Re: [PATCH V2] hwmon: twl4030: Driver for twl4030 madc module

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On Tue, Nov 09, 2010 at 04:20:57AM -0500, Keerthy wrote:
> Introducing a driver for MADC on TWL4030 powerIC. MADC stands for monitoring
> ADC. This driver monitors the real time conversion of analog signals like
> battery temperature, battery type, battery level etc. User can also ask for
> the conversion on a particular channel using the sysfs nodes.
> 
> Signed-off-by: Keerthy <j-keerthy@xxxxxx>

Again, I am not sure if this driver belongs into hwmon, since it is not
really a hardware monitoring chip but a generic adc. We'll have to sort that out.

Code looks much better than before. Still not a complete review; you should
have a much closer look at error handling. I am sure I missed several cases
where error returns are ignored.

Thanks,
Guenter

> ---
> 
> Several people have contributed to this driver on the linux-omap list.
> 
> V2:
> 
> Error path correction in probe function.
> Return checks added.
> the_madc pointer could not be removed. The external drivers will not be knowing
> device information of the madc.
> Added another function which takes the channel number alone and returns
> the channel reading if the caller wants TWL4030_MADC_SW2 method for ADC conversion.
> IOCTL function is removed.
> Work struct is completely removed since request_threaded_irq is used.
> 
>  drivers/hwmon/Kconfig            |    6 +
>  drivers/hwmon/Makefile           |    1 +
>  drivers/hwmon/twl4030-madc.c     |  573 ++++++++++++++++++++++++++++++++++++++
>  include/linux/i2c/twl4030-madc.h |  118 ++++++++
>  4 files changed, 698 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/hwmon/twl4030-madc.c
>  create mode 100644 include/linux/i2c/twl4030-madc.h
> 
> V1:
> 
> http://www.mail-archive.com/linux-omap@xxxxxxxxxxxxxxx/msg34947.html
> 
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index a56f6ad..fef75f2 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1171,6 +1171,12 @@ config SENSORS_MC13783_ADC
>          help
>            Support for the A/D converter on MC13783 PMIC.
> 
> +config SENSORS_TWL4030_MADC
> +       tristate
> +       depends on TWL4030_CORE
> +       help
> +         This driver provides support for TWL4030-MADC.
> +

Besides adding a description, you might alwo want to move this to the other 
TI chips.

>  if ACPI
> 
>  comment "ACPI drivers"
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index 2479b3d..a54af22 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -100,6 +100,7 @@ obj-$(CONFIG_SENSORS_THMC50)        += thmc50.o
>  obj-$(CONFIG_SENSORS_TMP102)   += tmp102.o
>  obj-$(CONFIG_SENSORS_TMP401)   += tmp401.o
>  obj-$(CONFIG_SENSORS_TMP421)   += tmp421.o
> +obj-$(CONFIG_SENSORS_TWL4030_MADC)+= twl4030-madc.o
>  obj-$(CONFIG_SENSORS_VIA_CPUTEMP)+= via-cputemp.o
>  obj-$(CONFIG_SENSORS_VIA686A)  += via686a.o
>  obj-$(CONFIG_SENSORS_VT1211)   += vt1211.o
> diff --git a/drivers/hwmon/twl4030-madc.c b/drivers/hwmon/twl4030-madc.c
> new file mode 100644
> index 0000000..42f7d4a
> --- /dev/null
> +++ b/drivers/hwmon/twl4030-madc.c
> @@ -0,0 +1,573 @@
> +/*
> + *
> + * TWL4030 MADC module driver-This driver monitors the real time
> + * conversion of analog signals like battery temperature,
> + * battery type, battery level etc. User can also ask for the conversion on a
> + * particular channel using the sysfs nodes.
> + *
> + * Copyright (C) 2010 Texas Instruments Inc.
> + * J Keerthy <j-keerthy@xxxxxx>
> + *
> + * Based on twl4030-madc.c
> + * Copyright (C) 2008 Nokia Corporation
> + * Mikko Ylinen <mikko.k.ylinen@xxxxxxxxx>
> + *
> + * Amit Kucheria <amit.kucheria@xxxxxxxxxxxxx>
> + *
> + * 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.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + *
> + */
> +
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/types.h>
> +#include <linux/module.h>
> +#include <linux/delay.h>
> +#include <linux/fs.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/i2c/twl.h>
> +#include <linux/i2c/twl4030-madc.h>
> +#include <linux/sysfs.h>
> +#include <linux/hwmon.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/uaccess.h>
> +
> +struct twl4030_madc_data {
> +       struct device *hwmon_dev;
> +       struct mutex lock;
> +       struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS];
> +       int imr;
> +       int isr;
> +};
> +
> +static struct twl4030_madc_data *the_madc;
> +
> +static ssize_t madc_read(struct device *dev,
> +                        struct device_attribute *devattr, char *buf)
> +{
> +       struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +       struct twl4030_madc_request req;
> +       int status;
> +       long val;
> +
> +       req.channels = (1 << attr->index);
> +       req.method = TWL4030_MADC_SW2;
> +       req.func_cb = NULL;
> +
> +       val = twl4030_madc_conversion(&req);
> +       if (likely(val >= 0))
> +               val = req.rbuf[attr->index];
> +       else
> +               return val;
> +       status = sprintf(buf, "%ld\n", val);
> +       return status;


