From: Uwe Hermann <redacted>
Date: Fri, 20 Mar 2015 13:48:20 +0000 (+0100)
Subject: Constify a few arrays and variables.
X-Git-Tag: libsigrok-0.4.0~576
X-Git-Url: https://sigrok.org/gitweb/?p=libsigrok.git;a=commitdiff_plain;h=329733d92c5004f0fe308eff26b9537fded2cdf3

Constify a few arrays and variables.
---

diff --git a/src/hardware/atten-pps3xxx/api.c b/src/hardware/atten-pps3xxx/api.c
index ceae0274..8cce8401 100644
--- a/src/hardware/atten-pps3xxx/api.c
+++ b/src/hardware/atten-pps3xxx/api.c
@@ -60,7 +60,7 @@ static const char *channel_modes[] = {
 	"Parallel",
 };
 
-static struct pps_model models[] = {
+static const struct pps_model models[] = {
 	{ PPS_3203T_3S, "PPS3203T-3S",
 		CHANMODE_INDEPENDENT | CHANMODE_SERIES | CHANMODE_PARALLEL,
 		3,
@@ -92,7 +92,7 @@ static GSList *scan(struct sr_dev_driver *di, GSList *options, int modelid)
 	struct sr_channel_group *cg;
 	struct sr_serial_dev_inst *serial;
 	GSList *l, *devices;
-	struct pps_model *model;
+	const struct pps_model *model;
 	uint8_t packet[PACKET_SIZE];
 	unsigned int i;
 	int delay_ms, ret;
diff --git a/src/hardware/atten-pps3xxx/protocol.h b/src/hardware/atten-pps3xxx/protocol.h
index 36ee281a..01983d3b 100644
--- a/src/hardware/atten-pps3xxx/protocol.h
+++ b/src/hardware/atten-pps3xxx/protocol.h
@@ -74,7 +74,7 @@ struct per_channel_config {
 /** Private, per-device-instance driver context. */
 struct dev_context {
 	/* Model-specific information */
-	struct pps_model *model;
+	const struct pps_model *model;
 
 	/* Acquisition state */
 	gboolean acquisition_running;
diff --git a/src/hardware/brymen-bm86x/protocol.c b/src/hardware/brymen-bm86x/protocol.c
index d300149d..4de8a74c 100644
--- a/src/hardware/brymen-bm86x/protocol.c
+++ b/src/hardware/brymen-bm86x/protocol.c
@@ -23,7 +23,7 @@
 
 #define USB_TIMEOUT 500
 
-static char char_map[128] = {
+static const char char_map[128] = {
 	[0x20] = '-',
 	[0x5F] = '0',
 	[0x50] = '1',
diff --git a/src/hardware/cem-dt-885x/protocol.c b/src/hardware/cem-dt-885x/protocol.c
index bbb1a03a..00dbd0c4 100644
--- a/src/hardware/cem-dt-885x/protocol.c
+++ b/src/hardware/cem-dt-885x/protocol.c
@@ -21,7 +21,7 @@
 #include "protocol.h"
 
 /* Length of expected payload for each token. */
-static int token_payloads[][2] = {
+static const int token_payloads[][2] = {
 	{ TOKEN_WEIGHT_TIME_FAST, 0 },
 	{ TOKEN_WEIGHT_TIME_SLOW, 0 },
 	{ TOKEN_HOLD_MAX, 0 },
diff --git a/src/hardware/chronovu-la/api.c b/src/hardware/chronovu-la/api.c
index 7d4aae04..379b0a4a 100644
--- a/src/hardware/chronovu-la/api.c
+++ b/src/hardware/chronovu-la/api.c
@@ -39,7 +39,7 @@ static const int32_t trigger_matches[] = {
 };
 
 /* The ChronoVu LA8/LA16 can have multiple VID/PID pairs. */
-static struct {
+static const struct {
 	uint16_t vid;
 	uint16_t pid;
 	int model;
diff --git a/src/hardware/demo/demo.c b/src/hardware/demo/demo.c
index f3c8bb4a..284396a3 100644
--- a/src/hardware/demo/demo.c
+++ b/src/hardware/demo/demo.c
@@ -168,7 +168,7 @@ static const uint64_t samplerates[] = {
 	SR_HZ(1),
 };
 
-static uint8_t pattern_sigrok[] = {
+static const uint8_t pattern_sigrok[] = {
 	0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
 	0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
 	0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
diff --git a/src/hardware/fluke-dmm/api.c b/src/hardware/fluke-dmm/api.c
index 52bb084a..216c6359 100644
--- a/src/hardware/fluke-dmm/api.c
+++ b/src/hardware/fluke-dmm/api.c
@@ -41,7 +41,7 @@ static const uint32_t devopts[] = {
 
 SR_PRIV struct sr_dev_driver flukedmm_driver_info;
 
