From 2f2c96338afc9f90aa5a0fca04ece1a5c389ee31 Mon Sep 17 00:00:00 2001 From: Kuppuswamy Sathyanarayanan Date: Fri, 17 Apr 2015 22:15:10 -0700 Subject: [PATCH] iio: ltr501: Add regmap support. Added regmap support. It will be useful to handle bitwise updates to als & ps control registers. Signed-off-by: Kuppuswamy Sathyanarayanan Signed-off-by: Jonathan Cameron --- drivers/iio/light/ltr501.c | 129 ++++++++++++++++++++++++------------- 1 file changed, 86 insertions(+), 43 deletions(-) diff --git a/drivers/iio/light/ltr501.c b/drivers/iio/light/ltr501.c index f208c9871107..e2f73547fdc5 100644 --- a/drivers/iio/light/ltr501.c +++ b/drivers/iio/light/ltr501.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -33,6 +34,7 @@ #define LTR501_ALS_DATA0 0x8a /* 16-bit, little endian */ #define LTR501_ALS_PS_STATUS 0x8c #define LTR501_PS_DATA 0x8d /* 16-bit, little endian */ +#define LTR501_MAX_REG 0x9f #define LTR501_ALS_CONTR_SW_RESET BIT(2) #define LTR501_CONTR_PS_GAIN_MASK (BIT(3) | BIT(2)) @@ -45,23 +47,25 @@ #define LTR501_PS_DATA_MASK 0x7ff +#define LTR501_REGMAP_NAME "ltr501_regmap" + struct ltr501_data { struct i2c_client *client; struct mutex lock_als, lock_ps; u8 als_contr, ps_contr; + struct regmap *regmap; }; static int ltr501_drdy(struct ltr501_data *data, u8 drdy_mask) { int tries = 100; - int ret; + int ret, status; while (tries--) { - ret = i2c_smbus_read_byte_data(data->client, - LTR501_ALS_PS_STATUS); + ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status); if (ret < 0) return ret; - if ((ret & drdy_mask) == drdy_mask) + if ((status & drdy_mask) == drdy_mask) return 0; msleep(25); } @@ -72,21 +76,30 @@ static int ltr501_drdy(struct ltr501_data *data, u8 drdy_mask) static int ltr501_read_als(struct ltr501_data *data, __le16 buf[2]) { - int ret = ltr501_drdy(data, LTR501_STATUS_ALS_RDY); + int ret; + + ret = ltr501_drdy(data, LTR501_STATUS_ALS_RDY); if (ret < 0) return ret; /* always read both ALS channels in given order */ - return i2c_smbus_read_i2c_block_data(data->client, - LTR501_ALS_DATA1, - 2 * sizeof(__le16), (u8 *)buf); + return regmap_bulk_read(data->regmap, LTR501_ALS_DATA1, + buf, 2 * sizeof(__le16)); } static int ltr501_read_ps(struct ltr501_data *data) { - int ret = ltr501_drdy(data, LTR501_STATUS_PS_RDY); + int ret, status; + + ret = ltr501_drdy(data, LTR501_STATUS_PS_RDY); + if (ret < 0) + return ret; + + ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA, + &status, 2); if (ret < 0) return ret; - return i2c_smbus_read_word_data(data->client, LTR501_PS_DATA); + + return status; } #define LTR501_INTENSITY_CHANNEL(_idx, _addr, _mod, _shared) { \ @@ -170,11 +183,10 @@ static int ltr501_read_raw(struct iio_dev *indio_dev, *val = 0; *val2 = 5000; return IIO_VAL_INT_PLUS_MICRO; - } else { - *val = 1; - *val2 = 0; - return IIO_VAL_INT; } + *val = 1; + *val2 = 0; + return IIO_VAL_INT; case IIO_PROXIMITY: i = (data->ps_contr & LTR501_CONTR_PS_GAIN_MASK) >> LTR501_CONTR_PS_GAIN_SHIFT; @@ -219,18 +231,18 @@ static int ltr501_write_raw(struct iio_dev *indio_dev, data->als_contr &= ~LTR501_CONTR_ALS_GAIN_MASK; else return -EINVAL; - return i2c_smbus_write_byte_data(data->client, - LTR501_ALS_CONTR, - data->als_contr); + + return regmap_write(data->regmap, LTR501_ALS_CONTR, + data->als_contr); case IIO_PROXIMITY: i = ltr501_get_ps_gain_index(val, val2); if (i < 0) return -EINVAL; data->ps_contr &= ~LTR501_CONTR_PS_GAIN_MASK; data->ps_contr |= i << LTR501_CONTR_PS_GAIN_SHIFT; - return i2c_smbus_write_byte_data(data->client, - LTR501_PS_CONTR, - data->ps_contr); + + return regmap_write(data->regmap, LTR501_PS_CONTR, + data->ps_contr); default: return -EINVAL; } @@ -258,13 +270,15 @@ static const struct iio_info ltr501_info = { .driver_module = THIS_MODULE, }; -static int ltr501_write_contr(struct i2c_client *client, u8 als_val, u8 ps_val) +static int ltr501_write_contr(struct ltr501_data *data, u8 als_val, u8 ps_val) { - int ret = i2c_smbus_write_byte_data(client, LTR501_ALS_CONTR, als_val); + int