281 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * drivers/hwmon/lis3lv02d_i2c.c4 *5 * Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer.6 * Driver is based on corresponding SPI driver written by Daniel Mack7 * (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 28static const char reg_vdd[] = "Vdd";29static const char reg_vdd_io[] = "Vdd_IO";30 31static 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 46static 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 52static 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 59static 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 67static 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 else86 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 */92static union axis_conversion lis3lv02d_axis_map =93 { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };94 95#ifdef CONFIG_OF96static const struct of_device_id lis3lv02d_i2c_dt_ids[] = {97 { .compatible = "st,lis3lv02d" },98 {}99};100MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids);101#endif102 103static int lis3lv02d_i2c_probe(struct i2c_client *client)104{105 int ret = 0;106 struct lis3lv02d_platform_data *pdata = client->dev.platform_data;107 108#ifdef CONFIG_OF109 if (of_match_device(lis3lv02d_i2c_dt_ids, &client->dev)) {110 lis3_dev.of_node = client->dev.of_node;111 ret = lis3lv02d_init_dt(&lis3_dev);112 if (ret)113 return ret;114 pdata = lis3_dev.pdata;115 }116#endif117 118 if (pdata) {119 if ((pdata->driver_features & LIS3_USE_BLOCK_READ) &&120 (i2c_check_functionality(client->adapter,121 I2C_FUNC_SMBUS_I2C_BLOCK)))122 lis3_dev.blkread = lis3_i2c_blockread;123 124 if (pdata->axis_x)125 lis3lv02d_axis_map.x = pdata->axis_x;126 127 if (pdata->axis_y)128 lis3lv02d_axis_map.y = pdata->axis_y;129 130 if (pdata->axis_z)131 lis3lv02d_axis_map.z = pdata->axis_z;132 133 if (pdata->setup_resources)134 ret = pdata->setup_resources();135 136 if (ret)137 goto fail;138 }139 140 lis3_dev.regulators[0].supply = reg_vdd;141 lis3_dev.regulators[1].supply = reg_vdd_io;142 ret = regulator_bulk_get(&client->dev,143 ARRAY_SIZE(lis3_dev.regulators),144 lis3_dev.regulators);145 if (ret < 0)146 goto fail;147 148 lis3_dev.pdata = pdata;149 lis3_dev.bus_priv = client;150 lis3_dev.init = lis3_i2c_init;151 lis3_dev.read = lis3_i2c_read;152 lis3_dev.write = lis3_i2c_write;153 lis3_dev.reg_ctrl = lis3_reg_ctrl;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 171fail2:172 regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators),173 lis3_dev.regulators);174fail:175 if (pdata && pdata->release_resources)176 pdata->release_resources();177 return ret;178}179 180static void 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}194 195#ifdef CONFIG_PM_SLEEP196static int lis3lv02d_i2c_suspend(struct device *dev)197{198 struct i2c_client *client = to_i2c_client(dev);199 struct lis3lv02d *lis3 = i2c_get_clientdata(client);200 201 /* Turn on for wakeup if turned off by runtime suspend */202 if (lis3->pdata && lis3->pdata->wakeup_flags) {203 if (pm_runtime_suspended(dev))204 lis3lv02d_poweron(lis3);205 /* For non wakeup turn off if not already turned off by runtime suspend */206 } else if (!pm_runtime_suspended(dev))207 lis3lv02d_poweroff(lis3);208 209 return 0;210}211 212static int lis3lv02d_i2c_resume(struct device *dev)213{214 struct i2c_client *client = to_i2c_client(dev);215 struct lis3lv02d *lis3 = i2c_get_clientdata(client);216 217 /* Turn back off if turned on for wakeup and runtime suspended*/218 if (lis3->pdata && lis3->pdata->wakeup_flags) {219 if (pm_runtime_suspended(dev))220 lis3lv02d_poweroff(lis3);221 /* For non wakeup turn back on if not runtime suspended */222 } else if (!pm_runtime_suspended(dev))223 lis3lv02d_poweron(lis3);224 225 return 0;226}227#endif /* CONFIG_PM_SLEEP */228 229#ifdef CONFIG_PM230static int lis3_i2c_runtime_suspend(struct device *dev)231{232 struct i2c_client *client = to_i2c_client(dev);233 struct lis3lv02d *lis3 = i2c_get_clientdata(client);234 235 lis3lv02d_poweroff(lis3);236 return 0;237}238 239static int lis3_i2c_runtime_resume(struct device *dev)240{241 struct i2c_client *client = to_i2c_client(dev);242 struct lis3lv02d *lis3 = i2c_get_clientdata(client);243 244 lis3lv02d_poweron(lis3);245 return 0;246}247#endif /* CONFIG_PM */248 249static const struct i2c_device_id lis3lv02d_id[] = {250 {"lis3lv02d", LIS3LV02D},251 {"lis331dlh", LIS331DLH},252 {}253};254 255MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);256 257static const struct dev_pm_ops lis3_pm_ops = {258 SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,259 lis3lv02d_i2c_resume)260 SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,261 lis3_i2c_runtime_resume,262 NULL)263};264 265static struct i2c_driver lis3lv02d_i2c_driver = {266 .driver = {267 .name = DRV_NAME,268 .pm = &lis3_pm_ops,269 .of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids),270 },271 .probe = lis3lv02d_i2c_probe,272 .remove = lis3lv02d_i2c_remove,273 .id_table = lis3lv02d_id,274};275 276module_i2c_driver(lis3lv02d_i2c_driver);277 278MODULE_AUTHOR("Nokia Corporation");279MODULE_DESCRIPTION("lis3lv02d I2C interface");280MODULE_LICENSE("GPL");281