-static char *scan_conn[] = {
+static const char *scan_conn[] = {
 	/* 287/289 */
 	"115200/8n1",
 	/* 187/189 */
diff --git a/src/hardware/hameg-hmo/api.c b/src/hardware/hameg-hmo/api.c
index 46db733e..4622ab61 100644
--- a/src/hardware/hameg-hmo/api.c
+++ b/src/hardware/hameg-hmo/api.c
@@ -180,7 +180,7 @@ static int check_channel_group(struct dev_context *devc,
 			     const struct sr_channel_group *cg)
 {
 	unsigned int i;
-	struct scope_config *model;
+	const struct scope_config *model;
 
 	model = devc->model_config;
 
@@ -206,7 +206,7 @@ static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *s
 	int ret, cg_type;
 	unsigned int i;
 	struct dev_context *devc;
-	struct scope_config *model;
+	const struct scope_config *model;
 	struct scope_state *state;
 
 	if (!sdi || !(devc = sdi->priv))
@@ -331,7 +331,7 @@ static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sd
 	unsigned int i, j;
 	char command[MAX_COMMAND_SIZE], float_str[30];
 	struct dev_context *devc;
-	struct scope_config *model;
+	const struct scope_config *model;
 	struct scope_state *state;
 	const char *tmp;
 	uint64_t p, q;
@@ -501,7 +501,7 @@ static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *
 {
 	int cg_type = CG_NONE;
 	struct dev_context *devc = NULL;
-	struct scope_config *model = NULL;
+	const struct scope_config *model = NULL;
 
 	if (sdi && (devc = sdi->priv)) {
 		if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
@@ -572,7 +572,7 @@ SR_PRIV int hmo_request_data(const struct sr_dev_inst *sdi)
 	char command[MAX_COMMAND_SIZE];
 	struct sr_channel *ch;
 	struct dev_context *devc;
-	struct scope_config *model;
+	const struct scope_config *model;
 
 	devc = sdi->priv;
 	model = devc->model_config;
@@ -640,7 +640,7 @@ static int hmo_setup_channels(const struct sr_dev_inst *sdi)
 	gboolean *pod_enabled, setup_changed;
 	char command[MAX_COMMAND_SIZE];
 	struct scope_state *state;
-	struct scope_config *model;
+	const struct scope_config *model;
 	struct sr_channel *ch;
 	struct dev_context *devc;
 	struct sr_scpi_dev_inst *scpi;
diff --git a/src/hardware/hameg-hmo/protocol.c b/src/hardware/hameg-hmo/protocol.c
index 783c3ebc..8c5589bd 100644
--- a/src/hardware/hameg-hmo/protocol.c
+++ b/src/hardware/hameg-hmo/protocol.c
@@ -194,7 +194,7 @@ static const char *scope_digital_channel_names[] = {
 	"D15",
 };
 
-static struct scope_config scope_models[] = {
+static const struct scope_config scope_models[] = {
 	{
 		.name = {"HMO722", "HMO1022", "HMO1522", "HMO2022", NULL},
 		.analog_channels = 2,
@@ -257,7 +257,7 @@ static struct scope_config scope_models[] = {
 	},
 };
 
-static void scope_state_dump(struct scope_config *config,
+static void scope_state_dump(const struct scope_config *config,
 			     struct scope_state *state)
 {
 	unsigned int i;
@@ -326,7 +326,7 @@ static int scope_state_get_array_option(struct sr_scpi_dev_inst *scpi,
 }
 
 static int analog_channel_state_get(struct sr_scpi_dev_inst *scpi,
-				    struct scope_config *config,
+				    const struct scope_config *config,
 				    struct scope_state *state)
 {
 	unsigned int i, j;
@@ -381,7 +381,7 @@ static int analog_channel_state_get(struct sr_scpi_dev_inst *scpi,
 }
 
 static int digital_channel_state_get(struct sr_scpi_dev_inst *scpi,
-				     struct scope_config *config,
+				     const struct scope_config *config,
 				     struct scope_state *state)
 {
 	unsigned int i;
@@ -414,7 +414,7 @@ SR_PRIV int hmo_update_sample_rate(const struct sr_dev_inst *sdi)
 {
 	struct dev_context *devc;
 	struct scope_state *state;
-	struct scope_config *config;
+	const struct scope_config *config;
 
 	int tmp;
 	unsigned int i;
@@ -476,7 +476,7 @@ SR_PRIV int hmo_scope_state_get(struct sr_dev_inst *sdi)
 {
 	struct dev_context *devc;
 	struct scope_state *state;
-	struct scope_config *config;
+	const struct scope_config *config;
 	float tmp_float;
 	unsigned int i;
 
@@ -539,7 +539,7 @@ SR_PRIV int hmo_scope_state_get(struct sr_dev_inst *sdi)
 	return SR_OK;
 }
 