	if (unlikely(val < 0))
		return val;

	return sprintf(buf, "%ld\n", req.rbuf[attr->index]);

should do and would be simpler. status is not needed at all.

> +}
> +
> +static
> +const struct twl4030_madc_conversion_method twl4030_conversion_methods[] = {
> +       [TWL4030_MADC_RT] = {
> +                            .sel = TWL4030_MADC_RTSELECT_LSB,
> +                            .avg = TWL4030_MADC_RTAVERAGE_LSB,
> +                            .rbase = TWL4030_MADC_RTCH0_LSB,
> +                            },
> +       [TWL4030_MADC_SW1] = {
> +                             .sel = TWL4030_MADC_SW1SELECT_LSB,
> +                             .avg = TWL4030_MADC_SW1AVERAGE_LSB,
> +                             .rbase = TWL4030_MADC_GPCH0_LSB,
> +                             .ctrl = TWL4030_MADC_CTRL_SW1,
> +                             },
> +       [TWL4030_MADC_SW2] = {
> +                             .sel = TWL4030_MADC_SW2SELECT_LSB,
> +                             .avg = TWL4030_MADC_SW2AVERAGE_LSB,
> +                             .rbase = TWL4030_MADC_GPCH0_LSB,
> +                             .ctrl = TWL4030_MADC_CTRL_SW2,
> +                             },
> +};
> +
> +static int twl4030_madc_read(struct twl4030_madc_data *madc, u8 reg)
> +{
> +       int ret;
> +       u8 val;
> +
> +       ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &val, reg);
> +       if (ret) {
> +               dev_dbg(madc->hwmon_dev, "unable to read register 0x%X\n", reg);
> +               return ret;
> +       }
> +
> +       return val;
> +}
> +
> +static void twl4030_madc_write(struct twl4030_madc_data *madc, u8 reg, u8 val)
> +{
> +       int ret;
> +
> +       ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, val, reg);
> +       if (ret)
> +               dev_err(madc->hwmon_dev,
> +                       "unable to write register 0x%X\n", reg);
> +}

Looking into other uses of twl_i2c_write_u8(), most check and return errors.
Not sure if it is a good idea to ignore all errors as it is done here. There 
should at least some comment explaining that and why it is done.