ret; + + ret = regmap_write(data->regmap, LTR501_ALS_CONTR, als_val); if (ret < 0) return ret; - return i2c_smbus_write_byte_data(client, LTR501_PS_CONTR, ps_val); + return regmap_write(data->regmap, LTR501_PS_CONTR, ps_val); } static irqreturn_t ltr501_trigger_handler(int irq, void *p) @@ -276,7 +290,7 @@ static irqreturn_t ltr501_trigger_handler(int irq, void *p) __le16 als_buf[2]; u8 mask = 0; int j = 0; - int ret; + int ret, psdata; memset(buf, 0, sizeof(buf)); @@ -292,10 +306,8 @@ static irqreturn_t ltr501_trigger_handler(int irq, void *p) goto done; if (mask & LTR501_STATUS_ALS_RDY) { - ret = i2c_smbus_read_i2c_block_data(data->client, - LTR501_ALS_DATA1, - sizeof(als_buf), - (u8 *)als_buf); + ret = regmap_bulk_read(data->regmap, LTR501_ALS_DATA1, + (u8 *)als_buf, sizeof(als_buf)); if (ret < 0) return ret; if (test_bit(0, indio_dev->active_scan_mask)) @@ -305,10 +317,11 @@ static irqreturn_t ltr501_trigger_handler(int irq, void *p) } if (mask & LTR501_STATUS_PS_RDY) { - ret = i2c_smbus_read_word_data(data->client, LTR501_PS_DATA); + ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA, + &psdata, 2); if (ret < 0) goto done; - buf[j++] = ret & LTR501_PS_DATA_MASK; + buf[j++] = psdata & LTR501_PS_DATA_MASK; } iio_push_to_buffers_with_timestamp(indio_dev, buf, iio_get_time_ns()); @@ -321,26 +334,48 @@ done: static int ltr501_init(struct ltr501_data *data) { - int ret; + int ret, status; - ret = i2c_smbus_read_byte_data(data->client, LTR501_ALS_CONTR); + ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status); if (ret < 0) return ret; - data->als_contr = ret | LTR501_CONTR_ACTIVE; - ret = i2c_smbus_read_byte_data(data->client, LTR501_PS_CONTR); + data->als_contr = status | LTR501_CONTR_ACTIVE; + + ret = regmap_read(data->regmap, LTR501_PS_CONTR, &status); if (ret < 0) return ret; - data->ps_contr = ret | LTR501_CONTR_ACTIVE; - return ltr501_write_contr(data->client, data->als_contr, - data->ps_contr); + data->ps_contr = status | LTR501_CONTR_ACTIVE; + + return ltr501_write_contr(data, data->als_contr, data->ps_contr); } +static bool ltr501_is_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case LTR501_ALS_DATA1: + case LTR501_ALS_DATA0: + case LTR501_ALS_PS_STATUS: + case LTR501_PS_DATA: + return true; + default: + return false; + } +} + +static struct regmap_config ltr501_regmap_config = { + .name = LTR501_REGMAP_NAME, + .reg_bits = 8, + .val_bits = 8, + .max_register = LTR501_MAX_REG, + .cache_type = REGCACHE_RBTREE, + .volatile_reg = ltr501_is_volatile_reg, +}; + static int ltr501_powerdown(struct ltr501_data *data) { - return ltr501_write_contr(data->client, - data->als_contr & ~LTR501_CONTR_ACTIVE, + return ltr501_write_contr(data, data->als_contr & ~LTR501_CONTR_ACTIVE, data->ps_contr & ~LTR501_CONTR_ACTIVE); } @@ -349,22 +384,30 @@ static int ltr501_probe(struct i2c_client *client, { struct ltr501_data *data; struct iio_dev *indio_dev; - int ret; + struct regmap *regmap; + int ret, partid; indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); if (!indio_dev) return -ENOMEM; + regmap = devm_regmap_init_i2c(client, <r501_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&client->dev, "Regmap initialization failed.\n"); + return PTR_ERR(regmap); + } + data = iio_priv(indio_dev); i2c_set_clientdata(client, indio_dev); data->client = client; + data->regmap = regmap; mutex_init(&data->lock_als); mutex_init(&data->lock_ps); - ret = i2c_smbus_read_byte_data(data->client, LTR501_PART_ID); + ret = regmap_read(data->regmap, LTR501_PART_ID, &partid); if (ret < 0) return ret; - if ((ret >> 4) != 0x8) + if ((partid >> 4) != 0x8) return -ENODEV; indio_dev->dev.parent = &client->dev; @@ -420,7 +463,7 @@ static int ltr501_resume(struct device *dev) struct ltr501_data *data = iio_priv(i2c_get_clientdata( to_i2c_client(dev))); - return ltr501_write_contr(data->client, data->als_contr, + return ltr501_write_contr(data, data->als_contr, data->ps_contr); } #endif -- 2.20.1