-static struct scope_state *scope_state_new(struct scope_config *config)
+static struct scope_state *scope_state_new(const struct scope_config *config)
 {
 	struct scope_state *state;
 
diff --git a/src/hardware/hameg-hmo/protocol.h b/src/hardware/hameg-hmo/protocol.h
index 5e19ca43..8235b1e7 100644
--- a/src/hardware/hameg-hmo/protocol.h
+++ b/src/hardware/hameg-hmo/protocol.h
@@ -90,7 +90,7 @@ struct scope_state {
 
 /** Private, per-device-instance driver context. */
 struct dev_context {
-	void *model_config;
+	const void *model_config;
 	void *model_state;
 
 	struct sr_channel_group **analog_groups;
diff --git a/src/hardware/ikalogic-scanaplus/api.c b/src/hardware/ikalogic-scanaplus/api.c
index 6e311cbd..37eecbd0 100644
--- a/src/hardware/ikalogic-scanaplus/api.c
+++ b/src/hardware/ikalogic-scanaplus/api.c
@@ -42,7 +42,7 @@ static const char *channel_names[] = {
 };
 
 /* Note: The IKALOGIC ScanaPLUS always samples at 100MHz. */
-static uint64_t samplerates[1] = { SR_MHZ(100) };
+static const uint64_t samplerates[1] = { SR_MHZ(100) };
 
 SR_PRIV struct sr_dev_driver ikalogic_scanaplus_driver_info;
 
diff --git a/src/hardware/manson-hcs-3xxx/api.c b/src/hardware/manson-hcs-3xxx/api.c
index b9e6524b..d3fb8193 100644
--- a/src/hardware/manson-hcs-3xxx/api.c
+++ b/src/hardware/manson-hcs-3xxx/api.c
@@ -52,7 +52,7 @@ static const uint32_t devopts[] = {
 };
 
 /* Note: All models have one power supply output only. */
-static struct hcs_model models[] = {
+static const struct hcs_model models[] = {
 	{ MANSON_HCS_3100, "HCS-3100",     "3100", { 1, 18, 0.1 }, { 0, 10,   0.10 } },
 	{ MANSON_HCS_3102, "HCS-3102",     "3102", { 1, 36, 0.1 }, { 0,  5,   0.01 } },
 	{ MANSON_HCS_3104, "HCS-3104",     "3104", { 1, 60, 0.1 }, { 0,  2.5, 0.01 } },
diff --git a/src/hardware/manson-hcs-3xxx/protocol.h b/src/hardware/manson-hcs-3xxx/protocol.h
index b4441d07..e9035377 100644
--- a/src/hardware/manson-hcs-3xxx/protocol.h
+++ b/src/hardware/manson-hcs-3xxx/protocol.h
@@ -66,7 +66,7 @@ struct hcs_model {
 
 /** Private, per-device-instance driver context. */
 struct dev_context {
-	struct hcs_model *model; /**< Model informaion. */
+	const struct hcs_model *model; /**< Model informaion. */
 
 	uint64_t limit_samples;
 	uint64_t limit_msec;
diff --git a/src/hardware/motech-lps-30x/api.c b/src/hardware/motech-lps-30x/api.c
index c23f84a1..0ed6b09b 100644
--- a/src/hardware/motech-lps-30x/api.c
+++ b/src/hardware/motech-lps-30x/api.c
@@ -88,7 +88,7 @@ static const char *channel_modes[] = {
 	"Track2",
 };
 
-static struct lps_modelspec models[] = {
+static const struct lps_modelspec models[] = {
 	{ LPS_UNKNOWN, "Dummy", 0,
 		{
 
diff --git a/src/hardware/motech-lps-30x/protocol.h b/src/hardware/motech-lps-30x/protocol.h
index 76f646d8..ad7fc070 100644
--- a/src/hardware/motech-lps-30x/protocol.h
+++ b/src/hardware/motech-lps-30x/protocol.h
@@ -95,7 +95,7 @@ struct channel_status {
 /** Private, per-device-instance driver context. */
 struct dev_context {
 	/* Model-specific information */
-	struct lps_modelspec* model;
+	const struct lps_modelspec* model;
 
 	/* Acquisition status */
 	gboolean acq_running;		/**< Aquisition is running. */
diff --git a/src/hardware/scpi-pps/api.c b/src/hardware/scpi-pps/api.c
index 33d94286..9da52579 100644
--- a/src/hardware/scpi-pps/api.c
+++ b/src/hardware/scpi-pps/api.c
@@ -33,7 +33,7 @@ static const uint32_t drvopts[] = {
 	SR_CONF_POWER_SUPPLY,
 };
 
