diff options
author | Michael Hennerich <michael.hennerich@analog.com> | 2011-03-09 15:01:45 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-03-09 23:50:27 (GMT) |
commit | 14f88f1b07e03b064b86ebc9f2f1ed0719dfaa30 (patch) | |
tree | d5da0252fbb7673b93b6ca55763308dcc5abf59e | |
parent | 1f0e427007d2dc3679faecdf61aaf8673abbb5e8 (diff) | |
download | linux-fsl-qoriq-14f88f1b07e03b064b86ebc9f2f1ed0719dfaa30.tar.xz |
Staging: IIO: DAC: AD5624R: Update to IIO ABI
This driver did not conform with the IIO ABI for such devices.
Also the sysfs files that this driver adds were not complete and
partially un-documented.
Update and document ABI
Change License notice, stick to GPL-v2.
Fix indention style
Add option to specify external reference voltage via the regulator framework.
Add mandatory name attribute
Add mandatory out_scale attribute
Changes since V1:
Refine outY_powerdown_mode description
Remove bonus white line
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r-- | drivers/staging/iio/Documentation/sysfs-bus-iio | 32 | ||||
-rw-r--r-- | drivers/staging/iio/dac/ad5624r.h | 89 | ||||
-rw-r--r-- | drivers/staging/iio/dac/ad5624r_spi.c | 241 |
3 files changed, 251 insertions, 111 deletions
diff --git a/drivers/staging/iio/Documentation/sysfs-bus-iio b/drivers/staging/iio/Documentation/sysfs-bus-iio index 8058fcb..4915aee 100644 --- a/drivers/staging/iio/Documentation/sysfs-bus-iio +++ b/drivers/staging/iio/Documentation/sysfs-bus-iio @@ -271,6 +271,38 @@ Description: where a single output sets the value for multiple channels simultaneously. +What: /sys/bus/iio/devices/deviceX/outY_powerdown_mode +What: /sys/bus/iio/devices/deviceX/out_powerdown_mode +KernelVersion: 2.6.38 +Contact: linux-iio@vger.kernel.org +Description: + Specifies the output powerdown mode. + DAC output stage is disconnected from the amplifier and + 1kohm_to_gnd: connected to ground via an 1kOhm resistor + 100kohm_to_gnd: connected to ground via an 100kOhm resistor + three_state: left floating + For a list of available output power down options read + outX_powerdown_mode_available. If Y is not present the + mode is shared across all outputs. + +What: /sys/bus/iio/devices/deviceX/outY_powerdown_mode_available +What: /sys/bus/iio/devices/deviceX/out_powerdown_mode_available +KernelVersion: 2.6.38 +Contact: linux-iio@vger.kernel.org +Description: + Lists all available output power down modes. + If Y is not present the mode is shared across all outputs. + +What: /sys/bus/iio/devices/deviceX/outY_powerdown +What: /sys/bus/iio/devices/deviceX/out_powerdown +KernelVersion: 2.6.38 +Contact: linux-iio@vger.kernel.org +Description: + Writing 1 causes output Y to enter the power down mode specified + by the corresponding outY_powerdown_mode. Clearing returns to + normal operation. Y may be suppressed if all outputs are + controlled together. + What: /sys/bus/iio/devices/deviceX/deviceX:eventY KernelVersion: 2.6.35 Contact: linux-iio@vger.kernel.org diff --git a/drivers/staging/iio/dac/ad5624r.h b/drivers/staging/iio/dac/ad5624r.h index ce518be..c16df4e 100644 --- a/drivers/staging/iio/dac/ad5624r.h +++ b/drivers/staging/iio/dac/ad5624r.h @@ -1,21 +1,80 @@ +/* + * AD5624R SPI DAC driver + * + * Copyright 2010-2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ #ifndef SPI_AD5624R_H_ #define SPI_AD5624R_H_ -#define AD5624R_DAC_CHANNELS 4 +#define AD5624R_DAC_CHANNELS 4 -#define AD5624R_ADDR_DAC0 0x0 -#define AD5624R_ADDR_DAC1 0x1 -#define AD5624R_ADDR_DAC2 