diff options
Diffstat (limited to 'drivers/staging/iio/adc/max1363_core.c')
-rw-r--r-- | drivers/staging/iio/adc/max1363_core.c | 623 |
1 files changed, 623 insertions, 0 deletions
diff --git a/drivers/staging/iio/adc/max1363_core.c b/drivers/staging/iio/adc/max1363_core.c new file mode 100644 index 00000000000..9703881cb3f --- /dev/null +++ b/drivers/staging/iio/adc/max1363_core.c @@ -0,0 +1,623 @@ + /* + * linux/drivers/industrialio/adc/max1363.c + * Copyright (C) 2008 Jonathan Cameron + * + * based on linux/drivers/i2c/chips/max123x + * Copyright (C) 2002-2004 Stefan Eletzhofer + * + * based on linux/drivers/acron/char/pcf8583.c + * Copyright (C) 2000 Russell King + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * max1363.c + * + * Partial support for max1363 and similar chips. + * + * Not currently implemented. + * + * - Monitor interrrupt generation. + * - Control of internal reference. + * - Sysfs scan interface currently assumes unipolar mode. + */ + +#include <linux/interrupt.h> +#include <linux/gpio.h> +#include <linux/workqueue.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/sysfs.h> +#include <linux/list.h> +#include <linux/i2c.h> +#include <linux/rtc.h> +#include <linux/regulator/consumer.h> + +#include "../iio.h" +#include "../sysfs.h" + +#include "max1363.h" + +/* Available scan modes. + * Awkwardly the associated enum is in the header so it is available to + * the ring buffer code. + */ +static const struct max1363_mode max1363_mode_table[] = { + MAX1363_MODE_SINGLE(0), + MAX1363_MODE_SINGLE(1), + MAX1363_MODE_SINGLE(2), + MAX1363_MODE_SINGLE(3), + MAX1363_MODE_SINGLE(4), + MAX1363_MODE_SINGLE(5), + MAX1363_MODE_SINGLE(6), + MAX1363_MODE_SINGLE(7), + MAX1363_MODE_SINGLE(8), + MAX1363_MODE_SINGLE(9), + MAX1363_MODE_SINGLE(10), + MAX1363_MODE_SINGLE(11), + + MAX1363_MODE_SINGLE_TIMES_8(0), + MAX1363_MODE_SINGLE_TIMES_8(1), + MAX1363_MODE_SINGLE_TIMES_8(2), + MAX1363_MODE_SINGLE_TIMES_8(3), + MAX1363_MODE_SINGLE_TIMES_8(4), + MAX1363_MODE_SINGLE_TIMES_8(5), + MAX1363_MODE_SINGLE_TIMES_8(6), + MAX1363_MODE_SINGLE_TIMES_8(7), + MAX1363_MODE_SINGLE_TIMES_8(8), + MAX1363_MODE_SINGLE_TIMES_8(9), + MAX1363_MODE_SINGLE_TIMES_8(10), + MAX1363_MODE_SINGLE_TIMES_8(11), + + MAX1363_MODE_SCAN_TO_CHANNEL(1), + MAX1363_MODE_SCAN_TO_CHANNEL(2), + MAX1363_MODE_SCAN_TO_CHANNEL(3), + MAX1363_MODE_SCAN_TO_CHANNEL(4), + MAX1363_MODE_SCAN_TO_CHANNEL(5), + MAX1363_MODE_SCAN_TO_CHANNEL(6), + MAX1363_MODE_SCAN_TO_CHANNEL(7), + MAX1363_MODE_SCAN_TO_CHANNEL(8), + MAX1363_MODE_SCAN_TO_CHANNEL(9), + MAX1363_MODE_SCAN_TO_CHANNEL(10), + MAX1363_MODE_SCAN_TO_CHANNEL(11), + + MAX1363_MODE_DIFF_SINGLE(0, 1), + MAX1363_MODE_DIFF_SINGLE(2, 3), + MAX1363_MODE_DIFF_SINGLE(4, 5), + MAX1363_MODE_DIFF_SINGLE(6, 7), + MAX1363_MODE_DIFF_SINGLE(8, 9), + MAX1363_MODE_DIFF_SINGLE(10, 11), + MAX1363_MODE_DIFF_SINGLE(1, 0), + MAX1363_MODE_DIFF_SINGLE(3, 2), + MAX1363_MODE_DIFF_SINGLE(5, 4), + MAX1363_MODE_DIFF_SINGLE(7, 6), + MAX1363_MODE_DIFF_SINGLE(9, 8), + MAX1363_MODE_DIFF_SINGLE(11, 10), + + MAX1363_MODE_DIFF_SINGLE_TIMES_8(0, 1), + MAX1363_MODE_DIFF_SINGLE_TIMES_8(2, 3), + MAX1363_MODE_DIFF_SINGLE_TIMES_8(4, 5), + MAX1363_MODE_DIFF_SINGLE_TIMES_8(6, 7), + MAX1363_MODE_DIFF_SINGLE_TIMES_8(8, 9), + MAX1363_MODE_DIFF_SINGLE_TIMES_8(10, 11), + MAX1363_MODE_DIFF_SINGLE_TIMES_8(1, 