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OpenCloudOS-Kernel/drivers/mfd/twl4030-madc.c

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mfd: Add twl4030 madc driver 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 cuurent etc. Signed-off-by: Keerthy <j-keerthy@ti.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2011-03-01 21:42:26 +08:00
/*
*
* TWL4030 MADC module driver-This driver monitors the real time
* conversion of analog signals like battery temperature,
* battery type, battery level etc.
*
* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
* J Keerthy <j-keerthy@ti.com>
*
* Based on twl4030-madc.c
* Copyright (C) 2008 Nokia Corporation
* Mikko Ylinen <mikko.k.ylinen@nokia.com>
*
* Amit Kucheria <amit.kucheria@canonical.com>
*
* 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/device.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/i2c/twl.h>
#include <linux/i2c/twl4030-madc.h>
#include <linux/module.h>
#include <linux/stddef.h>
#include <linux/mutex.h>
#include <linux/bitops.h>
#include <linux/jiffies.h>
#include <linux/types.h>
#include <linux/gfp.h>
#include <linux/err.h>
/*
* struct twl4030_madc_data - a container for madc info
* @dev - pointer to device structure for madc
* @lock - mutex protecting this data structure
* @requests - Array of request struct corresponding to SW1, SW2 and RT
* @imr - Interrupt mask register of MADC
* @isr - Interrupt status register of MADC
*/
struct twl4030_madc_data {
struct device *dev;
struct mutex lock; /* mutex protecting this data structure */
struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS];
int imr;
int isr;
};
static struct twl4030_madc_data *twl4030_madc;
struct twl4030_prescale_divider_ratios {
s16 numerator;
s16 denominator;
};
static const struct twl4030_prescale_divider_ratios
twl4030_divider_ratios[16] = {
{1, 1}, /* CHANNEL 0 No Prescaler */
{1, 1}, /* CHANNEL 1 No Prescaler */
{6, 10}, /* CHANNEL 2 */
{6, 10}, /* CHANNEL 3 */
{6, 10}, /* CHANNEL 4 */
{6, 10}, /* CHANNEL 5 */
{6, 10}, /* CHANNEL 6 */
{6, 10}, /* CHANNEL 7 */
{3, 14}, /* CHANNEL 8 */
{1, 3}, /* CHANNEL 9 */
{1, 1}, /* CHANNEL 10 No Prescaler */
{15, 100}, /* CHANNEL 11 */
{1, 4}, /* CHANNEL 12 */
{1, 1}, /* CHANNEL 13 Reserved channels */
{1, 1}, /* CHANNEL 14 Reseved channels */
{5, 11}, /* CHANNEL 15 */
};
/*
* Conversion table from -3 to 55 degree Celcius
*/
static int therm_tbl[] = {
30800, 29500, 28300, 27100,
26000, 24900, 23900, 22900, 22000, 21100, 20300, 19400, 18700, 17900,
17200, 16500, 15900, 15300, 14700, 14100, 13600, 13100, 12600, 12100,
11600, 11200, 10800, 10400, 10000, 9630, 9280, 8950, 8620, 8310,
8020, 7730, 7460, 7200, 6950, 6710, 6470, 6250, 6040, 5830,
5640, 5450, 5260, 5090, 4920, 4760, 4600, 4450, 4310, 4170,
4040, 3910, 3790, 3670, 3550
};
/*
* Structure containing the registers
* of different conversion methods supported by MADC.
* Hardware or RT real time conversion request initiated by external host
* processor for RT Signal conversions.
* External host processors can also request for non RT conversions
* SW1 and SW2 software conversions also called asynchronous or GPC request.
*/
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,
},
};
/*
* Function to read a particular channel value.
* @madc - pointer to struct twl4030_madc_data
* @reg - lsb of ADC Channel
* If the i2c read fails it returns an error else returns 0.
*/
static int twl4030_madc_channel_raw_read(struct twl4030_madc_data *madc, u8 reg)
{
u8 msb, lsb;
int ret;
/*
* For each ADC channel, we have MSB and LSB register pair. MSB address
* is always LSB address+1. reg parameter is the address of LSB register
*/
ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &msb, reg + 1);
if (ret) {
dev_err(madc->dev, "unable to read MSB register 0x%X\n",
reg + 1);
return ret;
}
ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &lsb, reg);
if (ret) {
dev_err(madc->dev, "unable to read LSB register 0x%X\n", reg);
return ret;
}
return (int)(((msb << 8) | lsb) >> 6);
}
/*
* Return battery temperature
* Or < 0 on failure.
