From b19e9ad5e2cb9145c81690cec7c826b156d5b3c1 Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Mon, 27 Jun 2011 13:07:51 +0100 Subject: [PATCH] staging:iio:resolver:ad2s1210 general driver cleanup. Note I haven't made any changes to the userspace interface as yet. This is all about cleaning up what was actually there (handling all errors etc). Signed-off-by: Jonathan Cameron Acked-by: Michael Hennerich Signed-off-by: Greg Kroah-Hartman --- drivers/staging/iio/resolver/Kconfig | 27 - drivers/staging/iio/resolver/ad2s1210.c | 856 +++++++++++------------- drivers/staging/iio/resolver/ad2s1210.h | 17 + 3 files changed, 416 insertions(+), 484 deletions(-) create mode 100644 drivers/staging/iio/resolver/ad2s1210.h diff --git a/drivers/staging/iio/resolver/Kconfig b/drivers/staging/iio/resolver/Kconfig index a4a363429355..6ecd79e30038 100644 --- a/drivers/staging/iio/resolver/Kconfig +++ b/drivers/staging/iio/resolver/Kconfig @@ -25,30 +25,3 @@ config AD2S1210 Say yes here to build support for Analog Devices spi resolver to digital converters, ad2s1210, provides direct access via sysfs. -choice - prompt "Resolution Control" - depends on AD2S1210 - default AD2S1210_GPIO_NONE - help - In normal mode, the resolution of the digital output is selected - using the RES0 and RES1 input pins. In configuration mode, the - resolution is selected by setting the RES0 and RES1 bits in the - control regsiter. When switching between normal mode and configuration - mode, there are some schemes to keep them matchs. - -config AD2S1210_GPIO_INPUT - bool "read resolution from gpio pins" - help - GPIO pins are sampling RES0 and RES1 pins, read the resolution - settings from the GPIO pins. - -config AD2S1210_GPIO_OUTPUT - bool "set gpio pins to set resolution" - help - RES0 and RES1 pins are controlled by GPIOs, setting GPIO pins to - set the resolution. - -config AD2S1210_GPIO_NONE - bool "take the responsibility by user" - -endchoice diff --git a/drivers/staging/iio/resolver/ad2s1210.c b/drivers/staging/iio/resolver/ad2s1210.c index 09f4fcfda73a..ecaf7bb790fe 100644 --- a/drivers/staging/iio/resolver/ad2s1210.c +++ b/drivers/staging/iio/resolver/ad2s1210.c @@ -19,44 +19,41 @@ #include "../iio.h" #include "../sysfs.h" +#include "ad2s1210.h" #define DRV_NAME "ad2s1210" -#define DEF_CONTROL 0x7E - -#define MSB_IS_HIGH 0x80 -#define MSB_IS_LOW 0x7F -#define PHASE_LOCK_RANGE_44 0x20 -#define ENABLE_HYSTERESIS 0x10 -#define SET_ENRES1 0x08 -#define SET_ENRES0 0x04 -#define SET_RES1 0x02 -#define SET_RES0 0x01 - -#define SET_ENRESOLUTION (SET_ENRES1 | SET_ENRES0) -#define SET_RESOLUTION (SET_RES1 | SET_RES0) - -#define REG_POSITION 0x80 -#define REG_VELOCITY 0x82 -#define REG_LOS_THRD 0x88 -#define REG_DOS_OVR_THRD 0x89 -#define REG_DOS_MIS_THRD 0x8A -#define REG_DOS_RST_MAX_THRD 0x8B -#define REG_DOS_RST_MIN_THRD 0x8C -#define REG_LOT_HIGH_THRD 0x8D -#define REG_LOT_LOW_THRD 0x8E -#define REG_EXCIT_FREQ 0x91 -#define REG_CONTROL 0x92 -#define REG_SOFT_RESET 0xF0 -#define REG_FAULT 0xFF +#define AD2S1210_DEF_CONTROL 0x7E + +#define AD2S1210_MSB_IS_HIGH 0x80 +#define AD2S1210_MSB_IS_LOW 0x7F +#define AD2S1210_PHASE_LOCK_RANGE_44 0x20 +#define AD2S1210_ENABLE_HYSTERESIS 0x10 +#define AD2S1210_SET_ENRES1 0x08 +#define AD2S1210_SET_ENRES0 0x04 +#define AD2S1210_SET_RES1 0x02 +#define AD2S1210_SET_RES0 0x01 + +#define AD2S1210_SET_ENRESOLUTION (AD2S1210_SET_ENRES1 | \ + AD2S1210_SET_ENRES0) +#define AD2S1210_SET_RESOLUTION (AD2S1210_SET_RES1 | AD2S1210_SET_RES0) + +#define AD2S1210_REG_POSITION 0x80 +#define AD2S1210_REG_VELOCITY 0x82 +#define AD2S1210_REG_LOS_THRD 0x88 +#define AD2S1210_REG_DOS_OVR_THRD 0x89 +#define AD2S1210_REG_DOS_MIS_THRD 0x8A +#define AD2S1210_REG_DOS_RST_MAX_THRD 0x8B +#define AD2S1210_REG_DOS_RST_MIN_THRD 0x8C +#define AD2S1210_REG_LOT_HIGH_THRD 0x8D +#define AD2S1210_REG_LOT_LOW_THRD 0x8E +#define AD2S1210_REG_EXCIT_FREQ 0x91 +#define AD2S1210_REG_CONTROL 0x92 +#define AD2S1210_REG_SOFT_RESET 0xF0 +#define AD2S1210_REG_FAULT 0xFF /* pin SAMPLE, A0, A1, RES0, RES1, is controlled by driver */ #define AD2S1210_SAA 3 -#if defined(CONFIG_AD2S1210_GPIO_INPUT) || defined(CONFIG_AD2S1210_GPIO_OUTPUT) -# define