0x2 -#define AD5624R_ADDR_DAC3 0x3 -#define AD5624R_ADDR_ALL_DAC 0x7 +#define AD5624R_ADDR_DAC0 0x0 +#define AD5624R_ADDR_DAC1 0x1 +#define AD5624R_ADDR_DAC2 0x2 +#define AD5624R_ADDR_DAC3 0x3 +#define AD5624R_ADDR_ALL_DAC 0x7 -#define AD5624R_CMD_WRITE_INPUT_N 0x0 -#define AD5624R_CMD_UPDATE_DAC_N 0x1 -#define AD5624R_CMD_WRITE_INPUT_N_UPDATE_ALL 0x2 -#define AD5624R_CMD_WRITE_INPUT_N_UPDATE_N 0x3 -#define AD5624R_CMD_POWERDOWN_DAC 0x4 -#define AD5624R_CMD_RESET 0x5 -#define AD5624R_CMD_LDAC_SETUP 0x6 -#define AD5624R_CMD_INTERNAL_REFER_SETUP 0x7 +#define AD5624R_CMD_WRITE_INPUT_N 0x0 +#define AD5624R_CMD_UPDATE_DAC_N 0x1 +#define AD5624R_CMD_WRITE_INPUT_N_UPDATE_ALL 0x2 +#define AD5624R_CMD_WRITE_INPUT_N_UPDATE_N 0x3 +#define AD5624R_CMD_POWERDOWN_DAC 0x4 +#define AD5624R_CMD_RESET 0x5 +#define AD5624R_CMD_LDAC_SETUP 0x6 +#define AD5624R_CMD_INTERNAL_REFER_SETUP 0x7 -#endif +#define AD5624R_LDAC_PWRDN_NONE 0x0 +#define AD5624R_LDAC_PWRDN_1K 0x1 +#define AD5624R_LDAC_PWRDN_100K 0x2 +#define AD5624R_LDAC_PWRDN_3STATE 0x3 + +/** + * struct ad5624r_chip_info - chip specific information + * @bits: accuracy of the DAC in bits + * @int_vref_mv: AD5620/40/60: the internal reference voltage + */ + +struct ad5624r_chip_info { + u8 bits; + u16 int_vref_mv; +}; + +/** + * struct ad5446_state - driver instance specific data + * @indio_dev: the industrial I/O device + * @us: spi_device + * @chip_info: chip model specific constants, available modes etc + * @reg: supply regulator + * @vref_mv: actual reference voltage used + * @pwr_down_mask power down mask + * @pwr_down_mode current power down mode + */ + +struct ad5624r_state { + struct iio_dev *indio_dev; + struct spi_device *us; + const struct ad5624r_chip_info *chip_info; + struct regulator *reg; + unsigned short vref_mv; + unsigned pwr_down_mask; + unsigned pwr_down_mode; +}; + +/** + * ad5624r_supported_device_ids: + * The AD5624/44/64 parts are available in different + * fixed internal reference voltage options. + */ + +enum ad5624r_supported_device_ids { + ID_AD5624R3, + ID_AD5644R3, + ID_AD5664R3, + ID_AD5624R5, + ID_AD5644R5, + ID_AD5664R5, +}; + +#endif /* SPI_AD5624R_H_ */ diff --git a/drivers/staging/iio/dac/ad5624r_spi.c b/drivers/staging/iio/dac/ad5624r_spi.c index 2b1c6dd..0f97ce0 100644 --- a/drivers/staging/iio/dac/ad5624r_spi.c +++ b/drivers/staging/iio/dac/ad5624r_spi.c @@ -1,9 +1,9 @@ /* * AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver * - * Copyright 2010 Analog Devices Inc. + * Copyright 2010-2011 Analog Devices Inc. * - * Licensed under the GPL-2 or later. + * Licensed under the GPL-2. */ #include <linux/interrupt.h> @@ -14,25 +14,38 @@ #include <linux/spi/spi.h> #include <linux/slab.h> #include <linux/sysfs.h> -#include <linux/delay.h> +#include <linux/regulator/consumer.h> #include "../iio.h" #include "../sysfs.h" #include "dac.h" #include "ad5624r.h" -/** - * struct ad5624r_state - device related storage - * @indio_dev: associated industrial IO device - * @us: spi device - **/ -struct ad5624r_state { - struct iio_dev *indio_dev; - struct spi_device *us; - int data_len; - int ldac_mode; - int dac_power_mode[AD5624R_DAC_CHANNELS]; - int internal_ref; +static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = { + [ID_AD5624R3] = { + .bits = 12, + .int_vref_mv = 1250, + }, + [ID_AD5644R3] = { + .bits = 14, + .int_vref_mv = 1250, + }, + [ID_AD5664R3] = { + .bits = 16, + .int_vref_mv = 1250, + }, + [ID_AD5624R5] = { + .bits = 12, + .int_vref_mv = 