1 /* 2 * HID Sensors Driver 3 * Copyright (c) 2012, Intel Corporation. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms and conditions of the GNU General Public License, 7 * version 2, as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program; if not, write to the Free Software Foundation, Inc., 16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 */ 19 #include <linux/device.h> 20 #include <linux/platform_device.h> 21 #include <linux/module.h> 22 #include <linux/interrupt.h> 23 #include <linux/irq.h> 24 #include <linux/slab.h> 25 #include <linux/delay.h> 26 #include <linux/hid-sensor-hub.h> 27 #include <linux/iio/iio.h> 28 #include <linux/iio/trigger.h> 29 #include <linux/iio/sysfs.h> 30 #include "hid-sensor-trigger.h" 31 32 static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state) 33 { 34 int state_val; 35 int report_val; 36 s32 poll_value = 0; 37 38 if (state) { 39 if (!atomic_read(&st->user_requested_state)) 40 return 0; 41 if (sensor_hub_device_open(st->hsdev)) 42 return -EIO; 43 44 atomic_inc(&st->data_ready); 45 46 state_val = hid_sensor_get_usage_index(st->hsdev, 47 st->power_state.report_id, 48 st->power_state.index, 49 HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM); 50 report_val = hid_sensor_get_usage_index(st->hsdev, 51 st->report_state.report_id, 52 st->report_state.index, 53 HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM); 54 55 poll_value = hid_sensor_read_poll_value(st); 56 } else { 57 int val; 58 59 val = atomic_dec_if_positive(&st->data_ready); 60 if (val < 0) 61 return 0; 62 63 sensor_hub_device_close(st->hsdev); 64 state_val = hid_sensor_get_usage_index(st->hsdev, 65 st->power_state.report_id, 66 st->power_state.index, 67 HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM); 68 report_val = hid_sensor_get_usage_index(st->hsdev, 69 st->report_state.report_id, 70 st->report_state.index, 71 HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM); 72 } 73 74 if (state_val >= 0) { 75 state_val += st->power_state.logical_minimum; 76 sensor_hub_set_feature(st->hsdev, st->power_state.report_id, 77 st->power_state.index, sizeof(state_val), 78 &state_val); 79 } 80 81 if (report_val >= 0) { 82 report_val += st->report_state.logical_minimum; 83 sensor_hub_set_feature(st->hsdev, st->report_state.report_id, 84 st->report_state.index, 85 sizeof(report_val), 86 &report_val); 87 } 88 89 sensor_hub_get_feature(st->hsdev, st->power_state.report_id, 90 st->power_state.index, 91 sizeof(state_val), &state_val); 92 if (state && poll_value) 93 msleep_interruptible(poll_value * 2); 94 95 return 0; 96 } 97 EXPORT_SYMBOL(hid_sensor_power_state); 98 99 int hid_sensor_power_state(struct hid_sensor_common *st, bool state) 100 { 101 102 #ifdef CONFIG_PM 103 int ret; 104 105 atomic_set(&st->user_requested_state, state); 106 if (state) 107 ret = pm_runtime_get_sync(&st->pdev->dev); 108 else { 109 pm_runtime_mark_last_busy(&st->pdev->dev); 110 ret = pm_runtime_put_autosuspend(&st->pdev->dev); 111 } 112 if (ret < 0) { 113 if (state) 114 pm_runtime_put_noidle(&st->pdev->dev); 115 return ret; 116 } 117 118 return 0; 119 #else 120 atomic_set(&st->user_requested_state, state); 121 return _hid_sensor_power_state(st, state); 122 #endif 123 } 124 125 static void hid_sensor_set_power_work(struct work_struct *work) 126 { 127 struct hid_sensor_common *attrb = container_of(work, 128 struct hid_sensor_common, 129 work); 130 _hid_sensor_power_state(attrb, true); 131 } 132 133 static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig, 134 bool state) 135 { 136 return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state); 137 } 138 139 void hid_sensor_remove_trigger(struct hid_sensor_common *attrb) 140 { 141 cancel_work_sync(&attrb->work); 142 iio_trigger_unregister(attrb->trigger); 143 iio_trigger_free(attrb->trigger); 144 } 145 EXPORT_SYMBOL(hid_sensor_remove_trigger); 146 147 static const struct iio_trigger_ops hid_sensor_trigger_ops = { 148 .owner = THIS_MODULE, 149 .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state, 150 }; 151 152 int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name, 153 struct hid_sensor_common *attrb) 154 { 155 int ret; 156 struct iio_trigger *trig; 157 158 trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id); 159 if (trig == NULL) { 160 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n"); 161 ret = -ENOMEM; 162 goto error_ret; 163 } 164 165 trig->dev.parent = indio_dev->dev.parent; 166 iio_trigger_set_drvdata(trig, attrb); 167 trig->ops = &hid_sensor_trigger_ops; 168 ret = iio_trigger_register(trig); 169 170 if (ret) { 171 dev_err(&indio_dev->dev, "Trigger Register Failed\n"); 172 goto error_free_trig; 173 } 174 attrb->trigger = trig; 175 indio_dev->trig = iio_trigger_get(trig); 176 177 ret = pm_runtime_set_active(&indio_dev->dev); 178 if (ret) 179 goto error_unreg_trigger; 180 181 iio_device_set_drvdata(indio_dev, attrb); 182 183 INIT_WORK(&attrb->work, hid_sensor_set_power_work); 184 185 pm_suspend_ignore_children(&attrb->pdev->dev, true); 186 pm_runtime_enable(&attrb->pdev->dev); 187 /* Default to 3 seconds, but can be changed from sysfs */ 188 pm_runtime_set_autosuspend_delay(&attrb->pdev->dev, 189 3000); 190 pm_runtime_use_autosuspend(&attrb->pdev->dev); 191 192 return ret; 193 error_unreg_trigger: 194 iio_trigger_unregister(trig); 195 error_free_trig: 196 iio_trigger_free(trig); 197 error_ret: 198 return ret; 199 } 200 EXPORT_SYMBOL(hid_sensor_setup_trigger); 201 202 static int __maybe_unused hid_sensor_suspend(struct device *dev) 203 { 204 struct platform_device *pdev = to_platform_device(dev); 205 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 206 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev); 207 208 return _hid_sensor_power_state(attrb, false); 209 } 210 211 static int __maybe_unused hid_sensor_resume(struct device *dev) 212 { 213 struct platform_device *pdev = to_platform_device(dev); 214 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 215 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev); 216 schedule_work(&attrb->work); 217 return 0; 218 } 219 220 static int __maybe_unused hid_sensor_runtime_resume(struct device *dev) 221 { 222 struct platform_device *pdev = to_platform_device(dev); 223 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 224 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev); 225 return _hid_sensor_power_state(attrb, true); 226 } 227 228 const struct dev_pm_ops hid_sensor_pm_ops = { 229 SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume) 230 SET_RUNTIME_PM_OPS(hid_sensor_suspend, 231 hid_sensor_runtime_resume, NULL) 232 }; 233 EXPORT_SYMBOL(hid_sensor_pm_ops); 234 235 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); 236 MODULE_DESCRIPTION("HID Sensor trigger processing"); 237 MODULE_LICENSE("GPL"); 238