AD2S1210_RES 2 -#else -# define AD2S1210_RES 0 -#endif #define AD2S1210_PN (AD2S1210_SAA + AD2S1210_RES) #define AD2S1210_MIN_CLKIN 6144000 @@ -75,190 +72,153 @@ enum ad2s1210_mode { MOD_POS = 0, MOD_VEL, - MOD_RESERVED, MOD_CONFIG, + MOD_RESERVED, }; -enum ad2s1210_res { - RES_10 = 10, - RES_12 = 12, - RES_14 = 14, - RES_16 = 16, -}; - -static unsigned int resolution_value[] = { - RES_10, RES_12, RES_14, RES_16}; +static const unsigned int ad2s1210_resolution_value[] = { 10, 12, 14, 16 }; struct ad2s1210_state { + const struct ad2s1210_platform_data *pdata; struct mutex lock; - struct iio_dev *idev; struct spi_device *sdev; - struct spi_transfer xfer; - unsigned int hysteresis; - unsigned int old_data; - enum ad2s1210_mode mode; - enum ad2s1210_res resolution; unsigned int fclkin; unsigned int fexcit; - unsigned short sample; - unsigned short a0; - unsigned short a1; - unsigned short res0; - unsigned short res1; - u8 rx[3]; - u8 tx[3]; + bool hysteresis; + bool old_data; + u8 resolution; + enum ad2s1210_mode mode; + u8 rx[2] ____cacheline_aligned; + u8 tx[2] ____cacheline_aligned; }; -static inline void start_sample(struct ad2s1210_state *st) -{ - gpio_set_value(st->sample, 0); -} - -static inline void stop_sample(struct ad2s1210_state *st) -{ - gpio_set_value(st->sample, 1); -} - -static inline void set_mode(enum ad2s1210_mode mode, struct ad2s1210_state *st) +static const int ad2s1210_mode_vals[4][2] = { + [MOD_POS] = { 0, 0 }, + [MOD_VEL] = { 0, 1 }, + [MOD_CONFIG] = { 1, 0 }, +}; +static inline void ad2s1210_set_mode(enum ad2s1210_mode mode, + struct ad2s1210_state *st) { - switch (mode) { - case MOD_POS: - gpio_set_value(st->a0, 0); - gpio_set_value(st->a1, 0); - break; - case MOD_VEL: - gpio_set_value(st->a0, 0); - gpio_set_value(st->a1, 1); - break; - case MOD_CONFIG: - gpio_set_value(st->a0, 1); - gpio_set_value(st->a1, 1); - break; - default: - /* set to reserved mode */ - gpio_set_value(st->a0, 1); - gpio_set_value(st->a1, 0); - } + gpio_set_value(st->pdata->a[0], ad2s1210_mode_vals[mode][0]); + gpio_set_value(st->pdata->a[1], ad2s1210_mode_vals[mode][1]); st->mode = mode; } /* write 1 bytes (address or data) to the chip */ -static int config_write(struct ad2s1210_state *st, - unsigned char data) +static int ad2s1210_config_write(struct ad2s1210_state *st, u8 data) { - struct spi_message msg; - int ret = 0; - - st->xfer.len = 1; - set_mode(MOD_CONFIG, st); + int ret; - spi_message_init(&msg); - spi_message_add_tail(&st->xfer, &msg); + ad2s1210_set_mode(MOD_CONFIG, st); st->tx[0] = data; - ret = spi_sync(st->sdev, &msg); - if (ret) + ret = spi_write(st->sdev, st->tx, 1); + if (ret < 0) return ret; - st->old_data = 1; - return ret; + st->old_data = true; + + return 0; } /* read value from one of the registers */ -static int config_read(struct ad2s1210_state *st, - unsigned char address, - unsigned char *data) -{ +static int ad2s1210_config_read(struct ad2s1210_state *st, + unsigned char address) +{ + struct spi_transfer xfer = { + .len = 2, + .rx_buf = st->rx, + .tx_buf = st->tx, + }; struct spi_message msg; int ret = 0; - st->xfer.len = 2; - set_mode(MOD_CONFIG, st); - + ad2s1210_set_mode(MOD_CONFIG, st); spi_message_init(&msg); - spi_message_add_tail(&st->xfer, &msg); - st->tx[0] = address | MSB_IS_HIGH; - st->tx[1] = REG_FAULT; + spi_message_add_tail(&xfer, &msg); + st->tx[0] = address | AD2S1210_MSB_IS_HIGH; + st->tx[1] = AD2S1210_REG_FAULT; ret = spi_sync(st->sdev, &msg); - if (ret) + if (ret < 0) return ret; - *data = st->rx[1]; - st->old_data = 1; - return ret; + st->old_data = true; + + return st->rx[1]; } -static inline void update_frequency_control_word(struct ad2s1210_state *st) +static inline +int ad2s1210_update_frequency_control_word(struct ad2s1210_state *st) { + int ret; unsigned char fcw; + fcw = (unsigned char)(st->fexcit * (1 << 15) / st->fclkin); - if (fcw >= AD2S1210_MIN_FCW && fcw <= AD2S1210_MAX_FCW) { - config_write(st, REG_EXCIT_FREQ); - config_write(st, fcw); - } else + if (fcw < AD2S1210_MIN_FCW || fcw > AD2S1210_MAX_FCW) { pr_err("ad2s1210: FCW out of range\n"); + return -ERANGE; + } + + ret = ad2s1210_config_write(st, AD2S1210_REG_EXCIT_FREQ); + if (ret < 0) + return ret; + + return ad2s1210_config_write(st, fcw); } -#if defined(CONFIG_AD2S1210_GPIO_INPUT) -static inline unsigned char read_resolution_pin(struct ad2s1210_state *st) +static unsigned char ad2s1210_read_resolution_pin(struct ad2s1210_state *st) { - unsigned int data; - data = (gpio_get_value(st->res0) << 1) | - gpio_get_value(st->res1); - return resolution_value[data]; + return ad2s1210_resolution_value[ + (gpio_get_value(st->pdata->res[0]) << 1) | + gpio_get_value(st->pdata->res[1])]; } -#elif defined(CONFIG_AD2S1210_GPIO_OUTPUT) -static inline void set_resolution_pin(struct ad2s1210_state *st) + +static const int ad2s1210_res_pins[4][2] = { + { 0, 0 }, {0, 1}, {1, 0}, {1, 1} +}; + +static inline void ad2s1210_set_resolution_pin(struct ad2s1210_state *st) { - switch (st->resolution) { - case RES_10: - gpio_set_value(st->res0, 0); - gpio_set_value(st->res1, 0); - break; - case RES_12: - gpio_set_value(st->res0, 0); - gpio_set_value(st->res1, 1); - break; - case RES_14: - gpio_set_value(st->res0, 1); - gpio_set_value(st->res1, 0); - break; - case RES_16: - gpio_set_value(st->res0, 1); - gpio_set_value(st->res1, 1); - break; - } + gpio_set_value(st->pdata->res[0], + ad2s1210_res_pins[(st->resolution - 10)/2][0]); + gpio_set_value(st->pdata->res[1], + ad2s1210_res_pins[(st->resolution - 10)/2][1]); } -#endif -static inline void soft_reset(struct ad2s1210_state *st) +static inline int ad2s1210_soft_reset(struct ad2s1210_state *st) { - config_write(st, REG_SOFT_RESET); - config_write(st, 0x0); + int ret; + + ret = ad2s1210_config_write(st, AD2S1210_REG_SOFT_RESET); + if (ret < 0) + return ret; + + return ad2s1210_config_write(st, 0x0); } /* return the OLD DATA since last spi bus write */ static ssize_t ad2s1210_show_raw(struct device *dev, - struct device_attribute *attr, char *buf) + struct device_attribute *attr, + char *buf) { - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; - int ret; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); + int ret = 0; mutex_lock(&st->lock); if (st->old_data) { ret = sprintf(buf, "0x%x\n", st->rx[0]); - st->old_data = 0; - } else - ret = 0; + st->old_data = false; + } mutex_unlock(&st->lock); + return ret; } static ssize_t ad2s1210_store_raw(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) + struct device_attribute *attr, + const char *buf, + size_t len) { - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); unsigned long udata; unsigned char data; int ret; @@ -266,139 +226,157 @@ static ssize_t ad2s1210_store_raw(struct device *dev, ret = strict_strtoul(buf, 16, &udata); if (ret) return -EINVAL; + data = udata & 0xff; mutex_lock(&st->lock); - config_write(st, data); + ret = ad2s1210_config_write(st, data); mutex_unlock(&st->lock); - return 1; + + return ret < 0 ? ret : len; } static ssize_t ad2s1210_store_softreset(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) + struct device_attribute *attr, + const char *buf, + size_t len) { - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); + int ret; + mutex_lock(&st->lock); - soft_reset(st); + ret = ad2s1210_soft_reset(st); mutex_unlock(&st->lock); - return len; + + return ret < 0 ? ret : len; } static ssize_t ad2s1210_show_fclkin(struct device *dev, - struct device_attribute *attr, char *buf) + struct device_attribute *attr, + char *buf) { - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); return sprintf(buf, "%d\n", st->fclkin); } static ssize_t ad2s1210_store_fclkin(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) + struct device_attribute *attr, + const char *buf, + size_t len) { - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); unsigned long fclkin; int ret; ret = strict_strtoul(buf, 10, &fclkin); - if (!ret && fclkin >= AD2S1210_MIN_CLKIN && - fclkin <= AD2S1210_MAX_CLKIN) { - mutex_lock(&st->lock); - st->fclkin = fclkin; - } else { + if (ret) + return ret; + if (fclkin < AD2S1210_MIN_CLKIN || fclkin > AD2S1210_MAX_CLKIN) { pr_err("ad2s1210: fclkin out of range\n"); return -EINVAL; } - update_frequency_control_word(st); - soft_reset(st); + + mutex_lock(&st->lock); + st->fclkin = fclkin; + + ret = ad2s1210_update_frequency_control_word(st); + if (ret < 0) + goto error_ret; + ret = ad2s1210_soft_reset(st); +error_ret: mutex_unlock(&st->lock); - return len; + + return ret < 0 ? ret : len; } static ssize_t ad2s1210_show_fexcit(struct device *dev, - struct device_attribute *attr, char *buf) + struct device_attribute *attr, + char *buf) { - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); return sprintf(buf, "%d\n", st->fexcit); } static ssize_t ad2s1210_store_fexcit(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) + struct device_attribute *attr, + const char *buf, size_t len) { - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); unsigned long fexcit; int ret; ret = strict_strtoul(buf, 10, &fexcit); - if (!ret && fexcit >= AD2S1210_MIN_EXCIT && - fexcit <= AD2S1210_MAX_EXCIT) { - mutex_lock(&st->lock); - st->fexcit = fexcit; - } else { + if (ret < 0) + return ret; + if (fexcit < AD2S1210_MIN_EXCIT || fexcit > AD2S1210_MAX_EXCIT) { pr_err("ad2s1210: excitation frequency out of range\n"); return -EINVAL; } - update_frequency_control_word(st); - soft_reset(st); + mutex_lock(&st->lock); + st->fexcit = fexcit; + ret = ad2s1210_update_frequency_control_word(st); + if (ret < 0) + goto error_ret; + ret = ad2s1210_soft_reset(st); +error_ret: mutex_unlock(&st->lock); - return len; + + return ret < 0 ? ret : len; } static ssize_t ad2s1210_show_control(struct device *dev, - struct device_attribute *attr, char *buf) + struct device_attribute *attr, + char *buf) { - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; - unsigned char data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); + int ret; mutex_lock(&st->lock); - config_read(st, REG_CONTROL, &data); + ret = ad2s1210_config_read(st, AD2S1210_REG_CONTROL); mutex_unlock(&st->lock); - return sprintf(buf, "0x%x\n", data); + return ret < 0 ? ret : sprintf(buf, "0x%x\n", ret); } static ssize_t ad2s1210_store_control(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); unsigned long udata; unsigned char data; int ret; ret = strict_strtoul(buf, 16, &udata); - if (ret) { - ret = -EINVAL; - goto error_ret; - } + if (ret) + return -EINVAL; + mutex_lock(&st->lock); - config_write(st, REG_CONTROL); - data = udata & MSB_IS_LOW; - config_write(st, data); - config_read(st, REG_CONTROL, &data); - if (data & MSB_IS_HIGH) { + ret = ad2s1210_config_write(st, AD2S1210_REG_CONTROL); + if (ret < 0) + goto error_ret; + data = udata & AD2S1210_MSB_IS_LOW; + ret = ad2s1210_config_write(st, data); + if (ret < 0) + goto error_ret; + + ret = ad2s1210_config_read(st, AD2S1210_REG_CONTROL); + if (ret < 0) + goto error_ret; + if (ret & AD2S1210_MSB_IS_HIGH) { ret = -EIO; pr_err("ad2s1210: write control register fail\n"); goto error_ret; } - st->resolution = resolution_value[data & SET_RESOLUTION]; -#if defined(CONFIG_AD2S1210_GPIO_INPUT) - data = read_resolution_pin(st); - if (data != st->resolution) - pr_warning("ad2s1210: resolution settings not match\n"); -#elif defined(CONFIG_AD2S1210_GPIO_OUTPUT) - set_resolution_pin(st); -#endif + st->resolution + = ad2s1210_resolution_value[data & AD2S1210_SET_RESOLUTION]; + if (st->pdata->gpioin) { + data = ad2s1210_read_resolution_pin(st); + if (data != st->resolution) + pr_warning("ad2s1210: resolution settings not match\n"); + } else + ad2s1210_set_resolution_pin(st); + ret = len; - if (data & ENABLE_HYSTERESIS) - st->hysteresis = 1; - else - st->hysteresis = 0; + st->hysteresis = !!(data & AD2S1210_ENABLE_HYSTERESIS); + error_ret: mutex_unlock(&st->lock); return ret; @@ -407,8 +385,7 @@ error_ret: static ssize_t ad2s1210_show_resolution(struct device *dev, struct device_attribute *attr, char *buf) { - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); return sprintf(buf, "%d\n", st->resolution); } @@ -416,103 +393,109 @@ static ssize_t ad2s1210_store_resolution(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); unsigned char data; unsigned long udata; int ret; ret = strict_strtoul(buf, 10, &udata); - if (ret || udata < RES_10 || udata > RES_16) { + if (ret || udata < 10 || udata > 16) { pr_err("ad2s1210: resolution out of range\n"); return -EINVAL; } mutex_lock(&st->lock); - config_read(st, REG_CONTROL, &data); - data &= ~SET_RESOLUTION; - data |= (udata - RES_10) >> 1; - config_write(st, REG_CONTROL); - config_write(st, data & MSB_IS_LOW); - config_read(st, REG_CONTROL, &data); - if (data & MSB_IS_HIGH) { + ret = ad2s1210_config_read(st, AD2S1210_REG_CONTROL); + if (ret < 0) + goto error_ret; + data = ret; + data &= ~AD2S1210_SET_RESOLUTION; + data |= (udata - 10) >> 1; + ret = ad2s1210_config_write(st, AD2S1210_REG_CONTROL); + if (ret < 0) + goto error_ret; + ret = ad2s1210_config_write(st, data & AD2S1210_MSB_IS_LOW); + if (ret < 0) + goto error_ret; + ret = ad2s1210_config_read(st, AD2S1210_REG_CONTROL); + if (ret < 0) + goto error_ret; + data = ret; + if (data & AD2S1210_MSB_IS_HIGH) { ret = -EIO; pr_err("ad2s1210: setting resolution fail\n"); goto error_ret; } - st->resolution = resolution_value[data & SET_RESOLUTION]; -#if defined(CONFIG_AD2S1210_GPIO_INPUT) - data = read_resolution_pin(st); - if (data != st->resolution) - pr_warning("ad2s1210: resolution settings not match\n"); -#elif defined(CONFIG_AD2S1210_GPIO_OUTPUT) - set_resolution_pin(st); -#endif + st->resolution + = ad2s1210_resolution_value[data & AD2S1210_SET_RESOLUTION]; + if (st->pdata->gpioin) { + data = ad2s1210_read_resolution_pin(st); + if (data != st->resolution) + pr_warning("ad2s1210: resolution settings not match\n"); + } else + ad2s1210_set_resolution_pin(st); ret = len; error_ret: mutex_unlock(&st->lock); return ret; } + /* read the fault register since last sample */ static ssize_t ad2s1210_show_fault(struct device *dev, struct device_attribute *attr, char *buf) { - int ret = 0; - ssize_t len = 0; - unsigned char data; - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); + int ret; mutex_lock(&st->lock); - ret = config_read(st, REG_FAULT, &data); - - if (ret) - goto error_ret; - len = sprintf(buf, "0x%x\n", data); -error_ret: + ret = ad2s1210_config_read(st, AD2S1210_REG_FAULT); mutex_unlock(&st->lock); - return ret ? ret : len; + + return ret ? ret : sprintf(buf, "0x%x\n", ret); } static ssize_t ad2s1210_clear_fault(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) + struct device_attribute *attr, + const char *buf, + size_t len) { - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; - unsigned char data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); + int ret; mutex_lock(&st->lock); - start_sample(st); + gpio_set_value(st->pdata->sample, 0); /* delay (2 * tck + 20) nano seconds */ udelay(1); - stop_sample(st); - config_read(st, REG_FAULT, &data); - start_sample(st); - stop_sample(st); + gpio_set_value(st->pdata->sample, 1); + ret = ad2s1210_config_read(st, AD2S1210_REG_FAULT); + if (ret < 0) + goto error_ret; + gpio_set_value(st->pdata->sample, 0); + gpio_set_value(st->pdata->sample, 1); +error_ret: mutex_unlock(&st->lock); - return 0; + return ret < 0 ? ret : len; } static ssize_t ad2s1210_show_reg(struct device *dev, - struct device_attribute *attr, char *buf) + struct device_attribute *attr, + char *buf) { - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; - unsigned char data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); struct iio_dev_attr *iattr = to_iio_dev_attr(attr); + int ret; mutex_lock(&st->lock); - config_read(st, iattr->address, &data); + ret = ad2s1210_config_read(st, iattr->address); mutex_unlock(&st->lock); - return sprintf(buf, "%d\n", data); + + return ret < 0 ? ret : sprintf(buf, "%d\n", ret); } static ssize_t ad2s1210_store_reg(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); unsigned long data; int ret; struct iio_dev_attr *iattr = to_iio_dev_attr(attr); @@ -521,183 +504,121 @@ static ssize_t ad2s1210_store_reg(struct device *dev, if (ret) return -EINVAL; mutex_lock(&st->lock); - config_write(st, iattr->address); - config_write(st, data & MSB_IS_LOW); + ret = ad2s1210_config_write(st, iattr->address); + if (ret < 0) + goto error_ret; + ret = ad2s1210_config_write(st, data & AD2S1210_MSB_IS_LOW); +error_ret: mutex_unlock(&st->lock); - return len; + return ret < 0 ? ret : len; } static ssize_t ad2s1210_show_pos(struct device *dev, - struct device_attribute *attr, char *buf) + struct device_attribute *attr, + char *buf) { - struct