1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * drivers/hwmon/lis3lv02d_i2c.c 4 * 5 * Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer. 6 * Driver is based on corresponding SPI driver written by Daniel Mack 7 * (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ). 8 * 9 * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). 10 * 11 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com> 12 */ 13 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/err.h> 17 #include <linux/i2c.h> 18 #include <linux/pm_runtime.h> 19 #include <linux/delay.h> 20 #include <linux/of.h> 21 #include <linux/of_platform.h> 22 #include <linux/of_device.h> 23 24 #include "lis3lv02d.h" 25 26 #define DRV_NAME "lis3lv02d_i2c" 27 28 static const char reg_vdd[] = "Vdd"; 29 static const char reg_vdd_io[] = "Vdd_IO"; 30 31 static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state) 32 { 33 int ret; 34 if (state == LIS3_REG_OFF) { 35 ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators), 36 lis3->regulators); 37 } else { 38 ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators), 39 lis3->regulators); 40 /* Chip needs time to wakeup. Not mentioned in datasheet */ 41 usleep_range(10000, 20000); 42 } 43 return ret; 44 } 45 46 static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value) 47 { 48 struct i2c_client *c = lis3->bus_priv; 49 return i2c_smbus_write_byte_data(c, reg, value); 50 } 51 52 static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v) 53 { 54 struct i2c_client *c = lis3->bus_priv; 55 *v = i2c_smbus_read_byte_data(c, reg); 56 return 0; 57 } 58 59 static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len, 60 u8 *v) 61 { 62 struct i2c_client *c = lis3->bus_priv; 63 reg |= (1 << 7); /* 7th bit enables address auto incrementation */ 64 return i2c_smbus_read_i2c_block_data(c, reg, len, v); 65 } 66 67 static int lis3_i2c_init(struct lis3lv02d *lis3) 68 { 69 u8 reg; 70 int ret; 71 72 lis3_reg_ctrl(lis3, LIS3_REG_ON); 73 74 lis3->read(lis3, WHO_AM_I, ®); 75 if (reg != lis3->whoami) 76 printk(KERN_ERR "lis3: power on failure\n"); 77 78 /* power up the device */ 79 ret = lis3->read(lis3, CTRL_REG1, ®); 80 if (ret < 0) 81 return ret; 82 83 if (lis3->whoami == WAI_3DLH) 84 reg |= CTRL1_PM0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen; 85 else 86 reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen; 87 88 return lis3->write(lis3, CTRL_REG1, reg); 89 } 90 91 /* Default axis mapping but it can be overwritten by platform data */ 92 static union axis_conversion lis3lv02d_axis_map = 93 { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } }; 94 95 #ifdef CONFIG_OF 96 static const struct of_device_id lis3lv02d_i2c_dt_ids[] = { 97 { .compatible = "st,lis3lv02d" }, 98 {} 99 }; 100 MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids); 101 #endif 102 103 static int lis3lv02d_i2c_probe(struct i2c_client *client, 104 const struct i2c_device_id *id) 105 { 106 int ret = 0; 107 struct lis3lv02d_platform_data *pdata = client->dev.platform_data; 108 109 #ifdef CONFIG_OF 110 if (of_match_device(lis3lv02d_i2c_dt_ids, &client->dev)) { 111 lis3_dev.of_node = client->dev.of_node; 112 ret = lis3lv02d_init_dt(&lis3_dev); 113 if (ret) 114 return ret; 115 pdata = lis3_dev.pdata; 116 } 117 #endif 118 119 if (pdata) { 120 if ((pdata->driver_features & LIS3_USE_BLOCK_READ) && 121 (i2c_check_functionality(client->adapter, 122 I2C_FUNC_SMBUS_I2C_BLOCK))) 123 lis3_dev.blkread = lis3_i2c_blockread; 124 125 if (pdata->axis_x) 126 lis3lv02d_axis_map.x = pdata->axis_x; 127 128 if (pdata->axis_y) 129 lis3lv02d_axis_map.y = pdata->axis_y; 130 131 if (pdata->axis_z) 132 lis3lv02d_axis_map.z = pdata->axis_z; 133 134 if (pdata->setup_resources) 135 ret = pdata->setup_resources(); 136 137 if (ret) 138 goto