-static struct pps_channel_instance pci[] = {
+static const struct pps_channel_instance pci[] = {
 	{ SR_MQ_VOLTAGE, SCPI_CMD_GET_MEAS_VOLTAGE, "V" },
 	{ SR_MQ_CURRENT, SCPI_CMD_GET_MEAS_CURRENT, "I" },
 	{ SR_MQ_POWER, SCPI_CMD_GET_MEAS_POWER, "P" },
@@ -104,9 +104,9 @@ static struct sr_dev_inst *probe_device(struct sr_scpi_dev_inst *scpi)
 
 	if (device->num_channels) {
 		/* Static channels and groups. */
-		channels = device->channels;
+		channels = (struct channel_spec *)device->channels;
 		num_channels = device->num_channels;
-		channel_groups = device->channel_groups;
+		channel_groups = (struct channel_group_spec *)device->channel_groups;
 		num_channel_groups = device->num_channel_groups;
 	} else {
 		/* Channels and groups need to be probed. */
@@ -419,7 +419,7 @@ static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *
 {
 	struct dev_context *devc;
 	struct sr_channel *ch;
-	struct channel_spec *ch_spec;
+	const struct channel_spec *ch_spec;
 	GVariant *gvar;
 	GVariantBuilder gvb;
 	int ret, i;
diff --git a/src/hardware/scpi-pps/profiles.c b/src/hardware/scpi-pps/profiles.c
index e7d3119a..50d7d93a 100644
--- a/src/hardware/scpi-pps/profiles.c
+++ b/src/hardware/scpi-pps/profiles.c
@@ -63,35 +63,35 @@ static const uint32_t rigol_dp800_devopts_cg[] = {
 	SR_CONF_OUTPUT_ENABLED | SR_CONF_GET | SR_CONF_SET,
 };
 
-struct channel_spec rigol_dp821a_ch[] = {
+const struct channel_spec rigol_dp821a_ch[] = {
 	{ "1", { 0, 60, 0.001 }, { 0, 1, 0.0001 } },
 	{ "2", { 0, 8, 0.001 }, { 0, 10, 0.001 } },
 };
 
-struct channel_spec rigol_dp831_ch[] = {
+const struct channel_spec rigol_dp831_ch[] = {
 	{ "1", { 0, 8, 0.001 }, { 0, 5, 0.0003 } },
 	{ "2", { 0, 30, 0.001 }, { 0, 2, 0.0001 } },
 	{ "3", { 0, -30, 0.001 }, { 0, 2, 0.0001 } },
 };
 
-struct channel_spec rigol_dp832_ch[] = {
+const struct channel_spec rigol_dp832_ch[] = {
 	{ "1", { 0, 30, 0.001 }, { 0, 3, 0.001 } },
 	{ "2", { 0, 30, 0.001 }, { 0, 3, 0.001 } },
 	{ "3", { 0, 5, 0.001 }, { 0, 3, 0.001 } },
 };
 
-struct channel_group_spec rigol_dp820_cg[] = {
+const struct channel_group_spec rigol_dp820_cg[] = {
 	{ "1", CH_IDX(0), PPS_OVP | PPS_OCP },
 	{ "2", CH_IDX(1), PPS_OVP | PPS_OCP },
 };
 
-struct channel_group_spec rigol_dp830_cg[] = {
+const struct channel_group_spec rigol_dp830_cg[] = {
 	{ "1", CH_IDX(0), PPS_OVP | PPS_OCP },
 	{ "2", CH_IDX(1), PPS_OVP | PPS_OCP },
 	{ "3", CH_IDX(2), PPS_OVP | PPS_OCP },
 };
 
-struct scpi_command rigol_dp800_cmd[] = {
+const struct scpi_command rigol_dp800_cmd[] = {
 	{ SCPI_CMD_REMOTE, "SYST:REMOTE" },
 	{ SCPI_CMD_LOCAL, "SYST:LOCAL" },
 	{ SCPI_CMD_BEEPER, "SYST:BEEP:STAT?" },
@@ -136,15 +136,15 @@ static const uint32_t hp_6632b_devopts[] = {
 	SR_CONF_OUTPUT_CURRENT_LIMIT | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
 };
 
-struct channel_spec hp_6632b_ch[] = {
+const struct channel_spec hp_6632b_ch[] = {
 	{ "1", { 0, 20.475, 0.005 }, { 0, 5.1188, 0.00132 } },
 };
 
-struct channel_group_spec hp_6632b_cg[] = {
+const struct channel_group_spec hp_6632b_cg[] = {
 	{ "1", CH_IDX(0), 0 },
 };
 
-struct scpi_command hp_6632b_cmd[] = {
+const struct scpi_command hp_6632b_cmd[] = {
 	{ SCPI_CMD_GET_OUTPUT_ENABLED, "OUTP:STAT?" },
 	{ SCPI_CMD_SET_OUTPUT_ENABLE, "OUTP:STAT ON" },
 	{ SCPI_CMD_SET_OUTPUT_DISABLE, "OUTP:STAT OFF" },
@@ -183,7 +183,7 @@ enum philips_pm2800_modules {
 	PM2800_MOD_120V_1A,
 };
 
-static struct philips_pm2800_module_spec {
+static const struct philips_pm2800_module_spec {
 	/* Min, max, programming resolution. */
 	float voltage[3];
 	float current[3];
@@ -198,7 +198,7 @@ static struct philips_pm2800_module_spec {
 	[PM2800_MOD_120V_1A] = { { 0, 120, 0.030 }, { -1, 1, 0.00025 } },
 };
 
