drivers/input/rmi4/rmi_f55.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2012-2015 Synaptics Incorporated
   4  * Copyright (C) 2016 Zodiac Inflight Innovations
   5  */
   6
   7 #include <linux/bitops.h>
   8 #include <linux/kernel.h>
   9 #include <linux/rmi.h>
  10 #include <linux/slab.h>
  11 #include "rmi_driver.h"
  12
  13 #define F55_NAME                "rmi4_f55"
  14
  15 /* F55 data offsets */
  16 #define F55_NUM_RX_OFFSET       0
  17 #define F55_NUM_TX_OFFSET       1
  18 #define F55_PHYS_CHAR_OFFSET    2
  19
  20 /* Only read required query registers */
  21 #define F55_QUERY_LEN           3
  22
  23 /* F55 capabilities */
  24 #define F55_CAP_SENSOR_ASSIGN   BIT(0)
  25
  26 struct f55_data {
  27         struct rmi_function *fn;
  28
  29         u8 qry[F55_QUERY_LEN];
  30         u8 num_rx_electrodes;
  31         u8 cfg_num_rx_electrodes;
  32         u8 num_tx_electrodes;
  33         u8 cfg_num_tx_electrodes;
  34 };
  35
  36 static int rmi_f55_detect(struct rmi_function *fn)
  37 {
  38         struct rmi_device *rmi_dev = fn->rmi_dev;
  39         struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev);
  40         struct f55_data *f55;
  41         int error;
  42
  43         f55 = dev_get_drvdata(&fn->dev);
  44
  45         error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr,
  46                                &f55->qry, sizeof(f55->qry));
  47         if (error) {
  48                 dev_err(&fn->dev, "%s: Failed to query F55 properties\n",
  49                         __func__);
  50                 return error;
  51         }
  52
  53         f55->num_rx_electrodes = f55->qry[F55_NUM_RX_OFFSET];
  54         f55->num_tx_electrodes = f55->qry[F55_NUM_TX_OFFSET];
  55
  56         f55->cfg_num_rx_electrodes = f55->num_rx_electrodes;
  57         f55->cfg_num_tx_electrodes = f55->num_rx_electrodes;
  58
  59         drv_data->num_rx_electrodes = f55->cfg_num_rx_electrodes;
  60         drv_data->num_tx_electrodes = f55->cfg_num_rx_electrodes;
  61
  62         if (f55->qry[F55_PHYS_CHAR_OFFSET] & F55_CAP_SENSOR_ASSIGN) {
  63                 int i, total;
  64                 u8 buf[256];
  65
  66                 /*
  67                  * Calculate the number of enabled receive and transmit
  68                  * electrodes by reading F55:Ctrl1 (sensor receiver assignment)
  69                  * and F55:Ctrl2 (sensor transmitter assignment). The number of
  70                  * enabled electrodes is the sum of all field entries with a
  71                  * value other than 0xff.
  72                  */
  73                 error = rmi_read_block(fn->rmi_dev,
  74                                        fn->fd.control_base_addr + 1,
  75                                        buf, f55->num_rx_electrodes);
  76                 if (!error) {
  77                         total = 0;
  78                         for (i = 0; i < f55->num_rx_electrodes; i++) {
  79                                 if (buf[i] != 0xff)
  80                                         total++;
  81                         }
  82                         f55->cfg_num_rx_electrodes = total;
  83                         drv_data->num_rx_electrodes = total;
  84                 }
  85
  86                 error = rmi_read_block(fn->rmi_dev,
  87                                        fn->fd.control_base_addr + 2,
  88                                        buf, f55->num_tx_electrodes);
  89                 if (!error) {
  90                         total = 0;
  91                         for (i = 0; i < f55->num_tx_electrodes; i++) {
  92                                 if (buf[i] != 0xff)
  93                                         total++;
  94                         }
  95                         f55->cfg_num_tx_electrodes = total;
  96                         drv_data->num_tx_electrodes = total;
  97                 }
  98         }
  99
 100         rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F55 num_rx_electrodes: %d (raw %d)\n",
 101                 f55->cfg_num_rx_electrodes, f55->num_rx_electrodes);
 102         rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F55 num_tx_electrodes: %d (raw %d)\n",
 103                 f55->cfg_num_tx_electrodes, f55->num_tx_electrodes);
 104
 105         return 0;
 106 }
 107
 108 static int rmi_f55_probe(struct rmi_function *fn)
 109 {
 110         struct f55_data *f55;
 111
 112         f55 = devm_kzalloc(&fn->dev, sizeof(struct f55_data), GFP_KERNEL);
 113         if (!f55)
 114                 return -ENOMEM;
 115
 116         f55->fn = fn;
 117         dev_set_drvdata(&fn->dev, f55);
 118
 119         return rmi_f55_detect(fn);
 120 }
 121
 122 struct rmi_function_handler rmi_f55_handler = {
 123         .driver = {
 124                 .name = F55_NAME,
 125         },
 126         .func = 0x55,
 127         .probe = rmi_f55_probe,
 128 };