spi_message msg; int ret = 0; ssize_t len = 0; u16 pos; - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); - st->xfer.len = 2; mutex_lock(&st->lock); - start_sample(st); + gpio_set_value(st->pdata->sample, 0); /* delay (6 * tck + 20) nano seconds */ udelay(1); - set_mode(MOD_POS, st); - - spi_message_init(&msg); - spi_message_add_tail(&st->xfer, &msg); - ret = spi_sync(st->sdev, &msg); + ad2s1210_set_mode(MOD_POS, st); + ret = spi_read(st->sdev, st->rx, 2); if (ret) goto error_ret; - pos = ((((u16)(st->rx[0])) << 8) | (st->rx[1])); + pos = be16_to_cpup((u16 *)st->rx); if (st->hysteresis) pos >>= 16 - st->resolution; len = sprintf(buf, "%d\n", pos); error_ret: - stop_sample(st); + gpio_set_value(st->pdata->sample, 1); /* delay (2 * tck + 20) nano seconds */ udelay(1); mutex_unlock(&st->lock); - return ret ? ret : len; + return ret < 0 ? ret : len; } static ssize_t ad2s1210_show_vel(struct device *dev, - struct device_attribute *attr, char *buf) + struct device_attribute *attr, + char *buf) { - struct spi_message msg; unsigned short negative; int ret = 0; ssize_t len = 0; s16 vel; - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; + struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev)); - st->xfer.len = 2; mutex_lock(&st->lock); - start_sample(st); + gpio_set_value(st->pdata->sample, 0); /* delay (6 * tck + 20) nano seconds */ udelay(1); - set_mode(MOD_VEL, st); - - spi_message_init(&msg); - spi_message_add_tail(&st->xfer, &msg); - ret = spi_sync(st->sdev, &msg); + ad2s1210_set_mode(MOD_VEL, st); + ret = spi_read(st->sdev, st->rx, 2); if (ret) goto error_ret; negative = st->rx[0] & 0x80; - vel = ((((s16)(st->rx[0])) << 8) | (st->rx[1])); + vel = be16_to_cpup((s16 *)st->rx); vel >>= 16 - st->resolution; - if (negative) { + if (vel & 0x8000) { negative = (0xffff >> st->resolution) << st->resolution; vel |= negative; } len = sprintf(buf, "%d\n", vel); error_ret: - stop_sample(st); + gpio_set_value(st->pdata->sample, 1); /* delay (2 * tck + 20) nano seconds */ udelay(1); mutex_unlock(&st->lock); - return ret ? ret : len; + return ret < 0 ? ret : len; } -static ssize_t ad2s1210_show_pos_vel(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct spi_message msg; - unsigned short negative; - int ret = 0; - ssize_t len = 0; - u16 pos; - s16 vel; - struct iio_dev *idev = dev_get_drvdata(dev); - struct ad2s1210_state *st = idev->dev_data; - - st->xfer.len = 2; - mutex_lock(&st->lock); - start_sample(st); - /* delay (6 * tck + 20) nano seconds */ - udelay(1); - - set_mode(MOD_POS, st); - - spi_message_init(&msg); - spi_message_add_tail(&st->xfer, &msg); - ret = spi_sync(st->sdev, &msg); - if (ret) - goto error_ret; - pos = ((((u16)(st->rx[0])) << 8) | (st->rx[1])); - if (st->hysteresis) - pos >>= 16 - st->resolution; - len = sprintf(buf, "%d ", pos); - - st->xfer.len = 2; - set_mode(MOD_VEL, st); - spi_message_init(&msg); - spi_message_add_tail(&st->xfer, &msg); - ret = spi_sync(st->sdev, &msg); - if (ret) - goto error_ret; - negative = st->rx[0] & 0x80; - vel = ((((s16)(st->rx[0])) << 8) | (st->rx[1])); - vel >>= 16 - st->resolution; - if (negative) { - negative = (0xffff >> st->resolution) << st->resolution; - vel |= negative; - } - len += sprintf(buf + len, "%d\n", vel); -error_ret: - stop_sample(st); - /* delay (2 * tck + 20) nano seconds */ - udelay(1); - mutex_unlock(&st->lock); - - return ret ? ret : len; -} - -static IIO_CONST_ATTR(description, - "Variable Resolution, 10-Bit to 16Bit R/D\n\ -Converter with Reference Oscillator"); static IIO_DEVICE_ATTR(raw_io, S_IRUGO | S_IWUSR, - ad2s1210_show_raw, ad2s1210_store_raw, 0); + ad2s1210_show_raw, ad2s1210_store_raw, 0); static IIO_DEVICE_ATTR(reset, S_IWUSR, - NULL, ad2s1210_store_softreset, 0); + NULL, ad2s1210_store_softreset, 0); static IIO_DEVICE_ATTR(fclkin, S_IRUGO | S_IWUSR, - ad2s1210_show_fclkin, ad2s1210_store_fclkin, 0); + ad2s1210_show_fclkin, ad2s1210_store_fclkin, 0); static IIO_DEVICE_ATTR(fexcit, S_IRUGO | S_IWUSR, - ad2s1210_show_fexcit, ad2s1210_store_fexcit, 0); + ad2s1210_show_fexcit, ad2s1210_store_fexcit, 0); static IIO_DEVICE_ATTR(control, S_IRUGO | S_IWUSR, - ad2s1210_show_control, ad2s1210_store_control, 