-static struct philips_pm2800_model {
+static const struct philips_pm2800_model {
 	unsigned int chassis;
 	unsigned int num_modules;
 	unsigned int set;
@@ -226,15 +226,15 @@ static struct philips_pm2800_model {
 	{ 3, 2, 3, { PM2800_MOD_8V_15A, PM2800_MOD_8V_15A, 0 } },
 };
 
-static char *philips_pm2800_names[] = { "1", "2", "3" };
+static const char *philips_pm2800_names[] = { "1", "2", "3" };
 
 static int philips_pm2800_probe_channels(struct sr_dev_inst *sdi,
 		struct sr_scpi_hw_info *hw_info,
 		struct channel_spec **channels, unsigned int *num_channels,
 		struct channel_group_spec **channel_groups, unsigned int *num_channel_groups)
 {
-	struct philips_pm2800_model *model;
-	struct philips_pm2800_module_spec *spec;
+	const struct philips_pm2800_model *model;
+	const struct philips_pm2800_module_spec *spec;
 	unsigned int chassis, num_modules, set, module, m, i;
 
 	(void)sdi;
@@ -270,9 +270,9 @@ static int philips_pm2800_probe_channels(struct sr_dev_inst *sdi,
 		sr_dbg("output %d: %.0f - %.0fV, %.0f - %.0fA", i + 1,
 				spec->voltage[0], spec->voltage[1],
 				spec->current[0], spec->current[1]);
-		(*channels)[i].name = philips_pm2800_names[i];
+		(*channels)[i].name = (char *)philips_pm2800_names[i];
 		memcpy(&((*channels)[i].voltage), spec, sizeof(float) * 6);
-		(*channel_groups)[i].name = philips_pm2800_names[i];
+		(*channel_groups)[i].name = (char *)philips_pm2800_names[i];
 		(*channel_groups)[i].channel_index_mask = 1 << i;
 		(*channel_groups)[i].features = PPS_OTP | PPS_OVP | PPS_OCP;
 	}
@@ -281,7 +281,7 @@ static int philips_pm2800_probe_channels(struct sr_dev_inst *sdi,
 	return SR_OK;
 }
 
-struct scpi_command philips_pm2800_cmd[] = {
+const struct scpi_command philips_pm2800_cmd[] = {
 	{ SCPI_CMD_SELECT_CHANNEL, ":INST:NSEL %s" },
 	{ SCPI_CMD_GET_MEAS_VOLTAGE, ":MEAS:VOLT?" },
 	{ SCPI_CMD_GET_MEAS_CURRENT, ":MEAS:CURR?" },
diff --git a/src/hardware/scpi-pps/protocol.c b/src/hardware/scpi-pps/protocol.c
index 86ec3876..be478860 100644
--- a/src/hardware/scpi-pps/protocol.c
+++ b/src/hardware/scpi-pps/protocol.c
@@ -21,11 +21,11 @@
 #include <stdarg.h>
 #include "protocol.h"
 
-SR_PRIV char *scpi_cmd_get(const struct sr_dev_inst *sdi, int command)
+SR_PRIV const char *scpi_cmd_get(const struct sr_dev_inst *sdi, int command)
 {
 	struct dev_context *devc;
 	unsigned int i;
-	char *cmd;
+	const char *cmd;
 
 	devc = sdi->priv;
 	cmd = NULL;
@@ -44,7 +44,7 @@ SR_PRIV int scpi_cmd(const struct sr_dev_inst *sdi, int command, ...)
 	struct sr_scpi_dev_inst *scpi;
 	va_list args;
 	int ret;
-	char *cmd;
+	const char *cmd;
 
 	if (!(cmd = scpi_cmd_get(sdi, command))) {
 		/* Device does not implement this command, that's OK. */
@@ -66,7 +66,8 @@ SR_PRIV int scpi_cmd_resp(const struct sr_dev_inst *sdi, GVariant **gvar,
 	va_list args;
 	double d;
 	int ret;
-	char *cmd, *s;
+	char *s;
+	const char *cmd;
 
 	if (!(cmd = scpi_cmd_get(sdi, command))) {
 		/* Device does not implement this command, that's OK. */
diff --git a/src/hardware/scpi-pps/protocol.h b/src/hardware/scpi-pps/protocol.h
index 7a06093f..bd0dc933 100644
--- a/src/hardware/scpi-pps/protocol.h
+++ b/src/hardware/scpi-pps/protocol.h
@@ -77,18 +77,18 @@ enum pps_features {
 };
 