> +
> +static int twl4030_madc_channel_raw_read(struct twl4030_madc_data *madc, u8 reg)
> +{
> +       u8 msb, lsb;
> +
> +       /*
> +        * For each ADC channel, we have MSB and LSB register pair. MSB address
> +        * is always LSB address+1. reg parameter is the addr of LSB register
> +        */
> +       msb = twl4030_madc_read(madc, reg + 1);
> +       lsb = twl4030_madc_read(madc, reg);
> +
Ignoring returned errors and combining them into a random value doesn't make much sense.

> +       return (int)(((msb << 8) | lsb) >> 6);
> +}
> +
> +static int twl4030_madc_read_channels(struct twl4030_madc_data *madc,
> +                                     u8 reg_base, u16 channels, int *buf)
> +{
> +       int count = 0;
> +       u8 reg, i;
> +
> +       if (unlikely(!buf))
> +               return 0;
> +
I don't see how this can ever be NULL.

> +       for (i = 0; i < TWL4030_MADC_MAX_CHANNELS; i++) {
> +               if (channels & (1 << i)) {
> +                       reg = reg_base + 2 * i;
> +                       buf[i] = twl4030_madc_channel_raw_read(madc, reg);

Content of buf will be more or less random after errors.

> +                       count++;
> +               }
> +       }
> +       return count;
> +}
> +
> +static void twl4030_madc_enable_irq(struct twl4030_madc_data *madc, int id)
> +{
> +       u8 val;
> +
> +       val = twl4030_madc_read(madc, madc->imr);

What if twl4030_madc_read() returned an error ? Try to write a random value ?

> +       val &= ~(1 << id);
> +       twl4030_madc_write(madc, madc->imr, val);
> +}
> +
> +static void twl4030_madc_disable_irq(struct twl4030_madc_data *madc, int id)
> +{
> +       u8 val;
> +
> +       val = twl4030_madc_read(madc, madc->imr);

Returned error ignored.

> +       val |= (1 << id);
> +       twl4030_madc_write(madc, madc->imr, val);
> +}
> +
> +static irqreturn_t twl4030_madc_irq_handler(int irq, void *_madc)
> +{
> +       struct twl4030_madc_data *madc = _madc;
> +       const struct twl4030_madc_conversion_method *method;
> +       u8 isr_val, imr_val;
> +       int i, len;
> +       struct twl4030_madc_request *r;
> +
> +       isr_val = twl4030_madc_read(madc, madc->isr);
> +       imr_val = twl4030_madc_read(madc, madc->imr);
> +
Returned errors ignored.

> +       isr_val &= ~imr_val;
> +
> +       for (i = 0; i < TWL4030_MADC_NUM_METHODS; i++) {
> +
> +               if (!(isr_val & (1 << i)))
> +                       continue;
> +
> +               twl4030_madc_disable_irq(madc, i);
> +               madc->requests[i].result_pending = 1;
> +       }
> +       mutex_lock(&madc->lock);
> +       for (i = 0; i < TWL4030_MADC_NUM_METHODS; i++) {
> +
> +               r = &madc->requests[i];
> +
> +               /* No pending results for this method, move to next one */
> +               if (!r->result_pending)
> +                       continue;
> +
> +               method = &twl4030_conversion_methods[r->method];
> +
> +               /* Read results */
> +               len = twl4030_madc_read_channels(madc, method->rbase,
> +                                                r->channels, r->rbuf);
> +               /* Return results to caller */
> +               if (r->func_cb != NULL) {
> +                       r->func_cb(len, r->channels, r->rbuf);
> +                       r->func_cb = NULL;
> +               }
> +
> +               /* Free request */
> +               r->result_pending = 0;
> +               r->active = 0;
> +       }
> +
> +       mutex_unlock(&madc->lock);
> +
> +       return IRQ_HANDLED;
> +}
> +
> +static int twl4030_madc_set_irq(struct twl4030_madc_data *madc,
> +                               struct twl4030_madc_request *req)
> +{
> +       struct twl4030_madc_request *p;
> +
> +       p = &madc->requests[req->method];
> +
> +       memcpy(p, req, sizeof *req);
> +
> +       twl4030_madc_enable_irq(madc, req->method);
> +
> +       return 0;
> +}
> +
> +static inline void twl4030_madc_start_conversion(struct twl4030_madc_data *madc,
> +                                                int conv_method)
> +{
> +       const struct twl4030_madc_conversion_method *method;
> +
> +       method = &twl4030_conversion_methods[conv_method];
> +
> +       switch (conv_method) {
> +       case TWL4030_MADC_SW1:
> +       case TWL4030_MADC_SW2:
> +               twl4030_madc_write(madc, method->ctrl, TWL4030_MADC_SW_START);
> +               break;
> +       case TWL4030_MADC_RT:
> +       default:
> +               break;
> +       }
> +}
> +
> +static int twl4030_madc_wait_conversion_ready(struct twl4030_madc_data *madc,
> +                                             unsigned int timeout_ms,
> +                                             u8 status_reg)
> +{
> +       unsigned long timeout;
> +
> +       timeout = jiffies + msecs_to_jiffies(timeout_ms);
> +       do {
> +               u8 reg;
> +
> +               reg = twl4030_madc_read(madc, status_reg);