fail; 139 } 140 141 lis3_dev.regulators[0].supply = reg_vdd; 142 lis3_dev.regulators[1].supply = reg_vdd_io; 143 ret = regulator_bulk_get(&client->dev, 144 ARRAY_SIZE(lis3_dev.regulators), 145 lis3_dev.regulators); 146 if (ret < 0) 147 goto fail; 148 149 lis3_dev.pdata = pdata; 150 lis3_dev.bus_priv = client; 151 lis3_dev.init = lis3_i2c_init; 152 lis3_dev.read = lis3_i2c_read; 153 lis3_dev.write = lis3_i2c_write; 154 lis3_dev.irq = client->irq; 155 lis3_dev.ac = lis3lv02d_axis_map; 156 lis3_dev.pm_dev = &client->dev; 157 158 i2c_set_clientdata(client, &lis3_dev); 159 160 /* Provide power over the init call */ 161 lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON); 162 163 ret = lis3lv02d_init_device(&lis3_dev); 164 165 lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF); 166 167 if (ret) 168 goto fail2; 169 return 0; 170 171 fail2: 172 regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators), 173 lis3_dev.regulators); 174 fail: 175 if (pdata && pdata->release_resources) 176 pdata->release_resources(); 177 return ret; 178 } 179 180 static int lis3lv02d_i2c_remove(struct i2c_client *client) 181 { 182 struct lis3lv02d *lis3 = i2c_get_clientdata(client); 183 struct lis3lv02d_platform_data *pdata = client->dev.platform_data; 184 185 if (pdata && pdata->release_resources) 186 pdata->release_resources(); 187 188 lis3lv02d_joystick_disable(lis3); 189 lis3lv02d_remove_fs(&lis3_dev); 190 191 regulator_bulk_free(ARRAY_SIZE(lis3->regulators), 192 lis3_dev.regulators); 193 return 0; 194 } 195 196 #ifdef CONFIG_PM_SLEEP 197 static int lis3lv02d_i2c_suspend(struct device *dev) 198 { 199 struct i2c_client *client = to_i2c_client(dev); 200 struct lis3lv02d *lis3 = i2c_get_clientdata(client); 201 202 if (!lis3->pdata || !lis3->pdata->wakeup_flags) 203 lis3lv02d_poweroff(lis3); 204 return 0; 205 } 206 207 static int lis3lv02d_i2c_resume(struct device *dev) 208 { 209 struct i2c_client *client = to_i2c_client(dev); 210 struct lis3lv02d *lis3 = i2c_get_clientdata(client); 211 212 /* 213 * pm_runtime documentation says that devices should always 214 * be powered on at resume. Pm_runtime turns them off after system 215 * wide resume is complete. 216 */ 217 if (!lis3->pdata || !lis3->pdata->wakeup_flags || 218 pm_runtime_suspended(dev)) 219 lis3lv02d_poweron(lis3); 220 221 return 0; 222 } 223 #endif /* CONFIG_PM_SLEEP */ 224 225 #ifdef CONFIG_PM 226 static int lis3_i2c_runtime_suspend(struct device *dev) 227 { 228 struct i2c_client *client = to_i2c_client(dev); 229 struct lis3lv02d *lis3 = i2c_get_clientdata(client); 230 231 lis3lv02d_poweroff(lis3); 232 return 0; 233 } 234 235 static int lis3_i2c_runtime_resume(struct device *dev) 236 { 237 struct i2c_client *client = to_i2c_client(dev); 238 struct lis3lv02d *lis3 = i2c_get_clientdata(client); 239 240 lis3lv02d_poweron(lis3); 241 return 0; 242 } 243 #endif /* CONFIG_PM */ 244 245 static const struct i2c_device_id lis3lv02d_id[] = { 246 {"lis3lv02d", LIS3LV02D}, 247 {"lis331dlh", LIS331DLH}, 248 {} 249 }; 250 251 MODULE_DEVICE_TABLE(i2c, lis3lv02d_id); 252 253 static const struct dev_pm_ops lis3_pm_ops = { 254 SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend, 255 lis3lv02d_i2c_resume) 256 SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend, 257 lis3_i2c_runtime_resume, 258 NULL) 259 }; 260 261 static struct i2c_driver lis3lv02d_i2c_driver = { 262 .driver = { 263 .name = DRV_NAME, 264 .pm = &lis3_pm_ops, 265 .of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids), 266 }, 267 .probe = lis3lv02d_i2c_probe, 268 .remove = lis3lv02d_i2c_remove, 269 .id_table = lis3lv02d_id, 270 }; 271 272 module_i2c_driver(lis3lv02d_i2c_driver); 273 274 MODULE_AUTHOR("Nokia Corporation"); 275 MODULE_DESCRIPTION("lis3lv02d I2C interface"); 276 MODULE_LICENSE("GPL"); 277