*/
static int twl4030battery_temperature(int raw_volt)
{
u8 val;
int temp, curr, volt, res, ret;
volt = (raw_volt * TEMP_STEP_SIZE) / TEMP_PSR_R;
/* Getting and calculating the supply current in micro ampers */
ret = twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, &val,
REG_BCICTL2);
if (ret < 0)
return ret;
curr = ((val & TWL4030_BCI_ITHEN) + 1) * 10;
/* Getting and calculating the thermistor resistance in ohms */
res = volt * 1000 / curr;
/* calculating temperature */
for (temp = 58; temp >= 0; temp--) {
int actual = therm_tbl[temp];
if ((actual - res) >= 0)
break;
}
return temp + 1;
}
static int twl4030battery_current(int raw_volt)
{
int ret;
u8 val;
ret = twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, &val,
TWL4030_BCI_BCICTL1);
if (ret)
return ret;
if (val & TWL4030_BCI_CGAIN) /* slope of 0.44 mV/mA */
return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R1;
else /* slope of 0.88 mV/mA */
return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R2;
}
/*
* Function to read channel values
* @madc - pointer to twl4030_madc_data struct
* @reg_base - Base address of the first channel
* @Channels - 16 bit bitmap. If the bit is set, channel value is read
* @buf - The channel values are stored here. if read fails error
* value is stored
* Returns the number of successfully read channels.
*/
static int twl4030_madc_read_channels(struct twl4030_madc_data *madc,
u8 reg_base, unsigned
long channels, int *buf)
{
int count = 0, count_req = 0, i;
u8 reg;
for_each_set_bit(i, &channels, TWL4030_MADC_MAX_CHANNELS) {
reg = reg_base + 2 * i;
buf[i] = twl4030_madc_channel_raw_read(madc, reg);
if (buf[i] < 0) {
dev_err(madc->dev,
"Unable to read register 0x%X\n", reg);
count_req++;
continue;
}
switch (i) {
case 10:
buf[i] = twl4030battery_current(buf[i]);
if (buf[i] < 0) {
dev_err(madc->dev, "err reading current\n");
count_req++;
} else {
count++;
buf[i] = buf[i] - 750;
}
break;
case 1:
buf[i] = twl4030battery_temperature(buf[i]);
if (buf[i] < 0) {
dev_err(madc->dev, "err reading temperature\n");
count_req++;
} else {
buf[i] -= 3;
count++;
}
break;
default:
count++;
/* Analog Input (V) = conv_result * step_size / R
* conv_result = decimal value of 10-bit conversion
* result
* step size = 1.5 / (2 ^ 10 -1)
* R = Prescaler ratio for input channels.
* Result given in mV hence multiplied by 1000.
*/
buf[i] = (buf[i] * 3 * 1000 *
twl4030_divider_ratios[i].denominator)
/ (2 * 1023 *
twl4030_divider_ratios[i].numerator);
}
}
if (count_req)
dev_err(madc->dev, "%d channel conversion failed\n", count_req);
return count;
}
/*
* Enables irq.
* @madc - pointer to twl4030_madc_data struct
* @id - irq number to be enabled
* can take one of TWL4030_MADC_RT, TWL4030_MADC_SW1, TWL4030_MADC_SW2
* corresponding to RT, SW1, SW2 conversion requests.
* If the i2c read fails it returns an error else returns 0.
*/
static int twl4030_madc_enable_irq(struct twl4030_madc_data *madc, u8 id)
{
u8 val;
int ret;
ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &val, madc->imr);
if (ret) {
dev_err(madc->dev, "unable to read imr register 0x%X\n",
madc->imr);
return ret;
}
val &= ~(1 << id);
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, val, madc->imr);
if (ret) {
dev_err(madc->dev,
"unable to write imr register 0x%X\n", madc->imr);
return ret;
}
return 0;
}
/*
* Disables irq.
* @madc - pointer to twl4030_madc_data struct
* @id - irq number to be disabled
* can take one of TWL4030_MADC_RT, TWL4030_MADC_SW1, TWL4030_MADC_SW2
* corresponding to RT, SW1, SW2 conversion requests.
* Returns error if i2c read/write fails.
*/
static int twl4030_madc_disable_irq(struct twl4030_madc_data *madc, u8 id)
{
u8 val;
int ret;
ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &val, madc->imr);
if (ret) {
dev_err(madc->dev, "unable to read imr register 0x%X\n",
madc->imr);
return ret;
}
val |= (1 << id);
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, val, madc->imr);
if (ret) {
dev_err(madc->dev,
"unable to write imr register 0x%X\n", madc->imr);
return ret;
}
return 0;
}
static irqreturn_t twl4030_madc_threaded_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, ret;
struct twl4030_madc_request *r;
mutex_lock(&madc->lock);
ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &isr_val, madc->isr);
if (ret) {
dev_err(madc->dev, "unable to read isr register 0x%X\n",
madc->isr);
goto err_i2c;
}
ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &imr_val, madc->imr);
if (ret) {
dev_err(madc->dev, "unable to read imr register 0x%X\n",
madc->imr);
goto err_i2c;
}
isr_val &= ~imr_val;
for (i = 0; i < TWL4030_MADC_NUM_METHODS; i++) {
if (!(isr_val & (1 << i)))
continue;
ret = twl4030_madc_disable_irq(madc, i);
if (ret < 0)
dev_dbg(madc->dev, "Disable interrupt failed%d\n", i);
madc->requests[i].result_pending = 1;
}
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;
err_i2c:
/*
* In case of error check whichever request is active
* and service the same.