2500, + }, + [ID_AD5644R5] = { + .bits = 14, + .int_vref_mv = 2500, + }, + [ID_AD5664R5] = { + .bits = 16, + .int_vref_mv = 2500, + }, }; static int ad5624r_spi_write(struct spi_device *spi, @@ -42,11 +55,12 @@ static int ad5624r_spi_write(struct spi_device *spi, u8 msg[3]; /* - * The input shift register is 24 bits wide. The first two bits are don't care bits. - * The next three are the command bits, C2 to C0, followed by the 3-bit DAC address, - * A2 to A0, and then the 16-, 14-, 12-bit data-word. The data-word comprises the 16-, - * 14-, 12-bit input code followed by 0, 2, or 4 don't care bits, for the AD5664R, - * AD5644R, and AD5624R, respectively. + * The input shift register is 24 bits wide. The first two bits are + * don't care bits. The next three are the command bits, C2 to C0, + * followed by the 3-bit DAC address, A2 to A0, and then the + * 16-, 14-, 12-bit data-word. The data-word comprises the 16-, + * 14-, 12-bit input code followed by 0, 2, or 4 don't care bits, + * for the AD5664R, AD5644R, and AD5624R, respectively. */ data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << (16 - len)); msg[0] = data >> 16; @@ -71,40 +85,43 @@ static ssize_t ad5624r_write_dac(struct device *dev, return ret; ret = ad5624r_spi_write(st->us, AD5624R_CMD_WRITE_INPUT_N_UPDATE_N, - this_attr->address, readin, st->data_len); + this_attr->address, readin, + st->chip_info->bits); return ret ? ret : len; } -static ssize_t ad5624r_read_ldac_mode(struct device *dev, +static ssize_t ad5624r_read_powerdown_mode(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *indio_dev = dev_get_drvdata(dev); struct ad5624r_state *st = indio_dev->dev_data; - return sprintf(buf, "%x\n", st->ldac_mode); + char mode[][15] = {"", "1kohm_to_gnd", "100kohm_to_gnd", "three_state"}; + + return sprintf(buf, "%s\n", mode[st->pwr_down_mode]); } -static ssize_t ad5624r_write_ldac_mode(struct device *dev, +static ssize_t ad5624r_write_powerdown_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { - long readin; - int ret; struct iio_dev *indio_dev = dev_get_drvdata(dev); struct ad5624r_state *st = indio_dev->dev_data; + int ret; - ret = strict_strtol(buf, 16, &readin); - if (ret) - return ret; - - ret = ad5624r_spi_write(st->us, AD5624R_CMD_LDAC_SETUP, 0, - readin & 0xF, 16); - st->ldac_mode = readin & 0xF; + if (sysfs_streq(buf, "1kohm_to_gnd")) + st->pwr_down_mode = AD5624R_LDAC_PWRDN_1K; + else if (sysfs_streq(buf, "100kohm_to_gnd")) + st->pwr_down_mode = AD5624R_LDAC_PWRDN_100K; + else if (sysfs_streq(buf, "three_state")) + st->pwr_down_mode = AD5624R_LDAC_PWRDN_3STATE; + else + ret = -EINVAL; return ret ? ret : len; } -static ssize_t ad5624r_read_dac_power_mode(struct device *dev, +static ssize_t ad5624r_read_dac_powerdown(struct device *dev, struct device_attribute *attr, char *buf) { @@ -112,10 +129,11 @@ static ssize_t ad5624r_read_dac_power_mode(struct device *dev, struct ad5624r_state *st = indio_dev->dev_data; struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); - return sprintf(buf, "%d\n", st->dac_power_mode[this_attr->address]); + return sprintf(buf, "%d\n", + !!