0), + MAX1363_MODE_DIFF_SINGLE_TIMES_8(3, 2), + MAX1363_MODE_DIFF_SINGLE_TIMES_8(5, 4), + MAX1363_MODE_DIFF_SINGLE_TIMES_8(7, 6), + MAX1363_MODE_DIFF_SINGLE_TIMES_8(9, 8), + MAX1363_MODE_DIFF_SINGLE_TIMES_8(11, 10), + + MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...2-3, 2, 2), + MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...4-5, 4, 3), + MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...6-7, 6, 4), + MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...8-9, 8, 5), + MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...10-11, 10, 6), + MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...3-2, 3, 2), + MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...5-4, 5, 3), + MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...7-6, 7, 4), + MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...9-8, 9, 5), + MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...11-10, 11, 6), + + MAX1236_MODE_SCAN_MID_TO_CHANNEL(2, 3), + MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 7), + MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 8), + MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 9), + MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 10), + MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 11), + + MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(6-7...8-9, 8, 2), + MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(6-7...10-11, 10, 3), + MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(7-6...9-8, 9, 2), + MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(7-6...11-10, 11, 3), +}; + +/* Applies to max1363 */ +static const enum max1363_modes max1363_mode_list[] = { + _s0, _s1, _s2, _s3, + se0, se1, se2, se3, + s0to1, s0to2, s0to3, + d0m1, d2m3, d1m0, d3m2, + de0m1, de2m3, de1m0, de3m2, + d0m1to2m3, d1m0to3m2, +}; + +/* Appies to max1236, max1237 */ +static const enum max1363_modes max1236_mode_list[] = { + _s0, _s1, _s2, _s3, + se0, se1, se2, se3, + s0to1, s0to2, s0to3, + d0m1, d2m3, d1m0, d3m2, + de0m1, de2m3, de1m0, de3m2, + d0m1to2m3, d1m0to3m2, + s2to3, +}; + +/* Applies to max1238, max1239 */ +static const enum max1363_modes max1238_mode_list[] = { + _s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7, _s8, _s9, _s10, _s11, + se0, se1, se2, se3, se4, se5, se6, se7, se8, se9, se10, se11, + s0to1, s0to2, s0to3, s0to4, s0to5, s0to6, + s0to7, s0to8, s0to9, s0to10, s0to11, + d0m1, d2m3, d4m5, d6m7, d8m9, d10m11, + d1m0, d3m2, d5m4, d7m6, d9m8, d11m10, + de0m1, de2m3, de4m5, de6m7, de8m9, de10m11, + de1m0, de3m2, de5m4, de7m6, de9m8, de11m10, + d0m1to2m3, d0m1to4m5, d0m1to6m7, d0m1to8m9, d0m1to10m11, + d1m0to3m2, d1m0to5m4, d1m0to7m6, d1m0to9m8, d1m0to11m10, + s6to7, s6to8, s6to9, s6to10, s6to11, + s6m7to8m9, s6m7to10m11, s7m6to9m8, s7m6to11m10, +}; + + +enum { max1361, + max1362, + max1363, + max1364, + max1136, + max1137, + max1138, + max1139, + max1236, + max1237, + max1238, + max1239, +}; + +/* max1363 and max1368 tested - rest from data sheet */ +static const struct max1363_chip_info max1363_chip_info_tbl[] = { + { + .name = "max1361", + .num_inputs = 4, + .monitor_mode = 1, + .mode_list = max1363_mode_list, + .num_modes = ARRAY_SIZE(max1363_mode_list), + .default_mode = s0to3, + }, { + .name = "max1362", + .num_inputs = 4, + .monitor_mode = 1, + .mode_list = max1363_mode_list, + .num_modes = ARRAY_SIZE(max1363_mode_list), + .default_mode = s0to3, + }, { + .name = "max1363", + .num_inputs = 4, + .monitor_mode = 1, + .mode_list = max1363_mode_list, + .num_modes = ARRAY_SIZE(max1363_mode_list), + .default_mode = s0to3, + }, { + .name = "max1364", + .num_inputs = 4, + .monitor_mode = 1, + .mode_list = max1363_mode_list, + .num_modes = ARRAY_SIZE(max1363_mode_list), + .default_mode = s0to3, + }, { + .name = "max1136", + .num_inputs = 4, + .int_vref_mv = 4096, + .mode_list = max1236_mode_list, + .num_modes = ARRAY_SIZE(max1236_mode_list), + .default_mode = s0to3, + }, { + .name = "max1137", + .num_inputs = 4, + .int_vref_mv = 2048, + .mode_list = max1236_mode_list, + .num_modes = ARRAY_SIZE(max1236_mode_list), + .default_mode = s0to3, + }, { + .name = "max1138", + .num_inputs = 12, + .int_vref_mv = 4096, + .mode_list = max1238_mode_list, + .num_modes = ARRAY_SIZE(max1238_mode_list), + .default_mode = s0to11, + }, { + .name = "max1139", + .num_inputs = 12, + .int_vref_mv = 2048, + .mode_list = max1238_mode_list, + .num_modes = ARRAY_SIZE(max1238_mode_list), + .default_mode = s0to11, + }, { + .name = "max1236", + .num_inputs = 4, + .int_vref_mv = 4096, + .mode_list = max1236_mode_list, + .num_modes = ARRAY_SIZE(max1236_mode_list), + .default_mode = s0to3, + }, { + .name = "max1237", + .num_inputs = 4, + .int_vref_mv = 2048, + .mode_list = max1236_mode_list, + .num_modes = ARRAY_SIZE(max1236_mode_list), + .default_mode = s0to3, + }, { + .name = "max1238", + .num_inputs = 12, + .int_vref_mv = 4096, + .mode_list = max1238_mode_list, + .num_modes = ARRAY_SIZE(max1238_mode_list), + .default_mode = s0to11, + }, { + .name = "max1239", + .num_inputs = 12, + .int_vref_mv = 2048, + .mode_list = max1238_mode_list, + .num_modes = ARRAY_SIZE(max1238_mode_list), + .default_mode = s0to11, + }, +}; + +static int max1363_write_basic_config(struct i2c_client *client, + unsigned char d1, + unsigned char d2) +{ + int ret; + u8 *tx_buf = kmalloc(2 , GFP_KERNEL); + if (!tx_buf) + return -ENOMEM; + tx_buf[0] = d1; + tx_buf[1] = d2; + + ret = i2c_master_send(client, tx_buf, 2); + kfree(tx_buf); + return (ret > 0) ? 0 : ret; +} + +static int max1363_set_scan_mode(struct max1363_state *st) +{ + st->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK + | MAX1363_SCAN_MASK + | MAX1363_SE_DE_MASK); + st->configbyte |= st->current_mode->conf; + + return max1363_write_basic_config(st->client, + st->setupbyte, + st->configbyte); +} + +static int max1363_initial_setup(struct max1363_state *st) +{ + st->setupbyte = MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_VDD + | MAX1363_SETUP_POWER_UP_INT_REF + | MAX1363_SETUP_INT_CLOCK + | MAX1363_SETUP_UNIPOLAR + | MAX1363_SETUP_NORESET; + + /* Set scan mode writes the config anyway so wait until then*/ + st->setupbyte = MAX1363_SETUP_BYTE(st->setupbyte); + st->current_mode = &max1363_mode_table[st->chip_info->default_mode]; + st->configbyte = MAX1363_CONFIG_BYTE(st->configbyte); + + return max1363_set_scan_mode(st); +} + +static ssize_t max1363_show_av_scan_modes(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct max1363_state *st = dev_info->dev_data; + int i, len = 0; + + for (i = 0; i < st->chip_info->num_modes; i++) + len += sprintf(buf + len, "%s ", + max1363_mode_table[st->chip_info + ->mode_list[i]].name); + len += sprintf(buf + len, "\n"); + + return