i2c: constify internal structures

Check for i2c_algorithm and i2c_adapter_quirks structures that are only
stored in the algo and quirks fields of an i2c_adapter structure
correspondingly. These fields are declared const, so i2c_algorithm and
i2c_adapter_quirks structures that have this property can be declared
as const also.

Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> (for designware)
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-davinci.c

@@ -733,7 +733,7 @@ static inline void i2c_davinci_cpufreq_deregister(struct davinci_i2c_dev *dev)
 }
 #endif
 
-static struct i2c_algorithm i2c_davinci_algo = {
+static const struct i2c_algorithm i2c_davinci_algo = {
 	.master_xfer	= i2c_davinci_xfer,
 	.functionality	= i2c_davinci_func,
 };

drivers/i2c/busses/i2c-designware-slave.c

@@ -343,7 +343,7 @@ static irqreturn_t i2c_dw_isr_slave(int this_irq, void *dev_id)
 	return IRQ_RETVAL(ret);
 }
 
-static struct i2c_algorithm i2c_dw_algo = {
+static const struct i2c_algorithm i2c_dw_algo = {
 	.functionality = i2c_dw_func,
 	.reg_slave = i2c_dw_reg_slave,
 	.unreg_slave = i2c_dw_unreg_slave,

drivers/i2c/busses/i2c-pmcmsp.c

@@ -577,7 +577,7 @@ static u32 pmcmsptwi_i2c_func(struct i2c_adapter *adapter)
 		I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_PROC_CALL;
 }
 
-static struct i2c_adapter_quirks pmcmsptwi_i2c_quirks = {
+static const struct i2c_adapter_quirks pmcmsptwi_i2c_quirks = {
 	.flags = I2C_AQ_COMB_WRITE_THEN_READ,
 	.max_write_len = MSP_MAX_BYTES_PER_RW,
 	.max_read_len = MSP_MAX_BYTES_PER_RW,
@@ -587,7 +587,7 @@ static struct i2c_adapter_quirks pmcmsptwi_i2c_quirks = {
 
 /* -- Initialization -- */
 
-static struct i2c_algorithm pmcmsptwi_algo = {
+static const struct i2c_algorithm pmcmsptwi_algo = {
 	.master_xfer	= pmcmsptwi_master_xfer,
 	.functionality	= pmcmsptwi_i2c_func,
 };

drivers/i2c/busses/i2c-stm32f4.c

@@ -751,7 +751,7 @@ static u32 stm32f4_i2c_func(struct i2c_adapter *adap)
 	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 }
 
-static struct i2c_algorithm stm32f4_i2c_algo = {
+static const struct i2c_algorithm stm32f4_i2c_algo = {
 	.master_xfer = stm32f4_i2c_xfer,
 	.functionality = stm32f4_i2c_func,
 };