Returned error ignored.

> +               if (!(reg & TWL4030_MADC_BUSY) && (reg & TWL4030_MADC_EOC_SW))
> +                       return 0;
> +       } while (!time_after(jiffies, timeout));
> +
> +       return -EAGAIN;
> +}
> +
> +int twl4030_madc_conversion(struct twl4030_madc_request *req)
> +{
> +       const struct twl4030_madc_conversion_method *method;
> +       u8 ch_msb, ch_lsb;
> +       int ret;
> +
> +       if (unlikely(!req))
> +               return -EINVAL;
> +
> +       mutex_lock(&the_madc->lock);
> +
> +       if (req->method < TWL4030_MADC_RT || req->method > TWL4030_MADC_SW2) {
> +               ret = -EINVAL;
> +               goto out;
> +       }
> +
> +       /* Do we have a conversion request ongoing */
> +       if (the_madc->requests[req->method].active) {
> +               ret = -EBUSY;
> +               goto out;
> +       }
> +
> +       ch_msb = (req->channels >> 8) & 0xff;
> +       ch_lsb = req->channels & 0xff;
> +
> +       method = &twl4030_conversion_methods[req->method];
> +
> +       /* Select channels to be converted */
> +       twl4030_madc_write(the_madc, method->sel + 1, ch_msb);
> +       twl4030_madc_write(the_madc, method->sel, ch_lsb);
> +
> +       /* Select averaging for all channels if do_avg is set */
> +       if (req->do_avg) {
> +               twl4030_madc_write(the_madc, method->avg + 1, ch_msb);
> +               twl4030_madc_write(the_madc, method->avg, ch_lsb);
> +       }
> +
> +       if (req->type == TWL4030_MADC_IRQ_ONESHOT && req->func_cb != NULL) {
> +               twl4030_madc_set_irq(the_madc, req);
> +               twl4030_madc_start_conversion(the_madc, req->method);
> +               the_madc->requests[req->method].active = 1;
> +               ret = 0;
> +               goto out;
> +       }
> +
> +       /* With RT method we should not be here anymore */
> +       if (req->method == TWL4030_MADC_RT) {
> +               ret = -EINVAL;
> +               goto out;
> +       }
> +
> +       twl4030_madc_start_conversion(the_madc, req->method);
> +       the_madc->requests[req->method].active = 1;
> +
> +       /* Wait until conversion is ready (ctrl register returns EOC) */
> +       ret = twl4030_madc_wait_conversion_ready(the_madc, 5, method->ctrl);
> +       if (ret) {
> +               dev_dbg(the_madc->hwmon_dev, "conversion timeout!\n");
> +               the_madc->requests[req->method].active = 0;
> +               goto out;
> +       }
> +
> +       ret = twl4030_madc_read_channels(the_madc, method->rbase, req->channels,
> +                                        req->rbuf);
> +
> +       the_madc->requests[req->method].active = 0;
> +
> +out:
> +       mutex_unlock(&the_madc->lock);
> +
> +       return ret;
> +}
> +EXPORT_SYMBOL(twl4030_madc_conversion);
> +
> +/*
> + * Return channel value
> + * Or < 0 on failure.
> + */
> +static int twl4030_get_madc_conversion(int channel_no)
> +{
> +       struct twl4030_madc_request req;
> +       int temp = 0;
> +       int ret;
> +
> +       req.channels = (1 << channel_no);
> +       req.method = TWL4030_MADC_SW2;
> +       req.active = 0;
> +       req.func_cb = NULL;
> +       ret = twl4030_madc_conversion(&req);
> +       if (ret < 0)
> +               return ret;
> +
> +       if (req.rbuf[channel_no] > 0)
> +               temp = req.rbuf[channel_no];
> +
> +       return temp;
> +}
> +EXPORT_SYMBOL(twl4030_get_madc_conversion);
> +