len; +} + + +/* The dev here is the sysfs related one, not the underlying i2c one */ +static ssize_t max1363_scan_direct(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct max1363_state *st = dev_info->dev_data; + int len = 0, ret, i; + struct i2c_client *client = st->client; + char *rxbuf; + + if (st->current_mode->numvals == 0) + return 0; + rxbuf = kmalloc(st->current_mode->numvals*2, GFP_KERNEL); + if (rxbuf == NULL) + return -ENOMEM; + + /* Interpretation depends on whether these are signed or not!*/ + /* Assume not for now */ + ret = i2c_master_recv(client, rxbuf, st->current_mode->numvals*2); + + if (ret < 0) + return ret; + for (i = 0; i < st->current_mode->numvals; i++) + len += sprintf(buf+len, "%d ", + ((int)(rxbuf[i*2+0]&0x0F) << 8) + + ((int)(rxbuf[i*2+1]))); + kfree(rxbuf); + len += sprintf(buf + len, "\n"); + + return len; +} + +static ssize_t max1363_scan(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + int ret; + + mutex_lock(&dev_info->mlock); + if (dev_info->currentmode == INDIO_RING_TRIGGERED) + ret = max1363_scan_from_ring(dev, attr, buf); + else + ret = max1363_scan_direct(dev, attr, buf); + mutex_unlock(&dev_info->mlock); + + return ret; +} + +/* Cannot query the device, so use local copy of state */ +static ssize_t max1363_show_scan_mode(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct max1363_state *st = dev_info->dev_data; + + return sprintf(buf, "%s\n", st->current_mode->name); +} + +static const struct max1363_mode +*__max1363_find_mode_in_ci(const struct max1363_chip_info *info, + const char *buf) +{ + int i; + for (i = 0; i < info->num_modes; i++) + if (strcmp(max1363_mode_table[info->mode_list[i]].name, buf) + == 0) + return &max1363_mode_table[info->mode_list[i]]; + return NULL; +} + +static ssize_t max1363_store_scan_mode(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct max1363_state *st = dev_info->dev_data; + const struct max1363_mode *new_mode; + int ret; + + mutex_lock(&dev_info->mlock); + new_mode = NULL; + /* Avoid state changes if a ring buffer is enabled */ + if (!iio_ring_enabled(dev_info)) { + new_mode + = __max1363_find_mode_in_ci(st->chip_info, buf); + if (!new_mode) { + ret = -EINVAL; + goto error_ret; + } + st->current_mode = new_mode; + ret = max1363_set_scan_mode(st); + if (ret) + goto error_ret; + } else { + ret = -EBUSY; + goto error_ret; + } + mutex_unlock(&dev_info->mlock); + + return len; + +error_ret: + mutex_unlock(&dev_info->mlock); + + return ret; +} + +IIO_DEV_ATTR_AVAIL_SCAN_MODES(max1363_show_av_scan_modes); +IIO_DEV_ATTR_SCAN_MODE(S_IRUGO | S_IWUSR, + max1363_show_scan_mode, + max1363_store_scan_mode); + +IIO_DEV_ATTR_SCAN(max1363_scan); + +static ssize_t max1363_show_name(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct max1363_state *st = dev_info->dev_data; + return sprintf(buf, "%s\n", st->chip_info->name); +} + +IIO_DEVICE_ATTR(name, S_IRUGO, max1363_show_name, NULL, 0); + +/*name export */ + +static struct attribute *max1363_attributes[] = { + &iio_dev_attr_available_scan_modes.dev_attr.attr, + &iio_dev_attr_scan_mode.dev_attr.attr, + &iio_dev_attr_scan.dev_attr.attr, + &iio_dev_attr_name.dev_attr.attr, + NULL, +}; + +static const struct attribute_group max1363_attribute_group = { + .attrs = max1363_attributes, +}; + +static int __devinit max1363_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret, i, regdone = 0; + struct max1363_state *st = kzalloc(sizeof(*st), GFP_KERNEL); + if (st == NULL) { + ret = -ENOMEM; + goto error_ret; + } + + /* this is only used for device removal purposes */ + i2c_set_clientdata(client, st); + + atomic_set(&st->protect_ring, 0); + + /* Find the chip model specific data */ + for (i = 0; i < ARRAY_SIZE(max1363_chip_info_tbl); i++) + if (!strcmp(max1363_chip_info_tbl[i].name, id->name)) { + st->chip_info = &max1363_chip_info_tbl[i]; + break; + }; + /* Unsupported chip */ + if (!st->chip_info) { + dev_err(&client->dev, "%s is not supported\n", id->name); + ret = -ENODEV; + goto error_free_st; + } + st->reg = regulator_get(&client->dev, "vcc"); + if (!IS_ERR(st->reg)) { + ret = regulator_enable(st->reg); + if (ret) + goto error_put_reg; + } + st->client = client; + + st->indio_dev = iio_allocate_device(); + if (st->indio_dev == NULL) { + ret = -ENOMEM; + goto error_disable_reg; + } + + /* Estabilish that the iio_dev is a child of the i2c device */ + st->indio_dev->dev.parent = &client->dev; + st->indio_dev->attrs = &max1363_attribute_group; + st->indio_dev->dev_data = (void *)(st); + st->indio_dev->driver_module = THIS_MODULE; + st->indio_dev->modes = INDIO_DIRECT_MODE; + + ret = max1363_initial_setup(st); + if (ret) + goto error_free_device; + + ret = max1363_register_ring_funcs_and_init(st->indio_dev); + if (ret) + goto error_free_device; + + ret = iio_device_register(st->indio_dev); + if (ret) + goto error_cleanup_ring; + regdone = 1; + ret = max1363_initialize_ring(st->indio_dev->ring); + if (ret) + goto error_cleanup_ring; + return 0; +error_cleanup_ring: + max1363_ring_cleanup(st->indio_dev); +error_free_device: + if (!regdone) + iio_free_device(st->indio_dev); + else + iio_device_unregister(st->indio_dev); +error_disable_reg: + if (!IS_ERR(st->reg)) + regulator_disable(st->reg); +error_put_reg: + if (!IS_ERR(st->reg)) + regulator_put(st->reg); +error_free_st: + kfree(st); + +error_ret: + return ret; +} + +static int max1363_remove(struct i2c_client *client) +{ + struct max1363_state *st = i2c_get_clientdata(client); + struct iio_dev *indio_dev = st->indio_dev; + max1363_uninitialize_ring(indio_dev->ring); + max1363_ring_cleanup(indio_dev); + iio_device_unregister(indio_dev); + if (!IS_ERR(st->reg)) { + regulator_disable(st->reg); + regulator_put(st->reg); + } + kfree(st); + + return 0; +} + +static const struct i2c_device_id max1363_id[] = { + { "max1361", max1361 }, + { "max1362", max1362 }, + { "max1363", max1363 }, + { "max1364", max1364 }, + { "max1136", max1136 }, + { "max1137", max1137 }, + { "max1138", max1138 }, + { "max1139", max1139 }, + { "max1236", max1236 }, + { "max1237", max1237 }, + { "max1238", max1238 }, + { "max1239", max1239 }, + {} +}; + +MODULE_DEVICE_TABLE(i2c, max1363_id); + +static struct i2c_driver max1363_driver = { + .driver = { + .name = "max1363", + }, + .probe = max1363_probe, + .remove = max1363_remove, + .id_table = max1363_id, +}; + +static __init int max1363_init(void) +{ + return i2c_add_driver(&max1363_driver); +} + +static __exit void max1363_exit(void) +{ + i2c_del_driver(&max1363_driver); +} + +MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>"); +MODULE_DESCRIPTION("Maxim 1363 ADC"); +MODULE_LICENSE("GPL v2"); + +module_init(max1363_init); +module_exit(max1363_exit); |