1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Apple Motion Sensor driver 4 * 5 * Copyright (C) 2005 Stelian Pop (stelian@popies.net) 6 * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch) 7 */ 8 9 #include <linux/module.h> 10 #include <linux/types.h> 11 #include <linux/errno.h> 12 #include <linux/init.h> 13 #include <linux/of_platform.h> 14 #include <asm/pmac_pfunc.h> 15 16 #include "ams.h" 17 18 /* There is only one motion sensor per machine */ 19 struct ams ams_info; 20 21 static bool verbose; 22 module_param(verbose, bool, 0644); 23 MODULE_PARM_DESC(verbose, "Show free falls and shocks in kernel output"); 24 25 /* Call with ams_info.lock held! */ 26 void ams_sensors(s8 *x, s8 *y, s8 *z) 27 { 28 u32 orient = ams_info.vflag? ams_info.orient1 : ams_info.orient2; 29 30 if (orient & 0x80) 31 /* X and Y swapped */ 32 ams_info.get_xyz(y, x, z); 33 else 34 ams_info.get_xyz(x, y, z); 35 36 if (orient & 0x04) 37 *z = ~(*z); 38 if (orient & 0x02) 39 *y = ~(*y); 40 if (orient & 0x01) 41 *x = ~(*x); 42 } 43 44 static ssize_t ams_show_current(struct device *dev, 45 struct device_attribute *attr, char *buf) 46 { 47 s8 x, y, z; 48 49 mutex_lock(&ams_info.lock); 50 ams_sensors(&x, &y, &z); 51 mutex_unlock(&ams_info.lock); 52 53 return snprintf(buf, PAGE_SIZE, "%d %d %d\n", x, y, z); 54 } 55 56 static DEVICE_ATTR(current, S_IRUGO, ams_show_current, NULL); 57 58 static void ams_handle_irq(void *data) 59 { 60 enum ams_irq irq = *((enum ams_irq *)data); 61 62 spin_lock(&ams_info.irq_lock); 63 64 ams_info.worker_irqs |= irq; 65 schedule_work(&ams_info.worker); 66 67 spin_unlock(&ams_info.irq_lock); 68 } 69 70 static enum ams_irq ams_freefall_irq_data = AMS_IRQ_FREEFALL; 71 static struct pmf_irq_client ams_freefall_client = { 72 .owner = THIS_MODULE, 73 .handler = ams_handle_irq, 74 .data = &ams_freefall_irq_data, 75 }; 76 77 static enum ams_irq ams_shock_irq_data = AMS_IRQ_SHOCK; 78 static struct pmf_irq_client ams_shock_client = { 79 .owner = THIS_MODULE, 80 .handler = ams_handle_irq, 81 .data = &ams_shock_irq_data, 82 }; 83 84 /* Once hard disk parking is implemented in the kernel, this function can 85 * trigger it. 86 */ 87 static void ams_worker(struct work_struct *work) 88 { 89 unsigned long flags; 90 u8 irqs_to_clear; 91 92 mutex_lock(&ams_info.lock); 93 94 spin_lock_irqsave(&ams_info.irq_lock, flags); 95 irqs_to_clear = ams_info.worker_irqs; 96 97 if (ams_info.worker_irqs & AMS_IRQ_FREEFALL) { 98 if (verbose) 99 printk(KERN_INFO "ams: freefall detected!\n"); 100 101 ams_info.worker_irqs &= ~AMS_IRQ_FREEFALL; 102 } 103 104 if (ams_info.worker_irqs & AMS_IRQ_SHOCK) { 105 if (verbose) 106 printk(KERN_INFO "ams: shock detected!