(st->pwr_down_mask & (1 << this_attr->address))); } -static ssize_t ad5624r_write_dac_power_mode(struct device *dev, +static ssize_t ad5624r_write_dac_powerdown(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { @@ -129,80 +147,82 @@ static ssize_t ad5624r_write_dac_power_mode(struct device *dev, if (ret) return ret; - ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0, - ((readin & 0x3) << 4) | - (1 << this_attr->address), 16); + if (readin == 1) + st->pwr_down_mask |= (1 << this_attr->address); + else if (!readin) + st->pwr_down_mask &= ~(1 << this_attr->address); + else + ret = -EINVAL; - st->dac_power_mode[this_attr->address] = readin & 0x3; + ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0, + (st->pwr_down_mode << 4) | + st->pwr_down_mask, 16); return ret ? ret : len; } -static ssize_t ad5624r_read_internal_ref_mode(struct device *dev, - struct device_attribute *attr, - char *buf) +static ssize_t ad5624r_show_scale(struct device *dev, + struct device_attribute *attr, + char *buf) { - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct ad5624r_state *st = indio_dev->dev_data; + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad5624r_state *st = iio_dev_get_devdata(dev_info); + /* Corresponds to Vref / 2^(bits) */ + unsigned int scale_uv = (st->vref_mv * 1000) >> st->chip_info->bits; - return sprintf(buf, "%d\n", st->internal_ref); + return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000); } +static IIO_DEVICE_ATTR(out_scale, S_IRUGO, ad5624r_show_scale, NULL, 0); -static ssize_t ad5624r_write_internal_ref_mode(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) +static ssize_t ad5624r_show_name(struct device *dev, + struct device_attribute *attr, + char *buf) { - long readin; - int ret; - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct ad5624r_state *st = indio_dev->dev_data; + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad5624r_state *st = iio_dev_get_devdata(dev_info); - ret = strict_strtol(buf, 10, &readin); - if (ret) - return ret; - - ret = ad5624r_spi_write(st->us, AD5624R_CMD_INTERNAL_REFER_SETUP, 0, - !!readin, 16); - - st->internal_ref = !!readin; - - return ret ? ret : len; + return sprintf(buf, "%s\n", spi_get_device_id(st->us)->name); } +static IIO_DEVICE_ATTR(name, S_IRUGO, ad5624r_show_name, NULL, 0); static IIO_DEV_ATTR_OUT_RAW(0, ad5624r_write_dac, AD5624R_ADDR_DAC0); static IIO_DEV_ATTR_OUT_RAW(1, ad5624r_write_dac, AD5624R_ADDR_DAC1); static IIO_DEV_ATTR_OUT_RAW(2, ad5624r_write_dac, AD5624R_ADDR_DAC2); static IIO_DEV_ATTR_OUT_RAW(3, ad5624r_write_dac, AD5624R_ADDR_DAC3); -static IIO_DEVICE_ATTR(ldac_mode, S_IRUGO | S_IWUSR, ad5624r_read_ldac_mode, - ad5624r_write_ldac_mode, 0); -static IIO_DEVICE_ATTR(internal_ref, S_IRUGO | S_IWUSR, - ad5624r_read_internal_ref_mode, - ad5624r_write_internal_ref_mode, 0); +static IIO_DEVICE_ATTR(out_powerdown_mode, S_IRUGO | + S_IWUSR, ad5624r_read_powerdown_mode, + ad5624r_write_powerdown_mode, 0); -#define IIO_DEV_ATTR_DAC_POWER_MODE(_num, _show, _store, _addr) \ - IIO_DEVICE_ATTR(dac_power_mode_##_num, S_IRUGO | S_IWUSR, _show, _store, _addr) +static IIO_CONST_ATTR(out_powerdown_mode_available, + "1kohm_to_gnd 100kohm_to_gnd three_state"); -static IIO_DEV_ATTR_DAC_POWER_MODE(0, ad5624r_read_dac_power_mode, - ad5624r_write_dac_power_mode, 0); -static IIO_DEV_ATTR_DAC_POWER_MODE(1, ad5624r_read_dac_power_mode, - ad5624r_write_dac_power_mode, 1); -static IIO_DEV_ATTR_DAC_POWER_MODE(2, ad5624r_read_dac_power_mode, - ad5624r_write_dac_power_mode, 2); -static IIO_DEV_ATTR_DAC_POWER_MODE(3, ad5624r_read_dac_power_mode, - ad5624r_write_dac_power_mode, 3); +#define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr) \ + IIO_DEVICE_ATTR(out##_num##_powerdown, \ + S_IRUGO | S_IWUSR, _show, _store, _addr) + +static IIO_DEV_ATTR_DAC_POWERDOWN(0, ad5624r_read_dac_powerdown, + ad5624r_write_dac_powerdown, 