EXPORT_SYMBOL and static declaration is a contradiction.
Actually, this function is not used anywhere. Does this compile without warning ?

> +static void twl4030_madc_set_current_generator(struct twl4030_madc_data *madc,
> +                                              int chan, int on)
> +{
> +       int ret;
> +       u8 regval;
> +
> +       ret = twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE,
> +                             &regval, TWL4030_BCI_BCICTL1);
> +       if (ret) {
> +               dev_dbg(madc->hwmon_dev,
> +                       "unable to read register 0x%X\n", TWL4030_BCI_BCICTL1);
> +       }
You detect the error ... then go ahead and use the random regval anyway. 

> +       if (on)
> +               regval |= chan ? TWL4030_BCI_ITHEN : TWL4030_BCI_TYPEN;
> +       else
> +               regval &= chan ? ~TWL4030_BCI_ITHEN : ~TWL4030_BCI_TYPEN;
> +       ret = twl_i2c_write_u8(TWL4030_MODULE_MAIN_CHARGE,
> +                              regval, TWL4030_BCI_BCICTL1);
> +       if (ret)
> +               dev_err(madc->hwmon_dev,
> +                       "unable to write register 0x%X\n", TWL4030_BCI_BCICTL1);
> +
Unnecessary blank line.

> +}
> +
> +static void twl4030_madc_set_power(struct twl4030_madc_data *madc, int on)
> +{
> +       u8 regval;
> +
> +       regval = twl4030_madc_read(madc, TWL4030_MADC_CTRL1);

Returned error ignored.

