drivers/misc/isl29020.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * isl29020.c - Intersil  ALS Driver
   4  *
   5  * Copyright (C) 2008 Intel Corp
   6  *
   7  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  10  *
  11  * Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/i2c.h>
  17 #include <linux/err.h>
  18 #include <linux/delay.h>
  19 #include <linux/sysfs.h>
  20 #include <linux/pm_runtime.h>
  21
  22 static DEFINE_MUTEX(mutex);
  23
  24 static ssize_t als_sensing_range_show(struct device *dev,
  25                         struct device_attribute *attr,  char *buf)
  26 {
  27         struct i2c_client *client = to_i2c_client(dev);
  28         int  val;
  29
  30         val = i2c_smbus_read_byte_data(client, 0x00);
  31
  32         if (val < 0)
  33                 return val;
  34         return sprintf(buf, "%d000\n", 1 << (2 * (val & 3)));
  35
  36 }
  37
  38 static ssize_t als_lux_input_data_show(struct device *dev,
  39                         struct device_attribute *attr, char *buf)
  40 {
  41         struct i2c_client *client = to_i2c_client(dev);
  42         int ret_val, val;
  43         unsigned long int lux;
  44         int temp;
  45
  46         pm_runtime_get_sync(dev);
  47         msleep(100);
  48
  49         mutex_lock(&mutex);
  50         temp = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */
  51         if (temp < 0) {
  52                 pm_runtime_put_sync(dev);
  53                 mutex_unlock(&mutex);
  54                 return temp;
  55         }
  56
  57         ret_val = i2c_smbus_read_byte_data(client, 0x01); /* LSB data */
  58         mutex_unlock(&mutex);
  59
  60         if (ret_val < 0) {
  61                 pm_runtime_put_sync(dev);
  62                 return ret_val;
  63         }
  64
  65         ret_val |= temp << 8;
  66         val = i2c_smbus_read_byte_data(client, 0x00);
  67         pm_runtime_put_sync(dev);
  68         if (val < 0)
  69                 return val;
  70         lux = ((((1 << (2 * (val & 3))))*1000) * ret_val) / 65536;
  71         return sprintf(buf, "%lu\n", lux);
  72 }
  73
  74 static ssize_t als_sensing_range_store(struct device *dev,
  75                 struct device_attribute *attr, const  char *buf, size_t count)
  76 {
  77         struct i2c_client *client = to_i2c_client(dev);
  78         int ret_val;
  79         unsigned long val;
  80
  81         ret_val = kstrtoul(buf, 10, &val);
  82         if (ret_val)
  83                 return ret_val;
  84
  85         if (val < 1 || val > 64000)
  86                 return -EINVAL;
  87
  88         /* Pick the smallest sensor range that will meet our requirements */
  89         if (val <= 1000)
  90                 val = 1;
  91         else if (val <= 4000)
  92                 val = 2;
  93         else if (val <= 16000)
  94                 val = 3;
  95         else
  96                 val = 4;
  97
  98         ret_val = i2c_smbus_read_byte_data(client, 0x00);
  99         if (ret_val < 0)
 100                 return ret_val;
 101
 102         ret_val &= 0xFC; /*reset the bit before setting them */
 103         ret_val |= val - 1;
 104         ret_val = i2c_smbus_write_byte_data(client, 0x00, ret_val);
 105
 106         if (ret_val < 0)
 107                 return ret_val;
 108         return count;
 109 }
 110
 111 static void als_set_power_state(struct i2c_client *client, int enable)
 112 {
 113         int ret_val;
 114
 115         ret_val = i2c_smbus_read_byte_data(client, 0x00);
 116         if (ret_val < 0)
 117                 return;
 118
 119         if (enable)
 120                 ret_val |= 0x80;
 121         else
 122                 ret_val &= 0x7F;
 123
 124         i2c_smbus_write_byte_data(client, 0x00, ret_val);
 125 }
 126
 127 static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR,
 128         als_sensing_range_show, als_sensing_range_store);
 129 static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux_input_data_show, NULL);
 130
 131 static struct attribute *mid_att_als[] = {
 132         &dev_attr_lux0_sensor_range.attr,
 133         &dev_attr_lux0_input.attr,
 134         NULL
 135 };
 136
 137 static const struct attribute_group m_als_gr = {
 138         .name = "isl29020",
 139         .attrs = mid_att_als
 140 };
 141
 142 static int als_set_default_config(struct i2c_client *client)
 143 {
 144         int retval;
 145
 146         retval = i2c_smbus_write_byte_data(client, 0x00, 0xc0);
 147         if (retval < 0) {
 148                 dev_err(&client->dev, "default write failed.");
 149                 return retval;
 150         }
 151         return 0;
 152 }
 153
 154 static int  isl29020_probe(struct i2c_client *client)
 155 {
 156         int res;
 157
 158         res = als_set_default_config(client);
 159         if (res <  0)
 160                 return res;
 161
 162         res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
 163         if (res) {
 164                 dev_err(&client->dev, "isl29020: device create file failed\n");
 165                 return res;
 166         }
 167         dev_info(&client->dev, "%s isl29020: ALS chip found\n", client->name);
 168         als_set_power_state(client, 0);
 169         pm_runtime_enable(&client->dev);
 170         return res;
 171 }
 172
 173 static void isl29020_remove(struct i2c_client *client)
 174 {
 175         pm_runtime_disable(&client->dev);
 176         sysfs_remove_group(&client->dev.kobj, &m_als_gr);
 177 }
 178
 179 static const struct i2c_device_id isl29020_id[] = {
 180         { "isl29020" },
 181         { }
 182 };
 183
 184 MODULE_DEVICE_TABLE(i2c, isl29020_id);
 185
 186 #ifdef CONFIG_PM
 187
 188 static int isl29020_runtime_suspend(struct device *dev)
 189 {
 190         struct i2c_client *client = to_i2c_client(dev);
 191         als_set_power_state(client, 0);
 192         return 0;
 193 }
 194
 195 static int isl29020_runtime_resume(struct device *dev)
 196 {
 197         struct i2c_client *client = to_i2c_client(dev);
 198         als_set_power_state(client, 1);
 199         return 0;
 200 }
 201
 202 static const struct dev_pm_ops isl29020_pm_ops = {
 203         .runtime_suspend = isl29020_runtime_suspend,
 204         .runtime_resume = isl29020_runtime_resume,
 205 };
 206
 207 #define ISL29020_PM_OPS (&isl29020_pm_ops)
 208 #else   /* CONFIG_PM */
 209 #define ISL29020_PM_OPS NULL
 210 #endif  /* CONFIG_PM */
 211
 212 static struct i2c_driver isl29020_driver = {
 213         .driver = {
 214                 .name = "isl29020",
 215                 .pm = ISL29020_PM_OPS,
 216         },
 217         .probe = isl29020_probe,
 218         .remove = isl29020_remove,
 219         .id_table = isl29020_id,
 220 };
 221
 222 module_i2c_driver(isl29020_driver);
 223
 224 MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com>");
 225 MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");
 226 MODULE_LICENSE("GPL v2");