0); + ad2s1210_show_control, ad2s1210_store_control, 0); static IIO_DEVICE_ATTR(bits, S_IRUGO | S_IWUSR, - ad2s1210_show_resolution, ad2s1210_store_resolution, 0); + ad2s1210_show_resolution, ad2s1210_store_resolution, 0); static IIO_DEVICE_ATTR(fault, S_IRUGO | S_IWUSR, - ad2s1210_show_fault, ad2s1210_clear_fault, 0); -static IIO_DEVICE_ATTR(pos, S_IRUGO, - ad2s1210_show_pos, NULL, 0); -static IIO_DEVICE_ATTR(vel, S_IRUGO, - ad2s1210_show_vel, NULL, 0); -static IIO_DEVICE_ATTR(pos_vel, S_IRUGO, - ad2s1210_show_pos_vel, NULL, 0); + ad2s1210_show_fault, ad2s1210_clear_fault, 0); +static IIO_DEVICE_ATTR(pos, S_IRUGO, ad2s1210_show_pos, NULL, 0); +static IIO_DEVICE_ATTR(vel, S_IRUGO, ad2s1210_show_vel, NULL, 0); static IIO_DEVICE_ATTR(los_thrd, S_IRUGO | S_IWUSR, - ad2s1210_show_reg, ad2s1210_store_reg, REG_LOS_THRD); + ad2s1210_show_reg, ad2s1210_store_reg, + AD2S1210_REG_LOS_THRD); static IIO_DEVICE_ATTR(dos_ovr_thrd, S_IRUGO | S_IWUSR, - ad2s1210_show_reg, ad2s1210_store_reg, REG_DOS_OVR_THRD); + ad2s1210_show_reg, ad2s1210_store_reg, + AD2S1210_REG_DOS_OVR_THRD); static IIO_DEVICE_ATTR(dos_mis_thrd, S_IRUGO | S_IWUSR, - ad2s1210_show_reg, ad2s1210_store_reg, REG_DOS_MIS_THRD); + ad2s1210_show_reg, ad2s1210_store_reg, + AD2S1210_REG_DOS_MIS_THRD); static IIO_DEVICE_ATTR(dos_rst_max_thrd, S_IRUGO | S_IWUSR, - ad2s1210_show_reg, ad2s1210_store_reg, REG_DOS_RST_MAX_THRD); + ad2s1210_show_reg, ad2s1210_store_reg, + AD2S1210_REG_DOS_RST_MAX_THRD); static IIO_DEVICE_ATTR(dos_rst_min_thrd, S_IRUGO | S_IWUSR, - ad2s1210_show_reg, ad2s1210_store_reg, REG_DOS_RST_MIN_THRD); + ad2s1210_show_reg, ad2s1210_store_reg, + AD2S1210_REG_DOS_RST_MIN_THRD); static IIO_DEVICE_ATTR(lot_high_thrd, S_IRUGO | S_IWUSR, - ad2s1210_show_reg, ad2s1210_store_reg, REG_LOT_HIGH_THRD); + ad2s1210_show_reg, ad2s1210_store_reg, + AD2S1210_REG_LOT_HIGH_THRD); static IIO_DEVICE_ATTR(lot_low_thrd, S_IRUGO | S_IWUSR, - ad2s1210_show_reg, ad2s1210_store_reg, REG_LOT_LOW_THRD); + ad2s1210_show_reg, ad2s1210_store_reg, + AD2S1210_REG_LOT_LOW_THRD); static struct attribute *ad2s1210_attributes[] = { - &iio_const_attr_description.dev_attr.attr, &iio_dev_attr_raw_io.dev_attr.attr, &iio_dev_attr_reset.dev_attr.attr, &iio_dev_attr_fclkin.dev_attr.attr, @@ -707,7 +628,6 @@ static struct attribute *ad2s1210_attributes[] = { &iio_dev_attr_fault.dev_attr.attr, &iio_dev_attr_pos.dev_attr.attr, &iio_dev_attr_vel.dev_attr.attr, - &iio_dev_attr_pos_vel.dev_attr.attr, &iio_dev_attr_los_thrd.dev_attr.attr, &iio_dev_attr_dos_ovr_thrd.dev_attr.attr, &iio_dev_attr_dos_mis_thrd.dev_attr.attr, @@ -729,27 +649,32 @@ static int __devinit ad2s1210_initial(struct ad2s1210_state *st) int ret; mutex_lock(&st->lock); -#if defined(CONFIG_AD2S1210_GPIO_INPUT) - st->resolution = read_resolution_pin(st); -#elif defined(CONFIG_AD2S1210_GPIO_OUTPUT) - set_resolution_pin(st); -#endif - - config_write(st, REG_CONTROL); - data = DEF_CONTROL & ~(SET_RESOLUTION); - data |= (st->resolution - RES_10) >> 1; - config_write(st, data); - ret = config_read(st, REG_CONTROL, &data); - if (ret) + if (st->pdata->gpioin) + st->resolution = ad2s1210_read_resolution_pin(st); + else + ad2s1210_set_resolution_pin(st); + + ret = ad2s1210_config_write(st, AD2S1210_REG_CONTROL); + if (ret < 0) + goto error_ret; + data = AD2S1210_DEF_CONTROL & ~(AD2S1210_SET_RESOLUTION); + data |= (st->resolution - 10) >> 1; + ret = ad2s1210_config_write(st, data); + if (ret < 0) + goto error_ret; + ret = ad2s1210_config_read(st, AD2S1210_REG_CONTROL); + if (ret < 0) goto error_ret; - if (data & MSB_IS_HIGH) { + if (ret & AD2S1210_MSB_IS_HIGH) { ret = -EIO; goto error_ret; } - update_frequency_control_word(st); - soft_reset(st); + ret = ad2s1210_update_frequency_control_word(st); + if (ret < 0) + goto error_ret; + ret = ad2s1210_soft_reset(st); error_ret: mutex_unlock(&st->lock); return ret; @@ -760,90 +685,107 @@ static const struct iio_info ad2s1210_info = { .driver_module = THIS_MODULE, }; +static int ad2s1210_setup_gpios(struct ad2s1210_state *st) +{ + int ret; + unsigned long flags = st->pdata->gpioin ? GPIOF_DIR_IN : GPIOF_DIR_OUT; + + ret = gpio_request_one(st->pdata->sample, GPIOF_DIR_IN, "sample"); + if (ret < 0) + goto error_ret; + ret = gpio_request_one(st->pdata->a[0], flags, "a0"); + if (ret < 0) + goto error_free_sample; + ret = gpio_request_one(st->pdata->a[1], flags, "a1"); + if (ret < 0) + goto error_free_a0; + ret = gpio_request_one(st->pdata->res[1], flags, "res0"); + if (ret < 0) + goto error_free_a1; + ret = gpio_request_one(st->pdata->res[1], flags, "res1"); + if (ret < 0) + goto error_free_res0; + + return 0; +error_free_res0: + gpio_free(st->pdata->res[0]); +error_free_a1: + gpio_free(st->pdata->a[1]); +error_free_a0: + gpio_free(st->pdata->a[0]); +error_free_sample: + gpio_free(st->pdata->sample); +error_ret: + return ret; +} + +static void ad2s1210_free_gpios(struct ad2s1210_state *st) +{ + gpio_free(st->pdata->res[1]); + gpio_free(st->pdata->res[0]); + gpio_free(st->pdata->a[1]); + gpio_free(st->pdata->a[0]); + gpio_free(st->pdata->sample); +} + static int __devinit ad2s1210_probe(struct spi_device *spi) { + struct iio_dev *indio_dev; struct ad2s1210_state *st; - int pn, ret = 0; - unsigned short *pins = spi->dev.platform_data; - - for (pn = 0; pn < AD2S1210_PN; pn++) { - if (gpio_request(pins[pn], DRV_NAME)) { - pr_err("%s: request gpio pin %d failed\n", - DRV_NAME, pins[pn]); - goto error_ret; - } - if (pn < AD2S1210_SAA) - gpio_direction_output(pins[pn], 1); - else { -#if defined(CONFIG_AD2S1210_GPIO_INPUT) - gpio_direction_input(pins[pn]); -#elif defined(CONFIG_AD2S1210_GPIO_OUTPUT) - gpio_direction_output(pins[pn], 1); -#endif - } - } + int ret; + + if (spi->dev.platform_data == NULL) + return -EINVAL; - st = kzalloc(sizeof(*st), GFP_KERNEL); - if (st == NULL) { + indio_dev = iio_allocate_device(sizeof(*st)); + if (indio_dev == NULL) { ret = -ENOMEM; goto error_ret; } - spi_set_drvdata(spi, st); + st = iio_priv(indio_dev); + st->pdata = spi->dev.platform_data; + ret = ad2s1210_setup_gpios(st); + if (ret < 0) + goto error_free_dev; + + spi_set_drvdata(spi, indio_dev); mutex_init(&st->lock); st->sdev = spi; - st->xfer.tx_buf = st->tx; - st->xfer.rx_buf = st->rx; - st->hysteresis = 1; + st->hysteresis = true; st->mode = MOD_CONFIG; - st->resolution = RES_12; - st->fclkin = AD2S1210_DEF_CLKIN; + st->resolution = 12; st->fexcit = AD2S1210_DEF_EXCIT; - st->sample = pins[0]; - st->a0 = pins[1]; - st->a1 = pins[2]; - st->res0 = pins[3]; - st->res1 = pins[4]; - - st->idev = iio_allocate_device(0); - if (st->idev == NULL) { - ret = -ENOMEM; - goto error_free_st; - } - st->idev->dev.parent = &spi->dev; - st->idev->info = &ad2s1210_info; - st->idev->dev_data = (void *)(st); - st->idev->modes = INDIO_DIRECT_MODE; + indio_dev->dev.parent = &spi->dev; + indio_dev->info = &ad2s1210_info; + indio_dev->modes = INDIO_DIRECT_MODE; - ret = iio_device_register(st->idev); + ret = iio_device_register(indio_dev); if (ret) - goto error_free_dev; + goto error_free_gpios; - if (spi->max_speed_hz != AD2S1210_DEF_CLKIN) - st->fclkin = spi->max_speed_hz; + st->fclkin = spi->max_speed_hz; spi->mode = SPI_MODE_3; spi_setup(spi); - ad2s1210_initial(st); + return 0; +error_free_gpios: + ad2s1210_free_gpios(st); error_free_dev: - iio_free_device(st->idev); -error_free_st: - kfree(st); + iio_free_device(indio_dev); error_ret: - for (--pn; pn >= 0; pn--) - gpio_free(pins[pn]); return ret; } static int __devexit ad2s1210_remove(struct spi_device *spi) { - struct ad2s1210_state *st = spi_get_drvdata(spi); - - iio_device_unregister(st->idev); - kfree(st); + struct iio_dev *indio_dev = spi_get_drvdata(spi); + struct ad2s1210_state *st = iio_priv(indio_dev); + iio_device_unregister(indio_dev); + ad2s1210_free_gpios(st); return 0; } diff --git a/drivers/staging/iio/resolver/ad2s1210.h b/drivers/staging/iio/resolver/ad2s1210.h new file mode 100644 index 000000000000..aec0bdca16a4 --- /dev/null +++ b/drivers/staging/iio/resolver/ad2s1210.h @@ -0,0 +1,17 @@ +/* + * ad2s1210.h plaform data for the ADI Resolver to Digital Converters: + * AD2S1210 + * + * Copyright (c) 2010-2010 Analog Devices Inc. + * + * 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. + */ + +struct ad2s1210_platform_data { + unsigned sample; + unsigned a[2]; + unsigned res[2]; + bool gpioin; +}; -- 2.20.1