0); +static IIO_DEV_ATTR_DAC_POWERDOWN(1, ad5624r_read_dac_powerdown, + ad5624r_write_dac_powerdown, 1); +static IIO_DEV_ATTR_DAC_POWERDOWN(2, ad5624r_read_dac_powerdown, + ad5624r_write_dac_powerdown, 2); +static IIO_DEV_ATTR_DAC_POWERDOWN(3, ad5624r_read_dac_powerdown, + ad5624r_write_dac_powerdown, 3); static struct attribute *ad5624r_attributes[] = { &iio_dev_attr_out0_raw.dev_attr.attr, &iio_dev_attr_out1_raw.dev_attr.attr, &iio_dev_attr_out2_raw.dev_attr.attr, &iio_dev_attr_out3_raw.dev_attr.attr, - &iio_dev_attr_dac_power_mode_0.dev_attr.attr, - &iio_dev_attr_dac_power_mode_1.dev_attr.attr, - &iio_dev_attr_dac_power_mode_2.dev_attr.attr, - &iio_dev_attr_dac_power_mode_3.dev_attr.attr, - &iio_dev_attr_ldac_mode.dev_attr.attr, - &iio_dev_attr_internal_ref.dev_attr.attr, + &iio_dev_attr_out0_powerdown.dev_attr.attr, + &iio_dev_attr_out1_powerdown.dev_attr.attr, + &iio_dev_attr_out2_powerdown.dev_attr.attr, + &iio_dev_attr_out3_powerdown.dev_attr.attr, + &iio_dev_attr_out_powerdown_mode.dev_attr.attr, + &iio_const_attr_out_powerdown_mode_available.dev_attr.attr, + &iio_dev_attr_out_scale.dev_attr.attr, + &iio_dev_attr_name.dev_attr.attr, NULL, }; @@ -213,7 +233,7 @@ static const struct attribute_group ad5624r_attribute_group = { static int __devinit ad5624r_probe(struct spi_device *spi) { struct ad5624r_state *st; - int ret = 0; + int ret, voltage_uv = 0; st = kzalloc(sizeof(*st), GFP_KERNEL); if (st == NULL) { @@ -222,18 +242,30 @@ static int __devinit ad5624r_probe(struct spi_device *spi) } spi_set_drvdata(spi, st); - st->data_len = spi_get_device_id(spi)->driver_data; + st->reg = regulator_get(&spi->dev, "vcc"); + if (!IS_ERR(st->reg)) { + ret = regulator_enable(st->reg); + if (ret) + goto error_put_reg; + + voltage_uv = regulator_get_voltage(st->reg); + } + + st->chip_info = + &ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data]; + + if (voltage_uv) + st->vref_mv = voltage_uv / 1000; + else + st->vref_mv = st->chip_info->int_vref_mv; st->us = spi; st->indio_dev = iio_allocate_device(); if (st->indio_dev == NULL) { ret = -ENOMEM; - goto error_free_st; + goto error_disable_reg; } st->indio_dev->dev.parent = &spi->dev; - st->indio_dev->num_interrupt_lines = 0; - st->indio_dev->event_attrs = NULL; - st->indio_dev->attrs = &ad5624r_attribute_group; st->indio_dev->dev_data = (void *)(st); st->indio_dev->driver_module = THIS_MODULE; @@ -243,14 +275,22 @@ static int __devinit ad5624r_probe(struct spi_device *spi) if (ret) goto error_free_dev; - spi->mode = SPI_MODE_0; - spi_setup(spi); + ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0, + !!voltage_uv, 16); + if (ret) + goto error_free_dev; return 0; error_free_dev: iio_free_device(st->indio_dev); -error_free_st: +error_disable_reg: + if (!IS_ERR(st->reg)) + regulator_disable(st->reg); +error_put_reg: + if (!IS_ERR(st->reg)) + regulator_put(st->reg); + kfree(st); error_ret: return ret; @@ -261,15 +301,24 @@ static int __devexit ad5624r_remove(struct spi_device *spi) struct ad5624r_state *st = spi_get_drvdata(spi); iio_device_unregister(st->indio_dev); + + if (!IS_ERR(st->reg)) { + regulator_disable(st->reg); + regulator_put(st->reg); + } + kfree(st); return 0; } static const struct spi_device_id ad5624r_id[] = { - {"ad5624r", 12}, - {"ad5644r", 14}, - {"ad5664r", 16}, + {"ad5624r3", ID_AD5624R3}, + {"ad5644r3", ID_AD5644R3}, + {"ad5664r3", ID_AD5664R3}, + {"ad5624r5", ID_AD5624R5}, + {"ad5644r5", ID_AD5644R5}, + {"ad5664r5", ID_AD5664R5}, {} }; |