*/
for (i = 0; i < TWL4030_MADC_NUM_METHODS; i++) {
r = &madc->requests[i];
if (r->active == 0)
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;
int ret;
p = &madc->requests[req->method];
memcpy(p, req, sizeof(*req));
ret = twl4030_madc_enable_irq(madc, req->method);
if (ret < 0) {
dev_err(madc->dev, "enable irq failed!!\n");
return ret;
}
return 0;
}
/*
* Function which enables the madc conversion
* by writing to the control register.
* @madc - pointer to twl4030_madc_data struct
* @conv_method - can be TWL4030_MADC_RT, TWL4030_MADC_SW2, TWL4030_MADC_SW1
* corresponding to RT SW1 or SW2 conversion methods.
* Returns 0 if succeeds else a negative error value
*/
static int twl4030_madc_start_conversion(struct twl4030_madc_data *madc,
int conv_method)
{
const struct twl4030_madc_conversion_method *method;
int ret = 0;
method = &twl4030_conversion_methods[conv_method];
switch (conv_method) {
case TWL4030_MADC_SW1:
case TWL4030_MADC_SW2:
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC,
TWL4030_MADC_SW_START, method->ctrl);
if (ret) {
dev_err(madc->dev,
"unable to write ctrl register 0x%X\n",
method->ctrl);
return ret;
}
break;
default:
break;
}
return 0;
}
/*
* Function that waits for conversion to be ready
* @madc - pointer to twl4030_madc_data struct
* @timeout_ms - timeout value in milliseconds
* @status_reg - ctrl register
* returns 0 if succeeds else a negative error value
*/
static int twl4030_madc_wait_conversion_ready(struct twl4030_madc_data *madc,
unsigned int timeout_ms,
u8 status_reg)
{
unsigned long timeout;
int ret;
timeout = jiffies + msecs_to_jiffies(timeout_ms);
do {
u8 reg;
ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &reg, status_reg);
if (ret) {
dev_err(madc->dev,
"unable to read status register 0x%X\n",
status_reg);
return ret;
}
if (!(reg & TWL4030_MADC_BUSY) && (reg & TWL4030_MADC_EOC_SW))
return 0;
usleep_range(500, 2000);
} while (!time_after(jiffies, timeout));
dev_err(madc->dev, "conversion timeout!\n");
return -EAGAIN;
}
/*
* An exported function which can be called from other kernel drivers.
* @req twl4030_madc_request structure
* req->rbuf will be filled with read values of channels based on the
* channel index. If a particular channel reading fails there will
* be a negative error value in the corresponding array element.
* returns 0 if succeeds else error value
*/
int twl4030_madc_conversion(struct twl4030_madc_request *req)
{
const struct twl4030_madc_conversion_method *method;
u8 ch_msb, ch_lsb;
int ret;
if (!req)
return -EINVAL;
mutex_lock(&twl4030_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 (twl4030_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 */
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, ch_msb, method->sel + 1);
if (ret) {
dev_err(twl4030_madc->dev,
"unable to write sel register 0x%X\n", method->sel + 1);
return ret;
}
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, ch_lsb, method->sel);
if (ret) {
dev_err(twl4030_madc->dev,
"unable to write sel register 0x%X\n", method->sel + 1);
return ret;
}
/* Select averaging for all channels if do_avg is set */
if (req->do_avg) {
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC,
ch_msb, method->avg + 1);
if (ret) {
dev_err(twl4030_madc->dev,
"unable to write avg register 0x%X\n",
method->avg + 1);
return ret;
}
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC,
ch_lsb, method->avg);
if (ret) {
dev_err(twl4030_madc->dev,
"unable to write sel reg 0x%X\n",
method->sel + 1);
return ret;
}
}
if (req->type == TWL4030_MADC_IRQ_ONESHOT && req->func_cb != NULL) {
ret = twl4030_madc_set_irq(twl4030_madc, req);
if (ret < 0)
goto out;
ret = twl4030_madc_start_conversion(twl4030_madc, req->method);
if (ret < 0)
goto out;
twl4030_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;
}
ret = twl4030_madc_start_conversion(twl4030_madc, req->method);
if (ret < 0)
goto out;
twl4030_madc->requests[req->method].active = 1;
/* Wait until conversion is ready (ctrl register returns EOC) */
ret = twl4030_madc_wait_conversion_ready(twl4030_madc, 5, method->ctrl);
if (ret) {
twl4030_madc->requests[req->method].active = 0;
goto out;
}
ret = twl4030_madc_read_channels(twl4030_madc, method->rbase,
req->channels, req->rbuf);
twl4030_madc->requests[req->method].active = 0;
out:
mutex_unlock(&twl4030_madc->lock);
return ret;
}
EXPORT_SYMBOL_GPL(twl4030_madc_conversion);
/*
* Return channel value
* Or < 0 on failure.
