read_channel_processed(&chan, &uV); if (ret >= 0) { if (i == 0) { switch (raw) { case 0 ... 100: board_rev->pcb_rev = '1'; bom_rev_flag = 0; break; case 300 ... 450: board_rev->pcb_rev = '1'; bom_rev_flag = 1; break; case 600 ... 850: board_rev->pcb_rev = '2'; bom_rev_flag = 0; break; case 1150 ... 1450: board_rev->pcb_rev = '2'; bom_rev_flag = 1; break; case 1500 ... 1800: board_rev->pcb_rev = '3'; bom_rev_flag = 0; break; case 1900 ... 2200: board_rev->pcb_rev = '3'; bom_rev_flag = 1; break; case 2300 ... 2600: board_rev->pcb_rev = '4'; bom_rev_flag = 0; break; case 2650 ... 2950: board_rev->pcb_rev = '4'; bom_rev_flag = 1; break; case 3200 ... 3450: board_rev->pcb_rev = '5'; bom_rev_flag = 0; break; case 3500 ... 3650: board_rev->pcb_rev = '5'; bom_rev_flag = 1; break; case 3950 ... 4150: board_rev->pcb_rev = '6'; bom_rev_flag = 0; break; default: board_rev->pcb_rev = 'x'; } } else { ig_get_bom_revision(board_rev, raw, bom_rev_flag); } } else { pr_err("Can't get uV value for ADC[%d]\n", index); } put_device(adc_dev); } return 0; } static int board_get_som_revision(struct ig_board_rev_nr *board_rev) { struct device_node *node; int adc_count, ret; node = of_find_node_by_path("/config"); if (!node) { pr_err("no /config node?\n"); return -ENOENT; } /* * Retrieve the ADC channels devices and get measurement * for each of them */ adc_count = of_count_phandle_with_args(node, "ig69m-adc", "#io-channel-cells"); if (adc_count < 0) { of_node_put(node); if (adc_count == -ENOENT) return 0; pr_err("Can't find adc channel (%d)\n", adc_count); return adc_count; } ret = adc_measurement(node, adc_count, board_rev); of_node_put(node); if (ret) return ret; return 0; } static void print_board_info (void) { struct ig_board_rev_nr *board_rev1; int ret; board_rev1 = kzalloc(sizeof(struct ig_board_rev_nr), GFP_KERNEL); if (!board_rev1) { pr_err("Failed to allocate board_rev\n"); return; } /* IG69M: Get board revision */ ret = board_get_som_revision(board_rev1); if (ret) { pr_err("Failed to read SOM revision (%d)\n", ret); kfree(board_rev1); return; } pr_info("\nBoard Info:\n"); pr_info("\tSOM Version : iG-PRJRZ-AP-01-R%c.%c\n", board_rev1->pcb_rev, board_rev1->bom_rev); kfree(board_rev1); } #endif