> +       if (on)
> +               regval |= TWL4030_MADC_MADCON;
> +       else
> +               regval &= ~TWL4030_MADC_MADCON;
> +       twl4030_madc_write(madc, TWL4030_MADC_CTRL1, regval);
> +}
> +
> +static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, madc_read, NULL, 0);
> +static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, madc_read, NULL, 1);
> +static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, madc_read, NULL, 2);
> +static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, madc_read, NULL, 3);
> +static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, madc_read, NULL, 4);
> +static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, madc_read, NULL, 5);
> +static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, madc_read, NULL, 6);
> +static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, madc_read, NULL, 7);
> +static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, madc_read, NULL, 8);
> +static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, madc_read, NULL, 9);
> +static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, madc_read, NULL, 10);
> +static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, madc_read, NULL, 11);
> +static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, madc_read, NULL, 12);
> +static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, madc_read, NULL, 13);
> +static SENSOR_DEVICE_ATTR(in14_input, S_IRUGO, madc_read, NULL, 14);
> +static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, madc_read, NULL, 15);
> +
> +static struct attribute *twl4030_madc_attributes[] = {
> +       &sensor_dev_attr_in0_input.dev_attr.attr,
> +       &sensor_dev_attr_in1_input.dev_attr.attr,
> +       &sensor_dev_attr_in2_input.dev_attr.attr,
> +       &sensor_dev_attr_in3_input.dev_attr.attr,
> +       &sensor_dev_attr_in4_input.dev_attr.attr,
> +       &sensor_dev_attr_in5_input.dev_attr.attr,
> +       &sensor_dev_attr_in6_input.dev_attr.attr,
> +       &sensor_dev_attr_in7_input.dev_attr.attr,
> +       &sensor_dev_attr_in8_input.dev_attr.attr,
> +       &sensor_dev_attr_in9_input.dev_attr.attr,
> +       &sensor_dev_attr_in10_input.dev_attr.attr,
> +       &sensor_dev_attr_in11_input.dev_attr.attr,
> +       &sensor_dev_attr_in12_input.dev_attr.attr,
> +       &sensor_dev_attr_in13_input.dev_attr.attr,
> +       &sensor_dev_attr_in14_input.dev_attr.attr,
> +       &sensor_dev_attr_in15_input.dev_attr.attr,
> +       NULL
> +};
> +
> +static const struct attribute_group twl4030_madc_group = {
> +       .attrs = twl4030_madc_attributes,
> +};
> +
> +static int __devinit twl4030_madc_probe(struct platform_device *pdev)
> +{
> +       struct twl4030_madc_data *madc;
> +       struct twl4030_madc_platform_data *pdata = pdev->dev.platform_data;
> +       int ret;
> +       int status;
> +       u8 regval;
> +
> +       madc = kzalloc(sizeof *madc, GFP_KERNEL);
> +       if (!madc)
> +               return -ENOMEM;
> +
> +       if (!pdata) {
> +               dev_dbg(&pdev->dev, "platform_data not available\n");
> +               ret = -EINVAL;
> +               goto err_misc;
> +       }
You can check that before allocating memory.

> +       madc->imr = (pdata->irq_line == 1) ?
> +           TWL4030_MADC_IMR1 : TWL4030_MADC_IMR2;
> +       madc->isr = (pdata->irq_line == 1) ?
> +           TWL4030_MADC_ISR1 : TWL4030_MADC_ISR2;
> +       twl4030_madc_set_power(madc, 1);
> +
> +       twl4030_madc_set_current_generator(madc, 0, 1);
> +
> +       ret = twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE,
> +                             &regval, TWL4030_BCI_BCICTL1);
> +       if (ret) {
> +               dev_err(&pdev->dev,
> +                       "unable to read register 0x%X\n", TWL4030_BCI_BCICTL1);

No action ?

> +       }
> +       regval |= TWL4030_BCI_MESBAT;
> +
If the read failed above, you are going to write random data.
Not sure if that makes sense.

> +       ret = twl_i2c_write_u8(TWL4030_MODULE_MAIN_CHARGE,
> +                              regval, TWL4030_BCI_BCICTL1);
> +       if (ret) {
> +               dev_err(&pdev->dev,
> +                       "unable to write register 0x%X\n", TWL4030_BCI_BCICTL1);

No action ?

It might make sense to bail out if register read/writes fail.

> +       }
> +
> +       platform_set_drvdata(pdev, madc);
> +       mutex_init(&madc->lock);
> +
> +       ret = request_threaded_irq(platform_get_irq(pdev, 0), NULL,
> +                                  twl4030_madc_irq_handler,
> +                                  IRQF_TRIGGER_RISING, "twl4030_madc", madc);
> +       if (ret) {
> +               dev_dbg(&pdev->dev, "could not request irq\n");
> +               goto err_irq;

Jump to release irq for which the request failed.

> +       }
> +
> +       ret = sysfs_create_group(&pdev->dev.kobj, &twl4030_madc_group);
> +       if (ret)
> +               goto err_sysfs;

Jump to remove group which wasn't added.