 struct scpi_pps {
-	char *vendor;
-	char *model;
+	const char *vendor;
+	const char *model;
 	uint64_t features;
 	const uint32_t *devopts;
 	unsigned int num_devopts;
 	const uint32_t *devopts_cg;
 	unsigned int num_devopts_cg;
-	struct channel_spec *channels;
+	const struct channel_spec *channels;
 	unsigned int num_channels;
-	struct channel_group_spec *channel_groups;
+	const struct channel_group_spec *channel_groups;
 	unsigned int num_channel_groups;
-	struct scpi_command *commands;
+	const struct scpi_command *commands;
 	unsigned int num_commands;
 	int (*probe_channels) (struct sr_dev_inst *sdi, struct sr_scpi_hw_info *hwinfo,
 		struct channel_spec **channels, unsigned int *num_channels,
@@ -96,7 +96,7 @@ struct scpi_pps {
 };
 
 struct channel_spec {
-	char *name;
+	const char *name;
 	/* Min, max, programming resolution. */
 	float voltage[3];
 	float current[3];
@@ -104,11 +104,11 @@ struct channel_spec {
 
 struct scpi_command {
 	int command;
-	char *string;
+	const char *string;
 };
 
 struct channel_group_spec {
-	char *name;
+	const char *name;
 	uint64_t channel_index_mask;
 	uint64_t features;
 };
@@ -116,13 +116,13 @@ struct channel_group_spec {
 struct pps_channel {
 	int mq;
 	unsigned int hw_output_idx;
-	char *hwname;
+	const char *hwname;
 };
 
 struct pps_channel_instance {
 	int mq;
 	int command;
-	char *prefix;
+	const char *prefix;
 };
 
 struct pps_channel_group {
@@ -153,7 +153,7 @@ struct dev_context {
 };
 
 const char *get_vendor(const char *raw_vendor);
-SR_PRIV char *scpi_cmd_get(const struct sr_dev_inst *sdi, int command);
+SR_PRIV const char *scpi_cmd_get(const struct sr_dev_inst *sdi, int command);
 SR_PRIV int scpi_cmd(const struct sr_dev_inst *sdi, int command, ...);
 SR_PRIV int scpi_cmd_resp(const struct sr_dev_inst *sdi, GVariant **gvar,
 		const GVariantType *gvtype, int command, ...);
diff --git a/src/hardware/serial-dmm/api.c b/src/hardware/serial-dmm/api.c
index 08099753..ecaba493 100644
--- a/src/hardware/serial-dmm/api.c
+++ b/src/hardware/serial-dmm/api.c
@@ -280,7 +280,7 @@ static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 		REQUEST, VALID, PARSE, DETAILS, sizeof(struct CHIPSET##_info) \
 	}
 
-SR_PRIV struct dmm_info *serial_dmm_drivers[] = {
+SR_PRIV const struct dmm_info *serial_dmm_drivers[] = {
 	DMM(
 		"bbcgm-2010", metex14,
 		"BBC Goertz Metrawatt", "M2110", "1200/7n2", 1200,
diff --git a/src/hardware/testo/api.c b/src/hardware/testo/api.c
index da6d171a..103f44ce 100644
--- a/src/hardware/testo/api.c
+++ b/src/hardware/testo/api.c
@@ -36,8 +36,9 @@ static const uint32_t devopts[] = {
 	SR_CONF_LIMIT_MSEC | SR_CONF_SET,
 };
 
-unsigned char TESTO_x35_REQUEST[] = { 0x12, 0, 0, 0, 1, 1, 0x55, 0xd1, 0xb7 };
-struct testo_model models[] = {
+static const uint8_t TESTO_x35_REQUEST[] = { 0x12, 0, 0, 0, 1, 1, 0x55, 0xd1, 0xb7 };
+
+static const struct testo_model models[] = {
 	{ "435", 9, TESTO_x35_REQUEST },
 };
 
diff --git a/src/hardware/testo/protocol.c b/src/hardware/testo/protocol.c
index 15717c02..46e9ae62 100644
--- a/src/hardware/testo/protocol.c
+++ b/src/hardware/testo/protocol.c
@@ -76,7 +76,7 @@ SR_PRIV int testo_probe_channels(struct sr_dev_inst *sdi)
 		libusb_bulk_transfer(usb->devhdl, EP_IN, buf, MAX_REPLY_SIZE, &len, 10);
 	} while (len > 2);
 
-	if (libusb_bulk_transfer(usb->devhdl, EP_OUT, devc->model->request,
+	if (libusb_bulk_transfer(usb->devhdl, EP_OUT, (unsigned char *)devc->model->request,
 			devc->model->request_size, &devc->reply_size, 10) < 0)
 		return SR_ERR;
 
@@ -153,7 +153,7 @@ SR_PRIV int testo_request_packet(const struct sr_dev_inst *sdi)
 	usb = sdi->conn;
 
 	libusb_fill_bulk_transfer(devc->out_transfer, usb->devhdl, EP_OUT,
-			devc->model->request, devc->model->request_size,
+			(unsigned char *)devc->model->request, devc->model->request_size,
 			receive_transfer, (void *)sdi, 100);
 	if ((ret = libusb_submit_transfer(devc->out_transfer) != 0)) {
 		sr_err("Failed to request packet: %s.", libusb_error_name(ret));
diff --git a/src/hardware/testo/protocol.h b/src/hardware/testo/protocol.h
index a61a9dce..c2c3a870 100644
--- a/src/hardware/testo/protocol.h
+++ b/src/hardware/testo/protocol.h
@@ -48,13 +48,13 @@
 struct testo_model {
 	char *name;
 	int request_size;
-	unsigned char *request;
+	const uint8_t *request;
 };
 