\n"); 107 108 ams_info.worker_irqs &= ~AMS_IRQ_SHOCK; 109 } 110 111 spin_unlock_irqrestore(&ams_info.irq_lock, flags); 112 113 ams_info.clear_irq(irqs_to_clear); 114 115 mutex_unlock(&ams_info.lock); 116 } 117 118 /* Call with ams_info.lock held! */ 119 int ams_sensor_attach(void) 120 { 121 int result; 122 const u32 *prop; 123 124 /* Get orientation */ 125 prop = of_get_property(ams_info.of_node, "orientation", NULL); 126 if (!prop) 127 return -ENODEV; 128 ams_info.orient1 = *prop; 129 ams_info.orient2 = *(prop + 1); 130 131 /* Register freefall interrupt handler */ 132 result = pmf_register_irq_client(ams_info.of_node, 133 "accel-int-1", 134 &ams_freefall_client); 135 if (result < 0) 136 return -ENODEV; 137 138 /* Reset saved irqs */ 139 ams_info.worker_irqs = 0; 140 141 /* Register shock interrupt handler */ 142 result = pmf_register_irq_client(ams_info.of_node, 143 "accel-int-2", 144 &ams_shock_client); 145 if (result < 0) 146 goto release_freefall; 147 148 /* Create device */ 149 ams_info.of_dev = of_platform_device_create(ams_info.of_node, "ams", NULL); 150 if (!ams_info.of_dev) { 151 result = -ENODEV; 152 goto release_shock; 153 } 154 155 /* Create attributes */ 156 result = device_create_file(&ams_info.of_dev->dev, &dev_attr_current); 157 if (result) 158 goto release_of; 159 160 ams_info.vflag = !!(ams_info.get_vendor() & 0x10); 161 162 /* Init input device */ 163 result = ams_input_init(); 164 if (result) 165 goto release_device_file; 166 167 return result; 168 release_device_file: 169 device_remove_file(&ams_info.of_dev->dev, &dev_attr_current); 170 release_of: 171 of_device_unregister(ams_info.of_dev); 172 release_shock: 173 pmf_unregister_irq_client(&ams_shock_client); 174 release_freefall: 175 pmf_unregister_irq_client(&ams_freefall_client); 176 return result; 177 } 178 179 int __init ams_init(void) 180 { 181 struct device_node *np; 182 183 spin_lock_init(&ams_info.irq_lock); 184 mutex_init(&ams_info.lock); 185 INIT_WORK(&ams_info.worker, ams_worker); 186 187 #ifdef CONFIG_SENSORS_AMS_I2C 188 np = of_find_node_by_name(NULL, "accelerometer"); 189 if (np && of_device_is_compatible(np, "AAPL,accelerometer_1")) 190 /* Found I2C motion sensor */ 191 return ams_i2c_init(np); 192 #endif 193 194 #ifdef CONFIG_SENSORS_AMS_PMU 195 np = of_find_node_by_name(NULL, "sms"); 196 if (np && of_device_is_compatible(np, "sms")) 197 /* Found PMU motion sensor */ 198 return ams_pmu_init(np); 199 #endif 200 return -ENODEV; 201 } 202 203 void ams_sensor_detach(void) 204 { 205 /* Remove input device */ 206 ams_input_exit(); 207 208 /* Remove attributes */ 209 device_remove_file(&ams_info.of_dev->dev, &dev_attr_current); 210 211 /* Flush interrupt worker 212 * 213 * We do this after ams_info.exit(), because an interrupt might 214 * have arrived before disabling them. 215 */ 216 flush_work(&ams_info.worker); 217 218 /* Remove device */ 219 of_device_unregister(ams_info.of_dev); 220 221 /* Remove handler */ 222 pmf_unregister_irq_client(&ams_shock_client); 223 pmf_unregister_irq_client(&ams_freefall_client); 224 } 225 226 static void __exit ams_exit(void) 227 { 228 /* Shut down implementation */ 229 ams_info.exit(); 230 } 231 232 MODULE_AUTHOR("Stelian Pop, Michael Hanselmann"); 233 MODULE_DESCRIPTION("Apple Motion Sensor driver"); 234 MODULE_LICENSE("GPL"); 235 236 module_init(ams_init); 237 module_exit(ams_exit); 238