*/
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_GPL(twl4030_get_madc_conversion);
/*
* Function to enable or disable bias current for
* main battery type reading or temperature sensing
* @madc - pointer to twl4030_madc_data struct
* @chan - can be one of the two values
* TWL4030_BCI_ITHEN - Enables bias current for main battery type reading
* TWL4030_BCI_TYPEN - Enables bias current for main battery temperature
* sensing
* @on - enable or disable chan.
*/
static int 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_err(madc->dev, "unable to read BCICTL1 reg 0x%X",
TWL4030_BCI_BCICTL1);
return ret;
}
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->dev, "unable to write BCICTL1 reg 0x%X\n",
TWL4030_BCI_BCICTL1);
return ret;
}
return 0;
}
/*
* Function that sets MADC software power on bit to enable MADC
* @madc - pointer to twl4030_madc_data struct
* @on - Enable or disable MADC software powen on bit.
* returns error if i2c read/write fails else 0
*/
static int twl4030_madc_set_power(struct twl4030_madc_data *madc, int on)
{
u8 regval;
int ret;
ret = twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE,
&regval, TWL4030_MADC_CTRL1);
if (ret) {
dev_err(madc->dev, "unable to read madc ctrl1 reg 0x%X\n",
TWL4030_MADC_CTRL1);
return ret;
}
if (on)
regval |= TWL4030_MADC_MADCON;
else
regval &= ~TWL4030_MADC_MADCON;
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, regval, TWL4030_MADC_CTRL1);
if (ret) {
dev_err(madc->dev, "unable to write madc ctrl1 reg 0x%X\n",
TWL4030_MADC_CTRL1);
return ret;
}
return 0;
}
/*
* Initialize MADC and request for threaded irq
*/
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;
u8 regval;
if (!pdata) {
dev_err(&pdev->dev, "platform_data not available\n");
return -EINVAL;
}
madc = kzalloc(sizeof(*madc), GFP_KERNEL);
if (!madc)
return -ENOMEM;
/*
* Phoenix provides 2 interrupt lines. The first one is connected to
* the OMAP. The other one can be connected to the other processor such
* as modem. Hence two separate ISR and IMR registers.
*/
madc->imr = (pdata->irq_line == 1) ?
TWL4030_MADC_IMR1 : TWL4030_MADC_IMR2;
madc->isr = (pdata->irq_line == 1) ?
TWL4030_MADC_ISR1 : TWL4030_MADC_ISR2;
ret = twl4030_madc_set_power(madc, 1);
if (ret < 0)
goto err_power;
ret = twl4030_madc_set_current_generator(madc, 0, 1);
if (ret < 0)
goto err_current_generator;
ret = twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE,
&regval, TWL4030_BCI_BCICTL1);
if (ret) {
dev_err(&pdev->dev, "unable to read reg BCI CTL1 0x%X\n",
TWL4030_BCI_BCICTL1);
goto err_i2c;
}
regval |= TWL4030_BCI_MESBAT;
ret = twl_i2c_write_u8(TWL4030_MODULE_MAIN_CHARGE,
regval, TWL4030_BCI_BCICTL1);
if (ret) {
dev_err(&pdev->dev, "unable to write reg BCI Ctl1 0x%X\n",
TWL4030_BCI_BCICTL1);
goto err_i2c;
}
platform_set_drvdata(pdev, madc);
mutex_init(&madc->lock);
ret = request_threaded_irq(platform_get_irq(pdev, 0), NULL,
twl4030_madc_threaded_irq_handler,
IRQF_TRIGGER_RISING, "twl4030_madc", madc);
if (ret) {
dev_dbg(&pdev->dev, "could not request irq\n");
goto err_irq;
}
twl4030_madc = madc;
return 0;
err_irq:
platform_set_drvdata(pdev, NULL);
err_i2c:
twl4030_madc_set_current_generator(madc, 0, 0);
err_current_generator:
twl4030_madc_set_power(madc, 0);
err_power:
kfree(madc);
return ret;
}
static int __devexit twl4030_madc_remove(struct platform_device *pdev)
{
struct twl4030_madc_data *madc = platform_get_drvdata(pdev);
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");
MODULE_ALIAS("twl4030_madc");