// SPDX-License-Identifier: GPL-2.0-only /* * drivers/hwmon/lis3lv02d_i2c.c * * Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer. * Driver is based on corresponding SPI driver written by Daniel Mack * (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ). * * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). * * Contact: Samu Onkalo <samu.p.onkalo@nokia.com> */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/err.h> #include <linux/i2c.h> #include <linux/pm_runtime.h> #include <linux/delay.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/of_device.h> #include "lis3lv02d.h" #define DRV_NAME "lis3lv02d_i2c" static const char reg_vdd[] = "Vdd"; static const char reg_vdd_io[] = "Vdd_IO"; static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state) { int ret; if (state == LIS3_REG_OFF) { ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators), lis3->regulators); } else { ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators), lis3->regulators); /* Chip needs time to wakeup. Not mentioned in datasheet */ usleep_range(10000, 20000); } return ret; } static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value) { struct i2c_client *c = lis3->bus_priv; return i2c_smbus_write_byte_data(c, reg, value); } static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v) { struct i2c_client *c = lis3->bus_priv; *v = i2c_smbus_read_byte_data(c, reg); return 0; } static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len, u8 *v) { struct i2c_client *c = lis3->bus_priv; reg |= (1 << 7); /* 7th bit enables address auto incrementation */ return i2c_smbus_read_i2c_block_data(c, reg, len, v); } static int lis3_i2c_init(struct lis3lv02d *lis3) { u8 reg; int ret; lis3_reg_ctrl(lis3, LIS3_REG_ON); lis3->read(lis3, WHO_AM_I, ®); if (reg != lis3->whoami) printk(KERN_ERR "lis3: power on failure\n"); /* power up the device */ ret = lis3->read(lis3, CTRL_REG1, ®); if (ret < 0) return ret; if (lis3->whoami == WAI_3DLH) reg |= CTRL1_PM0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen; else reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen; return lis3->write(lis3, CTRL_REG1, reg); } /* Default axis mapping but it can be overwritten by platform data */ static union axis_conversion lis3lv02d_axis_map = { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } }; #ifdef CONFIG_OF static const struct of_device_id lis3lv02d_i2c_dt_ids[] = { { .compatible = "st,lis3lv02d" }, {} }; MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids); #endif static int lis3lv02d_i2c_probe(struct i2c_client *client) { int ret = 0; struct lis3lv02d_platform_data *pdata = client->dev.platform_data; #ifdef CONFIG_OF if (of_match_device(lis3lv02d_i2c_dt_ids, &client->dev)) { lis3_dev.of_node = client->dev.of_node; ret = lis3lv02d_init_dt(&lis3_dev); if (ret) return ret; pdata = lis3_dev.pdata; } #endif if (pdata) { if ((pdata->driver_features & LIS3_USE_BLOCK_READ) && (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))) lis3_dev.blkread = lis3_i2c_blockread; if (pdata->axis_x) lis3lv02d_axis_map.x = pdata->axis_x; if (pdata->axis_y) lis3lv02d_axis_map.y = pdata->axis_y; if (pdata->axis_z) lis3lv02d_axis_map.z = pdata->axis_z; if (pdata->setup_resources) ret = pdata->setup_resources(); if (ret) goto fail; } lis3_dev.regulators[0].supply = reg_vdd; lis3_dev.regulators[1].supply = reg_vdd_io; ret = regulator_bulk_get(&client->dev, ARRAY_SIZE(lis3_dev.regulators), lis3_dev.regulators); if (ret < 0) goto fail; lis3_dev.pdata = pdata; lis3_dev.bus_priv = client; lis3_dev.init = lis3_i2c_init; lis3_dev.read = lis3_i2c_read; lis3_dev.write = lis3_i2c_write; lis3_dev.reg_ctrl = lis3_reg_ctrl; lis3_dev.irq = client->irq; lis3_dev.ac = lis3lv02d_axis_map; lis3_dev.pm_dev = &client->dev; i2c_set_clientdata(client, &lis3_dev); /* Provide power over the init call */ lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON); ret = lis3lv02d_init_device(&lis3_dev); lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF); if (ret) goto fail2; return 0; fail2: regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators), lis3_dev.regulators); fail: if (pdata && pdata->release_resources) pdata->release_resources(); return ret; } static void lis3lv02d_i2c_remove(struct i2c_client *client) { struct lis3lv02d *lis3 = i2c_get_clientdata(client); struct lis3lv02d_platform_data *pdata = client->dev.platform_data; if (pdata && pdata->release_resources) pdata->release_resources(); lis3lv02d_joystick_disable(lis3); lis3lv02d_remove_fs(&lis3_dev); regulator_bulk_free(ARRAY_SIZE(lis3->regulators), lis3_dev.regulators); } #ifdef CONFIG_PM_SLEEP static int lis3lv02d_i2c_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct lis3lv02d *lis3 = i2c_get_clientdata(client); /* Turn on for wakeup if turned off by runtime suspend */ if (lis3->pdata && lis3->pdata->wakeup_flags) { if (pm_runtime_suspended(dev)) lis3lv02d_poweron(lis3); /* For non wakeup turn off if not already turned off by runtime suspend */ } else if (!pm_runtime_suspended(dev)) lis3lv02d_poweroff(lis3); return 0; } static int lis3lv02d_i2c_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct lis3lv02d *lis3 = i2c_get_clientdata(client); /* Turn back off if turned on for wakeup and runtime suspended*/ if (lis3->pdata && lis3->pdata->wakeup_flags) { if (pm_runtime_suspended(dev)) lis3lv02d_poweroff(lis3); /* For non wakeup turn back on if not runtime suspended */ } else if (!pm_runtime_suspended(dev)) lis3lv02d_poweron(lis3); return 0; } #endif /* CONFIG_PM_SLEEP */ #ifdef CONFIG_PM static int lis3_i2c_runtime_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct lis3lv02d *lis3 = i2c_get_clientdata(client); lis3lv02d_poweroff(lis3); return 0; } static int lis3_i2c_runtime_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct lis3lv02d *lis3 = i2c_get_clientdata(client); lis3lv02d_poweron(lis3); return 0; } #endif /* CONFIG_PM */ static const struct i2c_device_id lis3lv02d_id[] = { {"lis3lv02d", LIS3LV02D}, {"lis331dlh", LIS331DLH}, {} }; MODULE_DEVICE_TABLE(i2c, lis3lv02d_id); static const struct dev_pm_ops lis3_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend, lis3lv02d_i2c_resume) SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend, lis3_i2c_runtime_resume, NULL) }; static struct i2c_driver lis3lv02d_i2c_driver = { .driver = { .name = DRV_NAME, .pm = &lis3_pm_ops, .of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids), }, .probe = lis3lv02d_i2c_probe, .remove = lis3lv02d_i2c_remove, .id_table = lis3lv02d_id, }; module_i2c_driver(lis3lv02d_i2c_driver); MODULE_AUTHOR("Nokia Corporation"); MODULE_DESCRIPTION("lis3lv02d I2C interface"); MODULE_LICENSE("GPL");