diff options
Diffstat (limited to 'drivers/net/wireless/digiPiper/adc121c027.c')
| -rw-r--r-- | drivers/net/wireless/digiPiper/adc121c027.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/drivers/net/wireless/digiPiper/adc121c027.c b/drivers/net/wireless/digiPiper/adc121c027.c new file mode 100644 index 000000000000..17564bcd7a66 --- /dev/null +++ b/drivers/net/wireless/digiPiper/adc121c027.c @@ -0,0 +1,161 @@ +/* + adc121C027.c - Analog to Digital converter integrated into Piper. + + Copyright (C) 2009 Digi International <sales2@digi.com> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2 of the License. +*/ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include <linux/hwmon-sysfs.h> + +#include "airohaCalibration.h" +#include "pipermain.h" + +/* Addresses to scan: none, device is not autodetected */ +/* static const unsigned short normal_i2c[] = { I2C_CLIENT_END }; */ + +#define ADC_I2C_ADDR (0x51) +#define ADC_CYCLE_TIME (0x20) + +static const unsigned short normal_i2c[] = { ADC_I2C_ADDR, I2C_CLIENT_END }; +static const unsigned short dummy_i2c_addrlist[] = { I2C_CLIENT_END }; + +static struct i2c_client_address_data addr = { + .normal_i2c = normal_i2c, + .probe = dummy_i2c_addrlist, + .ignore = dummy_i2c_addrlist, +}; + +enum adc121C027_cmd { + ADC_RESULT = 0, + ADC_ALERT_STATUS = 1, + ADC_CONFIGURATION = 2, + ADC_LOW_LIMIT = 3, + ADC_HIGH_LIMIT = 4, + ADC_HYSTERESIS = 5, + ADC_LOWEST_VALUE = 6, + ADC_HIGHEST_VALUE = 7, +}; + +static u16 adc121C027_read_peak(struct airohaCalibrationData *cal) +{ + struct i2c_client *i2cclient = (struct i2c_client *)cal->priv; + + return be16_to_cpu(i2c_smbus_read_word_data(i2cclient, ADC_HIGHEST_VALUE)); +} + +static void adc121C027_clear_peak(struct airohaCalibrationData *cal) +{ + struct i2c_client *i2cclient = (struct i2c_client *)cal->priv; + + i2c_smbus_write_word_data(i2cclient, ADC_HIGHEST_VALUE, 0); +} + +static u16 adc121C027_read_last_sample(struct airohaCalibrationData *cal) +{ + struct i2c_client *i2cclient = (struct i2c_client *)cal->priv; + + return be16_to_cpu(i2c_smbus_read_word_data(i2cclient, ADC_RESULT)); +} + +static int adc121C027_probe(struct i2c_client *client, const struct i2c_device_id *id) +{ + return (client->addr != ADC_I2C_ADDR) ? -EINVAL : 0; +} + +static int adc121C027_remove(struct i2c_client *client) +{ + /* Real shut down will be done by adc121C027_shutdown() */ + return 0; +} + +static const struct i2c_device_id adc121C027_id[] = { + { "adc121C027", 0 }, + {} +}; + +static struct i2c_driver adc121C027_driver = { + .driver = { + .name = "adc121C027", + }, + .probe = adc121C027_probe, + .remove = __devexit_p(adc121C027_remove), + .id_table = adc121C027_id, + .address_data = &addr, +}; + +/* Turn on automatic A/D process by setting a non zero cycle time */ +static void adc121C027_hw_init(struct airohaCalibrationData *cal) +{ + struct i2c_client *i2cclient = (struct i2c_client *)cal->priv; + + i2c_smbus_write_word_data(i2cclient, ADC_CONFIGURATION, ADC_CYCLE_TIME); +} + +void adc121C027_shutdown(struct airohaCalibrationData *cal) +{ + struct i2c_client *i2cclient = (struct i2c_client *)cal->priv; + + if (i2cclient) { + i2c_unregister_device(i2cclient); + cal->priv = NULL; + } + i2c_del_driver(&adc121C027_driver); +} + +int adc121C027_init(struct airohaCalibrationData *cal, int i2cadapter) +{ + struct i2c_board_info board_info = { + .type = "adc121C027", + .addr = ADC_I2C_ADDR, + }; + struct i2c_adapter *adapter; + struct i2c_client *adc_i2c_client; + int ret; + + ret = i2c_add_driver(&adc121C027_driver); + if (ret) { + printk(KERN_WARNING PIPER_DRIVER_NAME + ": error adding driver adc121C027_driver (%d)\n", ret); + return ret; + } + + adapter = i2c_get_adapter(i2cadapter); + if (!adapter) { + printk(KERN_WARNING PIPER_DRIVER_NAME + ": error getting i2c adapter\n"); + return -EINVAL; + } + + adc_i2c_client = i2c_new_device(adapter, &board_info); + if (!adc_i2c_client) { + printk(KERN_WARNING PIPER_DRIVER_NAME + ": error creating new i2c client\n"); + return -EINVAL; + } + + cal->priv = (void *)adc_i2c_client; + adc121C027_hw_init(cal); + + cal->cops = kmalloc(sizeof(struct calibration_ops), GFP_KERNEL); + if (!cal->cops) { + printk(KERN_WARNING PIPER_DRIVER_NAME + ": unable to allocate memory for cal->cops\n"); + return -ENOMEM; + } + cal->cops->adc_read_peak = adc121C027_read_peak; + cal->cops->adc_clear_peak = adc121C027_clear_peak; + cal->cops->adc_read_last_val = adc121C027_read_last_sample; + cal->cops->adc_shutdown = adc121C027_shutdown; + + return 0; +} +EXPORT_SYMBOL_GPL(adc121C027_init); + + |