diff options
Diffstat (limited to 'drivers/misc/lis3lv02d/lis3lv02d_i2c.c')
| -rw-r--r-- | drivers/misc/lis3lv02d/lis3lv02d_i2c.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/drivers/misc/lis3lv02d/lis3lv02d_i2c.c b/drivers/misc/lis3lv02d/lis3lv02d_i2c.c new file mode 100644 index 000000000..52555d2e8 --- /dev/null +++ b/drivers/misc/lis3lv02d/lis3lv02d_i2c.c @@ -0,0 +1,276 @@ +// 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, + const struct i2c_device_id *id) +{ + 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.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 int 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); + return 0; +} + +#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); + + if (!lis3->pdata || !lis3->pdata->wakeup_flags) + 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); + + /* + * pm_runtime documentation says that devices should always + * be powered on at resume. Pm_runtime turns them off after system + * wide resume is complete. + */ + if (!lis3->pdata || !lis3->pdata->wakeup_flags || + 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"); |