> +
> +       madc->hwmon_dev = hwmon_device_register(&pdev->dev);
> +       if (IS_ERR(madc->hwmon_dev)) {
> +               dev_err(&pdev->dev, "hwmon_device_register failed.\n");
> +               status = PTR_ERR(madc->hwmon_dev);
> +               goto err_reg;

This jumps to err_reg where you try to unregister the device for which registration failed.

> +       }
> +
> +       the_madc = madc;
> +       return 0;
> +
> +err_reg:
> +       hwmon_device_unregister(&pdev->dev);
> +err_sysfs:
> +       sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group);
> +err_irq:
> +       free_irq(platform_get_irq(pdev, 0), madc);
> +       platform_set_drvdata(pdev, NULL);
> +       twl4030_madc_set_power(madc, 0);
> +       twl4030_madc_set_current_generator(madc, 0, 0);
> +err_misc:
> +       kfree(madc);
> +
> +       return ret;
> +}
> +
> +static int __devexit twl4030_madc_remove(struct platform_device *pdev)
> +{
> +       struct twl4030_madc_data *madc = platform_get_drvdata(pdev);
> +
> +       hwmon_device_unregister(&pdev->dev);
> +       sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group);
> +       free_irq(platform_get_irq(pdev, 0), madc);
> +       platform_set_drvdata(pdev, NULL);
> +       twl4030_madc_set_current_generator(madc, 0, 0);
> +       twl4030_madc_set_power(madc, 0);
> +       kfree(madc);
> +
> +       return 0;
> +}
> +
> +static struct platform_driver twl4030_madc_driver = {
> +       .probe = twl4030_madc_probe,
> +       .remove = __exit_p(twl4030_madc_remove),
> +       .driver = {
> +                  .name = "twl4030_madc",
> +                  .owner = THIS_MODULE,
> +                  },
> +};
> +
> +static int __init twl4030_madc_init(void)
> +{
> +       return platform_driver_register(&twl4030_madc_driver);
> +}
> +
> +module_init(twl4030_madc_init);
> +
> +static void __exit twl4030_madc_exit(void)
> +{
> +       platform_driver_unregister(&twl4030_madc_driver);
> +}
> +
> +module_exit(twl4030_madc_exit);
> +
> +MODULE_DESCRIPTION("TWL4030 ADC driver");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("J Keerthy");
> diff --git a/include/linux/i2c/twl4030-madc.h b/include/linux/i2c/twl4030-madc.h
> new file mode 100644
> index 0000000..0e4e227
> --- /dev/null
> +++ b/include/linux/i2c/twl4030-madc.h
> @@ -0,0 +1,118 @@
> +/*
> + * 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.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + *
> + */
> +
> +#ifndef _TWL4030_MADC_H
> +#define _TWL4030_MADC_H
> +
> +struct twl4030_madc_conversion_method {
> +       u8 sel;
> +       u8 avg;
> +       u8 rbase;
> +       u8 ctrl;
> +};
> +
> +#define TWL4030_MADC_MAX_CHANNELS 16
> +
> +struct twl4030_madc_request {
> +       u16 channels;
> +       u16 do_avg;
> +       u16 method;
> +       u16 type;
> +       bool active;
> +       bool result_pending;
> +       int rbuf[TWL4030_MADC_MAX_CHANNELS];
> +       void (*func_cb)(int len, int channels, int *buf);
> +};
> +
> +enum conversion_methods {
> +       TWL4030_MADC_RT,
> +       TWL4030_MADC_SW1,
> +       TWL4030_MADC_SW2,
> +       TWL4030_MADC_NUM_METHODS
> +};
> +
> +enum sample_type {
> +       TWL4030_MADC_WAIT,
> +       TWL4030_MADC_IRQ_ONESHOT,
> +       TWL4030_MADC_IRQ_REARM
> +};
> +
> +#define TWL4030_MADC_CTRL1             0x00
> +#define TWL4030_MADC_CTRL2             0x01
> +
> +#define TWL4030_MADC_RTSELECT_LSB      0x02
> +#define TWL4030_MADC_SW1SELECT_LSB     0x06
> +#define TWL4030_MADC_SW2SELECT_LSB     0x0A
> +
> +#define TWL4030_MADC_RTAVERAGE_LSB     0x04
> +#define TWL4030_MADC_SW1AVERAGE_LSB    0x08
> +#define TWL4030_MADC_SW2AVERAGE_LSB    0x0C
> +
> +#define TWL4030_MADC_CTRL_SW1          0x12
> +#define TWL4030_MADC_CTRL_SW2          0x13
> +
> +#define TWL4030_MADC_RTCH0_LSB         0x17
> +#define TWL4030_MADC_GPCH0_LSB         0x37
> +
> +#define TWL4030_MADC_MADCON            (1 << 0)        /* MADC power on */
> +#define TWL4030_MADC_BUSY              (1 << 0)        /* MADC busy */
> +#define TWL4030_MADC_EOC_SW            (1 << 1)        /* MADC conversion completion */
> +#define TWL4030_MADC_SW_START          (1 << 5)  /* MADC SWx start conversion */
> +
Formatting looks off here, and I am sure lines are > 80 columns.

