diff options
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/frequency/adf4350.c | 58 |
1 files changed, 49 insertions, 9 deletions
diff --git a/drivers/iio/frequency/adf4350.c b/drivers/iio/frequency/adf4350.c index e76d4ace53f..f6849c8b6a9 100644 --- a/drivers/iio/frequency/adf4350.c +++ b/drivers/iio/frequency/adf4350.c @@ -1,7 +1,7 @@ /* * ADF4350/ADF4351 SPI Wideband Synthesizer driver * - * Copyright 2012 Analog Devices Inc. + * Copyright 2012-2013 Analog Devices Inc. * * Licensed under the GPL-2. */ @@ -17,6 +17,7 @@ #include <linux/gcd.h> #include <linux/gpio.h> #include <asm/div64.h> +#include <linux/clk.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> @@ -33,6 +34,7 @@ struct adf4350_state { struct spi_device *spi; struct regulator *reg; struct adf4350_platform_data *pdata; + struct clk *clk; unsigned long clkin; unsigned long chspc; /* Channel Spacing */ unsigned long fpfd; /* Phase Frequency Detector */ @@ -43,7 +45,7 @@ struct adf4350_state { unsigned r4_rf_div_sel; unsigned long regs[6]; unsigned long regs_hw[6]; - + unsigned long long freq_req; /* * DMA (thus cache coherency maintenance) requires the * transfer buffers to live in their own cache lines. @@ -52,7 +54,6 @@ struct adf4350_state { }; static struct adf4350_platform_data default_pdata = { - .clkin = 122880000, .channel_spacing = 10000, .r2_user_settings = ADF4350_REG2_PD_POLARITY_POS | ADF4350_REG2_CHARGE_PUMP_CURR_uA(2500), @@ -235,6 +236,7 @@ static int adf4350_set_freq(struct adf4350_state *st, unsigned long long freq) ADF4350_REG4_MUTE_TILL_LOCK_EN)); st->regs[ADF4350_REG5] = ADF4350_REG5_LD_PIN_MODE_DIGITAL; + st->freq_req = freq; return adf4350_sync_config(st); } @@ -246,6 +248,7 @@ static ssize_t adf4350_write(struct iio_dev *indio_dev, { struct adf4350_state *st = iio_priv(indio_dev); unsigned long long readin; + unsigned long tmp; int ret; ret = kstrtoull(buf, 10, &readin); @@ -258,10 +261,23 @@ static ssize_t adf4350_write(struct iio_dev *indio_dev, ret = adf4350_set_freq(st, readin); break; case ADF4350_FREQ_REFIN: - if (readin > ADF4350_MAX_FREQ_REFIN) + if (readin > ADF4350_MAX_FREQ_REFIN) { ret = -EINVAL; - else - st->clkin = readin; + break; + } + + if (st->clk) { + tmp = clk_round_rate(st->clk, readin); + if (tmp != readin) { + ret = -EINVAL; + break; + } + ret = clk_set_rate(st->clk, tmp); + if (ret < 0) + break; + } + st->clkin = readin; + ret = adf4350_set_freq(st, st->freq_req); break; case ADF4350_FREQ_RESOLUTION: if (readin == 0) @@ -308,6 +324,9 @@ static ssize_t adf4350_read(struct iio_dev *indio_dev, } break; case ADF4350_FREQ_REFIN: + if (st->clk) + st->clkin = clk_get_rate(st->clk); + val = st->clkin; break; case ADF4350_FREQ_RESOLUTION: @@ -318,6 +337,7 @@ static ssize_t adf4350_read(struct iio_dev *indio_dev, break; default: ret = -EINVAL; + val = 0; } mutex_unlock(&indio_dev->mlock); @@ -360,14 +380,24 @@ static int adf4350_probe(struct spi_device *spi) struct adf4350_platform_data *pdata = spi->dev.platform_data; struct iio_dev *indio_dev; struct adf4350_state *st; + struct clk *clk = NULL; int ret; if (!pdata) { dev_warn(&spi->dev, "no platform data? using default\n"); - pdata = &default_pdata; } + if (!pdata->clkin) { + clk = clk_get(&spi->dev, "clkin"); + if (IS_ERR(clk)) + return -EPROBE_DEFER; + + ret = clk_prepare_enable(clk); + if (ret < 0) + return ret; + } + indio_dev = iio_device_alloc(sizeof(*st)); if (indio_dev == NULL) return -ENOMEM; @@ -395,7 +425,12 @@ static int adf4350_probe(struct spi_device *spi) indio_dev->num_channels = 1; st->chspc = pdata->channel_spacing; - st->clkin = pdata->clkin; + if (clk) { + st->clk = clk; + st->clkin = clk_get_rate(clk); + } else { + st->clkin = pdata->clkin; + } st->min_out_freq = spi_get_device_id(spi)->driver_data == 4351 ? ADF4351_MIN_OUT_FREQ : ADF4350_MIN_OUT_FREQ; @@ -435,6 +470,8 @@ error_put_reg: if (!IS_ERR(st->reg)) regulator_put(st->reg); + if (clk) + clk_disable_unprepare(clk); iio_device_free(indio_dev); return ret; @@ -451,6 +488,9 @@ static int adf4350_remove(struct spi_device *spi) iio_device_unregister(indio_dev); + if (st->clk) + clk_disable_unprepare(st->clk); + if (!IS_ERR(reg)) { regulator_disable(reg); regulator_put(reg); @@ -481,6 +521,6 @@ static struct spi_driver adf4350_driver = { }; module_spi_driver(adf4350_driver); -MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); MODULE_DESCRIPTION("Analog Devices ADF4350/ADF4351 PLL"); MODULE_LICENSE("GPL v2"); |