 /** Private, per-device-instance driver context. */
 struct dev_context {
 	/* Model-specific information */
-	struct testo_model *model;
+	const struct testo_model *model;
 
 	/* Acquisition settings */
 	uint64_t limit_msec;
@@ -69,7 +69,7 @@ struct dev_context {
 
 	/* Temporary state across callbacks */
 	struct libusb_transfer *out_transfer;
-	unsigned char reply[MAX_REPLY_SIZE];
+	uint8_t reply[MAX_REPLY_SIZE];
 	int reply_size;
 };
 
@@ -77,7 +77,7 @@ SR_PRIV int testo_set_serial_params(struct sr_usb_dev_inst *usb);
 SR_PRIV int testo_probe_channels(struct sr_dev_inst *sdi);
 SR_PRIV void receive_transfer(struct libusb_transfer *transfer);
 SR_PRIV int testo_request_packet(const struct sr_dev_inst *sdi);
-SR_PRIV gboolean testo_check_packet_prefix(unsigned char *buf, int len);
+SR_PRIV gboolean testo_check_packet_prefix(uint8_t *buf, int len);
 SR_PRIV uint16_t crc16_mcrf4xx(uint16_t crc, uint8_t *data, size_t len);
 SR_PRIV void testo_receive_packet(const struct sr_dev_inst *sdi);
 
diff --git a/src/hardware/uni-t-dmm/api.c b/src/hardware/uni-t-dmm/api.c
index e964279d..0f872735 100644
--- a/src/hardware/uni-t-dmm/api.c
+++ b/src/hardware/uni-t-dmm/api.c
@@ -61,7 +61,7 @@ SR_PRIV struct sr_dev_driver voltcraft_vc960_driver_info;
 SR_PRIV struct sr_dev_driver tenma_72_7745_driver_info;
 SR_PRIV struct sr_dev_driver tenma_72_7750_driver_info;
 
-SR_PRIV struct dmm_info udmms[] = {
+SR_PRIV const struct dmm_info udmms[] = {
 	{
 		"Tecpel", "DMM-8061", 2400,
 		FS9721_PACKET_SIZE,
diff --git a/src/hardware/uni-t-dmm/protocol.c b/src/hardware/uni-t-dmm/protocol.c
index 28bfc096..c60acb70 100644
--- a/src/hardware/uni-t-dmm/protocol.c
+++ b/src/hardware/uni-t-dmm/protocol.c
@@ -24,7 +24,7 @@
 #include "libsigrok-internal.h"
 #include "protocol.h"
 
-extern struct dmm_info udmms[];
+extern const struct dmm_info udmms[];
 
 /*
  * Driver for various UNI-T multimeters (and rebranded ones).
diff --git a/src/hardware/yokogawa-dlm/api.c b/src/hardware/yokogawa-dlm/api.c
index 054d431d..fcc84e1b 100644
--- a/src/hardware/yokogawa-dlm/api.c
+++ b/src/hardware/yokogawa-dlm/api.c
@@ -23,8 +23,8 @@
 
 SR_PRIV struct sr_dev_driver yokogawa_dlm_driver_info;
 
-static char *MANUFACTURER_ID = "YOKOGAWA";
-static char *MANUFACTURER_NAME = "Yokogawa";
+static const char *MANUFACTURER_ID = "YOKOGAWA";
+static const char *MANUFACTURER_NAME = "Yokogawa";
 
 static const uint32_t drvopts[] = {
 	SR_CONF_LOGIC_ANALYZER,
@@ -178,7 +178,7 @@ static int check_channel_group(struct dev_context *devc,
 			const struct sr_channel_group *cg)
 {
 	unsigned int i;
-	struct scope_config *model;
+	const struct scope_config *model;
 
 	model = devc->model_config;
 
@@ -203,7 +203,7 @@ static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *s
 	int ret, cg_type;
 	unsigned int i;
 	struct dev_context *devc;
-	struct scope_config *model;
+	const struct scope_config *model;
 	struct scope_state *state;
 
 	if (!sdi || !(devc = sdi->priv))
@@ -322,7 +322,7 @@ static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sd
 	unsigned int i, j;
 	char float_str[30];
 	struct dev_context *devc;
-	struct scope_config *model;
+	const struct scope_config *model;
 	struct scope_state *state;
 	const char *tmp;
 	uint64_t p, q;
@@ -474,7 +474,7 @@ static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *
 {
 	int cg_type = CG_NONE;
 	struct dev_context *devc = NULL;
-	struct scope_config *model = NULL;
+	const struct scope_config *model = NULL;
 