> +#define        TWL4030_MADC_ADCIN0             (1 << 0)
> +#define        TWL4030_MADC_ADCIN1             (1 << 1)
> +#define        TWL4030_MADC_ADCIN2             (1 << 2)
> +#define        TWL4030_MADC_ADCIN3             (1 << 3)
> +#define        TWL4030_MADC_ADCIN4             (1 << 4)
> +#define        TWL4030_MADC_ADCIN5             (1 << 5)
> +#define        TWL4030_MADC_ADCIN6             (1 << 6)
> +#define        TWL4030_MADC_ADCIN7             (1 << 7)
> +#define        TWL4030_MADC_ADCIN8             (1 << 8)
> +#define        TWL4030_MADC_ADCIN9             (1 << 9)
> +#define        TWL4030_MADC_ADCIN10            (1 << 10)
> +#define        TWL4030_MADC_ADCIN11            (1 << 11)
> +#define        TWL4030_MADC_ADCIN12            (1 << 12)
> +#define        TWL4030_MADC_ADCIN13            (1 << 13)
> +#define        TWL4030_MADC_ADCIN14            (1 << 14)
> +#define        TWL4030_MADC_ADCIN15            (1 << 15)
> +
Please no tabs after #define.

> +/* Fixed channels */
> +#define TWL4030_MADC_BTEMP             TWL4030_MADC_ADCIN1
> +#define TWL4030_MADC_VBUS              TWL4030_MADC_ADCIN8
> +#define TWL4030_MADC_VBKB              TWL4030_MADC_ADCIN9
> +#define        TWL4030_MADC_ICHG               TWL4030_MADC_ADCIN10
> +#define TWL4030_MADC_VCHG              TWL4030_MADC_ADCIN11
> +#define        TWL4030_MADC_VBAT               TWL4030_MADC_ADCIN12
> +
> +#define TWL4030_BCI_BCICTL1            0x23
> +#define        TWL4030_BCI_MESBAT              (1 << 1)
> +#define        TWL4030_BCI_TYPEN               (1 << 4)
> +#define        TWL4030_BCI_ITHEN               (1 << 3)
> +
> +#define TWL4030_MADC_IOC_MAGIC '`'
> +#define TWL4030_MADC_IOCX_ADC_RAW_READ         _IO(TWL4030_MADC_IOC_MAGIC, 0)
> +
> +struct twl4030_madc_user_parms {
> +       int channel;
> +       int average;
> +       int status;
> +       u16 result;
> +};
> +
> +int twl4030_madc_conversion(struct twl4030_madc_request *conv);
> +
> +#endif
> --
> 1.7.0.4
> 
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