 	if (sdi && (devc = sdi->priv)) {
 		if ((cg_type = check_channel_group(devc, cg)) == CG_INVALID)
@@ -572,7 +572,7 @@ static int dlm_setup_channels(const struct sr_dev_inst *sdi)
 	unsigned int i;
 	gboolean *pod_enabled, setup_changed;
 	struct scope_state *state;
-	struct scope_config *model;
+	const struct scope_config *model;
 	struct sr_channel *ch;
 	struct dev_context *devc;
 	struct sr_scpi_dev_inst *scpi;
diff --git a/src/hardware/yokogawa-dlm/protocol.c b/src/hardware/yokogawa-dlm/protocol.c
index 8acaf023..975bfcb8 100644
--- a/src/hardware/yokogawa-dlm/protocol.c
+++ b/src/hardware/yokogawa-dlm/protocol.c
@@ -168,7 +168,7 @@ static const char *scope_digital_channel_names[] = {
 	"D7"
 };
 
-static struct scope_config scope_models[] = {
+static const struct scope_config scope_models[] = {
 	{
 		.model_id   = {"710105",  "710115",  "710125",  NULL},
 		.model_name = {"DLM2022", "DLM2032", "DLM2052", NULL},
@@ -235,7 +235,7 @@ static struct scope_config scope_models[] = {
  * @param config This is the scope configuration.
  * @param state The current scope state to print.
  */
-static void scope_state_dump(struct scope_config *config,
+static void scope_state_dump(const struct scope_config *config,
 		struct scope_state *state)
 {
 	unsigned int i;
@@ -376,7 +376,7 @@ static int array_float_get(gchar *value, const uint64_t array[][2],
  * @return SR_ERR on error, SR_OK otherwise.
  */
 static int analog_channel_state_get(struct sr_scpi_dev_inst *scpi,
-		struct scope_config *config,
+		const struct scope_config *config,
 		struct scope_state *state)
 {
 	int i, j;
@@ -439,7 +439,7 @@ static int analog_channel_state_get(struct sr_scpi_dev_inst *scpi,
  * @return SR_ERR on error, SR_OK otherwise.
  */
 static int digital_channel_state_get(struct sr_scpi_dev_inst *scpi,
-		struct scope_config *config,
+		const struct scope_config *config,
 		struct scope_state *state)
 {
 	unsigned int i;
@@ -514,7 +514,7 @@ SR_PRIV int dlm_scope_state_query(struct sr_dev_inst *sdi)
 {
 	struct dev_context *devc;
 	struct scope_state *state;
-	struct scope_config *config;
+	const struct scope_config *config;
 	float tmp_float;
 	gchar *response;
 	int i;
@@ -588,7 +588,7 @@ SR_PRIV int dlm_scope_state_query(struct sr_dev_inst *sdi)
  *
  * @return The newly allocated scope_state struct.
  */
-static struct scope_state *dlm_scope_state_new(struct scope_config *config)
+static struct scope_state *dlm_scope_state_new(const struct scope_config *config)
 {
 	struct scope_state *state;
 
diff --git a/src/hardware/yokogawa-dlm/protocol.h b/src/hardware/yokogawa-dlm/protocol.h
index aa62f321..0bdb7f2f 100644
--- a/src/hardware/yokogawa-dlm/protocol.h
+++ b/src/hardware/yokogawa-dlm/protocol.h
@@ -105,7 +105,7 @@ struct scope_state {
 
 /** Private, per-device-instance driver context. */
 struct dev_context {
-	void *model_config;
+	const void *model_config;
 	void *model_state;
 
 	struct sr_channel_group **analog_groups;
diff --git a/src/input/csv.c b/src/input/csv.c
index 47fee73e..0e68e391 100644
--- a/src/input/csv.c
+++ b/src/input/csv.c
@@ -454,9 +454,9 @@ static int init(struct sr_input *in, GHashTable *options)
 	return SR_OK;
 }
 
-static char *get_line_termination(GString *buf)
+static const char *get_line_termination(GString *buf)
 {
-	char *term;
+	const char *term;
 
 	term = NULL;
 	if (g_strstr_len(buf->str, buf->len, "\r\n"))
@@ -581,7 +581,8 @@ static int initial_receive(const struct sr_input *in)
 	struct context *inc;
 	GString *new_buf;
 	int len, ret;
-	char *termination, *p;
+	char *p;
+	const char *termination;
 
 	inc = in->priv;
 
diff --git a/src/scpi/scpi_serial.c b/src/scpi/scpi_serial.c
index 650f9711..7f039bf0 100644
--- a/src/scpi/scpi_serial.c
+++ b/src/scpi/scpi_serial.c
@@ -36,7 +36,7 @@ struct scpi_serial {
 	size_t read;
 };
 
-static struct {
+static const struct {
 	uint16_t vendor_id;
 	uint16_t product_id;
 	const char *serialcomm;